CN110920939B

CN110920939B - Power assisting device

Info

Publication number: CN110920939B
Application number: CN201911206335.8A
Authority: CN
Inventors: 张鹏; 苏南; 许志伟; 王旭海; 张志成; 何梦蝶
Original assignee: Beijing Space Technology Research and Test Center
Current assignee: Beijing Space Technology Research and Test Center
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2021-06-18
Anticipated expiration: 2039-11-29
Also published as: CN110920939A

Abstract

The invention relates to a booster unit, characterized by comprising: fixed fixture (1), one end with length adjustment mechanism (2) that fixed fixture (1) is connected and with terminal assist drive device (3) that the other end of length adjustment mechanism (2) is connected, fixed fixture (1) with adopt universal ball joint structure (4) that have locking function to connect between length adjustment mechanism (2), length adjustment mechanism (2) with adopt universal joint structure (5) to connect between terminal assist drive device (3). The power assisting device can be firmly fixed on the bulkhead power assisting handrail and can adapt to the examination and maintenance angle of astronauts.

Description

Power assisting device

Technical Field

The invention relates to the field of auxiliary devices for extravehicular activities of astronauts, in particular to a power assisting device.

Background

With the development of aerospace technology, particularly space station technology, extravehicular activities of astronauts tend to be normalized. All extravehicular activities of astronauts are completed by means of a series of auxiliary devices under the influence of factors such as space microgravity environment, aerospace suit negative pressure environment, safety and the like.

One important content of extravehicular activities of astronauts is extravehicular equipment maintenance, and force application (assistance) points need to be provided for astronauts in a weightless state to finish equipment maintenance operation. In general, the astronauts apply (assist) force by the bulkhead assist handrails, but the positions, angles, heights, and the like of the bulkhead assist handrails cannot be adapted to the operation postures of the astronauts, so that the astronauts cannot apply (assist) force.

Disclosure of Invention

The present invention is made to solve the above problems, and an object of the present invention is to provide a booster.

To achieve the above object, the present invention provides a booster including:

fixed fixture, one end with the length adjustment mechanism that fixed fixture connects and with the terminal assist drive device that length adjustment mechanism's the other end is connected, fixed fixture with adopt the universal ball joint structural connection that has the locking function between the length adjustment mechanism, length adjustment mechanism with adopt universal joint structural connection between the terminal assist drive device.

According to one aspect of the invention, the universal ball joint structure comprises a ball head arranged at the end part of the length adjusting mechanism, an arc-shaped groove arranged at the end part of the fixed clamping mechanism and movably connected with the ball head, a locking piece arranged on the arc-shaped groove and used for locking the ball head and the arc-shaped groove, and a damping piece arranged in the arc-shaped groove and used for increasing friction force to control the position of the ball head in the arc-shaped groove.

According to one aspect of the invention, the locking piece comprises a locking handle in threaded connection with the opening in the arc-shaped groove, and an arc-shaped pressing plate which is fixedly connected with the locking handle and is positioned in the arc-shaped groove and matched with the outer surface of the ball head in shape.

According to one aspect of the invention, the fixed clamping mechanism comprises an anti-slip handle connected with the arc-shaped groove, a bracket connected with the anti-slip handle, a clamping piece connected with the bracket, and a locking plate connected with the end part of the clamping piece and used for locking the clamping piece.

According to one aspect of the invention, the clamping piece comprises a fixed clamp fixedly connected with the bracket, a rotating clamp positioned on one side of the fixed clamp and rotatably connected with the bracket, and a pressure spring arranged between the rotating clamp and the bracket and used for resetting the rotating clamp after rotation;

the locking plate is rotatably connected with the end part of the fixing clamp, and the fixing clamp and the rotating clamp can be locked together through rotation.

According to one aspect of the invention, the length adjusting mechanism comprises an inner adjusting rod fixedly connected with the ball head, an outer adjusting rod sleeved outside the inner adjusting rod and capable of moving back and forth relative to the inner adjusting rod, and a switch structure arranged on the outer adjusting rod and used for locking or unlocking the relative position between the inner adjusting rod and the outer adjusting rod.

According to one aspect of the present invention, the inner adjustment lever is provided with a plurality of fixing holes, and the switch structure includes a housing supported on the outer adjustment lever, a locking pin reciprocally movable in the housing, and a cam handle rotatably connected to one end of the locking pin outside the housing for controlling the locking pin to be inserted into or separated from the fixing holes.

According to one aspect of the invention, the housing comprises a main body and a cover plate positioned on the main body, the locking pin comprises a mounting end and a latch end, the mounting end penetrates through the cover plate and is rotatably connected with the cam end of the cam handle, the latch end is positioned in the main body, and an elastic piece used for matching with the cam handle to control the locking pin to reciprocate is arranged between the latch end and the cover plate.

According to one aspect of the invention, the length adjustment mechanism includes an armrest disposed on the outer adjustment rod.

According to one aspect of the present invention, the universal joint structure includes a ball socket and a second ball head;

the spherical groove is fixedly connected with the end part of the outer adjusting rod;

the tail end power assisting mechanism comprises a tail end handrail and a connecting rod connected with the tail end handrail;

the second ball head is fixedly connected with the connecting rod.

According to one scheme of the invention, the fixed clamp in the clamping piece is fixed on the support, the rotating clamp is hinged on the support, and the pressure spring is arranged between the rotating clamp and the support. The clamping piece can be firmly clamped on the bulkhead power assisting handrail, so that the whole power assisting device is fixed. After the bulkhead handrail is tightened, the locking plate is rotated by 90 degrees to lock the clamping piece. The two sides of the anti-skid handle are provided with a plurality of arc-shaped depressions which are arranged at equal intervals, so that the friction force can be increased, and the anti-skid function is achieved. After the fixed clamp and the rotating clamp are closed, a space formed by four arc-shaped grooves which are arranged at equal intervals in the circumferential direction is formed, so that the clamping piece can clamp the bulkhead power-assisted handrail from two vertical angles.

According to one scheme of the invention, the fixed clamping mechanism and the length adjusting mechanism are connected through a universal ball joint structure. The ball head of the universal ball head joint structure is positioned in the arc-shaped groove and can freely rotate in the arc-shaped groove. So that the length adjustment mechanism can also rotate freely, and the astronaut can press the ball head through the locking piece, thereby locking the length adjustment mechanism to prevent the length adjustment mechanism from rotating. And the damping piece positioned in the arc-shaped groove can automatically stop rotating by means of the friction force between the damping piece and the ball head after the length adjusting mechanism rotates in place.

According to one aspect of the present invention, the outer adjusting rod is sleeved on the inner adjusting rod in a reciprocating manner, and the inner adjusting rod is provided with a plurality of fixing holes. And the outer adjusting rod is provided with a switch structure. The astronaut can make the locking pin hinged with the astronaut do reciprocating linear motion by toggling the cam handle in the switch structure, thereby switching between two states of being positioned in the fixed hole and being separated from the fixed hole to finish the length adjustment and locking.

According to one scheme of the invention, the length adjusting mechanism and the tail end power assisting mechanism are connected through a universal joint mechanism, and the universal joint mechanism is similar to a universal ball joint mechanism and is also a mechanism similar to a joint. So that the end main force mechanism can also freely rotate. And the link is rotatably coupled to the end armrest such that the end armrest is rotatable about the link axis. The booster device can adapt to the force application or boosting of various maintenance postures of astronauts by matching with a joint structure formed by the universal ball joint mechanism.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a perspective view schematically illustrating a booster according to a first embodiment of the present invention;

fig. 2 is a perspective view schematically showing a fixed clamp mechanism according to a first embodiment of the present invention;

FIGS. 3, 4 and 5 are sectional views schematically showing a full open state, an unlocked state and a locked state of a fixed clamp mechanism according to a first embodiment of the present invention, respectively;

FIG. 6 is a perspective view schematically showing a length adjustment mechanism according to a first embodiment of the present invention;

fig. 7 and 8 are sectional views schematically showing a locked state and an unlocked state of the switching mechanism according to the first embodiment of the present invention, respectively;

fig. 9 is a perspective view schematically showing an end assist mechanism according to a first embodiment of the invention;

fig. 10 is a sectional view schematically showing a ball joint structure with a locking function according to a first embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.

The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.

Fig. 1 is a perspective view schematically showing a booster according to a first embodiment of the present invention. As shown in fig. 1, the booster of the present invention includes: the device comprises a fixed clamping mechanism 1, a length adjusting mechanism 2 and a tail end assisting mechanism 3. The fixed clamping mechanism 1 can be firmly fixed on the bulkhead power-assisted handrail, the length adjusting mechanism 2 can adjust the axial length, and the tail end power-assisted mechanism 3 provides a holding part for astronauts. The fixed clamping mechanism 1 is connected with the length adjusting mechanism 2 through a universal ball joint structure 4, and the structure has a locking function. The length adjusting mechanism 2 and the tail end assisting mechanism 3 are connected through a universal joint structure 5.

Fig. 2 is a perspective view schematically showing a fixed clamp mechanism according to a first embodiment of the present invention. As shown in fig. 2, the fixed clamp mechanism 1 includes an anti-slip handle 101, a bracket 102, a clamp 103, and a lock plate 104. The anti-slip handle 101 is a strip-shaped rod, and a plurality of arc-shaped depressions arranged at intervals are arranged on two sides of the anti-slip handle, so that friction force can be increased, and the anti-slip handle is not easy to slip when being held by a astronaut. The two ends of the anti-skid handle 101 are respectively connected with the universal ball joint structure 4 and the bracket 102. The bracket 102 is mainly used to support the clamp 103 and the lock plate 104. The clamp 103 is a combination comprising a fixing clamp 1031, a rotating clamp 1032 and a compression spring 1033. The fixing clip 1031 is fixedly connected to the bracket 102, and the rotating clip 1032 is hinged to the bracket 102. The retaining clip 1031 is on the lower side and the rotating clip 1032 is on the upper side, both of which are connected to the bracket 102 at a central location with the ends substantially aligned. Therefore, the fixing clamp 1031 and the rotating clamp 1032 form a clamp-like structure, and can be clamped on the bulkhead power assisting handrail to realize the fixation of the whole power assisting device. A pressure spring 1033 is provided between the rotating clip 1032 and the bracket 102, and can be restored and tightened by an elastic force after the astronaut operates the rotating clip 1032 to rotate.

Fig. 3, 4 and 5 are sectional views schematically showing a fully opened state, an unlocked state and a locked state of the fixed clamp mechanism according to the first embodiment of the present invention, respectively. In conjunction with these three figures, to facilitate the operation of the astronaut, the end of the rotating clamp 1032 near the frame 102 is tilted upward and to the right, and the upper side is flat. This facilitates the astronaut to hold the anti-slip handle 101 and rotate the rotating clamp 1032 by pressing it down with the thumb, thereby bringing the clamp 103 into the open state. The fixing clip 1031 and the rotating clip 1032 are arc-shaped wall plates at the ends far away from the bracket 102. The facing sides of the two curved walls form a space for accommodating the bulkhead assist handle a when the clamp 103 is in the closed position. The space is composed of four arc-shaped grooves which are arranged at equal intervals along the circumferential direction, and the design is suitable for the characteristic that the cross sections of the conventional bulkhead boosting handrail A are all long circular sections as shown in figure 3. While the curved wall of the rotating clamp 1032 for defining the space for accommodating the bulkhead assist handle a is of a two-piece construction. As shown in fig. 4, when the bulkhead assist handrail a is placed perpendicular to the bracket 102 in the space between the fixing clip 1031 and the rotating clip 1032, both ends of the handrail a are caught in the upper and lower circular arc-shaped grooves of the space. As shown in fig. 5, when the bulkhead assistant arm rest a is placed in a space between the fixing clip 1031 and the rotating clip 1032 in parallel with the bracket 102, both ends of the bulkhead assistant arm rest a are caught in the left and right circular arc-shaped grooves of the space. The locking plate 104 is divided into two parts, one part is thin, and the rotation of astronauts is facilitated; the other part is thicker and hollow, and a plurality of grooves which are arranged alternately are arranged on the upper side in the figure 3. A thicker portion of the locking plate 104 is hinged at an end of the retaining clip 1031 remote from the bracket 102. As can be seen in fig. 2, the end of the rotating clamp 1032 remote from the bracket 102 is of a flat tooth-type configuration (not shown), the teeth being sized and numbered to correspond exactly to the slots in the thicker portion of the locking plate 104. With reference to fig. 4 and 5, when locking, the astronaut pulls up the thinner portion of the locking plate 104 to rotate clockwise, and when rotating 90 °, the tooth-shaped structure of the end of the rotating clip 1032 far from the bracket 102 is inserted into the slot of the thicker portion of the locking plate 104, so as to press the rotating clip 1032, thereby achieving the purpose of locking the clamping member 103.

Fig. 6 is a perspective view schematically showing a length adjustment mechanism according to a first embodiment of the present invention. As shown in fig. 6, the length adjustment mechanism 2 includes an inner adjustment lever 201, an outer adjustment lever 202, and a switch structure 203. The inner adjusting rod 201 is a hollow rectangular rod, two opposite side walls of the inner adjusting rod are provided with a plurality of fixing holes 2011 which are arranged in a straight line at equal intervals, and each two opposite fixing holes 2011 are a length adjusting gear. The outer adjusting rod 202 is also a hollow rectangular rod, and the inner hole of the outer adjusting rod is a rectangular hole with the same rectangular outline as the outer shape of the inner adjusting rod 201. The outer adjustment rod 202 is open at one end and the inner adjustment rod 201 is inserted into the inner bore of the outer adjustment rod 202 from this opening. And the outer adjusting rod 202 can be sleeved outside the inner adjusting rod 201 to do linear reciprocating movement, so that gear shifting is completed. In order to make the astronaut judge the gear more clearly, as shown in fig. 6, an annular groove axially surrounding the outer wall of the inner adjusting rod 201 is arranged on the outer wall of the inner adjusting rod 201 between two fixing holes 2011 on the same side wall. In addition, a handrail 204 is further disposed at a middle position of an outer wall of the outer adjusting rod 202. The armrest 204 is an open rectangular frame structure that includes two short side beams and a long side beam. The ends of the two short side beams remote from the long side beam are connected to a side wall of the outer adjustment bar 202 to form a closed rectangle. When adjusting the length, the astronaut holds the armrest 204 and pulls or pushes outward to move the outer adjustment rod 202 away from or close to the bulkhead assist armrest a. Therefore, the power assisting device can adapt to the cabin wall power assisting handrails with different heights.

The switch structure 203 is disposed on opposite sidewalls of the outer adjustment stem 202 near the open end. Fig. 7 and 8 are sectional views showing a locked state and an unlocked state of the switching mechanism according to the first embodiment of the present invention, respectively. Referring to fig. 7 and 8, the switch structures 203 are symmetrically disposed on the upper and lower sidewalls of the outer adjustment lever 202, and therefore, only the upper switch structure 203 will be described as an example of the specific composition of the structure. The switch structure 203 includes a housing 2031, a locking pin 2032, a cam handle 2033, and a resilient member 2034. The housing 2031 includes a main body 2031a and a cover plate 2031 b. The body 2031a is integrally formed with the outer lever 202 and extends distally from the outer lever 202 side wall to form a cubic boss. The cover 2031b is a flat plate and is fixed to the top of the main body 2031a by screws. The main body 2031a and the cover plate 2031b are provided with through holes at the centers thereof, but the through holes in the main body 2031a are relatively large in size. The locking pin 2032 is of a cylindrical pin-like construction and comprises two portions, a smaller diameter mounting end 2032a and a larger diameter plug end 2032 b. Wherein the latch end 2032b is located in a through bore of the body 2031a and is movable up and down therein. And mounting end 2032a extends from the top of latch end 2032b up through a through hole in cover plate 2031 b. Cam handle 2033 is a plate having a large thickness at the right end in fig. 7, so that cam handle 2033 has a structure with a thin plate at the left end and a block at the right end. And the width of the end of the sheet at the left end of the cam handle 2033, which is far away from the block, is large, which is convenient for the astronaut to rotate the cam handle 2033. The mounting end 2032a of the locking pin 2032 is hinged to a block at the thicker end of the cam handle 2033, but near the point of attachment of the lamella to the block. Thus, when the cam handle 2033 is rotated, the locking pin 2032 can move linearly up and down. The elastic member 2034 is a spring, and is sleeved on the mounting end 2032a of the locking pin 2032.

As shown in fig. 7, in the switch structure 203, in the locked state, the latch ends 2032b of the upper and lower locking pins 2032 respectively pass through two opposite fixing holes 2011 of the inner adjustment lever 201. And a cam handle 2033 is supported on the cover plate 2031 parallel to the outer adjustment rod 202. The outer adjustment lever 202 cannot move at this time. When unlocking, the astronaut rotates the cam handle 2033 clockwise, at this time, the locking pin 2032 moves upward, and the elastic member 2043 compresses tightly. When the cam handle 2033 is rotated 90 °, as shown in fig. 8, the bolt end 2032b of the locking pin 2032 is completely separated from the fixing hole 2011 of the inner adjustment lever 201, and the unlocking is completed. At this time, since the bottom surface of the block of the cam handle 2033 is a plane perpendicular to the left side surface of the cam handle 2033 in fig. 8, the cam handle 2033 can be stably supported on the cover plate 2031b after unlocking. When locking again, the astronaut only needs to dial the cam handle 2033 counterclockwise, the elastic element 2033 pushes the locking pin 2032 back to the fixing hole 2011 on the inner adjusting rod 201 automatically by means of elasticity, and the cam handle 2033 is rotated back to the position parallel to the outer adjusting rod 202.

Fig. 9 is a perspective view schematically showing an end assist mechanism according to a first embodiment of the present invention. As shown in fig. 9, the terminal assist mechanism 3 includes a terminal handrail 301 and a link 302. The end rail 301 is also a rectangular frame, consisting of two long side beams and two short side beams. The link 302 is a cylindrical rod member which is rotatably inserted into one long side beam of the end handrail 301, and the joint of the long side beam and the two short side beams is arc-shaped. Thereby, the end armrest 301 can rotate about the axis of the link 302. Referring to fig. 6, universal joint structure 5 includes a ball socket 501 and a second ball head 502. The spherical recess 501 is a two-part hollow shell, one part of which is a frustoconical shell and the other part of which is a segment of a spherical shell extending away from the base of the frustoconical shell. The apex of the frusto-conical housing is fixed to the non-open end of the outer adjustment rod 202. And the spherical shell portion of the spherical groove 501 is provided with an opening at the end remote from the outer adjustment rod 202. As shown in fig. 9, a second ball 502 is fixed to an end of the link 302 remote from the end armrest 301. Which is disposed in the spherical groove 501 and is freely rotatable, so that the universal joint structure 5 forms a joint-like structure.

Referring to fig. 2 and 6, universal ball joint structure 4 includes a ball 401, an arcuate slot 402, a retaining member 403, and a damping member 404 (see fig. 10). As shown in fig. 2, the arc-shaped slot 402 is a spherical shell that is fixed at the end of the anti-slip handle 101 away from the bracket 102. The end of the arc-shaped groove 402 away from the anti-skid handle 101 is provided with an opening, and both sides of the arc-shaped groove 402 are provided with openings 4021 (see fig. 10), and the openings 4021 are threaded holes. As shown in fig. 6, the ball head 401 is fixed to an end of the inner adjustment rod 201, which is not inserted into the outer adjustment rod 202, by a cylindrical rod. Also, a ball 401 is disposed within the arcuate slot 402 for free rotation therein. The universal ball joint structure 4 thus also forms a joint-like structure.

Fig. 10 is a sectional view schematically showing a ball joint structure with a locking function according to a first embodiment of the present invention. As shown in fig. 10, retaining member 403 includes a retaining handle 4031 and an arcuate platen 4032. Locking handle 4031 is comprised of two legs, a first leg attached perpendicularly to the middle of a second leg such that locking handle 4031 forms a "T" shaped structure. An arcuate plate 4032 is located on the end of the first beam remote from the second beam and has an arc that conforms to the surface of the ball head 401. The first rod is provided with external threads that mate with threaded holes in the arcuate slot 402. Thus, by rotating the second lever, retaining member 403 can be moved either inward or outward of arcuate slot 402. And one retaining member 403 is disposed in each of the two threaded holes of the arcuate slot 402. The arc-shaped groove 402 is also provided with a cylindrical groove extending towards the anti-skid handle 101 at a position close to the connection of the anti-skid handle 101. The damping member 404 is disposed therein, and a spring 405 is further sleeved outside the damping member 404. Therefore, under the space weightless environment, the length adjusting mechanism 2 rotates to drive the ball head 401 to rotate, and can be stopped immediately by means of the friction force between the damping piece 404 and the ball head 401 after being in place, and in the process, the spring 405 also plays a role in pressing the ball head 401. After rotating in place, the astronaut can rotate the two locking handles 4031 to enable the two arc-shaped plates 4032 to press the ball head 401 from two opposite sides of the ball head 401, so that locking is completed, and the ball head 401 cannot rotate any more.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A booster device for assisting extravehicular activity of an astronaut, comprising: fixed fixture (1), one end with length adjustment mechanism (2) that fixed fixture (1) is connected and with terminal assist drive device (3) that the other end of length adjustment mechanism (2) is connected, fixed fixture (1) with adopt universal ball joint structure (4) that have locking function to connect between length adjustment mechanism (2), length adjustment mechanism (2) with adopt universal joint structure (5) to connect between terminal assist drive device (3).

2. The booster of claim 1, wherein the universal ball joint structure (4) comprises a ball head (401) arranged at an end of the length adjustment mechanism (2), an arc-shaped groove (402) arranged at an end of the fixed clamping mechanism (1) and movably connected with the ball head (401), a locking member (403) arranged on the arc-shaped groove (402) and used for locking the ball head (401) and the arc-shaped groove (402), and a damping member (404) arranged in the arc-shaped groove (402) and used for increasing friction force to control the position of the ball head (401) in the arc-shaped groove (402).

3. The force assist device of claim 2 wherein the retaining member (403) includes a retaining handle (4031) threadably coupled to an opening (4021) in the arcuate slot (402), and an arcuate pressure plate (4032) fixedly coupled to the retaining handle (4031) and positioned within the arcuate slot (402) to form fit with an outer surface of the ball head (401).

4. The booster of claim 3, wherein the fixed clamping mechanism (1) comprises an anti-slip handle (101) connected to the arcuate slot (402), a bracket (102) connected to the anti-slip handle, a clamping member (103) connected to the bracket (102), and a locking plate (104) connected to an end of the clamping member (103) for locking the clamping member (103).

5. The booster of claim 4, wherein the clamping member (103) comprises a fixed clamp (1031) fixedly connected to the bracket (102), a rotating clamp (1032) rotatably connected to the bracket (102) at one side of the fixed clamp (1031), and a pressure spring (1033) provided between the rotating clamp (1032) and the bracket (102) for returning the rotating clamp (1032) after rotation;

the locking plate (104) is rotatably connected with the end of the fixing clip (1031), and the fixing clip (1031) and the rotating clip (1032) can be locked together through rotation.

6. The booster of claim 5, wherein the length adjustment mechanism (2) comprises an inner adjustment rod (201) fixedly connected with the ball head (401), an outer adjustment rod (202) sleeved outside the inner adjustment rod (201) and capable of reciprocating relative to the inner adjustment rod (201), and a switch structure (203) arranged on the outer adjustment rod (202) for locking or unlocking the relative position between the inner adjustment rod (201) and the outer adjustment rod (202).

7. The booster of claim 6, wherein the inner adjustment lever (201) is provided with a plurality of fixing holes (2011), the switch structure (203) comprises a housing (2031) supported on the outer adjustment lever (202), a locking pin (2032) reciprocally movable in the housing (2031), and a cam handle (2033) rotatably connected to one end of the locking pin (2032) and located outside the housing (2031) for controlling the insertion of the locking pin (2032) into the fixing holes (2011) or the disengagement of the locking pin (2032) from the fixing holes (2011).

8. The booster of claim 7, wherein the housing (2031) comprises a main body (2031a) and a cover plate (2031b) located above the main body (2031a), the locking pin (2032) comprises a mounting end (2032a) and a latch end (2032b), the mounting end (2032a) passes through the cover plate (2031b) to be rotatably connected with the cam end of the cam handle (2033), the latch end (2032b) is located in the main body (2031a), and an elastic member (2034) for cooperating with the cam handle (2033) to control the reciprocating movement of the locking pin (2032) is arranged between the cover plate (2031 b).

9. The force assist arrangement of claim 8, wherein the length adjustment mechanism (2) includes a hand rest (204) disposed on the outer adjustment lever (202).

10. The booster of claim 9 wherein the universal joint arrangement (5) comprises a spherical groove (501) and a second bulb (502);

the spherical groove (501) is fixedly connected with the end part of the outer adjusting rod (202);

the tail end power assisting mechanism (3) comprises a tail end handrail (301) and a connecting rod (302) connected with the tail end handrail (301);

the second ball head (502) is fixedly connected with the connecting rod (302).