An emergency quick-release chain for a car side door lock based on a singular configuration

Abstract

This invention discloses an emergency quick-release branch chain for an automotive side door lock based on a singular configuration. It, along with the door lock housing, ratchet and pawl mechanism, and pawl disc, constitutes the automotive side door lock. The emergency quick-release branch chain includes an emergency opening arm, an emergency opening rocker arm, a main spring, an emergency opening connecting rod, and a miniature deep groove ball bearing. A collapsible and compatible structure is formed by the miniature bearing roller and the emergency opening connecting rod groove, enabling multi-mode movement and inter-branch movement compatibility in emergency opening, emergency opening reset, manual opening, and locking modes. The emergency quick-release branch chain is directly hinged to the pawl and acts independently of the pawl disc. The main spring is hinged to the emergency opening arm and the emergency opening rocker arm, initially in a stretched state. Under operating force, the emergency opening arm rotates clockwise, stretching the main spring to store energy. When the main spring experiences a singular configuration, it abruptly releases energy, accelerating the emergency opening rocker arm to rotate counterclockwise, pushing the emergency opening connecting rod, and causing the pawl to rotate clockwise, thus achieving emergency quick opening of the automotive door lock.

Description

Technical Field

[0001] This invention belongs to the field of automotive door lock technology, specifically relating to an emergency quick-connection chain for automotive side door locks based on a singular configuration. Background Technology

[0002] With the popularization of new energy vehicles and the promotion of autonomous driving, the functions of car door locks are changing rapidly, and their ability to cope with emergencies needs to meet higher requirements. The development of their emergency rapid dismantling chain has become a key issue that urgently needs to be solved.

[0003] From the perspective of the safety and reliability of automotive side door locking systems, the internal components of the side door locks may fail, and the central locking system may also fail. Collisions, human error, and harsh environments are all possible causes for side door locking system malfunctions. When a side door locking system malfunctions, it may be unable to open normally. In an emergency, passengers may be trapped inside, seriously endangering their lives. Therefore, there is an urgent need to design an emergency quick-access branch chain to enable opening in emergency situations.

[0004] Design an emergency quick-opening branch chain to directly open car door locks, preventing occupants from being unable to open the car door in an emergency and improving the safety performance of car door locks. This emergency quick-opening branch chain must meet the following performance requirements: (1) Short opening time: The opening action should be completed in the shortest possible time to facilitate passengers to quickly exit from the side door. (2) Low opening force: Even with very little force, the car door lock can be opened, ensuring that the opening action of the emergency quick-opening branch chain is completed smoothly. (3) High opening priority: The car door lock can be opened in the unlock / lock state, the state where other opening chains fail, or the state where the central locking fails. (4) Multi-branch active and passive motion compatibility: Achieve various working conditions, satisfy the compatibility between other branches and the emergency quick-opening branch chain, and avoid interference. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an emergency quick-opening branch chain for a car side door lock based on a singular configuration. This emergency quick-opening branch chain is connected to the door lock body assembly and is used to realize the emergency opening of the car door lock. It does not interfere with other branches inside the car door lock and has a high opening priority. Furthermore, by utilizing the singular configuration and the change in elastic potential energy of the main spring during the movement of the mechanism, the emergency quick-opening branch chain not only avoids the risk of automatic opening but also reduces the emergency opening force and improves the opening speed.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An emergency quick-release branch for a car side door lock based on a unique configuration is characterized in that the emergency quick-release branch is connected in parallel with the main control opening branch on the door lock body; the door lock body includes a ratchet and pawl mechanism, wherein the ratchet and pawl are rotatably connected to a first rotating shaft and a second rotating shaft fixed on the housing, respectively; the ratchet and pawl are provided with mutually meshing ratchet meshing teeth and pawl meshing teeth, as well as a groove for engaging the lock pin; the engagement or disengagement of the ratchet and pawl controls the engagement or release of the lock pin in the groove between the ratchet and pawl; the main control opening branch is connected to the pawl and controls the ratchet to perform the action of releasing the lock pin; the emergency quick-release branch includes an emergency opening arm, an emergency opening rocker, and a main spring. The system includes a spring and an emergency opening linkage. The left end of the emergency opening linkage is connected to the pawl via a planar-rotational composite connection, and its right end is rotatably connected to the left end of the emergency opening rocker via a second connecting shaft. The middle part of the emergency opening rocker is rotatably connected to a third rotating shaft fixed to the housing, and its right end is provided with a second rotation limiting structure that restricts its rotation range. One end of the main spring is fixedly connected to the second connecting shaft, and the other end is fixedly connected to a first connecting shaft at the distal end of the rotation center of the emergency opening arm. The rotation center shaft of the emergency opening arm is fixedly connected to the housing, and a third rotation limiting structure that restricts its rotation range is provided on it. A first rotation limiting structure that restricts the rotation range of the pawl is fixed on the housing.

[0008] Preferably, a clockwise rotational force is applied to the emergency unlocking arm to control the pawl to release the locking pin, thereby achieving emergency unlocking. During the emergency unlocking process, the emergency quick-release chain sequentially experiences five motion position states: locked position, first singular position, second singular position, ratchet and pawl disengaged position, and unlocked position. In the locked position, the center of the second connecting shaft and the center of the third rotating shaft are located on the right and left sides of the rotating arm of the emergency unlocking arm, respectively, and the main spring has a tension preload. The first rotational limiting structure, the second rotational limiting structure, and the third rotational limiting structure respectively limit the counterclockwise rotational freedom of the pawl, the clockwise rotational freedom of the emergency unlocking rocker, and the counterclockwise rotational freedom of the emergency unlocking arm. In the first singular position, the line of action of the main spring is collinear with the center of the third rotating shaft. In the second singular position, the main spring... The line is collinear with the emergency opening arm; in the ratchet and pawl disengaged position, the force between the ratchet and pawl is zero; in the unlocked position, the locking pin is released; the center of the second connecting shaft and the center of the third rotating shaft are located on the left and right sides of the emergency opening arm's rotational force arm, respectively; the second rotation limiting structure and the third rotation limiting structure respectively limit the clockwise rotational freedom of the emergency opening lever and the counterclockwise rotational freedom of the emergency opening arm; between the locked position and the first singular configuration, the main spring is continuously stretched; between the first singular configuration and the second singular configuration, the emergency opening lever and pawl begin to move, and the main spring continuously returns; between the second singular configuration and the unlocked position, the movement of the emergency opening lever and pawl is no longer related to the operating force, and the main spring continuously returns.

[0009] Preferably, the planar moving and rotating composite connecting pair is composed of a fourth rotating shaft and a first annular waist hole. The fourth rotating shaft is fixed on the left ear plate of the pawl, and the first annular waist hole is located at the left end of the emergency opening link. The lower end of the fourth rotating shaft is nested in the first annular waist hole. In the locked position, the fourth rotating shaft is located at the right limit position of the first annular waist hole.

[0010] More preferably, a deep groove ball bearing is fixedly connected to the lower end of the fourth rotating shaft, and the outer ring of the deep groove ball bearing is fitted with the first annular waist hole with a small clearance.

[0011] Preferably, the rotation center shaft of the emergency opening arm is fixedly connected to the housing via a support plate, and the support plate is fixed to the housing via a second rotating shaft and a support shaft; the third rotation limiting structure consists of a third limiting shaft and a third annular waist hole, the third annular waist hole is provided on the emergency opening arm, and the third limiting shaft is fixed to the support plate and embedded in the third annular waist hole; in the locked position, the third limiting shaft is located at the left limit position of the third annular waist hole.

[0012] Preferably, the second rotation limiting structure is composed of a second annular waist hole and a second limiting shaft. The second annular waist hole is opened at the right end of the emergency opening rocker, and the second limiting shaft is fixed on the housing and embedded in the second annular waist hole. In the locked position, the second limiting shaft is located at the right limit position of the second annular waist hole.

[0013] Preferably, a ratchet torsion spring and a pawl torsion spring are respectively mounted on the first rotating shaft and the second rotating shaft. One end of each torsion spring is fixed to the housing, and the other end is fixed to the ratchet or pawl. In the locked position, the ratchet torsion spring has a torsional preload that causes the ratchet to rotate clockwise, and the pawl torsion spring has a torsional preload that causes the pawl to rotate counterclockwise.

[0014] More preferably, the pawl is further provided with a limiting protrusion, which cooperates with the first limiting block fixed on the housing to form the first rotation limiting structure.

[0015] Preferably, the main control opening chain includes a pawl disc, a pawl disc torsion spring, and an outer opening arm. Both the outer opening arm and the pawl disc are rotatably connected to a second rotating shaft fixed to the housing. The outer opening arm, pawl disc, and pawl are sequentially overlapped in one direction. The pawl disc torsion spring is fitted onto the center of the pawl disc and the second rotating shaft, with one end fixedly connected to the pawl disc and the other end fixedly connected to the second rotating shaft. During the operation of the outer opening arm to actively open the side door lock, the fourth rotating shaft moves away from the right limit position of the first annular waist hole, slides within the first annular waist hole, and does not contact the left limit position of the first annular waist hole.

[0016] More preferably, the outward opening arm is a "Z"-shaped plate, with a hole on its lower horizontal plate for connection to the second rotating shaft, and its upper horizontal plate serving as the first operating handle, with a main control system connection structure; the pawl disc is a fan-shaped plate, with a hole at its apex for connection to the second rotating shaft, an outward protrusion at its right corner as a second overlapping structure, and a downward protrusion at its central edge as a third overlapping structure; the pawl is a two-eared annular plate, with an annular plate at its center and a hole for connection to the second rotating shaft, teeth on its right ear plate for meshing with the ratchet, and an upward protrusion on its left ear plate on the opposite side as a fourth overlapping structure; the pawl, the outward opening arm, and the pawl disc are arranged sequentially from bottom to top on the second rotating shaft.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. Based on the main spring and the singular configuration of the mechanism, the emergency quick-release branch chain of the car door lock is constructed. In the emergency opening condition, the emergency opening arm is subjected to the operating force to perform the unlocking and resetting locking actions. During this process, the mechanism undergoes two singular configurations and has the characteristics of a variable topology structure. This effectively avoids the risk of automatic opening, reduces the emergency opening force, and improves the opening speed.

[0019] 2. The mechanism composed of miniature deep groove ball bearings and emergency opening linkage grooves in the emergency quick-release branch chain of the present invention can be equivalent to three mechanism motion modes under different working conditions: double rocker, swing guide rod, and five-bar mechanism. It avoids the need for a compatible structure to realize the multi-mode motion of the car door lock master control opening, emergency opening, emergency opening reset and locking, and ensures the motion compatibility of the multi-functional branch chain inside the car door lock.

[0020] 3. The emergency quick-release branch of the present invention is directly connected to the ratchet and pawl mechanism and is connected in parallel with the main control opening branch. It can open the car door lock in the unlocked / locked state, the failure state of other opening chains, or the failure state of the central locking system, thus ensuring the high priority of the emergency opening branch of the car door lock.

[0021] 4. The emergency quick-release branch chain of the present invention is directly hinged to the pawl. During emergency opening, it is not affected by the pawl disc and the pawl disc torsion spring. Compared with the main control opening, during emergency opening, it only needs to overcome the pawl torsion spring force, which reduces the opening force. At the same time, the main spring is preloaded at the initial position and is in a tensile state, storing a certain amount of energy. Even if the force is very small, the car door lock can be opened, ensuring that the emergency quick-release branch chain opening action is completed smoothly.

[0022] 5. The emergency opening rocker and emergency opening linkage of the present invention are arranged between the ratchet and pawl mechanism and the housing, and the emergency opening arm and main spring are arranged between the ratchet and pawl mechanism and the pawl disc, making full use of the limited space inside the lock; the limiting block restricts the range of motion of the car door lock components, maintains the movement state of the components when in contact with the components, enables each branch to perform specific actions, and ensures the compactness of the car door lock structure. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the automotive side door lock structure according to an embodiment of the present invention;

[0024] Figure 2 This is an exploded view of the automotive side door lock according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the ratchet and pawl mechanism according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the main control branch structure according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the emergency rapid branch chain structure according to an embodiment of the present invention. Figure 1 ;

[0028] Figure 6 This is a schematic diagram of the emergency rapid branch chain structure according to an embodiment of the present invention. Figure 2 ;

[0029] Figure 7 This is a schematic diagram of the emergency opening linkage structure according to an embodiment of the present invention;

[0030] Figure 8(a) is a schematic diagram of the process of the car side door lock moving from fully locked to fully open under the main control opening condition according to an embodiment of the present invention;

[0031] Figure 8(b) is a schematic diagram of the emergency rapid branch chain movement process under the main control start-up condition of the present invention;

[0032] Figure 8(c) is a schematic diagram of the moving components and the equivalent mechanism under the main control opening and locking conditions of an embodiment of the present invention;

[0033] Figure 9(a) is a schematic diagram of the initial position of the emergency quick-release chain and a schematic diagram of the mechanism under the emergency opening condition of an embodiment of the present invention;

[0034] Figure 9(b) is a schematic diagram of the first singular configuration of the emergency quick-connect branch and a schematic diagram of the mechanism under the emergency opening condition of an embodiment of the present invention;

[0035] Figure 9(c) is a schematic diagram of the second singular configuration of the emergency quick-opening branch chain and a schematic diagram of the mechanism under the emergency opening condition of an embodiment of the present invention;

[0036] Figure 9(d) is a schematic diagram of the emergency quick-release chain ratchet and pawl disengaging under emergency opening conditions according to an embodiment of the present invention;

[0037] Figure 9(e) is a schematic diagram of the final position of the emergency quick-release branch chain and a schematic diagram of the mechanism under the emergency opening condition of an embodiment of the present invention;

[0038] Figure 9(f) is a schematic diagram of the equivalent mechanism of the moving component under the emergency opening and emergency opening reset conditions according to an embodiment of the present invention;

[0039] Figure 10(a) is a schematic diagram of the initial position of the emergency quick-release branch chain and a schematic diagram of the mechanism under the emergency opening and reset condition of an embodiment of the present invention;

[0040] Figure 10(b) is a schematic diagram of the first singular configuration of the emergency quick branch chain and a schematic diagram of the mechanism under the emergency opening and reset condition according to an embodiment of the present invention;

[0041] Figure 10(c) is a schematic diagram of the second singular configuration of the emergency quick-connect branch under the emergency opening and reset condition and a schematic diagram of the mechanism in an embodiment of the present invention;

[0042] Figure 10(d) is a schematic diagram of the final position of the emergency quick-release branch chain and a schematic diagram of the mechanism under the emergency opening and reset condition of the present invention;

[0043] Figure 11 This is a schematic diagram of the movement process of the car side door lock under the locking condition according to an embodiment of the present invention.

[0044] In the diagram: 1-Housing, 2-First rotating shaft, 3-Ratchet and pawl mechanism, 301-Ratchet, 3011-Ratchet meshing teeth, 302-Pawl, 3021-Fourth overlapping structure, 3022-Pawl limiting protrusion, 3023-Pawl meshing teeth. 303-First limiting block, 304-Ratchet torsion spring, 305-Pawl torsion spring, 4-Second rotating shaft, 5-Pawl disc, 51-Second overlapping structure, 52-Third overlapping structure, 53-Second operating handle, 6-Emergency quick-release chain, 601-Emergency opening arm, 6011-First connecting shaft, 6012-Third annular waist hole, 602-Second limiting shaft, 603-Emergency opening rocker arm, 6031-Second connecting shaft, 6032-Second annular waist hole, 604-Third rotating shaft, 605-Main spring, 606-Emergency opening linkage, 6061-First annular waist hole, 607-Fourth rotating shaft, 608-Miniature deep groove ball bearing, 609-Fifth rotating shaft, 610-Third limiting shaft, 7-Outer opening arm, 71-First overlapping structure, 8-Support plate, 9-Support shaft, 10-Pawl disc torsion spring. Detailed Implementation

[0045] To make the technical means, creative features, objectives and effects of this invention easier to understand, the following embodiments are described in detail with reference to the accompanying drawings. It should be noted that the description of these embodiments is for the purpose of helping to understand this invention, but does not constitute a limitation of this invention.

[0046] It should be noted that in the description of this invention, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. When two elements are "fixedly connected" or "rotationally connected," the two elements can be directly connected or there may be an intermediate element. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element. The fixed or fixed connection method can be screwed, welded, riveted, plugged, or connected through a third component. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] A car side door lock, installed on the car door, is compatible with a lock cylinder installed on the vehicle body to lock and unlock the door; it primarily solves the problem of emergency opening of the car side door in case of side door lock system malfunction or emergency. Figure 1 As shown in Figure 2, in this embodiment, the car side door lock includes three components: the door lock body, the main control opening branch chain, and the emergency quick-opening branch chain 6.

[0048] The door lock body includes a housing 1, a ratchet and pawl mechanism 3, and a first rotating shaft 2 and a second rotating shaft 4 connecting the housing 1 and the ratchet and pawl mechanism 3. Figure 3As shown, the ratchet and pawl mechanism 3 includes a ratchet 301, a pawl 302, a first limiting block 303, a ratchet torsion spring 304, and a pawl torsion spring 305. The ratchet 301 and pawl 302 are rotatably connected to the housing 1 via a first rotating shaft 2 and a second rotating shaft 4, respectively. The ratchet torsion spring 304 and the pawl torsion spring 305 are respectively mounted on the first rotating shaft 2 and the second rotating shaft 4. One end of each torsion spring is fixed to the housing 1, and the other end is fixed to the ratchet 301 or the pawl 302, for providing reverse rotation of the ratchet 301 and the pawl 302. The ratchet 301 and pawl 302 are provided with meshing teeth 3011 and 3023, and a groove for engaging the locking pin. The engagement or disengagement of the ratchet 301 and pawl 302 controls the engagement or release of the locking pin in the groove between the ratchet 301 and pawl 302, thereby achieving the locking or unlocking of the door lock. In the locked state (initial state), the ratchet torsion spring 304 has elastic potential energy to rotate the ratchet 301 clockwise, and the pawl torsion spring 305 has elastic potential energy to rotate the pawl 302 counterclockwise. The pawl 302 is also provided with a limiting protrusion 3022, which cooperates with the first limiting block 303 fixed on the housing 1 to limit the counterclockwise rotation range of the pawl 302.

[0049] The main control opening chain includes a ratchet disc 5, a ratchet disc torsion spring 10, and an outer opening arm 7; such as Figure 4 As shown, the outer opening arm 7 and the pawl disk 5 are rotatably connected to the housing 1 (above the pawl 302) via the second rotating shaft 4. The outer opening arm 7, the pawl disk 5, and the pawl 302 overlap sequentially in one direction, so that when the outer opening arm 7 rotates in the forward direction, it sequentially pushes the pawl disk 5 and the pawl 302 to rotate in the forward direction, and when the outer opening arm 7 rotates in the reverse direction, it does not generate rotational thrust on the pawl disk 5 and the pawl 302. One method of unidirectional overlap is as follows: the outer opening arm 7, the pawl disk 5, and the pawl 302 are respectively provided with a first overlap structure 71, a second overlap structure 51, a third overlap structure 52, and a fourth overlap structure 3021. The first overlap structure 71 and the second overlap structure 51 overlap on the left side of the outer opening arm 7, and the third overlap structure 52 and the fourth overlap structure 3021 overlap on the left side of the pawl disk 5. Preferably, as shown... Figure 5As shown, the outward opening arm 7 is a "Z"-shaped plate, with a hole on its lower horizontal plate for connection to the second rotating shaft 4, and its upper horizontal plate serving as the first operating handle, with a connection structure for connection to the vehicle lock central control system or electronic control system (main control system); the pawl disc 5 is a fan-shaped plate, with a hole at its top corner for connection to the second rotating shaft 4, and an outward protrusion structure at its right corner as the second overlapping structure 51, and a downward protrusion structure at its middle edge as the third overlapping structure 52; the pawl 302 is a two-eared annular plate, with an annular plate at its center, a hole for connection to the second rotating shaft 4, and teeth on its right ear plate for meshing with the ratchet 301, and an upward protrusion structure on its left ear plate on the opposite side as the fourth overlapping structure 3021; ​​the pawl 302, the outward opening arm 7, and the pawl disc 5 are arranged sequentially from bottom to top on the second rotating shaft 4. A pawl disc torsion spring 10 is fitted onto the center of the pawl disc 5 and the second rotating shaft 4, with one end fixedly connected to the pawl disc 5 and the other end fixedly connected to the second rotating shaft 4, to provide the reverse rotation torque of the pawl disc 5. Preferably, a second operating handle 53 is also provided on the pawl disc 5 to directly drive the pawl disc 5 to rotate forward, thereby pushing the pawl to rotate forward and unlocking the door.

[0050] The emergency quick-release branch chain 6 of this invention is based on a main spring and a singular configuration of the mechanism. Its working principle is as follows: In the locked state (initial position), the main spring is pre-tensioned. In the emergency opening condition, the emergency opening arm is rotated clockwise by the operating force and the main spring. The mechanism undergoes two singular configurations and has the characteristics of a variable topology. The main spring has the characteristics of energy storage buffering and energy release acceleration. Combined with the deformation and abrupt change characteristics of the singular configuration of the mechanism, the elastic potential energy of the main spring is converted into the kinetic energy of each link, which has an acceleration effect on the movement of the mechanism. This makes the emergency quick-release branch chain open quickly and in a short time, which is convenient for passengers to quickly get out of the side door. It is suitable for emergency opening of the car side door lock in an emergency.

[0051] like Figure 6 As shown, the emergency quick-release branch chain 6 includes an emergency opening arm 601, an emergency opening rocker arm 603, a main spring 605, and an emergency opening linkage 606.

[0052] A one-way drive sliding connection pair is provided between the pawl 302 and the emergency opening linkage 606, such as... Figure 7As shown, the upper end of the fourth rotating shaft 607 is fixed to the left ear plate of the pawl 302, and its lower end is nested in the first annular waist hole 6061 located at the left end of the emergency opening link 606. When the emergency opening link 606 rotates counterclockwise relative to the pawl 302 (the pawl 302 is the driving member of this kinematic pair), the fourth rotating shaft 607 only slides within the first annular waist hole 6061 and does not generate an interaction force between the two. When the emergency opening link 606 rotates clockwise relative to the pawl 302 (the emergency opening link 606 is the driving member of this kinematic pair), the fourth rotating shaft 607 (miniature deep groove ball bearing 608) is always in contact with the first annular waist hole 6061, and the emergency opening link 606 generates a unidirectional force on the pawl 302. To reduce friction between the fourth rotating shaft 607 and the first annular waist hole 6061 during translation and to improve the accuracy and smoothness of the translation trajectory, a miniature deep groove ball bearing 608 is fixedly connected to the lower end of the fourth rotating shaft 607. The outer ring of the miniature deep groove ball bearing 608 is fitted with the first annular waist hole 6061 with a small clearance.

[0053] The right end of the emergency opening linkage 606 is rotatably connected to the left end of the emergency opening rocker 603 via a second connecting shaft 6031 fixed to the emergency opening rocker 603. The middle part of the emergency opening rocker 603 is rotatably connected to the housing 1 via a third rotating shaft 604, and its right end is limited by a second annular waist hole 6032 and a second limiting shaft 602 embedded in the hole. One end of the main spring 605 is fixedly connected to the second connecting shaft 6031, and the other end of the main spring is fixedly connected to the first connecting shaft 6011 at the right end (far end of the rotation center) of the emergency opening arm 601. The left end (rotation center) of the emergency opening arm 601 is rotatably connected to the housing 1, and a limiting structure is provided to limit its rotation range. To coordinate the spatial positions of the various parts on the door lock and ensure their movement, an emergency opening arm 601 is connected to the housing 1 via a support member. One implementation structure is as follows: the left end of the emergency opening arm 601 is fixed to the support plate 8 via a rotating shaft 609; a third annular waist hole 6012 is provided at the front end of the emergency opening arm 601, and the rotation range of the emergency opening arm 601 is limited by a third limiting shaft 610 that is embedded in the waist hole and fixed to the support plate 8; the left end of the support plate 8 is rotatably connected to the second rotating shaft 4 (axially fixed), and the right end is fixed to the housing 1 via a support shaft 9.

[0054] During the main control opening process of the external opening arm 7, the mechanism formed by the external opening arm 7, the emergency opening rocker 603, the emergency opening linkage 606, the fourth rotating shaft 607 (including the miniature deep groove ball bearing 608), and the pawl 302 (CBEF) is in a five-bar linkage motion mode; the fourth rotating shaft 607 slides in the first annular waist hole 606, and is in a follow-up avoidance mode to ensure compatibility between active opening and emergency opening movements.

[0055] The following content illustrates the technical effect of an emergency quick-release chain for a car side door lock based on a singular configuration by describing the movement process of the car side door lock.

[0056] The car side door lock has four working states: master control opening, emergency opening, emergency opening reset, and locking. The operation process of these four working states is described in detail below.

[0057] 1. Main controller enabled:

[0058] As shown in Figure 8(a), under the master control opening condition, the outer opening arm 7 rotates clockwise under the action of the operating force, causing the pawl disc 5 to rotate clockwise, or the pawl disc 5 rotates clockwise, pushing the pawl 302 to rotate clockwise. The ratchet 301 and the pawl 302 disengage, and the ratchet 301 rotates clockwise under the action of the ratchet torsion spring 304, releasing the locking pin in the slot and realizing the opening of the car side door lock. Upon releasing the operating force, the pawl 302 rotates counterclockwise to reset under the action of the pawl torsion spring 305, and the pawl disc 5 rotates counterclockwise to reset under the action of the pawl disc torsion spring 10. The car side door lock mechanism sequentially goes through five motion states: master control opening initial position -- ratchet and pawl disengagement -- ratchet clockwise rotation -- pawl and pawl disc reset -- master control opening final position.

[0059] As shown in Figure 8(b), during the main control opening process, the emergency opening arm 601 and emergency opening rocker 603 of the emergency quick-release branch chain 6 are stiffened and stationary under the preload of the main spring 605, the action of the third limit shaft 610 and the second limit shaft 602. In the initial state, the miniature deep groove ball bearing 608 on the fourth rotating shaft 607 is positioned at the right limit position of the first annular waist hole 6061. However, during the operation of the external opening arm 7 to control the opening, and during the operation of the external opening arm 7 to actively open the side door lock, the fourth rotating shaft 607 leaves the right limit position of the first annular waist hole 6061 and slides in the first annular waist hole 6061 without contacting the left limit position of the first annular waist hole 6061. Throughout the process, the pawl 302 rotates clockwise, and the fourth rotating shaft 607 (miniature deep groove ball bearing 608) on it only slides in the first annular waist hole 6061 on the emergency opening linkage 606, without generating a rotational force on the emergency opening linkage 606. At this time, the mechanism composed of the emergency opening rocker 603, the emergency opening linkage 606, the miniature deep groove ball bearing 608, and the pawl 302 (CBEF) is equivalent to a double rocker mechanism, as shown in Figure 8(c).

[0060] 2. Emergency Activation:

[0061] In case of a malfunction of the main control unlocking chain or other emergency, the emergency unlocking chain can be used to unlock the car side door lock: applying an operating force F1 to the emergency unlocking arm 601 to rotate it clockwise will unlock the car side door lock. During the unlocking process, the emergency unlocking chain goes through five motion states in sequence: emergency unlocking initial position (locked position) -- emergency unlocking first singular position -- emergency unlocking second singular position -- ratchet and pawl disengagement -- emergency unlocking final position (unlocked position), as shown in Figures 9(a) to 9(e). During this stage, the fourth rotating shaft 607 (miniature deep groove ball bearing 608) is always in contact with the first annular waist hole 6061, and the mechanism composed of the emergency unlocking rocker 603, emergency unlocking connecting rod 606, miniature deep groove ball bearing 608 and pawl 302 is equivalent to a swing guide rod mechanism, as shown in Figure 9(f).

[0062] As shown in Figure 9(a), in the initial position of emergency opening, the center (B) of the second connecting shaft 6031 and the center (C) of the third rotating shaft 604 are located on both sides of the rotating arm (AD) of the emergency opening arm 601, respectively. The third limiting shaft 610 and the second limiting shaft 602 are located at the left and right limit positions of the third annular waist hole 6012 and the second annular waist hole 6032, respectively. The main spring 605 is preloaded and in a stretched state. Under the action of the preload of the main spring, the emergency opening arm 601 has a reverse rotation around the fifth rotating shaft 609(D). The clockwise rotation trend is in contact with the third limiting shaft 610; the emergency opening rocker 603 has a clockwise rotation trend around the center (C) of the third rotating shaft 604 and is in contact with the second limiting shaft 602; the pawl 302 is in contact with the first limiting block 303 under the action of the pawl torsion spring 305, and the ratchet 301 is in contact with the limiting structure on the housing 1 under the combined action of the torsion spring force and the pawl 302; the ratchet and pawl mechanism 3 is in the fully locked position under the action of the ratchet torsion spring 304, the pawl torsion spring 305 and the sealing reaction force, and the emergency opening branch is in a stable state.

[0063] When an operating force F1 is applied to the emergency opening arm 601 to rotate clockwise, the emergency opening arm 601 rotates clockwise around the fifth pivot 609 (D), gradually disengaging from the third limiting pivot 610. The main spring 605 is stretched and stores energy until it reaches the first singular configuration of emergency opening. During this process, the emergency opening rocker 603 tends to rotate clockwise around the third pivot 604 (C) under the tension of the main spring, but due to the action of the second limiting pivot 602, the emergency opening rocker 603 remains stationary, thereby keeping the emergency opening linkage 606 and the pawl 302 stationary.

[0064] As shown in Figure 9(b), in the first singular configuration of emergency opening, the line of action (AB) of the main spring 605 is collinear with the centers (C, B) of the two rotation axes of the emergency opening rocker 603, i.e., points A, B, and C are collinear. The main spring 605 reaches its maximum deformation and its stored energy reaches its maximum value. The component of the tension of the main spring 605 on the lever arm (BC) perpendicular to the emergency opening rocker 603 is zero, but the component on the rotation lever arm (AD) perpendicular to the emergency opening arm 601 is not zero (this component causes the emergency opening arm 601 to have a counterclockwise rotation tendency). Therefore, the first singular configuration of emergency opening is an unstable state, i.e., a transient state. If the operating force F1 is released before reaching the first singular configuration, the emergency opening arm 601 will rotate counterclockwise under the action of the main spring force and return to the initial position of emergency opening, thus avoiding the risk of automatic door opening caused by the instantaneous force acting on the emergency opening arm 601.

[0065] At the first singular configuration of the emergency opening mechanism, an operating force F1 is applied to rotate the emergency opening arm 601 clockwise. The motion state of the moving component changes abruptly, and the main spring 605 will recover and release energy. Its potential energy is converted into the kinetic energy of each rod, accelerating the opening of the emergency opening chain. During this process, the torque direction of the main spring force acting on the lever arm of the emergency opening rocker 603 changes, causing the emergency opening rocker 603 to rotate counterclockwise around the third pivot 604 (C), disengaging from the second limit shaft 602, and pushing the emergency opening linkage 606 to rotate clockwise around the second connecting shaft 6031 (B) through the second connecting shaft 6031 (B). At this time, the fourth pivot 607 (E) is engaged with the first annular waist hole 6061, and the pawl 302 rotates clockwise around the second pivot (F), driving the ratchet 301 to rotate counterclockwise around the first pivot 2 (G), starting the disengagement movement from the ratchet 301. The kinematic pair H between the two gradually disengages until the second singular configuration of the emergency opening mechanism is reached.

[0066] As shown in Figure 9(c), in the second singular configuration of the emergency opening, the line of action (AB) of the main spring 605 is collinear with the lever arm (AD) of the emergency opening arm 601, that is, points A, B, and D are collinear. At this time, the component force of the main spring 605 in the direction perpendicular to the lever arm of the emergency opening arm 601 is zero, but the component force in the direction perpendicular to the lever arm (BC) of the emergency opening rocker 603 is not zero. Therefore, it is also an unstable state, that is, a transient state.

[0067] At the second singular configuration of the emergency opening mechanism, the motion state of the moving components will undergo another abrupt change. The main spring 605 continues to retract and release potential energy, accelerating the movement of each link. At this time, the torque of the main spring 605 acting on the lever arm (BC) of the emergency opening rocker 603 is still counterclockwise, causing the pawl 302 to continue rotating clockwise to disengage until the ratchet 301 and the pawl 302 disengage. Meanwhile, the torque of the main spring 605 acting on the lever arm (AD) of the emergency opening arm 601 becomes clockwise, causing the lever arm (AD) of the emergency opening arm 601 to accelerate away from the action of the operating force F1 and continue to rotate clockwise, as shown in Figure 9(d). After this, the movement of the emergency opening arm 601 will no longer be related to the operating force F1. After disengagement, the ratchet 301 rotates clockwise under the action of the ratchet torsion spring 304, quickly moving to the fully open position, releasing the locking pin, and unlocking the mechanism.

[0068] As shown in Figure 9(e), when the emergency opening final position is reached, the elastic potential energy of the main spring 605 is fully released, the emergency opening arm 601 is in contact with the third limiting shaft 610 and is limited to the clockwise rotational degree of freedom; the emergency opening rocker 603 is in contact with the second limiting shaft 602 and is limited to the counterclockwise rotational degree of freedom; the pawl 302 is in contact with the limiting member on the housing 1, the ratchet 301 is in contact with the limiting member on the housing 1, the ratchet 301 and the pawl 302 are in the fully open position, the lock pin is disengaged from the ratchet 301, and the car side door lock is opened. At this time, if a momentary counterclockwise torque is applied to the emergency opening arm 601 (this torque fails to return the emergency quick-release branch 6 to the second singular emergency opening configuration), the main spring 605 is stretched. When the momentary torque is released, the force of the main spring 605 will cause the emergency opening arm 601 and the emergency opening rocker 603 to return to the final emergency opening position. If a momentary clockwise torque is applied to the emergency opening arm 601, the main spring 605 is compressed. When the momentary torque is released, the force of the main spring 605 will also cause the emergency opening arm 601 and the emergency opening rocker 603 to return to the final emergency opening position. That is, in the final emergency opening position, the emergency opening branch is in a stable state.

[0069] The emergency quick-release branch chain 6 is directly connected to the ratchet and pawl mechanism 3, which can open the car side door lock in the unlocked / locked state, the failure of other opening chains, or the failure of the central locking system, thus ensuring the high priority of the emergency opening branch chain of the car side door lock.

[0070] The emergency quick-release branch chain 6 is directly hinged to the pawl 302. During emergency opening, it is not affected by the pawl disc 5 and the pawl disc torsion spring 10. Compared with the main control opening, the emergency opening only needs to overcome the force of the pawl torsion spring 305, which reduces the opening force. At the same time, the main spring 605 is preloaded in the initial position and is in a tensile state, storing a certain amount of energy. Even if the force is very small, the car side door lock can be opened, ensuring that the opening action of the emergency quick-release branch chain 6 is completed smoothly.

[0071] 3. Emergency start / reset operation:

[0072] After the emergency quick-release branch chain 6 unlocks the door, the emergency release arm 601 rotates counterclockwise under the action of the operating force F2, and the main spring 605 stores energy. When the main spring 605 undergoes a sudden deformation during the mechanism's singular configuration, the energy is released and accelerated, causing the emergency release rocker arm 603 to rotate clockwise, pulling the emergency release linkage 606. The pawl 302 rotates counterclockwise under the action of the pawl torsion spring 305, thus resetting the emergency quick-release branch chain 6. As shown in Figures 10(a) to (d), the emergency release branch chain sequentially experiences four position states: emergency release reset initial position (i.e., emergency release final position) -- emergency release reset first singular configuration -- emergency release reset second singular configuration -- emergency release reset final position. Similarly, during this stage, the fourth rotating shaft 607 (miniature deep groove ball bearing 608) is always in contact with the first annular waist hole 6061. The mechanism consisting of the emergency opening rocker 603, the emergency opening connecting rod 606, the miniature deep groove ball bearing 608 and the pawl 302 is equivalent to a swing guide rod mechanism, as shown in Figure 9(f).

[0073] As shown in Figure 10(a), the emergency opening chain is in a stable state when in the initial position of emergency opening reset. When the operating force F2 is applied to the emergency opening arm 601, causing it to rotate counterclockwise around the fifth pivot 609, the emergency opening arm 601 disengages from the third limit axis 610, and its speed gradually increases from zero to the same magnitude as the pushing speed. The main spring 605 continues to stretch and deform to store energy until the first singular position of emergency opening reset is reached.

[0074] As shown in Figure 10(b), the first singular configuration of the emergency opening and reset is transient. The line of action of the main spring 605 is collinear with the emergency opening rocker 603, and points A, B, and C are collinear. The component of the main spring 605 in the direction perpendicular to the emergency opening rocker 603 is zero. When the operating force F2 continues to act, the circuit CBEF begins to move, the main spring 605 releases energy, and its potential energy is converted into the kinetic energy of each moving rod. The direction of the torque of the main spring 605 on the emergency opening rocker 603 changes, and the emergency opening rocker 603 disengages from the second limit axis 602 and accelerates counterclockwise until the second singular configuration of the emergency opening and reset is reached.

[0075] As shown in Figure 10(c), in the second singular configuration of emergency opening and reset, the line of action of the main spring 605 is collinear with the emergency opening arm 601, and points A, B, and D are collinear. The component of the main spring 605 in the direction perpendicular to the emergency opening arm 601 is zero. In the next stage, the direction of the torque of the main spring force on the emergency opening arm 601 changes. Under the action of the main spring force, the emergency opening arm 601 will be released from the action of the operating force F2, the main spring will return to its original state, and the elastic potential energy will be converted into the kinetic energy of each rod.

[0076] As shown in Figure 10(d), when the emergency opening reset is in its final position, the emergency opening arm 601 is in contact with the third limiting shaft 610, the emergency opening rocker 603 is in contact with the second limiting shaft 602, the pawl 302 is in contact with the first limiting block 303, the mechanism is in a stable state, and the emergency quick-release branch chain 6 reset action is completed.

[0077] 4. Lockout condition:

[0078] like Figure 11 As shown, in the locked state, the car door rotates around the door hinge, overcoming the elasticity of the sealing strip and fitting against the car body. Ratchet 301 strikes the locking pin, and the ratchet 301 rotates to capture the locking pin. The ratchet pawl transitions from the fully open position to the half-locked position, and then to the fully locked position. Pawl 302 stops ratchet 301 and restricts its rotation. The ratchet pawl mechanism 3 of the car side door lock sequentially goes through the following states: fully open position -- contact -- half-locked position -- fully locked position.

[0079] In the locked condition, the emergency quick-release branch 6 remains in a follow-up state throughout the entire process. The emergency opening arm 601 and emergency opening rocker 603 of the emergency quick-release branch 6 are stiffened and stationary under the preload of the main spring 605 and the action of the third limiting shaft 610 and the second limiting shaft 602. The miniature deep groove ball bearing 608 slides within the groove of the emergency opening link 606 under the rotation of the pawl 302. When the pawl 302 moves clockwise, the miniature deep groove ball bearing 608 slides upward within the groove of the emergency opening link 606, causing the emergency opening link 606 to rotate clockwise; when the pawl 302 moves counterclockwise, the miniature deep groove ball bearing 608 slides downward within the groove of the emergency opening link 606, causing the emergency opening link 606 to rotate counterclockwise. During this stage, the mechanism composed of the emergency opening link 606, the miniature deep groove ball bearing 608, and the pawl 302 is equivalent to a double rocker mechanism, as shown in Figure 8(c).

[0080] As can be seen from the above movement process, the emergency quick-release branch of the automotive side door lock based on the singular configuration of the present invention satisfies the following characteristics:

[0081] (1) Fast opening speed: The opening action should be completed in the shortest possible time to facilitate passengers to quickly exit from the side door;

[0082] (2) Small opening force: Due to the long lever arm of the opening force, the opening force is small, and different passengers can open the car side door lock. Even a small force can ensure that the emergency opening chain opening action is completed smoothly.

[0083] (3) High opening priority: The car side door lock can be opened in the locked / unlocked state, other unlocking chain failure state, central locking failure state or lock failure state;

[0084] (4) Multi-branch active and passive motion compatibility: Multiple working conditions can be achieved in a confined space, satisfying the compatibility between electric / manual opening branches and emergency opening branches.

[0085] The above embodiments are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications or variations that can be made by those skilled in the art without creative effort within the scope of the appended claims are still within the scope of protection of this patent.

Claims

1. An emergency quick-release chain for a car side door lock based on a singular configuration, characterized in that, The emergency quick-release branch (6) is connected in parallel with the main control opening branch on the door lock body; The door lock body includes a ratchet and pawl mechanism (3), wherein the ratchet (301) and pawl (302) are rotatably connected to the first rotating shaft (2) and the second rotating shaft (4) fixed on the housing (1), respectively. The ratchet (301) and pawl (302) are provided with ratchet meshing teeth (3011) and pawl meshing teeth (3023) that mesh with each other, as well as a slot for engaging the lock pin. The engagement or disengagement of the ratchet (301) and pawl (302) controls the engagement or disengagement of the lock pin in the slot between the ratchet (301) and pawl (302). The main controller opens the connection between the branch chain and the pawl (302), and controls the ratchet (301) to perform the action of releasing the locking pin; The emergency quick-release chain (6) includes an emergency opening arm (601), an emergency opening rocker (603), a main spring (605), and an emergency opening linkage (606), wherein, A planar moving and rotating composite connecting pair is provided between the left end of the emergency opening linkage (606) and the pawl (302), and its right end is rotatably connected to the left end of the emergency opening rocker (603) through the second connecting shaft (6031); the middle part of the emergency opening rocker (603) is rotatably connected to the third rotating shaft (604) fixed on the housing (1), and its right end is provided with a second rotation limiting structure that limits its rotation range; one end of the main spring (605) is fixedly connected to the second connecting shaft (6031), and the other end is fixedly connected to the first connecting shaft (6011) at the far end of the rotation center of the emergency opening arm (601); the rotation center shaft of the emergency opening arm (601) is fixedly connected to the housing (1), and a third rotation limiting structure that limits its rotation range is provided on it; a first rotation limiting structure that limits the rotation range of the pawl (302) is fixed on the housing (1).

2. The emergency quick-access branch chain for a car side door lock based on a singular configuration according to claim 1, characterized in that, Applying a clockwise rotational force (F1) to the emergency unlocking arm (601) controls the pawl (302) to release the locking pin, thereby achieving emergency unlocking; During the emergency unlocking process, the emergency quick-release chain (6) sequentially goes through five motion position states: locked position, first singular position, second singular position, ratchet and pawl disengaged position, and unlocked position; In the locked position, the center (B) of the second connecting shaft (6031) and the center (C) of the third rotating shaft (604) are located on the right and left sides of the rotating arm (AD) of the emergency opening arm (601), respectively, and the main spring (605) has a tension preload; the first rotation limiting structure, the second rotation limiting structure, and the third rotation limiting structure respectively limit the counterclockwise rotational movement degree of the pawl (302), the clockwise rotational movement degree of the emergency opening rocker (603), and the counterclockwise rotational movement degree of the emergency opening arm (601); In the first singular configuration, the line of action (AB) of the main spring (605) is collinear with the center (C) of the third rotating shaft (604); In the second singular configuration, the line of action (AB) of the main spring (605) is collinear with the lever arm (BC) of the emergency opening arm (601); In the ratchet-pawl disengaged position, the force between the ratchet (301) and the pawl (302) is zero; In the unlocked position, the lock pin is released; the center (B) of the second connecting shaft (6031) and the center (C) of the third rotating shaft (604) are located on the left and right sides of the rotating arm (AD) of the emergency opening arm (601), respectively; the second rotation limiting structure and the third rotation limiting structure respectively limit the clockwise rotational freedom of the emergency opening rocker (603) and the counterclockwise rotational freedom of the emergency opening arm (601); Between the locked position and the first singular configuration, the main spring (605) is continuously stretched; between the first singular configuration and the second singular configuration, the emergency opening lever (603) and the pawl (302) begin to move, and the main spring (605) continuously returns to its original position; between the second singular configuration and the unlocked position, the movement of the emergency opening lever (603) and the pawl (302) is no longer related to the operating force (F1), and the main spring (605) continuously returns to its original position.

3. The emergency quick-access branch chain for a car side door lock based on a singular configuration according to claim 1, characterized in that, The planar moving and rotating composite connecting pair is composed of a fourth rotating shaft (607) and a first annular waist hole (6061). The fourth rotating shaft (607) is fixed on the left ear plate of the pawl (302). The first annular waist hole (6061) is located at the left end of the emergency opening link (606). The lower end of the fourth rotating shaft (607) is nested in the first annular waist hole (6061). In the locked position, the fourth rotating shaft (607) is located at the right limit position of the first annular waist hole (6061).

4. The emergency quick-access branch chain for a car side door lock based on a singular configuration according to claim 3, characterized in that, The lower end of the fourth rotating shaft (607) is fixedly connected to a deep groove ball bearing (608), and the outer ring of the deep groove ball bearing (608) is fitted with the first annular waist hole (6061) with a small clearance.

5. The emergency quick-access branch chain for a car side door lock based on a singular configuration according to claim 1, characterized in that, The rotation center axis of the emergency opening arm (601) is fixedly connected to the housing (1) through the support plate (8). The support plate (8) is fixed on the housing (1) through the second rotating shaft (4) and the support shaft (9). The third rotation limiting structure is composed of the third limiting shaft (610) and the third annular waist hole (6012). The third annular waist hole (6012) is set on the emergency opening arm (601), and the third limiting shaft (610) is fixed on the support plate (8) and embedded in the third annular waist hole (6012). In the locked position, the third limiting shaft (610) is located at the left limit position of the third annular waist hole (6012).

6. The emergency quick-access branch chain for a car side door lock based on a singular configuration according to claim 1, characterized in that, The second rotation limiting structure consists of a second annular waist hole (6032) and a second limiting shaft (602). The second annular waist hole (6032) is opened at the right end of the emergency opening rocker (603). The second limiting shaft (602) is fixed on the housing (1) and embedded in the second annular waist hole (6032). In the locked position, the second limiting shaft (602) is located at the right limit position of the second annular waist hole (6032).

7. The emergency quick-access branch chain for a car side door lock based on a singular configuration according to claim 1, characterized in that, The first rotating shaft (2) and the second rotating shaft (4) are respectively fitted with a ratchet torsion spring (304) and a pawl torsion spring (305). One end of the two torsion springs is fixed to the housing (1), and the other end is fixed to the ratchet (301) or the pawl (302). In the locked position, the ratchet torsion spring (304) has a torsional preload that causes the ratchet (301) to rotate clockwise, and the pawl torsion spring (305) has a torsional preload that causes the pawl (302) to rotate counterclockwise.

8. The emergency quick-connection chain for a car side door lock based on a singular configuration according to claim 7, characterized in that, The pawl (302) is also provided with a limiting protrusion (3022), which cooperates with the first limiting block (303) fixed on the housing (1) to form the first rotation limiting structure.

9. An emergency quick-access branch chain for a car side door lock based on a singular configuration according to claim 3, characterized in that, The main control opening chain includes a pawl disc (5), a pawl disc torsion spring (10), and an outer opening arm (7). The outer opening arm (7) and the pawl disc (5) are rotatably connected to the second rotating shaft (4) fixed on the housing (1). The outer opening arm (7), the pawl disc (5), and the pawl (302) are connected in sequence. The pawl disc torsion spring (10) is fitted on the center of the pawl disc (5) and the second rotating shaft (4). One end is fixedly connected to the pawl disc (5), and the other end is fixedly connected to the second rotating shaft (4). During the process of actively opening the side door lock by operating the external opening arm (7), the fourth rotating shaft (607) leaves the right limit position of the first annular waist hole (6061), slides in the first annular waist hole (6061), and does not contact the left limit position of the first annular waist hole (6061).

10. An emergency quick-access branch chain for a car side door lock based on a singular configuration according to claim 9, characterized in that, The external opening arm (7) is a "Z" shaped plate with a hole on its lower horizontal plate for connection with the second rotating shaft (4) and its upper horizontal plate as the first operating handle, and a main control system connection structure is provided; the pawl disc (5) is a fan-shaped plate with a hole at its top corner for connection with the second rotating shaft (4), and an external protrusion structure at its right side corner as the second overlapping structure (51), and a downward protrusion structure at its middle edge as the third overlapping structure (52); the pawl (302) is a two-eared annular plate with an annular plate at its center, a hole for connection with the second rotating shaft (4), a tooth for meshing with the ratchet (301) on its right ear plate, and an upward protrusion structure as the fourth overlapping structure (3021) on the corresponding left ear plate on the other side; the pawl (302), the external opening arm (7), and the pawl disc (5) are arranged from bottom to top on the second rotating shaft (4).

Images