Guiding system for milling machine mouldboard

Description

Technical field

[0001] The present invention concerns a guiding system for milling machine mouldboard designed to leave the milled material in a high layer on the milled surface and in particular for a milling machine for asphalt, concrete and other materials used for road pavings according to the characteristics of the pre-characterizing part of claim 1.

[0002] The present invention also concerns a milling machine provided with such guiding system according to the characteristics of the pre-characterizing part of claim 11.

Prior art

[0003] A road milling machine is a self-propelled machine, of known technology, finalized to the demotition of road pavings by means of milling with a rotating milling drum. A road milling machine (Figs. 1, 2) is generally equipped with a milling drum (3) contained in a milling drum housing (7) opened downwardly to ensure the contact of said milling drum (3) with the surface to be milled and frontally opened for the outflow of the milled material outside the milling drum housing (7) itself.

[0004] The rear part of the milling drum housing (7) is closed by a rear mouldboard (8) generally made (Fig. 4) of an upper section (12) and of a lower section (13).

[0005] The upper section (12) is hinged at the hinging point (29) and it can rotate (Figs. 4, 6, 7, 8) around a horizontal axis, parallel to the rotating axis of the milling drum (3), the rotation being generally operated by two mouldboard operating pistons (24), which in the illustrated embodiment are two hydraulic pistons.

[0006] The lower section (13) slides over the upper section (12), being engaged to this by means (Fig. 3) of two slot guides (15). Moreover, the lower section (13) is also guided (Figs. 3, 4, 6, 7) by two cam-profiles (16) fitted on the first side wall (26) and second side wall (27) of the milling drum housing (7). Said cam-profiles (16) force the mouldboard lower section (13) to move vertically for a certain distance. Then the lower section (13) is disengaged from the lateral cam-profiles (16) and it rotates along with the upper section (12), both vertical and rotating movements being supported by said two mouldboard operating pistons (24).

[0007] The lower section (13) of the rear mouldboard (8) is provided with scraping tools (20) and it is generally in contact with the milled surface, being forced downwards by a controlled pressure of mouldboard operating pistons (24) and acting as a scraper to clean the milled surface.

[0008] The rear mouldboard (8) is generally opened, when the machine is stopped, to get the access to the milling tools for their replacement.

[0009] In normal milling operations the rear mouldboard (8) is in contact with the milled surface and contributes to transfer the milled material from the milling drum housing (7) onto (Figs. 1, 2) a conveyor system (30), which in the illustrated embodiment comprises a collecting conveyor (5) and a loading conveyor (6).

[0010] In some works the milled material (23) must be left (Figs. 6, 7, 11) on the milled surface, for example for the so-called "in situ" recycling of the milled material (23). In this situation the normal operating practice consists of:

• stopping the collecting conveyor (5) or, in general, the conveyor system (30);
• lifting the lower section (13) of the rear mouldboard (8) to such a height as to allow (Figs. 6, 7) the free flow of the milled material (23) underneath the rear mouldboard (8).

DE3528038 describes a machine for cutting road surfaces, with an undercarriage having its own drive and with a cutting device arranged on it. Behind the cutting device a material-collecting flap is present which is fastened to the undercarriage so as to be vertically adjustable by means of two lateral coaxial bearing journals, each of which engages into a groove in a bearing cheek.
EP2025812 describes a scraper device having a scraper blade engaged with lateral retaining devices at lateral walls. A swiveling device swivels scraper blade about swiveling axis when the scraper blade is disengaged from lateral retaining devices.
EP0685598 describes a milling machine including a floating mould board for directing milled material onto a loading device. The mould board is pivotable about a horizontal axis at the top stop position, to expose a milling roller for repairs. When the machine is in operation the mould board is hydraulically supported to permit the mould board to float along the milled surface.
EP0752501 describes a road excavator equipped with a rotary cutter and a collector having a casing with a discharge port and a helical screw gathering the excavated material. The excavator includes a pair of hydraulic cylinders for adjusting the vertical position of the collector.

Problems of the prior art

[0011] In a prior art milling machine the vertical run of the lower section (13) of the rear mouldboard (8) is designed to leave an underneath clearance of about 200 mm. which allows the free flow of milled material (23) resulting from a milling depth of about 150 mm. or less. This represents a work limit, particularly in the "in situ" asphalt pavement recycling technology, where a milling depth of 200 mm or more, is often required.

[0012] Moreover, in the prior art milling machines, when a milling depth higher than about 150 mm is required, it is necessary to fully rotate the rear mouldboard (8) upwards with the following disadvantages:

• possible access of the workers to a very dangerous area.
• inefficient containment of the milled material, which can be spread around by the milling drum (3) rotation.

Aim of the invention

[0013] The invention has the following aims:

• to increase the vertical run of the lower section (13) of the rear mouldboard (8) as much as possible;
• to allow a fast full opening of the rear mouldboard (8) up to an engagement safety position.

Advantageous effects of the invention

[0014] The solution according to the present invention presents many advantages, by the considerable creative contribution the effect of which constitutes an immediate and not negligible technical progress.

[0015] One of the advantageous effects of the present invention is due to the fact that the increasing of the vertical run of the lower section (13) is achieved by means of an adaption system which allows the use of the present invention also on the machines of the prior art.

[0016] Furthermore, with reference to the application to the prior art machines, the present invention does not require any modification of the design of the drum housing (7)

Description of a preferred embodiment of the milling machine

[0017] An embodiment of the invention is now described with reference to the accompanying drawings in which:

Fig. 1 represents a side view of a milling machine.

Fig. 2 represents a side view of the milling machine of Fig. 1, partially in section to show some of the internal components.

Fig.3 represents an overall view of a typical rear mouldboard according to the prior art.

Fig. 4 represents a side sectional view of a typical rear mouldboard at one of the possible different opening stages.

Fig. 5 represents a side view of the cam-profile device of Fig. 4.

Fig. 6 represents a side sectional view of a typical rear mouldboard at one of the possible different opening stages

Fig. 7 represents a side sectional view of a typical rear mouldboard at one of the possible different opening stages.

Fig. 8 represents a side sectional view of a typical rear mouldboard at one of the possible different opening stages.

Fig. 9 represents a side sectional view of the rear mouldboard according to the present invention at one of the possible different opening stages.

Fig. 10 represents a side view of the cam-profile device and of the auxiliary block of Fig. 9.

Fig. 11 represents a side sectional view of the rear mouldboard according to the present invention at one of the possible different opening stages.

Fig. 12 represents a view of one of the auxiliary blocks according to the present invention.

Fig. 13, 14, 15 represent side views illustrating the insertion of one of the auxiliary blocks of Fig. 12 according to the present invention.

Detailed description of the milling machine with reference to the drawings

[0018] Because of the deterioration of the road pavement due to atmospheric causes and to the traffic load, the periodical renewal of the same is necessary. For such renewal operation the removal of the old pavement is generally required.

[0019] The milling machines answer this need, being machines specially conceived for the removal of the old pavement before the laying of the new mat. The road milling machine (Figs. 1, 2) consists of a self-propelled chassis (1) supported on tracks (2), or wheels, generally equipped with hydraulic drives that pull power from an engine, which is usually a diesel engine. The milling drum (3) is supported by the chassis (1), transversely to the advancement direction (14) of the machine and is activated by the engine through a mechanical transmission, or by a hydraulic transmission. The tracks (2), or wheels, are connected to telescopic columns (4), by means of which the chassis (1) is brought to height and set to obtain the correct milling profile. The material milled by the milling drum (3) is removed from the milling drum housing (7) by means of a conveyor system (30) consisting of one or two conveyors (5, 6) and it can be discharged at the forepart of the machine or at its back. In the first case the material is discharged on means of transportation that precedes the milling machine, while in the second case the means of transportation fellows the milling machine proceeding in reverse motion.

[0020] The description of the invention refers to its application on a road milling machine with frontal charge of known technology (Figs. 1, 2), in which the milling drum (3) is contained in a drum housing (7). Referring to the advancement direction (14) during operation, the drum housing (7) is provided with a movable rear mouldboard (8), provided with scraping tools (20) for the cleaning of the milled surface, and it is also provided with two movable side plates (9, 10) in contact with the road surface, with floating or slightly forced action.

[0021] However, it will be apparent to one skilled in the art that the invention, object of the present application, is also applicable to milling machines with rear discharging.

[0022] In the forepart of the milling drum housing (7) an opening (28) is provided (Fig. 2), which allows the discharging of the milled material onto a first conveyor belt, which is generally identified as the collecting conveyor (5). The rear part of said collecting conveyor (5) is supported by a device commonly known with the name of pressure bar (11), which is generally kept in a more or less forced contact condition with the surface to be milled, and the forepart of which slides on a support connected to the chassis (1) of the machine. The collecting conveyor (5) discharges the milled material onto a loading conveyor (6) which can be slewed vertically and horizontally to adapt its discharge head to the height and position of the transport vehicle, changing the position of the discharge point (25) with respect to the position of the chassis (1) of the machine. So, in general, the machine is equipped with a conveyor system (30) comprising at least one conveyor.

[0023] The rear mouldboard (8) is divided (Fig. 3) into two sections, a lower section (13) and an upper section (12). The lower section (13) can be vertically moved and the upper section (12) can rotate (Figs. 4, 6, 7), along with the lower section (13), around a horizontal axis at a hinging point (29). The vertical movement of the lower section (13) allows maintaining the lower section (13) of the rear mouldboard (8) in contact with the milled surface with a floating or forced action, but for particular operative needs the rear mouldboard (8) may be also held partially raised to leave the milled material (23) flow below it.

[0024] The lower edge of the rear mouldboard (8) is provided with scraping tools (20) to clean the milled surface. The rotary motion around the hinging point (29) with a horizontal axis allows the total opening of the rear mouldboard (8) to access the tools of the milling drum (3) for their replacement.

[0025] The total opening/closing operation of the rear mouldboard (8) is performed by two mouldboard operating pistons (24) which are arranged in a parallel way. It will be apparent that depending on the dimensions of the rear mouldboard (8) and on the particular application single central operating piston could be used, the solution with two operating pistons (24) being the preferred one. When the rear mouldboard (8) is in the fully opened condition, the rear mouldboard (8) can be secured in position (Fig. 8) by means of a hook (22) which can be engaged with a retainer (21).

[0026] The sequence of the opening phase of the rear mouldboard (8) occurs due to the combined action of:

• the vertical slot guides (15), which allow the lower section (13) to vertically slide over the upper section (12) in contact with the same;
• the lateral cam-profiles (16) kept in contact with some cursors (17), which are integral with the rear mouldboard (8) and which form the contact element sliding on said cam-profiles (16).

[0027] In the first stage (Fig. 4, 6) of the opening phase the lateral cursors (17) slide against (Fig. 5) the first surface (31) and the second surface (32) of the cam-profiles (16) and the lower part (13) of the rear mouldboard (8) moves in a vertical direction. When cursors (17) start to slide over the third surface (33) of the cam-profile (16), both the lower section (13) and the upper section (12) of the rear mouldboard (8) start to rotate as a single piece (Fig. 7).

[0028] During the run of the cursor (17) over the first surface (31) and the second surface (32), the thrust of the milled material (23) against the mouldboard (8) is supported by the lateral cam-profiles (16), but this does not happen along the run on the third surface (33). In this stage the thrust of the milled material contributes to the full opening of the mouldboard.

[0029] In the traditional machine the vertical run of the rear mouldboard (8) is limited to about 200 mm. which gives enough clearance for the flow of milled material (23) resulting from a milling depth of about 150 mm. For higher milling depth it would be necessary to fully rotate the rear mouldboard (8) upwards with the following disadvantages:

• possible access of the workers to a very dangerous area.
• inefficient containment of the milled material, which can be spread around by the drum rotation.

[0030] In practice for a safe work of the rear mouldboard (8), the scraping tools (20) should be kept in contact with the milled material (23) at any time.

[0031] The present invention (Figs. 9, 10, 11) has solved the above mentioned problems of the prior art machines. Special auxiliary blocks (18) are fitted to the first side wall (26) and to the second side wall (27) of the milling drum housing (7).

[0032] In the illustrated preferred embodiment (Fig. 12), the auxiliary blocks (18) are shaped as a right-angle triangularly shaped body in which the hypotenuse (Figs. 9, 10) essentially constitutes a by-pass fourth surface (34) which allows to by-pass the third surface (33) of the lateral cam-profiles (16) during the movement of the lower section (13) of the rear mouldboard (8). One of the right-angled sides of the right-angle triangularly shaped body of the auxiliary block (18) goes in an abutment condition with the third surface (33) of the lateral cam-profiles (16), contributing to the release of the force applied to the auxiliary blocks (18) by the lower section (13) through the cursor (17).

[0033] The by-pass fourth surface (34) of the auxiliary blocks (18) forms an extension of the second surfaces (32) preventing the cursors (17) from sliding on the third surface (33) and guiding the movement of the cursors (17) in a vertical direction, thus preventing the rear mouldboard (8) from rotating around the hinging point (29) and causing the rear mouldboard (8) to further move in the vertical direction without starting to rotate around the hinging point (29). In this way the vertical stroke of the rear mouldboard (8) is extended. Thus an increased flow of the milled material (23) under the scraping tools (20) is allowed when the cutting depth is about 200 mm or more.

[0034] In this way the rear mouldboard (8) can be kept in a working position also when the cutting depth is about 200 mm or more, thus preventing the possible access of the workers to a very dangerous area and avoiding the inefficient containment of the milled material, which, otherwise, could be spread around by the milling drum (3) rotation.

[0035] The auxiliary blocks (18) are connected to the first side wall (26) and to the second side wall (27) of the milling drum housing (7) by means of a quick fastening system (19), which allows the auxiliary blocks (18) to be rapidly and easily removed to restore the full rotation condition of the mouldboard (8) in order to allow the access to the milling drum housing (7) only in case safety conditions are ensured.

[0036] The auxiliary blocks (18) provide means to extend the stroke of the lower section (13) of the rear mouldboard (8), vertically extending the length of the lateral cam-profile guides (16).

[0037] The auxiliary blocks (18) are quickly removable to allow the full opening of the rear mouldboard (8) up to the engagement of the safety hook (22) with the retainer (21).

[0038] In the illustrated preferred embodiment (Fig. 12), the quick fastening system (19) consists of a spacer (39) supporting a head (40). Each of the auxiliary blocks (18) is provided with two spaced fastening systems (19).

[0039] On the first side wall (26) and on the second side wall (27) of the milling drum housing (7) a couple (Fig. 13) of corresponding slotted holes (36) is obtained, each of said slotted holes (36) consisting of an enlarged portion (37) and a slotted portion (38). The axis of the slotted portion (38) of one of the slotted holes (36) is parallel to the axis of the slotted portion (38) of the other one of the slotted holes (36) of said couple of slotted holes (36).

[0040] The auxiliary block (18) is placed (Fig. 14) in correspondence with said slotted holes (36), with the heads (40) of the quick fastening system (19), which are positioned in correspondence of the enlarged portion (37) of the corresponding slotted hole (36). After inserting each of the heads (40) into the corresponding enlarged portion (37), the auxiliary block (18) is pulled backward (in the direction indicated by the arrow in Fig. 14) causing the spacer (39) to be inserted and to slide along the slotted portion (38) until the head (40) is prevented to exit from the corresponding enlarged portion (37) of the slotted hole (36).

[0041] At this point (Fig. 15) the lower section (13) of the rear mouldboard (8) is raised (in the direction indicated by the arrow in Fig. 15): the cursor (17) is prevented to slide on the third surface (33) of the cam-profile (16) and it slides on the by-pass fourth surface (34) of the auxiliary blocks (18), blocking in position the auxiliary block (18) and preventing the rear mouldboard (8) from rotating around the hinging point (29). Thus the access to the milling drum housing (7) is prevented and the vertical stroke of the rear mouldboard (8) is extended maintaining a safe working condition even in the case of an increased cutting depth. The raising of the mouldboard (8) causes said mouldboard (8) to slide along the fourth surface (34) of the auxiliary block (18) blocking in position the auxiliary block (18) applied to the milling drum housing (7) by means of the couple of slotted holes (36). Thus the unblocking of the auxiliary block (18) is prevented by the mouldboard (8) itself, allowing to have a real fast mounting and demounting of the auxiliary blocks (18).

[0042] It will be apparent that the mouldboard (8) can be obtained in a single piece, without providing a lower section (13) and an upper section (12). The invention will be applicable also in the case of a single piece mouldboard (8). So, in general, the guiding system for milling machine mould board according to the present invention is applicable to any milling machine which is provided with a milling drum housing (7) defined at least by one first sidewall (26), one second sidewall (27) and said mouldboard (8). The invention can be advantageously applied also to existing milling machines provided with a mouldboard (8) which is raisable/lowerable and rotatable around a hinging point (29) with respect to the milling drum housing (7) by means of at least one operating piston (24) between:

• at least one lowered position in which scraping tools (20) applied on the lower end of the mouldboard (8) are in contact with the milled surface and in which the access to the milling drum housing (7) is prevented;
• at least one partially raised position in which the flow of the milled material (23) underneath the mouldboard (8) is allowed, the scraping tools (20) being in contact with the milled material flowing underneath the mouldboard (8) and in which the access to the milling drum housing (7) is prevented;
• a retracted raised position in which the mouldboard (8) is rotated allowing the access to the milling drum housing (7).

The raising/lowering movement of the mouldboard (8) is guided by means of at least one cam-profile (16) which is part of the guiding system, and which forces the mouldboard (8) to move for a certain stroke along the direction defined by sliding surfaces (31, 32) and a third surface (33) of the at least one cam-profile (16).

[0043] At least one sliding surface (31, 32) defines the portion of the stroke of the mouldboard (8) along which the mouldboard (8) is moved between the at least one lowered position in which the scraping tools (20) are in contact with the milled surface and the partially raised position in which the flow of the milled material (23) underneath the mouldboard (8) is allowed

[0044] The third surface (33) defines the position of the stroke of the mouldboard (8) from which the rotation of the mouldboard (8) begins to reach the retracted raised position in which the mouldboard (8) is rotated allowing the access to the milling drum housing (7).

[0045] The guiding system comprises at least one auxiliary block (18) which can be positioned in correspondence of the at least one cam-profile (16). The auxiliary block (18) is provided with a fourth surface (34) which forms an extension of the sliding surfaces (32, 32) constituting a by-pass surface of the third surface (33) preventing the rotation of the mouldboard (8). The raising movement of the mouldboard (8) causes the mouldboard (8) to slide along the fourth surface (34) causing the mouldboard (8) to further move in the vertical direction without starting to rotate around the hinging point (29) extending the vertical stroke of the mouldboard (8). The extended vertical stroke of the mouldboard (8) defines an extended raised position of the mouldboard (8) in which the flow of the milled material (23) underneath the mouldboard (8) is allowed, said scraping tools (20) being in contact with the milled material flowing underneath said mouldboard (8) and in which the access to the milling drum housing (7) is prevented, allowing to keep the mouldboard (8) in a working position also when the cutting depth is about 200 mm or more, thus preventing the possible access of the workers to a very dangerous area and avoiding the inefficient containment of the milled material, which, otherwise, could be spread around by the milling drum (3) rotation.

[0046] In the case in which the mouldboard (8) comprises an upper section (12) and a lower section (13), the lower section (13) is slidable for a certain stroke with respect to the upper section (12) along slot guides (15) obtained on the upper section (12) itself. The sliding of the lower section (13) corresponds to the raising/lowering movement of the mouldboard (8) between the at least one lowered position in which the scraping tools (20) are in contact with the milled surface and the at least one partially raised position in which the flow of the milled material (23) underneath the mouldboard (8) is allowed. The upper section (12) is rotatable around the hinging point (29) with respect to the milling drum housing (7) and the rotation of the upper section (12) corresponds to the at least one partially raised position in which the access to said milling drum housing (7) is allowed. In this case, the at least one cam-profile (16) of the guiding system forces the lower section (13) to move for a certain stroke along the direction defined by the sliding surfaces (31, 32) and the third surface (33) of the at least one cam-profile (16): and the at least one sliding surface (31, 32) defines the portion of the stroke of the lower section (13) along which the lower section (13) is moved between the at least one lowered position in which said scraping tools (20) are in contact with the milled surface and the partially raised position in which the flow of the milled material (23) underneath the mouldboard (8) is allowed. The third surface (33) defines the position of the stroke of the mouldboard (8) from which the rotation of the upper section (12) begins to reach the retracted raised position in which the mouldboard (8) is rotated allowing the access to the milling drum housing (7). The fourth surface (34) of the at least one auxiliary block (18) forms an extension of the sliding surfaces (32, 32) constituting a by-pass surface of the third surface (33) preventing the rotation of the upper section (12). The raising movement of the lower section (13) along the fourth surface (34) causes the lower section (13) to further move in the vertical direction without the rotation of the upper section (12), extending the vertical stroke of the lower section (13). The extended vertical stroke of the lower section (13) defines an extended raised position of the mouldboard (8) in which the flow of the milled material (23) underneath the mouldboard (8) is allowed, said scraping tools (20) being in contact with the milled material flowing underneath said mouldboard (8) and in which the access to the milling drum housing (7) is prevented, allowing to keep the mouldboard (8) in a working position also when the cutting depth is about 200 mm or more, thus preventing the possible access of the workers to a very dangerous area and avoiding the inefficient containment of the milled material, which, otherwise, could be spread around by the milling drum (3) rotation.

[0047] In the preferred embodiment, the guiding system for milling machine mouldboard according to the present invention comprises:

• two cam-profiles (16), each of which is installed in correspondence of one of the first sidewall (26) and second sidewall (27);
• two auxiliary blocks (18), each of which can be positioned in correspondence of one of said cam-profiles (16).

[0048] In general, the cam-profile (16) of the guiding system can be provided with more than one sliding surface (31, 32). For example in the illustrated embodiment (Fig. 11) the cam-profile (16) of the guiding system is provided with a first surface (31) and a second surface (32) and said third surface (33). The first surface (31) and the second surface (32) form sliding surfaces (31, 32) defining the portion of the stroke of the mouldboard (8) along which the mouldboard (8) is moved between the at least one lowered position in which the scraping tools (20) are in contact with the milled surface and the partially raised position in which the flow of the milled material (23) underneath the mouldboard (8) is allowed. The third surface (33) defines the position of the stroke of the mouldboard (8) from which the rotation of the mouldboard (8) begins to reach the retracted raised position in which the mouldboard (8) is rotated allowing the access to the milling drum housing (7). The sliding of the mouldboard (8) along the first surface (31) occurs in an essentially vertical direction without rotation of the mouldboard (8) around the hinging point (29). The sliding of the mouldboard (8) along the second surface (32) occurs in an essentially vertical direction with a slight rotation of the mouldboard (8) around the hinging point (29).

[0049] The description of this invention has been made with reference to the enclosed figures showing a preferred embodiment of the invention itself, but it is evident that many alterations, modifications and variations will be apparent to those skilled in the art in the light of the foregoing description. Thus, it should be understood that the invention is not limited by the foregoing description, but it embraces all such alterations, modifications and variations in accordance with the scope of the appended claims.

Used nomenclature

[0050] With reference to the identification numbers reported in the enclosed figures, the following nomenclature has been used:

1. Chassis

2. Track

3. Milling drum

4. Telescopic columns

5. Collecting conveyor

6. Loading conveyor

7. Milling drum housing

8. Rear mouldboard

9. First side plate

10. Second side plate

11. Pressure bar

12. Upper section

13. Lower section

14. Advancement direction

15. Slot guide

16. Cam-profile

17. Cursor

18. Auxiliary blocks

19. Quick fastening system

20. Scraping tools

21. Retainer

22. Hook

23. Milled material

24. Mouldboard operating pistons

25. Discharge point

26. First sidewall

27. Second sidewall

28. Opening

29. Hinge or hinging point

30. Conveyor system

31. First surface

32. Second surface

33. Third surface

34. Forth surface

35. Fifth surface

36. Slotted hole

37. Enlarged portion

38. Slotted portion

39. Spacer

40. Head

Claims

1. Guiding system for milling machine mouldboard, said milling machine being provided with a milling drum housing (7) defined at least by one first sidewall (26), one second sidewall (27) and said mouldboard (8), said mouldboard (8) being raisable/lowerable and rotatable around a hinging point (29) with respect to said milling drum housing (7) by means of at least one operating piston (24) between:

- at least one lowered position in which scraping tools (20) applied on the lower end of said mouldboard (8) are in contact with the milled surface and in which the access to said milling drum housing (7) is prevented;

- at least one partially raised position in which the flow of the milled material (23) underneath said mouldboard (8) is allowed, said scraping tools (20) being in contact with the milled material flowing underneath said mouldboard (8) and in which the access to said milling drum housing (7) is prevented;

- a retracted raised position in which said mouldboard (8) is rotated allowing the access to said milling drum housing (7);

said raising/lowering movement of said mouldboard (8) being guided by means of at least one cam-profile (16) of said guiding system, which forces said mouldboard (8) to move for a certain stroke along the direction defined by sliding surfaces (31, 32) and a third surface (33) of said at least one cam-profile (16):

- at least one of said sliding surfaces (31, 32) of said at least one cam profile (16) defining the portion of the stroke of said mouldboard (8) along which said mouldboard (8) is moved between said at least one lowered position in which said scraping tools (20) are in contact with the milled surface and said partially raised position in which the flow of the milled material (23) underneath said mouldboard (8) is allowed;

- said third surface (33) defining the position of the stroke of said mouldboard (8) from which the rotation of said mouldboard (8) begins to reach said retracted raised position in which said mouldboard (8) is rotated allowing the access to said milling drum housing (7);

characterized in that said guiding system comprises at least one auxiliary block (18) which can be positioned in correspondence of said at least one cam-profile (16), said auxiliary block (18) being provided with a fourth surface (34) which forms an extension of said sliding surfaces (32, 32) constituting a by-pass surface of said third surface (33) preventing the rotation of said mouldboard (8), the raising movement of said mouldboard (8) causing said mouldboard (8) to slide along said fourth surface (34) causing said mouldboard (8) to further move in the vertical direction without starting to rotate around said hinging point (29) extending the vertical stroke of said mouldboard (8), said extended vertical stroke of said mouldboard (8) defining an extended raised position of said mouldboard (8) in which the flow of the milled material (23) underneath said mouldboard (8) is allowed, said scraping tools (20) being in contact with the milled material flowing underneath said mouldboard (8) and in which the access to said milling drum housing (7) is prevented.

2. Guiding system for milling machine mouldboard, according to the previous claim wherein said mouldboard (8) comprises an upper section (12) and a lower section (13):

- said lower section (13) being slidable for a certain stroke with respect to said upper section (12) along slot guides (15) obtained on said upper section (12), the sliding of said lower section (13) corresponding to said raising/lowering movement of said mouldboard (8) between said at least one lowered position in which said scraping tools (20) are in contact with the milled surface and said at least one partially raised position in which the flow of the milled material (23) underneath said mouldboard (8) is allowed;

- said upper section (12) being rotatable around said hinging point (29) with respect to said milling drum housing (7), the rotation of said upper section (12) corresponding to said at least one partially raised position in which the access to said milling drum housing (7) is allowed;

characterized in that said at least one cam-profile (16) of said guiding system forces said lower section (13) to move for a certain stroke along the direction defined by said sliding surfaces (31, 32) and said third surface (33) of said at least one cam-profile (16):

- said at least one sliding surface (31, 32) defining the portion of the stroke of said lower section (13), along which said lower section (13) is moved between said at least one lowered position in which said scraping tools (20) are in contact with the milled surface and said partially raised position in which the flow of the milled material (23) underneath said mouldboard (8) is allowed;

- said third surface (33) defining the position of the stroke of said mouldboard (8) from which the rotation of said upper section (12) begins to reach said retracted raised position in which said mouldboard (8) is rotated allowing the access to said milling drum housing (7)

said fourth surface (34) of said at least one auxiliary block (18) forming an extension of said sliding surfaces (32, 32) constituting a by-pass surface of said third surface (33) preventing the rotation of said upper section (12), the raising movement of said lower section (13) along said fourth surface (34) causing said lower section (13) to further move in the vertical direction without the rotation of said upper section (12), extending the vertical stroke of the said lower section (13).

3. Guiding system for milling machine mouldboard, according to any of previous claims 1 to 2 characterized in that said guiding system comprises at least one cursor (17) for each of said cam-profiles (16), said cursor (17) being intended to be integral with said mouldboard (8) and forming the contact element of said mouldboard (8) which slides on said at least one cam-profile (16).

4. Guiding system for milling machine mouldboard, according to any of previous claims 1 to 3 characterized in that it comprises:

- two of said cam-profiles (16), each of which is intended to be installed in correspondence of one of said first sidewall (26) and second sidewall (27);

- two of said auxiliary blocks (18), each of which is to be positioned in correspondence of one of said cam-profiles (16).

5. Guiding system for milling machine mouldboard, according to any of previous claims 1 to 4 characterized in that said guiding system comprises a couple of slotted holes (36) to be obtained on said milling drum housing (7) for each of said auxiliary blocks (18), each of said slotted holes (36) consisting of an enlarged portion (37) and a slotted portion (38), the axis of the slotted portion (38) of one of said slotted holes (36) of said couple of said slotted holes (36) being parallel to the axis of the slotted portion (38) of the other one of said slotted holes (36) of said couple of said slotted holes (36), each of said auxiliary blocks (18) being provided with a quick fastening system (19) for each of said slotted holes (36), said quick fastening system (19) consisting of a spacer (39) supporting a head (40), said auxiliary block (18) being intended to be placed in correspondence with said slotted holes (36), said heads (40) of said quick fastening system (19) being intended to be positioned in correspondence of said enlarged portion (37) of the corresponding slotted hole (36), each of the heads (40) being intended to be inserted into the corresponding enlarged portion (37), the auxiliary block (18) being intended to be pulled in the direction of said slotted portion (38) causing said spacer (39) to be inserted and to slide along said slotted portion (38) until said head (40) is prevented to exit from the corresponding enlarged portion (37) of said slotted hole (36), the raising of said mouldboard (8) causing said mouldboard (8) to slide along said fourth surface (34) of said auxiliary block (18) blocking in position said auxiliary block (18) applied to said milling drum housing (7) by means of said couple of slotted holes (36).

6. Guiding system for milling machine mouldboard, according to the previous claim characterized in that said couple of slotted holes (36) for each of said auxiliary blocks (18), is to be obtained in correspondence of said sidewalls (26, 27) of said milling drum housing (7).

7. Guiding system for milling machine mouldboard, according to any of previous claims 1 to 6 characterized in that said auxiliary block (18) is shaped as a right-angle triangularly shaped body.

8. Guiding system for milling machine mouldboard, according to the previous claim characterized in that the hypotenuse of said right-angle triangularly shaped body essentially constitutes said by-pass fourth surface (34) which allows to by-pass said third surface (33) of said lateral cam-profiles (16).

9. Guiding system for milling machine mouldboard, according to any of previous claims 1 to 8 characterized in that said auxiliary block (18) is provided with a side going in an abutment condition with said third surface (33) of said lateral cam-profiles (16).

10. Guiding system for milling machine mouldboard, according to any of previous claims 1 to 9 characterized in that said cam-profile (16) is provided with a first surface (31) and a second surface (32) and said third surface (33), said first surface (31) and said second surface (32) forming sliding surfaces (31, 32) defining the portion of the stroke of said mouldboard (8) along which said mouldboard (8) is moved between said least one lowered position in which said scraping tools (20) are in contact with the milled surface and said partially raised position in which the flow of the milled material (23) underneath said mouldboard (8) is allowed, said third surface (33) defining the position of the stroke of said mouldboard (8) from which the rotation of said mouldboard (8) begins to reach said retracted raised position in which said mouldboard (8) is rotated allowing the access to said milling drum housing (7), the sliding of said mouldboard (8) along said first surface (31) occurring in an essentially vertical direction without rotation of said mouldboard (8) around said hinging point (29), the sliding of said mouldboard (8) along said second surface (32) occurring in an essentially vertical direction with a slight rotation of said mouldboard (8) around said hinging point (29).

11. Milling machine characterized in that it is provided with a guiding system for mouldboard (8) according to any of previous claims 1 to 10.

Ansprüche

1. Führungssystem für Abstreifschild an Bodenfräsmaschinen, wobei die Fräse mit einem Fräswalzengehäuse (7) ausgestattet ist, das mindestens von einer ersten Seitenwand (26), einer zweiten Seitenwand (27) und dem Abstreifschild (8) definiert wird, wobei das Abstreifschild (8) hebbar/senkbar und mittels mindestens eines Arbeitskolbens (24) um einen Anlenkpunkt (29) in bezug auf das Fräswalzengehäuse (7) drehbar ist zwischen:

mindestens einer abgesenkten Position, in der Schabewerkzeuge (20), die am unteren Ende des Abstreifschilds (8) angebracht sind, in Kontakt mit der gefrästen Oberfläche stehen, und wobei der Zugriff auf besagtes Fräswalzengehäuse (7) verhindert wird;

mindestens einer teilweise angehobenen Position, in der der Fluss des gefrästen Materials (23) unterhalb des Abstreifschildes (8) erlaubt ist, wobei die Schabewerkzeuge (20) in Kontakt mit dem gefrästen Material stehen, das unterhalb des Abstreifschildes (8) fließt, und wobei der Zugriff auf besagtes Fräswalzengehäuse (7) verhindert wird;

einer zurückgezogenen angehobenen Position, in der besagtes Abstreifschild (8) gedreht ist, was den Zugriff auf das Fräswalzengehäuse (7) gestattet;

besagte Hebe-/Senkbewegung des Abstreifschildes (8) wird mittels mindestens eines Nockenprofils (16) des Führungssystems geführt, das das Abstreifschild (8) zwingt, sich einen gewissen Hub lang in der Richtung zu bewegen, die von Gleitflächen (31,32) und einer dritte Oberfläche (33) des mindestens einen Nockenprofils (16) definiert wird:

wobei mindestens eine der Gleitflächen (31,32) des mindestens einen Nockenprofils (16) den Teils des Hubs des Abstreifschildes (8) definiert, entlang dem das Abstreifschild (8) zwischen der mindestens einen abgesenkten Position, in der die Schabewerkzeuge (20) in Kontakt mit der gefrästen Oberfläche sind, und der teilweise angehobenen Position, in der der Fluss des gefrästen Materials (23) unterhalb des Abstreifschildes (8) erlaubt ist, bewegt wird;

besagte dritte Oberfläche (33) definiert die Position des Hubs des Abstreifschilds (8), von der an die Rotation des Abstreifschilds (8) beginnt, die zurückgezogene angehobene Position zu erreichen, in die das Abstreifschild (8) gedreht wird, was den Zugriff auf besagtes Fräswalzengehäuse (7) gestattet;

gekennzeichnet dadurch, dass besagtes Führungssystem mindestens einen Hilfsblock (18) umfasst, der an besagtem mindestens einem Nockenprofil (16) positioniert werden kann, wobei der Hilfsblock (18) mit einer vierten Oberfläche (34) ausgestattet ist, die eine Verlängerung der Gleitflächen (32,32) bildet, so dass eine Bypassfläche der dritten Oberfläche (33) zur Verhinderung der Rotation des Abstreifschilds (8) entsteht, wobei die Hebebewegung des Abstreifschilds (8) dazu führt, dass das Abstreifschild (8) entlang besagter vierter Oberfläche (34) gleitet,

was dazu führt, dass das Abstreifschild (8) sich in senkrechter Richtung weiter bewegt, ohne um den Anlenkpunkt (29) zu rotieren, was den senkrechten Hub des Abstreifschilds (8) verlängert, wobei der verlängerte senkrechte Hub des Abstreifschilds (8) eine verlängerte angehobene Position des Abstreifschilds (8) definiert, in der der Fluss des gefrästen Materials (23) unterhalb des Abstreifschilds (8) erlaubt ist, wobei die Schabewerkzeuge (20) in Kontakt mit dem gefrästen Material sind, das unterhalb des Abstreifschilds (8) fließt, und wobei der Zugriff auf das Fräswalzengehäuse (7) verhindert wird.

2. Führungssystem für Abstreifschild an Bodenfräsmaschinen nach dem vorherigen Anspruch, wobei besagtes Abstreifschild (8) einen oberen Abschnitt (12) und einen unteren Abschnitt (13) umfasst:

besagter unterer Abschnitt (13) gleitet einen gewissen Hub lang in bezug auf den oberen Abschnitt (12) entlang Schlitzführungen (15), die auf dem oberen Abschnitt (12) vorhanden sind, wobei das Gleiten des unteren Abschnitts (13) der Hebe-/Senkbewegung des Abstreifschilds (8) zwischen der mindestens einen abgesenkten Position entspricht, in der die Schabewerkzeuge (20) in Kontakt mit der gefrästen Oberfläche sind, und der mindestens einen teilweise angehobenen Position, in der der Fluss des gefrästen Materials (23) unterhalb des Abstreifschilds (8) erlaubt ist;

besagter oberer Abschnitt (12) ist um den Anlenkpunkt (29) in bezug auf das Fräswalzengehäuse (7) drehbar, wobei die Rotation des oberen Abschnitts (12) der mindestens einen teilweise angehobenen Position entspricht, in der der Zugriff auf das Fräswalzengehäuse (7) erlaubt ist;

gekennzeichnet dadurch, dass das mindestens eine Nockenprofil (16) des Führungssystems den unteren Abschnitt (13) zwingt, sich einen gewissen Hub lang in der Richtung zu bewegen, die von besagten Gleitflächen (31, 32) und besagter dritten Oberfläche (33) des mindestens einen Nockenprofils (16) definiert wird,

wobei die mindestens eine Gleitoberfläche (31,32) den Teil des Hubs des unteren Abschnitts (13) definiert, entlang dem der untere Abschnitt (13) zwischen der mindestens einen abgesenkten Position, in der die Schabewerkzeuge (20) in Kontakt mit der gefrästen Oberfläche sind, und der teilweise angehobenen Position, in der der Fluss des gefrästen Materials (23) unterhalb des Abstreifschilds (8) erlaubt ist, bewegt wird;

besagte dritte Oberfläche (33) definiert die Position des Hubs des Abstreifschilds (8), von der aus die Rotation des oberen Abschnitts (12) beginnt, die zurückgezogene angehobene Position zu erreichen, in die das Abstreifschild (8) gedreht wird, was den Zugriff auf das Fräswalzengehäuse (7) gestattet,

die vierte Oberfläche (34) des mindestens eines Hilfsblocks (18) bildet eine Verlängerung der Gleitflächen (32,32), so dass eine Bypassfläche der dritten Oberfläche (33) zur Verhinderung der Rotation des oberen Abschnitts (12) entsteht, wobei die Hebebewegung des unteren Abschnitts (13) entlang besagter vierter Oberfläche (34) dazu führt, dass der untere Abschnitt (13) sich in senkrechter Richtung weiter bewegt, ohne Rotation des oberen Abschnitts (12), zur Verlängerung des senkrechten Hubs des unteren Abschnitts (13).

3. Führungssystem für Abstreifschild an Bodenfräsmaschinen nach einem der vorherigen Ansprüche 1 bis 2, gekennzeichnet dadurch, dass besagtes Führungssystem mindestens einen Läufer (17) für jedes der Nockenprofile (16) umfasst, wobei der Läufer (17) einstückig mit dem Abstreifschild (8) sein soll und das Kontaktstück des Abstreifschilds (8) bildet, das auf dem mindestens einen Nockenprofil (16) gleitet.

4. Führungssystem für Abstreifschild an Bodenfräsmaschinen nach einem der vorherigen Ansprüche 1 bis 3, gekennzeichnet dadurch, dass er folgendes umfasst:

zwei Nockenprofile (16), die an der ersten Seitenwand (26) bzw. zweiten Seitenwand (27) installiert werden sollen; zwei Hilfsblöcke (18), von denen jeder bei einem der Nockenprofile (16) positioniert werden soll.

5. Führungssystem für Abstreifschild an Bodenfräsmaschinen nach einem der vorherigen Ansprüche 1 bis 4, gekennzeichnet dadurch, dass das Führungssystem ein Paar Langlöcher (36) umfasst, die auf dem Fräswalzengehäuse (7) für jeden der Hilfsblöcke (18) erhalten werden, wobei jedes der Langlöcher (36) aus einem erweiterten Teil (37) und einem geschlitzten Teil (38) besteht, wobei die Achse des geschlitzten Teils (38) eines der Langlöcher (36) des Paars von Langlöchern (36) parallel zur Achse des geschlitzten Teils (38) des anderen Langlochs (36) des Paars von Langlöchern (36) verläuft, wobei jeder der Hilfsblöcke (18) mit einem Schnellbefestigungssystem (19) für jedes der Langlöcher (36) ausgestattet ist, wobei das Schnellbefestigungssystem (19) aus einem Distanzstück (39) besteht, das einen Kopf (40) stützt, wobei der Hilfsblock (18) an den Langlöchern (36) platziert sein soll und die Köpfe (40) des Schnellbefestigungssystems (19) an dem erweiterten Teil (37) des entsprechenden Langlochs (36), wobei jeder der Köpfe (40) in das entsprechende erweiterte Teil (37) eingefügt werden soll und der Hilfsblock (18) in Richtung des geschlitzten Teils (38) gezogen werden soll, was dazu führt dass das Distanzstück (39) eingefügt wird und entlang dem geschlitzten Teil (38) gleitet, bis der Kopf (40) daran gehindert wird, aus dem entsprechenden erweiterten Teil (37) des Langlochs (36) auszutreten, wobei die Anhebung des Abstreifschildes (8) dazu führt, dass das Abstreifschild (8) entlang besagter vierter Oberfläche (34) des Hilfsblocks (18) gleitet und den Hilfsblock (18) blockiert, der am Fräswalzengehäuse (7) mittels des Paars von Langlöchern (36) angebracht ist.

6. Führungssystem für Abstreifschild an Bodenfräsmaschinen, nach dem vorherigen Anspruch, gekennzeichnet dadurch, dass das Paar von Langlöchern (36) für jeden der Hilfsblöcke (18) an den Seitenwänden (26,27) des Fräswalzengehäuses (7) erhalten werden soll.

7. Führungssystem für Abstreifschild an Bodenfräsmaschinen nach einem der vorherigen Ansprüche 1 bis 6, gekennzeichnet dadurch, dass der Hilfsblock (18) wie ein rechtwinkliges Dreieck geformt ist.

8. Führungssystem für Abstreifschild an Bodenfräsmaschinen nach dem vorherigen Anspruch, gekennzeichnet dadurch, dass die Hypotenuse des wie ein rechtwinkliges Dreieck geformten Körpers im wesentlichen besagte vierte Bypassfläche (34) bildet, was es gestattet, die dritte Oberfläche (33) der seitlichen Nockenprofile (16) zu umgehen.

9. Führungssystem für Abstreifschild an Bodenfräsmaschinen nach einem der vorherigen Ansprüche 1 bis 8, gekennzeichnet dadurch, dass der Hilfsblock (18) eine Seite aufweist, die in Anschlag mit besagter dritter Oberfläche (33) der seitlichen Nockenprofile (16) kommt.

10. Führungssystem für Abstreifschild an Bodenfräsmaschinen nach einem der vorherigen Ansprüche 1 bis 9, gekennzeichnet dadurch, dass das Nockenprofil (16) eine erste Oberfläche (31) und eine zweite Oberfläche (32) und besagte dritte Oberfläche (33) aufweist, wobei die erste Oberfläche (31) und die zweite Oberfläche (32) Gleitflächen (31,32) bilden, die den Teil des Hubs des Abstreifschilds (8) definieren, entlang dem das Abstreifschild (8) zwischen der mindestens einen abgesenkten Position, in der die Schabewerkzeuge (20) in Kontakt mit der gefrästen Oberfläche sind, und der teilweise angehobenen Position, in der der Fluss des gefrästen Materials (23) unterhalb des Abstreifschilds (8) erlaubt ist, bewegt wird, wobei die dritte Oberfläche (33) die Position des Hubs des Abstreifschilds (8) definiert, von der an die Rotation des Abstreifschilds (8) beginnt, die zurückgezogene angehobene Position zu erreichen, in der das Abstreifschild (8) gedreht wird, was den Zugriff auf das Fräswalzengehäuse (7) gestattet, wobei das Gleiten des Abstreifschilds (8) entlang besagter erster Oberfläche (31) in einer im wesentlichen senkrechten Richtung erfolgt, ohne Rotation des Abstreifschilds (8) um den Anlenkpunkt (29) herum, während das Gleiten des Abstreifschilds (8) entlang besagter zweiter Oberfläche (32) in einer im wesentlichen senkrechten Richtung erfolgt, mit einer leichten Rotation des Abstreifschilds (8) um den Anlenkpunkt (29) herum.

11. Fräse, gekennzeichnet dadurch, dass sie ein Führungssystem für Abstreifschild (8) nach einem der vorherigen Ansprüche 1 bis 10 aufweist.

Revendications

1. Système de guidage pour versoir de machine à fraiser le sol, ladite machine à fraiser le sol étant pourvue d'un logement de tambour de fraisage (7) défini au moins par une première paroi latérale (26), une deuxième paroi latérale (27) et ledit versoir (8), ledit versoir (8) étant relevable/abaissable et capable de tourner autour d'un point de charnière (29) par rapport audit logement de tambour de fraisage (7) au moyen d'au moins un piston moteur (24) entre :

- au moins une position abaissée où des outils de raclage (20) appliqués sur l'extrémité inférieure dudit versoir (8) sont en contact avec la surface fraisée et où l'accès audit logement de tambour de fraisage (7) est empêché;

- au moins une position partiellement soulevée où le flux du matériau fraisé (23) au-dessous dudit versoir (8) est autorisé, lesdits outils de raclage (20) étant en contact avec le matériau fraisé s'écoulant au-dessous dudit versoir (8) et où l'accès audit logement de tambour de fraisage (7) est empêché;

- une position soulevée rétractée vers laquelle ledit versoir (8) est tourné permettant l'accès audit logement de tambour de fraisage (7);

ledit mouvement ascendant/descendant dudit versoir (8) étant guidé au moyen d'au moins un profil de came (16) dudit système de guidage, ce qui force ledit versoir (8) à se déplacer pour une certaine course le long de la direction définie par des surfaces de glissement (31,32) et une troisième surface (33) dudit au moins un profil de came (16):

- au moins l'une desdites surfaces de glissement (31,32) dudit au moins un profil de came (16) définissant la partie de la course dudit versoir (8) le long de laquelle ledit versoir (8) est déplacé entre ladite au moins une position abaissée où lesdits outils de raclage (20) sont en contact avec la surface fraisée et ladite position partiellement soulevée où le flux du matériau fraisé (23) au-dessous dudit versoir (8) est autorisé;

- ladite troisième surface (33) définissant la position de la course dudit versoir (8) d'où la rotation dudit versoir (8) commence à atteindre ladite position soulevée rétractée où ledit versoir (8) est tourné permettant l'accès audit logement de tambour de fraisage (7); caractérisé en ce que ledit système de guidage comprend au moins un bloc auxiliaire (18) qui peut être positionné près dudit au moins un profil de came (16), ledit bloc auxiliaire (18) étant pourvu d'une quatrième surface (34) qui forme une extension desdites surfaces de glissement (32,32) constituant une surface de contournement de ladite troisième surface (33) empêchant la rotation dudit versoir (8), le mouvement ascendant dudit versoir (8) causant le glissement dudit versoir (8) le long de ladite quatrième surface (34) causant le déplacement dudit versoir (8) en direction verticale sans commencer à tourner autour dudit point de charnière (29) déployant la course verticale dudit versoir (8), ladite course verticale déployée dudit versoir (8) définissant une position soulevée déployée dudit versoir (8) où le flux du matériau fraisé (23) au-dessous dudit versoir (8) est autorisé, lesdits outils de raclage (20) étant en contact avec le matériau fraisé s'écoulant au-dessous dudit versoir (8) et où l'accès audit logement de tambour de fraisage (7) est empêché.

2. Système de guidage pour versoir de machine à fraiser le sol, conformément à la revendication précédente où ledit versoir (8) comprend une section supérieure (12) et une section inférieure (13):

- ladite section inférieure (13) étant susceptible de glisser pour une certaine course par rapport à ladite section supérieure (12) le long de guides de fente (15) obtenues sur ladite section supérieure (12), le glissement de ladite section inférieure (13) correspondant audit mouvement ascendant/ descendant dudit versoir (8) entre ladite au moins une position abaissée où lesdits outils de raclage (20) sont en contact avec la surface fraisée et ladite au moins une position partiellement soulevée où le flux du matériau fraisé (23) au-dessous dudit versoir (8) est autorisé;

- ladite section supérieure (12) étant capable de tourner autour dudit point de charnière (29) par rapport audit logement de tambour de fraisage (7), la rotation de ladite section supérieure (12) correspondant à ladite au moins une position partiellement soulevée où l'accès audit logement de tambour de fraisage (7) est autorisé;

caractérisé en ce que ledit au moins un profil de came (16) dudit système de guidage force ladite section inférieure (13) à se déplacer pour une certaine course le long de la direction définie par lesdites surfaces de glissement (31, 32) et ladite troisième surface (33) dudit au moins un profil de came (16):

- ladite au moins une surface de glissement (31, 32) définissant la partie de la course de ladite section inférieure (13), le long de laquelle ladite section inférieure (13) est déplacée entre ladite au moins une position abaissée où lesdits outils de raclage (20) sont en contact avec la surface fraisée et ladite position partiellement soulevée où le flux du matériau fraisé (23) au-dessous dudit versoir (8) est autorisé;

- ladite troisième surface (33) définissant la position de la course dudit versoir (8) à partir de laquelle la rotation de ladite section supérieure (12) commence à atteindre ladite position soulevée rétractée où ledit versoir (8) est tourné permettant l'accès audit logement de tambour de fraisage (7)

ladite quatrième surface (34) dudit au moins un bloc auxiliaire (18) formant une extension desdites surfaces de glissement (32, 32) constituant une surface de contournement de ladite troisième surface (33) empêchant la rotation de ladite section supérieure (12), le mouvement ascendant de ladite section inférieure (13) le long de ladite quatrième surface (34) causant le déplacement de ladite section inférieure (13) en direction verticale, sans la rotation de ladite section supérieure (12), déployant la course verticale de ladite section inférieure (13).

3. Système de guidage pour versoir de machine à fraiser le sol, selon l'une quelconque des revendications précédentes 1 à 2 caractérisé en ce que ledit système de guidage comprend au moins un curseur (17) pour chacun desdits profils de came (16), ledit curseur (17) étant destiné à être partie intégrante dudit versoir (8) et formant l'élément de contact dudit versoir (8) qui glisse sur ledit au moins un profil de came (16).

4. Système de guidage pour versoir de machine à fraiser le sol, selon l'une quelconque des revendications précédentes 1 à 3 caractérisé en ce qu'il comprend :

- deux desdits profils de came (16), chacun étant destiné à être installé près de l'une desdites première paroi latérale (26) et deuxième paroi latérale (27);

- deux desdits blocs auxiliaires (18), chacun destiné à être positionné en correspondance avec l'un desdits profils de came (16).

5. Système de guidage pour versoir de machine à fraiser le sol, selon l'une quelconque des revendications précédentes 1 à 4 caractérisé en ce que ledit système de guidage comprend une paire de trous oblongs (36) à obtenir sur ledit logement de tambour de fraisage (7) pour chacun desdits blocs auxiliaires (18), chacun desdits trous oblongs (36) étant composé d'une partie agrandie (37) et une partie fendue (38), l'axe de la partie fendue (38) de l'un desdits trous oblongs (36) de ladite paire desdits trous oblongs (36) étant parallèle à l'axe de la partie fendue (38) de l'autre desdits trous oblongs (36) de ladite paire desdits trous oblongs (36), chacun desdits blocs auxiliaires (18) étant pourvu d'un système de fixation rapide (19) pour chacun desdits trous oblongs (36), ledit système de fixation rapide (19) étant composé d'une cale d'espacement (39) supportant une tête (40), ledit bloc auxiliaire (18) étant destiné à être placé près desdits trous oblongs (36), lesdites têtes (40) dudit système de fixation rapide (19) étant destinées à être positionnées près de ladite partie agrandie (37) du trou oblong correspondant (36), chacune des têtes (40) étant destinée à être insérée dans la partie agrandie correspondante (37), le bloc auxiliaire (18) étant destiné à être tiré en direction de ladite partie fendue (38) causant l'insertion et le glissement de ladite cale d'espacement (39) le long de ladite partie fendue (38) jusqu'à ce que ladite tête (40) est empêchée de sortir de la partie agrandie correspondante (37) dudit trou oblong (36), le mouvement ascendant dudit versoir (8) causant le glissement dudit versoir (8) le long de ladite quatrième surface (34) dudit bloc auxiliaire (18), bloquant ledit bloc auxiliaire (18) appliqué audit logement de tambour de fraisage (7) au moyen de ladite paire de trous oblongs (36).

6. Système de guidage pour versoir de machine à fraiser le sol, conformément à la revendication précédente caractérisé en ce que ladite paire de trous oblongs (36) pour chacun desdits blocs auxiliaires (18), doit être obtenue en correspondance avec lesdites parois latérales (26, 27) dudit logement de tambour de fraisage (7).

7. Système de guidage pour versoir de machine à fraiser le sol, selon l'une quelconque des revendications précédentes 1 à 6 caractérisé en ce que ledit bloc auxiliaire (18) est formé comme un triangle rectangle.

8. Système de guidage pour versoir de machine à fraiser le sol, conformément à la revendication précédente caractérisé en ce que l'hypothénuse dudit triangle rectangle constitue essentiellement ladite quatrième surface de contournement (34) qui permet de contourner ladite troisième surface (33) desdits profils de came latéraux (16).

9. Système de guidage pour versoir de machine à fraiser le sol, selon l'une quelconque des revendications précédentes 1 à 8 caractérisé en ce que ledit bloc auxiliaire (18) est pourvu d'un côté qui va en butée avec ladite troisième surface (33) desdits profils de came latéraux (16).

10. Système de guidage pour versoir de machine à fraiser le sol, selon l'une quelconque des revendications précédentes 1 à 9 caractérisé en ce que ledit profil de came (16) est pourvu d'une première surface (31) et une deuxième surface (32) et de ladite troisième surface (33), ladite première surface (31) et ladite deuxième surface (32) formant des surfaces de glissement (31, 32) définissant la partie de la course dudit versoir (8) le long de laquelle ledit versoir (8) est déplacé entre ladite au moins une position abaissée où lesdits outils de raclage (20) sont en contact avec la surface fraisée et ladite position partiellement soulevée où le flux du matériau fraisé (23) au-dessous dudit versoir (8) est autorisé, ladite troisième surface (33) définissant la position de la course dudit versoir (8) à partir de laquelle la rotation dudit versoir (8) commence à atteindre ladite position soulevée rétractée où ledit versoir (8) est tourné permettant l'accès audit logement de tambour de fraisage (7), le glissement dudit versoir (8) le long de ladite première surface (31) se faisant dans une direction essentiellement verticale, sans rotation dudit versoir (8) autour dudit point de charnière (29), le glissement dudit versoir (8) le long de ladite deuxième surface (32) se faisant dans une direction essentiellement verticale, avec une petite rotation dudit versoir (8) autour dudit point de charnière (29).

11. Machine à fraiser le sol caractérisé en ce que celle-ci est pourvue d'un système de guidage pour versoir (8) selon l'une quelconque des revendications précédentes 1 à 10.

Drawing