Folding locking mechanism

Abstract

The utility model discloses a turnover locking mechanism which is characterized in that two ends of a main rotating shaft are rotatably mounted on a bottom plate, a turnover piece is fixed on the main rotating shaft, a force storage torsion spring is arranged between the main rotating shaft and the bottom plate, and the force storage torsion spring has torsion for driving the main rotating shaft to rotate; the device further comprises a cam lock assembly and a pull rod assembly, the pull rod assembly is hinged to the bottom plate, a reset torsion spring is arranged between the pull rod assembly and the bottom plate and has pretightening force for driving the pull rod assembly to move, and the cam lock assembly is arranged between the main rotating shaft and the pull rod assembly. The cam lock assembly is in a locking state under the action of the torsion of the force storage torsion spring and the pre-tightening force of the reset torsion spring. And the cam lock assembly can be unlocked by pulling the pull rod assembly, so that the rotation constraint on the main rotating shaft is relieved, and the turnover of the turnover piece is further realized. The locking device has a stable locking function and an automatic resetting function, and is ingenious in structure, convenient to operate and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile seat, especially relates to a folding locking mechanism. BACKGROUND

[0002] In the field of modern mechanical design and manufacturing, folding locking mechanisms are widely used in various devices that need to realize the functions of component folding locking and unlocking, such as automobile seat adjusting mechanisms, furniture folding components, electronic device supports, etc. Such mechanisms not only can provide stable support state to ensure safety and stability during use, but also need to be convenient for user operation to realize quick and reliable unlocking and folding action. Traditional folding locking mechanisms often rely on complex mechanical linkage systems or screw rod motor driving devices to realize the functions of locking and unlocking. Although these schemes are effective, they often have problems such as complex structure and high manufacturing cost. Especially under the modern design concept of pursuing lightweight, low cost and easy assembly, the traditional mechanism is not flexible and efficient enough. SUMMARY

[0003] In view of the problems existing in the prior art, the utility model aims at providing a folding locking mechanism which adopts a clever cam lock structure design to realize convenient adjustment and stable locking of the folding piece, and has light weight and low cost.

[0004] In order to realize the above-mentioned purpose, the utility model provides a folding locking mechanism, which comprises a folding piece, a bottom plate and a main rotating shaft, both ends of the main rotating shaft are rotatably installed on the bottom plate, the folding piece is fixed on the main rotating shaft, a force storage torsional spring is arranged between the main rotating shaft and the bottom plate, the force storage torsional spring has torsion force for driving the main rotating shaft to rotate, a cam lock assembly and a pull rod assembly are further included, the pull rod assembly is hingedly connected to the bottom plate, a reset torsional spring is arranged between the pull rod assembly and the bottom plate, the reset torsional spring has pre-tightening force for driving the pull rod assembly to move, the cam lock assembly is arranged between the main rotating shaft and the pull rod assembly, and the cam lock assembly is in a locking state under the action of the torsion force of the force storage torsional spring and the pre-tightening force of the reset torsional spring; pulling the pull rod assembly can realize unlocking of the cam lock assembly, so as to release the rotation constraint of the main rotating shaft, and then realize folding of the folding piece.

[0005] In the above-mentioned scheme, the cam lock assembly comprises a cam piece and a locking piece, the cam piece is fixed on the main rotating shaft, the locking piece is hingedly connected to the bottom plate through a locking piece first rotating shaft, and one end away from the locking piece first rotating shaft is connected with the pull rod assembly, and the locking piece and the cam piece are engaged together under the action of the torsion force of the force storage torsional spring and the pre-tightening force of the reset torsional spring; pulling the pull rod assembly can drive the locking piece to rotate around the locking piece first rotating shaft, so as to realize separation of the cam piece and the locking piece, and make the cam lock assembly unlock.

[0006] In the above scheme: the power spring has a driving main shaft to the rear rotation torque, the reset torsion spring has a driving pull rod assembly to the upper movement of the pre-tightening force, pull the pull rod assembly, can realize the unlocking of the cam lock assembly, thereby removing the rotation constraint of the main shaft, and then realizing the rear folding of the folding piece.

[0007] In the above scheme: the cam lock assembly further comprises a housing, the cam piece and the locking piece are arranged inside the housing, the housing is fixed on the bottom plate, the housing is provided with a shaft hole for the main shaft to pass through, the front end of the locking piece is hinged to the housing through the first shaft of the locking piece, the rear end is provided with a groove upwardly engaged with the protrusion arranged on the cam piece, and the rear end is further movably sleeved with the second shaft of the locking piece extending left and right, the housing is provided with a first guide groove at both ends for the second shaft of the locking piece to pass outwards, and the second shaft of the locking piece is limited in the first guide groove; when the locking piece is turned downward around the first shaft of the locking piece, the second shaft of the locking piece can slide along the first guide groove.

[0008] In the above scheme: the pull rod assembly comprises a U-shaped pull rod, a ball pull rod and a main pull rod, the second shaft of the locking piece is fixed between the two ends of the U-shaped pull rod, the upper end of the ball pull rod is fixed to the bottom end of the U-shaped pull rod, the lower end of the ball pull rod is a ball head end, the ball head end is connected to the left end of the main pull rod, the bottom plate is fixed with a reset torsion spring shaft, a torsion spring limiting shaft and a pull rod limiting bolt, the middle part of the main pull rod is hinged to the bottom plate through the reset torsion spring shaft and is prevented from falling off through the pull rod fixing bolt, the reset torsion spring is sleeved on the reset torsion spring shaft, one end of the reset torsion spring is connected to the main pull rod, and the other end of the reset torsion spring abuts against the torsion spring limiting shaft, the right end of the main pull rod is provided with a second guide groove for the pull rod limiting bolt to pass through, and the pull rod limiting bolt is limited in the second guide groove; when the main pull rod rotates around the reset torsion spring shaft, the pull rod limiting bolt can slide along the second guide groove.

[0009] In the above scheme: the right end of the main pull rod is equipped with a manual driving mechanism and / or an electric driving mechanism, the manual driving mechanism or the electric driving mechanism can drive the main pull rod to rotate clockwise, thereby driving the ball pull rod and the U-shaped pull rod to move downward, and then realizing the separation of the cam piece and the locking piece, so that the cam lock assembly is unlocked.

[0010] In the above scheme: the manual driving mechanism comprises a pull belt, the pull belt is connected to the right end of the main pull rod, and upward pulling of the pull belt can drive the main pull rod to rotate clockwise, thereby driving the ball pull rod and the U-shaped pull rod to move downward, and then realizing the separation of the cam piece and the locking piece, so that the cam lock assembly is unlocked.

[0011] In the scheme, the electric drive mechanism comprises a cable motor, a cable, a cable fixing support and a top rod, the top rod is horizontally arranged below the main pull rod, the top surface of the top rod is in contact with the bottom surface of the main pull rod, the middle part of the top rod is hinged to the bottom plate through a top rod rotating shaft, the cable fixing support is fixed to the bottom plate, the cable is fixed to the cable fixing support through a protective tube, the upper end of the cable is connected with the left end of the top rod, and the lower end of the cable is connected with the cable motor; the cable motor can drive the cable to pull down, the top rod can drive the main pull rod to rotate clockwise, the ball pull rod and the U-shaped pull rod are driven to move downwards, the cam piece is separated from the locking piece, and the cam lock assembly is unlocked.

[0012] In the scheme, the force storage torsion spring is sleeved on the main rotating shaft, one end of the force storage torsion spring is inserted into the folding piece, and the other end of the force storage torsion spring is hooked on the bottom plate.

[0013] In the scheme, the left end of the main pull rod is provided with a ball head clamping groove for clamping the ball head end of the ball pull rod, the back surface of the main pull rod is further provided with a cavity for accommodating the reset torsion spring and a torsion spring clamping groove for clamping the corresponding end of the reset torsion spring.

[0014] The utility model discloses the beneficial effect is:

[0015] 1, through the main rotating shaft links the folding piece with the bottom plate, and ingeniously utilizes the force storage torsion spring to provide the driving force of rotation for the main rotating shaft, and this design simplifies the power source of folding piece folding. Meanwhile, the hinge design between the pull rod assembly and the bottom plate and the introduction of the reset torsion spring provide convenience for the unlocking operation of the mechanism and ensure the natural reset of the pull rod assembly when not subjected to external force.2, the cam lock assembly realizes the rotation locking of the main rotating shaft through the torsion of the force storage torsion spring and the pre-tightening force of the reset torsion spring, and further ensures the locking of the folding piece.3, in actual operation, the user only needs to simply pull the pull rod assembly to realize the unlocking of the cam lock assembly, and further release the rotation constraint of the main rotating shaft, which is simple and convenient to operate and greatly improves the user's experience.4, the ingenious cam lock structure design makes the folding angle of the folding piece large (the folding angle is greater than 90°), and the folding piece can still be locked. In short, the utility model has stable locking function and automatic reset function, and the structure is ingenious, convenient to operate and low in production cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0017] Figure 1 It is the assembly schematic view of the utility model on the backrest assembly.

[0018] Figure 2 It is the structure schematic view of the utility model.

[0019] Figure 3 is a schematic diagram of explosion.

[0020] Figure 4 is a schematic diagram of the pull rod assembly.

[0021] Figure 5 is a schematic diagram of the pull rod assembly from another angle.

[0022] Figure 6 is a schematic diagram of the assembly of the main shaft.

[0023] Figure 7 is a schematic diagram of the connection between the cam lock assembly and the pull rod assembly.

[0024] Figure 8 is a schematic diagram of the manual unlocking principle.

[0025] Figure 9 is a schematic diagram of the electric unlocking principle.

[0026] Figure 10 is a schematic diagram of the latching principle.

[0027] Figure 11 is a force analysis diagram of the cam lock assembly. DETAILED DESCRIPTION

[0028] As shown in Figure 1 -11, a folding locking mechanism mainly consists of a folding piece 2, a bottom plate 3, a main shaft 4, a cam lock assembly B, and a pull rod assembly C. The headrest rear folding mechanism A can be assembled on the backrest assembly 1 of the car seat to realize the folding of the headrest. In this application, the folding piece 2 is a headrest rod, the bottom plate 3 is a backrest bottom plate, the main shaft 4 is a headrest main shaft,

[0029] The two ends of the headrest main shaft are rotatably installed on the backrest bottom plate, the headrest rod is fixed on the headrest main shaft, and a force storage torsional spring 7 is arranged between the headrest main shaft and the backrest bottom plate. The force storage torsional spring 7 has a torsional force to drive the headrest main shaft to rotate rearward.

[0030] The pull rod assembly C is hingedly connected to the backrest bottom plate, a reset torsional spring 8 is arranged between the pull rod assembly C and the backrest bottom plate, the reset torsional spring 8 has a pre-tightening force to drive the pull rod assembly C to move upward, and the cam lock assembly B is arranged between the headrest main shaft and the pull rod assembly C. The cam lock assembly B is in a latching state under the action of the torsional force of the force storage torsional spring 7 and the pre-tightening force of the reset torsional spring 8.

[0031] Pulling the pull rod assembly C can realize the unlocking of the cam lock assembly B, thereby releasing the rotational constraint of the headrest main shaft, and further realizing the rear folding of the headrest rod. In addition, in order to prevent the speed from being too fast when the headrest is folded, the folding locking mechanism is equipped with a damping mechanism.

[0032] The cam lock assembly B comprises a cam piece 9, a locking piece 10 and a housing 11, the cam piece 9 and the locking piece 10 are arranged inside the housing 11 and are engaged together under the torsion of the force storing torsion spring 7 and the pre-tightening force of the reset torsion spring 8. The housing 11 is fixed on the backrest bottom plate, the housing 11 is provided with a pivot hole through which the headrest main pivot is movably arranged, and the cam piece 9 is fixed on the headrest main pivot. The front end of the locking piece 10 is hinged to the housing 11 through a locking piece first pivot 12, the rear end is provided with a recess which is engaged with a protrusion arranged on the cam piece 9, and the rear end is movably sleeved with a left and right extending locking piece second pivot 13. The housing 11 is provided with a first guide groove 14 through which the locking piece second pivot 13 is outwardly arranged, and the locking piece second pivot 13 is limited in the first guide groove 14; when the locking piece 10 is turned downward around the locking piece first pivot 12, the locking piece second pivot 13 can slide along the first guide groove 14.

[0033] The cam lock assembly B realizes the locking and unlocking functions of the headrest main pivot through the ingenious combination of the cam piece 9, the locking piece 10 and the housing 11. The overall structure design is exquisite, the cooperation between the components is tight, and the backrest space is effectively utilized. Under the torsion of the force storing torsion spring 7 and the pre-tightening force of the reset torsion spring 8, the cam piece 9 and the locking piece 10 are engaged together, which ensures the stability of the headrest main pivot in the locked state. The design of the first guide groove 14 enables the locking piece 11 to move smoothly during the unlocking process and maintains good guidance. This design enhances the adaptability and reliability of the mechanism, ensuring stable operation under various use conditions.

[0034] The pull rod assembly C comprises a U-shaped pull rod 15, a ball pull rod 16 and a main pull rod 17. The locking piece second pivot 13 is fixed between the two ends of the U-shaped pull rod 15, the upper end of the ball pull rod 16 is fixed to the bottom end of the U-shaped pull rod 15, and the lower end of the ball pull rod 16 is a ball head end which is connected to the left end of the main pull rod 17. The reset torsion spring pivot 18, the torsion spring limiting shaft 19 and the pull rod limiting bolt 20 are fixed on the backrest bottom plate. The middle part of the main pull rod 17 is hinged to the backrest bottom plate through the reset torsion spring pivot 18 and is prevented from being detached by the pull rod fixing bolt 21. The reset torsion spring 8 is sleeved on the reset torsion spring pivot 18, one end of which is connected to the main pull rod 17 and the other end abuts against the torsion spring limiting shaft 19. The right end of the main pull rod 17 is provided with a second guide groove 22 through which the pull rod limiting bolt 20 passes, and the pull rod limiting bolt 20 is limited in the second guide groove 22; when the main pull rod 17 rotates around the reset torsion spring pivot 18, the pull rod limiting bolt 20 can slide along the second guide groove 22.

[0035] The pull rod assembly C realizes the unlocking function of the cam lock assembly C through the ingenious combination of the U-shaped pull rod 15, the ball pull rod 16 and the main pull rod 17, and integrates the driving mechanism of the reset torsion spring 8. This design makes the whole mechanism more compact and reduces the space occupation. The user only needs to pull the main pull rod 17 to drive the U-shaped pull rod 15 and the ball pull rod 16 to move, and then make the second rotating shaft 13 of the locking piece rotate to realize the unlocking of the cam lock assembly B. This process is simple and easy to operate, and has strong user friendliness.

[0036] The right end of the main pull rod 17 is equipped with a manual driving mechanism and / or an electric driving mechanism, which can drive the main pull rod 17 to rotate clockwise, thereby driving the ball pull rod 16 and the U-shaped pull rod 15 to move downward, and then realizing the separation of the cam piece 9 and the locking piece 10, so that the cam lock assembly B is unlocked. Both manual and electric unlocking can be independent, and the manual and electric integrated unlocking has good compatibility.

[0037] Preferably, the manual driving mechanism includes a pull belt 23 connected to the right end of the main pull rod 17. Pulling the pull belt 23 upward can drive the main pull rod 17 to rotate clockwise, thereby driving the ball pull rod 16 and the U-shaped pull rod 15 to move downward, and then realizing the separation of the cam piece 9 and the locking piece 10, so that the cam lock assembly B is unlocked. The pull belt 23 has low cost and simple and direct operation mode, which greatly improves the convenience of unlocking.

[0038] Preferably, the electric driving mechanism includes a cable motor 24, a cable 25, a cable fixing bracket 26 and a top rod 27. The top rod 27 is horizontally arranged below the main pull rod 17, the top surface of the top rod 27 is in contact with the bottom surface of the main pull rod 17, and the middle part of the top rod 27 is hinged to the backrest bottom plate through a top rod rotating shaft. The cable fixing bracket 26 is fixed to the backrest bottom plate, the cable 25 is fixed to the cable fixing bracket 26 through a protective tube, the upper end of the cable 25 is connected to the left end of the top rod 24, and the lower end of the cable 24 is connected to the cable motor 27. The cable motor 27 can drive the cable 25 to pull down, and the cable 25 can drive the top rod 24 to push the main pull rod 17 to rotate clockwise, thereby driving the ball pull rod 16 and the U-shaped pull rod 15 to move downward, and then realizing the separation of the cam piece 9 and the locking piece 10, so that the cam lock assembly B is unlocked. Through the ingenious combination of the cable motor 27, the cable 25, the cable fixing bracket 26 and the top rod 25, the electric unlocking of the cam lock assembly B is realized, and the electric driving mechanism has the characteristics of compact structure, high efficiency, smooth and reliable.

[0039] Preferably, the headrest rod is fixed to the headrest main rotating shaft through the headrest sleeve 5, and the energy storage torsion spring 7 is sleeved on the headrest main rotating shaft, one end of the energy storage torsion spring 7 is inserted into the headrest sleeve 5, and the other end is hooked on the backrest bottom plate. The energy storage torsion spring 7 is in a compressed energy storage state due to installation, and the upper cam piece 9 generates a pre-tightening torque T1 due to the compression and energy storage of the energy storage torsion spring. T1 makes the cam piece 9 generate a normal pressure Fn on the locking piece 10.

[0040] Pre-tightening torque T1 generation principle:

[0041] The angle between the two ends of the free-state energy storage torsion spring 7 is 0°. After assembly, one end of the lead is limited by the mounting hole of the back plate, and the other end of the lead is limited in the mounting hole of the headrest sleeve 5 after being twisted at a certain angle. The energy storage torsion spring 7 is in a compressed energy storage state due to installation. The headrest main shaft is fixedly connected with the headrest sleeve 5 and the cam piece 9, and is rotatably connected with the back plate through the stepped bolt shaft 6. The cam piece 9 on it generates a pre-tightening torque T1 due to the compression energy storage of the energy storage torsion spring 7.

[0042] Preferably, the left end of the main pull rod 17 is provided with a ball head clamping groove for clamping the ball head end of the ball pull rod 16, and the back surface is further provided with a cavity for accommodating the reset torsion spring 8 and a torsion spring clamping groove for clamping the corresponding end of the reset torsion spring 8. The reset torsion spring 8 is in a compressed energy storage state due to installation, so the main pull rod 17 always has a clockwise rotation trend around the reset torsion spring shaft 18, thereby lifting the ball pull rod 16 to have an upward movement trend, i.e. generating a pre-tightening force F2.

[0043] Pre-tightening force F2 generation principle:

[0044] The angle between the two ends of the free-state reset torsion spring 8 is 0°. After assembly, one end of the lead is twisted at a certain angle in the clockwise direction and is limited on the left side of the torsion spring limiting shaft 19. The other end of the lead is installed in the torsion spring clamping groove of the pull rod. The reset torsion spring 8 is in a compressed energy storage state due to installation. The main pull rod 17 always has a clockwise rotation trend around the reset torsion spring shaft 18, thereby lifting the ball pull rod 13 to have an upward movement trend, i.e. generating a pre-tightening force F2.

[0045] Preferably, the protrusion of the cam piece 9 and the groove of the locking piece 10 have two cutting points P2 in front and back, and the locking piece 10 is hinged to the housing 11 to form a rotation point P1. When the headrest is abused backward, the normal direction of the tangent line of the rear cutting point P2 (i.e. the direction of Fn at this time) is located below the line connecting the cutting point P2 and the rotation point P1, and there is an included angle a between them. When the headrest is abused forward, the normal direction of the tangent line of the front cutting point P2 (i.e. the direction of Fn at this time) is located above the line connecting the cutting point P2 and the rotation point P1, and there is an included angle a between them. The protrusion of the cam piece 9 cannot escape from the groove of the locking piece 10, ensuring that the cam piece 9 cannot escape from the locking piece 10 when the headrest is abused forward and backward, i.e. adopting a unique engagement principle design, so that the headrest can meet the strength requirements of the headrest during vehicle collision after being locked, and far exceeds the standard strength value.

Claims

1. A folding locking mechanism, comprising a folding piece (2), a base plate (3) and a main rotating shaft (4), both ends of the main rotating shaft (4) are rotatably installed on the base plate (3), the folding piece (2) is fixed on the main rotating shaft (4), a force storage torsional spring (7) is arranged between the main rotating shaft (4) and the base plate (3), the force storage torsional spring (7) has a torsional force to drive the main rotating shaft (4) to rotate; characterized in that: The cam lock assembly (B) and the pull rod assembly (C) are further included, the pull rod assembly (C) is hinged on the bottom plate (3), the reset torsion spring (8) is arranged between the pull rod assembly (C) and the bottom plate (3), the reset torsion spring (8) has a pre-tightening force for driving the pull rod assembly (C) to move, the cam lock assembly (B) is arranged between the main rotating shaft (4) and the pull rod assembly (C), and the cam lock assembly (B) is in a locked state under the torsion of the force storage torsion spring (7) and the pre-tightening force of the reset torsion spring (8); the pull rod assembly (C) is pulled, the cam lock assembly (B) is unlocked, the rotation of the main rotating shaft (4) is released, and then the folding piece (2) is folded. ​ 2. The fold lock mechanism according to claim 1, wherein: The cam lock assembly (B) includes a cam piece (9) and a locking piece (10), the cam piece (9) is fixed on the main rotating shaft (4), the locking piece (10) is hinged on the bottom plate (3) through a locking piece first rotating shaft (12), and one end away from the locking piece first rotating shaft (12) is connected with the pull rod assembly (C), and the locking piece (10) and the cam piece (9) are engaged together under the torsion of the force storage torsion spring (7) and the pre-tightening force of the reset torsion spring (8); the pull rod assembly (C) is pulled, the locking piece (10) is driven to rotate around the locking piece first rotating shaft (12), the cam piece (9) and the locking piece (10) are separated, and the cam lock assembly (B) is unlocked.

3. The fold lock mechanism according to claim 2, wherein: The force storage torsion spring (7) has a torsion force for driving the main rotating shaft (4) to rotate backward, the reset torsion spring (8) has a pre-tightening force for driving the pull rod assembly (C) to move upward, the pull rod assembly (C) is pulled, the cam lock assembly (B) is unlocked, the rotation of the main rotating shaft (4) is released, and then the folding piece (2) is folded backward.

4. The fold lock mechanism according to claim 3, wherein: The cam lock assembly (B) further includes a housing (11), the cam piece (9) and the locking piece (10) are arranged in the housing (11), the housing (11) is fixed on the bottom plate (3), a rotating shaft hole is arranged on the housing (11) and used for allowing the main rotating shaft (4) to move through, the front end of the locking piece (10) is hinged on the housing (11) through the locking piece first rotating shaft (12), the rear end is provided with a recess and engages with a protrusion arranged on the cam piece (9) upward, and the rear end further movably sleeves with a left-right extending locking piece second rotating shaft (13), first guide grooves (14) are arranged at both ends of the housing (11) and used for allowing the locking piece second rotating shaft (13) to move out, and the locking piece second rotating shaft (13) is limited in the first guide groove (14); when the locking piece (10) is flipped downward around the locking piece first rotating shaft (12), the locking piece second rotating shaft (13) can slide along the first guide groove (14).

5. The fold lock mechanism according to claim 4, wherein: The pull rod assembly (C) comprises a U-shaped pull rod (15), a ball pull rod (16) and a main pull rod (17), the second rotation shaft (13) of the locking piece is fixed between the two ends of the U-shaped pull rod (15), the upper end of the ball pull rod (16) is fixed to the bottom end of the U-shaped pull rod (15), the lower end of the ball pull rod (16) is a ball head end, the ball head end is connected to the left end of the main pull rod (17), the bottom plate (3) is provided with a reset torsion spring shaft (18), a torsion spring limiting shaft (19) and a pull rod limiting bolt (20), the middle part of the main pull rod (17) is hinged to the bottom plate (3) through the reset torsion spring shaft (18) and is prevented from being detached through the pull rod fixing bolt (21), the reset torsion spring (8) is sleeved on the reset torsion spring shaft (18), one end of the reset torsion spring (8) is connected to the main pull rod (17), and the other end of the reset torsion spring (8) abuts against the torsion spring limiting shaft (19), the right end of the main pull rod (17) is provided with a second guide groove (22) through which the pull rod limiting bolt (20) passes, and the pull rod limiting bolt (20) is limited in the second guide groove (22); when the main pull rod (17) rotates around the reset torsion spring shaft (18), the pull rod limiting bolt (20) can slide along the second guide groove (22).

6. The fold lock mechanism according to claim 5, wherein: The right end of the main pull rod (17) is provided with a manual driving mechanism and / or an electric driving mechanism, the manual driving mechanism or the electric driving mechanism can drive the main pull rod (17) to rotate clockwise, thereby driving the ball pull rod (16) and the U-shaped pull rod (15) to move downward, and further realizing the separation of the cam piece (9) and the locking piece (10), so that the cam lock assembly (B) is unlocked.

7. The fold lock mechanism according to claim 6, wherein: The manual driving mechanism comprises a pull belt (23), the pull belt (23) is connected to the right end of the main pull rod (17), and upward pulling of the pull belt (23) can drive the main pull rod (17) to rotate clockwise, thereby driving the ball pull rod (16) and the U-shaped pull rod (15) to move downward, and further realizing the separation of the cam piece (9) and the locking piece (10), so that the cam lock assembly (B) is unlocked.

8. The fold lock mechanism according to claim 6, wherein: The electric driving mechanism comprises a cable motor (24), a cable (25), a cable fixing support (26) and a top rod (27), the top rod (27) is transversely arranged below the main pull rod (17), the top surface of the top rod (27) is in contact with the bottom surface of the main pull rod (17), the middle part of the top rod (27) is hinged to the bottom plate (3) through a top rod rotation shaft, the cable fixing support (26) is fixed to the bottom plate (3), the cable (25) is fixed to the cable fixing support (26) through a protective tube, the upper end of the cable (25) is connected to the left end of the top rod (24), the lower end of the cable (24) is connected to the cable motor (27), the cable motor (27) can drive the cable (25) to pull down when working, the cable (25) pulling down can drive the top rod (24) to push the main pull rod (17) to rotate clockwise, thereby driving the ball pull rod (16) and the U-shaped pull rod (15) to move downward, and further realizing the separation of the cam piece (9) and the locking piece (10), so that the cam lock assembly (B) is unlocked.

9. The fold lock mechanism according to claim 1, wherein: The energy storage torsion spring (7) is sleeved on the main rotation shaft (4), one end of the energy storage torsion spring (7) is inserted into the folding piece (2), and the other end of the energy storage torsion spring (7) is hooked on the bottom plate (3).

10. The fold lock mechanism according to claim 5, wherein: The left end of the main pull rod (17) is provided with a ball head slot for clamping the ball head end of the ball pull rod (16), and the back thereof is further provided with a cavity for accommodating the reset torsion spring (8) and a torsion spring clamping slot for clamping the corresponding end of the reset torsion spring (8).

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