Vehicle side ladder device with double lock structure

Abstract

The utility model provides a kind of vehicle side cat ladder device of double lock structure, including first ladder stand, the first ladder stand includes first ladder stand main body and double lock structure, one end of the first ladder stand main body is locking end, the locking end is connected with the double lock structure, another end of the first ladder stand assembly is first connecting end;And second ladder stand, one end of the second ladder stand is second connecting end, the second connecting end with the first connecting end swing joint, another end of second ladder stand is lockable free end, the second ladder stand includes second ladder stand main body and double card plate structure, the double card plate structure is connected in the lockable free end, and be located in the second ladder stand main body both sides, the double card plate structure with the double lock structure lockable connection, make the first ladder stand with the second ladder stand fixed and separate.

Description

Technical Field

[0001] This utility model relates to the field of vehicles, and in particular to a vehicle side ladder device with a double-lock structure. Background Technology

[0002] With the increasing popularity of off-road camping and self-driving tours, vehicle space has been extended to rooftop platforms, making vehicle-mounted side ladders widely used as a convenient tool for users to access the roof. Currently, vehicle-mounted side ladders typically employ a folding structure, dividing the ladder into a main ladder frame and a secondary ladder frame. The fixed ends of the main and secondary ladder frames are connected by hinges to allow them to flip down, extending the ladder length. After use, the secondary ladder frame is folded up and secured. In existing technologies, the locking method after folding the main and secondary ladder frames usually uses a single-sided traction cable fixation. This method only secures one side of the ladder, resulting in poor stability and causing the main and secondary ladder frames to sway and wear during vehicle movement, leading to a short service life. Therefore, there is an urgent need for a folding ladder structure with a stable and secure ladder frame to meet practical needs. Utility Model Content

[0003] In order to overcome the above-mentioned technical defects, the purpose of this utility model is to provide a vehicle side ladder device with a double-lock structure. By setting locking structures on both sides of the ladder to form a double-lock structure, the stability and firmness of the locking of the two ladder frames after the ladder is folded are improved, avoiding the wear problem between the ladder frames caused by the lack of firm fixation, and extending the service life.

[0004] To achieve the above objectives, this utility model discloses a vehicle side ladder device with a double-lock structure, comprising: The first ladder frame includes a first ladder frame body and a double-locking structure. One end of the first ladder frame body is a locking end, which is connected to the double-locking structure. The other end of the first ladder frame assembly is a first connecting end. The second ladder includes a second connecting end at one end, which is movably connected to the first connecting end, and a lockable free end at the other end. The second ladder includes a main body and a double-plate structure. The double-plate structure is connected to the lockable free end and is located on both sides of the main body of the second ladder. The double-plate structure and the double-locking structure are lockably connected, so that the first ladder and the second ladder can be fixed and separated.

[0005] Preferably, the double-locking structure includes a pulling component, a traction component, and a pair of self-locking components connected in sequence. The pulling component is located in the middle of the locking end of the first ladder body. A self-locking component is connected to each side of the traction component. When the pulling component is in the pulling state, the traction component is subjected to force and simultaneously applies traction force to the two self-locking components. The self-locking components are subjected to force to open the lock and release the double-locking plate structure of the second ladder. When the pulling component is in the natural state, the traction component returns to its original state and retracts the applied force.

[0006] Preferably, the self-locking assembly includes a traction actuating plate and a spring locking member. The traction actuating plate includes a actuating plate body and a third rotating pin movably connected to the actuating plate body. The actuating plate body includes a traction part and an actuating part. The traction part is connected to the traction assembly, and the actuating part engages with the spring locking member. The third rotating pin is also fixedly connected to the first ladder frame body. When the traction assembly applies a traction force to the traction part in a first direction, the actuating plate body rotates around the third rotating pin, causing the actuating part to apply a pushing force to the spring locking member in a second direction, thereby causing the self-locking assembly to open the lock. The first direction is parallel to and opposite to the second direction.

[0007] Preferably, the spring locking member includes a first rotating member, a second rotating member, and a spring connecting member. The spring connecting member is connected to the first rotating member and the second rotating member respectively. The first rotating member is also in dynamic contact with the second rotating member. When either the first rotating member or the second rotating member rotates, the spring connecting member drives the other first rotating member or the second rotating member to rotate.

[0008] Preferably, the first rotating member includes a first rotating member body and a first rotating pin movably connected to the first rotating member body, and the second rotating member includes a second rotating member body and a second rotating pin movably connected to the second rotating member body. The spring rotating member is wound around the first rotating pin and the second rotating pin and connected to the first rotating member body and the second rotating member body. In the first state, the first rotating member is located in the first position and the second rotating member is located in the third position. At this time, the first rotating member and the second rotating member are in contact. In the second state, the first rotating member body is subjected to the traction force applied by the traction actuating piece, and the first rotating member body rotates upward along the first rotating pin axis, so that the first rotating member rotates from the first position to the second position. The spring connecting member drives the second rotating member body to rotate upward along the second rotating pin axis, so that the second rotating member rotates from the third position to the fourth position. At this time, the first rotating member and the second rotating member are separated. In the third state, the spring connecting member drives the first rotating member to return from the second position to the first position. At this time, the first rotating member and the second rotating member are in contact.

[0009] Preferably, the first rotating member body includes a locking portion and a protrusion. The locking portion engages with the actuating portion of the traction actuating piece. The second rotating member body includes a recess and a locking slot. When the first rotating member and the second rotating member abut against each other, the protrusion engages with the recess, and the locking slot is in a closed state. When the first rotating member and the second rotating member come into contact, the protrusion contacts the outer wall of the recess, and the locking slot pops out to an open state.

[0010] Preferably, the pulling assembly includes a pulling frame, a limiting member, a limiting groove, and a first spring assembly. The limiting member is fixedly connected to the inside of the first ladder frame body. The limiting groove is located in the middle of the pulling frame and nested with the limiting member. One end of the first spring assembly is fixedly connected to the inside of the first ladder frame body, and the other end is fixedly connected to the pulling frame. The pulling frame moves linearly within the track of the limiting groove, and the movement distance is limited by the limiting member. The first spring assembly provides the pulling frame with the elastic force for reciprocating motion.

[0011] Preferably, the traction assembly includes a traction shaft kit and a traction rope. The traction shaft kit is fixed inside the first ladder frame body and located on both sides of the pull frame. The traction shaft kit contacts the traction rope and rotates around its own axis. The traction rope passes through the first spring kit and is connected to the pull frame. The end of the traction rope is connected to the traction actuating piece in the self-locking assembly.

[0012] Preferably, the traction assembly further includes a limiting kit and a second spring kit. The limiting kit is connected to the traction rope, and the second spring kit is nested with the traction rope and disposed at both ends of the traction rope. The pulling frame also includes a limiting groove group, which is nested with the limiting kit to ensure that the pulling frame performs linear movement. One end of the second spring kit abuts against the internal frame of the first ladder body, providing elastic force for the traction rope to return to its original position after the traction rope is pulled.

[0013] Compared with existing technologies, the above technical solution has the following advantages: 1. In this embodiment of the utility model, locking structures are provided on both sides of the ladder to form a double-lock structure, which improves the stability and firmness of locking the two ladder frames after the ladder is folded, avoids wear between the ladder frames caused by insecure fixing, and extends the service life; 2. This utility model embodiment uses a double-lock structure and a double-plate structure to form a locking method on both sides of the ladder. The two ladder frames can be unlocked simply by pulling the frame. When locking, the double-plate structure of the ladder frame only needs to be inserted into the locking port of the double-lock structure to lock it. The operation is simple and convenient. Attached Figure Description

[0014] Figure 1 This is an overall structural diagram of a vehicle side ladder device with a double-lock structure disclosed in this utility model; Figure 2 This is a schematic diagram of the structure of the self-locking component in one embodiment of the present invention; Figure 3 This is a detailed structural diagram of the self-locking component in one embodiment of the present utility model; Figure 4 This is a schematic diagram of the structure of the pulling component and the traction component in one embodiment of the present utility model; Figure 5 This is a detailed structural diagram of the pulling component and the traction component in one embodiment of the present utility model.

[0015] Reference numerals: First ladder frame -1, double lock structure -11, second ladder frame -2, double locking plate structure -22; paddle body -1101, third rotating pin -1102, first rotating component body -1111, first rotating pin -1112, second rotating pin -1113, second rotating component body -1114, pull frame -1121, limiting component -1122, limiting groove -1123, first spring assembly -1124, traction shaft assembly -1131, traction rope -1132, limiting assembly -1133, second spring assembly -1134, limiting groove assembly -1125. Detailed Implementation

[0016] The advantages of this utility model are further illustrated below with reference to the accompanying drawings and specific embodiments.

[0017] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0018] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a vehicle side ladder device with a double-locking structure,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0019] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0020] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0022] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrating this invention and has no specific meaning in itself. Therefore, "module" and "part" can be used interchangeably.

[0023] like Figure 1 As shown, to achieve the above objectives, this utility model discloses a ladder device with a double-locking structure 11, comprising: The first ladder 1 includes a first ladder body and a double-locking structure 11. One end of the first ladder body is a locking end, which is connected to the double-locking structure 11. The other end of the first ladder 1 assembly is a first connecting end. And a second ladder 2, one end of which is a second connecting end, which is movably connected to the first connecting end, and the other end of which is a lockable free end. The second ladder 2 includes a second ladder body and a double locking plate structure 22. The double locking plate structure 22 is connected to the lockable free end and is provided on both sides of the second ladder body. The double locking plate structure 22 is lockably connected to the double locking structure 11, so that the first ladder 1 and the second ladder 2 can be fixed and separated.

[0024] Specifically, the present invention adopts a combination of a double-lock structure 11 and a double-plate structure 22, and sets two unlockable and lockable structures on both sides of the ladder to fully ensure the firmness and stability of the locking of the first ladder and the second ladder, and the locking and unlocking method is simple and convenient; the first connecting end of the first ladder frame 1 and the second connecting end of the second ladder frame 2 are preferably hinged.

[0025] The double-locking structure 11 includes a pulling component, a traction component, and a pair of self-locking components connected in sequence. The pulling component is located in the middle of the locking end of the first ladder frame body. A self-locking component is connected to each side of the traction component. When the pulling component is in the pulling state, the traction component is subjected to force and simultaneously applies traction force to the two self-locking components. The self-locking components are subjected to force to open the lock and release the double locking plate structure 22 of the second ladder frame 2. When the pulling component is in the natural state, the traction component returns to its original state and retracts the applied force.

[0026] like Figure 2-3 As shown, preferably, the self-locking assembly includes a traction actuating plate and a spring locking member. The traction actuating plate includes a actuating plate body 1101 and a third rotating pin 1102 movably connected to the actuating plate body 1101. The actuating plate body 1101 includes a traction part and a actuating part. The traction part is connected to the traction assembly, and the actuating part is engaged with the spring locking member. The third rotating pin 1102 is also fixedly connected to the first ladder frame body. When the traction assembly applies a traction force to the traction part in a first direction, the actuating plate body 1101 rotates around the third rotating pin 1102, causing the actuating part to apply a pushing force to the spring locking member in a second direction, thereby causing the self-locking assembly to open the lock. The first direction is parallel to and opposite to the second direction.

[0027] Specifically, the first direction is the direction in which the traction rope 1132 pulls, and the second direction is the direction in which the lever body 1101 rotates under force and the lever part is raised. In addition, the lock has a recessed lock groove with protrusions on both sides. Opening the lock means that the lock groove of the lock is exposed to the double locking plate structure and can be entered. Correspondingly, the lock is closed when the lock groove of the lock is not exposed to the double locking plate structure and can be entered.

[0028] Furthermore, the spring locking component includes a first rotating component, a second rotating component, and a spring connecting component (not shown in the figure). The spring connecting component is connected to both the first and second rotating components. The first rotating component is also in dynamic contact with the second rotating component. When either the first or second rotating component rotates, the spring connecting component drives the other first or second rotating component to rotate. That is, when the first rotating component is subjected to force and rotates first, the scenario is typically that the traction rope 1132 pulls the actuating part of the actuating plate, causing it to tilt upwards. The actuating part applies a tilting force to the first rotating component, and the first rotating component drives the second rotating component to rotate through the spring connecting component. Similarly, when the second rotating component is subjected to force and rotates first, the scenario is typically that the double locking plate structure 22 extends into the lock, pushing the second rotating component to rotate. The second rotating component drives the first rotating component to rotate through the spring connecting component.

[0029] Furthermore, the first rotating member includes a first rotating member body 1111 and a first rotating pin 1112 movably connected to the first rotating member body 1111. The second rotating member includes a second rotating member body 1114 and a second rotating pin 1113 movably connected to the second rotating member body 1114. The spring rotating member is wound around the first rotating pin 1112 and the second rotating pin 1113, and is connected to the first rotating member body 1111 and the second rotating member body 1114. In the first state, the first rotating member is located in the first position, and the second rotating member is located in the third position, at which time the first rotating member and the second rotating member are in opposition. In the second state, the first rotating member body 1111 is subjected to the traction force applied by the traction actuating piece, and the first rotating member body 1111 rotates upward along the axis of the first rotating pin 1112, so that the first rotating member rotates from the first position to the second position. The spring connector drives the second rotating member body 1114 to rotate upward along the axis of the second rotating pin 1113, so that the second rotating member rotates from the third position to the fourth position. At this time, the first rotating member and the second rotating member are separated. In the third state, the spring connector drives the first rotating member to return from the second position to the first position, at which time the first rotating member and the second rotating member are in contact.

[0030] The first rotating member body 1111 includes a locking part and a protrusion. The locking part engages with the actuating part of the traction actuating piece. The second rotating member body 1114 includes a recess and a locking port. When the first rotating member and the second rotating member abut against each other, the protrusion engages with the recess and the locking port is in a closed state. When the first rotating member and the second rotating member are in contact, the protrusion engages with the outer wall of the recess and the locking port pops out to an open state.

[0031] Specifically, in the first state, the first rotating member and the second rotating member abut against each other, the protrusion and the recess are engaged, and the lock is in a closed state. At this time, the double locking plate structure 22 is inside the lock, and the first ladder 1 and the second ladder 2 are locked. In the second state, which is instantaneous, the engaging part of the first rotating member is lifted by the actuating part of the traction actuating piece, and the body of the first rotating member 1111 rotates around the first rotating pin 1112. As the first rotating body rotates, the stop state between the first rotating member and the second rotating member is broken, and the body of the second rotating member 1114 loses the stop force and rotates under the action of the spring connector. After rotation, the lock pops out. In addition, at this time, there is a gap between the body of the first rotating member 1111 and the body of the second rotating member 1114. In the third state, since the second rotating part body 1114 has rotated, the first rotating part returns to its original position under the elastic force of the spring connector. At this time, the gap between the first rotating part body 1111 and the second rotating part body 1114 disappears, and the protrusion comes into contact with the outer wall of the recess.

[0032] The above three states describe the unlocking process. There is also a locked state, which is similar in principle to the unlocking process but in reverse, as follows: In the fourth state, the lock is closed by the push of the double locking plate structure 22, the second rotating body 1114 rotates under the thrust of the double locking plate structure 22, and at the same time, under the action of the spring connector, the protrusion moves along the outer wall of the recess to the recess, and the first rotating member and the second rotating member return to the state of mutual resistance.

[0033] like Figure 4-5 As shown, preferably, the pulling assembly includes a pulling frame 1121, a limiting member 1122, a limiting groove 1123, and a first spring assembly 1124. The limiting member 1122 is fixedly connected to the inside of the first ladder frame body. The limiting groove 1123 is located in the middle of the pulling frame 1121 and nested with the limiting member 1122. One end of the first spring assembly 1124 is fixedly connected to the inside of the first ladder frame body, and the other end is fixedly connected to the pulling frame 1121. The pulling frame 1121 moves linearly within the track of the limiting groove 1123, and the movement distance is limited by the limiting member 1122. The first spring assembly 1124 provides the pulling frame 1121 with the elastic force for reciprocating motion.

[0034] Preferably, the traction assembly includes a traction shaft assembly 1131 and a traction rope 1132. The traction shaft assembly 1131 is fixed inside the first ladder frame body and located on both sides of the pull frame 1121. The traction shaft assembly 1131 contacts the traction rope 1132 and rotates around its own axis. The traction rope 1132 passes through the first spring assembly 1124 and is connected to the pull frame 1121. The end of the traction rope 1132 is connected to the traction actuating piece in the self-locking assembly, specifically connected to the traction part.

[0035] Specifically, when the pulling frame 1121 moves linearly, it causes the traction rope 1132 to tighten. The traction shaft assembly 1131 rotates around its own axis and provides a limit for the traction rope 1132, preventing the traction rope 1132 from moving outside the range of the traction shaft assembly 1131.

[0036] Furthermore, such as Figure 2 , Figure 5 As shown, the traction assembly also includes a limiting kit 1133 and a second spring kit 1134. The limiting kit 1133 is connected to the traction rope 1132, and the second spring kit 1134 is nested with the traction rope 1132 and disposed at both ends of the traction rope 1132. The pulling frame 1121 also includes a limiting groove group 1125, which is nested with the limiting kit 1133 to ensure that the pulling frame 1121 can perform linear movement. One end of the second spring kit abuts against the internal frame of the first ladder body, and provides the traction rope 1132 with the elastic force to return to its original position after the traction rope 1132 is pulled.

[0037] It should be noted that the embodiments of this utility model have better implementability and are not intended to limit this utility model in any way. Any person skilled in the art may use the above-disclosed technical content to change or modify it into equivalent effective embodiments. However, any modifications or equivalent changes and modifications made to the above embodiments based on the technical essence of this utility model without departing from the content of the technical solution of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A vehicle side ladder device with a double-lock structure, characterized in that, The device includes: The first ladder frame includes a first ladder frame body and a double-locking structure. One end of the first ladder frame body is a locking end, and the locking end is connected to the double-locking structure. The other end of the first ladder frame assembly is a first connecting end. The second ladder includes a second connecting end at one end, which is movably connected to the first connecting end. The other end of the second ladder is a lockable free end. The second ladder includes a main body and a double-plate structure. The double-plate structure is connected to the lockable free end and is located on both sides of the main body of the second ladder. The double-plate structure is lockably connected to the double-locking structure, which allows the first ladder and the second ladder to be fixed and separated.

2. The vehicle side ladder device with a double-lock structure as described in claim 1, characterized in that, The double-locking structure includes a pulling component, a traction component, and a pair of self-locking components connected in sequence. The pulling component is located in the middle of the locking end of the first ladder frame body. A self-locking component is connected to each side of the traction component. When the pulling component is in the pulling state, the traction component is subjected to force and simultaneously applies traction force to the two self-locking components. The self-locking components are subjected to force to open the lock and release the double-locking plate structure of the second ladder frame. When the pulling component is in the natural state, the traction component returns to its original state and retracts the applied force.

3. The vehicle side ladder device with a double-lock structure as described in claim 2, characterized in that, The self-locking assembly includes a traction actuating plate and a spring locking member. The traction actuating plate includes a plate body and a third rotating pin movably connected to the plate body. The plate body includes a traction part and a actuating part. The traction part is connected to the traction assembly, and the actuating part engages with the spring locking member. The third rotating pin is also fixedly connected to the first ladder frame body. When the traction assembly applies a traction force in a first direction to the traction part, the plate body rotates around the third rotating pin, causing the actuating part to apply a pushing force in a second direction to the spring locking member, thereby causing the self-locking assembly to open the lock. The first direction and the second direction are parallel and opposite in direction.

4. The vehicle side ladder device with a double-lock structure as described in claim 3, characterized in that, The spring locking component includes a first rotating component, a second rotating component, and a spring connecting component. The spring connecting component is connected to the first rotating component and the second rotating component respectively. The first rotating component is also in dynamic contact with the second rotating component. When either the first rotating component or the second rotating component rotates, the spring connecting component drives the other first rotating component or the second rotating component to rotate.

5. The vehicle side ladder device with a double-lock structure as described in claim 4, characterized in that, The first rotating member includes a first rotating member body and a first rotating pin movably connected to the first rotating member body. The second rotating member includes a second rotating member body and a second rotating pin movably connected to the second rotating member body. The spring rotating member is wound around the first rotating pin and the second rotating pin and connected to the first rotating member body and the second rotating member body. In the first state, the first rotating member is located in the first position and the second rotating member is located in the third position. At this time, the first rotating member and the second rotating member are in contact. In the second state, the first rotating member body is subjected to the traction force applied by the traction actuating piece. The first rotating member body rotates upward along the first rotating pin axis, so that the first rotating member rotates from the first position to the second position. The spring connecting member drives the second rotating member body to rotate upward along the second rotating pin axis, so that the second rotating member rotates from the third position to the fourth position. At this time, the first rotating member and the second rotating member are separated. In the third state, the spring connecting member drives the first rotating member to return from the second position to the first position. At this time, the first rotating member and the second rotating member are in contact.

6. The vehicle side ladder device with a double-lock structure as described in claim 5, characterized in that, The first rotating component body includes a locking portion and a protrusion. The locking portion engages with the actuating portion of the traction actuating piece. The second rotating component body includes a recess and a locking port. When the first rotating component and the second rotating component abut against each other, the protrusion engages with the recess and the locking port is in a closed state. When the first rotating component and the second rotating component are in contact, the protrusion engages with the outer wall of the recess and the locking port pops out to an open state.

7. A vehicle side ladder device with a double-lock structure as described in claim 2, characterized in that, The pulling assembly includes a pulling frame, a limiting member, a limiting groove, and a first spring assembly. The limiting member is fixed inside the first ladder frame body. The limiting groove is located in the middle of the pulling frame and nested with the limiting member. One end of the first spring assembly is fixed inside the first ladder frame body, and the other end is fixed to the pulling frame. The pulling frame moves linearly within the track of the limiting groove, and the movement distance is limited by the limiting member. The first spring assembly provides the pulling frame with a reciprocating elastic force.

8. The vehicle side ladder device with a double-lock structure as described in claim 7, characterized in that, The traction assembly includes a traction shaft kit and a traction rope. The traction shaft kit is fixed inside the first ladder frame body and located on both sides of the pull frame. The traction shaft kit contacts the traction rope and rotates around its own axis. The traction rope passes through the first spring kit and is connected to the pull frame. The end of the traction rope is connected to the traction actuating piece in the self-locking assembly.

9. A vehicle side ladder device with a double-lock structure as described in claim 8, characterized in that, The traction assembly further includes a limiting kit connected to the traction rope, and the pulling frame further includes a limiting groove group nested with the limiting kit to ensure that the pulling frame moves in a straight line.

10. A vehicle side ladder device with a double-lock structure as described in claim 8, characterized in that, The traction assembly also includes a second spring assembly, which is nested with the traction rope and located at both ends of the traction rope. One end of the second spring assembly abuts against the internal frame of the first ladder body, providing elastic force for the traction rope to return to its original position after the traction rope is pulled.

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