Forced reset structure of cam

Abstract

The utility model discloses a cam forced reset structure which comprises a base, a handle body and a driving cam, the handle body can move between a storage state and an extending state relative to the base, a push rod is arranged on the base in a sliding mode, the handle body is connected with the push rod through a swing arm, the push rod comprises a driving part, and a roller is arranged at the end of the driving part in a rotating mode. The roller is attached to the outer wall of the driving cam and is in rolling fit with the driving cam; a track rib extends from the edge of the driving cam and comprises a spiral guide section; a guide column is arranged on the side, facing the drive cam, of the drive part and is in guide sliding fit with the inner wall of the spiral guide section. Therefore, the purpose that the handle body is forcibly switched between the storage state and the extending state can be achieved through forward and reverse rotation of the driving cam, and the effects that the driving cam and the push rod are not prone to being stuck, and the service life is prolonged are achieved.

Description

Technical Field

[0001] This utility model relates to the field of automotive door handle technology, and in particular to a cam forced reset structure. Background Technology

[0002] Chinese patent CN210217430U discloses a concealed automotive exterior door handle structure. The handle includes a handle body with a first mounting portion and a second mounting portion on each side. An actuation device further includes a housing with an actuating rod hinged to it. The front end of the actuating rod is hinged to the first mounting portion of the handle. A push rod is slidably mounted on the housing, and an unlocking rod is slidably connected to it. The head of the push rod contacts the tail of the unlocking rod, and the front end of the unlocking rod is hinged to the second mounting portion of the handle. The housing has features for engaging the push rod and the unlocking rod. The guiding structure provides guidance, and the actuation device also includes a drive mechanism for pushing the push rod to slide and pushing the actuation rod to swing. A locking ring is hinged to the door, and the unlocking rod is provided with a cooperating part that works with the locking ring to drive the locking ring to rotate. The locking ring is connected to the unlocking lock of the door. The actuation device also includes a reset structure that resets the locking ring, unlocking rod, push rod, and actuation rod. The reset structure includes a first torsion spring and a second torsion spring. The drive mechanism includes a motor and a push block that extends or retracts from the motor. The push block pushes the push rod to slide, and at the same time, the push block pushes the actuation rod to swing.

[0003] However, the aforementioned door handle has the following drawbacks: the door handle uses a push block at the head to directly push the push rod, which drives the actuator rod and the unlocking rod to rotate in the unlocking direction, thereby pushing the handle out of the housing. However, the push block can only push the push rod to move in the unlocking direction. The push rod's reset is achieved through the first torsion spring and the second torsion spring. After long-term use, the first torsion spring and the second torsion spring will reduce their elasticity or fail due to rust and aging, resulting in the handle not being able to reset completely. This needs to be improved. Utility Model Content

[0004] The purpose of this invention is to provide a cam forced reset structure, which enables the handle body to be forcibly switched between the retracted and extended states by driving the cam to rotate forward and backward. It also has the effect of preventing jamming between the drive cam and the push rod and extending the service life.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a cam forced reset structure, including 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 transmission assembly, and also including a drive cam, the push rod including a drive part near the drive cam, the end of the drive part being rotatably provided with a roller, the roller being in contact with the outer wall of the drive cam and rollingly engaging with it;

[0006] The drive cam has a track rib extending from its edge. The track rib includes a helical guide section. The drive part has a guide post on the side facing the drive cam. The guide post slides and guides the inner wall of the helical guide section.

[0007] By adopting the above technical solution, when the handle body is in the retracted state, the roller is close to the rotation center of the drive cam. At this time, the drive cam is controlled to rotate, and the guide post slides along the arc surface of the inner wall of the spiral guide section. During this process, the roller of the drive part always rolls against the outer wall of the inner concave part of the drive cam, so that the guide post moves away from the drive cam along the trajectory rib, thereby driving the push rod to move in the unlocking direction of the handle body on the base. The push rod then drives the handle body to move to the extended state through the swing arm. When the handle body is in the extended state, the roller is in a position away from the rotation center of the drive cam. At this time, the drive cam is controlled to rotate in the opposite direction, and the roller rolls against the outer wall of the outer convex part of the drive cam, so that the guide post moves along the arc surface of the inner wall of the spiral guide section towards the rotation center of the drive cam, thereby driving the push rod to perform a reset movement. The push rod then drives the handle body to move to the retracted state through the swing arm. This invention utilizes the guiding traction force between the guide post and the inner wall of the spiral guide section, and the rolling force between the roller and the outer wall of the drive cam. The combined force of these two forces drives the push rod to move, and then the push rod, through the swing arm, switches the handle body between the retracted and extended states. In addition, by setting a roller at the end of the push rod to roll and cooperate with the outer wall of the drive cam, this invention avoids jamming when the drive cam and the push rod are in guiding cooperation, improving the smoothness of the handle body switching between the retracted and extended states, and extending the service life of this invention. This invention enables the forced switching of the handle body between the retracted and extended states through the forward and reverse rotation of the drive cam, and also has the effect of preventing jamming between the drive cam and the push rod and extending the service life.

[0008] A further feature of this invention is that the helical guide segment has a gradually changing radius, and the radius of curvature of the helical guide segment gradually increases from the proximal end to the distal end of the driving cam.

[0009] A further feature of this invention is that the trajectory rib includes a spiral starting section connected to the spiral guide section, the spiral starting section is located near the proximal end of the drive cam, and the curvature of the spiral starting section is greater than the curvature of the spiral guide section.

[0010] By adopting the above technical solution, the torque generated by the spiral start section is greater than that of the spiral guide section, which increases 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 end stage of retraction, ensuring that the handle body can be accurately reset to the storage position.

[0011] A further feature of this invention is that the trajectory rib includes an arc-shaped anti-detachment section connected to the spiral guide section, and the arc-shaped anti-detachment section is located near the distal end of the drive cam.

[0012] By adopting the above technical solution, when the handle body is in the extended state, the guide post is located at the distal end of the drive cam. At this time, the arc-shaped anti-disengagement section plays the role of preventing disengagement and can effectively avoid the situation where the drive cam and the guide post disengage due to excessive rotation of the drive cam.

[0013] A further feature of this invention is that the side wall of the drive cam is provided with a stop surface, and when the handle body moves to the retracted state, the drive cam is limited and stopped by the side wall of the push rod through the stop surface.

[0014] A further feature of this invention is that a clearance groove is provided on the side of the drive cam near the stop surface, and when the handle body moves to the retracted state, the roller avoids and cooperates with the clearance groove.

[0015] By adopting the above technical solution, it is possible to prevent the roller at the end of the push rod from colliding with the drive cam during the transmission process, which could lead to damage and jamming.

[0016] A further feature of this invention is that it includes a drive device, which includes a mounting housing and a motor, a worm gear, and a worm wheel built into the mounting housing. The worm gear meshes with the worm wheel, and the worm gear is connected to the output shaft of the motor. The rotation center of the drive cam is provided with a rotary drive shaft, and the worm wheel is coaxially and fixedly connected to the rotary drive shaft.

[0017] By adopting the above technical solution, the motor rotation drives the worm gear to rotate, and the worm wheel drives the drive cam to rotate through the rotating drive shaft. The meshing transmission between the worm wheel and the worm gear has the effects of large transmission ratio, compact structure and smooth transmission.

[0018] A further feature of this invention is that an angle limiting structure is provided between the mounting housing and the drive cam. When the drive cam rotates and drives the handle body to the extended or retracted state, the drive cam engages with the mounting housing to prevent rotation through the angle limiting structure.

[0019] By adopting the above technical solution, the angle limiting structure can constrain the rotation angle of the drive cam, preventing the drive cam from rotating excessively and causing the engagement to fail.

[0020] A further feature of this invention is that the angle limiting structure includes a limiting protrusion and a stop block. The limiting protrusion is located on the side of the drive cam away from the trajectory rib, and the stop block is located on the mounting housing. The stop block includes a first end face facing the proximal end of the drive cam and a second end face facing the distal end of the drive cam.

[0021] When the handle body moves to the extended state, the limiting protrusion engages with the first end face of the stop block.

[0022] When the handle body moves to the retracted state, the limiting protrusion engages with the second end face of the stop block.

[0023] A further feature of this invention is that: the base has a sliding groove along its length, the push rod is slidably disposed in the sliding groove, the base has a trajectory groove on both sides of the sliding groove, the trajectory groove is connected to the sliding groove, and the push rod has sliders on both sides corresponding to the trajectory groove, the sliders are guided and slidably engaged with the trajectory groove.

[0024] By adopting the above technical solution, the push rod is constrained by the slide groove, so that the push rod can only move along the direction of the slide groove. This can improve the consistency of the sliding direction of the push rod relative to the base. By using the guiding effect of the track groove and the slider, the push rod can be prevented from detaching from the base.

[0025] In summary, this utility model has the following beneficial effects:

[0026] A push rod is slidably mounted on a base. The push rod is connected to the handle body via a swing arm. A drive device is mounted on the base, and a drive cam is mounted at the output end of the drive device. The push rod includes a drive part near the drive cam. A roller is rotatably mounted at the end of the drive part, and a guide post is mounted on the side of the drive part facing the drive cam. The roller is in contact with and rolls against the outer wall of the drive cam. A trajectory rib extends from the edge of the drive cam. The trajectory rib includes a spiral guide section with a gradually changing radius. The radius of curvature of the spiral guide section gradually increases from the proximal end to the distal end of the drive cam. The guide post slides and guides the inner wall of the trajectory rib. This invention utilizes the guiding traction force between the guide post and the inner wall of the spiral guide section, and the rolling force between the roller and the outer wall of the drive cam. The combined force of these two forces drives the push rod to move, and then the push rod, through the swing arm, switches the handle body between the retracted and extended states. In addition, by setting a roller at the end of the push rod to roll and cooperate with the outer wall of the drive cam, this invention avoids jamming when the drive cam and the push rod are in guiding cooperation, improving the smoothness of the handle body switching between the retracted and extended states, and extending the service life of this invention. This invention enables the forced switching of the handle body between the retracted and extended states through the forward and reverse rotation of the drive cam, and also has the effect of preventing jamming between the drive cam and the push rod and extending the service life. Attached Figure Description

[0027] Figure 1 This is an overall structural diagram of the utility model, showing the handle body in a stowed state.

[0028] Figure 2 This is an overall structural diagram of the utility model, with the handle body in an extended state.

[0029] Figure 3 This is a utility model Figure 1 Another perspective.

[0030] Figure 4 This is a utility model Figure 3 A magnified view of a portion of region A in the middle.

[0031] Figure 5 This is an exploded view of this utility model.

[0032] Figure 6 This is a partial view of the guide post of this utility model sliding to the proximal end position of the drive cam, with the handle body in a retracted state.

[0033] Figure 7 This is a utility model Figure 6 A structural diagram from another perspective.

[0034] Figure 8 This is a utility model Figure 6 Exploded view.

[0035] Figure 9 This is a partial view of the guide post of this utility model sliding to the distal end of the drive cam, with the handle body in the extended state.

[0036] Figure 10 This is a structural diagram of the drive cam of this utility model.

[0037] Figure 11 This is a top view of the drive cam of this utility model.

[0038] In the diagram: 1. Base; 11. Slide groove; 12. Track groove; 13. Arc-shaped 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. Transmission assembly; 41. First swing arm; 411. Return torsion spring; 42. Second swing arm; 421. Return spring; 5. Drive cam; 501. Proximal cam. 502. Distal end; 51. Track rib; 511. Helical guide section; 512. Helical starting section; 513. Arc-shaped anti-detachment section; 52. Stop surface; 53. Clearance groove; 54. Rotary drive shaft; 55. Limiting protrusion; 6. Drive device; 61. Mounting housing; 611. Stop block; 6111. First end face; 6112. Second end face; 62. Motor; 63. Worm; 64. Worm wheel. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings.

[0040] A cam-forced reset structure, such as Figures 1-5 and Figure 11As shown, the device includes a base 1 and a handle body 2. 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 mounted on the base 1. The handle body 2 and the push rod 3 are connected by a transmission assembly 4. The device also includes a drive cam 5. The push rod 3 includes a drive portion 31 near the drive cam 5. A roller 311 is rotatably mounted at the end of the drive portion 31. The roller 311 fits against the outer wall of the drive cam 5 and rolls with it. In this embodiment, the rotation plane of the roller 311 is parallel to the rotation plane of the drive cam 5. The drive 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 drive cam 5, and the distal end 502 is the end away from the rotation center axis of the drive cam 5. At one end of the spindle, the edge of the drive cam 5 extends a trajectory rib 51. The trajectory rib 51 includes a spiral guide section 511 with a gradually changing radius. The spiral guide section 511 is located at the outer convex part of the drive cam 5. The radius of curvature of the spiral guide section 511 gradually increases from the proximal end 501 of the drive cam 5 to the distal end 502. The drive part 31 is provided with a guide post 312 on the side facing the drive cam 5. The guide post 312 is guided and slidably engaged with the inner wall of the trajectory rib 51. The drive part 31 is provided with a mounting port 310 corresponding to the roller 311. The roller 311 is rotatably connected to the mounting port 310 through a pin. By placing the roller 311 in the mounting port 310, the space occupied by the push rod 3 with the roller 311 on the base 1 can be reduced.

[0041] like Figures 3-5As shown, the base 1 has a groove 11 along its length, and the push rod 3 is slidably disposed within the groove 11. Track grooves 12 are formed on both sides of the groove 11, communicating with the groove 11. Slider blocks 32 are provided on both sides of the push rod 3 corresponding to the track grooves 12. The sliders 32 guide and slide in conjunction with the track grooves 12. By constraining the push rod 3 with the groove 11, the push rod 3 can only translate along the direction of the groove 11, improving the consistency of the sliding direction of the push rod 3 relative to the base 1. The guiding effect of the track grooves 12 and the sliders 32 avoids the push rod... 3. In the case of detachment from the base 1; guide ribs 321 are provided on the upper and lower sides of the slider 32 that contact the track groove 12, and guide ribs 321 are provided on the inner sidewall of the track groove 12 corresponding to the slider 32. The guide ribs 321 can reduce the contact area and friction between the slider 32 and the track groove 12, thereby improving the smoothness of the push rod 3 sliding 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, and the other end of the first swing arm 41 is hinged to the base 1. The second swing arm 42 The second swing arm 42 is positioned away from the first swing arm 41, with one end hinged to the handle body 2. The base 1 has an arc-shaped guide groove 13, and the other end of the second swing arm 42 is slidably disposed within the arc-shaped guide groove 13. The push rod 3 can push the first swing arm 41 and the second swing arm 42 to move the handle body 2 from the retracted state to the extended state. In addition, a return torsion spring 411 is provided between the first swing arm 41 and the base 1, and a return spring 421 is provided between the second swing arm 42 and the push rod 3. When the drive device 6 drives the push rod 3 to return to its original position via the drive cam 5, the return torsion spring 411 and the return spring 421 will be in place. The elastic restoring force of 21 drives the corresponding first swing arm 41 and second swing arm 42 to reset, thereby realizing the automatic reset of the handle body 2 from the extended state to the retracted state. In other embodiments, the reset torsion spring 411 and reset spring 421 can be omitted. The push rod 3 pulls the first swing arm 41 to drive the handle body 2 to reset in the retracted direction. At this time, under the guiding sliding action of the end of the second swing arm 42 and the arc-shaped guide groove 13, the handle body 2 drives the end of the second swing arm 42 to slide in the arc-shaped guide groove 13, thereby realizing the forced reset of the second swing arm 42.

[0042] like Figures 6-11As shown, the trajectory rib 51 includes a spiral starting section 512 connected to the spiral guide section 511. The spiral starting section 512 is located near the proximal end 501 of the drive cam 5, and the curvature of the spiral starting section 512 is greater than that of the spiral guide section 511. This results in a greater torque generated by the spiral starting section 512 compared to the spiral guide section 511, increasing the driving force of the handle body 2 in the initial stage of the extension process. This facilitates the smooth extension of the handle body 2 and also reduces the return rate of the handle body 2 in the retracted stage, ensuring that the handle body 2 can accurately return to the retracted position. The trajectory rib 51 also includes an arc-shaped anti-detachment section 513 connected to the spiral guide section 511. The arc-shaped anti-detachment section 513 is located near the distal end 502 of the drive cam 5. When the handle body 2 is in the extended state... In the retracted state, the guide post 312 is located at the distal end 502 of the drive cam 5. At this time, the arc-shaped anti-detachment section 513 plays the role of anti-detachment, which can effectively prevent the drive cam 5 from disengaging from the guide post 312 due to excessive rotation of the drive cam 5. The side wall of the drive cam 5 is provided with a stop surface 52. When the handle body 2 moves to the retracted state, the drive cam 5 is limited and stopped by the side wall of the push rod 3 through the stop surface 52. The drive cam 5 is provided with a relief groove 53 on the side near the stop surface 52. The relief groove 53 is located in the concave part of the drive cam 5. When the handle body 2 moves to the retracted state, the roller 311 and the relief groove 53 cooperate to avoid collision between the roller 311 at the end of the push rod 3 and the drive cam 5 during the transmission process, which can prevent the drive cam 5 and the push rod 3 from being damaged and jammed due to collision.

[0043] like Figure 5 and Figures 7-9As shown, a driving device 6 is provided on the base 1. The driving device 6 includes a mounting housing 61 and a motor 62, a worm gear 63, and a worm wheel 64 built into the mounting housing 61. In this embodiment, the motor 62 is a reversible motor. The worm gear 63 meshes with the worm wheel 64. The worm gear 63 is connected to the output shaft of the motor 62. The rotation center of the drive cam 5 is provided with a rotary drive shaft 54. The worm wheel 64 is coaxially fixedly connected to the rotary drive shaft 54. The rotation of the motor 62 drives the worm gear 63 to rotate. The worm wheel 64 drives the drive cam 5 to rotate through the rotary drive shaft 54. The meshing transmission method of the worm wheel 64 and the worm gear 63 has a large transmission ratio, compact structure, and smooth transmission effect. An angle limiting structure is provided between the mounting housing 61 and the drive cam 5. When the drive cam 5 rotates, it drives the handle body 2 to move to the extended state or the retracted state. In the extended state, the drive cam 5 engages with the mounting housing 61 through an angle limiting structure to prevent rotation. The angle limiting structure can constrain the rotation angle of the drive cam 5, preventing excessive rotation of the drive cam 5 and thus ensuring proper engagement. The angle limiting structure includes a limiting protrusion 55 and a stop block 611. The limiting protrusion 55 is located on the side of the drive cam 5 away from the track rib 51, and the stop block 611 is located on the mounting housing 61. The stop block 611 includes a first end face 6111 facing the proximal end 501 of the drive cam 5 and a second end face 6112 facing the distal end 502 of the drive cam 5. When the handle body 2 moves to the extended state, the limiting protrusion 55 engages 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 engages with the second end face 6112 of the stop block 611.

[0044] The basic working principle of this utility model is as follows: A push rod 3 is slidably arranged on the base 1. The push rod 3 is connected to the handle body 2 through a swing arm 4. A drive device 6 is provided on the base 1. A drive cam 5 is provided at the output end of the drive device 6. The push rod 3 includes a drive part 31 near the drive cam 5. A roller 311 is rotatably provided at the end of the drive part 31. A guide post 312 is provided on the side of the drive part 31 facing the drive cam 5. The roller 311 fits against the outer wall of the drive cam 5 and rolls with it. A trajectory rib 51 extends from the edge of the drive cam 5. The trajectory rib 51 includes a spiral guide section 511 with a gradually changing radius. The radius of curvature of the spiral guide section 511 gradually increases from the proximal end 501 of the drive cam 5 to the distal end 502. The guide post 312 slides with the inner wall of the trajectory rib 51. When the handle body 2 is in the retracted state, the roller 311 is located at the proximal end 501 of the drive cam 5. At this time, the drive cam is controlled. As wheel 5 rotates, guide post 312 slides along the arc-shaped surface of the inner wall of spiral guide section 511. During this process, roller 311 of drive part 31 always rolls against the outer wall of the inner concave part of drive cam 5, causing guide post 312 to move along track rib 51 from the proximal end 501 to the distal end 502 of drive cam 5, thereby driving push rod 3 to move on base 1 in the unlocking direction of handle body 2. Push rod 3 then drives handle body 2 to the extended state through swing arm 4. When handle body 2 is in the extended state, roller 311 is located at the distal end 502 of drive cam 5. At this time, drive cam 5 is controlled to rotate in the opposite direction, and roller 311 rolls against the outer wall of the outer convex part of drive cam 5, causing guide post 312 to move along the arc-shaped surface of the inner wall of spiral guide section 511 from the distal end 502 to the proximal end 501 of drive cam 5, thereby driving push rod 3 to perform a reset movement. Push rod 3 then drives handle body 2 to the retracted state through swing arm 4. This invention utilizes the guiding traction force between the guide post 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 drive cam 5. The combined force of these two forces drives the push rod 3 to move, and then the push rod 3, through the swing arm 4, drives the handle body 2 to switch between the retracted and extended states. In addition, by setting the roller 311 at the end of the push rod 3 to roll and cooperate with the outer wall of the drive cam 5, this invention avoids jamming when the drive cam 5 and the push rod 3 are guided and cooperated, improving the smoothness of the switch between the retracted and extended states of the handle body 2, extending the service life of the invention. This invention enables the forced switching of the handle body between the retracted and extended states through the forward and reverse rotation of the drive cam, and also has the effect of preventing jamming between the drive cam and the push rod and extending the service life.

[0045] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A cam-driven forced reset structure, comprising a base (1) and a handle body (2), wherein the handle body (2) is movable relative to the base (1) between a retracted state and an extended state, a push rod (3) is slidably disposed on the base (1), and the handle body (2) and the push rod (3) are connected by a transmission assembly (4), characterized in that: It also includes a drive cam (5), and the push rod (3) includes a drive part (31) near the drive cam (5), and the end of the drive part (31) is rotatably provided with a roller (311), and the roller (311) fits against the outer wall of the drive cam (5) and rolls with it; The drive cam (5) has a track rib (51) extending from its edge. The track rib (51) includes a spiral guide section (511). The drive part (31) has a guide post (312) on the side facing the drive cam (5). The guide post (312) slides and guides the inner wall of the spiral guide section (511).

2. The cam forced reset structure according to claim 1, characterized in that: The spiral guide section (511) has a gradually changing radius, and the radius of curvature of the spiral guide section (511) gradually increases from the proximal end (501) of the drive cam (5) toward the distal end (502).

3. The cam forced reset structure according to claim 2, characterized in that: The trajectory rib (51) includes a spiral starting section (512) connected to the spiral guide section (511). The spiral starting section (512) is located near the proximal end (501) of the drive cam (5), and the curvature of the spiral starting section (512) is greater than the curvature of the spiral guide section (511).

4. The cam forced reset structure according to claim 2, characterized in that: The trajectory rib (51) includes an arc-shaped anti-detachment section (513) connected to the spiral guide section (511), and the arc-shaped anti-detachment section (513) is disposed near the distal end (502) of the drive cam (5).

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

6. The cam forced reset structure according to claim 5, characterized in that: The drive cam (5) has a clearance groove (53) on the side near the stop surface (52). When the handle body (2) moves to the storage state, the roller (311) avoids and cooperates with the clearance groove (53).

7. The cam forced reset structure according to claim 1, characterized in that: It also includes a drive 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) meshes with the worm wheel (64). The worm (63) is connected to the output shaft of the motor (62). The rotation center of the drive cam (5) is provided with a rotary drive shaft (54). The worm wheel (64) is coaxially fixedly connected to the rotary drive 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 drive cam (5). When the drive cam (5) rotates and drives the handle body (2) to move to the extended state or the retracted state, the angle limiting structure is used to constrain the drive cam (5) to stop rotating relative to the mounting housing (61).

9. A cam forced reset structure according to claim 8, characterized in that: The angle limiting structure includes a limiting protrusion (55) and a stop block (611). The limiting protrusion (55) is located on the side of the drive cam (5) away from the track rib (51). The stop block (611) is located on the mounting housing (61). The stop block (611) includes a first end face (6111) facing the proximal end (501) of the drive cam (5) and a second end face (6112) facing the distal end (502) of the drive cam (5). When the handle body (2) moves to the extended state, the limiting protrusion (55) stops and engages with the first end face (6111) of the stop block (611); When the handle body (2) moves to the storage state, the limiting protrusion (55) and the second end face (6112) of the stop block (611) stop and cooperate.

10. The cam forced reset structure according to claim 1, characterized in that: The base (1) has a groove (11) along its length. The push rod (3) is slidably disposed in the groove (11). The base (1) has a track groove (12) on both sides of the groove (11). The track groove (12) is connected to the groove (11). The push rod (3) has sliders (32) on both sides corresponding to the track groove (12). The sliders (32) are guided and slidably engaged with the track groove (12).

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