EP3211152B1 - Extendable arm for the traction of the front bar of an awning and method for mounting said arm - Google Patents

Description

FIELD OF THE INVENTION

The present invention refers to an extendable awning pull arm, the features of which give it more mounting options over existing arms. In particular, the arm which is the subject of the present invention allows the prestressing of the internal elastic element without a tool provided for this purpose being necessary.

STATE OF THE ART

Extensible traction arms of the front traction bar of a blind are known, of the type which comprise a first arm element and a second arm element articulated between them.

On these arms the first arm element consists of a first profile, on which is located at its ends a first articulation end with the second arm element and a second connecting end to the front traction bar and the second element consists of a second profile on which is located at its ends a first end of articulation with the first arm element and a second end of connection to a fixed support of the end of the arm.

Inside the arm is a traction element provided with a first end, a second end and an elastic element disposed between the two ends. The first end of the traction element is integral with the first articulation end of the first arm member and the second end of the traction element is integral with the second end.

The elastic member is stressed so that in the equilibrium position in the absence of other forces, the arm is extended. The movable ends of the arms are connected to the front drawbar. The ends are attached to a fixed component of the blind, where the roller box is usually located.

Therefore, the arms are unfolded by pushing by their mobile end the traction bar, which unrolls the fabric of the blind. To store the awning, the roller must overcome the pulling force of the elastic elements, so that the arms can bend.

In order for the arms to move the front bar and unwind the canvas, and additionally keep the canvas taut, the elastic element, which is usually a coil spring, must be tightly stretched to ensure sufficient force to overcome the resistance of the canvas. . In order to be able to carry out the prestressing, it is necessary to have a special tool, which implies limits concerning the place in which the assembly of the arm can be carried out.

It often happens that an intermediary customer needs to give a particular look to the arm, in particular to paint it a certain color. However, the manufacturer of the arms usually has to be the one who has the spring preload tool, which implies that the latter has to paint the arms himself before sending them to the intermediary customer, who usually does not have of the tool. Therefore, this supposes that the latter must carry out the painting operation himself before sending them to the intermediate customer, which implies high costs of differentiated treatment and storage, more particularly in the case of limited series.

The document EP 1 013 846 A1 describes an extendable arm for pulling the front pull-up bar of a blind, which comprises a first arm member and a second arm member, the first arm member consisting of a first profile, a first end of 'articulation with the second arm element and a second link end to the front traction bar, the second element consisting of a second profile, a first articulation end with the first arm element and 'a second connecting end a fixed support of the end of the arm, the two arm elements being articulated by means of an articulation, the arm comprising a traction element provided with a first end, a second end and a elastic element disposed between the two ends, the first end of the traction element being integral with the first articulation end of the first arm element, the second end of the traction element being integral with the second end, in which the traction element comprises a section of adjustable length between its second end and the elastic element, the section of adjustable length being provided with a threaded rod and a threaded tube which cooperates with the rod threaded.

Nevertheless, the arm described in the document EP 1 013 846 A1 has the disadvantage of mounting the traction element, since this must be carried out in the factory.

1. a) Obtenir un premier élément de bras et un deuxième élément de bras, le premier élément de bras étant constitué d'un premier profil, d'une première extrémité d'articulation avec le deuxième élément de bras et d'une deuxième extrémité de liaison à la barre frontale de traction, le deuxième élément de bras étant constitué d'un deuxième profil, d'une première extrémité d'articulation avec le premier élément de bras et d'une deuxième extrémité de liaison un support fixe de l'extrémité du bras,
2. b) Obtenir un élément de traction pourvu d'une première extrémité, d'une deuxième extrémité et d'un élément élastique disposé entre les deux extrémités, l'élément de traction comprenant un tronçon de longueur réglable entre sa deuxième extrémité et l'élément élastique, le tronçon étant de longueur réglable pourvu d'une tige filetée et d'un tube fileté qui coopère avec la tige filetée;
3. c) Articuler les deux éléments de bras par leurs extrémités d'articulation, de sorte à configurer une articulation,
4. d) Ancrer la première extrémité de l'élément de traction sur la première extrémité d'articulation du premier élément de bras,
5. e) Ancrer la deuxième extrémité de l'élément de traction sur la deuxième extrémité,
6. f) Visser la tige filetée sur le tube fileté jusqu'à obtenir une tension voulue de l'élément élastique.

There is therefore a need for a technical solution allowing the intermediary customer to receive the dismantled arm elements so that the latter gives them a personalized finish, before mounting the spring, but without having to acquire the tool for this. voltage and the personnel required to use it. DE 78 04 978 U1 describes a method of mounting an extendable traction arm of the front traction bar of a blind, which comprises the steps of:

1. a) Obtain a first arm element and a second arm element, the first arm element consisting of a first profile, a first articulation end with the second arm element and a second link end to the front pull-up bar, the second arm element consisting of a second profile, a first articulation end with the first arm element and a second connecting end a fixed support of the end of the arms,
2. b) Obtain a traction element provided with a first end, a second end and an elastic element arranged between the two ends, the traction element comprising a section of adjustable length between its second end and the element elastic, the section being of adjustable length provided with a threaded rod and a threaded tube which cooperates with the threaded rod;
3. c) Articulate the two arm elements by their articulation ends, so as to configure an articulation,
4. d) Anchor the first end of the traction element to the first articulation end of the first arm element,
5. e) Anchor the second end of the traction element to the second end,
6. f) Screw the threaded rod onto the threaded tube until the desired tension of the elastic element is obtained.

DESCRIPTION OF THE INVENTION

• un premier élément de bras et un deuxième élément de bras,
• le premier élément de bras étant constitué d'un premier profil, d'une première extrémité d'articulation avec le deuxième élément de bras et d'une deuxième extrémité de liaison à la barre frontale de traction,
• le deuxième élément de bras étant constitué d'un deuxième profil, d'une première extrémité d'articulation avec le premier élément de bras et d'une deuxième extrémité de liaison un support fixe de l'extrémité du bras,
• les deux éléments de bras étant articulés moyennant une articulation,

le bras comprenant un élément de traction pourvu d'une première extrémité, d'une deuxième extrémité et d'un élément élastique disposé entre les deux extrémités,To circumvent the above drawback, the present invention provides an extendible arm for pulling the front pull bar of a blind, which comprises:

• a first arm element and a second arm element,
• the first arm element consisting of a first profile, a first end of articulation with the second arm element and a second end of connection to the front traction bar,
• the second arm element consisting of a second profile, a first articulation end with the first arm element and a second connecting end a fixed support for the end of the arm,
• the two arm elements being articulated by means of an articulation,

the arm comprising a traction element provided with a first end, a second end and an elastic element arranged between the two ends,

the first end of the traction element being integral with the first articulation end of the first arm element, the second end of the traction element being integral with the second end, in which the traction element comprises a section of adjustable length between its second end and the elastic element, the section of adjustable length being provided with a threaded rod and a threaded tube which cooperates with the threaded rod, and in which the first end of the traction element is a ring, and in which the end of articulation with the second arm element of the first arm element comprises an externally accessible groove provided in turn with a projection of circular contour for anchoring the first end of the traction element.

Thus, it is not necessary for the assembly step to have a special tool like the one mentioned above, the arm can then be mounted in any place where there are means for mutually thread the threaded rod and the threaded tube. Furthermore, it is a compact solution which enables the anchoring part to be obtained by molding the articulation end of the first arm element.

In some embodiments, the resilient member has a proximal end closer to the second arm end of the second arm member and a distal end closer to the joint and wherein the second end of the traction member corresponds to the The end of the threaded rod and the threaded tube is provided with means for anchoring the proximal end of the elastic element.

Thus, a configuration allowing access to the end of the rod thread is possible, which can be provided with an orifice for its rotary actuation by means of a tool, such as for example an Allen key or similar.

In some embodiments, the anchoring means are arranged at the end of the threaded tube.

In some embodiments, the anchoring means are arranged on the outer surface of the threaded tube.

In some embodiments, the traction element comprises an inextensible traction section, the end of which corresponds to the first end of the traction element and the other end of which is connected to the distal end of the elastic element.

In some embodiments, the inextensible traction section consists of a cable passed in duplicate and the ends of which are arranged as connecting rings at the distal end of the elastic element, so that the central part of the cable is arranged as an anchor, with the cable arranged inside a rectangular section sheath.

The sheath offers in the context of the present invention the advantages mentioned in the utility model U200700021 of the same holder and relating to a traction element for articulated arms, namely, it makes it possible to protect both the cable and the elements of arm, and also offers an attractive aesthetic appearance, because the cable is not visible. In particular, the present invention allows the cable to pass through the exterior of the joint without the cables being visible.

In certain embodiments, the end of articulation with the second arm element of the first arm element comprises a housing with a section complementary to the rectangular section of the sheath.

With this configuration, a perfect fit is obtained between the sheath and the housing, which also offers great aesthetic quality, since the outer surface of the joint can be perfectly cylindrical.

In some embodiments, the arm comprises a cover of the assembly consisting of the groove and the projection.

This cover makes it possible to hide, in the same way as the sheath, the parts which configure the anchoring, which guarantees an aesthetic quality of the articulation of the arm.

In some embodiments, the projection and the cover include mutual coupling means.

In some embodiments, the second end of the second arm element comprises a through orifice for the partial accommodation of the section of adjustable length, the through orifice being provided with a conical flare at its distal end, and a flare of constant section. at its proximal end which defines a bearing surface for the head of a visible end of the section of adjustable length.

In some embodiments, the arm includes means for preventing rotation of the threaded tube. Preferably, said means consist of a pin which passes through the threaded tube, the length of the pin being at least greater than the smallest of the transverse dimensions of the internal housing of the housing profile of the threaded tube.

It is thus possible to prevent the torque caused by the screwing of the threaded rod on the threaded tube from being transmitted to the elastic element, and therefore to allow the rod to be screwed more effectively.

1. a) Obtenir un premier élément de bras et un deuxième élément de bras, le premier élément de bras étant constitué d'un premier profil, d'une première extrémité d'articulation avec le deuxième élément de bras et d'une deuxième extrémité de liaison à la barre frontale de traction, le deuxième élément étant constitué d'un deuxième profil, d'une première extrémité d'articulation avec le premier élément de bras et d'une deuxième extrémité de liaison un support fixe de l'extrémité du bras,
2. b) Obtenir un élément de traction pourvu d'une première extrémité, d'une deuxième extrémité et d'un élément élastique disposé entre les deux extrémités, l'élément de traction comprenant un tronçon de longueur réglable entre sa deuxième extrémité et l'élément élastique, le tronçon de longueur réglable étant pourvu d'une tige filetée et d'un tube filetée qui coopère avec la tige filetée ;
3. c) Articuler les deux éléments de bras par leurs extrémités d'articulation, de sorte à configurer une articulation,
4. d) Ancrer la première extrémité de l'élément de traction sur la première extrémité d'articulation du premier élément de bras ;
5. e) Ancrer la deuxième extrémité de l'élément de traction sur la deuxième extrémité,
6. f) Visser la tige filetée sur le tube fileté jusqu'à obtenir une tension voulue de l'élément élastique,

bras dont la première extrémité de l'élément de traction est un anneau, et dans lequel l'extrémité d'articulation avec le deuxième élément de bras du premier élément de bras comprend une rainure pourvue à son tour d'une saillie au contour circulaire, dans lequel l'étape d) est mise en oeuvre en insérant l'anneau qui constitue l'ancrage de la première extrémité de l'élément de traction de l'élément de traction dans la saillie.The invention also refers to a method of mounting an extendable traction arm of the front traction bar of a blind, which comprises the steps of:

1. a) Obtain a first arm element and a second arm element, the first arm element consisting of a first profile, a first articulation end with the second arm element and a second link end to the front traction bar, the second element consisting of a second profile, a first end of articulation with the first arm element and a second connecting end a fixed support for the end of the arm,
2. b) Obtain a traction element provided with a first end, a second end and an elastic element arranged between the two ends, the traction element comprising a section of adjustable length between its second end and the element elastic, the adjustable length section being provided with a threaded rod and a threaded tube which cooperates with the threaded rod;
3. c) Articulate the two arm elements by their articulation ends, so as to configure an articulation,
4. d) Anchor the first end of the traction element to the first articulation end of the first arm element;
5. e) Anchor the second end of the traction element to the second end,
6. f) Screw the threaded rod onto the threaded tube until the desired tension is obtained on the elastic element,

arm of which the first end of the traction element is a ring, and in which the end of articulation with the second arm element of the first arm element comprises a groove provided in turn with a projection with a circular contour, wherein step d) is carried out by inserting the ring which constitutes the anchoring of the first end of the traction element of the traction element in the projection.

This method makes it possible to circumvent the shortcomings of the state of the art, given that the operations d), e) and f) do not need a particular tool for the operation of prestressing the elastic element. .

Therefore, once the elements of steps a) and b) have been produced in one place, the other operations can be carried out in another place. In particular, in this second place, a painting operation can be carried out, before proceeding with steps c) to f), to produce small series of arms with particular colors.

Preferably, the resilient member has a proximal end closer to the second end of the second arm member and a distal end closer to the joint and wherein the second end of the traction member matches the end of the arm member. the threaded rod and the threaded tube is provided at one of its ends with means for anchoring the proximal end of the elastic element, in which the second end of the second arm element comprises a through-hole for the partial accommodation of the section of adjustable length, the through orifice being provided with a conical flare at its distal end, and a flare of constant section at its proximal end which defines a bearing surface for the head of a visible end of the adjustable length section, so that step e) can be carried out comfortably and easily.

Finally, the method includes an additional step of coupling a cover of the assembly consisting of the groove and the projection.

BRIEF DESCRIPTION OF THE FIGURES

• La figura 1 est une vue en perspective du premier élément de bras, qui est celui qui est en contact avec la barre de traction avant.
• La figura 2 est une vue en perspective du deuxième élément de bras, qui est celui qui a l'extrémité solidaire avec une structure fixe.
• Les figures 3 et 4 sont des perspectives de l'articulation, où l'on peut observer l'emboîtement de gaine dans une rainure périphérique de l'articulation.
• La figure 5 montre en perspective les composants de base de l'invention, bien que l'élément élastique soit seulement représenté par une ligne, et dans lequel l'extrémité de fixation à la partie fixe est apparente en section pour pouvoir observer sa disposition intérieure.
• La figure 6 est analogue à la figure 5, mais sans coupe.

To complete the description and with the aim of facilitating a better understanding of the characteristics of the invention, according to an example of a practical embodiment of the latter, a set of figures is accompanied as an integral part of the description in which by way of illustration and not limiting, the following has been shown:

• Figure 1 is a perspective view of the first arm member, which is the one which is in contact with the front drawbar.
• Figure 2 is a perspective view of the second arm element, which is the one which has the end integral with a fixed structure.
• The figures 3 and 4 are perspectives of the joint, where the sleeve interlocking in a peripheral groove of the joint can be seen.
• The figure 5 shows in perspective the basic components of the invention, although the elastic element is only represented by a line, and in which the end of attachment to the fixed part is visible in section to be able to observe its internal arrangement.
• The figure 6 is analogous to figure 5 , but without cutting.

DESCRIPTION OF AN EMBODIMENT OF THE INVENTION

As can be seen in the figures, the invention refers to an extendable arm B for pulling the front pull bar of a blind.

This arm is composed of a first arm element B1, shown in isolation on the figure 1 , and a second arm element B2, shown in figure 2 .

The first arm element B1 consists of a first profile P1, a first end B11 of articulation with the second arm element B2 and a second end B12 for connection to the front traction bar.

The second arm element B2 consists of a second profile P2, a first end B21 of articulation with the first arm element B1 and a second end B22 connecting a fixed support of the end of the arm B .

As can be seen from figures 3 , 5 and 6 , the two arm elements B1, B2, are articulated by means of a joint A.

The arm B comprises inside a traction element 1 provided with a first end 11, a second end 12 and an elastic element 13, arranged between the two ends 11, 12, such as can be observe on figures 5 and 6 .

The first end 11 of the traction element 1 is integral with the first articulation end B11 of the first arm element B1, and the second end 12 of the traction element 1 is integral with the second end B22.

These characteristics being known, according to the present invention and as shown in the figure 5 , the traction element 1 comprises a section 14 of adjustable length between its second end 12 and the elastic element 13, the section 14 being of adjustable length provided with a threaded rod 141, which is preferably a screw with a head provided a socket for an Allen key, and a threaded tube 142 which cooperates with the screw 141.

According to the embodiment illustrated on figure 5 , the elastic member 13 has a proximal end closer to the second end B22 of the second arm member B2 and a distal end closer to the joint A and the second end 12 of the traction member 1 corresponds to the end of the threaded rod 141 and the threaded tube 142 is provided at one of its ends with anchoring means 143 of the proximal end of the elastic element 13.

The traction element 1 comprises an inextensible traction section whose end corresponds to the first end 11 of the traction element 1 and whose other end is connected to the distal end of the elastic element 13.

The inextensible traction section consists of a cable 15 passed in duplicate and the ends of which are arranged as connecting rings at the distal end of the elastic element 13, so that the central part of the cable 15 is arranged as an anchor, with the cable 15 being arranged inside a sheath 16 of rectangular section. By "duplicated" it should be understood that it is a single cable, with the two ends anchored on the distal end of the spring 13, the central part being curved to constitute an anchoring link on the projection. A2.

The end B11 of articulation with the second arm element B2 of the first arm element B1 comprises a housing A4 of section complementary to the rectangular section of the sheath 16.

With this configuration, a perfect fit is obtained between the sheath and the housing, which also offers great aesthetic quality, since the outer surface of the joint can be perfectly cylindrical.

Although we describe the anchoring solution in which the end of the inextensible section is fixed to the end of the first traction element, it is also conceivable that this end is fixed to a rotating core introduced on the axis of the articulation, in which the core is integral with the first arm element. This solution is that which is described for example in the documents published with the numbers ES 1 127 205 U or EP 1 650 373 B1 .

The first end 11 of the traction element is a ring, and the end B11 of articulation with the second arm member B2 of the first arm member B1 comprises a groove A1 provided in turn with a projection A2 at the contour circular for anchoring the first end 11 of the traction element. This end corresponds to the link which constitutes the 180º curve of the cable passed in duplicate.

As can be seen on the figure 5 , the arm comprises a cover A3 of the assembly consisting of the groove A1 and the projection A2.

The second end B22 of the second arm element A2 comprises a through hole B221 for the partial housing of the section 14 of adjustable length.

In addition, the through-hole B221 provided with a conical flare B222 at its distal end, and a flare B223 of constant section at its proximal end which defines a bearing surface for the head of a visible end of the section 14 adjustable length. The B222 conical flare facilitates the quick assembly of the tension element.

We therefore observe on the figure 5 that to achieve the spring tension it suffices to mount the various elements and to screw the screw by its head, which is visible at the fixed end of the arm. To carry out this operation all you need is an Allen key, so you can do without a pulling tool provided for this purpose.

The arm also comprises means 144 for preventing the rotation of the screwed tube 142 when the screw 141 is operated with a key, by a user. The figure 6 shows an embodiment of the means for avoiding rotation consisting of a pin 144. This pin 144 is inserted into an orifice of the threaded tube, for example near the end of anchoring to the traction element. The length of the pin should be greater than the smallest transverse dimension of the housing of the second arm member, which is the one that houses the spring.

• a) Obtenir un premier élément de bras B1 et un deuxième élément de bras B2, le premier élément de bras B1 étant constitué d'un premier profil P1, d'une première extrémité B11 d'articulation avec le deuxième élément de bras B2 et d'une deuxième extrémité B12 de liaison à la barre frontale de traction, le deuxième élément de bras B2 étant constitué d'un deuxième profil P2, d'une première extrémité B21 d'articulation avec le premier élément de bras B1 et d'une deuxième extrémité B22 de liaison un support fixe de l'extrémité du bras B,
• b) Obtenir un élément de traction 1 pourvu d'une première extrémité 11, d'une deuxième extrémité 12 et d'un élément élastique 13 disposé entre les deux extrémités 11, 12, l'élément de traction 1 comprenant un tronçon 14 de longueur réglable entre sa deuxième extrémité 12 et l'élément élastique 13, le tronçon 14 étant de longueur réglable pourvu d'une tige filetée 141 et d'un tube fileté 142 qui coopère avec la tige filetée 141 ;
• c) Éventuellement, réaliser la finition des éléments de bras, comme par exemple les peindre ;
• c) Articuler les deux éléments de bras B1, B2 par ses extrémités d'articulation, de sorte à configurer une articulation A,
• e) Ancrer la première extrémité 11 de l'élément de traction 1 sur la première extrémité B11 d'articulation du premier élément de bras B1
• f) Ancrer la deuxième extrémité 12 de l'élément de traction 1 sur la deuxième extrémité B22,
• g) Visser la tige filetée 141 sur le tube fileté 142 jusqu'à obtenir une tension voulue de l'élément élastique 13.

The procedure for mounting the extendable arm of the invention is very simple, and includes the steps of:

• a) Obtain a first arm element B1 and a second arm element B2, the first arm element B1 consisting of a first profile P1, a first end B11 of articulation with the second arm element B2 and d 'a second end B12 for connection to the front traction bar, the second arm element B2 consisting of a second profile P2, a first end B21 of articulation with the first arm element B1 and a second end B22 connecting a fixed support for the end of the arm B,
• b) Obtain a traction element 1 provided with a first end 11, a second end 12 and an elastic element 13 arranged between the two ends 11, 12, the traction element 1 comprising a section 14 of length adjustable between its second end 12 and the elastic element 13, the section 14 being of adjustable length provided with a threaded rod 141 and a threaded tube 142 which cooperates with the threaded rod 141;
• c) If necessary, finish the arm elements, such as painting them;
• c) Articulate the two arm elements B1, B2 by its articulation ends, so as to configure a articulation A,
• e) Anchor the first end 11 of the traction element 1 on the first articulation end B11 of the first arm element B1
• f) Anchor the second end 12 of the traction element 1 on the second end B22,
• g) Screw the threaded rod 141 on the threaded tube 142 until the desired tension is obtained on the elastic element 13.

In this text, the word "includes" and its variants such as "including", etc. should not be interpreted exclusively, that is, they do not exclude the possibility that what is described includes other elements, steps etc.

On the other hand, the invention is not limited to the particular embodiments which are described but also encompasses, for example, the variants which can be produced by the average person skilled in the art for example, as regards the choice of materials, dimensions, components, etc. configuration, etc., in what follows from the claims.

Claims (14)

1. Extensible traction arm (B) for the front traction bar of an awning, which arm comprises:
   a first arm element (B1) and a second arm element (B2), the first arm element (B1) consisting of a first profile (P1), a first end (B11) for hinging to the second arm element (B2) and a second end (B12) for connecting to the front traction bar, the second arm element (B2) consisting of a second profile (P2), a first end (B21) for hinging to the first arm element (B1) and a second end (B22) for connecting to a fixed support of the end of the arm (B), the two arm elements (B1, B2) being hinged by means of a hinge (A), the arm (B) comprising a traction element (1) provided with a first end (11), a second end (12) and an elastic element (13) arranged between the two ends (11, 12), the first end (11) of the traction element (1) being rigidly connected to the first hinge end (B11) of the first arm element (B1), the second end (12) of the traction element (1) being rigidly connected to the second end (B22), the traction element (1) comprising, between its second end (12) and the elastic element (13), a segment (14) of adjustable length, the segment (14) of adjustable length being provided with a threaded rod (141) and a threaded tube (142) which engages with the threaded rod (141), characterised in that the first end (11) of the traction element is a ring, and in that the end (B11) of the first arm element (B1) for hinging to the second arm element (B2) comprises a groove (A1) that can be accessed from the outside and is in turn provided with a projection (A2) having a circular outline for anchoring the first end (11) of the traction element.
2. Arm according to claim 1, wherein the elastic element (13) has a proximal end closer to the second end (B22) of the second arm element (B2) and a distal end closer to the hinge (A) and wherein the second end (12) of the traction element (1) corresponds to the end of the threaded rod (141) and the threaded tube (142) is provided at one of its ends with means (143) for anchoring the proximal end of the elastic element (13).
3. Arm according to claim 2, wherein the anchoring means (143) are arranged at the end of the threaded tube (142).
4. Arm according to claim 2, wherein the anchoring means (143) are arranged on the outer surface of the threaded tube (142).
5. Arm according to any of the preceding claims, wherein the traction element (1) comprises an inextensible traction segment, the end of which corresponds to the first end (11) of the traction element (1) and the other end of which is connected to the distal end of the elastic element (13).
6. Arm according to claim 5, wherein the inextensible traction segment consists of a doubled-up cable (15), the ends of which are arranged as rings for connecting to the distal end of the elastic element (13) such that the central part of the cable (15) is arranged as an anchor, with the cable (15) being arranged inside a sheath (16) having a rectangular cross section.
7. Arm according to claim 6, wherein the end (B11) of the first arm element (B1) for hinging to the second arm element (B2) comprises a housing (A4) having a cross section that is complementary to the rectangular cross section of the sheath (16).
8. Arm according to claim 1, which comprises a cover (A3) for the assembly consisting of the groove (A1) and the projection (A2).
9. Arm according to claim 8, wherein the projection (A2) and the cover (A3) comprise mutual coupling means.
10. Arm according to any of the preceding claims, wherein the second end (B22) of the second arm element (B2) comprises a through-hole (B221) for partially accommodating the segment (14) of adjustable length, the through-hole (B221) being provided, at its distal end, with a conical flare (B222) and, at its proximal end, with a flare (B223) which has a constant cross section and defines a bearing surface for the head of a visible end of the segment (14) of adjustable length.
11. Arm according to claim 2 and any claim dependent thereon, which arm comprises means for preventing the threaded tube (142) from rotating.
12. Method for mounting an extensible traction arm (B) for the front traction bar of an awning, which method comprises the steps of:

    a) producing a first arm element (B1) and a second arm element (B2), the first arm element (B1) consisting of a first profile (P1), a first end (B11) for hinging to the second arm element (B2) and a second end (B12) for connecting to the front traction bar, the second arm element (B2) consisting of a second profile (P2), a first end (B21) for hinging to the first arm element (B1) and a second end (B22) for connecting to a fixed support of the end of the arm B;

    b) producing a traction element (1) provided with a first end (11), a second end (12) and an elastic element (13) arranged between the two ends (11, 12), the traction element (1) comprising, between its second end (12) and the elastic element (13), a segment (14) of adjustable length, the segment (14) of adjustable length being provided with a threaded rod (141) and a threaded tube (142) which engages with the threaded rod (141);

    c) hinging the two arm elements (B1, B2) by their hinge ends so as to form a hinge (A);

    d) anchoring the first end (11) of the traction element (1) to the first hinge end (B11) of the first arm element (B1);

    e) anchoring the second end (12) of the traction element (1) to the second end (B22);

    f) screwing the threaded rod (141) onto the threaded tube (142) until a desired tension of the elastic element (13) is produced, wherein the first end (11) of the traction element is a ring, and wherein the end (B11) of the first arm element (B1) for hinging to the second arm element (B2) comprises a groove (A1), which is in turn provided with a projection (A2) having a circular outline, wherein step d) is implemented by inserting, in the projection (A2), the ring of the traction element, which ring forms the anchor for the first end (11) of the traction element.
13. Method according to claim 12, wherein the elastic element (13) has a proximal end closer to the second end (B22) of the second arm element (B2) and a distal end closer to the hinge (A) and wherein the second end (12) of the traction element (1) corresponds to the end of the threaded rod (141) and the threaded tube (142) is provided at one of its ends with means (143) for anchoring the proximal end of the elastic element (13), wherein the second end (B22) of the second arm element (B2) comprises a through-hole (B221) for partially accommodating the segment (14) of adjustable length, the through-hole (B221) being provided, at its distal end, with a conical flare (B222) and, at its proximal end, with a flare (B223) which has a constant cross section and defines a bearing surface for the head of a visible end of the segment (14) of adjustable length, such that step e) can be comfortably and easily carried out.
14. Method according to claim 12, which method comprises an additional step of coupling, to the projection (A2), a cover (A3) for the assembly consisting of the groove (A1) and the projection (A2).

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