Cam forced reset structure

Abstract

The present invention discloses a cam forced reset structure, comprising a base, a handle body, and a driving cam. The handle body can move between a retracted state and an extended state relative to the base. A push rod is slidably provided on the base. The handle body and the push rod are connected by a swing arm. The push rod includes a driving portion. A roller is rotatably provided at the end of the driving portion. The roller fits against and rolls with the outer wall of the driving cam. A track rib extends from the edge of the driving cam. The track rib includes a spiral guide segment with a gradually varying radius. The curvature radius of the spiral guide segment gradually increases from the proximal end to the distal end of the driving cam. A guide post is provided on the side of the driving portion facing the driving cam. The guide post slides in a guiding manner with the inner wall of the track rib. This allows the present invention to achieve the purpose of forced switching of the handle body between the retracted state and the extended state by rotating the driving cam forward and backward. At the same time, it has the effect of preventing the driving cam and the push rod from getting stuck, thereby extending the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile door handles, and in particular to a cam forced reset structure. Background Art

[0002] The existing Chinese patent with the announcement number CN210217430U discloses a hidden car exterior door handle structure, the handle includes a handle body, and the handle body has a first mounting portion and a second mounting portion on both sides. The actuating device also includes a shell, an actuating rod is hinged on the shell, and the front end of the actuating rod is hinged with the first mounting portion of the handle. A push rod is slidably provided on the shell, and an unlocking rod is slidably connected to the shell. The head of the push rod is in surface contact with the tail of the unlocking rod, and the front end of the unlocking rod is hinged with the second mounting portion of the handle. The shell has a The guide structure for guiding, the actuating device also includes a driving mechanism for pushing the push rod to slide and pushing the actuating rod to swing, a lock ring is hinged on the car door, and the unlocking rod is provided with a mating part that cooperates with the lock ring to drive the lock ring to rotate, and the lock ring is connected to the unlocking pull lock of the car door; the actuating device also includes a reset structure for resetting the lock ring, the unlocking rod, the push rod and the actuating rod, and the reset structure includes a first torsion spring and a second torsion spring; the driving mechanism includes a motor and a push block extending or retracting from the motor, the push block pushes the push rod to slide, and at the same time the push block pushes the actuating rod to swing.

[0003] However, the above-mentioned door handle has the following disadvantages: the door handle directly pushes the push rod to slide through the push block at the output end of the motor, so that the push rod pushes the actuating rod and the unlocking rod to rotate in the unlocking direction of the door handle, thereby pushing the handle out of the shell, but its push block can only push the push rod to move in the unlocking direction, and the reset of the push rod is achieved by the first torsion spring and the second torsion spring. After long-term use, the elastic force of the first torsion spring and the second torsion spring will be reduced due to rust and aging, resulting in the handle being unable to be completely reset. Improvement is urgent. Summary of the Invention

[0004] The purpose of the present invention is to provide a cam forced reset structure, so that the present invention can achieve the purpose of forced switching of the handle body between the storage state and the extended state by driving the cam in the forward and reverse rotation, and at the same time has the effect of preventing the driving cam and the push rod from getting stuck and extending the service life.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a cam forced reset structure, comprising a base and a handle body, the handle body being movable relative to the base between a retracted state and an extended state, a push rod being slidably provided on the base, the handle body and the push rod being connected by a plurality of swing arms, and further comprising a driving cam, the push rod comprising a driving portion close to one side of the driving cam, a roller being rotatably provided at the end of the driving portion, the roller being in contact with the outer wall of the driving cam and rollingly engaged therewith, and the rotation planes of the driving cam and the roller being parallel to each other;

[0006] A track rib extends from the edge of the driving cam, and the track rib includes a spiral guide segment with a gradual radius, and the curvature radius of the spiral guide segment gradually increases from the proximal end to the distal end of the driving cam; a guide column is provided on the side of the driving part facing the driving cam, and the guide column is in sliding cooperation with the inner wall guide of the track rib.

[0007] By adopting the above technical solution, when the handle body is in the storage state, the roller is located at the proximal end of the driving cam, and the driving cam is controlled to rotate at this time, and the guide column slides along the arc surface of the inner wall of the spiral guide section. During this process, the roller of the driving part always rolls along the outer wall of the inner concave portion of the driving cam, so that the guide column moves from the proximal end to the distal end of the driving cam along the track rib, thereby driving the push rod to move on the base toward the unlocking direction of the handle body, and the push rod then drives the handle body to the extended state through the swing arm; when the handle body is in the extended state, the roller is located at the distal end of the driving cam, and the driving cam is controlled to rotate in the opposite direction at this time, and the roller rolls along the outer wall of the outer convex portion of the driving cam, so that the guide column moves from the distal end to the proximal end of the driving cam along the arc surface of the inner wall of the spiral guide section, thereby driving the push rod to perform a reset movement, and the push rod then drives the handle body to the storage state through the swing arm. The present invention utilizes the guiding traction force between the guide column and the inner wall of the spiral guide section, and the rolling force between the roller and the outer wall of the driving cam. The combined force of the two drives the push rod to move, so that the push rod can drive the handle body to telescope and switch between the storage state and the extended state through the swing arm. In addition, the present invention avoids the situation where the driving cam and the push rod guide cooperate by arranging a roller at the end of the push rod to roll with the outer wall of the driving cam, thereby improving the smoothness of the switching of the handle body of the present invention between the storage state and the extended state, extending the service life of the present invention, and enabling the present invention to achieve the purpose of forced switching of the handle body between the storage state and the extended state by the forward and reverse rotation of the driving cam, while having the effect of not easily getting stuck between the driving cam and the push rod, thereby extending the service life.

[0008] The present invention is further configured as follows: the track rib includes a spiral starting segment connected to the spiral guide segment, the spiral starting segment is arranged close to the proximal end of the driving cam, and the curvature of the spiral starting segment is greater than the curvature of the spiral guide segment.

[0009] By adopting the above technical solution, the torque generated by the spiral starting section is larger than that of the spiral guide section, which improves the driving force of the handle body in the early stage of the extension process, which is conducive to the smooth extension of the handle body. At the same time, it can also reduce the return rate of the handle body in the final stage of storage and retraction, ensuring that the handle body can be accurately reset to the storage position.

[0010] The present invention is further configured as follows: the track rib includes an arcuate anti-slip segment connected to the spiral guide segment, and the arcuate anti-slip segment is arranged close to the distal end of the driving cam.

[0011] By adopting the above technical solution, when the handle body is in the extended state, the guide column is located at the distal end of the driving cam. At this time, the arc-shaped anti-slip section serves the purpose of preventing slippage, and can effectively avoid the situation where the track ribs of the guide column and the driving cam are separated from each other and the cooperation fails due to excessive rotation of the driving cam.

[0012] The present invention is further configured as follows: a stop surface is provided on the side wall of the driving cam, and when the handle body moves to the storage state, the driving cam is limited and stopped by the stop surface and the side wall of the push rod.

[0013] The present invention is further configured as follows: a side of the driving cam close to the stop surface is provided with an escape groove, and when the handle body moves to the storage state, the roller is in escape cooperation with the escape groove.

[0014] By adopting the above technical solution, it is possible to prevent the roller at the end of the push rod from colliding with the driving cam during the transmission process, thereby preventing the components from being damaged or stuck.

[0015] The present invention is further configured as follows: the driving portion is provided with a mounting opening corresponding to the roller, and the roller is rotatably connected to the mounting opening via a pin shaft.

[0016] By adopting the above technical solution and arranging the roller in the installation opening, the space occupied by the push rod on which the roller is installed on the base can be reduced.

[0017] The present invention is further configured as follows: it also includes a driving device, which includes a mounting housing and a motor, a worm and a worm wheel built into the mounting housing, the worm is engaged with the worm wheel, the worm is connected to the output shaft of the motor, the rotation center of the driving cam is provided with a rotating drive shaft, and the worm wheel is coaxially fixedly connected to the rotating drive shaft.

[0018] By adopting the above technical solution, the rotation of the motor drives the worm to rotate, and the worm wheel drives the driving cam to rotate by rotating the driving shaft. The meshing transmission mode of the worm wheel and the worm has a large transmission ratio, a compact structure and a smooth transmission effect.

[0019] The present invention is further configured as follows: an angle limiting structure is provided between the mounting shell and the driving cam, and when the driving cam rotates and drives the handle body to move to an extended state or a retracted state, the driving cam cooperates with the mounting shell to prevent rotation through the angle limiting structure.

[0020] By adopting the above technical solution, the angle limiting structure can constrain the rotation angle of the driving cam, thereby preventing the driving cam from excessively rotating and causing a failure in the fit.

[0021] The present invention is further configured such that: the angle limiting structure includes a limiting protrusion and a stop block, the limiting protrusion is provided on a side of the driving cam away from the track rib, the stop block is provided on the mounting housing, and the stop block includes a first end surface facing the proximal end of the driving cam and a second end surface facing the distal end of the driving cam;

[0022] When the handle body moves to the extended state, the limiting protrusion is engaged with the first end surface of the stop block;

[0023] When the handle body moves to the storage state, the limiting protrusion is engaged with the second end surface of the stop block.

[0024] The present invention is further configured as follows: the base is provided with a sliding groove along the length direction, the push rod is slidably arranged in the sliding groove, the base is provided with track grooves on both side walls of the sliding groove, the track grooves are connected to the sliding grooves, and sliders are provided on both sides of the push rod corresponding to the track grooves, and the sliders are guided and slidably matched with the track grooves.

[0025] By adopting the above technical solution, the push rod is constrained by the slide groove so that the push rod can only move horizontally along the slide groove in the length direction of the base, which can improve the consistency of the sliding direction of the push rod relative to the base. At the same time, the guiding effect of the track groove and the slider can be used to prevent the push rod from detaching from the base.

[0026] In summary, the present invention has the following beneficial effects:

[0027] A push rod is slidingly arranged on the base, and the push rod is connected to the handle body through a swing arm. A driving device is provided on the base, and a driving cam is provided at the output end of the driving device. The push rod includes a driving part close to the driving cam, and a roller is rotatably provided at the end of the driving part, and a guide column is provided on the side of the driving part facing the driving cam, wherein the roller fits the outer wall of the driving cam and rolls with it, and a track rib extends from the edge of the driving cam, and the track rib includes a spiral guide section with a gradual radius, and the curvature radius of the spiral guide section gradually increases from the proximal end to the distal end of the driving cam, and the guide column slides in conjunction with the inner wall guide of the track rib. The present invention utilizes the guiding traction force between the guide column and the inner wall of the spiral guide section, and the rolling force between the roller and the outer wall of the driving cam. The combined force of the two drives the push rod to move, so that the push rod can drive the handle body to telescope and switch between the storage state and the extended state through the swing arm. In addition, the present invention avoids the situation where the driving cam and the push rod guide cooperate by arranging a roller at the end of the push rod to roll with the outer wall of the driving cam, thereby improving the smoothness of the switching of the handle body of the present invention between the storage state and the extended state, extending the service life of the present invention, and enabling the present invention to achieve the purpose of forced switching of the handle body between the storage state and the extended state by the forward and reverse rotation of the driving cam, while having the effect of not easily getting stuck between the driving cam and the push rod, thereby extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall structural diagram of the present invention, with the handle body in a retracted state.

[0029] Figure 2 It is an overall structural diagram of the present invention, with the handle body in an extended state.

[0030] Figure 3 This invention Figure 1 A view from another perspective.

[0031] Figure 4 This invention Figure 3 A partial enlarged view of area A in the middle.

[0032] Figure 5 It is an exploded view of the present invention.

[0033] Figure 6 This is a partial view of the guide post of the present invention sliding to the proximal end position of the driving cam, and the handle body is in the storage state.

[0034] Figure 7 This invention Figure 6 A partial view from another perspective.

[0035] Figure 8 This invention Figure 7 Exploded diagram.

[0036] Figure 9 This is a partial view of the guide post of the present invention sliding to the distal end position of the driving cam, and the handle body is in an extended state.

[0037] Figure 10 It is a structural diagram of the driving cam of the present invention.

[0038] Figure 11 It is a top view of the driving cam of the present invention.

[0039] In the figure: 1. Base; 11. Slide groove; 12. Track groove; 13. Arc guide groove; 2. Handle body; 3. Push rod; 31. Drive unit; 310. Mounting port; 311. Roller; 312. Guide post; 32. Slider; 321. Guide rib; 4. Swing arm; 41. First swing arm; 411. Return torsion spring; 42. Second swing arm; 421. Return spring; 5. Drive cam; 501. Proximal end ; 502, distal end; 51, track rib; 511, spiral guide section; 512, spiral starting section; 513, arc-shaped anti-slip section; 52, stop surface; 53, avoidance groove; 54, rotating drive shaft; 55, limiting protrusion; 6, driving device; 61, mounting shell; 611, stop block; 6111, first end face; 6112, second end face; 62, motor; 63, worm; 64, worm wheel. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the accompanying drawings.

[0041] Cam forced reset structure, such as Figure 1-Figure 5 and Figure 11As shown, it includes a base 1 and a handle body 2, the handle body 2 can move between a storage state and an extended state relative to the base 1, a push rod 3 is slidably provided on the base 1, the handle body 2 and the push rod 3 are connected by a number of swing arms 4, and also includes a driving cam 5, the driving cam 5 includes an outer convex portion and an inner concave portion, the push rod 3 includes a driving portion 31 close to the side of the driving cam 5, the end of the driving portion 31 is rotatably provided with a roller 311, the roller 311 is attached to the outer wall of the driving cam 5 and rolls with it, and the rotation planes of the driving cam 5 and the roller 311 are parallel to each other; the driving cam 5 includes a proximal end 501 and a distal end 502, the proximal end 501 is the end close to the rotation center axis of the driving cam 5, and the distal end 502 is away from the driving cam 5. At one end of the rotating center axis, a track rib 51 extends from the edge of the driving cam 5, and the track rib 51 includes a spiral guide section 511 with a gradual radius. The spiral guide section 511 is arranged at the outer convex part of the driving cam 5, and the curvature radius of the spiral guide section 511 gradually increases from the proximal end 501 of the driving cam 5 to the distal end 502; a guide column 312 is provided on the side of the driving part 31 facing the driving cam 5, and the guide column 312 is slidingly matched with the inner wall guide of the track rib 51; the driving part 31 is provided with a mounting opening 310 corresponding to the roller 311, and the roller 311 is rotatably connected to the mounting opening 310 through a pin shaft. By arranging the roller 311 in the mounting opening 310, the space occupied by the push rod 3 on the base 1 can be reduced.

[0042] like Figure 3-Figure 5As shown, the base 1 is provided with a slide groove 11 along the length direction, and the push rod 3 is slidably arranged in the slide groove 11. The base 1 is provided with a track groove 12 on both side walls of the slide groove 11, and the track groove 12 is connected to the slide groove 11. Slide blocks 32 are provided on both sides of the push rod 3 corresponding to the track groove 12. The slide blocks 32 are guided and slidably matched with the track groove 12. The constraint of the slide groove 11 on the push rod 3 makes the push rod 3 only translate along the slide groove 11 in the length direction of the base, which can improve the consistency of the sliding direction of the push rod 3 relative to the base 1. At the same time, the track groove 12 and the slide block 32 are used. The guiding effect can prevent the push rod 3 from detaching from the base 1; a plurality of guide ribs 321 are provided on the contact surface between the side wall of the slider 32 and the track groove 12, and the guide ribs 321 can reduce the contact surface and friction between the slider 32 and the track groove 12, thereby improving the smoothness of the sliding of the push rod 3 in the slide groove 11; the swing arm 4 in this embodiment includes a first swing arm 41 and a second swing arm 42, one end of the first swing arm 41 is hinged to the handle body 2, the other end of the first swing arm 41 is hinged to the base 1, and the second swing arm 42 is away from the first swing arm 41. The first and second swing arms 41 and 42 are respectively provided with a first swing arm 41 and a second swing arm 42. The second swing arm 41 is ... The corresponding first swing arm 41 and second swing arm 42 are driven to reset under the reset force, thereby realizing the automatic reset of the handle body 2 from the extended state to the retracted state. In other embodiments, the setting of the reset torsion spring 411 and the reset spring 421 can also be cancelled, and the first swing arm 41 is pulled by the push rod 3 to drive the handle body 2 to reset toward the retracted direction. At this time, under the guiding sliding action of the end of the second swing arm 42 and the arc guide groove 13, the handle body 2 drives the end of the second swing arm 42 to slide in the arc guide groove 13, thereby realizing the forced reset of the second swing arm 42.

[0043] like Figures 6-11As shown, the track rib 51 includes a spiral starting segment 512 connected to the spiral guide segment 511, and the spiral starting segment 512 is arranged near the proximal end 501 of the driving cam 5. The curvature radius of the spiral starting segment 512 gradually increases from the proximal end 501 of the driving cam 5 to the distal end 502, and the curvature of the spiral starting segment 512 is greater than the curvature of the spiral guide segment 511, so that the torque generated by the spiral starting segment 512 is greater than that of the spiral guide segment 511, thereby improving the driving force of the handle body 2 in the front period of the extension process, which is conducive to the smooth extension of the handle body 2. At the same time, it can also reduce the return rate of the handle body 2 in the tail period of storage and retraction, ensuring that the handle body 2 can be accurately reset to the storage position; the track rib 51 also includes an arc-shaped anti-slip segment 513 connected to the spiral guide segment 511, and the arc-shaped anti-slip segment 513 is arranged near the distal end 502 of the driving cam 5. When the handle body 2 is in the extended state, the guide post 312 is located at the distal end 502 of the driving cam 5. At this time, the arc-shaped anti-slip section 513 plays the purpose of anti-slip, which can effectively avoid the guide post 312 and the track rib 51 of the driving cam 5 from disengaging from each other and causing cooperation failure due to excessive rotation of the driving cam 5. The side wall of the driving cam 5 is provided with a stop surface 52. When the handle body 2 moves to the storage state, the driving cam 5 is limited by the stop surface 52 and the side wall of the push rod 3; the driving cam 5 is provided with an avoidance groove 53 on the side close to the stop surface 52. The avoidance groove 53 is located in the inner concave position of the driving cam 5. When the handle body 2 moves to the storage state, the roller 311 and the avoidance groove 53 avoid and cooperate, which can prevent the driving cam 5 and the push rod 3 from colliding with the roller 311 at the end of the push rod 3 during the transmission process, causing damage to the components and jamming.

[0044] like Figure 5 and Figure 7-Figure 9As shown, a driving device 6 is provided on the base 1, and the driving device 6 includes a mounting shell 61 and a motor 62, a worm 63 and a worm wheel 64 built into the mounting shell 61. The motor 62 in this embodiment is set as a reversible motor 62, the worm 63 is meshed with the worm wheel 64, and the worm 63 is connected to the output shaft of the motor 62. The rotation center of the driving cam 5 is provided with a rotating driving shaft 54, and the worm wheel 64 is coaxially fixedly connected to the rotating driving shaft 54. The rotation of the motor 62 drives the worm 63 to rotate, and the worm wheel 64 drives the driving cam 5 to rotate through the rotating driving shaft 54. The meshing transmission mode of the worm wheel 64 and the worm 63 has a large transmission ratio, a compact structure and a smooth transmission effect; an angle limiting structure is provided between the mounting shell 61 and the driving cam 5. When the driving cam 5 rotates and drives the handle body 2 to move to the extended state or the retracted state In the extended state, the driving cam 5 is prevented from rotating by the mounting shell 61 through the angle limiting structure. The angle limiting structure can constrain the rotation angle of the driving cam 5 to prevent the driving cam 5 from rotating excessively and causing the cooperation to fail. The angle limiting structure includes a limiting protrusion 55 and a stop block 611. The limiting protrusion 55 is provided on the side of the driving cam 5 away from the track rib 51. The stop block 611 is provided on the mounting shell 61. The stop block 611 includes a first end face 6111 facing the proximal end 501 of the driving cam 5 and a second end face 6112 facing the distal end 502 of the driving cam 5. When the handle body 2 moves to the extended state, the limiting protrusion 55 stops and cooperates with the first end face 6111 of the stop block 611. When the handle body 2 moves to the retracted state, the limiting protrusion 55 stops and cooperates with the second end face 6112 of the stop block 611.

[0045] The basic working principle of the present invention is as follows: a push rod 3 is slidingly arranged on the base 1, and the push rod 3 is connected to the handle body 2 through a swing arm 4. A driving device 6 is provided on the base 1, and a driving cam 5 is provided at the output end of the driving device 6. The push rod 3 includes a driving part 31 close to the driving cam 5 side, and a roller 311 is rotatably provided at the end of the driving part 31, and a guide column 312 is provided on the side of the driving part 31 facing the driving cam 5, wherein the roller 311 is attached to the outer wall of the driving cam 5 and rolls with it, and a track rib 51 extends from the edge of the driving cam 5, and the track rib 51 includes a spiral guide section 511 with a gradual radius, and the curvature radius of the spiral guide section 511 gradually increases from the proximal end 501 of the driving cam 5 to the distal end 502, and the guide column 312 slides with the inner wall of the track rib 51; when the handle body 2 is in the storage state, the roller 311 is located at the proximal end 501 of the driving cam 5, and the driving cam is controlled at this time. When the handle 2 is in the extended state, the roller 311 is located at the distal end 502 of the driving cam 5. At this time, the driving cam 5 is controlled to rotate in the opposite direction, and the roller 311 rolls along the outer wall of the convex portion of the driving cam 5, so that the guide post 312 moves along the curved surface of the inner wall of the spiral guide section 511 from the distal end 502 of the driving cam 5 to the proximal end 501, thereby driving the push rod 3 to perform a reset movement, and the push rod 3 drives the handle 2 to the retracted state through the swing arm 4. The present invention utilizes the guiding traction force between the guide column 312 and the inner wall of the spiral guide section 511, and the rolling force between the roller 311 and the outer wall of the driving cam 5. The combined force of the two drives the push rod 3 to move, so that the push rod 3 can drive the handle body 2 to telescope and switch between the storage state and the extended state through the swing arm 4. In addition, the present invention avoids the situation where the driving cam 5 and the push rod 3 are stuck during the guiding cooperation by arranging the roller 311 at the end of the push rod 3 to roll with the outer wall of the driving cam 5, thereby improving the smoothness of the switching of the handle body 2 of the present invention between the storage state and the extended state, extending the service life of the present invention, and enabling the present invention to achieve the purpose of forced switching of the handle body between the storage state and the extended state by the forward and reverse rotation of the driving cam, while having the effect of not easily getting stuck between the driving cam and the push rod, thereby extending the service life.

[0046] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A cam forced reset structure, comprising a base (1) and a handle body (2), wherein the handle body (2) can move relative to the base (1) between a retracted state and an extended state, a push rod (3) is slidably provided on the base (1), and the handle body (2) and the push rod (3) are connected by a plurality of swing arms (4), characterized in that: It also includes a driving cam (5), the push rod (3) includes a driving portion (31) close to one side of the driving cam (5), the end of the driving portion (31) is rotatably provided with a roller (311), the roller (311) is attached to the outer wall of the driving cam (5) and rolls with it, and the rotation planes of the driving cam (5) and the roller (311) are parallel to each other; A track rib (51) extends from the edge of the driving cam (5), and the track rib (51) includes a spiral guide segment (511) with a gradually changing radius, and the curvature radius of the spiral guide segment (511) gradually increases from the proximal end (501) of the driving cam (5) toward the distal end (502); a guide column (312) is provided on the side of the driving portion (31) facing the driving cam (5), and the guide column (312) is in sliding engagement with the inner wall of the track rib (51).

2. The cam forced reset structure according to claim 1, characterized in that: The track rib (51) includes a spiral starting section (512) connected to the spiral guide section (511), the spiral starting section (512) is arranged close to the proximal end (501) of the driving cam (5), and the curvature of the spiral starting section (512) is greater than the curvature of the spiral guide section (511).

3. The cam forced reset structure according to claim 1, characterized in that: The track rib (51) includes an arc-shaped anti-slip section (513) connected to the spiral guide section (511), and the arc-shaped anti-slip section (513) is arranged close to the distal end (502) of the driving cam (5).

4. The cam forced reset structure according to claim 1, characterized in that: The side wall of the driving cam (5) is provided with a stop surface (52). When the handle body (2) moves to the storage state, the driving cam (5) is limited and stopped by the stop surface (52) and the side wall of the push rod (3).

5. The cam forced reset structure according to claim 4, characterized in that: A side of the driving cam (5) close to the stop surface (52) is provided with an avoidance groove (53); when the handle body (2) moves to the storage state, the roller (311) avoids and cooperates with the avoidance groove (53).

6. The cam forced reset structure according to claim 1, characterized in that: The driving portion (31) is provided with a mounting opening (310) corresponding to the roller (311), and the roller (311) is rotatably connected to the mounting opening (310) via a pin shaft.

7. The cam forced reset structure according to claim 1, characterized in that: The invention also includes a driving device (6), which includes a mounting housing (61) and a motor (62), a worm (63) and a worm wheel (64) built into the mounting housing (61). The worm (63) is engaged with the worm wheel (64). The worm (63) is connected to the output shaft of the motor (62). The rotation center of the driving cam (5) is provided with a rotating driving shaft (54). The worm wheel (64) is coaxially fixedly connected to the rotating driving shaft (54).

8. The cam forced reset structure according to claim 7, characterized in that: An angle limiting structure is provided between the mounting housing (61) and the driving cam (5); when the driving cam (5) rotates and drives the handle body (2) to move to an extended state or a retracted state, the driving cam (5) is locked in rotation with the mounting housing (61) through the angle limiting structure.

9. The cam forced reset structure according to claim 8, characterized in that: The angle limiting structure comprises a limiting protrusion (55) and a stop block (611), wherein the limiting protrusion (55) is provided on a side of the driving cam (5) away from the track rib (51), and the stop block (611) is provided on the mounting housing (61), and the stop block (611) comprises a first end surface (6111) facing the proximal end (501) of the driving cam (5) and a second end surface (6112) facing the distal end (502) of the driving cam (5); When the handle body (2) moves to an extended state, the limiting protrusion (55) engages with the first end surface (6111) of the stop block (611); When the handle body (2) moves to the retracted state, the position-limiting protrusion (55) engages with the second end surface (6112) of the stop block (611).

10. The cam forced reset structure according to claim 1, characterized in that: The base (1) is provided with a slide groove (11) along the length direction, and the push rod (3) is slidably arranged in the slide groove (11). The base (1) is provided with track grooves (12) on both side walls of the slide groove (11), and the track groove (12) is connected with the slide groove (11). Slide blocks (32) are provided on both sides of the push rod (3) corresponding to the track groove (12), and the slide blocks (32) are guided and slidably matched with the track groove (12).

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