WO2014041308A1

WO2014041308A1 - Safety line

Info

Publication number: WO2014041308A1
Application number: PCT/FR2013/052097
Authority: WO
Inventors: Damien Sequera; Thomas Manfredotti
Original assignee: Soream
Priority date: 2012-09-12
Filing date: 2013-09-12
Publication date: 2014-03-20
Also published as: FR2995216B1; FR2995216A1

Abstract

The invention relates to a safety line comprising a strap receiving, on each of the two ends thereof, a safety hook (3) to be hooked onto a lifeline (2) comprising a ferromagnetic cable (20), each safety hook (3) comprising a bail (31) provided with an oscillating closing element (32), and each safety hook being provided with a mechanism for locking-unlocking the closing element (32), actuated by a handle (4) and mechanically connected to the mechanism of the other safety hook (3) by means of a Bowden cable (5), said mechanisms comprising: a cam (6) mounted in the safety hook from an initial position according to which the closing element (32) is open and the closing element (32) of the other safety hook (3) is blocked in a closing position; and a magnetic detector (7) for detecting the presence of the cable (20) in the bail (31) of the safety hook, that can prevent any return movement of the cam (6) in the absence of the lifeline in the bail (31).

Description

SECURITY LENGTH

Technical area.

The present invention is in the field of equipment used to ensure a person moving in height or around a dangerous area and relates more particularly to a safety lanyard provided with two end carabiners interacting with each other .

State of the art

Typically, the safety lanyards are formed of a strap having at each of its two ends a safety carabiner adapted to be engaged in a sliding manner, on a lifeline, a Via Ferrata or others. Usually, the strap has mid-distance from both ends, a ring attachment to a harness worn by the person to be insured. The carabiners interact with each other in the sense that the opening of one prohibits the opening of the other and vice versa. This provision is intended to increase the safety level of the lanyard especially when crossing the points of attachment of the lifeline or via ferrata.

Such safety lanyards are in particular known from patent applications WO2008 / 049143, WO2008049899, EP 2,145,651 and EP 2,314,355.

Summary of the invention.

Statement of the problem.

Known devices are not equipped with means for detecting the presence of a lifeline in the carabiner so that devices can be hooked to a link not provided for a security function and backup.

Presentation of the solution.

The present invention aims to solve the problem mentioned above.

For this purpose the safety lanyard according to the invention for the use of a user to ensure, comprising a strap receiving at each of its two ends a carabiner provided to be attached to the ferromagnetic cable of a lifeline, and between its two ends, a hooking loop to a harness worn by a person to ensure, each carabiner comprising a carabiner body forming a housing in the lower part and a hook in the upper part defining a handle for receiving the cable from the line of life, this handle being provided with an opening with which is associated a rocking clasp, which can occupy a closed position in which it closes the opening of the handle and an open position according to which it releases the opening and is located in the handle formed by the carabiner, each carabiner being provided with:

- An actuating handle, mounted in an articulated manner in the carabiner body, said handle being provided to be actuated by the user between an initial position of rest and a final actuating position,

- A locking mechanism-unlocking the clasp, actuated by the handle, which mechanism is mechanically connected, by a Bowden transmission, to the locking-unlocking mechanism of the other carabiner, said transmission consisting of a sheath secured by its ends to the two carabiners and a cable slidably mounted in said sheath and fixed at both ends to the locking-unlocking mechanisms of the two carabiners,

is essentially characterized in that the locking-unlocking mechanism of each carabiner includes:

a clasp foot rigidly fixed to the clasp or forming a body with said clasp,

a cam mounted in articulation in the casing of the carabiner body, receiving in fixing one of the two ends of the cable of the Bowden transmission, said cam, from an initial position, which can be arranged:

- Or, under the effect of the actuation of the associated handle to its final actuating position, in a first angular position, in which the clasp is open or can be opened and that under the effect of the traction that 'it exerts on the cable, the clasp of the other carabiner is locked in the closed position and the handle of this other carabiner locked in the rest position,

- Or under the effect of the action of the cable, in a second angular position, opposite to the previous one, according to which it acts on the one hand on the associated handle to maintain it in the rest position and prohibit the actuation and on the other hand on the associated clasp to hold said clasp in the closed position,

a magnetic sensor for the presence of the cable of a lifeline in the snap hook, mounted in articulation in the carabiner body between a first angular position and a second angular position, said detector being able to prohibit, firstly angular position, after actuation of the handle to its final actuating position, and in the absence of detection of lifeline in the loop, any return movement of the cam to its initial position, from its first angular position and either by direct action on the cam, or by action on the clasp.

Thus, the clasp of the carabiner can not be closed if no lifeline is detected in the snap hook and the clasp of the other carabiner can not be opened to be released from the lifeline, the cam this other clasp being held in its second angular position by the traction exerted on the Bowden transmission cable by the cam of the first carabiner. On the other hand, the presence of the cable of a lifeline in the carabiner's snare will force the detector to pivot towards its second angular position. The clasp and the cam will then be released and the corresponding carabiner will close on the lifeline. The clasp of the other carabiner can then be moved to its open position to be removed from the lifeline. These provisions greatly improve safety, especially when crossing the points of attachment of the lifeline and during changes in life lines.

The safety and ease of use of the lanyard according to the invention are thus increased.

According to another characteristic of the invention, the cam of the locking-locking mechanism of each carabiner, has a radial actuating arm, forming a lever, on which the handle acts when said handle from its rest position is actuated to its final position, said cam then being driven from its initial position towards its first angular position.

According to another characteristic of the invention, the actuation arm of the cam of the locking-unlocking mechanism of each carabiner, when said cam is arranged in its second angular position, acts on the handle to prevent the maneuver to its position final

actuating.

According to another characteristic of the invention, the cam of the locking mechanism unlocking each carabiner, has a locking arm coming, when the cam is arranged in its second angular position, act on the clasp foot to keep the clasp in the closed position.

According to another characteristic of the invention, the cam of the locking-unlocking mechanism of each carabiner is provided with a lever-forming pulling arm to which is fixed one of the ends of the cable of the Bowden transmission.

According to another characteristic of the invention, the magnetic sensor of the locking-unlocking mechanism of each carabiner, is formed of a lever articulated to the carabiner body, said lever having at one of its two ends a magnetic head and to the another end a stop foot, said lever being biased by a resilient member to a first angular position according to which, by its abutment foot, it is arranged on the path of either the clasp or the cam to prevent the return of this cam to its initial position from its first angular position.

According to another characteristic of the invention, the magnetic head that comprises the detector is arranged opposite the handle formed by the hook.

Brief presentation of figures and drawings.

Other advantages, aims and features of the invention will appear on reading the description of a preferred embodiment given by way of non-limiting example with reference to the appended drawings, in which:

FIG. 1 is a view of a lanyard according to the invention comprising carabiners according to a first embodiment,

FIGS. 2 to 9 illustrate the operating mode of the lanyard according to FIG. 1,

FIG. 10 is a view of a lanyard comprising carabiners according to a second embodiment,

- Figures 11 to 19 illustrate the operating mode of the lanyard according to Figure 10.

Best way to realize the invention.

The attached figures is shown a safety lanyard 1 for use by a person to be insured, having to work at height or around a potentially dangerous zone, this safety lanyard 1 to be attached to a lifeline 2 formed a ferromagnetic cable 20, supported from place to place by attachment points to a structure which can be without limitation, a building, the deck of a ship, etc. The lifeline can also be that of an acrobatic course in height such as via ferrata, and other.

As represented by the lanyard, according to the invention, comprises a flexible strap, not shown, able to withstand very strong traction, receiving at each of its two ends a carabiner 3 provided to be hooked to the cable 20 of the lifeline 2. Between its two ends, the strap receives an attachment loop to a harness worn by a person to be insured. The attachment loop and the harness are not shown in the figures.

Each carabiner 3 of the lifeline comprises a carabiner body 30 forming a hook at the top and a casing at the bottom. The hook defines a handle 31 provided to receive the cable 20 of the lifeline 2, this handle 31 being provided with an opening with which is associated a clasp 32 that can occupy either a closed position in which it closes the opening of the 'anse, a position open in which it deploys in the loop, the opening then being cleared for the passage or removal of the cable 20 of the lifeline 2. The clasp is biased to the closed position by a not shown elastic member. The closed position of the clasp 32 defines a closed state of the carabiner, while the open position of the clasp defines an open state of the carabiner.

The clasp 32 comprises a clasp foot 320 rigidly fixed to the clasp or forming a body with said clasp. This clasp 32 is articulated by its foot to the carabiner body 30 and more particularly to the housing that forms said body. The foot 320 enters the housing to cooperate with locking-unlocking mechanism mounted in said housing and actuated by a handle 4 for the use of the user. This handle 4 is articulated to the casing of the carabiner body and is movably mounted between a rest position and a final actuating position. An elastic member, not shown, biases the handle 4 towards its rest position.

The locking-unlocking mechanism that each carabiner comprises is mechanically connected by a Bowden transmission 5 to the locking-unlocking mechanism of the other carabiner so that actuation of the locking-unlocking mechanism of one of the carabiners prohibits the locking mechanism. actuation of the locking-unlocking mechanism of the other carabiner.

Thus, when the handle 4 of one of the carabiners is actuated in the opening direction of this carabiner, the other carabiner is kept in a closed state.

As known, the Bowden transmission 5 is constituted by a sheath 50 fixed at its ends to the two carabiners 3 and more particularly to the casings of these carabiners via a sheath stop, mounted in a piercing through said body, and by a cable 51 slidably mounted in the sheath and fixed at both ends to the locking-unlocking mechanisms of the two carabiners.

According to the invention, the locking-unlocking mechanism comprises the clasp foot 320, a cam 6 mounted in an articulated manner in the casing of the carabiner body 30, and a magnetic sensor 7 for the presence of the cable 20 of the lifeline. 2 in the handle 31 of the carabiner.

The cam 6 comprises a central hub 60 by which it is mounted in articulation on an axle mounted in fixing in the casing of the carabiner body 30. This cam 6 also comprises a radial traction arm 61, forming a lever, receiving in fixing distance from the hinge pin, the corresponding end of the cable 51 of the Bowden transmission 5. It further comprises a radial arm of actuation 62 on which the handle 4 acts and more particularly an actuating surface 40 that comprises the handle 4. It can be observed that in the initial position of the cam 6, the arm 62 occupies an oblique position relative to the surface of the cam. actuation 40 to facilitate the operation of the cam by the handle 4.

Under the effect of the action of the handle 4, the cam 6, from an initial position, is pivotally arranged in a first angular position, according to which the clasp 32 is open or can be opened and according to which under the effect of the traction it exerts on the cable 51, the clasp 32 of the other carabiner is locked in the closed position and the handle 4 of the other carabiner, is locked in the rest position. According to this first angular position, the cam 6 is spaced angularly from its initial position.

Under the effect of the traction action exerted by the cable 51, the cam 6 from its position initial, is disposed in a second angular position, spaced angularly from said initial position and opposite to the first angular position. According to the second angular position, the cam 6 acts on the one hand on the associated handle 4 to maintain it in the rest position and prohibit actuation and on the other hand on the clasp 32 associated to maintain this clasp in the closed position . According to the second angular position of the cam 6, the actuating arm 62 of said cam acts on the handle 4 to prohibit the maneuver and thus maintain it in the rest position. In this position, the actuating arm 62 is substantially orthogonal to the actuating surface 40.

The initial position of the cam 6 is an intermediate position between the first and second angular positions of the cam. The cam is biased towards its initial position by a not shown elastic member.

Additionally, the cam 6 of the locking-unlocking mechanism of each carabiner 3 has a locking arm 63 acting, when said cam is arranged in its second angular position, on the foot 320 of the clasp 32 to maintain the clasp in the closed position.

These provisions therefore prohibit, when the cam 6 is arranged in its second angular position, both the operation of the handle 4 that the maneuver of the clasp 32. In this way the carabiner 3 corresponding remains in engagement with the lifeline 2 and can not to be extracted.

A cam 6 is associated with an elastic member, not shown, which urges it towards its initial position.

The magnetic sensor 7 for the presence of the cable of a lifeline in the snare 31 of the carabiner 3, is hingedly mounted in the body of the carabiner and more precisely in the hook portion of this body, and this is the opposite of the opening of the handle. This detector 7, is mounted angularly movable between a first angular position and a second angular position, is able to prohibit, according to its first angular position, after actuation of the handle 4, and in the absence of the cable 20 of the line 2 in the loop 31 of the carabiner 3, any return movement of the cam 6 to its initial position from its first angular position. In this way the corresponding carabiner is kept in the open state and the other carabiner is kept in the closed state.

According to a practical embodiment, the magnetic sensor 7 of the locking-unlocking mechanism of each carabiner, is formed of a lever articulated to the carabiner body. This lever has at one of its two ends, namely the upper end, a magnetic head 70 formed of a magnet and at the other end an abutment foot 71. The upper end of the lever corresponds to that located next to the cove. The lower end of this lever is located in the housing that forms the carabiner body. This magnetic detector 7 is biased by an elastic member, not shown, towards the first angular position according to which by its abutment foot 71 it is arranged in the path, either of the clasp 32 or of the cam 6 to prevent the return of this cam towards its initial position since its first angular. The presence of the cable of a lifeline in the handle 31 of the carabiner, under the effect of the magnetic attraction between said cable and the head 70, forces the pivoting of the detector 7 towards its second angular position or ensures the maintenance of this detector in this second angular position.

In Figures 1 to 9 is shown a first embodiment of a lanyard according to the invention. According to this embodiment, the clasp 32 of each carabiner 3 is driven to its open position by the movement of the associated cam 6, movement effected from the initial position of said cam 6 to its first angular position due to the actuation of the handle 4. Thus, the actuation of the handle 4 causes the pivoting of the cam 6 to its first angular position and simultaneously the opening movement of the clasp 32. Conversely the movement of the cam 6 from its first angular position towards its initial position causes the closing movement of the clasp 32. For this purpose the clasp 32 of each carabiner 3, on at least part of its path, between the closed position and the open position and vice versa, by its foot 320 cooperates in meshing with the cam 6 of the corresponding locking-unlocking mechanism. In a practical embodiment, the meshing relationship is established by a radial drive arm 64 that has the cam 6 and by a hollow 321 formed in the foot 320 of the clasp 32, this recess 321 being provided to receive the end of said arm 64. It should be noted that the meshing relationship is established between the initial position of the cam and the first angular position of this cam and vice versa.

Still according to this embodiment, the magnetic sensor 7 of the locking-unlocking mechanism of each carabiner, in the open position of the clasp and in the absence of a lifeline in the handle 31 of the carabiner, under the effect of its organ elastic, is disposed by its abutment foot 32 against the foot 320 of the clasp 32 and more particularly in the path of an abutment surface 322 that includes this foot 320. In this way, the clasp 32 is immobilized in the open position and the cam 6 is immobilized in its first position. By keeping the cam 6 of this first carabiner in its first position, the cam 6 of the locking-unlocking mechanism of the other carabiner will be held in its second angular position and will act by its arm 62 on the handle 4 and by its arm 63 on the clasp 32 to prohibit the maneuver. More specifically, in this second angular position, the arm 62 is substantially normal to the actuating surface 40 of the handle 4 and the arm 63 is disposed on the path of the clasp 32 between its closed position and its open position and more particularly against a surface 324 of the clasp foot, opposite the previous one. Thus, this other carabiner will be kept in the closed state and can not be cleared from the lifeline.

On the other hand, the presence of the cable 20 of the lifeline in the loop 31 of the first carabiner and close to the magnetic head of the detector 7 will force the tilting of this detector towards its second angular position according to which by its foot 71, it is disengaged from the path of the foot 320 of the clasp 32. The clasp 32 and the cam 6 are thus released and under the effect of the action of the resilient member associated with the cam 6, respectively return to the closed position and in initial position. The cable 51 is then relaxed and the handle of the other carabiner can then be actuated to maneuver the associated clasp 32 to its open position. This other carabiner can then either be removed from the lifeline 4 and in which case the detector 7 under the effect of the action of its resilient member switches to its first angular position, or be engaged on the ferromagnetic cable 20 of another lifeline in which case the detector 7 will switch, after detection of the cable 51, to its second angular position.

Referring to FIGS. 2 to 9, the operating mode of the lanyard according to FIG. 1 will be explained. The first carabiner will be the carabiner on the left in the figures and the second on the right in these figures.

FIG. 2 shows a lanyard awaiting attachment to the cable 20 of a lifeline. The clasps 32 of the two carabiners are in the closed position, the handle 4 of each carabiner is located in the rest position and the cam of each locking-unlocking mechanism is located in position initial. In addition, the detector 7 of each of the two carabiners, by its foot 71, is disposed against a front surface 323 of the foot 320 of the clasp 32 of the corresponding carabiner without prohibiting the pivoting movement of this clasp. This detector 7, in this situation, occupies an intermediate angular position between its first angular position and its second angular position.

In Figure 3, the handle 4 of the first carabiner, under the effect of the action exerted by the hand of the user, is disposed in the final actuating position. During its movement, from the rest position to the final operating position, the handle 4 by its actuating surface 40 acted on the actuating arm 62 of the cam 6 and forced this cam to pivot towards its first angular position. During this movement, the driving arm 64 is engaged in the hollow 321 of the foot 320 of the clasp 32 and has caused this clasp to its open position. The detector 7 has tilted towards its first angular position and its foot 71 has come to lie opposite and against the abutment surface of the clasp foot thus ensuring the clasp is held in the open position and the cam is held in the first angular position. The cam 6 or course of its movement, from the initial position to the first angular position, acted in tension through its arm 61 on the cable 51 of the Bowden transmission so that the cam 6 of the locking mechanism- The locking of the second carabiner has been maneuvered from its initial position to its second angular position, thus leading to the locking of both the handle 4 and the clasp 32, in the closed position, of the second carabiner. In the situation of Figure 3, the first carabiner is in the configuration of attachment to the cable 20 of a lifeline.

In Figure 4 it can be seen that the first carabiner is engaged on the lifeline and that the detector 7, under the effect of the magnetic attraction to the cable 20 has rocked to its second angular position. The foot 71 of the detector is no longer in the path of the abutment surface 322, the clasp 32 and the cam 6 were released and were able to join respectively their closed and initial position. The cable 51 was relaxed and the cam 6 of the second carabiner was able to return to its initial position thus placing said second carabiner in an unlocked position.

In Figure 5 it can be seen that the handle 4 of the second carabiner is actuated thus forcing the locking of the first carabiner in the closed position on the lifeline. In the situation of Figure 5, the clasp of the second carabiner is open and the second carabiner is being engaged on the cable 20 of the lifeline.

In the situation of FIG. 6, the second carabiner has closed on the cable 20.

In the situation of Figure 7 the first carabiner is open and is not yet clear of the lifeline and the second carabiner is locked due to the opening of the first. The detector 7 of the first carabiner due to the presence of the lifeline in its handle 31 is always in second angular position.

In the situation of FIG. 8, the first carabiner 3 is being withdrawn from the lifeline and the detector 7 of this first carabiner 3 has tilted towards its first angular position in order firstly to lock the first carabiner in the open position. by acting on the surface 322 of the foot of the clasp 32 and secondly keep the second carabiner in the closed locked position even if the handle 4 of the first is released and returns to the rest position.

In the situation of Figure 9, the first carabiner is again engaged on the cable 20 of the lifeline after crossing a point of attachment or on a new lifeline. The detection of the cable in the handle of the first carabiner brings the detector 7 back to the second angular position.

According to the embodiment object of Figures 10 to 19, the clasp is biased towards its closed position by a resilient member and does not cooperate in meshing with the cam 6. According to this embodiment, the actuation of the handle 4 does not not translated by the drive of the clasp 32 to its open position but by the release of this clasp. More specifically, the cam 6 is driven by the handle 4 and releases the clasp 32.

Still according to this embodiment, the foot 71 of the detector 7 is arranged in a hook. In combination with this feature, the locking arm 63 of the cam 6 is provided at the end with a hook shape adapted to cooperate with the hook shape of the foot 71 of the detector 7 in order to retain the cam in its first angular position. .

Referring to Figures 11-19 we will now explain the operating mode of the lanyard according to the second embodiment. The first carabiner will be the left carabiner on the figures and the second carabiner on the right in these figures.

FIG. 11 shows a lanyard awaiting attachment to the cable 20 of a lifeline. The clasps 32 of the two carabiners are in the closed position, the handle 4 of each carabiner 3 is located in the rest position and the cam 6 of each locking-unlocking mechanism is located in the initial position. The detector 7 is in first angular position.

In the situation of Figure 12, the handle 4 of the first carabiner is located in the final actuating position. During its movement from the rest position to the final operating position, the handle 4 by its actuating surface 40 acted on the actuating arm 62 of the cam 6 and forced this cam to pivot towards its first angular position. In this first angular position, the hook formed by the end of the arm 63 has engaged with the hook formed by the foot 71 of the detector 7. This arrangement ensures the temporary maintenance of the cam 6 in its first angular position. During the movement from the initial position to the first angular position, the cam 6 of the first carabiner 3 acted in traction through its arm 61 on the cable 51 of the Bowden transmission so that the cam 6 of the mechanism locking-unlocking the second carabiner 3 has been maneuvered from its initial position to its second angular position, thus leading to the locking of both the handle 4 and the clasp 32, in the closed position, this second carabiner. More specifically, in this second angular position, the arm 63 of the cam 6 of the second carabiner 3 bears at its end on the front surface 323 of the clasp foot 320 and the end of the arm 62 bears against the surface of the clasp. actuation 40 of the handle 4 of the second carabiner. The clasp 32 of the first carabiner 3 can then be maneuvered by the user to its open position to engage the first carabiner on the lifeline.

In the situation illustrated in FIG. 13, the cable 20 of the lifeline is present in the loop 31 of the first carabiner 3 and has been detected by the detector 7. As a result, this detector is returned to its second angular position and the Cam 6 of the first carabiner was released because the hook formed by the end of the arm 63 and the hook formed by the foot 71 of the detector 7 are no longer in engagement with each other. Under the effect of the associated elastic member, this cam 6 of the first carabiner is returned to its initial position which resulted in the unlocking of the second carabiner 3.

In the situation illustrated in FIG. 14, the handle 4 of the second carabiner 3 is actuated and has driven associated cam 6 to its second angular position thereby forcing the locking of the first carabiner on the lifeline. The clasp 32 of the second carabiner 3 can then be maneuvered in opening to engage the second carabiner 3 on the cable 20 of a lifeline as can be seen in FIG.

In the situation of Figure 16, the two carabiners 3 are closed on the lifeline, the clasps 32 are in the closed position and the handles 4 are in the rest position.

In the situation of FIG. 17, relative for example to a change of life line, the handle 4 of the first carabiner 3 is actuated and the clasp 32 is maneuvered by the user towards its open position. Maneuvering the handle 4 of the first carabiner 3 resulted in the actuation of the cam 6 of the first carabiner 3 to its first angular position without this cam clings to the hook shape of the foot 71 of the detector 7. Maneuvering the handle 4 of the first carabiner 3 has resulted in the locking of the clasp 32 of the second carabiner 3 in the closed position and the locking of the handle 4 of the second carabiner in the rest position. The cable 20 of the lifeline still being in the handle 31 of the first carabiner, the detector 7 is maintained because of the magnetic attraction in its second angular position. The second carabiner 3 is locked due to the actuation of the handle 4 which holds the cam 6 of the first according to its first angular position.

In the situation of FIG. 18, the first carabiner 3 is being withdrawn from the lifeline and the detector 7, under the effect of the action of the associated elastic member, has joined, by tilting, its first angular position. Its foot 71 in the form of a hook now cooperates in gripping with the hook shape that includes the arm 63 of the cam 6 and ensures the maintenance of this cam in its first angular position. Due to this angular position of the cam 6 of the first carabiner 3, the second carabiner is kept in a locked state. The handle 4 of the first carabiner 3 can be released without affecting the condition of the second carabiner.

In the situation of Figure 19, the first carabiner is again engaged on the cable 20 of the lifeline, after crossing a point of attachment, or on a new lifeline. The detection of the cable 20 in the loop 31 of the first carabiner 3 brings the detector 7 of the first carabiner into its second angular position.

At the end of the course in order to leave the course will be arranged on a suitable support at least one ferromagnetic rod to simulate the presence of a ferromagnetic cable. One of the two ends of this rod is free. One of the two carabiners 3, for example the second, will be engaged on this protruding metal rod and the presence of this rod will be detected by the detector 7 of the second carabiner 3. This second carabiner then, will join its second angular position. This carabiner 3 can then be removed from the metal rod without being actuated. Such a situation corresponds to that which is the subject of FIG. 4 as regards the first embodiment and to that object of FIG. 13 as regards the second embodiment.

Then the first carabiner 3 can be removed from the cable 20 of the lifeline 2 and for this purpose, its handle 4 will be actuated to release the clasp 32. The actuation of the handle 4 of the first carabiner will cause the locking of the clasp 32 the second carabiner. The first carabiner can then be engaged on the ferromagnetic rod so that the two carabiners are found in the state of Figures 2 and 11 corresponding to the beginning of a course.

Claims

1 / safety lanyard for the use of a user to ensure, comprising a strap receiving at each of its two ends a carabiner (3) adapted to be attached to a lifeline (2) comprising a ferromagnetic cable (20) , and between its two ends, a hooking loop with a harness carried by a person to ensure, each carabiner (3) comprising a carabiner body (30) forming a housing in the lower part and a hook in the upper part defining a handle (31) provided to receive the lifeline (2), this handle (31) being provided with an opening which is associated with a clasp (32) tilting, which can occupy a closed position in which it closes the opening of the handle (31) and an open position according to which it releases the opening and is located in the loop formed by the carabiner, each said carabiner being provided with:

- an actuating handle (4), mounted in an articulated manner in the carabiner body, said handle (4) being provided to be actuated by the user between an initial rest position and a final actuating position,

- A lock-unlocking mechanism of the clasp (32), actuated by the handle (4), which mechanism is mechanically connected by a Bowden transmission (5) to the locking-unlocking mechanism of the other carabiner (3), said transmission being constituted by a sheath (50) fixed at its ends to the two carabiners (3) and by a cable (51) slidably mounted in said sheath (50) and fixed at both ends to the locking-unlocking mechanisms of the two carabiners, characterized in that the locking-unlocking mechanism of each carabiner (3) comprises: - a clasp foot (320) rigidly fixed to the clasp (32) or forming a body with said clasp,

a cam (6) hingedly mounted in the casing of the carabiner body, receiving by fixing one of the two ends of the cable (51) of the Bowden transmission (5), said cam (6), from an initial position, able to be arranged:

- Or, under the effect of Γ actuation of the handle (4) associated to its final position

actuating means, according to a first angular position, according to which the clasp (32) is open or can be opened and that under the effect of the traction it exerts on the cable (51), the clasp (32) of the other carabiner (3) is locked in the closed position and the handle (4) of the other carabiner locked in the rest position,

- Or under the effect of the action of the cable (51), in a second angular position, opposite to the previous one, in that it acts on the one hand on the handle (4) associated to maintain it in the rest position and prohibiting the actuation and secondly on the clasp (32) associated to maintain said clasp in the closed position,

a magnetic sensor (7) for the presence of the cable (20) of a lifeline in the loop (31) of the carabiner, articulated in the body of the carabiner between a first angular position and a second angular position, this said detector (7) being able to prohibit, in first angular position, after actuation of the handle (4), towards its final operating position and in the absence of life-line detection in the handle (31), any return movement of the cam (6) to its initial position, from its first angular position and either by direct action on the cam, or by action on the clasp.

2 / safety lanyard according to claim 1, characterized in that the cam (6) of the locking-unlocking mechanism of each carabiner (3), has a radial arm (62) for actuation, forming a lever, on which the handle (4) acts when said handle from its rest position is actuated to its final position, said cam (6) being then driven from its initial position to its first angular position.

3 / safety lanyard according to claim 1 or claim 2, characterized in that the actuating arm (62) of the cam (6) of the locking-unlocking mechanism of each carabiner (3), when said cam (6) ) is arranged in its second angular position, acts on the handle (4) to prohibit the maneuver.

4 / safety lanyard according to any one of the preceding claims, characterized in that the cam (6) of the locking-unlocking mechanism of each carabiner (3), has a locking arm (63) coming, when the cam ( 6) is arranged in its second angular position, act on the clasp foot (320) to keep the clasp (32) in the closed position.

5 / safety lanyard according to any one of the preceding claims, characterized in that the cam (6) of the locking-unlocking mechanism of each carabiner (3) is provided with a pull arm (61) forming a lever is fixed at one end of the cable (51) of the Bowden transmission (5).

6 / safety lanyard according to any one of the preceding claims, characterized in that the magnetic sensor (7) of the locking-unlocking mechanism of each carabiner (3) is formed of a lever articulated to the carabiner body, said lever having at one of its two ends a magnetic head (70) and at the other end an abutment foot (71), said lever (7) being biased by an elastic member towards a first angular position according to which, by its foot stop, it is arranged on the path, either of the clasp (32) or the cam (6) to prohibit the return of this cam to its initial position from its first angular position.

11 safety lanyard according to the preceding claim, characterized in that the magnetic head (70) that comprises the detector (7) is disposed opposite the handle (31) that forms the hook.

8 / safety lanyard according to claim 6 or claim 7, characterized in that the detector (7) of the locking-unlocking mechanism of each carabiner, in the open position of the clasp and in the absence of the cable (20) of the life line in the handle (31) of the carabiner (3) is arranged by its foot (71) against the foot (320) of the clasp to immobilize said clasp in the open position and the cam (6) in the first angular position .

91 Safety lanyard according to any one of the preceding claims, characterized in that the clasp (32) of each carabiner (3) is driven towards its open position by the movement of the cam (6) associated, from the initial position of this cam towards its first angular position, the clasp (32) of each carabiner (3), on at least part of its path, between the closed position and the open position and vice versa, by its foot (320) co-operating in meshing with the cam (6) of the corresponding locking-unlocking mechanism.

10 / safety lanyard according to the preceding claim, characterized in that the cam (6) of the locking-unlocking mechanism of each carabiner (3) has a drive arm (64) acting on the foot (320) clasp (32) when said cam (6) is driven between its initial position and its first angular position and vice versa, so that the clasp (32) is driven by the movement of said cam (6). 11 / safety lanyard according to the preceding claim, characterized in that the foot (320) of the clasp (32) of each carabiner (3), has at the periphery a recess (321) provided to receive the end of the drive arm (32) of the cam (6) of the corresponding locking-unlocking mechanism, for the purpose of establishing the meshing relationship between the clasp (32) and the cam (6).

12 / safety lanyard according to claim 6 or claim 7, characterized in that the foot

(71) of the detector (7) of the locking-unlocking mechanism of each carabiner is arranged in a hook.

13 / safety lanyard according to claims 6 and 12 taken together, characterized in that the end of the locking arm (63) of the cam of the locking-unlocking mechanism of each carabiner (3) is end equipped with a form of hook provided to cooperate in hooking with the hook shape of the foot (71) of the detector (7) after maneuvering the handle (4) and in the absence of lifeline (2) in the handle (31). ) to maintain the cam (6) at its first angular position.