Test device
By designing a test device with a base, positioning mechanism, and human hand simulation mechanism, the problem of large error in door handle durability testing in existing technologies has been solved, enabling accurate testing of door handle opening and closing durability and improving the authenticity and accuracy of the test.
Patent Information
- Application Number
- CN202520043996.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-01-08
AI Technical Summary
Existing durability testing equipment cannot accurately test the opening and closing durability of door handles, resulting in significant testing errors.
A test device was designed, including a base, a positioning mechanism, a human hand simulation mechanism, and an unlocking mechanism. By simulating the real working condition of a human hand pressing a door handle, and using detachable simulated fingers and transmission components, the device accurately simulates the size and thickness of different fingers. Combined with a support platform and a reset structure, the device enables the durability test of the door handle.
It improves the accuracy of door handle durability testing, can simulate the fingers of people of different ages and genders, and enhances the authenticity and accuracy of test results.
Smart Images

Figure CN223692011U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of vehicle testing, and in particular, to a test device. BACKGROUND
[0002] A door handle is usually provided on a vehicle, and the opening and closing durability of the door handle is an important reference index for the performance of the door handle. At present, a durability test device is usually used to test the opening and closing durability of the door handle. However, the existing durability test device has a large test error and cannot accurately test the opening and closing durability of the door handle. SUMMARY
[0003] The present disclosure provides a test device, which can improve the accuracy of durability test of a door handle.
[0004] According to an aspect of the present disclosure, a test device is provided for a door handle, the door handle comprising a handle seat, a handle body and a handle cover, the handle body being located between the handle seat and the handle cover, and the handle body being provided with a pressing unlocking portion; the pressing unlocking portion is movable between an unlocking position and a locking position; the test device comprises:
[0005] a base;
[0006] a positioning mechanism arranged on the base, and the door handle is fixed to the positioning mechanism;
[0007] a hand simulation mechanism comprising a mounting seat and a plurality of simulation fingers, the mounting seat having a first end and a second end, and the plurality of simulation fingers being detachably mounted to the first end;
[0008] an unlocking mechanism arranged on the base, the unlocking mechanism comprising a transmission assembly and a first driving member, the transmission assembly being connected to the second end, and the first driving member being configured to drive the transmission assembly to press the simulation fingers against the pressing unlocking portion, so that the pressing unlocking portion moves from the locking position to the unlocking position.
[0009] In an exemplary embodiment of the present disclosure, the mounting seat has an arc between the first end and the second end.
[0010] In an exemplary embodiment of the present disclosure, the transmission assembly comprises:
[0011] a first support seat arranged on the base;
[0012] an oscillating arm comprising a first oscillating portion, a second oscillating portion and a connecting portion connecting the first oscillating portion and the second oscillating portion, the first oscillating portion being connected to the second end, the connecting portion being rotatably connected to the base, and the first driving member being configured to drive the second oscillating portion to rotate the oscillating arm.
[0013] In an example embodiment of the present disclosure, the first swing portion and the second swing portion have an included angle therebetween, the included angle being greater than 0° and less than 180°.
[0014] In an example embodiment of the present disclosure, the unlocking mechanism further comprises a second support base arranged on the base;
[0015] a first mounting portion mounted on the second support base;
[0016] a first driving portion for driving the second swing portion.
[0017] In an example embodiment of the present disclosure, the unlocking mechanism further comprises:
[0018] a first force detector arranged between the first driving portion and the second swing portion, for detecting a force applied by the first driving portion to the second swing portion.
[0019] In an example embodiment of the present disclosure, the test device further comprises:
[0020] a support platform slidingly arranged on the base and capable of reciprocating sliding along a first direction, the unlocking mechanism being arranged on the support platform;
[0021] a second driving member connected with the support platform, for driving the support platform to slide along the first direction;
[0022] wherein the first direction is a direction in which the handle body points to the handle cover.
[0023] In an example embodiment of the present disclosure, the test device further comprises:
[0024] a reset structure connected with the support platform, for driving the support platform to reset after the second driving member drives the support platform to slide along the first direction.
[0025] In an example embodiment of the present disclosure, the test device further comprises:
[0026] a slide rail arranged on the base and extending along the first direction, the support platform being slidingly mounted on the slide rail and capable of reciprocating sliding along the slide rail.
[0027] In an exemplary embodiment of the present disclosure, the base station comprises a support frame and a bearing platform, the support frame supports the bearing platform, and the slide rail is arranged on the bearing platform; the second driving member comprises a second mounting portion and a second driving portion; the reset structure is an elastic traction rope, one end of the elastic traction rope is connected with the support platform, and the other end is connected with the second driving portion; and the test device further comprises:
[0028] a third support seat arranged on the side surface of the support frame, and the second mounting portion is mounted on the third support seat;
[0029] a pulley arranged on the edge region of the bearing platform close to the second driving member in the first direction, and the elastic traction rope can slide on the pulley to change the movement direction of the elastic traction rope.
[0030] The test device of the present disclosure can accurately simulate the real working condition of the human hand when pressing the unlocking part of the door handle. Therefore, the test device can accurately test the opening and closing durability of the door handle by repeatedly driving the simulated fingers to press the unlocking part of the door handle.
[0031] In addition, in the test device of the present disclosure, the simulated fingers can be detachably mounted on the mounting seat, so that fingers of different sizes and thicknesses can be arbitrarily replaced according to needs, so as to accurately simulate different fingers of the human hand. At the same time, fingers of different ages and different genders can also be accurately simulated, further improving the authenticity of simulation and further improving the accuracy of test results.
[0032] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS
[0033] The drawings incorporated into the specification and forming a part thereof, show embodiments consistent with the present disclosure, and together with the specification, serve to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.
[0034] Figure 1 It is an embodiment of the structure of the test device of the present disclosure.
[0035] Figure 2 It is an embodiment of the structure of the human hand simulation mechanism of the present disclosure.
[0036] Explanation of reference signs:
[0037] 1. Door handle; 10. Handle base; 11. Handle body; 12. Handle cover; 13. Press-to-unlock mechanism;
[0038] 2. Base; 20. Bearing platform; 21. Support frame;
[0039] 3. Positioning mechanism; 30. First clamping plate; 31. Second clamping plate; 32. Placement platform;
[0040] 4. Hand simulation mechanism; 40. Mounting base; 41. Simulated finger; 411. Finger base; 412. Fingerprint patch; 42. Connector;
[0041] 5. Unlocking mechanism; 50. Transmission assembly; 501. First support base; 502. Swing arm; 5021. First swing part; 5022. Second swing part; 5023. Connecting part; 51. First driving component; 511. First mounting part; 512. First driving part; 52. Second support base; 53. Stop block; 54. First force detector;
[0042] 6. Support platform; 7. Second drive unit; 71. Second mounting part; 72. Second drive unit; 8. Reset structure; 9. Slide rail; 14. Elastic traction rope; 15. Third support seat; 16. Pulley; 17. Pull ring; 18. Door; 19. Second force detector;
[0043] X, the first direction. Detailed Implementation
[0044] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.
[0045] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first” and “second” are used only as markers and are not a limitation on the number of objects.
[0046] like Figure 1 and Figure 2 As shown, this disclosure provides a testing apparatus that can be used for a door handle 1 to test the opening and closing durability of the door handle 1.
[0047] The door handle 1 may include a handle base 10, a handle body 11, and a handle cover 12. The handle base 10 can be connected to a vehicle door 18 to mount the door handle 1 onto the door 18. The handle body 11 may be located between the handle base 10 and the handle cover 12. The handle body 11 may be provided with a press-to-unlock part 13, which can move between an unlocked position and a locked position. When the press-to-unlock part 13 is in the unlocked position, the door handle 1 is in the open state, and the vehicle door 18 can be opened. When the press-to-unlock part is in the locked position, the door handle 1 is in the closed state, and the vehicle door 18 is locked and cannot be opened. For example, when the press-to-unlock part 13 is pressed, it can move to the unlocked position, at which point the door handle 1 is in the open state. When the press-to-unlock part 13 is released, it can move to the locked position, at which point the door handle 1 is in the closed state. The handle cover 12 can cover the handle body 11 to protect it from damage caused by rainwater erosion.
[0048] In one embodiment, the press-to-unlock part 13 may be a partial structure provided on the handle body 11, but it is not limited thereto. The entire handle body 11 may also be the press-to-unlock part 13, that is, the entire handle body 11 can move between the unlock position and the locked position.
[0049] like Figure 1 and Figure 2 As shown, the experimental apparatus of this embodiment may include: a base 2, a positioning mechanism 3, a hand simulation mechanism 4, and an unlocking structure. The positioning mechanism 3 may be disposed on the base 2, and the door handle 1 may be fixed to the positioning mechanism 3. The hand simulation mechanism 4 may include a mounting base 40 and a plurality of simulated fingers 41. The mounting base 40 may have a first end and a second end, and the plurality of simulated fingers 41 may be detachably mounted on the first end. The unlocking mechanism 5 may be disposed on the base 2, and the unlocking mechanism 5 may include a transmission assembly 50 and a first driving member 51. The transmission assembly 50 may be connected to the second end, and the first driving member 51 may be used to drive the transmission assembly 50, so that the simulated fingers 41 press the unlocking part 13, causing the unlocking part 13 to move from the locked position to the unlocked position.
[0050] Therefore, by setting up the hand simulation mechanism 4, the actual working conditions of a human hand pressing to unlock the door handle 1 can be accurately simulated. Thus, by repeatedly driving the simulated finger 41 to press the unlocking part 13 on the door handle 1, the testing device can accurately test the opening and closing durability of the door handle 1. Furthermore, since the simulated finger 41 is detachably mounted on the mounting base 40, fingers of different sizes and thicknesses can be arbitrarily replaced as needed to accurately simulate different fingers of the human hand. Simultaneously, it can accurately simulate the fingers of people of different ages and genders, further improving the realism of the simulation and the accuracy of the test results.
[0051] The mounting base 40 may have a curved section between the first and second ends to more accurately simulate the shape of a human hand pressing to unlock, thereby further improving the realism of the test device simulating the working condition of a human hand pressing to unlock the door handle 1, and further improving the accuracy of the test results.
[0052] The simulated finger 41 may include a finger base 411 and a fingerprint patch 412. The finger base 411 is detachably mounted on the first end of the mounting base 40, and the fingerprint patch 412 can be attached to the surface of the finger base 411. When it is necessary to change the spacing between two adjacent simulated fingers 41, the position of the fingerprint patch 412 can be adjusted to change the spacing between two adjacent fingerprint patches 412, thereby changing the spacing between two adjacent simulated fingers 41.
[0053] Furthermore, when it is necessary to change the size of the simulated finger 41, it is not necessary to replace the simulated finger 41. For example, the size of the simulated finger 41 can also be changed by replacing it with a fingerprint patch 412 of a different size, and / or by cutting the finger base 411. Similarly, when it is necessary to change the thickness of the simulated finger 41, it is not necessary to replace the simulated finger 41. For example, the thickness of the simulated finger 41 can also be changed by replacing it with a fingerprint patch 412 of a different thickness.
[0054] The hand simulation mechanism 4 may also include a connector 42, which may be located at the second end of the mounting base 40 for connecting the transmission assembly 50 and the mounting base 40.
[0055] The transmission assembly 50 may include a first support base 501 and a swing arm 502. The first support base 501 may be disposed on the base 2 to provide support for other structures of the transmission assembly 50. The swing arm 502 may include a first swing portion 5021, a second swing portion 5022, and a connecting portion 5023 connecting the first swing portion 5021 and the second swing portion 5022. The first swing portion 5021 may be connected to the second end of the mounting base 40. When the human hand simulation mechanism 4 includes a connector 42, the first swing portion 5021 may be connected to the connector 42. The connecting portion 5023 is rotatably connected to the base 2, and the first drive member 51 can drive the second swing portion 5022 to rotate the swing arm 502. When the swing arm 502 rotates, the first swing portion 5021 can push the human hand simulation mechanism 4 to make the simulated finger 41 press the pressing unlock portion 13, causing the pressing unlock portion 13 to move from the locked position to the unlocked position.
[0056] The first swing part 5021 and the second swing part 5022 can have an included angle, which can be greater than 0° and less than 180°, for example, 45°, 90°, 135°, 150°, 170°, 179°, etc. The first swing part 5021 and the second swing part 5022 can provide a larger rotation space, so as to increase the movement range of the human hand simulation mechanism 4.
[0057] The first swing part 5021 and the second swing part 5022 can be swing rods, but are not limited thereto. The first swing part 5021 and the second swing part 5022 can also be swing plates, and the present disclosure does not limit this.
[0058] In some embodiments of the present disclosure, the unlocking structure can further include a second support seat 52. The second support seat 52 can be arranged on the base 2, and the first driving member 51 can be mounted on the second support seat 52 to ensure the stability of the first driving member 51 during driving.
[0059] The first driving member 51 can include a first mounting part 511 and a first driving part 512. The first mounting part 511 can be mounted on the second support seat 52. The second support seat 52 can be provided with a first mounting hole, and the first mounting part 511 can be fixed on the first mounting hole by a connecting member 42 such as a bolt, so as to realize the mounting of the first driving member 51. The first mounting hole can be provided with a plurality of first mounting holes, and the first mounting part 511 can be fixed on different first mounting holes to adjust the position of the first driving member 51, thereby improving the application range of the test device. The first driving part 512 can be used to drive the second swing part 5022, for example, the first driving part 512 can move towards the second swing part 5022 relative to the first mounting part 511 to drive the second swing part 5022 to move.
[0060] The first driving member 51 can be an electric motor to accurately control the driving speed and displacement. However, it is not limited thereto. The first driving member 51 can also be a hydraulic cylinder, a pneumatic cylinder, etc., and the present disclosure does not limit this.
[0061] The unlocking mechanism 5 can further include a first force detector 54 arranged between the first driving part 512 and the second swing part 5022, which is used to detect the force applied by the first driving part 512 to the second swing part 5022. The first force detector 54 can be a force sensor, but is not limited thereto.
[0062] In one embodiment, the unlocking mechanism 5 can further include a stop block 53 arranged on the side of the second support seat 52 away from the positioning mechanism 3, which is used to stop and position the second support seat 52 to avoid displacement of the second support seat 52 during driving of the first driving member 51, so as to ensure the test stability of the test device.
[0063] In some embodiments of the present disclosure, the test device can further comprise a support platform 6 and a second driving member 7. The support platform 6 can be slidably arranged on the base 2 and can reciprocate along a first direction X, which can be a direction in which the handle body 11 points to the handle cover 12. The unlocking mechanism 5 can be arranged on the support platform 6. The second driving member 7 can be connected with the support platform 6 and used to drive the support platform 6 to slide along the first direction X. In this way, the working condition of the human hand rubbing to open the vehicle door 18 after the vehicle door 18 is unlocked can be simulated, so that the working condition of the human hand opening and closing the vehicle door 18 can be increased in cooperation with the unlocking mechanism, and the test accuracy of the test device can be further improved.
[0064] The second driving member 7 can comprise a second mounting portion 71 and a second driving portion 72. The second mounting portion 71 can be mounted on the base 2, and the second driving portion 72 can be connected with the support platform 6 and used to drive the support platform 6 to slide along the first direction X. The second driving member 7 can be an electric motor to accurately control the driving speed and displacement. However, the second driving member 7 can also be a hydraulic cylinder, a pneumatic cylinder, etc., and the present disclosure does not limit this.
[0065] The test device can further comprise a slide rail 9. The slide rail 9 can be arranged on the base 2 and can extend along the first direction X. The support platform 6 can be slidably mounted on the slide rail 9, and the support platform 6 can reciprocate along the slide rail 9. In this way, the sliding smoothness of the support platform 6 can be improved, and thus the accuracy of the test result can be improved.
[0066] The test device can further comprise a reset structure 8. The reset structure 8 can be connected with the support platform 6 and used to drive the support platform 6 to reset after the support platform 6 is driven by the second driving member 7 to slide along the first direction X, so as to simulate the working condition of the human hand rubbing to open the vehicle door 18 after the vehicle door 18 is unlocked. Meanwhile, in the process of resetting the support platform 6, the working condition of the human hand rubbing to close the vehicle door 18 after the vehicle door 18 is unlocked can be simulated, so that the working condition of the human hand opening and closing the vehicle door 18 can be further increased, and the test accuracy of the test device can be further improved.
[0067] In some embodiments, the reset structure 8 can be an elastic traction rope 14, one end of the elastic traction rope 14 being connected with the support platform 6 and the other end being connected with the second driving portion 72. When it is needed to drive the support platform 6 to slide along the first direction X, the second driving portion 72 can pull the elastic traction rope 14 to pull the support platform 6 to slide along the first direction X. When the second driving portion 72 pulls the elastic traction rope 14, the elastic traction rope 14 will be elastically deformed, and a restoring force will be generated inside the elastic traction rope 14. When the second driving portion 72 releases the elastic traction rope 14, the restoring force of the elastic traction rope 14 will drive the support platform 6 to reset.
[0068] But not limited to, the reset structure 8 can also be a reset spring, one end of the reset spring can be connected to the base 2, the other end can be connected to the support platform 6. When the second driving part 72 pulls the support platform 6, the reset spring will be elastically deformed, and the restoring force will be generated inside the reset spring. When the second driving part 72 releases the support platform 6, the restoring force of the reset spring will drive the support platform 6 to reset. The reset structure 8 can also be other reset parts, such as reset motor, reset hydraulic cylinder, etc.
[0069] In some embodiments, the base 2 can include: a bearing platform 20 and a support frame 21. The positioning structure and the unlocking structure can be arranged on the bearing platform 20. Further, the slide rail 9 can be arranged on the bearing platform 20, the support platform 6 can be arranged on the slide rail 9, and the positioning structure and the unlocking structure can be arranged on the support platform 6. The support frame 21 can support the bearing platform 20 to improve the bearing capacity of the bearing platform 20.
[0070] The test device can further include: a third support seat 15. The third support seat 15 can be arranged on the side of the support frame 21, and the second mounting part 71 can be mounted on the third support seat 15 to fix the second driving part 7 on the base 2. The third support seat 15 can be provided with a second mounting hole, and the second mounting part 71 can be fixed on the second mounting hole through the connecting piece 42 such as a bolt to realize the installation of the second driving part 7. The second mounting hole can be provided with a plurality of second mounting holes, and the second mounting part 71 can be fixed on different second mounting holes to adjust the position of the second driving part 7, thereby improving the application range of the test device.
[0071] The test device can further include: a pulley 16. The pulley 16 can be arranged on the edge area of the bearing platform 20 close to the second driving part 7 in the first direction X, and the elastic traction rope 14 can slide on the pulley 16 to change the movement direction of the elastic traction rope 14.
[0072] The test device can further include: a pull ring 17. The pull ring 17 can be fixed on the support platform 6 to facilitate the connection between the support platform 6 and the second driving part 72.
[0073] The test device can further include: a second force detector 19, which can be arranged between the support platform 6 and the second driving part 72, for example: the second force detector 19 can be arranged between the elastic traction rope 14 and the second driving part 72, or between the elastic traction rope 14 and the support platform 6, for detecting the force applied by the second driving part 72 to the support platform 6. The second force detector 19 can be a force sensor, but not limited to this.
[0074] In some embodiments of the present disclosure, the positioning mechanism 3 can comprise a first clamping plate 30 and a second clamping plate 31. The first clamping plate 30 and the second clamping plate 31 can be oppositely arranged, and the door handle 1 can be located between the first clamping plate 30 and the second clamping plate 31, so as to fix and position the door handle 1 by the first clamping plate 30 and the second clamping plate 31.
[0075] Further, the positioning mechanism 3 can further comprise a placement table 32. The placement table 32 can be located between the first clamping plate 30 and the second clamping plate 31, and the first clamping plate 30 and the second clamping plate 31 can fix and position the placement table 32. A part of the door 18 can be placed on the placement table 32, and the door handle 1 can be installed on the part of the door 18. Thus, the fixing and positioning of the door 18 and the door handle 1 can be realized by fixing and positioning the placement table 32 by the first clamping plate 30 and the second clamping plate 31. Moreover, the present disclosure can introduce the structure of the door 18 in the process of the test by arranging the placement table 32, so as to more accurately simulate the working condition of opening and closing the door 18 by the door handle 1 by the human hand, and further improve the accuracy of the test results.
[0076] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.
Claims
1. A test device, characterized in that A test device for a door handle, the door handle comprising a handle base, a handle body and a handle cover, the handle body being located between the handle base and the handle cover, the handle body being provided with a pressing unlocking portion; the pressing unlocking portion being movable between an unlocking position and a locking position; the test device comprising: a base; a positioning mechanism provided on the base, the door handle being fixed to the positioning mechanism; a hand simulation mechanism comprising a mounting seat and a plurality of simulation fingers, the mounting seat having a first end and a second end, the plurality of simulation fingers being detachably mounted to the first end; an unlocking mechanism provided on the base, the unlocking mechanism comprising a transmission assembly and a first driving member, the transmission assembly being connected to the second end, the first driving member being used to drive the transmission assembly to enable the simulation fingers to press the pressing unlocking portion, so that the pressing unlocking portion is moved from the locking position to the unlocking position.
2. The test device of claim 1, wherein, The portion of the mounting seat between the first end and the second end has a curvature.
3. The test device of claim 1, wherein, The transmission assembly comprises: a first support seat provided on the base; a swing arm comprising a first swing portion, a second swing portion and a connecting portion connecting the first swing portion and the second swing portion, the first swing portion being connected to the second end, the connecting portion being rotationally connected to the base, the first driving member being capable of driving the second swing portion to rotate the swing arm.
4. The test device of claim 3, wherein The first swing portion and the second swing portion have an included angle, the included angle being greater than 0° and less than 180°.
5. The test device of claim 4, wherein, The unlocking mechanism further comprises a second support seat provided on the base; the first driving member comprises: a first mounting portion mounted to the second support seat; a first driving portion used to drive the second swing portion.
6. The test device of claim 5, wherein The unlocking mechanism further comprises: a first force detector provided between the first driving portion and the second swing portion, used to detect the force applied by the first driving portion to the second swing portion.
7. The test device according to any one of claims 1 to 6, characterized in that The test device further comprises: a support platform slidingly provided on the base and capable of reciprocating sliding in a first direction, the unlocking mechanism being provided on the support platform; a second driving member connected to the support platform, used to drive the support platform to slide in the first direction; wherein the first direction is a direction in which the handle body points to the handle cover.
8. The test device of claim 7, wherein, The test device further comprises: a reset structure connected to the support platform, used to drive the support platform to reset after the second driving member drives the support platform to slide in the first direction.
9. The test device of claim 8, wherein, The test device further comprises: a slide rail provided on the base and extending in the first direction, the support platform being slidingly mounted on the slide rail and capable of reciprocating sliding along the slide rail.
10. The test device of claim 9, wherein, The base comprises a support frame and a bearing platform, the support frame supporting the bearing platform, the slide rail being provided on the bearing platform; the second driving member comprises a second mounting portion and a second driving portion; the reset structure is an elastic traction rope, one end of the elastic traction rope being connected to the support platform and the other end being connected to the second driving portion; the test device further comprises: a third support seat provided on a side surface of the support frame, the second mounting portion being mounted on the third support seat; A pulley is arranged at an edge region of the carrying platform close to the second drive element in the first direction, the elastic traction cable being able to slide on the pulley in order to change the direction of movement of the elastic traction cable.