LOCKING SYSTEM FOR A ROLLER BLIND

Abstract

 The present invention refers to a locking system for a roller awning associated to a terminal adapted to slide along guides to displace the awning between a wound position and an extended position. The locking system comprises first coupling means associable to the terminal and each provided with an engaging element adapted to move between a first position, in which the terminal slides along the guides, and a second position, in which the engaging element cooperates with a respective abutting element of second coupling means associable to a respective stop section of the guides to reversibly lock the awning in the extended position and apply a tensioning to the same by winding it. Specifically, the second coupling means are associable to the respective stop section so that they slide in the direction of the guides between an inactive position, when the engaging element is in the first position, and a retaining position, when the engaging element is in the second position and cooperates with the respective abutting element. The stop section further comprises at least an elastic retaining element that applies to the respective second coupling means a force opposed to the winding direction when said means are in the retaining position.

Description

TECHNICAL FIELD OF INVENTION

[0001] The present invention refers to a locking system for roller awnings slidable along guides, preferably by means of automatic or manual displacement.

STATE OF THE ART

[0002] Roller awning structures that slide along guides are well known and, generally, comprise an upper crosspiece that connects two parallel lateral guides and along which slides an awning typically made from a plastic material, such as for example polyvinylchloride (PVC) or the like, or from a canvas made from suitable materials. The awning is connected at an end edge to a winding mechanism, such as for example a winding roller, provided on the upper crosspiece of the structure and driven preferably by a motor, or manually by means of a crank mechanism, to carry out the operations of displacing the awning, during which the awning is wound and unwound by means of the winding mechanism. During the displacement operations, the awning is tensioned thanks to the force of its own weight applied by a terminal formed from a substantially tubular element arranged at the free end edge of the awning.

[0003] Generally, the structures of roller awnings are provided with a locking system that locks the terminal reversibly when the awning is in a completely unwound state. Specifically, a locking system is provided wherein, when the terminal of the awning reaches the limit-stop-position of the lateral guides, it is adapted to bind it rigidly to the structure, thereby increasing the tensioning of the awning and consequently improving its resistance to external stresses, such as for example the wind that impacts the awning sideways.

[0004] In the prior art are known automatic locking systems which, unlike the manual ones, guarantee a reliable locking of the two ends of the terminal of the awning to the structure. Specifically, the locking systems of automatic type perform a reversible and coordinated locking of both ends of the terminal when they are in the correct position to perform the operation of locking the terminal. In this state, therefore, a correct operation of the structure of the awning is guaranteed, avoiding possible damage or malfunctions due, for example, to the locking of only one of the ends of the terminal which, typically, is caused by an asymmetrical movement of the terminal along the lateral guides.

[0005] Patent document EP3024996 describes a prior art locking system 1 that also performs the locking operation automatically. Referring to Figs. 1 and 2 enclosed with the present description, the locking system 1 comprises first coupling means 40, provided at each end of a terminal 3 of the awning, which are adapted to cooperate with second coupling means 50 provided at the lower limit-stop-position of lateral guides on the structure of the awning.

[0006] Referring in particular to Fig. 1, the first coupling means 40 each comprise an engaging element 4, such as for example a pin, which is adapted to shift from a first retracted position, in which the terminal 3 can run freely along the lateral guides, and a second extended position (shown in Fig. 1) which accomplishes the removable locking of the terminal 3 at the second coupling means 50. The signal to obtain the locking is triggered when first actuating means 6, such as for example magnetic switches associated with the first coupling means 40, and second actuating means 7, such as for example permanent magnets associated with the second coupling means 50, are near each other and at a distance adapted to guarantee a mutual magnetic interaction.

[0007] The variation between the first position and the second position is achieved by means of an axial displacement of the engaging element 4, such as a pin, which is slidable thanks to the operation of an actuator 44, such as an electric motor provided with transmission means 48 such as a lead screw engaged by a screw, and thanks to a spring 15, such as a pressure spring, adapted to urge the displacement of the engaging element 4 to the first position.

[0008] In the first position of the engaging element 4, the actuator 44 is in a first retraction state in which the engaging element 4 is urged by only the spring 15, which tends to bring it to the retracted position, that is, to the first position. Instead, in the second position of the engaging element 4, the actuator 44 is in a second extension state in which the engaging element 4 is brought to the extended position, that is to the second position, overcoming an opposing force that is generated by the deformation of the spring 15.

[0009] The second coupling means 50, provided at the lower limit-stop-position of the lateral guides of the awning structure, each comprise an external shell, adapted to be operatively engaged by the first coupling means 40, and an abutting element 5C integral with the external shell which is adapted to cooperate with the respective engaging element 4 to allow its passage, when it is in the first position, and to block its passage, that is, interfere, when it is in the second position. Specifically, in Fig. 1 is shown the engaging element 4 in the second position and abutting against the respective abutting element 5C in a state that achieves the locking of the terminal 3 and allows a subsequent tensioning of the awning, through a winding of the latter.

[0010] Referring in particular to Fig. 2, patent document EP3024996 describes an advantageous operative condition of the locking system 1 wherein, when the engaging elements 4 are in the second position and also abut against the respective abutting elements 5C, the terminal 3 of the awning is returned upward by the winding of the awning so as to tension it and generate a friction between the surface of the abutting elements 5C and the respective engaging elements 4. In this state, the actuator 44 is brought to the first retraction state wherein the engaging element 4 is urged by only the spring 15, which would tend to lead it to the first retracted position; however, the engaging element 4 remains in the second position by the effect of the friction generated at the point of contact with the abutting elements 5C and which is induced by the tensioning of the awning. In this state, the locking of the terminal 3 of the awning is also guaranteed by the cooperation of the engaging elements 4 with the respective abutting elements 5C when the actuator 44 is brought to the first retraction state.

[0011] To unlock the terminal 3, it is therefore sufficient to slightly displace it downward, for example by unwinding the awning or manually applying on it a slight downward pressure, so that the action of the friction ends and the spring 15 brings the engaging element 4 to the first retracted position.

[0012] Thus, in this specific operative condition it is not necessary for the first actuation means 6 to interact with the second actuation means 7 so as to trigger the change of state of the actuator 44 to unlock the terminal 3. Consequently, this operative condition is particularly advantageous, as it makes it possible to unlock the terminal 3 of the awning in conditions of absence of power, for example when it is due to power failure.

[0013] Although the locking system 1 described in EP3024996 which acts in this specific operative condition offers important advantages, it has some drawbacks that must be solved.

[0014] In particular, the awning is typically formed with a plastic material, such as for example a flexible sheet of polyvinylchloride PVC), or with a fabric of suitable material, such as for example a synthetic or natural material, or combinations thereof. The material used for making the awning, which is therefore in the form of a sheet or which makes up the threads of the fabric, is subject to deformation or stretching in the conditions of use. In other words, when the terminal 3 of the awning is locked, due to the cooperation of the abutting elements 5C with the respective engaging elements 4, and a further tensioning is applied by the winding of the awning, its material is likely to undergo a deformation which, at some moment after the locking of the terminal 3, causes a displacement of the latter downward owing, for example, to its weight. Therefore, this deformation causes a decrease in the tensioning of the awning and, consequently, a decrease in the friction between the surface of the abutting elements 5C and the respective engaging elements 4.

[0015] In this state, when the friction decreases below a limit threshold, since the actuator 44 is in the retraction state of Fig. 2, the engaging element 4 is brought to the first position by the urging of the spring 15, overcoming the friction with the abutting elements 5C. Thus, in an undesired manner, the terminal 3 of the awning is unlocked, in other words it is no longer rigidly connected to the structure.

[0016] This drawback is also probable in the case in which the awning is made with a fabric with a mesh subject to deformation, or a relative displacement, due for example to the tensioning applied to the awning. In this state, the deformation of the threads generates a decrease in the tensioning of the awning and, consequently, a decrease in the friction between the surface of the abutting elements 5C and the respective engaging elements 4, causing the unlocking of the terminal 3 as mentioned earlier.

[0017] Moreover, the material used in the production of the awning is subject to deformation caused by the operational environmental conditions, such as for example changes in temperature, moisture or similar conditions, which cause an expansion of the material. In other words, when the terminal 3 of the awning is locked and a subsequent tensioning is applied, the environmental conditions are likely to contribute to a deformation of the material of the awning which, at a certain moment after the locking of the terminal, generates a decreased tensioning of the awning. Consequently, the decreased tensioning of the tent causes a lower friction between the surface of the abutting elements 5C and the respective engaging elements 4, thus causing the unlocking of the terminal 3 as previously mentioned.

[0018] Moreover, an external stress, such as for example wind impacting the awning transversally with a relatively high force, can lead to a sudden and momentarily decreased tensioning of the awning, due to a deformation of the same. Consequently, the decreased tensioning of the awning causes a decreased friction between the surface of the abutting elements 5C and the respective engaging elements 4, causing the unlocking of the terminal 3 as mentioned earlier.

[0019] It is evident that, also in a case in which the unlocking system is of a manual instead of an automatic type and the actuator 44 can be activated manually, for example by means of a manually operated slidable cursor, the drawbacks described previously can be expected.

[0020] Consequently, it is necessary to design an unlocking system that solves the previously described drawbacks.

SUMMARY OF THE INVENTION

[0021] The objective of the present invention concerns the production of a locking system for awning structures of roller type slidable along guides that guarantees, at some moment after the locking of the terminal, the maintenance of a tensioning of the awning even after a deformation of the same, that is, following a deformation of the material from which it is made.

[0022] In the scope of the above objective, one purpose of the present invention is to achieve a locking system that compensates for a deformation of the awning, and that guarantees the maintenance of friction between the surface of the abutting elements, on the second coupling means associated to the lateral guides, and the respective locking elements, of the first coupling means associated to the terminal of the awning. Specifically, if the friction between the surface of the abutting elements and the respective engaging elements is maintained above a limit threshold, the latter are maintained in the second extended position even when the actuator that moves them is brought operatively from the extension state, which achieves the locking of the terminal, to the retraction state, in which the locking of the terminal is maintained only by friction.

[0023] A further purpose regards the implementation of a locking system that is sturdy and easy to design, without requiring particular devices, so as to adapt it to different types of awnings of roller type.

[0024] A further purpose regards the implementation of a locking system that can be obtained by using the usual plants, machinery and equipment.

[0025] The above objective and purposes, and others that will be more evident later in the description, are achieved by means of a locking system for structures of roller awnings slidable along guides, as defined in claim 1.

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The further characteristics and advantaged of the locking system for structures of roller awnings slidable along guides, according to the present invention, will become evident in the description which follow relative to the preferred embodiments given purely by way of example, without limitations, with reference to the following figures, wherein:

• Fig. 1 is a section view of a locking system for awning structures of roller type, according to the prior art, during an operative phase for locking the awning;
• Fig. 2 is a section view of the locking system of Fig. 1 in a specific operative condition, provided in the prior art, for locking the awning;
• Fig. 3 is a perspective exploded view of a locking system for awning structures of roller type, according to a first preferred embodiment of the present invention;

• Fig. 4 is a section view of a locking system for awning structures of roller type of Fig. 3, in a free sliding phase;
• Fig. 5 is a section view of the locking system for awning structures of roller type of Fig. 3, in a first operative phase for locking the awning;
• Fig. 6 is a section view of the locking system for awning structures of roller type of Fig. 3, in a second operative phase for locking the awning;
• Fig. 7 is an exploded perspective view of a locking system for awning structures of roller type, according to a second preferred embodiment of the present invention;
• Fig. 8 is a view from below of the locking system for awning structures of roller type of Fig. 7;
• Fig. 9 is a section view of the locking system for awning structures of roller type seen along line B-B in Fig. 8, in a second operative phase for locking the awning;
• Fig. 10 is a section view of the locking system for awning structures of roller type seen along line A-A in Fig. 8, in a second operative phase for locking the awning;

DETAILED DESCRIPTION OF THE INVENTION

[0027] In the description which follows, terms such as "above", "below", "high", "low", "upper", "lower", "vertical", "horizontal", "lateral" and similar ones refer to a locking system for awning structures of roller type slidable along guides according to the present invention in the normal use arrangement, as shown in the enclosed figures.

[0028] For practical reasons, in the present description are illustrated and described elements comprised in the locking system that are arranged on one of the two sides of the structure of the awning, however it will be clear that on the opposite side there are identical elements, arranged symmetrically and operating in a like manner as those described and illustrated.

[0029] Referring to Figs. 3, 4, 5 and 6, a locking system 100 is shown for awnings of roller type slidable along guides, in a first preferred embodiment. The locking system 100 comprises a pair of lateral guides 200, parallel to each other and preferably vertical, that branch off from an upper crosspiece (not shown) of the structure that is coupled to a wall, such as a ceiling. The guides 200 are provided with respective stop sections 204, or lower end portions, that rest preferably on a horizontal surface such as the floor or a base plane of the structure of the awning.

[0030] The guides 200 guide the movement of an awning (not shown) made for example from a plastic material, such as for example a flexible sheet of polyvinylchloride (PVC), or from a fabric of suitable material, such as for example a synthetic or natural material, or combinations thereof. The awning is attached with a first end edge to a winding mechanism (not shown), such as for example a take-up roller installed in the upper crosspiece, and with a second end edge, opposite the first edge, associated to a terminal 300 comprising a rigid tubular portion 302 extending for a length substantially equal to the length of the awning and adapted to maintain the latter constantly tensioned during the displacement thanks to its weight.

[0031] The terminal 300 also comprises end portions 304, coupled to each end of the tubular portion 302, and adapted to allow the terminal 300 to be associated to and slide along the guides 200 with a movement that leads selectively to one between a position in which the awning is wound around the take-up roller and a position in which the awning is extended. Specifically, when the terminal 300 is in the position wherein the awning is extended, the end portions 304 are adjacent to the respective stop section 204 of the guides 200, that is, they are substantially at the same height with respect to the base plane of the awning structure. The awning is displaced between the two positions, preferably in an automatic mode, thanks to the main displacement means of the winding mechanism (non shown), such as a main electric motor connected in a known manner to the winding roller and driven with known means, such as for example an electric circuit controlled by push buttons. Alternatively, the awning can be displaced between the two positions in the manual mode with suitable main driving means of the winding mechanism, such as for example transmission means driven through a crank.

[0032] In this preferred embodiment, each of the guides 200 comprises a profile member, preferably metallic, provided with a vertical slit 202 that is slidably engaged by the respective end portion 304 of the terminal 300.

[0033] Specifically, in this preferred embodiment, each end portion 304 comprises a cap 306 and a cursor element 308. The cap 306 is adapted to close the respective base of the tubular portion 302 of the terminal 300 and to fix itself thereto with fastening means, such as screws, or by interlocking, and is provided also with a through hole. The cursor 308 can be fixed to the cap 306 with fastening means, such as screws, and is adapted to slidably engage the slit 202 of the respective guide 200.

[0034] The locking system 100 according to the present invention is adapted to reversibly block the end portions 304 of the terminal 300 at the stop sections 204 of the guides 200 when the awning is in the extended position and, subsequently, to tension the latter by winding it around the winding roller, as will be explained later.

[0035] Specifically, the locking system 100 comprises first coupling means 400, associable to a respective end portion 304 of the terminal 300, that cooperate with second coupling means 500, associable to the respective stop section 204 of the guides 200. The first coupling means 400 each comprise an engaging element 402 adapted to move between a first position, in which the end portion 304 of the terminal 300 can slide freely along the respective guide 200, and a second position in which they cooperate, that is, interfere, with an abutting element 502 of the respective second coupling means 500 to obtain the reversible blocking of the awning in the extended position. In this state, afterward, the tensioning of the awning is achieved by winding the same around the winding roller, as will be explained later.

[0036] With reference to Figs. 4, 5 and 6, the first coupling means 400 each comprise a shell 404 containing the respective engaging element 402 which is movable by means of an axial translation of the same between said first position, in which it is at least partially retracted into the shell 404 (see Fig. 4) so as not to cooperate with the respective abutting elements 502 of the second coupling means 500, and said second position, wherein it is at least partially projecting from the shell 404 (see Figs. 5 and 6) so as to be adapted to cooperate with the respective abutting elements 502 of the second coupling means 500 to achieve the reversible blocking of the awning in the extended position,

[0037] Specifically, the engaging element 402 is formed from a pin that is axially slidable thanks to the action of an actuator 406, such as for example an electric actuator comprising a motor, and thanks to a force exerted by an elastic recovery element 408, such as a compression spring. Specifically, the elastic recovery element 408 is adapted to urge the displacement of the engaging element 402 to the first position by means of a force generated by its elastic deformation. The actuator 406 is provided with transmission means of known type, such as for example a lead nut that meshes with a screw, and is adapted to assume alternatively a first retraction state and a second extension state. In the retraction state, the engaging element 402 is urged only by the elastic recovery element 408, which tends to displace it to the first position; instead, in the extension state the engaging element 402 is displaced to the second position through the transmission means 410 so as to overcome the countering force of the elastic recovery element 408.

[0038] Moreover, the first coupling means 400 comprise, preferably inside the shell 404, respective first actuating means 412, such as for example a magnetic switch, adapted to interact with respective second actuating means 504, such as for example preferably a neodymium magnet, comprised in the second coupling means 500. Specifically, the first actuating means 412 and the second actuating means 504 are adapted to interact with each other, when adjacent to and at a given relative position, so as to trigger the variation of state of the actuator 406 from the retraction state to the extension state, as will be explained later.

[0039] The first coupling means 400 are contained in the tubular portion 302 of the terminal 300 and are fixed to the cap 306 of the respective end portion 304 through fastening means, such as screws, so that the engaging element 402 of the first coupling means 400 is adapted to slidingly engage the hole of the respective cap 306 during its displacement between the first position and the second position. Power supply means, such as a battery (not shown in the figures), and any further control means for coordinating both the first coupling means 400, such as a printed circuit board (not shown in the figures), are preferably contained inside the tubular portion 302 of the terminal 300 and are connected to each actuator 406 to enable their operation.

[0040] The second coupling means 500 comprise a slidable body 506 of substantially parallelepiped shape which is provided with an abutting element 502 integral to the same, such as a plate. The abutting element 502 extends horizontally from a portion of the slidable body 506, which is operatively adapted to face the respective end portion 304 of the terminal 300. In addition, the second coupling means 500 comprise the respective second actuating means 504, such as preferably a neodymium magnet, which, as mentioned earlier, are adapted to interact with the first actuating means 412 of the first coupling means 400 so as to trigger the variation of state of the actuator 406 of the first coupling means 400 from the retraction state to the extension state.

[0041] In the present invention, advantageously, the second coupling means 500 are slidably associated to the respective stop sections 204 of the guides 200. Specifically, in this embodiment, the stop sections 204 are lower end portions of the guides 200 and include cavities, closed at the bottom by respective bases 206, that receive the respective coupling means 500 so as to allow the sliding of the same along the direction of the guides 200. Specifically, the sliding of the second coupling means 500 takes place inside the cavities of the stop sections 204 through guide means 208, such as a track, that are formed on the walls of the respective stop sections 204 and that also extend, parallel to the direction of the guides 200.

[0042] Advantageously, each of the stop sections 204 comprises at least a respective elastic retaining element 210 fixed to the stop section 204 so as to limit and oppose the displacement of the respective second coupling means 500. Specifically, the elastic retaining element 210 limits the sliding of the respective second coupling means 500 between an inactive position, in which the latter are preferably in abutment on the base 206 of the respective stop section 204, and a retaining position, in which the second coupling means 500 are spaced from the respective base 206, that is, they are lifted, and wherein the respective elastic retaining element 210 applies a force that opposes the lifting of the second coupling means 500.

[0043] In this preferred embodiment, the elastic retaining element 210 comprises a stop element 212 and an elastic opposing element 214, such as a compression spring that is interposed between the second coupling means 500 and the respective stop element 212. Specifically, the stop element 212 is fixed with fastening means, such as screws, on the track 208 of the stop section 204 in a position higher than the second coupling means 500. Preferably, the elastic opposing element 214 is fixed by means of interlocking on the upper surface of the respective second coupling means 500 and is, moreover, adapted to abut against the lower surface of the respective stop element 212. However, this selection is not limitative, and it is possible to provide an embodiment in which the elastic opposing element 214 is fastened to the lower surface of the stop element 212 and adapted to abut against the respective second coupling means 500. Alternatively, the elastic opposing element 214 is in abutment against or is fixed to both the respective second coupling means 500 and the stop element 212.

[0044] The operation of the locking system 100 according to the present invention will be described with reference to Figs. 4, 5 and 6.

[0045] In Fig. 4 is shown the locking system 100 in a free sliding position: as can be seen, the engaging elements 402 are in the first position and, consequently, the end portions 304 of the terminal 300 are free to slide along the guides 200 thanks to the actuation of the main electric motor of the awning structure to unwind or wind the awning according to the requirements of the user. Specifically, the engaging element 402 is substantially retracted into the shell 404 of the first coupling means 400 since the actuator 406 is in the first retraction state and the elastic recovery element 408 urges the displacement of the engaging element 402 to the first position, thus bringing it into abutment against the transmission means 410. The second coupling means 500 are, instead, in the inactive position, that is, in abutment on the base 206 of the respective stop section 204.

[0046] In Fig. 5 is shown the locking system 100 in a first operating phase for locking the awning, during which the engaging element 402 passes from the first position to the second position by means of the change of state of the actuator 406 from the retraction state to the extension state.

[0047] This operation is achieved automatically when the first actuating means 412 and the second actuating means 504 interact with each other. In particular, in this embodiment, this operation is carried out when the first actuating means 412 and the second actuating means 504 are adjacent to each other and at a distance in which, when the awning is unwound, the engaging element 402 moves operatively past the respective abutting element 502. In other words, the engaging element 402 goes from the first position to the second position when it is at a lower height than the corresponding abutting element 502 with respect to the base plane of the awning structure: the magnetic interaction between the two actuating means triggers the change of state of the actuator 406 from the first retraction state to the second extension state. Specifically, the engaging element 402 projects from the shell 404 of the first coupling means 400 since the actuator 406 is in the second extension state wherein the transmission means 410 urge the engaging element 402 to the second position, overcoming the opposing force of the elastic recovery element 408.

[0048] Subsequently, the main electric motor of the awning structure recalls the terminal 300 back in the awning winding direction (indicated in the figure with a thick arrow W); consequently, the engaging elements 402 of the first coupling means 400, integral with the terminal 300, are recalled upward until they abut against the abutting elements 502 of the respective second coupling means 500.

[0049] In Fig. 6 is shown the locking system 100 in a second operating phase for locking the awning, during which the engaging element 402 remains in the second position and the state of the actuator 406 is switched from the extension state to the retraction state. In addition, during the second operating phase for locking the awning, the second coupling means 500 are lifted to the retaining position in which the engaging elements 402 of the first coupling means abut against the abutting elements 502 of the second coupling means 500.

[0050] Specifically, when the engaging elements 402 abut on the respective abutting elements 502, that is, they cooperate with them, the main electric motor of the awning structure continues to recall the terminal 300 back in the awning winding direction W. Consequently, the second coupling means 500 are spaced from the respective bases 206, that is, they are lifted, to a retaining position where the respective elastic retaining elements 210 apply a force L, induced by the loading of the respective opposing elastic element 214, which counters the lifting of the second coupling means 500. The force L, which therefore has a direction opposite to the awning winding direction W, is applied to the contact region between the engaging elements 402 of the first coupling means 400 and the abutting elements 502 of the second coupling means 500 (in the figure, the force L is indicated with a thick hatched arrow).

[0051] In this state, the actuator 406 is subsequently brought to the first retraction state and the friction generated by the force L, between the abutting element 502 and the engaging element 402, counters the force applied by the elastic element 408 which remains compressed, that is, elastically deformed, and is not capable of urging the displacement of the engaging element 402 to the first position which, therefore, remains in the second position.

[0052] At this point, the awning is locked in the extended position and it may be subjected to a stronger traction, by winding it, to increase its resistance to external stresses.

[0053] To unlock the terminal 300, the main electric motor of the structure is activated by unwinding the awning, or by applying manually on it a slight downward pressure, so as to lower the terminal 300 in the direction opposite to the direction W until the elastic retaining elements 210 cease to apply the force L.

[0054] In this state, the friction generated by the force L, between the abutting elements 502 and the engaging elements 402, is canceled out, in other words it is exceeded by the force applied by the elastic recovery element 408, which is in the compressed state. Consequently, since the actuator 408 is in the first, or retraction state, the engaging element 402 is brought to the first position by the elastic recovery element 408. Hence, the first coupling means 400 stop cooperating with the respective second coupling means 500, which are brought back into abutment on the respective bases 206, that is are lowered by the effect of their own weight.

[0055] Advantageously, with this configuration, the locking system 100 according to the present invention guarantees, at some moment following the locking of the terminal 300, the maintenance of a tensioning of the awning, compensating for any deformation of the latter, that is, following a deformation of the material with which it is formed.

[0056] In fact, a friction is maintained between the engaging elements 402 of the first coupling means 400 and the respective abutting elements 502 of the second coupling means 500 when the material used for making the awning is deformed, or stretched, in the conditions of use. Consequently, the end portions 304 of the terminal 300 remain locked at the stop sections 204 of the guides 200.

[0057] Specifically, when there is a deformation of the material used for making the awning, the second coupling means 500 are displaced closer to the respective bases 206, that is, they are lowered, by the force L exerted by the respective elastic retaining elements 210, which also maintains a friction between the engaging elements 402 and the respective abutting elements 502. In other words, advantageously, the elastic retaining elements 210 of the stop sections 204 displace the second coupling means 500 so as to maintaining them engaged by the first coupling means 400, compensating the deformation of the awning, or of the material used for making the same.

[0058] If necessary, as the degree of deformation of the material used for making the awning further increases, the elastic retaining elements 210 continue to displace the second coupling means 500, compensating for the deformation of the awning, and the engaging elements 402 of the first coupling means 400 continue to cooperate with the respective abutting elements 502 of the second coupling means 500 until when the friction generated by the force L is exceeded by the force applied by the elastic recovery element 408, which is in the compressed state (defined as friction threshold limit). When the friction is below the threshold limit, therefore, the engaging elements 402 are brought to the first position, unlocking the terminal 300.

[0059] Furthermore, advantageously, the elastic retaining elements 210 of the stop sections 204 maintain engaged with each other the first coupling means 400 and the second coupling means 500, compensating for a possible displacement of the terminal 300 due to a deformation of the awning caused by an external stress, such as for example the wind that impacts the awning transversally with a relatively high force.

[0060] Furthermore, advantageously, in the present invention the elastic retaining elements 210 of the stop sections 204 maintain engaged with each other the first coupling means 400 and the second coupling means 500, compensating for a possible asymmetric deformations of the awning that caused asymmetric displacements of the terminal 300 at each of the two stop sections 204 of the respective guides 200.

[0061] According to a further advantageous aspect of the present invention, it is possible to provide an adjustable fastening of the stop element 212 on the stop section 204 so as to adjust the retaining characteristics of the elastic retaining element 210. Specifically, by adjusting the fastening of the stop element 212 on the guide means 208 of the stop section 204, for example by means of sliding and fastening seats, it is possible to adjust the displacement interval of the second coupling means 500 and/or to adjust the characteristics of the respective elastic retaining element 210, such as the dimension and/or the elastic constant, to ensure a suitable locking of the terminal 300 based on the characteristics of the structure and of the awning itself.

[0062] Moreover, advantageously, it is possible to offset any differences in height of the stop sections 204 of the guides 200 that are due, for example, to a plane at the base of the awning structure that is not perfectly horizontal.

[0063] It is clear that the present invention can be implemented in other embodiments without departing from the claimed subject matter.

[0064] Below is described a second embodiment of the present invention that contemplates changes in relation to some previously described elements of the locking system. Thus, the elements that carry out the same functions will not be described anew and the same preceding numerical references will be used, preceded by the numeral "1".

[0065] With reference to Figs. 7, 8, 9 and 10, a locking system 1100 is shown for awning structures, in a second preferred embodiment, wherein lateral guides 1200 are each provided with a cable, preferably of plastic or metallic material, along which slides a respective end portion 1304 of the terminal 1300.

[0066] Specifically, in this embodiment, the end portion 1304 comprises a cap 1306 and a cursor element 1308 provided with an opening adapted to slidably engage the cable of the respective guide 1200. The cursor element 1308 is formed integral with the cap 1306, although it is possible to provide an embodiment in which it is fixed thereto by means of fastening means, such as screws.

[0067] The guides 1200 are provided with respective stop sections 1204, or lower end portions, that have a different structure from the one described in the first embodiment.

[0068] Specifically, the stop sections 1204 include a jacket 1216 of box-like shape, open at the top, that is provided with a base 1206 integral to the same. The guides 1200, that is, the cables, are fastened to the base 1206 of the respective stop sections 1204, by being, for example, wedged-in by interference or by welding, through respective connecting portions 1218 making, therefore, the bases 1206 and the respective guides 1200 integral with each other. In addition, the stop sections 1204 include, within the jacket 1216, respective guide means 1208, such as for example two threaded bars, that are fastened to the respective base 1206 substantially parallel to the direction of the guides 1200.

[0069] In this second embodiment, the second coupling means 1500 comprise a slidable body 1506 substantially of parallelepiped shape that is provided with an abutting element 1502 integral to it, such as a plate. The abutting element 1502 extends horizontally from a portion of the slidable body 1506 that is operatively adapted to face the respective end portion 1304 of the terminal 1300. Moreover, the second coupling means 1500 include the respective second actuating means 1504, such as a magnet, preferably for example a neodymium magnet, which, as in the first embodiment, is adapted to interact with the first actuating means 1412 of the first coupling means 1400 when they are adjacent to each other and at a given relative position, so as to prime the switch of state of the actuator 1406 of the first coupling means 1400 from the retraction state to the extension state.

[0070] As in the first embodiment, advantageously, the second coupling means 1500 are slidably connected to the respective stop sections 1204 of the guides 1200. Specifically, in this embodiment, the jackets 1216 of the stop sections 1204 receive the respective second coupling means 1500 so as to allow the sliding of the latter in the direction of the respective guide means 1208, that is, in the direction of the guides 1200. Specifically, in this embodiment, the second coupling means 1500 are associated to the respective guide means 1208 through holes that are formed on the second coupling means 1500 and that are adapted to be fittingly and slidably engaged by the respective guide means 1208.

[0071] As in the first embodiment, advantageously, each of the stop sections 1204 comprises at least one respective elastic retaining element 1210 fixed to the stop section 1204 so as to limit and oppose the displacement of the respective second coupling means 1500. Specifically, each elastic retaining element 1210 limits the sliding of the respective second coupling means 1500 between an inactive position, in which they are preferably in abutment against the base 1206 of the respective stop section 1204, and a retaining position, wherein the second coupling means 1500 are spaced from the respective base 1206, that is, lifted, and in which the respective elastic retaining element 1210 applies a force that opposes the lifting of the second coupling means 1500.

[0072] In this embodiment, each of the stop sections 1204 comprises two elastic retaining elements 1210, each of which includes a stop element 1212 and an elastic opposing element 1214, such as a compression spring, that is interposed between the second coupling means 1500 and the respective stop element 1212. Specifically, the elastic opposing element 1214 is slidably associated to the respective guide means 1208 on whose upper ends are fixed the respective stop elements 1212, such as nuts, that thus are arranged above the respective second coupling means 1500. Preferably, the elastic opposing element 1214 is fixed by means of interlocking on a projection provided on the upper surface of the respective second coupling means 1500 and is, moreover, adapted to abut against the lower surface of the respective stop element 1212. However, this choice is not limitative, and it is possible to provide an embodiment in which the elastic opposing element 1214 is fastened to the lower surface of the stop element 1212 and adapted to abut against the respective second coupling means 1500. Alternatively, the elastic opposing element 1214 is in abutment against or fixed to both the respective second coupling means 1500 and the stop element 1212.

[0073] Moreover, preferably, each of the stop sections 1204 comprises respective supporting elastic element 1220 on which the second coupling means 1500 rest when they are in the inactive position. Specifically, the supporting elastic elements 1200 are slidably associated to the respective guide means 1208 so as to be in abutment against the second coupling means 1500 and the respective base 1206. In other words, the second coupling means 1500 abut against the respective bases 1206 through the respective supporting elastic elements 1220, which are adapted to slow down, or dampen, the approach of the coupling means 1500 to the respective bases 1206 when, for example, the terminal 1300 is unlocked.

[0074] The operation of the locking system 1100 according to the second embodiment is similar to the one of the first embodiment, previously described with reference to Figs. 4, 5 and 6.

[0075] Specifically, in Figs. 9 and 10 is shown the locking system 1100, according to the second embodiment, in a second operating phase for locking the awning, similar to the one previously described in the first embodiment with reference to Fig. 6. During the second operating phase for locking the awning, the engaging element 1402 remains in the second position and the state of the actuator 1406 is switched from the second state - extension - to the first state - retraction.

[0076] Specifically, when the engaging elements 1402 of the first coupling means 1400 abut against the abutting elements 1502 of the second coupling means 1500 the main electric motor of the awning structure recalls the terminal 1300 in the awning winding direction W. Consequently, the second coupling means 1500 are moved away from the respective bases 1206, that is, they are lifted, to a retaining position in which the respective elastic retaining elements 1210 apply a force L, induced by the loading of the respective opposing elastic element 1214, which opposes the lifting of the second coupling means 1500. The force L, which therefore has a direction opposite to the awning winding direction W, is applied to the contact region between the engaging elements 1402 of the first coupling means 1400 and the abutting elements 1502 of the second coupling means 1500.

[0077] In this state, the actuator 1406 is brought to the first state of retraction, and the friction generated by the force L, between the abutting elements 1502 and the engaging elements 1402, opposes the force applied by the elastic recovery element 1408, which remains compressed, that is, elastically deformed, and is not capable of urging the displacement of the engaging element 1402 to the first position, which, therefore, remains in the second position.

[0078] At this point, the awning is locked in the extended position and it may be possible to submit it to a greater traction, by winding it, to increase its resistance to external stresses.

[0079] Like in the first embodiment, to unlock the terminal 1300 the main electric motor of the structure is activated by unwinding the awning, or by applying manually on the terminal a slight pressure downward, so as to lower the terminal 1300 in the direction opposite the direction W, until the elastic retaining elements 1210 stop applying the force L.

[0080] In this state, the friction generated by the force L, between the abutting elements 1502 and the engaging elements 1402, is canceled out, that is, it is exceeded by the force applied by the elastic recovery element 1408 which is in the compressed state. Consequently, since the actuator 1406 is in the first retraction state, the engaging element 1402 is brought to the first position. Therefore, the first coupling means 1400 cease to cooperate with the respective second coupling means 1500, which are brought into abutment on the respective bases 1206, that is, they are lowered by the effect of their own weight.

[0081] It is evident that it is possible to provide additional embodiments without departing from the scope of the claimed characteristics.

[0082] For example, in the previously described embodiments, the awning comprises a flexible sheet made of a plastic or fabric material, which is wound around a winding roller during the operations of displacing the structure in which the awning is wound and unwound. However, it is possible to provide an awning comprising belts that connect to each other the terminal and the roller on which they are wound during the operations of displacing the awning. Specifically, the belts are adapted to support one or more sheets or strips that form the surface of the awning and that are gathered up by pleating or creasing when the belts are wound around a roller. In this state, advantageously, the locking system of the present invention compensates for the deformation of the belts of the awning, or of the material used to make the same.

[0083] Moreover, in the previous description the locking system 1100 in the second embodiment includes supporting elastic elements 1220 on which the second coupling means 1500 rest; however, it is possible to provide a locking system 100, similar to the one of the first embodiment, comprising supporting elastic elements 1220 on which rest the second coupling means 500 and having the same function.

[0084] Further, in the foregoing description the locking system in the first and in the second embodiment comprises at least an elastic retaining element 210 comprising an opposing elastic element 214, such as a compression spring. However, it is possible to provide an embodiment in which the elastic retaining element 210, or the opposing elastic element 214, includes a gas piston that applies a force L when it is compressed.

[0085] In addition, in the foregoing description the elastic retaining element comprises a stop element and an opposing elastic element, such as a compression spring, that is interposed between the second coupling means and the respective stop element. However, it is possible to provide an embodiment in which the elastic retaining element comprises an opposing elastic element, such as a tension spring, that is interposed between and fixed to the base of the respective stop section and to the corresponding second coupling means so as to apply a force that opposes the lifting of the latter.

[0086] Moreover, in the foregoing description the locking system is of automatic type that provides an electric actuator comprising a motor; however, it is possible to provide an embodiment in which the actuator can be activated manually. In this embodiment, for example, the actuator is provided with transmission means that are activated manually, such as a cursor adapted to move slidingly, and such transmission means may be integral to the respective engaging elements.

[0087] Moreover, in the preceding description the elastic retaining elements can be fixed to the respective guide means; however, it is possible to provide an embodiment in which the elastic retaining elements can be fixed to any portion of the respective stop section so as to limit and oppose the lifting of the respective second coupling means.

[0088] From the above, it is clear that the locking system according to the present invention attains the purposes and advantages. Specifically, the locking system for awning structures guarantees, at a moment following the locking of the terminal, the maintenance of a tensioning of the awning even following the deformation of the same or of the material with which it is formed.

[0089] Furthermore, the locking system according to the present invention compensates for the deformation of the awning and maintains the friction between the surface of the abutting elements and the respective engaging elements so as to maintain the latter in the second projecting position even when the actuator that moves them is brought operatively to the first retraction state.

[0090] Moreover, the locking system according to the present invention is sturdy and simple to design, without requiring particular devices, and can be adapted to different types of roller awning structures.

[0091] Finally, the locking system according to the present invention can be achieved by means of normal plants, machinery and equipment.

[0092] Naturally, the materials and the equipment used to implement the present invention, as well as the shape and dimensions of the individual components, can be the most suitable for the specific requirements.

Claims

1. Locking system (100,1100) for roller awning having a first edge fixed to a winding mechanism and a second edge associated to a terminal (300,1300) whose end portions (304,1304) are adapted to slide along guides (200,1200) to move said awning between a wrapped position and an extended position wherein said end portions (304,1304) are adjacent to a respective stop section (204,1204) of said guides (200,1200),
said locking system (100,1100) comprising first coupling means (400,1400) associable to the respective end portions (304,1304) of the terminal (300,1300) and each comprising an engaging element (402,1402) adapted to move between a first position, wherein said end portions (304,1304) can slide along said guides (200,1200), and a second position, wherein said engaging element (402,1402) cooperates with a respective abutting element (502,1502) of second coupling means (500,1500) associable with the respective stop section (204,1204) for reversibly locking said awning in said extended position and applying a tensioning thereof by winding the awning along a direction (W),
said first coupling means (400,1400) each further comprising an elastic recovery element (408,1408) adapted for urging the displacement of said engaging element (402,1402) in said first position, and an actuator (406,1406) adapted to move said engaging element (402,1402) into said second position overcoming the force of said elastic recovery element (408,1408),
characterized in that
said second coupling means (500,1500) are slidingly associable to the respective stop section (204,1204) along the direction of said guides (200,1200) between an inactive position when said engaging element (402,1402) is in said first position, and a retaining position when said engaging element (402,1402) is in said second position and cooperates with the respective abutting element (502,1502), and said stop section (204,1204) comprising at least an elastic retaining element (210,1210) which applies a force (L) to the respective second coupling means (500,1500) when the latter are in said retaining position, said force (L) having direction opposite to the direction (W) of winding.

2. Locking system (100,1100) for roller awning according to claim 1, wherein said elastic retaining element (210,1210) comprises a stop element (212,1212) operably fixable to said stop section (204,1204), and an elastic opposing element (214,1214) adapted to cooperate with said stop element (212,1212) and with the respective second coupling means (500,1500).

3. Locking system (100,1100) for roller awning according to claim 2, wherein the fixing position of said stop element (212,1212) is adjustable along a direction parallel to said guides (200,1200).

4. Locking system (100,1100) for roller awning according to any of claims 1 to 3, wherein said stop section (204,1204) integrally comprises guiding means (208,1208) parallel to the direction of said guides (200,1200) and along which the respective second coupling means (500,1500) slide, and
said elastic retaining element (210,1210) being fixable to said guiding means (208,1208).

5. Locking system (100,1100) for roller awning according to any of claims 1 to 3, wherein said stop section (204,1204) integrally comprises guiding means (208,1208) parallel to the direction of said guides (200,1200) and along which the respective second coupling means (500,1500) slide, and
said elastic retaining element (210,1210) being fixable to said stop section (204,1204).

6. Locking system (100) for roller awning according to any of claims 4 or 5, wherein said guide (200) is a profile provided with a slit (202) adapted to be slidably associated to the respective end portion (304) of the terminal (300),
said stop section (204) being a lower end portion of the respective guide (200) comprising a cavity adapted to slidably receive the respective second coupling means (500), and
said guiding means (208) being at least a track along which the respective second coupling means (500) slide.

7. Locking system (1100) for roller awning according to any of claims 4 or 5, wherein said guide (1200) is a cable slidably associated to the respective end portion (1304) of the terminal (1300),
said stop section (1204) comprising a jacket (1216) adapted to slidably receive the respective second coupling means (1500), and
said guiding means (1208) being at least a rod along which the respective second coupling means (1500) slide.

8. Locking system (100,1100) for roller awning according to any of claims 1 to 7, wherein said second coupling means (500,1500) rest on at least a supporting elastic element (1220) when they are in said inactive position.

9. Locking system (100,1100) for roller awning according to any of claims 1 to 8, wherein said actuator (406,1406) is adapted to alternatively assume a first state, wherein said engaging element (402,1402) is urged by a force of said elastic recovery element (408,1408), and a second state wherein said engaging element (402,1402) is moved into said second position, and
said first coupling means (400,1400) and said second coupling means (500,1500) comprising respectively first actuation means (412,1412) and second actuation means (504,1504) adapted to interact with each other to drive said actuator (406,1406) so that said engaging element (402,1402) automatically moves into said second position when, by unwinding the awning, it operationally goes beyond the respective abutting element (502,1502), and so that said actuator (406,1406) achieves the first state when said engaging element (402,1402) is in said second position and cooperates with the respective abutting element (502,1502).

10. Roller awning comprising a locking system (100,1100) according to any of claims 1 to 9.

Drawing