Classifications

• • A—HUMAN NECESSITIES
  • A62—LIFE-SAVING; FIRE-FIGHTING
  • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
  • A62B35/00—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
  • A62B35/04—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion incorporating energy absorbing means

Definitions

• the invention relates to the field of lifelines, implemented in particular for work to be performed at altitude. More particularly, it relates to a fastening system for a lifeline, which may or may not include a cable tensioner.
• a lifeline is a cable or rope installed between two fixed high points of a structure by means of a fastening system generally comprising a load absorber and a tensioner. People working on this structure, such as a roof, wear a harness to which a lanyard is connected, and cling to the lifeline by means of a carabiner or a carriage; they remain relatively free from their movements and retain the use of both their hands.
• the pre-tensioning printed on the cable causes the person to fall from a low height and the absorber absorbs the kinetic energy due to the fall so as to prevent it from being too abruptly shocked. on the other hand to avoid a voltage peak at the anchor points of the lifeline to the structure.
• a first operator connects a load absorber to a fixed point of the structure and connects one end of the cable to the absorber via, for example, a shackle,
• a second operator fixed a tensioner to another fixed point of the structure, connects the tensioner to the other end of the cable and ensures its tensioning.
• the system also has a charge indicator at one end or the other of the lifeline to warn the operator that he has reached sufficient voltage on the cable.
• the present invention aims to facilitate the establishment of a lifeline and in particular its setting tension.
• the invention proposes a system for fixing a lifeline to a structure, the system comprising a load control device, this device comprising a first element integral with an impulse load absorber and a second element, movable relative to each other and arranged to move relative to each other according to the voltage applied to the lifeline.
• the fastening system therefore comprises an impulse charge absorber - load control assembly, the charge indicator comprising a first and a second element, and being arranged so that these two elements move relative to each other.
• the other for example deviate from one another, linearly or rotatively, depending on the voltage that is applied to the cable during the establishment of the lifeline.
• This spacing may be proportional or non-proportional to the voltage applied to the cable.
• the first element and the second element of the charge indicator are connected to each other by at least one connecting means comprising at least one resilient means designed to deform under the effect of the voltage applied to the line. of life.
• the fastening system is arranged in a lifeline between the structure and the cable, or between two portions of cable, so that the voltage applied to the cable results in a deformation of an elastic means, for example at least one spring being able to work in compression or extension, provided in the connection means between the two elements of the charge indicator.
• the load-indicating device may further comprise a graduation integral with said first element and an index integral with said second element, arranged so that the index can move with respect to the graduation.
• the load indicating device may further comprise a scale integral with said second element and an index integral with said first element, arranged so that the index can move opposite the graduation.
• the graduation may extend to the edge of an elongated opening, and the index finger can move in the opening when the at least one elastic means is deformed.
• the graduation support is for example a rectilinear strip or a curved dial having an opening.
• said first and second elements of the charge indicator may each comprise an opening, said openings being traversed by a rod comprising a support piece at each end, a helical spring being mounted around the rod between a support piece and the second element, so that the spring tends to bring the two elements.
• the spring is supported on the one hand on a first support piece at the end of the rod, and secondly on the second element, so that it tends to bring the two elements of the charge indicator together and to press them against a second support piece mounted at the other end of the rod.
• the fixing means is in two variants, a first variant in which it further comprises a tensioner, and a second variant in which it has no tensioner.
• the charge control unit - impulse load absorber is secured to a tensioner, for example a cable tensioner and in a second variant this assembly is not integral with a tensioner.
• FIGS. 1A and 1B represent a first variant of the system for fixing a lifeline, respectively in perspective and seen from above,
• FIGS. 2A and 2B show a non-return device for cables respectively in perspective and in vertical section along A-A ',
• FIGS. 3A, 3B and 3C show a device for shaping a loop on a cable respectively in elevation (3A and 3B) and in perspective (3C),
• FIG. 3D represents in perspective a clamping plate of the device for shaping a loop on a cable
• FIG. 4 represents an elevated carriage cable tensioning device
• FIGS. 5A and 5B show a load control device respectively in perspective and seen from above
• FIG. 6 represents an elevated pulse load absorber device
• Figures 7A and 7B show a second variant of the system for fixing a lifeline, respectively in perspective and seen from below.
• the fastening system comprises an absorber-tensioner device 80, which is in the form of an elongate body comprising from front to back, ie from right to left in Figure 1 A:
• a trolley cable tensioning device 3 comprising a threaded tube 4,
• the absorber-tensioner device 80 comprises a part 66 forming a shackle or jumper comprising an axis 9 for fixing the device 80 to a fixed point of a high structure.
• the cable 10 for forming the lifeline enters the absorber-tensioner device 80 through the non-return device 2, passes through the tube 4, winds through 180 ° on a roller 62, and enters the forming device. a loop 5 on which it is fixed.
• the cable is energized by rotating the tube 4 by means of the nut 12, which causes the displacement of the shaping device of a loop 5 which acts as a carriage.
• the charge indicator device 70 allows an operator to monitor the cable voltage and to stop the power-up when the prescribed voltage is reached. In the event of a fall of a user connected to the lifeline, the impulse load absorber 6 absorbs the kinetic energy.
• the absorber-tensioner device 80 thus fulfills several functions:
• the device for shaping a loop on a cable 5 illustrated in FIGS. 3A to 3C comprises a channel 40 which extends along an axis X-X 1 and has a front portion 40a and a rear portion 40b. In its front portion 40a, the flanks of the channel 40 are extended by protuberances 40c and 40d each having an opening facing one another.
• a winding cam 41 is disposed between these growths 40c and 40d and in these openings along an axis Y-Y 'orthogonal to the axis X-X' of the channel 40 and above this axis; it is held at this location by a coaxial fixing means, for example a screw-nut 42.
• the cam 41 is preferably free to rotate about the Y-axis Y ', but it could be fixed.
• the forming device 5 further comprises two rods 43a and 43b parallel mounted freely rotatable about the axis YY '. These rods 43a and 43b are further fixed relative to the screw-nut assembly 42, so that they can be actuated in rotation for example by means of the head 42a of the screw.
• the rods 43a and 43b are joined by a spacer 44.
• the cam assembly 41, links 43a and 43b and spacer 44 form a cable passage 53 of substantially rectangular shape in which a cable can flow.
• the rods 43a and 43b are each extended at their end distant from the axis Y-Y 'by two hooks 45a and 45b (not visible), fixed by relative to the links and which extend in a direction substantially orthogonal to that of the rods.
• the channel 40 is fixed at the top of a support 46 which comprises two plates, a front plate 46a and a rear plate 46b, parallel and substantially orthogonal to the axis XX 'of the channel 40.
• the plates 46a and 46b each comprise in the lower part an opening 47a, 47b (not visible) of axis ZZ 'parallel to the axis XX' of the gutter 40.
• the front plate 46a has on its front face a leaf spring 48 having two openings in which can take place the ends of the hooks 45a and 45b. With this spring 48, the rods 45a and 45b and thus the cable passage 53 can be kept folded towards the rear of the channel 40.
• the forming device 5 further comprises cable clamping means comprising two screws 49a and 49b, mounted between the plates 46a and 46b and on either side of the channel 40, the heads of these screws being articulated around respective axes parallel to the axis XX 'of the gutter. These screws 49a and 49b are therefore captive.
• the clamping means further comprise a substantially rectangular plate 51 and two nuts 50a and 50b each mounted on a respective screw.
• the screws 49a and 49b pass through the plate 51 through two openings, a slot-shaped opening 51a and an orifice-shaped opening 51b.
• the plate 51 is captive.
• the plate 51 further includes on its underside a protruding part or clip 51c which can penetrate between the flanks of the channel 40.
• This clip 51c is not smooth but has a wave-shaped profile. having three vertices 51 d, 51e and 5 lf in order to distribute the clamping force on the cable on these three vertices.
• the device is used as follows, after mounting the plate 51 on the screw 49b:
• the cable 10 is slid into the channel 40 by its rear part 40b, the links 43a and 43b being oriented downwards, so that the cable crossing the cable passage 53 which constitutes the links 43a and 43b, P spacer 44 and the winding cam 41, as illustrated in FIG. 3B,
• the cable tensioning device 3 illustrated in FIG. 4 comprises a tube 4 and a support means 60 comprising two opposite planar parallel faces, a front face on which the tube 4 is rotatably mounted and a rear face on which a winding means is arranged. 62.
• the tube 4 is threaded and rotatably mounted by its rear end on the front face of the support 60, in a non-threaded opening formed in this support 60.
• the support 60 On its rear face, the support 60 has two flanges 61a and 61b (not visible) between wherein a roller 62 is rotatably mounted about an axis substantially orthogonal to the axis ZZ 'of the tube 4.
• the axis of the roller 62 is located above the axis ZZ' of the tube so that the cable 10 can to roll on this roll when it leaves the tube.
• the cable tensioning device 3 further comprises a carriage 5 'to which one end of the cable is secured, able to move along the tube 4, between its inlet 4a and the support 60.
• this carriage 5 is constituted mainly by the device for shaping a loop 5 previously described, the two devices cooperating in the following way: the tube 4 passes through the openings 47a and 47b (not visible) formed in the plates 46a and 46b of the shaping device of a loop 5; between the openings 47a and 47b, a nut 63 is attached to the plates 46a and 46b, on which the threaded tube 4 is engaged.
• the tube 4 may comprise a gripping means for its rotation, for example a nut 12 fixed to the tube 4 at its front end.
• the invention proposes an alternative for the return path of the cable between the winding means 62 and the trolley:
• the support 60 can extend above the tube 4 in front view over a length less than or equal to the diameter of the winding means 62, so that the return passage of the cable takes place above the means of 60, the support 60 may extend above the tube 4 in front view over a length greater than the diameter of the winding means 62 and have a second through opening disposed above the winding means 62 front view, so that the return passage of the cable is through this second opening (not shown).
• the device is used as follows:
• the non-return device 2 for cable tensioner 3 illustrated by FIGS. 2A and 2B, comprises a gutter-shaped part 20 whose sides 20a and 20b are elongated and parallel, closed by a "roof" 21, at the inside which the cable can take place.
• the device 2 has a front face 22 and a rear face 23, the cable penetrating the device 2 through the front face 22.
• the rear portion 23 of the device 2 comprises a fixing plate 24 attached to the rear end of the channel 20 This plate 24 has a first through opening 25a collinear with the channel 20, for mounting the non-return device 2 on a tube 4 and the cable outlet.
• the flanks 20a and 20b of the part 20 each comprise an opening
• the locking core 28 comprises:
• a shoe made of material with a high coefficient of friction for example rubber 30, notched, fixed dovetail on the lower face of the locking core, facing the bottom of the channel 20.
• the shoe in rubber 30 serves to ensure effective blocking of the cable without hurting the latter.
• Each lug 29a, 29b slides inside a respective opening 26a, 26b. They hold the locking core 28 inside the gutter-shaped part 20.
• the non-return device 2 further comprises a return means located between the flanks of the gutter, which pushes the locking core into the locking position.
• the locking core 28 comprises a rod 31 which extends substantially perpendicularly from its rear face. This rod 31 passes through a second opening 25b formed in the plate 24, above the first opening 25a, and a washer 33 coaxial.
• a spring 32 working in compression Around the rod 31 is wound a spring 32 working in compression, which is supported on the one hand on the rear face of the locking core 28 and on the other hand on the fixing plate 24 via the washer 33 Thanks to these arrangements, the locking core 28 is held pushed back towards the front of the device 2 in an elastic manner. Given the inclination of the openings 26a and 26b, the locking core 28 approaches the bottom of the channel 20 as it moves forward.
• the anti-lock device consequently comprises two modes of operation:
• the locking core 28 When the cable is pulled back forwards, the locking core 28 is driven forward and presses the cable on the bottom of the gutter 20 by corner effect; the cable is blocked.
• the inclination of the openings 26a and 26b, the dimensions of the blocking core 28, the thickness of the pad 30 and the diameter of the cable used are related so that this blocking occurs before the lugs 29a and 29b arrive at the end of the stroke.
• the openings 26a and 26b can be curved
• the blocking core 28 can be held pushed towards the front of the device 2 by another elastic means, such as a leaf spring.
• An element of the pulse load absorbing device 6 'for cable tensioner 3, illustrated in FIG. 6, comprises a winding 75 of deformable material, for example mild steel, so the turns are contiguous. At each of its ends this winding comprises a fixing means comprising:
• the impulse load absorber 6 of the absorber-tensioner 80 comprises two windings 75a, 75b, parallel to each other, connected at their ends by two plates 65, 76.
• the plate 65 is common to the load-absorbing device 6 and to the device charge indicator 70.
• the charge indicator device 70 illustrated in FIGS. 5A and 5B, comprises a first element consisting of a plate 65, comprising a front face 65a and a rear face 65b. Through this plate 65, the charge indicator device 70 can be attached to a device for tensioning a cable, such as the cable tensioning device 3 already described, or to an impulse load absorbing device 6. already described.
• the control device 70 comprises a second element consisting of a piece 66 in the form of a rider or shackle. This jumper comprises two substantially parallel branches 66a and 66b connected by a substantially flat portion 66c.
• the branches 66a and 66b In the vicinity of their end, the branches 66a and 66b have openings for receiving an axis 9 for fixing the device for example at the fixed point of a structure.
• the plate 65 and the rider 66 are joined by a rod 68 which passes through openings in the plate 65 and the flat portion 66c.
• the stem takes place between the branches 66a and 66b; it comprises a support piece at each end, namely a first nut 69 at its end adjacent to the front face 65a of the plate 65 and a second nut 73 between the branches 66a and 66b.
• the rod 68 could be replaced by a screw and one of the nuts be replaced by the head of the screw.
• a helical spring 72 which works in compression, so that the spring 72 maintains resiliently applied the plate 65 and the rider 66 against the first nut 69. It is therefore possible to separate these parts 65 and 66 when the tension of the cable is applied between them.
• the large branch 71a of the piece 71 is parallel to the branches 66a and 66b, in a plane offset with respect to these branches; it has an elongated opening 71b on the edges of which is a graduation 71d.
• the flat portion 66c of the rider 66 has a projecting portion 66d or index which takes place in the opening 71b.
• the spring 72 is compressed, the plate 65 and the rider 66 move apart and the projection 66d moves in the opening 71b in front of the graduation 71d.
• the large branch 71a of the part 71 thus constitutes a graduated ruler.
• the index 66d is thus fixed relative to the second element 66 and the graduation 71d fixed relative to the first element 65.
• the index 66d may be fixed relative to the plate 65 and the graduation 71 d fixed relative to the rider 66, for example carried by one of the branches 66a or 66b of said rider .
• the index 66d may be fixed relative to the rod 68 or the stop piece 69, and the graduation 71d fixed relative to the rider 66, for example carried by one of the branches 66a or 66b of said rider.
• the charge indicating device 70 may be installed between a fixed point of the structure, connected to the axis 9 and a cable tensioner 3 connected to the plate 65 via the impulse load absorber 6. When the user exerts a tension on the cable, this tension results in a displacement of the index 66d along the graduated ruler. The user thus knows the tension of the cable and can thus be warned that he has reached a sufficient voltage.
• the fastening system 90 comprises, in the extension of one another, an impulse load absorbing assembly 6, as described above, integral with a load control device. 70, already described.
• the fastening system does not include a cable tensioner, the tension can be applied to the cable by a separate tensioner.
• the impulse charge absorber 6 of the fastening system 90 comprises two windings 75a, 75b, parallel to each other, connected at their respective ends by two plates 65, 76.
• the plate 76 is an end piece of the fastening system 90, it has an end jumper 77 which allows to fix this system to a structure or a cable end.
• the plate 65 is a common element to the impulse load absorbing device 6 and the charge control device 70, said devices being distributed on either side of this common element.
• the axes of the jumper 66 and the end jumper 77 are substantially aligned, and the axes of the windings 75a, 75b are distributed symmetrically with respect to this common axis.

Landscapes

• Health & Medical Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Business, Economics & Management (AREA)
• Emergency Management (AREA)
• Electric Cable Installation (AREA)
• Fixing For Electrophotography (AREA)
• Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
• Suspension Of Electric Lines Or Cables (AREA)
• Bridges Or Land Bridges (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=43066965

Family Applications (1)

Country Status (4)

Family Cites Families (3)

• 2010
  • 2010-04-28 FR FR1053256A patent/FR2959421B1/fr not_active Expired - Fee Related
• 2011
  • 2011-04-28 EP EP11723518.4A patent/EP2563484B1/de active Active
  • 2011-04-28 WO PCT/FR2011/050958 patent/WO2011135258A1/fr not_active Ceased
  • 2011-04-28 ES ES11723518T patent/ES2742193T3/es active Active

Non-Patent Citations (1)

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