FR2953542A1 - DEVICE FOR TEMPORARILY FASTENING A SAFETY NET ON A GUARD RAIL - Google Patents

Abstract

The invention relates to a device (1) for temporarily securing a safety net (F) to a railing post (M), comprising means for releasably fixing the device (1) to the post (M). and a hooking means (11) of the net (F) on the device (1). The present invention finds application in the field of securing roof terraces.

Description

The present invention relates to a device for fixing a safety net on a guardrail jamb In the field of securing roof terraces, it is recommended to have safety nets on guardrail posts arranged on the entire periphery of the roof; these safety nets filling the spaces between the amounts, with a mesh more or less tight, to prevent the fall of people and also objects from the roof. In the case of a building under construction where the final railings are not yet installed, it is customary, especially during a roof waterproofing project, to set up temporary amounts on the roof. which, on the one hand, are welded hooks to hook the safety net on these temporary amounts and, on the other hand, are mounted smooth or transverse bars. These temporary amounts are usually provided with a vice for tightening, the time of construction, the temporary amount on a parapet or a rim of the roof. In the case of a building where the final guardrail amounts are already installed, it is also customary to set up these temporary amounts, in parallel with the final guardrail amounts, because the guardrail amounts Definitives are not suitable for supporting a safety net. The laying of these temporary amounts, essential for setting up the safety net, is particularly expensive and time consuming because it requires the storage of these temporary amounts, the conveying of these temporary amounts which form a heavy and bulky material, the assembly and then dismantling of these temporary amounts on the acroterium or edge of the roof, without counting sometimes the difficulty of setting these temporary amounts if the roof has an atypical configuration, with for example a parapet totally or partially isolated, the difficulty of coming to bear on the facade of the building, an acroterium too wide or not too low, the presence of a roof over the acroterium, etc. The present invention aims to at least partially solve these problems, by proposing a solution allowing the establishment of a safety net on a building roof, where the amounts of permanent railings are already installed, is happening. traditional temporary amounts.

For this purpose, it proposes a device for temporarily fixing a safety net on a railing post, comprising a means for removably attaching the device to the upright and a fastening means of the net on the device.

Thus, this device according to the invention makes it possible to temporarily fix the safety net on the final railing posts already installed on the roof of the building, in other words to take advantage of the existing amounts to secure the roof with the safety net. It suffices to mount the fasteners on the existing posts, with the removable attachment means, and to hang the safety net on the hooking means. At the end of the project, all you need is to unhitch the net and then dismantle / remove the fasteners for the existing posts. In a first embodiment of the removable fastening means, the detachable fastening means comprises: a rotating plate movable in rotation between a first position in which said rotating plate is able to fit into a groove formed in the upright, and a second position in which said rotating plate is locked inside the groove of the upright; and - a clamping means cooperating with the rotating plate for clamping the rotating plate inside the groove of the post once in the second position. Such a solution allows a quick, easy and reliable mounting of the fasteners according to the invention on the corresponding amounts. In this first embodiment, the clamping means may be selected from one of the following means: a clamping screw whose first end supports the rotating plate and whose opposite second end comprises a clamping head designed to cooperate with a clamping tool; or - a quick clamp comprising a tie rod, the first end of which supports the rotating plate, and the second opposite end of which is connected to eccentric locking means provided with at least one eccentric cam connected to an operating lever and at the second end of the tie rod and resting on an abutment surface. In a second embodiment of the removable fastening means, the detachable fastening means comprises: - a clamping piece, forming a clamp or clamping vice, designed to grip the amount; and - a clamping means cooperating with the clamping piece to press and tighten the clamping piece on the upright.

Such a solution allows an easy, reliable and robust mounting of the fasteners according to the invention on the corresponding amounts. In this second embodiment, the following three variants are possible: the clamping piece comprises a "C" shaped part provided with two opposite branches, a first branch of which is to be pressed against the upright and of which a second branch is provided with a threaded through orifice, and the clamping means comprises a screw engaged in the threaded orifice in order to abut against the upright and to tighten the clamping piece between one end of the screw and the first branch; or - the clamping piece comprises a cylindrical part whose one end is provided with an external thread and in which a longitudinal groove is provided with a bottom located opposite the thread, and the clamping means comprises a nut cooperating with threading the cylindrical piece so that the amount is engaged in the groove of the cylindrical piece and that it is clamped on the amount between the nut and the bottom of the groove; or - the clamping piece comprises two clamping jaws and the clamping means comprises a quick clamping clamp designed to bring the two jaws together and tighten them on the upright, said clamp comprising eccentric locking means provided with at least one eccentric cam connected to an operating lever and articulated on the two jaws. In a third embodiment of the removable fastening means, the removable fastening means comprises a clamp provided with: two clamping jaws movable in rotation between a first position in which the jaws frame the upright, and a second position in which the jaws enclose the amount between them; and - elastic return means urging the jaws to the second position. Such a solution allows an easy, reliable and fast mounting of the fastening devices according to the invention on the corresponding amounts.

In a first embodiment of the fastening means of the net, the attachment means comprises a carabiner system comprising: a body in the general shape of "C"; a movable finger between an open and closed position of the body; and 5 - an elastic return element urging the finger towards the closed position. In a second embodiment of the hooking means of the net, the attachment means comprises a clamp provided with: two jaws movable between an open position and a closed position; And - resilient return means urging the jaws to the closed position. In a third embodiment of the hooking means of the net, the hooking means comprises at least one hook 15 Advantageously, the hooking means of the net comprises two hooks in opposition and spaced apart from each other. Other characteristics and advantages of the present invention will appear on reading the following detailed description of eleven nonlimiting exemplary embodiments, with reference to the appended figures in which: FIG. 1 is a partial view side of a building roof equipped with a fixed amount of railing on which is mounted a device according to a first embodiment of the invention and on which is hung a safety net; FIG. 2 is a detailed view of zone II of FIG. 1 illustrating the device according to the first embodiment of the invention; - Figure 3 is a front view of the roof of Figure 1 with the device according to the first embodiment of the invention; FIG. 4 is a cross-sectional view of the upright and the device of FIG. 2 along axis AA '; FIG. 5 is a perspective view of the device according to the first embodiment of the invention; FIGS. 6a to 6c illustrate the mounting steps on an amount of the device according to the first embodiment of the invention; FIG. 7 is a perspective view of an upright on which is mounted a device according to a second embodiment of the invention; - Figure 8 is a perspective view of an amount on which is mounted a device according to a third embodiment of the invention; - Figure 9 is a perspective view of an amount on which is mounted a device according to a fourth embodiment of the invention; FIG. 10a is a perspective view of an upright on which a device according to a fifth embodiment of the invention is mounted; FIG. 10b is a perspective view of the device according to the fifth embodiment of FIG. invention; - Figure 11 is a perspective view of an amount on which is mounted a device according to a sixth embodiment of the invention; - Figure 12 is a perspective view of an amount on which is mounted a device according to a seventh embodiment of the invention; FIG. 13a is a perspective view of an upright on which is mounted a device according to an eighth embodiment of the invention; FIG. 13b is a perspective view of the device according to the eighth embodiment of FIG. invention; FIG. 14a is a perspective view of an upright on which is mounted a device according to a ninth embodiment of the invention; FIG. 14b is a perspective view of the device according to the ninth embodiment of FIG. invention; FIG. 15a is a perspective view of a device according to a tenth embodiment of the invention; - Figure 15b is a perspective view of an amount on which are mounted two devices according to the tenth embodiment of the invention, respectively in a final position and an intermediate position of mounting; FIG. 16a is a perspective view of an upright on which is mounted a device according to an eleventh embodiment of the invention; FIG. 16b is a perspective view of the device according to the eleventh embodiment of FIG. invention.

FIGS. 1 to 16b illustrate several embodiments of a temporary fastening device for a safety net F on an amount M of railings, each device according to the invention comprising a means for removably fixing the device on the amount M and a fastening means of the thread F on the device. The amount M railing is arranged in height, on a roof terrace.

In a first embodiment according to the invention illustrated in Figures 1 to 6c, the temporary fixing device 1 according to the invention comprises: - a means 10 for releasably fixing the device on the upright M, such means 10 comprising: - a rotating plate 12 rotatable between a first position in which said rotating plate 12 is adapted to be inserted into a groove R formed in the amount M, and a second position in which said rotating plate 12 is blocked at inside the groove R of the amount M; and - a clamping means 13 cooperating with the rotating plate 12 to clamp the rotating plate 12 inside the groove R of the post M once in the second position, where the clamping means 13 is made in the form of a clamping screw 13, the first end 14 of which supports the rotating plate 12, and the second opposite end of which comprises a clamping head designed to cooperate with a clamping tool (not shown); and - a fastening means 11 of the net F made in the form of a carabiner system comprising: a body 16 in the general shape of "C"; a finger 17 movable towards the inside of the body 16 between an open and closed position of the body 16; and an elastic return element (not shown) urging the finger 17 towards the closed position. Figures 1 to 3 illustrate such a device 1 mounted on the upright M, and Figures 1 and 2 more particularly illustrate two devices 1 respectively mounted in the upper and lower part of the amount M; the device 1 in the upper part being located just below a stirrup E support a high smooth L, and the device 1 in the lower part being located just above a shoe S rail designed for fixing the amount M on the roof T of the building, and in particular on a parapet A of the roof T.

More specifically, the screw 13 passes through the body 16 of the attachment means 11, opposite the finger 17, so as to press the body 16 against the post M after tightening the screw 13. FIGS. 6a to 6c illustrate the steps of mounting the device 1 5 on the upright M: - in a first step illustrated in Figure 6a, the rotating plate 12 is placed in the first position and the device 1 is inclined relative to the groove R amount M at an angle e, in order to align the rotating plate 12 with this groove R; In a second step illustrated in FIG. 6b, the device 1 is moved towards the groove R, as shown schematically by the arrow D, so as to insert the rotating plate in the groove R; in a third step illustrated in FIG. 6c, the device 1 is rotated, as shown schematically by the arrow R, and then the rotating plate is rotated by acting on the head 16 of the screw 13, as shown schematically by the arrow V illustrating the screwing of the screw 13, so that the rotating plate occupies the second position to be locked and clamped inside the groove R. Then the net F is engaged in the attachment means 11 by pushing the finger 17 to engage a cable of the net F inside the body 16. In a second embodiment according to the invention illustrated in Figure 7, the temporary fixing device 2 according to the invention comprises: a means 20 for releasably securing the device 2 to the post M, such means 20 comprising, as in the case of the first embodiment, a rotary plate (not visible) movable in rotation and a clamping screw 23 of the rotating plate inside the groove R of the amount M; and - a hooking means 21 of the net made in the form of a clamp provided with: - two jaws 25, 26 generally in the form of hooks in opposition, movable in rotation between an open position and a closed position; and - elastic return means (not shown) urging the jaws 25, 26 to the closed position. This device 2 comprises a main body 24 traversed by the screw 23, so as to clamp the main body 24 in the mounting position. The two jaws 22 are articulated in rotation on this main body 24 about an axis substantially parallel to the amount M, as shown schematically by the arrows P, on either side of the screw 23. In a third embodiment according to With the invention illustrated in FIG. 8, the temporary fixing device 3 according to the invention comprises: a means for removably attaching the device 3 to the post M, such means including, as in the case of the first mode embodiment, a rotary dish (not visible) movable in rotation and a clamping screw (not visible) of the rotating plate inside the groove R of the amount M; and 10 - a hooking means 31 of the net F made in the form of a clamp provided with: - two jaws 35, 36 movable in rotation between an open position and a closed position; and elastic return means 34 urging the jaws 35, 36 towards the closed position. The clamping screw passes through a first jaw 35, so as to clamp this first jaw 35 in the mounting position. Thus, once the device 3 is mounted on the upright M, this first jaw 35 remains fixed, and the second jaw 36 is movable between the closed and open position, as shown schematically by the arrow P. In the closed position of the jaws 35, 36, a cable of the thread F is disposed between the jaws 35, 36. The second jaw 36 is provided with a ring 37 to catch it and move it to the open position. In a fourth embodiment according to the invention 25 illustrated in FIG. 9, the temporary fixing device 4 according to the invention comprises: a means for detachably fixing the device 4 on the post M, such means including, as in the case of the first embodiment, a rotating dish (not visible) movable in rotation and a clamping screw (not visible) of the plate rotating inside the groove R of the upright M; and - a fastening means 41 of the net F made in the form of a clamp provided with: two jaws 45, 46 movable in rotation between an open position and a closed position; and resilient return means 44 biasing the jaws 45, 46 towards the closed position.

As in the third embodiment, the clamping screw passes through a first jaw 45, so as to clamp this first jaw 45 in the mounting position. Thus, once the device 4 mounted on the upright M, this first jaw 45 remains fixed, and the second jaw 46 is movable between the closed and open position, as shown schematically by the arrow P. In the closed position of the jaws 45, 46 , a cable of the net F is disposed between the jaws 45, 46. The two jaws 45, 46 have bevelled ends 47, 48 for engaging a cable of the net F between these bevelled ends 47, 48 and then to print a force on this cable of the thread F which leads to the opening of the jaws 45, 46, without having to catch the second jaw 46 to move it to the open position. In a fifth embodiment according to the invention illustrated in FIGS. 10a and 10b, the temporary fixing device 5 according to the invention comprises: - a means 50 for detachably fixing the device on the upright M, such means 50 comprising: - a rotating plate 52 rotatable between a first position in which said rotating plate 52 is adapted to be inserted in a groove R 20 formed in the amount M, and a second position in which said rotating plate 52 is blocked inside the groove R of the amount M; and a clamping means 53 cooperating with the rotating plate 12 to clamp the rotating plate 52 inside the groove R of the post M once in the second position, where the clamping means 53 is made in the form of a quick-release fastener comprising a tie rod 54 whose first end supports the rotating plate 52, and whose second opposite end is connected to eccentric locking means provided with at least one eccentric cam 55 connected to an operating lever 56 and at the second end of the tie rod 54 and resting on an abutment surface; and - a hooking means 51 of the net F made in the form of a hook. The device 5 comprises a body 57 traversed by the tie rod 54 of the clamping means 53, so that the eccentric cam 55 bears against an abutment surface provided on the body 57, opposite the rotating plate 52.

The hook 51 protrudes from the body 57 and has a width LA substantially identical to that of the body 57, so that the hook 51 abuts against the upright M once the rotating plate 52 is locked and clamped in the groove R of the amount M .

The hook 51 has at its free end a locking piece 58 in rotation of the hook 51, and therefore the device 5, in the groove R; this locking piece 58 engaging in the groove R and thus preventing the device 5 from rotating. The fixing steps of this device 5 on the upright are the following: - turn the operating lever 56, as shown schematically by the arrow T in FIG. 10b, to turn the tie rod 54 and thus the rotating plate 52 so as to be able to insert this rotating plate 52 in the groove R; then - turn the operating lever 56 to bring the rotating plate 52 into a locking position inside the groove R; and finally - lowering the operating lever 56, as shown schematically by the arrow AB in FIG. 10b, so that the eccentric cam 55 bears against the body 57 and causes the pulling rod 54 and the rotary plate 52 to move in an opposite direction to the amount M, and causes the tightening of the rotating plate 52 inside the groove R. In a sixth embodiment according to the invention illustrated in Figure 11, the temporary fixing device 6 according to the invention comprises: - a means 60 for releasably fixing the device on the upright M, such means 60 comprising: - a clamping piece 62, forming a clamping flange or vice, designed to grip the upright M, where the clamping piece 62 has a shape of "C" and is provided with two opposite branches, including a first leg 63 intended to be pressed against the amount M and 30 a second leg 64 is provided with a threaded through hole; and a clamping means 65 cooperating with the clamping piece 62 to press and tighten the clamping piece 62 on the post M, where the clamping means is in the form of a screw 65 engaged in the threaded hole in order to abut against the upright M and to tighten the clamping piece 62 between one end of the screw 65 and the first leg 63; and - hooking means 61 of the net made in the form of a hook projecting from the second branch 64 of the clamping piece 62. In a seventh embodiment according to the invention 5 illustrated in FIG. the temporary fixing device 7 according to the invention comprises: - a means 70 for attaching the device to the post M, such means 70 comprising: - a clamping piece 72, forming a clamping flange or clamp, designed for to clamp the amount M, where the clamping piece 72 has a shape of "C" and is provided with two opposite branches, including a first leg 73 intended to be pressed against the upright M and a second leg 74 is provided with a threaded through hole; and a clamping means cooperating with the clamping piece 72 to press and clamp the clamping piece 72 on the post M, where the clamping means is in the form of a screw (not visible) engaged in the threaded orifice to abut against the post M and to tighten the clamping piece 72 between one end of the screw and the first branch 73; and - a hooking means 71 of the net made in the form of two hooks 75, 76 in opposition. This device 7 comprises a body 77 secured to the screw so that the screwing of the screw, and thus the clamping of the clamping piece 72 on the upright M, is effected by turning the body 77, as shown schematically by the arrow P. Thus, the body 77 forms a tightening head of the screw. The two hooks 75, 76 are mounted on the body 77, for example in a fixed manner to allow rotation of the body 77 by catching the hooks 75, 76 and rotating them. In an eighth embodiment according to the invention illustrated in FIGS. 13a and 13b, the temporary fixing device 8 according to the invention comprises: a device 80 for releasably fixing the device to the post M, such means 80 comprising: - a clamping piece 82, forming a clamping flange or vice, designed to grip the M upright, where the clamping piece 82 comprises two clamping jaws 83, 84 movable relative to each other; and a clamping means 85 cooperating with the clamping piece 82 to press and clamp the clamping piece 82 on the post M, where the clamping means is in the form of a quick-action clamp 85 designed to bring the clamps closer together. two jaws 83, 84 from each other (as shown schematically by arrows RA in Figure 13b) and tighten on the upright M, said clip 85 having eccentric locking means provided with at least one eccentric cam 86 connected to an operating lever 87 and articulated on the two jaws 83, 84; and - a fastening means 81 of the net made in the form of a hook 81 projecting from one of the two clamping jaws.

To bring the two jaws 83, 84 closer to each other (as shown by the arrow RA in FIG. 13b) and to tighten them on the upright M, it suffices to lower the operating lever 87, as shown schematically by the arrow AB. In a ninth embodiment according to the invention 20 illustrated in FIGS. 14a and 14b, the temporary fixing device 9 according to the invention comprises: a detachable fastening means 90 of the device 9 on the post M, such securing means 90 being in the form of a clamp provided with: - two clamping jaws 92 movable in rotation between an open position in which the jaws frame the upright M, and a closed position in which the jaws enclose the upright M between them, the opening of the clamp 90 being illustrated by the arrows P in Figure 14b; and elastic return means 93, made in the form of a helical spring 30, biasing the jaws 92 towards the closed position in order to hold the clamp 90 in place on the upright M; and - a hooking means 91 of the thread F made in the form of two hooks 94, in opposition, projecting from the respective jaws 92 of the clamp 90.

These hooks 94 also allow gripping of the clamp 90 to open it. When the device 9 is placed on the upright M, the jaws 92 pivot about an axis parallel to the upright M. In a tenth embodiment according to the invention illustrated in FIGS. 15a and 15b, the device 100 temporary fastening device according to the invention comprises: - a fixing means 110 removable device 100 on the upright M, such fastening means 110 being in the form of a clamp provided with: - two clamping jaws 112 provided respectively at their free ends abutments 113 perpendicular to the jaws 112, said jaws 112 being rotatable between a closed position (bottom in Figure 15b) in which the jaws 112 are sufficiently spaced apart from each other to frame the amount M and that the stops 112 can pass on either side of the amount M, and an open position (at the top in Figure 15b) in which the jaws 112 enclose the amount M between they with the stops 113 bearing against the amount M, the opening of the clamp 110 being illustrated by the arrows P1 and P2 in Figure 15b; and - elastic return means 114, made in the form of a helical spring, urging the jaws 112 to the open position in order to hold the clamp 110 in place on the upright M; and a hooking means 111 of the net made in the form of two hooks 115 projecting from the respective jaws 112 of the clamp 110, opposite the abutments 113, where the hooks 115 are in opposition when the clamp 110 is in the open position, as illustrated at the top in Figure 15b. These hooks 115 also allow gripping of the clamp 110 to open it. During the installation of the device 9 on the upright M, the jaws 92 pivot about an axis parallel to the upright M. The steps for fixing this device 100 on the upright M are the following: - position the clamp 110 closed so that the axis of rotation is parallel to the amount M, as illustrated below in Figure 15b; - Move the clamp 110 in translation, as shown schematically by the arrow DT in Figure 15b, until the jaws 112 frame the amount M and the stops 113 exceed the amount M; - Rotate the device 100, and therefore the clamp 110 always closed, at an angle of 90 °, as shown schematically by the arrow PQ in Figure 15b, the jaws 112 being sufficiently spaced from each other not to interfere with this pivoting; open the clamp 110, as shown diagrammatically by the arrows P1 and P2 in FIG. 15b, until the stops 113 bear against the post M and block the clamp 110 and the device 100 on the post M. an eleventh embodiment according to the invention illustrated in Figures 16a and 16b, the temporary fixing device 200 according to the invention comprises: - a fixing means 210 removable device on the amount M, such means 210 comprising: - a tightening piece 212 forming a clamping or clamping vice, designed to grip the M-upright, where the clamping piece 212 is in the form of a cylindrical piece whose first end is provided with an external thread 213 and wherein a longitudinal groove 214 is formed with a bottom 215 located opposite the thread 213; and a clamping means 216 cooperating with the clamping piece 212 to press and tighten the cylindrical clamping piece 212 on the post M, where the clamping means is in the form of a nut 216 cooperating with the thread 213 the cylindrical clamping piece 212 so that the upright M is engaged in the groove 214 of the cylindrical clamping piece 212 and that it is clamped on the upright M between the nut 216 and the bottom 215 of the groove 214; and a fastening means 211 of the net made in the form of two hooks 217 in opposition, where the hooks 217 protrude longitudinally from the cylindrical clamping piece 212 on either side of the groove 214. The steps of FIG. fixing of this device 200 on the upright M are the following: - engage the cylindrical clamping piece 212 on the upright M so that the upright M is disposed in the groove 214; - Engage the nut 216 on the thread 213 of the cylindrical clamping piece 212, as shown schematically by the arrow PE in Figure 16b, the hooks 217 being dimensioned so as not to hinder the passage of the nut 216; - Tighten the nut 216 on the thread 213, as shown schematically by the arrow PS in Figure 16b, until the nut 216 bears against the amount M and the bottom 215 of the groove 214 also comes into support against the amount M, thereby blocking the device 200 on the amount M. Of course the implementation example mentioned above is not limiting and other improvements and details can be made to the device according to the invention without departing from the scope of the invention where other forms of the removable attachment means and / or the fastening means of the net can be realized.

Claims (10)

REVENDICATIONS1. Device (1; 2; 3; 4; 5; 6; 7; 8; 9; 100; 200) for temporarily securing a safety net (F) to a railing post (M) having a means detachably securing the device (10; 20; 50; 60; 70; 80; 90; 110; 210) to the upright and a hooking means (11; 21; 31; 41; 51; 61; 71; 81; 91; 111; 211) of the net on the device. 2. Device (1; 2; 3; 4; 5) according to claim 1, wherein the removable fixing means (10; 20; 50) comprises: - a rotating plate (12; 52) rotatable between a first position in which said rotating plate is adapted to fit into a groove (R) formed in the upright (M), and a second position in which said rotating plate is locked inside the groove of the upright; and - a clamping means (13; 23; 53) cooperating with the rotating plate for clamping the rotating plate inside the groove of the post once in the second position. 3. Device (1; 2; 3; 4; 5) according to claim 2, wherein the clamping means (13; 23; 53) is selected from one of the following means: - a clamping screw (13; 23) whose first end (14) supports the rotating plate (12), and the second end (15) opposite has a clamping head adapted to cooperate with a clamping tool; or - a quick clamp (53) having a tie rod (54), the first end of which supports the turntable (52), and the second end of which is connected to eccentric locking means provided with at least one cam eccentric (55) connected to an operating lever (56) and the second end of the tie rod (54) and resting on an abutment surface (57). 4. Device (6; 7; 8; 200) according to claim 1, wherein the removable fixing means (60; 70; 80; 210) comprises: - a clamping piece (62; 72; 82; 212); forming a clamp or clamping vice designed to grip the post (M); and a clamping means (65; 85; 216) cooperating with the clamping piece for pressing and clamping the clamp on the post. 5. Device (6; 7; 8; 200) according to claim 4, wherein: - the clamping piece (62; 72) comprises a piece form of "C" provided with two opposite branches, a first branch (63 73) intended to be pressed against the upright (M) and of which a second limb (64; 74) is provided with a through-threaded orifice, and the clamping means comprises a screw (65) engaged in the threaded orifice so as to abut against the post and tighten the clamping piece between one end of the screw and the first branch; or - the clamping piece (212) comprises a cylindrical piece whose first end is provided with an external thread (213) and in which a longitudinal groove (214) is formed with a bottom (215) situated opposite the thread, and the clamping means comprises a nut (216) cooperating with the thread of the cylindrical piece so that the upright (M) is engaged in the groove of the cylindrical piece and that it is clamped on the amount between the nut and the bottom of the groove; or - the clamping piece (82) comprises two clamping jaws (83, 84) and the clamping means comprises a quick clamping clamp (85) designed to bring the two jaws together and tighten them on the upright (M), said fastener comprising eccentric locking means provided with at least one eccentric cam (86) connected to an operating lever (87) and articulated on the two jaws. 6. Device (9; 100) according to claim 1, wherein the removable fastening means (90; 110) comprises a clamp provided with: - two clamping jaws (92; 112) rotatable between a first position in which the jaws frame the upright (M), and a second position in which the jaws enclose the upright between them; and - elastic return means (93; 114) urging the jaws towards the second position. 7. Device (1) according to any one of claims 1 to 6, wherein the fastening means of the net comprises a carabiner system (11) comprising: - a body (16) in the general shape of "C"; - A finger (17) movable between an open position and closure of the body; and an elastic return element urging the finger towards the closed position. 8. Device (2; 3; 4) according to any one of claims 1 to 6, wherein the fastening means of the net comprises a clamp (21; 31; 41) provided with: - two jaws (25, 26). 35, 36, 45, 46) movable between an open position and a closed position; and - elastic return means (34; 44) urging the jaws towards the closed position. 9. Device (2; 5; 6; 7; 8; 9; 100; 200) according to any one of claims 1 to 6, wherein the fastening means of the net comprises at least one hook (25,26). 51; 61; 75; 76; 81; 94; 115; 217). 10. Device (2; 7; 9; 100; 200) according to claim 9, wherein the hooking means of the net comprises two hooks (25,26; 75,76; 94; 115; 217) in opposition and spaced apart from each other.