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(11) | EP 0 911 460 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
| published in accordance with Art. 158(3) EPC |
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| (54) | ARTICULATED ARM FOR SUPPORTING AWNINGS |
| (57) The arm is comprised of a first (10) and second (11) tubular sections connected by
a hinge (12) which comprises a cylindrical core (13) with an axial orifice receiving
a shaft connected at its extremities to lugs (15, 15a) between which the core (13)
rotates. Members (16, 17) extend from the core (13) and from the lugs (15, 15a) and
join the sections (10, 11) oriented with an angle with respect to the plane normal
to the axis of the hinge (12). The first section (10) houses a traction spring attached
by a flexible element, resting on the core (13), to the second section (11). Said
flexible element is comprised of a planar plastic built (18, 40) with internal metal
reinforcement filaments (18a, 40a), and integrates in its two extremities, which are
conformed by casting or injection molding, both metal terminals (19, 20) in order
to join the belt (18, 40) to the traction spring at one extremity and to the second
arm (11) at the other extremity. |
[0001] The present invention relates to an articulated arm for supporting awnings, which comprises two elements constituted by a first and a second tubular profiles connected to each other by a hinge comprising a cylindrical core with an axial orifice to arrange the shaft of the hinge, the ends of which are linked to two lugs, among which said core has a clearance and socketing members to said profiles starting from respectively these core and lugs. In order to guarantee a gap between the hinge and arms with regard to the canvas of the awning to facilitate its folding over, said tubular profiles constituting the articulated arms form an angle with respect to this hinge shaft normal plane, a traction spring being housed within the first profile the former being joined by means of a flexible element of the traction transmission which is supported on said core, with the second tubular profile.
[0002] As background of the invention we can mention the utility model DE-U-8700527 (LOSBERGER) and patents DE-A-39 00 463 (KRALER) and FR-A-2708019 (LLAZA), which disclose different variants of embodiment of an arm having general characteristics mentioned with the peculiarity that the flexible element transmitting the traction is constituted by a planar strip or band which in the embodiment of said patent FR-A-2708019 is of plastic material and is interiorly provided with lengthwise and parallel metal filaments as reinforcements.
[0003] In said background a problem which arises from the use of a flexible band as traction transmitting element, alternative to the traditional chain or cable, stands in the form of constituting the join of said flexible band with, on one side the end of the traction spring or of an element linking with it, housed in one of the half-arms and on the other side, with the other half-arm, which is overcame, for example in DE-A-3900463 by forming a loop at the ends of the band to which a hooking ring is associated and in general in referred background by means of an end loop passing through an eyelet having an oblong hole or the like. Such solution has the drawback that said loop has to be formed at the band ends, a loop the ends of which must be tightly linked to the band itself with the risk of weakening it, in the event of piercing or welding and demanding complicated operations.
[0004] This invention offers, with respect to said backgrounds, the peculiarity of a special constitution of said traction transmitting flexible mean which embodies some terminals integral with said band, specially effective to associate the two tubular profiles forming each arm, as well as means defined in the hinge itself, to orientate said band lengthwise centered with respect to the profile housing the traction spring.
[0005] More concretely and according to the technical rule of this patent, said flexible element includes, at its two ends and advantageously injection shaped, both metal ends to join the band to the traction spring arranged within a first tubular profile (half-arm) and the second profile (half-arm) respectively. Said terminals made of a ductile and resistent material for example zamak, are unified with the ends of said metal filaments, protruding from said two ends, prior to the injection. In order to increase said ends joining the filaments, it has been foreseen to fold them, by their ends, before performing the injection, preventing thus any risk of further sliding of said end threads of the terminal, when stretching the band.
[0006] One of said metal terminals, having a cylindrical shape is arranged embedded in a housing shaped on the side wall of the hinge cylindrical core, close to the starting of the member for socketing to related second tubular profile (not provided with spring), and said housing adopts an inclined orientation with respect to the hinging axis, so that the flexible band which starts from said metal terminal is orientated lengthwise centered with respect to the first profile which houses the traction spring. So the use of specific shifting means is prevented for orienting centerwise the traction means, as it is disclosed at said patent DE-A-39 00 463.
[0007] In order to make flexible band resistent to weathering, in particular sun radiation, it is made of plastic extruded on filament core, incorporating a component stabilizing said plastic with regard to ultraviolet radiation.
[0008] Said tubular profiles possess in addition a configuration favorable to their folding minimizing the clearance and with a very beautiful external appearance.
[0009] The applicant could check in addition, that in several tests carried out with referred arm for awnings and namely with the flexible band it integrates, that although the injection molding of a metal material provides very favorable results, it is possible to use likewise other materials such as plastic, in the event that the requirements of the stresses, because of the type of arm span is less, and to use the technology of casting in the larger sense, molding not only on the end portion but also on areas close, just near to said end.
[0010] It results also advantageous, as an alternative to strip the band metal threads, and their potential folding or hook-like deforming, to fold the band itself in bordering sectors at its two ends, backing the ends of said band against a face of the band itself, through crushing and forming a loop, which could be susceptible to protrude from the molded part, in whose case said configuration can allow the arrangement through said loop of a stem or shaft, depending on the locking or seizing element to join the ends of the band to referred traction spring and half-arm, respectively.
[0011] Are also characteristics of the arm this model refers to, the configurations of coupling between the socketing members and the mentioned tubular profiles which allow to achieve a rigid and stable linking with the arms.
[0012] In order to facilitate the explanation, three sheets of drawing are attached to this specification, in which an example of embodiment for indicative and no limitative example purpose of the articulated arm for awnings involved.
[0013] In the drawings:
Fig. 1 is an elevation view from inside the hinge between the two elements or tubular profiles (illustrated in all the figures in stroke line) constituting each arm.
Fig. 2 is a plan view of said hinge, with part undercutting of one of the lugs, a cover to close the housing designed to house one of the terminals of the flexible band used having been also shown cross-split.
Fig. 3 is an elevation view, from outside of the hinge with illustration of the arrangement and orientation of said flexible band.
Fig. 3a is a part view, in detail and enlarged, of said housing to house a terminal of said band in one of the half-parts of the hinge.
Fig. 4 and 5 illustrate in elevation view and profile said flexible band, of plastic, with parallel internal filaments, provided with its two end terminals.
Fig. 6 and 7 illustrate a plan and elevation view of a terminal part molded on a end of a flat, flexible band, with internal reinforcement threads, the molding of which can be carried out by technology of casting or injection.
Fig. 8 and 9 are plan and elevation views, respectively, which show an alternative embodiment to that of figures 6 and 7, of union of a terminal part molded on the end of the flat, flexible band, with longitudinal internal reinforcement threads.
[0014] On the other side, at Fig. 10 and 11, plan and elevation views have been drawn of a terminal part molded on a part close to the end of a flat, flexible band having reinforcement threads.
[0015] Last, figure 12 is a cross section of the two tubular profiles constituting the arms, in folding position, directly facing each other, showing the arrangement, socketed within it, of the union members which start from the two parts forming the hinge and locking configurations have been illustrated in details to guarantee the stability of the socketing.
[0016] According to said drawings, the invention is applied to articulated arms of the type which is constituted by a first (10) and a second (11) tubular profiles, or half-arms, connected to each other by a hinge (12) which comprises a cylindric core (13) with an axial orifice for arranging the hinge shaft (14), the ends of said shaft are linked to two lugs (15, 15a), between which said core (13) has a clearance in rotation, from said core (13) and lugs (15, 15a) start members (16, 17) socketing with said profiles (10, 11). Said profiles (10, 11) form, according to a typical framework already commented, an angle with respect to the normal plane of the shaft of said hinge, a traction spring housing itself within the first profile (10), joined by means of a flexible traction transmission element, with support on said core (13), with the second tubular profile (11), the flexible element being constituted by a planar band (18), for example of plastic provided inside with metal reinforcement filaments (18a). An arm having said characteristics appears disclosed in said patent FR-A-2708019.
[0017] According to the invention, said flat band (18) includes at its two ends and injection shaped, metal terminals (19, 20) to join the band (18) to the traction spring associated to the first arm (10), by a first end and the second arm (11) at the other end, respectively. The terminals (19, 20) are unified with the ends of said metal filaments (18a), protruding from the two ends of the band (18) when performing the injection, preferentially doing in addition some folds at each of the ends free of said filaments (18a) previously to the injection of related terminals (19, 20) on the end portions of the band (18), in order to increase the force of seizing them to the injection material mass and preventing that they can slide when said terminals act under traction.
[0018] As it can be seen in figures 3 to 5, one of the metal terminals (19) of the flexible band (18) adopts a cylindrical configuration, for arrangement and retention in related housing (21) the characteristics of which are detailed thereafter. The terminal (19) is extended at its two ends by stubs (22, 22a). On its side the second metal terminal (20) adopts a plane configuration with at least one eyelet (25) to be fixed with the traction spring topped by a hook or similar linking element.
[0019] With reference to the figures 3 and 3a, in same one can see that the terminal (19) is arranged embedded in a housing (21) shaped on the side wall of the core (13), close to the starting of the member (17) socketing at related second profile (11), the housing (21) of which adopts an inclined orientation with respect to the shaft (14) of the hinge (12) so that the flexible band (18) starting from the terminal (19) is oriented longitudinally centered with respect to the first profile (10) which houses the traction spring. Said housing (21) includes an undercutting delimited by two parallel walls with two sectors (21a, 22a) susceptible to house two end portions of the cylindrical element (19) (the portions where the stubs (22, 22a) are established and a central opening (26), in the farthest wall (35) from the member (17) joining to the second arm (11), having a sufficient width to allow a band (18) passing through it. The band (18) is supported on the external surface of the cylindrical core (13) which in addition shows a portion (13a) delimited by raised flanks (37) for guiding and centering said band (18).
[0020] In fig. 2, a cover (23) appears illustrated with a wall-like (24) hip topped by coupling configurations (24a) which are embedded in said stubs (22, 22a) , provided for closing the housing (21) where it is superposed on it concealing the terminal (19).
[0021] In order to reinforce the wall (35) against the traction stresses brackets (36) have been provided which join said wall (35) with the cylindric core (13).
[0022] With reference to figures 6 and 7, it can be seen in said figures that the planar flexible band (40) with reinforcing longitudinal internal threads (40a) includes its folded end portion (41) shaping a fold and the end part (41a) of said fold remaining backed against the band itself (40) by crushing on its lower face (40b). On said folded end part (41) a terminal part (42) is molded by casting or injection which will serve to join the band (40) end to one of the members of the arm or to the stretched traction spring (both not shown). The orifice which remains at the fold sector (41) allows that the molding material penetrates in said area achieving an effective locking within the cast material when this later becomes solid.
[0023] In the example of fig. 8 and 9 said end part of the planar, flexible band (40), having internal reinforcement threads (40a) includes cuts which do not affect said threads (40a), and the end portions (43), (44) in which said cuts subdivide the band (40), are folded and rabated on one and the other faces of the band (40) prior to molding the end parts (45). Such an embodiment likewise offers good anchoring conditions, bearing in mind that mentioned cuts will respect the internal threads (40a) of the band (40) so that said folds (43) and (44) act as hooks within the molded body mass (45).
[0024] In fig. 10 and 11, the terminal end (46) is molded by covering a part just close to the end of the band (40), and the end portion of said band (40) shows a fold (47) shaping a loop protruding from the molded sector (46), which makes workable to have available a stem or shaft (48) through said loop, depending on the seizing element.
[0025] As an alternative to the means to constitute the seizing parts to the mass of the molded terminal part on the end of the planar band, with reinforcement threads, it was also foreseen, bearing in mind that each of the reinforcement metal threads includes a multiplicity of filaments, to leave a part of them stripped, protruding from the end of the band, prior to molding related terminal part, and it has been foreseen that from said filaments enlarged cores are shaped by deforming-compacting them.
[0026] Another potential solution to increase seizing between the end part of the band and the molded part is based in stripping reinforcement metal threads 40a of the flexible planar band 40, prior to molding related terminal part and further separating or unthreading their different filaments.
[0027] In figure 12, the structure and shape of said tubular profiles (10, 11) integrating each arm are detailed. Said tubular profiles (10, 11) adopt a shape having one of their walls (10a, 11a), oriented inwardly the awning, significantly planar, and its external wall (10b, 11b) curved-convex crowning outwardly, so that in a folded position, they shape and oval, compact and pleasant assembly. Inside both tubular profiles (10, 11) include opposite walls, a pair of longitudinal ribs (27-28, 29-30) oppositely shifted which are embedded in grooves (31, 32) pierced in one of the side faces of the socketing members (16, 17), and in steps defined by a protruding rib (33, 34) on the opposite face thereof. In order to make possible these socketing members (16, 17) locking within the tubular profiles (10, 11) said grooves (31, 32) offer an enlargement (31a, 32a) at their end portions, delimited by an inclined plane. In addition, and as it can be seen in the enlarged detail, attached to fig. 6, small protrusions (38) present on the internal wall of each tubular profile (10, 11), contribute to lock related socketing member (16, 17), by retaining it embedded within it.
1. Articulated arm for supporting awnings, which comprises two elements constituted by
a first (10) and a second (11) tubular profiles connected to each other by a hinge
(12) comprising a core (13) with an axial orifice to arrange the shaft (14) of the
hinge, the ends of which are linked to two lugs (15, 15a), among which said core (13)
has a clearance, socketing members (16, 17) to said profiles (10, 11) starting from
respectively these core (13) and lugs (15,15a), said members forming an angle with
respect to this hinge shaft normal plane, a traction spring being housed within the
first profile (10) the former being joined by means of a flexible element of the traction
transmission which is supported on said core (13), with the second tubular profile
(11), the flexible element of which is constituted by a planar band (18, 40a) internally
provided with reinforcing metal filaments (18a, 40), ChARACTERIZED in that said planar band (18, 40) integrates, at its two ends and shaped by means
of casting technology, terminals (19, 20) to join the band (18, 40) to the traction
spring associated to the first arm (10), by one end and to the second arm (11) by
the other end, respectively, said terminals (19, 20) are unified with the ends of
said metal filaments (18a, 40a), protruding at the two ends of the band (18, 40) when
casting is achieved.
2. Articulated arm, according to above claim, characterized in that the shape of said
terminals is achieved through casting molding a metal or plastic material chosen according
to the stress required for the band (10, 40).
3. Articulated arm, according to claim 1, characterized in that the shape of said terminals
is achieved by injection molding of a metal or plastic material chosen according to
the stress required for the band (10, 40).
4. Articulated arm, according to the claims 1 to 3, characterized in that at least a
fold is set at each of the ends of said filaments, prior to the molding of related
terminals, in order to increase the seizing force thereof on the injection material
mass.
5. Articulated arm, according one of the claims 1 to 3, characterized in that one of
the metallic terminals (19) of the flexible band (18, 40) has a cylindrical configuration,
for arrangement and retention in a housing (21) said terminal (19) being extended
at its two ends by stubs (22, 22a) and in that the second metallic terminal (20) adopts
a plane configuration with at least one eyelet (25) to be connected with the traction
spring.
6. Articulated arm, according one of the claims 1 to 3, characterized in that said planar
band is realized in plastic, extruded on the core of said filaments (18a, 40a), a
stabilizing component of said plastic against ultraviolet radiation having been provided.
7. Articulated arm, according to claim 5, characterized in that said cylindrical metallic
terminal (19) is arranged embedded in a housing (21) shaped on the side wall of the
core (13), close to the starting of the member (17) socketing at related second profile
(11), the housing (21) of which adopts an inclined orientation with respect to the
shaft (14) of the hinge (12) so that the flexible band (18, 40) starting from the
terminal (19) is oriented longitudinally centered with respect to the first profile
(10) which houses the traction spring.
8. Articulated arm, according to claim 7 characterized in that a cover (23) with a wall-like
(24) hip topped by coupling configurations (24a) which are embedded in said stubs
(22, 22a), has been provided for closing the housing (21) as it is superposed on the
cylindrical core (13).
9. Articulated arm, according to claim 7, characterised in that the housing (21) which
lodges said metallic terminal (19) includes an undercutting delimited by two parallel
walls with two sectors (21a, 22a) prepared to house two end portions of the cylindrical
element (19) and a central opening (26), in the farthest wall (35) from the member
(17) joining to the second arm (11), having a sufficient width to allow the band (18,
40) passing through it, said band (18, 40) being supported on the external surface
of the cylindrical core (13) which has a portion (13a) delimited by raised flanks
(37) for guiding and centering said band (18, 40).
10. Articulated arm according to claim 9, characterised in that traction stresses brackets
(36) have been provided which join the wall (35) with the cylindric core (13).
11. Articulated arm, according to claim 2 o 3, characterized in that said casting is performed
on a section covering the end portion or one zone near to said end portion.
12. Articulated arm according to claim 11, characterized in that each of the end portions
of the band (40) has at least a folded end portion (41) shaping a fold and the end
part (41a) of said fold remains backed against the band itself (40) by crushing.
13. Articulated arm, according to claim 12, characterised in that said end portion of
the band includes several cuts and the portions (43), (44) in which said cuts subdivide
the band (40), are folded and rabated on one and the other faces of the band (40)
prior to molding the end piece (45).
14. Articulated arm, according to claim 12 characterised in that the molded terminal end
(46) is positioned covering a portion close to the end of the band (40), so that the
at least one fold (47) shaping a loop protruding from the molded sector (46), which
allows workable to have a stem or shaft (48) inserted through said loop.
15. Articulated arm, according to claim 11, characterised in that each of the reinforcement
metal threads (40a) within the band (40) includes a multiplicity of filaments, a part
of them having been stripped, protruding from the end of the band (40), prior to molding
related terminal part, and in that from said filaments enlarged cores are shaped by
deforming-compacting them.
16. Articulated arm, according to claim 11, characterised in that each of the reinforcement
metal threads (40a) includes a multiplicity of filaments, a part of them stripped,
protruding from the end of the band (40), prior to molding related terminal part,
and in that the different filaments are unthreaded in the end zones of each filament
(40a).
17. Articulated arm, according to the claims 1 to 3, characterized in that said tubular
profiles (10, 11) integrating each arm adopt a shape having one of their walls (10a,
11a), oriented inwardly the awning, significantly planar, and its external wall (10b,
11b) curved-convex crowning outwardly, including inside both tubular profiles in opposite
walls, a pair of longitudinal ribs (27-28, 29-30) oppositely shifted which are embedded
in grooves (31, 32) pierced in one of the side faces of the socketing members (16,
17), and in steps defined by a protruding rib (33, 34) on the opposite face thereof,
said grooves (31, 32) offering an enlargement (31a, 32a) at their end portions, delimited
by an inclined plane.