Roller shutter lock and associated installation

Abstract

This roller shutter lock (200') is configured to connect a roller shutter curtain to a winding tube for that curtain (36) and includes a first link (203) with a body (208) having an external surface (206A), oriented towards the curtain when the curtain is wound around the tube. The external surface is at least partially covered with a coating layer (214) made of an abrasion-resistant material, which is made of a synthetic polymer material and which is attached to the body by two-component injection molding.

Description

[0001] The present invention relates to a roller shutter lock and a roller shutter installation comprising such a lock.

[0002] In buildings whose walls include openings to the outside, these openings are generally equipped with a protective installation such as a roller shutter installation, to conceal the interior of the building and / or prevent intrusions. A roller shutter installation generally comprises a box, fixed to the wall above the opening and in which is housed a winding tube, pivotally mounted relative to the box and around which a roller shutter curtain is wound. A user controls the rotation of the tube and, depending on the direction of rotation of the tube, an unrolled portion of the curtain rises or falls in front of the opening to partially or completely conceal it.

[0003] The connection between the roller shutter apron and the tube is made by means of a part called a lock. The apron is generally connected to the tube by two locks, or even more depending on the length of the tube. Each lock generally consists of several links hinged together, with a front link attached to the tube and a rear link attached to an upper slat of the apron. Depending on the configuration, the front link and the rear link are separated by one or more other intermediate links or directly hinged to each other.

[0004] The lock is usually made of a rigid and strong material, for example a polymer material such as polyamide filled with glass fibers, while the surface of the apron is usually made of a comparatively softer material than the lock material. For example, the apron is made of PVC, or an aluminum alloy covered with a layer of paint. During the winding and / or unwinding movements of the apron around the tube, the apron presses and rubs on the lock, which leads to surface wear of the apron and causes the appearance of unsightly marks, which is not desirable.

[0005] It is known, in particular from EP-2 728 102-A1, to manufacture a connecting lock between a roller shutter tube and an apron, this lock comprising a lower link manufactured by bi-material injection, so as to provide the link with a skin having a low coefficient of friction, in order to avoid scratches on the apron slats.

[0006] Over time, however, such skin tends to tear off, particularly at the corners of the link, which reduces the useful life of the link.

[0007] It is these problems that the invention aims to address in particular, by proposing a device which prevents wear of the apron in a lasting manner.

[0008] To this end, the invention relates to a roller shutter lock, which is configured to connect a roller shutter apron to a winding tube of this apron and which comprises a first link with a body having an external surface, oriented towards an internal face of the apron when the apron is wound around the tube. The external surface is at least partly covered with a coating layer made of an abrasion-resistant material, which is integral with the body and which is interposed between the body and the apron when the apron is wound around the winding tube, so as to reduce wear of the apron during the winding and / or unwinding movements of the apron around the winding tube. The coating layer is made of a synthetic polymer material, in particular an elastomeric thermoplastic material. The coating layer is fixed to the body by bi-material injection.

[0009] Thanks to the invention, during the winding or unwinding movements of the apron around the tube, the internal face of the apron rests on the anti-abrasion coating layer of the lock, which reduces, or even eliminates, wear of the apron and therefore the generation of dust and the appearance of unsightly marks. The coating layer is integral with the body of the lock, for example put in place during the manufacture of the lock, requiring no additional operation during the installation of the roller shutter, which is particularly practical and quick.

[0010] According to advantageous but not mandatory aspects of the invention, such a lock may incorporate one or more of the following features taken in isolation or in any technically admissible combination: The body comprises an inner face, oriented opposite the outer face, while the body comprises at least one passage, which is arranged through the body and which opens onto the outer face and onto the inner face of the body, that each passage opens onto the outer face by an external opening, which is located under the coating layer, and that the coating layer closes the passage and extends in one piece, through this passage, so as to form an anchoring point of the coating layer to the body. The coating layer comprises a central zone, which is bordered by a peripheral edge, while each passage opens under the peripheral edge, the peripheral edge having a width of between 5 mm and 30 mm.The peripheral border comprises two longitudinal edges, which extend parallel to a longitudinal axis of the lock, the longitudinal axis of the lock being parallel to a longitudinal axis of the winding tube when the lock is mounted on this tube, while the external openings are located along the longitudinal edges of the covering layer. The covering layer comprises a central zone and two longitudinal edges, which extend parallel to a longitudinal axis of the lock, the longitudinal axis of the lock being parallel to a longitudinal axis of the winding tube when the lock is mounted on this tube, the longitudinal edges extending on either side of the central zone, while the covering layer has, in the central zone, a substantially constant average thickness, and the longitudinal edges include thinned portions, which border the longitudinal edges and which have a thickness of between 20% and 70% of the thickness of the central zone, preferably less than 60%, more preferably less than 50%.The covering layer comprises a central area, which is bordered by a peripheral edge, the peripheral edge having a continuous contour and comprising two longitudinal edges, which extend parallel to a longitudinal axis of the lock, the longitudinal axis of the lock being parallel to a longitudinal axis of the winding tube when the lock is mounted on this tube, while the central area comprises at least one window, each window allowing access to the external surface of the body.The at least one window of the central zone includes several windows, preferably an even number of windows, more preferably four windows, the windows being aligned along the longitudinal axis of the lock, two neighboring windows being separated by a strip of material, which connects the longitudinal edges to each other, and that the strips of material include a central strip, which is located astride a transverse plane of the lock, the transverse plane being orthogonal to the longitudinal axis of the lock. The windows are arranged symmetrically with respect to the transverse plane of the lock. For at least one of the links of the lock, in particular for an intermediate link of the lock, the windows of this link have a cumulative width, measured parallel to the longitudinal axis of the lock, less than 60% of a total width of this link, preferably less than 50%, preferably equal, to within ±5%, to 40% of the total width of this link.

[0011] The invention also relates to a roller shutter installation, comprising a box, which is fixed to a wall above an opening made in this wall, a winding tube, which is received in the box and pivotally mounted relative to the box, a lock as defined previously and a roller shutter apron, the apron being connected to the winding tube via the lock.

[0012] The invention will be better understood, and other advantages thereof will appear more clearly in the light of the following description of two embodiments of a roller shutter lock and of a roller shutter installation comprising such a lock, in accordance with its principle, given solely by way of example and with reference to the appended drawings, in which: [ Fig 1 ] there figure 1 is a perspective view of a roller shutter installation in accordance with a first embodiment of the invention, comprising two locks and a suspension subassembly, also in accordance with the first embodiment of the invention, shown in an unrolled configuration; [ Fig 2 ] there figure 2 is a larger scale view of the suspension subassembly of the figure 1 , observed along arrow II at figure 1 ; [ Fig 3 ] there figure 3 is a sectional view of the suspension subassembly of the figure 1 , a winding tube and an upper part of a screen of the installation of the figure 1 , the suspension subassembly and the screen portion being shown partially and in a rolled-up configuration; [ Fig 4 ] there figure 4 is a sectional view of the suspension subassembly of the figure 1 , of a portion of the winding tube and of an upper blade of the screen, the suspension subassembly being shown partially and in the unrolled configuration, and [ Fig 5 ] there figure 5 represents respectively, on three inserts a), b) and c), a view from below, from the side and a section of a link belonging to a lock according to a second embodiment of the invention.

[0013] A roller shutter installation 10 in accordance with the first embodiment of the invention is shown in the figure 1 . The roller shutter installation 10 is mounted on a wall 12 comprising an opening 14. The wall 12 is here shown in transparency, while the opening 14 is represented by a portion of a parallelepiped in dotted lines. The opening 14 is for example a window, a door or a garage entrance. The wall 12 is assumed to be vertical, the description being made in relation to the orientation of the various elements shown in the figures, knowing that it may be otherwise in reality.

[0014] The roller shutter installation 10 comprises a box 20, which is therefore a roller shutter box. The box 20 has an elongated shape extending along a main axis A20. The box 20 is fixed to the wall 12 above the opening 14, the main axis A20 being horizontal here. The box 20 is formed from an assembly of boards 22, each of which extends parallel to the main axis A20 and which together delimit an internal space V20 of the box 20. On the figure 1 , the boards 22 are shown transparently in dotted lines, to reveal the interior of the trunk 20.

[0015] The roller shutter installation 10 comprises a winding tube 100, which is received in the internal space V20. The winding tube 100 has a cylindrical shape extending along a longitudinal axis A100, is made of metal, for example steel, and is manufactured here by folding a sheet metal. The winding tube 100 comprises, at each of its ends, a bearing 102, each bearing 102 being carried by a respective flange 30 of the box 20, such that the winding tube 100 is pivotally mounted relative to the box 20, around its longitudinal axis A100. In the mounted configuration of the roller shutter installation 10, the longitudinal axis A100 is aligned with the main axis A20. Each flange 30 is carried by a tab 32, which is fixed to the wall 12, on either side of the opening 14.

[0016] The winding tube 100 here comprises two grooves 104, which extend along the winding tube 100 parallel to the longitudinal axis A100 and which are configured to mechanically cooperate with locks 200, which connect the winding tube 100 to a roller shutter apron 36. Slots 106 are here provided along the winding tube 100 for fixing the locks 200 to the winding tube 100, this aspect not being detailed further. The roller shutter installation 10 here comprises two locks 200. The two locks 200 operate in the same way and are preferably identical to each other. What is valid for one of the two locks 200 is valid for the other lock 200. In a variant not shown, the apron 36 is connected to the winding tube 100 by three locks 200, or even more, depending on the length of the winding tube 100, which is its largest dimension parallel to the longitudinal axis A100.

[0017] Each lock 200 includes a front link 202, sometimes called a tube link, by which each lock 200 is attached to the winding tube 100. In the illustrated example, each lock 200 also includes a rear link 204, by which each lock 200 is attached to the apron 36, and an intermediate link 203, which is interposed between the front link 202 and the rear link 204.

[0018] Each front link 202, intermediate link 203 or rear link 204 comprises a respective body 208. The bodies 208 are made of a rigid synthetic polymer material, considered to be non-deformable. The bodies 208 are preferably made of a thermoplastic material and are generally manufactured by hot injection. The bodies 208 are here made of polyamide filled with glass fibers.

[0019] The bodies 208 of two adjacent links, for example the body 208 of the front link 202 and the body 208 of the intermediate link 203, or the body 208 of the intermediate link 203 and the body 208 of the rear link 204, are articulated together by a hinge 210, with an axis A210 parallel to the longitudinal axis A100 when the lock 200 is mounted on the winding tube 100. A longitudinal axis A200 of the lock 200 is defined as being an axis parallel to the longitudinal axis A100 when the lock 200 is mounted on the winding tube 100. The axis A210 of each hinge 210 is parallel to the longitudinal axis A200 of the lock. By extension, the longitudinal axis A200 of the lock 200 is also a longitudinal axis for each of the links 202, 203 and 204 of this lock 200.

[0020] The apron 36 is formed from an assembly of blades 38 hinged together, an upper blade 40 being attached to the rear link 204 of each lock 200. The apron 36 is partially shown in the figures 1 à 4 . 38 blades are generally manufactured by extrusion and are considered rigid and non-deformable. 38 blades are generally made of PVC or aluminum alloy. When the 38 blades are made of PVC, the 38 blades are generally mass-dyed. When the 38 blades are made of aluminum alloy, the 38 blades are generally painted.

[0021] The roller shutter installation 10 also comprises two slides 42, which are arranged opposite each other on either side of the opening 14 and in which the ends of the slats 38 and 40 are received.

[0022] On the figure 1 , the roller shutter installation 10 is shown in a configuration of use, in which each lock 200 is assembled to the winding tube 100, in particular each front link 202 is assembled to the winding tube 100. The winding tube 100 forms, with each lock 200, a sub-assembly 300 for suspending the apron 36.

[0023] Thus, when a user controls the rotation of the winding tube 100, either manually by means, for example, of a crank / pinion assembly or a strap / pulley assembly, or automatically by means of an electric motor, the apron 36 winds or unwinds around the winding tube 100 depending on the direction of rotation of the winding tube 100. An unwound portion of the apron 36, which passes through a lower slot of the box 20 formed between the boards 22 and which is guided by the slides 42, then rises or falls in front of the opening 14 to partially or completely conceal it.

[0024] On the figures 1 And 2 , the apron 36 is shown fully unrolled, also by extension the suspension subassembly 300 is said to be in unrolled configuration. On the figure 3 , the apron 36, attached to the winding tube 100 by the lock 200, is shown wound around the winding tube 100. By extension, the suspension subassembly 300 is said to be in the wound configuration.

[0025] An inner face 42A of the apron 36 is defined as being a face of the apron 36 facing the winding tube 100 when the apron 36 is wound around the winding tube 100. Similarly, an outer face 42B of the apron 36 is also defined as being a face opposite the inner face 42A, in other words a face facing away from the winding tube 100 when the apron 36 is wound around the winding tube 100. For each link 202, 203 or 204, finally, an outer surface 206A of the corresponding body 208 is defined as being a surface facing away from the winding tube 100 when the lock 200 is assembled to the winding tube 100 and wound around this winding tube 100. In other words, when the apron 36 is wound around the winding tube 100, the external surface 206A of each body 208 is oriented towards the internal face 42A of the apron 36.An inner surface 206B is also defined as being a surface opposite the outer surface 206A, in other words the inner surface 206B is oriented towards the winding tube 100 when the apron 36 is wound around the winding tube 100.

[0026] A detail of the 300 suspension subassembly is visible on a larger scale on the figure 2 , a single lock 200 being shown. The remainder of the description is made with reference to this lock 200.

[0027] In the illustrated example, the outer surface 206A of each body 208 is partially covered with a coating layer 214, which is interposed between the corresponding body 208 and the apron 36 when the apron 36 is wound around the winding tube 100, as shown in the figure 3 The coating layer 214 is thus arranged so as to prevent any direct contact between the blades 38 of the apron 36 and the body 208 of each link 202, 203 and 204 during the winding and unwinding movements of the apron 36 around the winding tube 100.

[0028] The coating layer 214 is made of an abrasion-resistant material, so as to reduce the wear of the apron 36 when, during the winding and / or unwinding movements of the apron 36 around the winding tube 100, the internal face 42A of the apron 36 rubs against the external surface 206A of the corresponding link.

[0029] The material of the coating layer 214 has a coefficient of friction less than or equal to 0.5, preferably less than 0.4, more preferably less than 0.3, so that, figuratively, the apron “slides” on the coating layer 214, which reduces the risks of wear. The coefficient of friction considered in the context of the present description is a dynamic coefficient of friction.

[0030] According to the invention, the covering layer 214 and the body 208 are assembled to each other by overmolding. The covering layer 214 is thus fixed to the body 208 continuously, that is to say that the covering layer 214 is integral with the body 208 over the entire surface of the body 208 covered by the covering layer 214. In other words, the covering layer 214 is assembled to the body 208 so as to be in one piece with the latter, so as to avoid the tearing off of all or part of the covering layer 214 during use of the roller shutter installation 10.

[0031] Of course, in reality, localized detachments may remain at the interface between the coating layer 214 and the body 208. According to a first example, when the coating layer 214 is overmolded onto the body 208, bubbles may remain between the body 208 and the coating layer 214.

[0032] The material of the coating layer 214 is a synthetic polymer material, preferably a thermoplastic material. The body 208 and the coating layer 214 are preferably assembled to each other during the manufacture of the links 202, 203 and 204 by a process under pressure and under heat, to reduce the risks of separation of the coating layer 214 from the body 208. In the example illustrated, the coating layer 214 is made of thermoplastic polyurethane, also called thermoplastic polyurethane - or TPU - in English.

[0033] The body 208 and the coating layer 214 are preferably assembled to each other, for example by bi-material injection, in other words the coating layer 214 is overmolded onto the body 208, which is economical and practical because it makes it possible to directly form the coating layer 214 on the external surface 206A of the body 208 without any other subsequent operation.

[0034] Preferably, the material of the covering layer 214 is a relatively soft elastomeric material compared to the material of the apron 36, so as to reduce the contact pressure between the apron 36 and the covering layer 214 of each body 208, which also makes it possible to reduce the wear of the apron 36. By "soft" is meant that the material of the covering layer 214 has a hardness, measured on a scale called Shore A, of less than 90, preferably less than 85, more preferably less than 80. Preferably, the material of the covering layer 214 is a thermoplastic elastomeric material.

[0035] As illustrated in the figure 2 , for each of the intermediate links 203 and rear link 204, the coating layer 214 comprises a central zone 220, which is bordered by a peripheral edge 230. The peripheral edge 230 advantageously has a continuous contour, while the central zone 220 comprises windows 222, through which the body 208 is visible. The peripheral edge 230 has a width greater than 5 mm, preferably greater than 10 mm, so as to ensure a sufficient adhesion surface of the coating layer 214, whatever the movements of the apron 36 relative to the lock 200 when the apron 36 is wound around the tube 100.

[0036] The peripheral edge 230 comprises two longitudinal edges 232, which are opposite edges of the coating layer 204 and which each extend parallel to the longitudinal axis A200 lock 200. The longitudinal edges 232 extend on either side of the central zone 220. Each peripheral edge 232 has a width of between 5 mm and 30 mm.

[0037] The central zone 220 comprises at least one window 222, preferably an even number of windows 222, more preferably four windows 222. When the central zone 220 comprises several windows 222, these windows 222 are aligned along the longitudinal axis A200 of the lock 200. Two neighboring windows 222 are separated by a strip of material 224, which connect the longitudinal edges 232 to each other.

[0038] Each strip of material 224 has a width L224 greater than 8 mm, preferably greater than 12 mm, in particular equal to 16 mm, the width of a strip of material 224 being defined as the minimum distance between the two windows 222 which are separated by this strip of material 224. In the case of the intermediate link 203 shown in figure 2 , each strip of material 224 has a constant width L224, measured parallel to the longitudinal axis A200 of the lock 200.

[0039] Each window 222 makes it possible to reduce the quantity of material of the coating layer 214, which is economical, and makes it possible to capture some of the dust generated during the use of the roller shutter installation 10. Indeed, even if the coating layer 214 makes it possible to reduce the friction between the apron 36 and the lock 200, the coating layer 214 itself wears out, and generates dust. The windows 222 contribute to capturing some of this dust, which reduces the appearance of traces on the apron 36.

[0040] The external surface 206A of the body 208 of the corresponding intermediate links 203 or before 204 is visible through the windows 222. It is thus possible to provide inscriptions on the body 208, for example relating to the identification of the parts, while the strips of material 224 prevent friction of the apron 36 on the external surface 206A, which would impair the legibility of the inscriptions and generate dust.

[0041] Advantageously, for each of the intermediate links 203 and front links 204, one of the strips of material 224 is situated astride a transverse plane P200 of the lock 200, the transverse plane 200 being orthogonal to the longitudinal axis of the lock 200. Thus, even when the lock 200 deforms under the action of the traction of the apron 36, for example when the apron is unwound and hangs from the winding tube 100, the risks of direct contact between the apron 36 and the body 208 of the links 202, 203 and 204 are reduced.

[0042] In the illustrated example, the intermediate link 203 and the front link 204 each comprise an even number of windows 222, here four windows 222, which are separated by three strips of material 224. The strips of material 224 include a central strip 224A, which is situated astride the transverse plane P200. The central strip 224A is here situated between the other two strips of material 224. Preferably, the windows 222 are arranged symmetrically with respect to the transverse plane P200, so that the forces generated by the support of the apron 36 wound around the tube 100 are symmetrical, and as a corollary the deformation of the lock 200 is also symmetrical, which contributes to the longevity of the lock 200.

[0043] Preferably, the central strip 224A has a width greater than 10 mm, more preferably greater than 15 mm, more preferably greater than 20 mm.

[0044] The four-window 222 configuration is preferred, as it provides a good compromise between dust capture and abrasion protection.

[0045] For at least one of the links 202, 203 or 204 of the lock 200, in particular for the intermediate link 203 or for the rear link 204, the windows 222 of this link have a cumulative width, measured parallel to the longitudinal axis A100, less than 60% of a total width of this link, preferably less than 50%, preferably equal to 40%, to within ±5%, of the total width of this link, so as to ensure sufficient absorption of the forces of the rolled-up apron 36 and to prevent any risk of contact between the apron and this link, in particular when the lock 200 deforms under the effect of the traction of the apron 36.

[0046] In the wound configuration of the suspension subassembly 300, as shown in the figure 3 , in the vicinity of each hinge 210, the external surfaces 206A of the two adjacent links are geometrically carried by the same envelope 212, which is substantially a portion of a cylinder of circular section centered on the longitudinal axis A100.

[0047] On the figure 4 , the lock 200 is shown in an extended configuration, which is found for example when the apron 36 is fully unrolled. Under the action of the winding tube 100, each hinge 210 is then in abutment, the coating layer 214 of each link then being closer to the adjacent link than in the wound configuration.

[0048] Each coating layer 214 is advantageously set back relative to the adjacent hinge(s) 210, so as not to hinder the rotational movement of the two adjacent links, in particular when the hinges 210 come into abutment, in the extended configuration of the lock 200. In other words, each coating layer 214 is set back relative to the hinge(s) 210, so as not to limit an angular movement between the two corresponding adjacent links.

[0049] The covering layer 214 is sufficiently thick to distance the blades 38 from the hinges 210 in the rolled-up configuration of the apron 36, so as to reduce the risks of friction between the bodies 208 and the blades 38. For example, the covering layer 214 is sized so that in the rolled-up configuration, the blades 38 do not pass through the casing 212. Conversely, a covering layer 214 that is too thick is bulky, which is also not desirable.

[0050] The covering layer 214 has, in the central zone 220, an average thickness E214 of between 0.6 and 2 mm, preferably between 0.7 and 1.5 mm, more preferably between 0.7 and 0.8 mm. Preferably, the thickness E214 of the central zone 220 is substantially constant, i.e. constant to within ±5%. In particular, the strips of material 224 have a substantially constant average thickness. Preferably, the thickness E214 is the same for each of the links 202, 203 and 204.

[0051] A lock 200', in accordance with a second embodiment of the invention, is shown in figure 5 , only the intermediate link of this lock 200' being shown. In the second embodiment, the elements similar to those of the first embodiment bear the same references and operate in the same way. In the following, the differences between the first and second embodiments are mainly described.

[0052] One of the main differences of the second embodiment with the first embodiment is that the coating layer 214 has, along the longitudinal edges 232, thinned portions 234, with a thickness E234 less than the thickness E214 of the central area 220. The thickness E234 is between 20% and 70% of the thickness E214 of the central area 220, preferably less than 60%, more preferably less than 50%, in particular equal to 40%. In the example illustrated, the thickness E234 is equal to 0.35 mm, to within ±10%.

[0053] The thinned portions 234 each have a width of between 4 and 10 mm; preferably between 5 mm and 8 mm. The thickness E234 of the thinned portions 234 is preferably constant, the thinned portions 234 being connected to the rest of the coating layer 214 by a connection zone 236, where the thickness of the coating layer 214 increases monotonically between the thickness E234 of the thinned portions 234 and the thickness E214 of the central zone 220.

[0054] The thinned portions E234 make it possible to reduce the risks of the covering layer 214 catching during the winding or unwinding movements of the apron 36 around the winding tube 100, which reduces the risks of the covering layer 214 being torn off, and thus increases its longevity.

[0055] The body 208 comprises at least one passage 240, which is arranged through the body 208 and which opens onto the external face 206A and onto the internal face 206B. Only one passage 240 is visible on the section of the figure 5c ), the following description being made in relation to this passage 240 and being transposable to the other passages.

[0056] The passage 240 opens onto the external face 206A via an external opening 242, which is located under the covering layer 214. The covering layer 214 closes the passages 240 and extends in one piece, through this passage 240, so as to form an anchoring point for the covering layer 214 in the body 208. In the example illustrated, the covering layer 214 extends by a rod 216 ending in a protrusion 218. The rod 216 is received in the passage 240, while the protrusion 218 is located on the internal side 206B of the body 208.

[0057] The rod 216 and the protrusion 218 are preferably formed during the operation of overmolding the coating layer 214 onto the body 208, and contribute to preventing the coating layer 214 from being torn off during use of the lock 200'.

[0058] The tearing of the coating layer 214 being generally initiated on the external edges of the coating layer 214, in particular along the longitudinal edges 232, the passages 240 are advantageously located at the periphery of the coating layer 214, along the longitudinal edges 232. In other words, each passage 240 advantageously opens under the peripheral edge 230, the external openings 242 being located along the longitudinal edges 232 of the coating layer 214.

[0059] The embodiments and variations mentioned above can be combined with each other to generate new embodiments of the invention.

Claims

1. A roller shutter lock (200; 200'), this lock being configured to connect a roller shutter curtain (36) to a winding tube (100) of this curtain (36) and comprising a first link (202, 203, 204) with a body (208) having an outer surface (206A), oriented towards an inner face (42A) of the curtain (36) when the curtain (36) is wound around the tube, wherein: - the outer surface (206A) is at least partly covered with a coating layer (214) made of an anti-abrasion material, which is integral with the body (208) and which is interposed between the body (208) and the curtain (36) when the curtain (36) is wound around the winding tube (100), so as to reduce wear on the curtain (36) during the movements of winding and / or unwinding the curtain (36) around the winding tube (100), - the coating layer (214) is made of a synthetic polymer material, in particular an elastomeric thermoplastic material, - the coating layer (214) is attached to the body (208) by bi-material injection moulding.

2. The lock (200') according to claim 1, wherein: - the body (208) comprises an inner face (206B) facing away from the outer face (206A), - the body comprises at least one passage (240), which is formed through the body and emerges on the outer face and on the inner face of the body, - each passage emerges on the external face via an external opening (242), which is located beneath the coating layer (214), - the coating layer closes the passage and extends in one piece, through the passage, to form point for anchoring the coating layer to the body.

3. The lock (200') according to claim 2, wherein: - the coating layer (214) comprises a central zone (220), which is bordered by a peripheral edge (230), - each passage (240) emerges under the peripheral edge, the peripheral edge having a width of between 5 mm and 30 mm.

4. The lock (200') according to claim 3, wherein: - the peripheral edge (230) comprises two longitudinal edges (232), which extend parallel to a longitudinal axis (A200) of the lock, the longitudinal axis of the lock being parallel to a longitudinal axis (A100) of the winding tube (100) when the lock is mounted on this tube, - the external openings (242) are located along the longitudinal edges of the coating layer.

5. The lock (200; 200') according to any one of claims 1 to 4, wherein: - the coating layer (214) comprises a central zone (220) and two longitudinal edges (232), which extend parallel to a longitudinal axis (A200) of the lock, the longitudinal axis of the lock being parallel to a longitudinal axis (A100) of the winding tube (100) when the lock is mounted on this tube, the longitudinal edges extending on either side of the central zone, - in the central zone, the coating layer has a substantially constant average thickness (E234), - the longitudinal edges (232) include thinned portions (234), which border the longitudinal edges and which have a thickness (E234) of between 20% and 70% of the thickness (E214) of the central zone (220), preferably less than 60%, even more preferably less than 50%.

6. The lock (200) according to any one of claims 1 to 5, wherein: - the coating layer comprises a central zone (220), which is bordered by a peripheral edge (230), the peripheral edge having a continuous contour and comprising two longitudinal edges (232), which extend parallel to a longitudinal axis (A200) of the lock, the longitudinal axis of the lock being parallel to a longitudinal axis (A100) of the winding tube (100) when the lock is mounted on this tube, - the central area (220) comprises at least one window (222), each window allowing access to the outer surface (206A) of the body (208).

7. The lock (200) according to claim 6, wherein: - the at least one window (222) of the central zone (220) includes a plurality of windows, preferably an even number of windows, and more preferably four windows, the windows being aligned along the longitudinal axis (A200) of the lock, two adjacent windows being separated by a strip of material (224), which connects the longitudinal edges (232) to one another, - the strips of material (224) include a central strip (224A), which straddles a transverse plane (P200) of the lock, the transverse plane being orthogonal to the longitudinal axis (A200) of the lock.

8. The lock (200) according to claim 7, wherein: - the windows (222) are arranged symmetrically with respect to the transverse plane (P200) of the lock.

9. The lock (200) according to any one of claims 7 or 8, wherein: - for at least one of the links (202, 203, 204) of the lock, in particular for an intermediate link (203) of the lock, the windows (222) of that link have a cumulative width, measured parallel to the longitudinal axis (A200) of the lock, of less than 60% of a total width of that link, preferably less than 50%, more preferably equal, within ±5%, to 40% of the total width of that link.

10. The roller shutter installation (10), comprising: - a box (20), which is fixed to a wall (12) above an opening (14) made in that wall, - a roll-up tube (100), which is housed in the box and mounted so as to pivot relative to the box, - a lock (200; 200') according to any one of the preceding claims; and - a roller shutter curtain (36), the curtain being connected to the winding tube (100) via the lock (200).

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