Symmetrical steady collapse mechanism

Abstract

This invention relates to a symmetrical, stable, and collapsible mechanism, comprising a mounting base, an adjusting base, and a contact arm. The contact arm is rotatably mounted on the mounting base. The mounting base and the adjusting base are axially slidably disposed relative to each other along a transmission shaft. A collapsible assembly is disposed on the adjusting base. When the mounting base and the adjusting base move relative to each other, a limiting rod slides and abuts against a sliding member, pushing the sliding member to rotate around a pivot point, causing the telescopic elastic member to stretch or compress. The collapsible assembly further includes a connecting rod, one end of which is rotatably mounted on the adjusting base, and the other end is hinged to the contact arm. When the mounting base and the adjusting base slide relative to each other, the contact arm swings under the action of the connecting rod. Using the above technical solution, this invention has a simple structure, rapid response, stable output of massage force during normal operation, and rapid collapse upon impact, effectively reducing the risk of injury to occupants.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of massager, especially relates to a symmetrical holding and collapsing mechanism. BACKGROUND

[0002] With the development of automobile industry, people's demand for riding comfort is increasing, and the automobile massage seat with built-in massage function has become a common configuration of medium and high-end vehicles. These massage seats usually drive massage arms to move through motors to simulate human hands to rub, knock and other actions to relieve the fatigue of the driver and passenger.

[0003] However, this traditional rigid driving mode has safety hazards under unexpected impact conditions such as vehicle collision. In the collision, the body of the occupant will move backward violently due to inertia, and the protruding massage arm may cause concentrated impact injury to the back of the occupant, thereby aggravating the injury. To solve this problem, there is an urgent need in the art for a simple and reliable mechanical safety protection scheme that can quickly respond and be integrated into the massage arm driving mechanism, so that it can stably output massage force during normal operation, and quickly release the rigid connection to allow the massage arm to collapse and shift during unexpected impact, thereby fundamentally reducing the risk of impact injury. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art, and the present application provides a symmetrical holding and collapsing mechanism, which solves the problem that the body of the occupant will move backward violently due to inertia, and the protruding massage arm or other structure may cause impact injury to the back.

[0005] The technical scheme of the present application is a symmetrical holding and collapsing mechanism, which comprises a mounting seat, an adjusting seat and a contact arm, the contact arm is rotatably arranged on the mounting seat, the mounting seat is provided with an adjusting motor and a transmission shaft rotatably arranged thereon, the output end of the adjusting motor drives the transmission shaft to rotate, the mounting seat and the adjusting seat are relatively slidably arranged along the transmission shaft, the adjusting seat is provided with a collapsing assembly, the collapsing assembly comprises a nut holder slidably arranged on the adjusting seat, the nut holder is fixedly or integrally provided with a nut, the transmission shaft comprises a threaded segment threadedly connected with the nut, and the transmission shaft rotates to drive the nut and the nut holder to move axially along the transmission shaft. The collapsing assembly further comprises two sliding members symmetrically arranged on both sides of the transmission shaft, the sliding members are rotatably mounted on the nut holder through a rotation support point, two limiting rods are fixedly arranged on the adjusting seat, each limiting rod is slidably arranged on a sliding member, and a telescopic elastic member is arranged between the two sliding members, the two ends of the telescopic elastic member are fixedly arranged on the two sliding members, and the fixed points are located outside the rotation support points of the sliding members. When the mounting base and the adjusting base move relatively, the limiting rods slide and abut against the sliding members and push the sliding members to rotate around the rotating pivots, and the stretchable elastic members are stretched or compressed to deform; The collapsing assembly further comprises a connecting rod, one end of the connecting rod is arranged on the adjusting base relatively rotatably, and the other end of the connecting rod is hingedly connected to the contact arm, and when the mounting base and the adjusting base slide relatively, the contact arm swings under the action of the connecting rod.

[0006] By adopting the above technical scheme, after the motor is started, the motor drives the transmission shaft to rotate, the threaded segment on the transmission shaft drives the nut and the nut holder to move along the transmission shaft in the axial direction, when the nut holder moves, the rotating pivot connected with the nut holder moves together, so that the two sliding members can swing around the corresponding limiting rods, after swinging, the stretchable elastic members are stretched or compressed at the two ends to deform, at the same time, the limiting rods abut against the sliding members, the swinging force is transmitted to the adjusting base through the limiting rods, at this time, the sliding of the adjusting base is not blocked, and because the deformation of the stretchable elastic members needs to overcome the corresponding elastic force, the adjusting base moves synchronously relative to the mounting base along with the movement of the nut holder, thereby the connecting rod connected with the adjusting base swings to change the inclination angle between the contact arm and the adjusting base, so that the contact arm is lifted or flattened, when the contact arm is a massage arm, the lifting angle of the contact arm is changed to change the force and angle of massage, and when the contact arm is impacted by the human body or other forces, the contact arm is buffered and collapsed through the action of the stretchable elastic members; The collapse action is as follows: After the contact arm is impacted by a person or other force, the impact force is transmitted to the connecting rod. The connecting rod converts the force into a pushing or pulling force on the adjusting seat. Under the action of the impact force, the adjusting seat is forced to slide away from the mounting seat. When the adjusting seat moves, it drives the limiting rod to move together. However, the sliding part is rotatably connected to the nut frame. Due to the self-locking of the thread and the inertia of the motor, the position of the nut frame is locked, thus locking the rotation fulcrum. The movement of the limiting rod resists and pushes the sliding part to swing around the rotation fulcrum. As a result, both sliding parts rotate symmetrically, and the distance between the two ends of the telescopic elastic part changes, causing the telescopic elastic part to be forcibly stretched or compressed. The angle between it and the axial straight line of the transmission shaft increases. During the process of the angle increasing, the deformation of the telescopic elastic part continues to increase. At this time, the elastic force can play a buffering role against the impact force; until... When the elastic force of the telescopic elastic component is perpendicular to the axial direction of the drive shaft, the telescopic elastic component is deformed and stretched to its longest length or compressed to its shortest length, and the stored energy reaches its peak value, which is in a critical state. At this time, the sliding component is parallel to the telescopic elastic component. If the impact force continues, the adjusting seat continues to slide, and the included angle exceeds the vertical critical point. The mechanical balance is broken, and the energy stored in the deformed telescopic elastic component is released instantly. The telescopic elastic component moves in the elastic reset direction. At this time, the reset elastic force serves as the power for the adjusting seat to move away from the mounting seat from the sliding position. By squeezing and pushing the limit rod, it pushes the adjusting seat to move quickly together with the impact force. After the contact arm loses the elastic buffer force of the telescopic elastic component, the contact arm quickly swings to the flat position under the drive of the connecting rod, reducing the lifting angle on the adjusting seat and completing the collapse, which greatly reduces the risk of injury to the occupants. Reset Action: After the collapse action is completed, the contact arm has retracted and flattened, and the impact force has disappeared. At this time, the distance between the adjusting seat and the mounting seat reaches its maximum, and the mechanism is in a new stable state: the telescopic elastic element is in a partially compressed or stretched state. After it is determined to be safe, the adjusting motor rotates, driving the transmission shaft to rotate. Since the nut is fixed in the nut bracket, the rotation of the transmission shaft will drive the nut bracket to move along the transmission shaft axis towards the initial position. The movement of the nut bracket will simultaneously pull the rotating fulcrum connected to it to move together. Since the limit rod and the sliding element are in abutting position, and the adjusting seat and the mounting seat are in a limit state due to the collapse, the position of the limit rod is locked. The movement of the nut bracket will first drive the rotating fulcrum to move, and at the same time, the sliding element will rotate around the stationary limit rod as the axis of rotation, thereby realizing the rotation of the sliding element and gradually restoring its tilt angle with the transmission shaft to the initial angle. During the swing process, the telescopic elastic member is forced to deform, and the energy storage is started again, until the inclination angle of the transmission shaft is perpendicular, at this time, it is a critical state, then the nut frame continues to slide, continues to push the sliding member to rotate, so that the inclination angle of the telescopic elastic member and the transmission shaft continues to change, the telescopic elastic member resets again, at this time, the nut is controlled by the adjusting motor, and the elastic force pushes the adjusting seat to move reversely, the distance between the adjusting seat and the mounting seat is reduced, the contact arm is driven by the connecting rod to be lifted again, after resetting, the adjusting seat and the nut frame are locked again by the elastic force of the telescopic elastic member, at this time, the adjusting motor is reversely rotated to adjust the angle of the contact arm to be lifted, and the resetting is completed, so that the mechanism has simple structure, rapid response, stable output massage force during normal work, and can quickly collapse when impacted, thereby effectively reducing the injury risk to the passenger.

[0007] Further provided in the application is that two guide rods are oppositely arranged on the adjusting seat and symmetrically arranged on both sides of the transmission shaft, and the two guide rods are arranged in parallel with the transmission shaft, and the nut frame is slidably connected with one guide rod on each side.

[0008] With the above further arrangement, the two guide rods and the nut frame form two guide rail and block pairs, the sliding connection of the nut frame relative to the adjusting seat is realized, the rotation of the nut frame is prevented when the nut frame slides relative to the mounting seat, and the two sliding members can stably rotate when collapsing, resetting and adjusting the angle of the contact arm to be lifted, and the telescopic elastic member between the two sliding members can be compressed or stretched.

[0009] Further provided in the application is that a strip-shaped hole is arranged on the sliding member, and a limiting rod is movably arranged in the strip-shaped hole, and the limiting rod slides in the strip-shaped hole and abuts against the inner wall of the strip-shaped hole to push the sliding member to rotate around the rotation fulcrum when the mounting seat and the adjusting seat move relative to each other.

[0010] With the above further arrangement, the limiting rod can slide in the strip-shaped hole, and the abutment of the limiting rod and the inner wall of the upper side or the lower side of the strip-shaped hole can realize the force transmission between the limiting rod and the sliding member, realize the rotating action of the sliding member, and the strip-shaped structure provides space for the movement of the limiting rod caused by the deformation of the telescopic elastic member.

[0011] Further provided in the application is that the telescopic elastic member is symmetrically arranged on both ends of the two sliding members with the transmission shaft as the symmetry axis.

[0012] By further configuring the above-mentioned components, the two ends of the telescopic elastic element are symmetrically arranged on both sides of the transmission shaft. The symmetrical structure ensures that the rotation angle, speed, and deformation of the two sliding elements are always consistent. During the rotation of the sliding element or the deformation of the telescopic elastic element, the forces on both sides are completely symmetrical, and no additional lateral force or deflection torque is generated. This ensures that the telescopic elastic elements on both sides can reach this critical state simultaneously and synchronously, avoiding the nut frame or sliding element from becoming skewed or stuck during the movement.

[0013] A further provision of the present invention includes: a kneading shaft rotatably mounted on the mounting base; the kneading shaft includes a transmission section and two inclined sections located at both ends of the transmission section; the central axis of the inclined section has an inclination angle with the central axis of the transmission section; the contact arm is rotatably mounted on the inclined section; and a kneading motor is also mounted on the mounting base, the output end of which is connected to the transmission section to drive the kneading shaft to rotate.

[0014] By further configuring the above-mentioned settings, and by setting the angle between the central axis of the inclined section and the transmission section, when the kneading shaft is driven to rotate as a whole by the kneading motor, its contact arms not only rotate around the axis of the transmission section, but also rotate around their own axis on the inclined section. The combined action of the two makes the two contact arms simulate a kneading massage action that both rolls and applies pressure in the center, which can be applied to massagers.

[0015] A further feature of the present invention is that a kneading arm is rotatably mounted on the inclined section, and a linkage is hinged between the kneading arm and the connecting rod. When the connecting rod swings, the kneading arm swings synchronously under the action of the linkage.

[0016] Furthermore, with the above-mentioned further configuration, a kneading arm can also be installed on the inclined section. The kneading arm and the contact arm are set at an angle. When the kneading shaft rotates, the kneading arm and the contact arm can perform kneading and massage actions on different parts together. In addition, with the linkage rod, when the linkage rod drives the contact arm to swing to adjust the angle or perform a collapsing action, the kneading shaft can be raised or lowered together through the linkage rod to achieve overall collapsing and angle adjustment.

[0017] A further embodiment of the present invention includes: a striking shaft and a striking motor are provided on the adjusting base; the striking shaft is rotatably mounted on the adjusting base; the striking motor is fixedly mounted on the adjusting base; the striking shaft includes a middle section and eccentric sections on both sides of the middle section; the connecting rod is rotatably mounted on the eccentric sections; and the middle section is connected to the output end of the striking motor.

[0018] With the above-mentioned further configuration, the movement of the connecting rod in the radial direction of the striking axis is achieved by the rotation of the eccentric section, so as to drive the connecting rod to realize the swinging striking of the contact arm. When applied to a massager, it can perform a striking massage action.

[0019] A further embodiment of the present invention includes: the connecting rod includes a ball sleeve and a connecting rod cover; the ball sleeve is fixedly disposed on the eccentric section; the connecting rod cover is fixedly connected to the connecting rod; and the ball sleeve is accommodated within the connecting rod cover to form a spherical movable fit with it.

[0020] With the above-mentioned further configuration, the spherical fit allows the connection between the connecting rod and the striking shaft to have multiple degrees of rotational freedom, allowing the connecting rod to freely adjust its direction within a certain angle. When the contact arm swings axially with the rotation on the inclined section, the connecting rod can swing axially along with it to ensure that the impact force can be more effectively transmitted to the collapse assembly through the connecting rod, avoiding failure of the collapse function due to jamming of the hinge point.

[0021] A further feature of the present invention is that at least one bearing seat is fixedly provided on the mounting base, and each bearing seat is rotatably connected to the transmission shaft via a bearing.

[0022] With the above-mentioned further design, the bearing housing provides a stable and low-friction rotational support for the drive shaft, ensuring that the power of the regulating motor can be efficiently and smoothly transmitted to the threaded section during normal operation. At the same time, the bearing housing can isolate the drive shaft from axial impact forces that may be received, protect the output end of the regulating motor from direct axial impact, and improve the service life of the regulating motor.

[0023] The invention is further configured such that: a contact arm and a kneading arm are rotatably provided on both inclined sections, a connecting rod is provided between each contact arm and the striking shaft, and a linkage rod is provided between each connecting rod and the corresponding kneading arm.

[0024] With the above-mentioned further configuration, contact arms and kneading arms are provided on both inclined sections, so that the kneading arms and contact arms are arranged in pairs. When the kneading shaft rotates, the paired contact arms and kneading arms can roll symmetrically to apply pressure to the center, thereby realizing the kneading massage action. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure during normal operation in a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure in the collapsed state in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the overall structure of the collapse component in a specific embodiment of the present invention; Figure 5 This is a schematic diagram showing the collapse component in normal working state, critical state, and collapse device state in a specific embodiment of the present invention. Figure 6 This is a schematic diagram of the overall structure of the kneading shaft in a specific embodiment of the present invention; Figure 7 This is a schematic diagram of the overall structure of the striking shaft in a specific embodiment of the present invention; Figure 8 This is a schematic diagram of the overall structure of the connecting rod in a specific embodiment of the present invention.

[0026] In the diagram: 1. Mounting base; 11. Adjusting motor; 12. Drive shaft; 13. Kneading shaft; 131. Inclined section; 132. Drive section; 14. Kneading motor; 15. Bearing seat; 2. Adjusting base; 21. Collapsible bracket; 22. Guide rod; 23. Striking shaft; 231. Intermediate section; 232. Eccentric section; 24. Striking motor; 3. Collapsible assembly; 31. Nut bracket; 32. Nut; 33. Sliding component; 331. Strip hole; 34. Limiting rod; 35. Telescopic elastic component; 36. Rotation fulcrum; 4. Contact arm; 41. Connecting rod; 411. Ball sleeve; 412. Connecting rod cover; 5. Kneading arm; 51. Linkage rod. Detailed Implementation

[0027] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that in the description of this invention, all directional indications (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0029] Furthermore, in this invention, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0031] This embodiment provides a symmetrical, stable, and collapsible mechanism, such as... Figures 1-8As shown, it includes a mounting base 1 and an adjusting base 2, which are axially slidably disposed relative to each other along the transmission shaft 12. This collapsing mechanism can be applied to a massage mechanism, thereby including a massage assembly. The massage assembly includes a contact arm 4 and a kneading arm 5. The contact arm 4 and the kneading arm 5 can be the massage arms of the massage mechanism, and the massage arms can perform kneading or tapping actions controlled by the massage mechanism.

[0032] A drive shaft 12 and a kneading shaft 13 are rotatably mounted on the mounting base 1. The drive shaft 12 and the kneading shaft 13 are rotatably mounted on the mounting base 1 via bearings and corresponding bearing seats 15. An adjustment motor 11 and a kneading motor 14 are fixedly mounted on the mounting base 1. The output end of the adjustment motor 11 is connected to the drive shaft 12 to drive its rotation, and the output end of the kneading motor 14 is connected to the kneading shaft 13 to drive its rotation.

[0033] At least one bearing seat 15 is fixedly provided on the mounting base 1. Each bearing seat 15 is rotatably connected to the transmission shaft 12 through a bearing. The bearing seat 15 provides stable and low-friction rotational support for the transmission shaft 12, ensuring that the power of the regulating motor 11 can be transmitted efficiently and smoothly during normal operation. At the same time, the bearing seat 15 can isolate the axial impact force that the transmission shaft 12 may be subjected to, protecting the output end of the regulating motor 11 from direct axial impact.

[0034] The adjusting seat 2 is provided with a collapsible component 3, and a collapsible bracket 21 is fixedly provided on the adjusting seat 2. Two guide rods 22 are fixedly provided on the collapsible bracket 21. The two guide rods 22 are symmetrically arranged on both sides of the transmission shaft 12, and both guide rods 22 are parallel to the transmission shaft 12.

[0035] The collapsible assembly 3 includes a nut frame 31 that is relatively slidably disposed on the adjusting seat 2. The nut frame 31 includes slider portions protruding on both sides. Each slider portion forms a guide rail slider pair with a guide rod 22, thereby supporting both sides of the nut frame 31 and preventing the nut frame 31 from rotating synchronously when sliding. A nut 32 is fixedly disposed in the nut frame 31. The transmission shaft 12 includes a threaded section that is threadedly connected to the nut 32. The rotation of the transmission shaft 12 drives the nut 32 and the nut frame 31 to move axially along the transmission shaft 12.

[0036] Sliding members 33 are symmetrically arranged on both sides of the drive shaft 12. The sliding members 33 are rotatably mounted on the nut frame 31 through the rotation fulcrum 36. Specifically, each sliding member 33 is rotatably connected to the slider part of the nut frame 31 through the rotation fulcrum 36. Two limiting rods 34 are fixedly arranged on the collapsible bracket 21. Each limiting rod 34 corresponds to a sliding member 33. A strip hole 331 is opened on the sliding member 33. The limiting rod 34 passes through and is movably arranged in the strip hole 331. The limiting rod 34 can slide relative to each other in the strip hole 331.

[0037] A telescopic elastic element 35 is also provided between the two sliding elements 33. In this embodiment, the telescopic elastic element 35 is selected as a tension spring. The two ends of the tension spring are respectively fixed on the two sliding elements 33, and the fixing point is located outside the rotation fulcrum 36 of each sliding element 33. Preferably, the telescopic elastic element 35 is fixed to the two ends of the two sliding elements 33 by a telescopic elastic element hanging trunnion, and is symmetrically arranged with the transmission shaft 12 as the axis of symmetry to ensure force balance and synchronous movement.

[0038] When the nut bracket 31 slides relative to the adjusting seat 2, the limiting rod 34 slides in the strip hole 331 and abuts against the inner wall of the strip hole 331, pushing the sliding member 33 to rotate around the rotation fulcrum 36, and the telescopic elastic member 35 is stretched and deformed, and its elastic force direction forms a perpendicular angle with the axial straight line of the transmission shaft 12.

[0039] The kneading shaft 13 includes a transmission section 132 and two inclined sections 131 located at both ends of the transmission section 132. The central axis of the inclined section 131 has an inclination angle with the central axis of the transmission section 132. Each inclined section 131 is rotatably equipped with a contact arm 4 and a kneading arm 5.

[0040] The adjusting base 2 is provided with a striking shaft 23 and a striking motor 24. The striking shaft 23 is rotatably mounted on the adjusting base 2, and the striking motor 24 is fixedly mounted on the adjusting base 2. The striking shaft 23 includes a middle section 231 and eccentric sections 232 disposed on both sides of the middle section 231. The middle section 231 is connected to the output end of the striking motor 24.

[0041] The collapse assembly 3 also includes a connecting rod 41. One end of the connecting rod 41 is rotatably connected to the eccentric section 232 of the striking shaft 23, and the other end is hinged to the contact arm 4. To prevent the tilting rotation of the contact arm 4 from jamming the connecting rod 41, the connecting rod 41 includes a ball sleeve 411 and a connecting rod cover 412. The ball sleeve 411 is fixedly mounted on the eccentric section 232, and the connecting rod cover 412 is fixedly connected to the connecting rod 41. The ball sleeve 411 is accommodated within the connecting rod cover 412, forming a spherical movable fit with it, and the ball sleeve 411 rolls relative to the connecting rod cover 412. When the contact arm 4 swings axially with the rotation of the tilting section 131, the connecting rod 41 can swing axially along with it, ensuring that the impact force can be effectively transmitted to the collapse assembly 3.

[0042] In this embodiment, a linkage rod 51 is also hinged between the kneading arm 5 and the connecting rod 41. When the connecting rod 41 swings, the kneading arm 5 swings synchronously under the action of the linkage rod 51. When the connecting rod 41 drives the contact arm 4 to swing to adjust the angle or to perform a collapse action, the kneading arm 5 can be raised or lowered together through the linkage rod 51 to achieve overall collapse and angle adjustment.

[0043] The following combination Figures 4-5 The overall operating principle of this mechanism will be explained in detail: In normal working condition (angle adjustment), after the adjusting motor 11 is started, it drives the transmission shaft 12 to rotate. The threaded section on the transmission shaft 12 drives the nut 32 and its nut bracket 31 to move axially along the transmission shaft 12. When the nut bracket 31 moves, it drives the rotating fulcrum 36 connected to it to move together. Since the limiting rod 34 is fixed on the adjusting seat 2 and passes through the strip hole 331 of the sliding member 33, when the nut bracket 31 moves, the limiting rod 34 abuts against the inner wall of the strip hole 331, pushing the sliding member 33 to rotate around the rotating fulcrum 36.

[0044] The two sliding members 33 rotate symmetrically, stretching the telescopic elastic member 35 fixed between them, generating a pulling force. This pulling force is transmitted to the adjusting seat 2 through the sliding members 33 and the limiting rod 34, pushing the adjusting seat 2 to move synchronously relative to the mounting seat 1. The movement of the adjusting seat 2 drives the contact arm 4 to swing around the inclined section 131 via the connecting rod 41, changing the lifting angle of the contact arm 4 to change the angle and intensity of the massage. Figure 2 and Figure 5 A: Indicates normal working condition.

[0045] In this working state, when the kneading motor 14 drives the kneading shaft 13 to rotate, due to the angle between the central axis of the inclined section 131 and the central axis of the transmission section 132, the contact arm 4 and the kneading arm 5 not only rotate around the axis of the transmission section 132, but also rotate around their own axis on the inclined section 131. The combined action of the two simulates the kneading massage action of rolling and applying pressure in the center. When the tapping motor 24 drives the tapping shaft 23 to rotate, the connecting rod 41 swings back and forth through the eccentric section 232 to realize the tapping massage.

[0046] Collapse Action: When the contact arm 4 is subjected to an impact force from a person or other force, the impact force is transmitted to the connecting rod 41. The connecting rod 41 converts the force into a pushing or pulling force on the adjusting seat 2. Under the action of the impact force, the adjusting seat 2 is forced to slide away from the mounting seat 1. When the adjusting seat 2 moves, it drives the limiting rod 34 to move together. However, the sliding member 33 is rotatably connected to the nut bracket 31. Due to the self-locking of the thread and the inertia of the motor, the position of the nut bracket 31 is locked, thereby locking the rotation fulcrum 36. The movement of the limiting rod 34 presses against and pushes the sliding member 33. 3. The element oscillates around the pivot point 36, causing both sliding members 33 to rotate symmetrically. This changes the distance between the two ends of the telescopic elastic member 35, resulting in the telescopic elastic member 35 being forcibly stretched. The angle between it and the axial line of the drive shaft increases. As the angle increases, the deformation of the telescopic elastic member 35 continuously increases. At this point, the elastic force can buffer the impact force. Until the direction of the elastic force of the telescopic elastic member 35 is perpendicular to the axial direction of the drive shaft 12, the telescopic elastic member 35 is stretched to its maximum length, the stored energy reaches its peak, and it is in a critical state. Figure 5In the critical state shown in section B, the sliding member 33 and the telescopic elastic member 35 are in a parallel state. If the impact force continues, the adjusting seat 2 will continue to slide, and the included angle will exceed the vertical critical point. The mechanical balance will be broken, and the energy stored in the deformed telescopic elastic member 35 will be released instantly. The telescopic elastic member 35 will move in the elastic reset direction. At this time, the reset elastic force will act as the force for the adjusting seat 2 to move away from the mounting seat 1. By squeezing and pushing the limit rod 34, the adjusting seat 2 will move quickly together with the impact force. After the contact arm 4 loses the elastic buffer force of the telescopic elastic member 35, the contact arm 4 will swing quickly to the flat position under the action of the connecting rod 41, reducing the lifting angle on the adjusting seat 2, completing the collapse, and greatly reducing the risk of injury to the occupants. Reset Action: After the collapse action is completed, contact arm 4 has retracted and flattened, the impact force has disappeared, and at this time the distance between adjusting seat 2 and mounting seat 1 reaches its maximum. Figure 3 and Figure 5 In the collapsed state shown in C, the mechanism is in a new stable state: the telescopic elastic member 35 is in a partially stretched state. After safety is determined, the adjusting motor 11 rotates, driving the transmission shaft 12 to rotate. Since the nut 32 is fixed in the nut bracket 31, the rotation of the transmission shaft 12 will drive the nut bracket 31 to move along the axis of the transmission shaft 12 towards the initial position. The movement of the nut bracket 31 will simultaneously pull the rotating fulcrum 36 connected to it to move together. Since the limiting rod 34 abuts against the sliding member 33, and the adjusting seat 2 and the mounting seat 1 are in a limit state due to the collapsed state, the position of the limiting rod 34 is locked. The movement of the nut bracket 31 will first drive the rotating fulcrum 36 to move. At the same time, the sliding member 33 rotates around the stationary limiting rod 34, thereby realizing the rotation of the sliding member 33, so that its tilt angle with the transmission shaft 12 gradually recovers to the initial angle. During this swinging process, the telescopic elastic element 35 is forced to deform and restarts its deformation and energy storage until it is perpendicular to the tilt angle of the drive shaft. This is the critical state. Then, the nut bracket 31 continues to slide, continuing to push the sliding element 33 to rotate, so that the tilt angle between the telescopic elastic element 35 and the drive shaft 12 continues to change. The telescopic elastic element 35 releases energy again to reset. At this time, the nut 32 is controlled by the adjusting motor 11, and the elastic force pushes the adjusting seat 2 to move in the opposite direction. The distance between the adjusting seat 2 and the mounting seat 1 decreases, and the contact arm 4 is driven by the connecting rod 41 to lift up again. After resetting, the adjusting seat 2 and the nut bracket 31 are locked again by the elastic force of the telescopic elastic element 35. At this time, the adjusting motor 11 is rotated in the opposite direction again, and the above angle adjustment is repeated. Adjusting the lifting angle of the contact arm 4 completes the reset.

Claims

1. A symmetrically stabilizing and collapsible mechanism, comprising a mounting base (1), an adjusting base (2), and a contact arm (4), wherein the contact arm (4) is rotatably mounted on the mounting base (1), and an adjusting motor (11) is fixedly mounted on the mounting base (1) and a transmission shaft (12) is rotatably mounted on the mounting base (1), wherein the output end of the adjusting motor (11) drives the transmission shaft (12) to rotate, and the mounting base (1) and the adjusting base (2) are axially sliding relative to each other along the transmission shaft (12), characterized in that: The adjusting seat (2) is provided with a collapsible assembly (3), the collapsible assembly (3) includes a nut bracket (31) slidably disposed on the adjusting seat (2), a nut (32) is fixed or integrally disposed in the nut bracket (31), the transmission shaft (22) includes a threaded section that is threadedly connected to the nut (32), the transmission shaft (22) rotates and drives the nut (32) and the nut bracket (31) to move axially along the transmission shaft (22); The collapsible assembly (3) also includes sliding members (33) symmetrically arranged on both sides of the transmission shaft (12). The sliding members (33) are rotatably mounted on the nut frame (31) through the rotation fulcrum (36). Two limiting rods (34) are fixedly arranged on the adjusting seat (2). Each limiting rod (34) is slidably arranged on a sliding member (33). A telescopic elastic member (35) is also provided between the two sliding members (33). The two ends of the telescopic elastic member (35) are fixed on the two sliding members (33) respectively, and the fixing point is located outside the rotation fulcrum (36) of each sliding member (33). When the mounting base (1) and the adjusting base (2) move relative to each other, the limiting rod (34) slides and pushes the sliding member (33) to rotate around the rotation fulcrum (36), and the telescopic elastic member (35) is stretched or compressed. The collapse assembly (3) also includes a connecting rod (41), one end of which is rotatably mounted on the adjusting seat (2) and the other end is hinged to the contact arm (4). When the mounting seat (1) and the adjusting seat (2) slide relative to each other, the contact arm (41) swings under the action of the connecting rod (41).

2. The symmetrically stabilized collapsible mechanism according to claim 1, characterized in that: Two guide rods (22) are fixedly arranged on the adjusting seat (2). The two guide rods (22) are symmetrically arranged on both sides of the transmission shaft (12). Both guide rods (22) are parallel to the transmission shaft (12). The two sides of the nut frame (31) are slidably connected to a guide rod (22). When the nut frame (31) slides relative to the adjusting seat (2), the rotation fulcrum (36) of the two sliding parts (33) slides along the axial direction of the guide rod (22).

3. A symmetrically stabilized collapsible mechanism according to claim 1 or 2, characterized in that: The sliding member (33) is provided with a strip hole (331). The limiting rod (34) passes through and is movably disposed in the strip hole (331). When the mounting seat (1) and the adjusting seat (2) move relative to each other, the limiting rod (34) slides in the strip hole (331) and presses against the inner wall of the strip hole (331) to push the sliding member (33) to rotate around the rotation fulcrum (36).

4. A symmetrically stabilized collapsible mechanism according to claim 1 or 2, characterized in that: The telescopic elastic element (35) is fixed at both ends on the two sliding elements (33) and is symmetrically arranged with the transmission shaft (12) as the axis of symmetry.

5. A symmetrically stabilized collapsible mechanism according to claim 1 or 2, characterized in that: A kneading shaft (13) is rotatably mounted on the mounting base (1). The kneading shaft (13) includes a transmission section (132) and two inclined sections (131) located at both ends of the transmission section (132). The central axis of the inclined section (131) has an inclination angle with the central axis of the transmission section (132). The contact arm (4) is rotatably mounted on the inclined section (131). A kneading motor (14) is also mounted on the mounting base (1). The output end of the kneading motor (14) is connected to the transmission section (132) to drive the kneading shaft (13) to rotate.

6. The symmetrically stabilized collapsible mechanism according to claim 5, characterized in that: A kneading arm (5) is rotatably mounted on the inclined section (131). A linkage rod (51) is hinged between the kneading arm (5) and the connecting rod (41). When the connecting rod (41) swings, the kneading arm (5) swings synchronously under the action of the linkage rod (51).

7. The symmetrically stabilized collapsible mechanism according to claim 6, characterized in that: The adjusting seat (2) is provided with a striking shaft (23) and a striking motor (24). The striking shaft (23) is rotatably mounted on the adjusting seat (2), and the striking motor (24) is fixedly mounted on the adjusting seat (2). The striking shaft (23) includes a middle section (231) and eccentric sections (232) on both sides of the middle section (231). The connecting rod (41) is rotatably mounted on the eccentric section (232). The middle section (231) is connected to the output end of the striking motor (24).

8. A symmetrically stabilized collapsible mechanism according to claim 7, characterized in that: The connecting rod (41) includes a ball sleeve (411) and a connecting rod cap (412). The ball sleeve (411) is fixedly mounted on the eccentric section (232). The connecting rod cap (412) is fixedly connected to the connecting rod (41). The ball sleeve (411) is accommodated in the connecting rod cap (412) to form a spherical movable fit with it.

9. A symmetrically stabilized collapsible mechanism according to claim 1 or 2, characterized in that: At least one bearing seat (15) is fixedly provided on the mounting base (1), and each bearing seat (15) is rotatably connected to the transmission shaft (12) through a bearing.

10. A symmetrically stabilized collapsible mechanism according to claim 6, characterized in that: Both inclined sections (131) are rotatably equipped with contact arms (4) and kneading arms (5). Each contact arm (4) is connected to the striking shaft (23) by a connecting rod (41), and each connecting rod (41) is connected to the corresponding kneading arm (5) by a linkage rod (51).

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