Patent Grant
8397351
This Application claims priority to PCT application No. PCT/EP2006/061616, same title herewith, filed on Apr. 14, 2006, which claimed priority to French Patent Application 05/51043, filed on Apr. 22, 2005.
This invention relates to a slide for a life-line allowing displacement along a life-line.
Such a slide constitutes an intermediate element between a life-line generally formed by a cable retained at several points by support elements anchored in a fixing surface and a harnessing system worn by a person, such as a worker working on a site where there is a risk of accidental falling.
The slide is guided along the life-line and is connected, by cable or by rope in particular, to a harness or belt worn by the individual to be made secure.
The slide may also serve to move heavy objects along the life-line.
The document FR-A-2,813,800 discloses a slide for a life-line, comprising a moving jaw, delimiting with a fixed jaw a duct for its guidance on a cable.
According to this prior art, means are provided for controlling the opening of the jaw in order to raise the slide on the cable and for completely closing the jaw if a tractive force is exerted in a handle designed to be connected by a reinforced link.
In this device the handle serving to connect the slide to the person exhibits an articulation around an axis parallel with the axis of the cable, following a limited amplitude.
WO-A-02/092171 also discloses a slide that moves in translation along a life-line and has a body delimiting a guide passage for the life-line cable.
A handle is permanently and immovably mounted on the body.
The applicant has observed that such slide configurations suffered from numerous disadvantages, particularly from the practical point of view.
In fact a resistance to sliding along the life-line, even a risk of locking, is observed in practice, for example at the intermediate supports of the life-line cable due to the tractive force exerted by the operator on the handle, which tends to swivel the latter, and hence the entire slide, giving it an orientation which is not parallel with the life-line.
Therefore very localized surfaces on the edge of the guide duct come into contact with the life-line cable, producing high concentrations of stresses generating friction and presenting risks of locking.
It will also be observed that according to the state of the art, if the user wishes to maneuver on the other side of the life-line, he must necessarily disconnect the slide from the life-line, move on the other side of the life-line, and finally re-secure himself to the cable.
All these operations are not secure, which presents a substantial disadvantage.
This invention provides a remedy to some or all of the disadvantages of the devices of prior art, and responds in particular to the needs to improve the connection between the handle and the slide section supporting the guide duct of the life-line cable.
Characteristically the invention exhibits a degree of freedom of rotation capable of preventing pivoting of the guide duct relative to the longitudinal axis of the life-line.
This avoids points of contact with high concentrations of stresses between certain isolated points on the edge of the guide and life-line cable.
The articulation between the handle and the body of the slide exhibits, in particular, a freedom of rotary movement along an axis that is perpendicular to the longitudinal axis of the guide duct, and different from the direction of traction of the connecting mechanism on the handle.
According to an advantageous embodiment, the freedom of movement thus produced has a limited movement around the axis perpendicular to the longitudinal axis of the guide duct to prevent the handle from taking a direction parallel with the longitudinal axis of the guide duct.
According to another advantageous embodiment, possibly after release of the limitation of movement of the handle, the latter may pivot at least 180° to enable the user to move on the other side of the life-line without having to detach himself from it.
More precisely, the user straddles the life-line cable, and the rotation of the handle relative to the slide body immediately adapts its position to this new configuration of use.
According to an advantageous variant, the guide duct comprises two jaws capable of being brought together or separated in order to close or open the guide duct, respectively, so that the coupling and uncoupling operations can be carried out on the life-line.
According to the invention safety means are provided to prevent any untimely opening of the guide duct.
In particular, an unlocking button is formed, a button which may possibly be combined with a release button, it being necessary to press both these buttons simultaneously or successively to open the guide duct.
Other purposes and advantages will become apparent in the course of the following description, which presents a preferred, but not exhaustive mode of the invention.
This invention relates to a slide for displacement along a life-line, comprising a body provided with a guide rove on a cable and a handle capable of interacting with an attached connecting mechanism, said handle being articulated relative to the body, characterized in that the articulation of the handle relative to the body comprises a freedom of rotary movement along an axis perpendicular to the longitudinal axis of the guide duct and different from the direction of traction of the connecting mechanism on the handle.
According to preferred but not exhaustive variants, this slide is designed so that:
The appended drawings are given as an example and do not limit the invention. They represent only one embodiment of the invention and allow it to be easily understood.
In an equivalent manner,
Guide duct 38 advantageously has an essentially circular periphery with a diameter slightly exceeding the diameter of the cable so that it results in a good sliding motion and clears the intermediate loops without difficulty.
The slide also comprises a handle 4 provided with a zone of connection to the attached connecting mechanism, for example a rope with a snap hook enabling handle 4 of the slide to be connected to an external element such as a harness worn by the user.
Any attached connecting mechanism may be used.
In particular, handle 4 comprises a section provided with an eyelet 34 for interacting with this connecting mechanism.
As shown, in particular, in
The axis of rotation 35 is perpendicular to the longitudinal axis of duct 38, and is different from the direction of traction of the connecting mechanism on handle 4, this direction generally lying in the plane of eyelet section 34.
As shown in
It will be observed that in the example shown in
In this context, axis 35 is preferably the axis of symmetry of the sphere.
According to a first embodiment, the freedom of rotary movement of axis 35 of handle 4 covers an angle of 360°, enabling it to assume any position relative to body 1.
This embodiment is particularly advantageous in that it enables the user to pass on the other side of the life-line without having to uncouple himself from it.
According to another embodiment, the movement of handle 4 is limited to an angular sector of 60°, for example, formed symmetrically around an axis perpendicular to the longitudinal axis of guide duct 38.
Such a movement is sufficient to prevent the traction of the connecting mechanism on handle 4 from giving rise to untimely pivoting of guide duct 38 relative to the life-line, whilst at the same time preventing handle 4 from assuming an orientation close to that of the longitudinal axis of duct 38.
In order to retain the possibility of using the slide 100 on the other side of the life-line without dismantling it, the invention is therefore advantageously provided with means of releasing the limitation of the angular movement of handle 4, (an angular limitation member described below).
In this manner the angular limitation may be bypassed by pressing a button 6, for example that shown in
A limitation of the movement of the handle is also advantageously formed on this side.
The possibility of limiting movement and releasing this limitation is described in greater detail below with reference to
In these figures, a release button 6, moving in translation under the action of the operator, gives rise to the displacement of a mobile mechanism 17 provided with a radial portion 18 with a stop 19 capable of interacting in an active position with a predetermined relief formed on the inner face of handle 4, as shown in
In this figure two angular sectors 36a, 36b, delimited by stop surfaces 40a, 40b, 42a and 42b, limit the sector of movement of handle 4 relative to body 1 to values of approximately 60°.
It will readily be understood that when mobile mechanism 17 is in the active position, stop 19 is displaced in one of angular sectors 36a, 36b.
On the other hand, when the operator presses release button 6 stop 19 escapes from sectors 36a, 36b, which enables the handle to be rotated fully along axis 35.
The pivot of handle 4 is itself simply formed, for example, by inserting handle 4 between a guide 23 integral with body 1 and a nut 6, fitted by means of a threaded zone 8 onto a threaded zone 24 of guide 23.
The assembly of this handle is clearly shown in
An insert ring 10 is advantageously provided between body 1 and handle 4 to limit the friction.
On the inner face of release button 6 a support lug (37), shown in
The latter is, moreover, mounted on elastic return means shown in the form of a spring 22 in
The inner volume of guide 23 serves to guide mobile mechanism 17 in a translatory movement.
In an upper section of the slide, a cover 7 enables the periphery of release button 6 to be covered so that it is protected and untimely action is prevented.
Cover 7 is mounted by clipping onto an edge formed on nut 5.
According to a first embodiment of the invention, guide duct 38 is delimited by fixed jaws 2, 3.
However, for ease of fitting and removing the slide 100 on the life-line, it is advantageous for jaws 2, 3 to perform a relative movement so that they can be brought together or separated.
Guide duct 38 may therefore be open or closed.
For this purpose, as shown in the different figures, a fixed jaw 2 is provided integral with the rest of body 1, whilst another mobile jaw 3 is articulated with an axial pivot 20 relative to body 1.
For ease of opening, a return element such as a spring 25, accommodated in housing 26 of body 1, provides an elastic return in the open position of mobile jaw 3.
In order to retain jaws 2, 3 safely in the closed position, locking means (locking mechanism) is provided.
According to the invention the opening of the locking means (locking mechanism) is conditioned by the action of the operator pressing an unlocking button 29 shown in the figures in the form of a lateral button.
It will be observed that buttons 6 and 29 shown have a translatory movement, but that a rotary action is not excluded from the scope of the invention.
As shown, button 29 exhibits an essentially vertical slot 30 capable of receiving a catch pin 28 integral with a lever 13 that pivots relative to body 1, along an axis 16.
At the end of lever 13 opposing catch pin 28, lever 13 comprises one or more teeth (primary tooth 14 and secondary tooth 15) capable of interacting with a hooking profile 27 designed to correspond to mobile jaw 3.
On the other hand,
It will be noted that it is advantageous for axis 20 of rotation of jaw 3 to be parallel with axis 35 of the freedom of movement of handle 4.
It will be readily understood that when unlocking button 29 is pressed by the user, this gives rise to rotation of lever 13, via slot 30 and catch pin 28, capable of disengaging teeth 14, 15 of hooking profile 27.
However, a default locked position is provided by means of elastic return means shown in the form of springs 32a, 32b.
It will be readily understood that any accidental or untimely opening of guide duct 38 is detrimental to safety.
In order to improve the safety of the assembly, the unlocking may be made dependent on another operation, particularly additional pressing of release button 6.
It will be noted, however, that a third button could be formed in order to condition the operation of the unlocking means.
The unlocking may therefore be made dependent on a predefined position of handle 4, for example in released operation and parallel with the axis of guide duct 38.
However, in the case illustrated, pressing release button 6 is required to set lever 13 in motion in combination with unlocking button 29.
More precisely, pressing release button 6 gives rise to a lowering of mobile mechanism 17, whose radial portion 18, which up till that point rested on one side of lever 13, releases it, enabling lever 13 to rotate when the user presses unlocking button 29.
Release button 6 therefore has two functions because it contributes both to the release of the limitation of angular movement of handle 4 and to the actuation of the unlocking means.
It will be noted that the locking and unlocking mechanism previously described may be used in a slide 100 of the conventional type that does not provide for the rotary movement of handle 4 relative to the body along previously defined axis 35.
In the different figures, a plurality of rollers 31a, b, c, d is present and is inserted in housings configured to position rollers 31a, b, c, d on the walls of guide duct 38 to facilitate the displacement.
In particular, two rollers 31a and b are mounted on fixed jaw 2, and two other rollers 31c and d are mounted on mobile jaw 3.
Finally it will be noted that guide 23 exhibits a vertical slot that enables mobile mechanism 17 to perform a translatory movement.
Similarly,
It will be readily understood that the slide thus described exhibits a high degree of compactness whilst ensuring optimum safety.
Moreover, the movement between handle 4 and the section supporting guide duct 38 enables the slide 100 to be displaced satisfactory along the life-line without a friction point.
| Number | Date | Country | Kind |
|---|---|---|---|
| 05 51043 | Apr 2005 | FR | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2006/061616 | 4/14/2006 | WO | 00 | 10/17/2007 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2006/111513 | 10/26/2006 | WO | A |
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