FR2888298A1 - Angle transmission device for e.g. safety cord, has piercing made in one of flanges in oblong position permitting, radial displacement of pierced flange in unlocked position of locking screw between open and closed positions - Google Patents

Abstract

The device has a circular flat hub (27) arranged between lower and upper flanges (25, 28) for making an annular groove receiving a cord (2`). The flanges and the hub are crossed by coaxial central piercings (29, 30). The flange (25) is extended by a retention tab (26) which extends parallel to an axis of the piercing (29). The piercing is made in one of the flanges in oblong position permitting, a radial displacement of the pierced flange in an unlocked position of a locking screw (33) between open and closed positions for inserting and maintaining the cord in the groove, respectively.

Description

The present invention relates to an angle device for cables

  such as the security cables used in the lifelines.

  In general, it is known that, in order to ensure the safety of people working on a roof, safety standards recommend the use of lifelines comprising a steel cable stretched between two anchoring elements. fixed on the frame. Thus, this cable is frequently permanently installed in parallel and at a predetermined distance from the ridge.

  The tension of this cable is provided by means of a conventional type of cable tensioner interposed between one of its ends and its anchoring element.

  With these provisions, each person on the cover and equipped with a harness (or harness) can hook to this cable through a link (for example a lanyard or a strap) connected on one side to harness (or shoulder harness) and, on the other side, a carabiner that can be mounted on the cable and slide along it.

  The length of this link is determined by standards according to the dimensions of the roof.

  2888298. 2 Usually, to allow the person to work unhindered, the connection between the link and the harness or harness is made in the dorsal region of the latter.

  It turns out that, during a fall, the person who falls is too brutally restrained by the link: this brutal reaction of the link when it comes into tension can cause significant trauma. This type of trauma can be particularly serious in the case of a dorsal attachment since, in this case, the reaction of the link is exerted directly on the spine of the person.

  For this reason, specially designed damping devices are frequently used to dampen the abrupt reaction of the link and to avoid the occurrence of a restoring force that can have a harmful effect.

  It turns out that the roofs to be equipped with lifelines are not all rectilinear and can present very varied forms. Thus, on a complex roof, it is frequently necessary to provide several independent lifelines equipping each section of rectilinear roof.

  It is therefore a relatively expensive solution that involves the use for each lifeline of all the usual equipment, especially anchors, tensioners, dampers etc ...

  In an attempt to overcome this drawback, it has been proposed to use angular return parts in the form of eyelets which make it possible to use the same cable for all the sections.

  The disadvantage of this solution is that, prior to mounting, the cable must be passed through the eyelets, which greatly complicates the installation operations. In addition, at the eyelet the cable is folded and subject to shear stresses. As a result, the forces exerted on the cable are not transmitted correctly from one section to another so that the use of a tensioner and / or a single shock absorber for the same cable is excluded.

  In an attempt to overcome these drawbacks, it has also been proposed to use, as a bevel gear, a grooved pulley mounted on a support and over which the cable of the lifeline passes. In this case, to prevent the cable can escape the groove, it is necessary to provide a retaining piece, for example in the form of an angle, which can take an open position allowing the introduction of the cable inside. of the groove and a closed position to maintain the cable inside the groove.

  Nevertheless, this solution poses a certain number of problems: The angular position of the retaining piece must be variable around the axis of the pulley so that the angle return device can be used whatever its position. relative to the cable; The retainer must be designed so that it can not fade and release the cable when it is subjected to an intense stress such as that exerted when an operator the life line.

  The invention therefore more particularly aims to solve these problems by means of a simple, inexpensive return device and which allows in particular the transmission of a cable section to another tensile forces exerted by the cable so to be able to use only one tensioner and / or damper by cable.

  For this purpose, the device according to the invention consists of at least two parallel flat parts between which is disposed a flat circular core of lower section than those of the two parts, so as to achieve around the core, between said parts an annular groove in which said cable can engage, said flat parts and said core being traversed by a coaxial central bore in which can be engaged a clamping screw for assembling said parts and said core.

  According to the invention, one of said parts extended by a retaining element which extends parallel to the axis of said drilling and the hole made in one of said parts has an oblong shape allowing a radial displacement of said piece loosened position of the screw and therefore a relative movement between the two parts between an open position for insertion of the cable and a closed position in which the cable is held in the groove by the retaining element.

  Advantageously, the oblong hole is made on the flat part which does not include the retaining piece.

  In this case, this flat piece may comprise at its periphery, in the axis of the oblong bore, a notch in which the retaining piece can engage in the closed position of the device.

  Embodiments of the invention will be described hereinafter, by way of non-limiting examples, with reference to the accompanying drawings, in which: FIG. 1 is a schematic perspective view of a building equipped with two lifelines; one of which is of the classic type while the other includes a bevel gear; Figure 2 is an exploded perspective view of a bevel gear according to the invention; Figures 3, 4 and 5 are perspective views illustrating the principle of use of the lifeline shown in Figure 2; Figure 6 is a perspective view of an alternative embodiment of the lifeline according to the invention.

  In the example shown in FIG. 1, the cover 1 of the building B is equipped with two lifelines L1, L2, namely a straight line L1 located at the edge A of the cover and a line of L2 life comprising two right-angle sections T1, T2 and for this purpose using an angle of return device R. In this example, the lifeline L1 consists of a steel cable 2 stretched between two anchoring elements 3, 4 by means of a conventional cable tensioner 5.

  This lifeline L1 further comprises a damper 7, as well as holding and guiding elements 9 of the cable arranged at regular intervals (for example every 5 m).

  The anchoring elements 3, 4 are fixed at the top of the cover 1, so that the cable 2 extends parallel and close to the ridge 11. Of course, the position of these anchoring elements 3, 4 relative to the shores and gables of the roof must comply with the safety regulations in force.

  The cable 2 is intended to receive carabiners connected to insurance links (lanyards, straps or ropes insurance), themselves attached to harnesses or harnesses worn by people working on the roof. These carabiners can slide along the cable 2 so as to allow these people to move parallel to the ridge 11 while remaining assured.

  The first longitudinal section T1 of the lifeline L2 extends horizontally in the median portion of the slope V1 of the cover 1. The transverse section T2 extends from one end of the section T1 to a location in the vicinity of the bank of slope V1.

  At the junction between the two sections T1, T2 is provided a reference angle R for example of the type of those illustrated in Figures 2 to 5.

  It will be noted that despite the fact that it comprises two sections T1, T2, this lifeline L2 involves only one tensioner 5 'and a single shock absorber 7'.

  In this example, all the elements of the lifeline L2, which are attached to the cover 1 (anchor piece, intermediate anchors 9 ', angle of return device R), use a support structure 12 in form S2 which comprises a rectangular central core 13, two lateral wings 14, 15 which delimit with said core 13, a trapezoidal section volume open opposite the core 13 and two fixing lugs 16, 17 which extend the two lateral wings 14, 15 at their lower edge parallel to said core 13.

  The rectangular core 13 is provided with a central bore 18 and four peripheral bores 19 respectively located in angular regions. The fastening lugs 16, 17 each have a rectangular shape which protrudes axially on either side of the wings 14, 15.

  They each comprise two large diameter holes 20, 21 respectively disposed at both ends, and two sets of three holes 22, 23 of smaller diameters aligned along two parallel transverse axes, located in the central portion.

  These two series of holes 22, 23 allow the attachment of the support structure 12 on a failure of the frame that supports the cover 1. In the case where the cover is supported by a layer of thermally insulating material, this fixation is carried out by screwing with the interposition of cylindrical spacer bushings.

  Advantageously, the support structure 12 will be made of stainless steel sheet with a thickness of about 6 mm.

  In this example, the angle of return device R consists of three parts, namely: a circular lower flange 25 radially extended by a tongue 26 folded at right angles which constitutes the aforesaid retaining element; A flat circular core 27 of smaller diameter than that of the flange 25, the distance between the radius of the core 27 and the radius of the flange 25 corresponding substantially to the diameter of the cable 2 'of the lifeline L2, this core 27 may have a concave profile; A slightly oval upper flange 28 having two semicircular ends of diameter substantially equal to that of the flange 25, these two ends being connected to one another by a narrow band.

  The lower flange 25 and the core 27 are provided with coaxial bores 29, 30.

  The flange 28 comprises an oblong central recess 31 of width substantially equal to the diameter of the bores 29, 30. It further comprises at its periphery a rectangular notch 32 located in the axis of the oblong bore 31. This notch 32 has a section substantially equal to that of the tongue 26 which constitutes the retaining element.

  The assembly of the flanges 25, 28 and the core 27 on the rectangular core 13 of the support structure 12 is provided by a screw 33 passing through the holes 18, 29, 30, 31 whose head 34 bears on the flange 28 via a washer 35 and a nut 36 which is screwed on the screw 33 until it bears on the underside of the core 13, via a washer 37.

  Thanks to these arrangements, the introduction of the cable 2 'in the angle of return device R is effected in the loosened state of the screw 33. The flange 28 is then moved radially in the opposite direction of the element of retained so as to bring the device R in the open position, position in which is obtained between the tongue 26 and the edge of the flange 28 a space of sufficient width to allow the passage of the cable 2 'and its introduction into the annular groove defined between the two flanges 25, 28 and the core 27 (Figure 3).

  Once the cable is engaged in the groove (FIG. 4), the flange 28 is moved radially until the retaining tab 26 engages in the notch 32 (FIG. 5). The device is then in the closed position.

  The screw 33 is then tightened to lock the device in this closed position.

  An important advantage of this solution is that this locking in the closed position is independent of any tensile force exerted by the cable 2 '. Indeed, such a force is exerted essentially on the core 27 and accidentally on the retaining tongue 26. In both cases, this effort will be retransmitted on the support structure 12, in particular by means of the screw 33 without this does not cause any displacement of the core 27 or the flange 25. Furthermore, the cable 2 'has no radial engagement on the flange 28. It can therefore not be driven radially by the cable 2' and pass accidentally in the open position.

  However, as a precautionary measure, it will be possible to provide at the end of the oblong bore opposite the slot a countersink in which can be engaged at least partially, at the end of screwing, the head 34 of the screw and / or the washer 33 thus ensuring a locking of the flange in the closed position.

  Of course, the invention is not limited to the embodiment described above.

  Thus, for example, as illustrated in FIG. 6, the retaining element 26 'could be integral with the flange 28' and oriented in the direction of the support structure 12, the flange 25 being removable.

  However, in this case, this retaining element 26 'may be accidentally solicited by the cable in the radial direction. This solution therefore requires locking means of the flange such as, for example, the countersink L previously mentioned.

  Furthermore, the core 27 may be either independent, as illustrated in the drawings, or integrated with the flange 25 or the puddle 28.

  Similarly, the core 13 of the support structure 12 may constitute one of the flanges 25, 28.

  In this case, the flange 28 located opposite the core 13 may carry the retaining element 26, the drilling of the flange 28 then having an oblong shape. The core 13 of the support structure 12 may carry the retaining element 26.

2888298 -11-

Claims (11)

claims   1. Angle device for cable (2 '), this device comprising at least two parallel flat parts (25,28) between which is disposed a circular flat core (27) of lower section than those of the two parts (25). , 28), so as to form between said parts an annular groove in which said cable (2 ') can engage, said flat parts (25, 28) and said core (27) being traversed by a coaxial central bore (29). 30) in which a clamping screw (33) can be engaged for assembling said parts (25, 28) and said core (27), characterized in that one of said parts (25) is extended by a retaining element (26) extending parallel to the axis of the aforesaid bore (29) and in that the bore (31) formed in one of said parts (25, 28) has an oblong shape allowing movement radial of said piece in the loosened position of the screw and therefore a relative displacement between the two parts (25.2 8) between an open position allowing insertion of the cable (2 ') and a closed position in which the cable (2') is held in the groove by the retaining element (26).   2. Device according to claim 1, characterized in that the oblong bore (31) is formed on the flat part (28) which does not include the retaining piece (26).   3. Device according to one of the preceding claims, characterized in that the flat piece (28) devoid of retaining member comprises at its periphery, in the axis of the oblong bore, a notch (32) in which the retaining piece (26) can engage in the closed position of the device.   4. Device according to one of the preceding claims, 2888298 - 12 characterized in that the aforesaid clamping screw (33) engages in a bore (18) formed on the central core (13) of a support structure (12) in the form of S2 whose lateral wings (14,15) are extended by two respective fastening tabs (16,17) which extend parallel to said core (13).   5. Device according to claim 4, characterized in that the said flat part (25) integral with the retaining element (26) consists of a circular flange provided with a coaxial bore (29), this flange being disposed on the aforesaid soul (13).   6. Device according to one of claims 1 to 4, characterized in that said core (13) constitutes one of said flat parts (25,28).   7. Device according to claim 6, characterized in that the flat piece (28) situated opposite the core (13) carries the aforesaid retaining element (26) and in that the piercing (31) of this flat piece (28) has an oblong shape.   8. Device according to claim 6, characterized in that the core (13) of the aforesaid support structure (12) carries the aforesaid retaining element (26).   9. Device according to one of the preceding claims, characterized in that the aforesaid core (27) is integral with one of the two flat parts (25,28).   10. Device according to one of claims 1 to 8, characterized in that the aforesaid core (27) is rotatably mounted on said flat parts (25,28).   2888298 - 13 - 11. Device according to one of the preceding claims, characterized in that the aforesaid core (27) has a peripheral surface concave profile.