Device for detecting threshold speed of clamping device and clamping device for wire element

Abstract

A device for detecting a threshold speed of a clamping device comprises a roller (2) rotating about an axis. The member (4) is fixed to the roller (2). The component (4) is designed to be in contact with the clamp (5). The member (4) is mounted so as to be movable relative to the axis to contact or not contact the clamp (5). The rotation of the roller (2) generates a centrifugal force designed to move the member towards the clamp (5). When the rotational speed of the roller (2) reaches a threshold value, the member is in contact with the jig to block the roller (2). The member (4) has a flyweight (4b) and a ratchet (4c) separated by a plane perpendicular to the first axis of rotation of the roller (2). The plane is offset relative to a contact surface between the member and the clamp. The flyweight (4b) is further away from the axis in the radial direction than the contact area with the clamp. A clamping device for a wire element comprises a device for detecting the threshold speed of the clamping device.

Description

Technical Field

[0001] The utility model relates to a detection device for a threshold speed of a clamping device and a clamping device for a line element. Background Art

[0002] When working at height, in order to ensure the safety of the person performing the operation, it is necessary to connect the person to a rope that acts as a lifeline. The person is tied to a fall arrester that extends along the lifeline. The fall arrester has a rotating roller that is configured to rotate in one direction or the other, depending on whether the person is ascending or descending.

[0003] In the event of a fall, the vertical speed of the fall arrester along the lifeline reaches a threshold value, which corresponds to a threshold rotational speed of the rollers relative to the plate of the fall arrester. When the threshold rotational speed is reached, the rollers jam, which has the effect of blocking the fall arrester on the lifeline. The person tied to the fall arrester is then prevented from falling.

[0004] In order to create an effective and user-friendly fall arrester, it is important that the fall arrester closely follows the progress of the rope service technician, i.e. the fall arrester moves with low friction in one direction or the other. It is also important for the fall arrester to effectively detect the speed at which the fall arrester runs along the lifeline, which corresponds to a strong contact between the roller and the lifeline and therefore to a non-negligible friction.

[0005] Documents US2014 / 0196985 and US2014 / 0196989 disclose the configuration of a fall arrester.

[0006] In the configuration disclosed in document US2014 / 0262611, the roller rotates until it reaches a threshold rotational speed. Once the threshold rotational speed is reached, the roller gets stuck. The roller is mounted to rotate around an axis of rotation. Two components are movably mounted inside the roller, and each component is actuated by a spring configured to bias them toward the axis of rotation. When the rotational speed of the roller increases, centrifugal force tends to move the components outward, thereby contacting the clamp. Once the components are in contact with the clamp, the roller can no longer rotate. Each component has a contact surface with the clamp that extends over the entire height of the component and the entire height of the clamp. The clamp and the components are located outside the roller, which makes the device relatively bulky.

[0007] In order to obtain an effective fall arrester, it is necessary to have a good detection of the rotation speed of the roller in order to effectively detect that a threshold speed has been reached. This naturally manifests itself in forming a fall arrester of large dimensions in order to have a good reactivity when speed changes occur. Utility Model Content

[0008] An object of the utility model is to provide a detection device for a threshold speed of a clamping device, which is configured to detect the rotation speed of a roller of the rope clamping device and provides a better balance between the size of the detection device and the sensitivity of speed detection.

[0009] According to one feature of the utility model, a detection device for a threshold speed of a clamping device is provided, which is configured to detect the rotation speed of a roller of the clamping device of a line element, comprising:

[0010] - a roller mounted for rotation about a first rotation axis, the first rotation axis defining a first rotation axis of the roller, the first rotation axis being fixed to the body;

[0011] - a clamp fixed to the body and having a first contact surface;

[0012] - at least one member fixed to the roller so as to rotate about the first rotation axis in an annular volume arranged between the first rotation axis and the clamp, the at least one member having a second contact surface, the at least one member being mounted to be movable relative to the first rotation axis between a first member position and a second member position, in the first member position the second contact surface is not designed to hinder the rotation of the at least one member, in the second member position the second contact surface is designed to contact the first contact surface, the rotation of the roller generates a centrifugal force designed to move the second contact surface away from the first rotation axis and to move the member to the second member position, so that when the rotation speed of the roller reaches a threshold rotation speed the second contact surface contacts the first contact surface, and when the first contact surface contacts the second contact surface the clamp blocks one rotation direction of the roller.

[0013] The detection device is notable in that the member has a flyweight portion and a ratchet element arranged successively in a direction parallel to the first rotation axis, the ratchet element comprising a second contact surface;

[0014] In the second member position, the flyweight portion is not in contact with the clamp; and

[0015] When viewed along the first rotation axis, a distal end portion of the flyweight portion is further away from the first rotation axis than a distal end portion of the second contact surface.

[0016] Advantageously, in the first member position, a radial distance between the first rotation axis and a distal portion of the flyweight portion is greater than a radial distance between the first rotation axis and a proximal portion of the first clamping area.

[0017] In a particular configuration, the roller is hollow and the clamp is arranged inside the roller.

[0018] In an advantageous development, the component is mounted so as to be rotatable about a second rotation axis between a first component position and a second component position, the second rotation axis being mounted so as to be rotatable about the first rotation axis inside the roller.

[0019] Preferably, the member is mounted to be rotatable about the second rotation axis between the first member position and the second member position. A stopper is fixedly mounted on the roller, and when the member is in the second member position, the stopper contacts the ratchet element to reduce mechanical stress on the second rotation axis.

[0020] According to an embodiment, the ratchet element and the second rotation shaft define a functional gap in the form of a circular arc centered at least on the first rotation axis to reduce mechanical stress on the second rotation shaft.

[0021] In an advantageous development, the body comprises a first flange and a second flange, the first rotation axis being fixed to the first flange and the second flange, the roller being located between the first flange and the second flange. The clamp is fixedly mounted on the second flange.

[0022] Preferably, the detection device comprises:

[0023] - a pin protruding from the member in a direction parallel to the first axis of rotation;

[0024] A button fixed to the body and mounted to be movable between a first button position and a second button position, the button having a slider.

[0025] In the first button position, the slide is arranged to present no obstacle to the rotation of the pin about the first rotation axis.

[0026] In the second button position, when the roller rotates one revolution, the pin slides along the slider to move the member to at least a member position where the distance between the first rotation axis and the distal portion of the second contact area is greater than the distance between the first rotation axis and the proximal portion of the first contact area.

[0027] In a further advantageous development, in the second member position and in the second push-button position the pin is not in contact with the slide.

[0028] Preferably, the flyweight portion is arranged inside the roller.

[0029] Advantageously, the flyweight portion is fixedly mounted relative to the second contact surface.

[0030] Another object of the present invention is to provide a clamping device for a wire element, the clamping device comprising a detection device for the threshold speed of the clamping device according to any of the above configurations. The clamping device is more compact than the configuration of the prior art without impairing the efficiency of detecting the threshold rotation speed of the blocking roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other advantages and features will become more apparent from the following description of specific embodiments and implementations of the invention, which are given for non-limiting illustrative purposes only and are illustrated in the accompanying drawings, in which:

[0032] - Figure 1 A perspective view of a rope clamping device is schematically shown;

[0033] - Figure 2 A cross-sectional view of a rope clamping device is schematically shown;

[0034] - Figure 3 A perspective view schematically shows a speed detection device of a rope clamping device;

[0035] - Figure 4 A perspective view schematically shows a speed detection device of a rope clamping device, wherein the components are in a position enabling the roller to rotate;

[0036] - Figure 5 A perspective view schematically shows a speed detection device of a rope clamping device, wherein the member is in a position to enable the roller to rotate and the clamp is installed;

[0037] - Figure 6 A perspective view schematically shows a speed detection device of a rope clamping device, wherein the member is in a position to block the rotation of the roller and the clamp is installed;

[0038] - Figure 7 A perspective view schematically shows a speed detection device of a rope clamping device, wherein the member is in a position to block the rotation of the roller and no clamp is installed;

[0039] - Figure 8 schematically showing a cross-sectional perspective view of a speed detection device of a rope clamping device in a member position blocking the rotation of a roller on which the clamp is mounted, and a roller clamping button in a position enabling the rotation of the roller, showing a cutaway view of the plate, the first rotation axis and the clamping button;

[0040] - Fig. 9 A schematic top view of a speed detection device of a rope clamping device is shown, wherein the slider is in a position allowing the roller to rotate;

[0041] - Fig.10 A schematic top view of a speed detection device of a rope clamping device is shown, wherein the slide block is in a position designed to block the rotation of the roller;

[0042] - Fig.11 Schematically shows a top view of a speed detection device of a rope clamping device, wherein the slide is in a position designed to block the rotation of the roller and the pin sliding along the slide;

[0043] - Fig.12 Schematically shows a top view of a speed detection device of a rope clamping device, wherein the slide is in a position designed to block the rotation of the roller and the slide that pushes the member into the clamping position;

[0044] - Fig.13 A schematic top view of another embodiment of a speed detection device for a rope clamping device is shown, wherein the component is in a first component position;

[0045] - Fig.14 A further exemplary embodiment of a speed detection device for a cable clamping device is schematically shown in a top view, wherein the component is in the second component position. DETAILED DESCRIPTION

[0046] Figures 1 to 14 Different views of a line element clamp 1, preferably a rope clamp, are shown. The clamp 1 is preferably a fall arrester. The rope clamp comprises a roller 2 mounted to be rotatable in at least a first rotational direction about a first rotational axis 3. The first rotational axis 3 defines a first rotational axis of the roller 2. The clamp 1 defines a path designed for the passage of a rope. The path defines a channel, one wall of which is formed by the roller 2, so that sliding of the rope in the clamp causes the roller 2 to rotate.

[0047] The rope clamping device is configured to block rotation of the roller 2 in at least a first rotational direction when the rotational speed of the roller 2 about the first rotational axis reaches a threshold value. Preferably, the roller 2 is configured to rotate freely in both rotational directions at least when the rotational speed is below the threshold value.

[0048] The rope clamping device comprises a detection device configured to detect the rotation speed of the roller 2 in one rotation direction. The detection device is configured to allow the roller 2 to rotate when the rotation speed in the first rotation direction is below a threshold speed, and to prevent the roller 2 from rotating when the rotation speed of the roller 2 in the first rotation direction reaches the threshold speed. When the detection device detects that the rotation speed in the first rotation direction corresponds to the threshold speed, the roller 2 is jammed, which has the effect of blocking the rope if the rope is present in the rope clamping device.

[0049] The detection device includes a roller 2 and a first rotation shaft 3 defining a first rotation axis of the roller 2. The roller 2 is fixed to the first rotation shaft 3. The first rotation shaft 3 passes through the roller 2 or is pressed into the roller 2 so that the roller 2 rotates around the first rotation shaft 3. The first rotation shaft 3 is fixed to the body.

[0050] The detection device comprises at least one member 4 fixed to the roller 2. When the roller 2 rotates about the first rotation axis AA, the member 4 rotates about the first rotation axis. The member 4 is also mounted to be movable relative to the first rotation axis so as to be able to move towards or away from the first rotation axis AA. Preferably, the detection device comprises one, two, three or four members 4. Advantageously, the members 4 work independently of each other. In the illustrated embodiment, a single member 4 is used.

[0051] The detection device comprises a fixture 5. The fixture 5 is fixedly mounted to the body. The fixture 5 has a first contact surface 5a, and at least one member 4 has a second contact surface 4a, which is designed to contact the first contact surface 5a to block the rotation of the roller 2. Each member 4 is mounted to be movable so that the first contact surface 5a moves toward or away from the second contact surface 4a. The member 4 moves in a plane perpendicular to the first rotation axis AA. The same plane perpendicular to the first rotation axis AA passes through the first contact surface 5a and the second contact surface 4a.

[0052] The center of gravity of the component 4 is offset from the first rotation axis AA, so that the rotation of the roller 2 around the first rotation axis AA causes the component 4 to rotate around the first rotation axis AA and generates a centrifugal force which tends to move the second contact surface 4a away from the first rotation axis. The greater the rotation speed of the roller 2 around the first rotation axis AA, the greater the rotation speed of at least one component 4, and the further the second contact surface 4a moves away from the first rotation axis AA, so that the second contact surface 4a moves toward the first contact surface 5a.

[0053] At least one member 4 is mounted so as to be movable relative to a first axis of rotation AA between a first position and a second position.

[0054] The clamp 5 is configured to prevent the roller 2 from rotating in the first rotational direction about the first rotational axis when the first contact surface 5a is in contact with the second contact surface 4a. When the rotational speed of the roller 2 reaches a threshold value, a force is generated on the at least one member 4 so that the second contact surface 4a is in contact with the first contact surface 5a, which blocks the rotation of the at least one member 4 and thus blocks the rotation of the roller 2 at least in the first rotational direction. When the member 4 is in contact with the clamp 5, the clamp 5 blocks the roller 2 from rotating in the first rotational direction. When the member 4 is in the second member position, the member 4 is preferably in contact with the inner side wall of the roller 2. In an advantageous embodiment, the flyweight portion 4b and the ratchet element 4c are fixedly mounted to each other and advantageously form part of an integral member.

[0055] exist Figure 4 and 5In the first component position shown, the second contact surface 4a of the at least one component 4 is not in contact with the first clamping surface 5a of the clamp 5. In other words, the first distance between the first rotation axis AA and the distal portion of the second contact surface 4a is smaller than the second distance between the first rotation axis AA and the proximal portion of the first contact surface 5a. Figures 6 to 8 In the second component position shown, the second contact surface 4a of the at least one component 4 is in contact with the first clamping surface 5a of the clamp 5. In other words, the first distance is greater than the second distance.

[0056] The detection device defines an annular volume arranged between the first axis of rotation AA and the clamp 5. As long as the member 4 is within the annular volume, the member 4 can rotate. When the member 4 extends beyond the annular volume, the rotation of the member 4 will cause the first contact surface 4a to come into contact with the second contact surface 4a, which will cause the roller 2 to be clamped.

[0057] exist Figure 4 and 5 In the first member position shown, the rotation speed of the roller 2 is such that the clamp 5 does not hinder the rotation of the roller 2 in the first rotation direction. Figures 6 to 8 In the second member position shown, the rotational speed of the roller 2 has reached the threshold speed and the member 4 presses against the clamp 5 to prevent the roller 2 from rotating in the first rotational direction.

[0058] In order to obtain an effective clamping of the roller 2, it is important that the area of ​​the contact surface between the member 4 and the clamp 5 is greater than a value below which there is a risk of slippage, thereby preventing proper clamping. It is also important that below a threshold rotational speed, the roller 2 and the member 4 can rotate about the first rotation axis AA without the member 4 coming into contact with the clamp 5. It is therefore important that there is a considerable spacing between the member 4 and the clamp 5 when the member 4 and the clamp 5 are arranged radially facing each other and the roller 2 is at rest or at low speed.

[0059] Particularly advantageously, the second contact surface 4a of the member 4 is biased by a spring in the direction of the first rotation axis. The values ​​of the pitch and stiffness of the spring define the value of the centrifugal force causing the member 4 to move so that it presses on the clamp 5, thereby defining the threshold speed value.

[0060] Advantageously, the detection device has a spring configured to bias at least one member 4 so that the second contact surface 4a moves away from the first contact surface 5a. When the rotation speed of the roller 2 reaches a threshold value, the centrifugal force applied to the member 4 is large enough to resist the force generated by the spring, so that the first contact surface 5a can come into contact with the second contact surface 4a and clamp the roller 2. The spring resists the centrifugal force applied to the member 4, i.e. applies a force directed to the rotation axis AA. The spring is connected to the member 4 on the one hand and to the roller 2 on the other hand. The spring can also be connected to the member 4 and the first rotation axis 3. In the embodiments shown in the different figures, the spring is installed in a cavity formed in the member 4, and the spring is installed between the member 4 and the bottom of the roller 2.

[0061] In order to reduce the footprint of the detection device, the distance separating the member 4 and the first axis of rotation is reduced, which has the effect of reducing the centrifugal forces exerted on the member 4. This has the consequence that the threshold rotational speed causing the clamping of the roller 2 is less well defined. This also has the effect of reducing the volume of the member 4 and therefore its mass when the member 4 is moved towards the first axis of rotation AA. Moreover, this modification leads to a reduction in the centrifugal forces and therefore to a reduction in the sensitivity of the detection device with respect to the rotational speed of the roller 2. When the sensitivity of the detection system is reduced, the clamping of the roller 2 is performed over a speed range presenting a wider distribution around the threshold speed.

[0062] In order to increase the detection sensitivity of the detection device, it is necessary to increase the mass of the component 4 and / or the distance between the first rotation axis and the center of gravity of the component 4. These two criteria are not compatible with the reduction in size of the detection device.

[0063] In order to increase the detection sensitivity of the rotational speed of the roller 2, it is advantageous to increase the distance between the center of gravity of the member 4 and the first rotation axis AA. In order to obtain this result without increasing the footprint of the member, and therefore without increasing the size of the detection system, it is particularly advantageous to form the member 4 in a stepped shape, i.e. a member having a flyweight portion 4b and a ratchet element 4c located at two different heights relative to the first rotation axis AA of the roller.

[0064] The ratchet element 4c has a second contact surface 4a, and the flyweight portion 4b does not have a second contact surface 4a. The flyweight portion 4b is not designed to contact the clamp 5 to block the rotation of the roller 2. When viewed in a direction parallel to the first rotation axis AA, the flyweight portion 4b and the ratchet element 4c do not have the same shape. The flyweight portion 4b and the ratchet element 4c are arranged to follow each other in a direction parallel to the first rotation axis AA or substantially parallel to the first rotation axis AA.

[0065] In a radial direction extending from the first rotation axis AA, the distal end portion of the flyweight portion 4b is further away from the first rotation axis AA than the distal end portion of the second contact surface 4a, and more generally, further away from the first rotation axis AA than the distal end portion of the ratchet element 4c. The center of gravity of the flyweight portion 4b is further away from the first rotation axis than the center of gravity of the ratchet element 4c. This makes it possible to increase the centrifugal force compared to a member having a constant or substantially constant cross-section over the entire height of the member 4 (in the direction AA).

[0066] Preferably, the flyweight portion 4b has a portion facing the ratchet element 4c when viewed along the first rotation axis AA, and advantageously, the facing portion corresponds to at least 50%, preferably at least 75%, of the surface of the ratchet element 4c. Preferably, when viewed along the first rotation axis AA, the ratchet element 4c faces the flyweight portion 4b as a whole.

[0067] Preferably, the flyweight portion 4b has a surface that is at least 30% larger than the surface of the ratchet element 4c when viewed along the first rotation axis AA. Advantageously, the ratchet element 4c and the flyweight portion 4b are in the form of two circular arc rings. Preferably, the flyweight portion 4b extends beyond one of the two ends of the ratchet element 4c in an arc whose center corresponds to the first rotation axis AA. This enables the mass of the component to be increased without increasing the size of the ratchet element 4c. This configuration enables the center of gravity to be located further away compared to a component 4 comprising only a ratchet element 4c. Since the flyweight portion 4b belongs to a plane away from the first clamping surface 5a, it avoids the obligation regarding the spacing between the first clamping surface 5a and the second clamping surface 4a when the roller 2 has to rotate, or avoids the obligation regarding the minimum contact area between the ratchet element 4c and the clamp 5 when the roller 2 has to be clamped.

[0068] Compared to the configuration disclosed in document US 2014 / 0262611, in which the member has the same shape over the entire height of the member, the flyweight portion 4b enables the center of gravity to be located further away, thereby enabling the centrifugal force to be increased for a given threshold rotational speed.

[0069] The stepped configuration of the member 4 with the flyweight portion 4b offset relative to the ratchet element 4c enables an improved resulting centrifugal force / size trade-off.

[0070] When the member 4 is in the second position, designed to block the roller 2 , the flyweight portion 4 b is located at a distance from the first rotation axis AA that is greater than the distance separating the first rotation axis AA and the contact area between the member 4 and the clamp 5 .

[0071] Preferably, when the member 4 is in the second position and the ratchet element 4c is pressed against the clamp 5, the flyweight portion 4b advantageously extends beyond the ratchet element 4c by a distance equal to at least 10% of the radius between the first rotation axis AA and the distal portion of the contact area between the clamp 5 and the ratchet element 4c. Even more preferably, the flyweight portion 4b extends beyond the ratchet element 4c by a distance equal to at least 20%.

[0072] In order to improve compactness, it is particularly advantageous to use a hollow roller 2 and to position the member 4 inside the roller 2. A detection device that better detects the threshold speed can be formed without changing the diameter of the roller 2. The clamp 5 is at least partially located inside the roller 2, which enables a particularly compact detection device to be formed without impairing the detection sensitivity of the rotation speed of the roller 2. Advantageously, the flyweight portion 4b and / or the ratchet element 4c are located in the hollow interior of the roller 2.

[0073] When the clamp 5 is mounted in the inner volume of the hollow roller 2, the clamp 5 does not form an obstruction over the entire height of the inner volume of the roller 2. This height is a dimension parallel to the first rotation axis AA. The clamp 5 leaves space in the roller 2 so that the flyweight portion 4b can rotate above or below the clamp 5. In other words, in the first component position, the radial distance between the first rotation axis AA and the distal part of the flyweight portion 4b is greater than the radial distance between the first rotation axis AA and the proximal part of the first clamping area 5a. When the roller 2 rotates, the flyweight portion 4b can rotate around the first rotation axis AA and pass above or below the clamp 5 in a viewing direction parallel to the first rotation axis AA, as long as the threshold speed is not reached. Once the threshold speed has been reached, the ratchet element 4c presses on the clamp 5, which prevents the rotation of the flyweight portion 4b and the rotation of the roller 2 in the first rotation direction AA.

[0074] exist Figure 7 In the particular embodiment shown, when the first clamping area 5a is in contact with the second contact surface 4a, the flyweight portion 4b is in contact with the inner side wall 2a of the roller 2. When the flyweight portion 4b is in contact with the inner side wall 2a of the roller 2, advantageously, the ratchet element 4c is included in a circle having a radius equal to 2 / 3 of the radius defined by the inner side wall 2a of the roller 2 and the first axis of rotation.

[0075] Particularly advantageously, the flyweight portion 4b and the ratchet element 4c are fixedly mounted to one another.

[0076] In a particular embodiment, when the first clamping area 5a is not in contact with the second contact surface 4a, the distance between the first rotation axis AA and the distal portion of the flyweight portion 4b is greater than or equal to the distance between the first rotation axis AA and the proximal portion of the first clamping area 5a. This configuration can increase the centrifugal force effect without compromising the compactness of the detection device.

[0077] Preferably, in the first member position, the proximal portion of the ratchet element 4c abuts against the side wall of the roller 2, which defines a hole for the first rotation axis 3 to pass through. It is therefore advantageous that the distance between the distal portion of the ratchet element 4c and the first rotation axis AA is less than or equal to 2 / 3 of the radius between the first rotation axis AA and the distal portion of the flyweight portion 4b. This configuration enables an improvement in the ratio between the sensitivity of the speed detection and the compactness of the detection device.

[0078] The distal portion of the ratchet element 4c is the portion of the ratchet element 4c that is farthest from the first rotation axis. The distal portion of the flyweight portion 4b is the portion of the flyweight portion 4b that is farthest from the first rotation axis. On the other hand, the proximal portion is the portion that is closest to the first rotation axis AA. Preferably, the comparison of the distance between the distal portion of the ratchet element 4c and the flyweight portion 4b is performed for the same radius. The same is true for the comparison between the proximal portions or between the proximal and distal portions.

[0079] Particularly advantageously, the flyweight portion 4b extends radially beyond the distal end portion of the ratchet element 4c when viewed along the first rotation axis AA, and it also extends circumferentially, as shown in the different figures.Preferably, the flyweight portion 4b extends from both circumferential ends of the ratchet element 4c.

[0080] When viewed along the first rotational axis, it can be seen that the ratchet element 4c is located between the protruding portion of the flyweight portion 4b and the first rotational axis AA.

[0081] Preferably, the flyweight portion 4b represents at least 20% of the mass of the component 4. Even more preferably, the flyweight portion accounts for at least 33% of the mass of the component 4. The flyweight portion 4b and the ratchet element 4c are separated by a plane perpendicular to the first axis of rotation AA, which plane passes through the ends of the first contact area 5a and the second contact area 4a. The mass of the flyweight portion corresponds to the mass of the component located on the same side of the plane containing the flyweight portion, while the mass of the ratchet element 4c corresponds to the mass of the rest of the component 4 located on the other side of the plane.

[0082] exist Figures 9 to 13 In the preferred embodiment shown, in the second member position, i.e. the position designed to block the roller 2, the radius between the first rotation axis AA and the distal portion of the first contact area 5a is advantageously less than or equal to 75% of the radius between the first rotation axis and the distal portion of the flyweight portion 4b. Advantageously, when the roller 2 is hollow and receives the clamp 5 and the member 4, the radius between the first rotation axis and the first contact area 5a is less than or equal to 75% of the radius of the inner side wall 2a of the roller 2.

[0083] The use of a hollow roller 2 is particularly advantageous since it enables an improved compactness of the structure.Preferably, a plane perpendicular to the first axis of rotation AA passes through the ratchet element 4c, the clamp 5 and the groove 2b of the roller 2 for receiving the rope.

[0084] Improving the compactness of the detection device enables the diameter of the roller 2 to be reduced without compromising the sensitivity of detecting the rotational speed of the roller 2. By reducing the diameter of the roller 2, for a given linear rope speed in the clamping device, the rotational speed of the roller 2 is increased, thereby increasing the influence on the centrifugal force. In other words, decomposing the member 4 into a flyweight portion 4b and a ratchet element 4c, which are arranged successively in a direction parallel to the first rotation axis, makes it possible to reduce the diameter of the roller 2 without reducing the detection sensitivity, because for a given linear rope speed, the rotational speed of the roller 2 can be increased.

[0085] This configuration is particularly advantageous because Figures 1 to 14 As shown, the rotation speed detection device 1 of the roller 2 is completely or almost completely installed inside the roller 2.

[0086] exist Figures 1 to 3 In the embodiments shown in Figures 8 to 14, the roller 2 is arranged between a first plate 6 and a second plate 7 of the body. The first rotation axis 3 is fixed to the first plate 6 and the second plate 7. The roller 2 rotates around the first rotation axis 3 in the body, more precisely, between the fixed plates 6 and 7. The roller 2 is a blind component except for the hole for the passage of the first rotation axis 3. The member 4 is fixed to the roller 2 to follow the rotation of the roller 2 around the first rotation axis AA. Advantageously, the member 4 is mounted to be rotatable between a first position and a second position, preferably around the second rotation axis 8. Preferably, the second rotation axis 8 is fixed to the roller 2 so that the second rotation axis 8 rotates around the first rotation axis 3. The member 4 is fixed to the second rotation axis 8 so that the member 4 rotates around the first rotation axis 3 and around the second rotation axis 8.

[0087] Advantageously, in the second component position, the component 4 presses on a stop 9 of the roller 2 offset from the second rotation axis 8. The component 4 has a third contact area 4d, which, when the component is in the second component position, presses on a fourth contact area 9a formed by the stop 9, so that the mechanical stress on the second rotation axis 8 can be reduced. In the second component position, the stop 9 of the roller 2 exerts a force on the component 4, and the component 4 exerts a force on the clamp 5 to block the rotation of the roller 2 in the first rotation direction without exerting too much stress on the second rotation axis 8. The clamping of the stop 9 leads to the clamping of the roller 2. The stop 9 of the roller 2 is fixedly mounted relative to the roller 2. In order to clamp the roller 2, the ratchet element 4c presses on the stop 9 on the one hand and on the clamp 5 on the other hand. In the clamping position blocking the rotation of the roller 2, the ratchet element 4c is located between the stop 9 and the clamp 5. This configuration can reduce the force applied to the second rotation axis 8. Preferably, when the third contact area 4d and the fourth contact area are flat surfaces, they form a first plane including the first rotation axis, such as Figures 9 to 14 As shown. The extrusion direction is tangential, which limits the stress on the second axis of rotation. It is also possible to have a textured (eg serrated or sawtooth) contact area to reduce or prevent the occurrence of radially extending and compressing forces on the second axis of rotation 8.

[0088] When the stop 9 is used, advantageously, the member 4, more preferably the ratchet element 4c, and the second axis of rotation 8 define a functional clearance in a direction perpendicular to the axis AA, which represents the axis of rotation of the roller 2. Preferably, the functional clearance extends at least with a radius extending from the axis of rotation AA of the roller 2 and passing through the second axis of rotation 8. Advantageously, the arc is centered on the axis of rotation AA. The introduction of the functional clearance is particularly advantageous so that no mechanical stress is exerted on the second axis of rotation 8 when the member 4 presses on the clamp 5 on the one hand and on the stop 9 on the other hand.

[0089] like Fig.12 and 14 As shown, in order not to apply too much stress to the second rotation shaft 8, it is preferred that the member 4 is pressed against the outer peripheral side wall of the roller 2 in the second member position.

[0090] Also advantageously, in the second component position, the first contact area 5a and the second contact area 4a define a second plane parallel to the first rotation axis AA. The first plane is secant to the second plane, and the contact between the third contact area 4d and the fourth contact area 9a is separated by the intersection between the first rotation axis AA and the first plane and the second plane when viewed along the first rotation axis AA.

[0091] The use of the stop 9 is particularly advantageous in combination with a stepped component 4, but it is also possible to have a stop 9 which prevents the roller 2 from rotating together with the component according to one of the prior art configurations, in particular a configuration in which the cross section of the component 4 is constant or essentially constant over the entire height of the component.

[0092] exist Figures 1 to 12 In the embodiment shown, the third contact area 4d is mainly or solely formed by the ratchet element 4c. The third contact area 4d does not extend beyond the radius defined by the distal portion between the ratchet element 4c and the axis of rotation of the roller 2. Fig.13 and 14 In the embodiment shown, the third contact area 4d is formed in the ratchet element 4c and also in the flyweight portion 4b. Advantageously, the third contact area 4d is formed by the surface of the flyweight portion 4b and is preferably located at a greater distance than the contact area between the stopper and the ratchet element 4c.

[0093] Advantageously, when the component 4 is in the second component position, the second axis of rotation 8 is located at a radius from the first axis of rotation AA that is smaller than the radius of the second contact surface 4a.

[0094] Preferably, the first plate 6 and the second plate 7 of the body are fixed to each other by a third rotation axis 10 also fixed to the support 11. Figure 2 As shown, the third rotation axis 10 and the first rotation axis 3 are fixed to each other so as to form an integral assembly with the first plate 6 and the second plate 7. The integral assembly is mounted to be movable relative to the support 11 and to be rotatable around the third rotation axis 10. The first rotation axis 3 is mounted to be rotatable around the third rotation axis 10. The integral assembly is rotated relative to the support 11 to define an open position, allowing the rope to be inserted into the support 11 of the rope clamping device (here a fall arrester) or removed from the support 11. Preferably, the support 11 has a U-shaped area 12, which defines a loop designed to receive the rope. The loop is opened or closed by a movable integral assembly, in particular by a roller 2 that moves relative to the support 11.

[0095] Preferably, the integral assembly is biased by a second spring 13 so that by default, i.e. in the absence of external forces, the integral assembly is in a position to hold the rope in the fall arrester, more precisely in the U-shaped area 12. The spring biases the roller towards the U-shaped area with the aim of pressing the rope against the U-shaped area so that there is a strong contact between the rope and the roller 2 when the clamping device is moved relative to the rope.

[0096] Preferably, the roller 2 has a textured groove 2b, ie a groove that is not smooth. The groove 2b may be provided with spikes 2c or grooves in order to increase the friction between the roller 2 and the rope.

[0097] Advantageously, the second plate 7 defines the clamp 5 and is pressed into the hollow of the roller 2. The second plate 7 is able to block the rotation of the roller 2. The fixing of the second plate 7 to the first plate 6 by means of the first rotation axis 3 and the third rotation axis 10 enables a particularly effective clamp 5 to be formed. Figure 8 and 14 In the advantageous embodiment shown, the first plate 6 is fixed to the second plate 7 by means of rods 14 .

[0098] Particularly advantageously, a second plate 7 is provided to close the cavity defined in the roller 2. Preferably, the speed detection device is provided with a seal 15 of annular cross section, which connects the roller 2 and the second plate 7. Advantageously, the inner side wall 2a of the roller 2 has a groove 16 extending annularly. The seal 15 is inserted into the groove 16 so as to provide a tight seal. The seal 15 connecting the second plate 7 to the roller 2 forms a substantially tightly sealed space together with the blind roller 2, so that the life of the detection device is improved.

[0099] In a particular embodiment, the button 17 is fixed to the body, preferably to the second plate 7, and is movably mounted relative to the second plate 7. The button 17 is movable between a first button position and a second button position. The button 17 is mounted to be movable relative to the first rotation axis AA. In the first button position, the button 17 does not interact with the member 4 operating as described above. In the second button position, the button 17 clamps the roller 2 when the roller 2 rotates in the first rotation direction.

[0100] The member 4 is provided with a pin 18. Advantageously, the pin 18 does not face the second clamping area 4a in a plane perpendicular to the first rotation axis AA. The pin 18 can be mounted protruding from the ratchet element 4c or the flyweight portion 4b in a direction parallel to the first rotation axis AA. The pin 18 is preferably fixedly mounted on the member 4. When the roller 2 rotates around the first rotation axis 3, the pin 18 rotates around the first rotation axis 3. The pin 18 moves between a first pin position and a second pin position. The pin 18 rotates around the first rotation axis AA, and the distance from the first rotation axis AA is greater than or equal to a first value. The first value corresponds to the minimum distance between the first rotation axis AA and the pin 18 when the member 4 is in the first member position (for example, when the roller 2 is immovable). When the member 4 is in the second member position, the pin 18 is separated from the first rotation axis by a second value higher than the first value. The annular volume has a maximum radius corresponding to the second value.

[0101] The button 17 defines a slider 19. In a first button position, the slider 19 is arranged in such a way that it is not in contact with the pin 18 and does not form an obstacle to the rotation of the pin 18. The pin 18 rotates in a plane perpendicular to the first axis of rotation AA. In the first button position, the slider 19 is located outside the plane of rotation of the pin 18 and / or at a distance from the axis of rotation AA that is less than a first value or greater than a second value, for example greater than the radius of the roller 2. The slider 19 is arranged outside the position that the pin 18 can occupy when the roller rotates.

[0102] In the second button position, the slider 19 is arranged to form an obstacle to the movement of the pin 18. The slider 19 is located in the rotation plane of the pin 18, that is, in a plane perpendicular to the first rotation axis AA and passing through the pin 18. The slider 19 forms an obstacle extending from the first value to a third value higher than the first value. When the roller 2 rotates one circle, the pin 18 slides along the slider, moving the member 4 to the second member position. The third value can be the second value corresponding to the member 4 in the second member position. Alternatively, the third value corresponds to a position in which the member 4 is at a distance between the first rotation axis AA and the distal part of the second contact area 4a is greater than the distance between the first rotation axis AA and the proximal part of the first contact area 5a. In this configuration, the ratchet element 4c is far enough from the first rotation axis AA so that the ratchet element 4c contacts the clamp 5, thereby clamping the roller 2.

[0103] Advantageously, when the member 4 is in the second member position and the pushbutton is in the second pushbutton position, the slide 19 is not in contact with the pin 18 , thereby preventing the slide 19 and the pin 18 from absorbing the clamping force of the roller 2 .

[0104] When the roller 2 rotates in the first rotational direction and the button 17 is in the second button position, the pin 18 is in contact with the slider 19. The rotation of the roller in the first rotational direction causes the pin 18 to slide along the slider 19, and the sliding of the pin 18 along the slider 19 causes the ratchet element 4c to move away from the first rotational axis AA, i.e. towards a position corresponding to the second member position.

[0105] When the pin 18 is in the first pin position, the component 4 is in the first component position. When the pin 18 is in the second pin position, the component 4 is in the second component position. The pin 18 is fixedly mounted relative to the second contact area 4a.

[0106] Advantageously, the slider 19 moves only in a plane perpendicular to the first rotation axis AA when the button 17 moves between the first and second button positions. Preferably, the button 17 is mounted to be movable to move towards or away from the first rotation axis 3 between the first and second button positions.

[0107] The movement of the component 4 from the first position to the second position is independent of the rotational speed of the roller 2. The clamping of the roller 2 is performed at the latest when the roller 2 has completed a full revolution.

[0108] Such a button 17 is particularly advantageous because it is simple to manufacture and at the same time very effective. Although the button 17 and the pin 18 are shown in relation to the stepped member 4, another member configuration may also be used. Preferably, the pin 18 does not face the second contact area 4a in a plane perpendicular to the first rotation axis AA.

[0109] In the advantageous embodiment shown, when member 4 is mounted in the cavity defined by roller 2, button 17 passes through second plate 7 so that button 17 defines a slide 19 for pin 18, separated from the actuation area of ​​button 17 by second plate 7. Pin 18 slides along slide 19.

[0110] In the first button position (which corresponds to the first sliding position when the rotation speed of the roller 2 is low), the pin 18 rotates around the first rotation axis AA, and the pin 18 is not in contact with the slider 19. As the rotation speed of the roller 2 gradually increases until the threshold speed is reached, the pin 18 moves from the first position of the pin 18 to the second position of the pin 18, and the pin 18 is not in contact with the slider 19. When the rotation speed of the roller 2 reaches the threshold speed, the member 4 contacts the clamp 5, thereby blocking the roller 2, and the pin 18 is not in contact with the slider 19.

[0111] In the second button position, corresponding to the second sliding position, the slide 19 cuts off the track of the pin 18 when the roller 2 rotates in the first rotational direction. When the roller 2 rotates about the first rotational axis AA, the pin 18 rotates about the first rotational axis and slides along the slide 19, so that the pin 18 moves from the first pin position to the second pin position. Once the second pin position has been reached, the ratchet element 4c comes into contact with the clamp 5, thus completing the movement of the member 4 to the second member position. The rotation of the roller 2 means that the first clamping area 5a comes into contact with the second contact surface 4a, which has the effect of blocking the roller 2.

[0112] In the second button position, the button 17 defines a slider 19 that interrupts the trajectory of the pin 18, thereby deflecting the pin 18 so as to move the member 4 to the second member position, thereby achieving clamping of the roller 2 independently of the rotation speed of the roller 2. When the roller 2 rotates one revolution or less, the button 17 moves from the first member position to the second member position, so that the roller 2 can be blocked independently of the rotation speed of the roller 2.

[0113] This solution is particularly advantageous since the same member 4 is used to block the roller 2 when the rotation speed of the roller 2 reaches a threshold speed, or when the roller 2 makes one revolution when the button 17 is moved into the clamping position of the roller 2 .

[0114] In a particular embodiment, when the member 4 is pressed against the stop 9 of the roller 2 , the slide 19 is away from the pin 18 , so that the force exerted by the roller 2 on the clamp 5 is not transmitted to the slide 19 .

[0115] It is advantageous for the button 17 to be rotatably mounted in order to move the slide 19 .

[0116] Figures 1 to 14 The configuration shown is advantageous because it has a reduced number of components, thereby reducing the risk of failure rates.

[0117] The rotation speed detection device of the roller 2 advantageously forms part of the fall arrester. The fall arrester may comprise a rope mounted in a support and in contact with the roller 2. The fall arrester is configured to prevent the fall arrester from running along the rope at a linear speed higher than a threshold speed. When the rope is in contact with the roller 2, the running speed between the rope and the fall arrester corresponds to the rotation speed of the roller 2. The line element runs in the clamping device, thereby rotating the roller 2. When the rotation speed of the roller 2 reaches the threshold rotation speed, the roller 2 is jammed.

[0118] In the illustrated embodiment, the roller 2 is configured to operate with a rope of circular cross section, but rollers 2 designed to operate with a belt having a square or rectangular cross section may also be provided. The detection device is particularly suitable for use in clamping devices for line elements, in particular ropes, but may also be used in automatic winding machines.

Claims

1. A device for detecting a threshold speed of a clamping device, configured to detect the rotation speed of a roller (2) of a clamping device (1) for a line element, comprising: -main body; - a first rotation axis (3) fixed to the body; - a roller (2) mounted to rotate about a first rotation axis (3), the first rotation axis (3) defining a first rotation axis (AA) for the roller (2); - a clamp (5) fixed to the body and having a first contact surface (5a); - at least one member (4) fixed to the roller (2) so as to rotate about the first rotation axis (AA) in an annular volume arranged between the first rotation axis (AA) and the clamp (5), the at least one member (4) having a second contact surface (4a), the at least one member (4) being mounted so as to be movable relative to the first rotation axis (AA) between a first member position and a second member position, the first member position a first distance between the first rotation axis (AA) and a distal portion of the second contact surface (4a) being smaller than a second distance between the first rotation axis (AA) and a proximal portion of the first contact surface (5a), the second member position the first distance being greater than the second distance, the rotation of the roller (2) generating a centrifugal force designed to move the second contact surface (4a) away from the first rotation axis (AA) to increase the value of the first distance, so that when the rotation speed of the roller (2) exceeds a threshold rotation speed, the second contact surface (4a) contacts the first contact surface (5a), the clamp (5) blocks the rotation of the roller (2) in one direction when the first contact surface (5a) contacts the second contact surface (4a); It is characterized in that The member (4) has a flyweight portion (4b) and a ratchet element (4c) arranged successively in a direction parallel to the first rotation axis (AA), the ratchet element (4c) comprising a second contact surface (4a); In the second member position, the flyweight portion (4b) is not in contact with the clamp (5); and When viewed along the first rotation axis (AA), a distal end portion of the flyweight portion (4b) is further away from the first rotation axis (AA) than a distal end portion of the second contact surface (4a).

2. The device for detecting the threshold speed of the clamping device according to claim 1, characterized in that: In the first member position, a radial distance between the first rotation axis (AA) and a distal portion of the flyweight portion (4b) is greater than a radial distance between the first rotation axis (AA) and a proximal portion of the first contact surface (5a).

3. The device for detecting the threshold speed of the clamping device according to claim 1, characterized in that: The roller (2) is hollow, and the clamp (5) is arranged inside the roller (2).

4. The device for detecting the threshold speed of the clamping device according to claim 3, characterized in that: The member (4) is mounted so as to be rotatable between the first member position and the second member position about a second rotation axis (8), the second rotation axis (8) being fixed to the roller (2) and mounted so as to be rotatable inside the roller (2) about the first rotation axis (3).

5. The device for detecting the threshold speed of the clamping device according to claim 3, characterized in that: The flyweight portion (4b) is arranged inside the roller (2).

6. The device for detecting the threshold speed of the clamping device according to claim 1, characterized in that: The member (4) is mounted to be rotatable about a second rotation axis (8) between the first member position and the second member position, and a stopper (9) is fixedly mounted on the roller (2). When the member (4) is in the second member position, the stopper (9) contacts the ratchet element (4c) to reduce mechanical stress on the second rotation axis (8).

7. The device for detecting the threshold speed of the clamping device according to claim 6, characterized in that: The ratchet element (4c) and the second rotation shaft (8) define a functional gap in the form of a circular arc at least centered on the first rotation axis (AA) to reduce mechanical stress on the second rotation shaft (8).

8. The device for detecting the threshold speed of the clamping device according to claim 1, characterized in that: The main body comprises a first flange (6) and a second flange (7), the first rotating shaft (3) is fixed to the first flange (6) and the second flange (7), the roller (2) is located between the first flange (6) and the second flange (7), and the clamp (5) is fixedly mounted on the second flange (7).

9. The device for detecting the threshold speed of the clamping device according to claim 1, characterized in that: The detection device comprises: - a pin (18) which projects from said member (4) in a direction parallel to said first axis of rotation (AA); - a button (17) fixed to the body and mounted to be movable between a first button position and a second button position, the button (17) having a slider (19); In the first button position, the slider (19) is arranged so as not to constitute an obstacle to the rotation of the pin (18) about the first rotation axis (AA); and In the second button position, when the roller (2) rotates one circle, the pin (18) slides along the slider (19), moving the component (4) at least to a component position in which the distance between the first rotation axis (AA) and the distal portion of the second contact surface (4a) is greater than the distance between the first rotation axis (AA) and the proximal portion of the first contact surface (5a).

10. The device for detecting the threshold speed of the clamping device according to claim 9, characterized in that: In the second member position and in the second button position, the pin (18) is not in contact with the slider (19).

11. The device for detecting a threshold speed of a clamping device according to claim 1, characterized in that: The flyweight portion (4b) is fixedly mounted relative to the second contact surface (4a).

12. A clamping device for a wire element, comprising a detection device for a threshold speed of the clamping device according to claim 1 or 2.

Images