CN215538139U - Treadmill with synchronously foldable instrument handrail and upright post - Google Patents

Abstract

The utility model discloses a treadmill with synchronously foldable instrument handrails and upright columns, which comprises a running platform assembly, upright column assemblies and instrument handrail assemblies, wherein the upright column assemblies are symmetrically arranged on two sides of the running platform assembly, the instrument handrail assemblies are movably arranged at the upper ends of the upright column assemblies, the instrument handrail assemblies can be folded relative to the upright column assemblies, and the upright column assemblies can be folded relative to the running platform assemblies, so that the opposite column assemblies and the instrument handrail assemblies are synchronously folded, the storage is convenient, and the space occupation is reduced.

Description

Treadmill with synchronously foldable instrument handrail and upright post

Technical Field

The utility model relates to the technical field of fitness equipment, in particular to a treadmill with synchronously foldable instrument handrails and upright posts.

Background

Modern people are generally lack of exercise due to busy lives. Running is the sport of choice for many people because of its simplicity and efficiency. When the weather is not good, or in some time periods, the indoor treadmill is more convenient compared with running outdoors.

However, most of the traditional treadmills are not foldable, are inconvenient to store and occupy larger space, and the partially foldable treadmills are complicated in folding operation and can be folded only after screws are unscrewed, so that the treadmills which can be simply operated and can be folded are lacking in the market.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a treadmill with synchronously foldable instrument handrails and upright posts, and aims to solve the technical problems that most of the traditional treadmills in the background art are not foldable, inconvenient to store and occupy larger space, and a part of foldable treadmills are complicated to fold and can be folded after screws are unscrewed, so that the foldable treadmills which can be simply operated are unavailable in the market.

In order to achieve the purpose, the utility model provides the following technical scheme: the treadmill with synchronously foldable instrument handrails and upright columns comprises a running platform assembly, upright column assemblies and instrument handrail assemblies, wherein the upright column assemblies are symmetrically arranged on two sides of the running platform assembly, the instrument handrail assemblies are movably arranged at the upper ends of the upright column assemblies, the instrument handrail assemblies can be folded relative to the upright column assemblies, and the upright column assemblies can be folded relative to the running platform assemblies;

the instrument handrail assembly comprises an instrument desk, handrails and handrail connecting pieces, the handrails are symmetrically arranged on two sides of the instrument desk, the handrail connecting pieces are fixedly arranged at the lower ends of the handrails, an upper locking mechanism is installed at the upper end of the stand column assembly and is rotatably connected with the handrail connecting pieces, a lower locking mechanism is installed at the lower end of the stand column assembly and is rotatably connected with the running platform assembly.

Preferably, the stand subassembly includes stand, upper connecting piece and lower connecting piece, stand upper end and upper connecting piece welded fastening, stand lower extreme and lower connecting piece welded fastening.

Preferably, the upper locking mechanism comprises a driving seat, a pin sleeve groove, a slope, a first rotating shaft, a pin sleeve, a sliding groove, a handrail fixing pin, a split pin, a pin sleeve spring and a folding handle, the driving seat is rotatably mounted on the upper connecting piece through the first rotating shaft, the pin sleeve groove is arranged in the middle of the driving seat, the pin sleeve penetrates through the pin sleeve groove and is fixedly mounted on the upper connecting piece, the handrail fixing pin is mounted inside the pin sleeve, the split pin is fixedly mounted at one end of the handrail fixing pin, the through sliding groove is formed in the pin sleeve, two ends of the split pin extend out of the sliding groove, the pin sleeve spring is further mounted in the pin sleeve, one end of the pin sleeve spring is abutted against the handrail fixing pin, the other end of the pin sleeve is abutted against the top of the pin sleeve, the slopes are arranged on two sides of the pin sleeve groove, the slopes are abutted against two ends of the split pin, the driving seat is rotated, and can drive the split pin to move outwards or inwards on the sliding groove through the slopes, the other end of the handrail fixing pin can retract or extend from one side of the upper connecting piece, and a folding handle is further installed at one end of the driving seat.

Preferably, the upper connecting piece is further provided with a second rotating shaft, the handrail connecting piece is rotatably connected with the upper connecting piece through the second rotating shaft, the handrail connecting piece is provided with a first pin hole, and the handrail fixing pin can be inserted into the first pin hole to limit the rotation of the handrail connecting piece.

Preferably, the inner side of the upper connecting piece is provided with a limiting pin, the lower end of the handrail connecting piece is provided with a limiting groove, and the limiting pin can limit the clockwise or anticlockwise rotating angle of the handrail connecting piece.

Preferably, the lower end of the handrail connecting piece is further provided with a steel cable pull ring, the lower end of the upper connecting piece is welded with an upper steel cable sleeve seat, an upper steel cable sleeve is fixedly installed on the upper steel cable sleeve seat, and the upper steel cable sleeve is of a hollow structure.

Preferably, lower locking mechanism includes stand pivot, through-hole, stand pinhole, stand round pin, card post, lower wire rope cover and lower wire rope cover seat, stand pivot welded fastening is on the connector piece down, stand pivot center is provided with and supplies bolt male through-hole, the through-hole upper end is provided with the stand pinhole that link up, install the stand round pin in the stand round pin hole, stand round pin one end can be followed and stretch out or retract in the stand pinhole, the card post is installed to the stand round pin other end, wire rope cover seat is installed down in the stand pinhole outside, welded fastening has lower wire rope cover on the wire rope cover seat down, wire rope cover one end stretches into down in the stand round pin hole, install down the locking spring down between wire rope cover and the stand round pin down.

Preferably, the lower end of the steel cable pull ring is connected with a steel cable, and the steel cable penetrates through the upper steel cable sleeve and the lower steel cable sleeve downwards and then is fixedly connected with the clamping column.

Preferably, run a subassembly both sides and be provided with and run a socket, run and be provided with the second pinhole in the socket, the stand pivot passes through the bolt fastening and is in run a socket and can be in running a socket internal rotation, thereby the stand pin can insert the restriction of second pinhole the stand pivot is rotatory.

Compared with the prior art, the utility model has the beneficial effects that:

this treadmill that instrument handrail and stand can be folding in step, run platform subassembly bilateral symmetry and install the stand subassembly, stand subassembly upper end movable mounting has instrument handrail subassembly, instrument handrail subassembly can be folding relative to the stand subassembly, the stand subassembly can run platform subassembly folding relatively, instrument handrail subassembly includes the instrument desk, handrail and handrail connection piece, instrument desk bilateral symmetry is provided with the handrail, the fixed handrail connection piece that is provided with of handrail lower extreme, the locking mechanism is installed to stand subassembly upper end, it rotates with the handrail connection piece to go up locking mechanism and is connected, locking mechanism is installed down to stand subassembly lower extreme, lower locking mechanism rotates with running platform subassembly and is connected, thereby realize the synchronous folding of stand subassembly and instrument handrail subassembly, convenient storage, the reduction space occupies.

Drawings

FIG. 1 is a schematic structural view of the present invention in an overall open state;

FIG. 2 is a schematic structural view of the present invention in an overall folded state;

FIG. 3 is a schematic view of the running board assembly according to the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 according to the present invention;

FIG. 5 is a schematic view of the instrument arm rest assembly of the present invention;

FIG. 6 is a schematic overall side view of the present invention;

FIG. 7 is a cross-sectional view taken at A-A of FIG. 6 in accordance with the present invention;

FIG. 8 is an enlarged view of a portion of FIG. 7 at B in accordance with the present invention;

FIG. 9 is an enlarged view of a portion of FIG. 7 at C in accordance with the present invention;

FIG. 10 is a schematic view of the locking state of the upper and lower locking mechanisms of the present invention;

FIG. 11 is a schematic view of the locking state of the upper and lower locking mechanisms of the present invention;

FIG. 12 is a schematic view of the unlocked state of the upper and lower locking mechanisms of the present invention;

FIG. 13 is a schematic view of the unlocked state of the upper and lower locking mechanisms of the present invention;

FIG. 14 is a schematic view of a driving seat structure according to the present invention.

In the figure: 1. a treadmill assembly; 11. a treadmill socket; 111. a second pin hole; 2. a column assembly; 21. a column; 22. an upper connecting sheet; 221. a second rotating shaft; 222. a spacing pin; 23. a lower connecting sheet; 3. an instrument armrest assembly; 31. an instrument desk; 32. a handrail; 33. a handrail connecting sheet; 331. a first pin hole; 332. a limiting groove; 4. an upper locking mechanism; 41. a driving seat; 411. a pin sleeve slot; 412. a slope; 42. a first rotating shaft; 43. a pin bush; 431. a chute; 44. a handrail fixing pin; 45. a cotter pin; 46. a pin bush spring; 47. a folding handle; 5. a lower locking mechanism; 51. a column shaft; 52. a through hole; 53. column pin holes; 54. a column pin; 55. clamping the column; 56. a steel cable sleeve is arranged; 57. a lower steel cable sleeve seat; 58. a lower locking spring; 61. a steel cable pull ring; 62. a steel cable sleeve seat is arranged; 63. mounting a steel cable sleeve; 64. a steel cord.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: the treadmill with synchronously foldable instrument handrails and upright columns comprises a running platform component 1, upright column components 2 and instrument handrail components 3, wherein the upright column components 2 are symmetrically arranged at two sides of the running platform component 1, the instrument handrail components 3 are movably arranged at the upper ends of the upright column components 2, the instrument handrail components 3 can be folded relative to the upright column components 2, and the upright column components 2 can be folded relative to the running platform component 1; instrument handrail subassembly 3 includes instrument desk 31, handrail 32 and handrail connection piece 33, as shown in fig. 5, instrument desk 31 bilateral symmetry is provided with handrail 32, handrail 32 lower extreme is fixed to be provided with handrail connection piece 33, locking mechanism 4 is installed on 2 upper ends of stand subassembly, locking mechanism 4 rotates with handrail connection piece 33 to be connected, locking mechanism 5 is down installed to 2 lower extremes of stand subassembly, lower locking mechanism 5 rotates with running platform subassembly 1 to be connected, stand subassembly 2 includes stand 21, upper connecting piece 22 and lower connecting piece 23, stand 21 upper end and upper connecting piece 22 welded fastening, stand 21 lower extreme and lower connecting piece 23 welded fastening, thereby realize the synchronous folding of stand subassembly and instrument handrail subassembly, convenient storage, the space occupation is reduced.

As shown in fig. 10-13, the upper locking mechanism 4 includes a driving seat 41, a pin sleeve slot 411, a slope 412, a first rotating shaft 42, a pin sleeve 43, a sliding slot 431, a handrail fixing pin 44, a split pin 45, a pin sleeve spring 46 and a folding handle 47, the driving seat 41 is rotatably mounted on the upper connecting sheet 22 through the first rotating shaft 42, as shown in fig. 14, the pin sleeve slot 411 is provided in the middle of the driving seat 41, the pin sleeve 43 is fixedly mounted on the upper connecting sheet 22 through the pin sleeve slot 411, the handrail fixing pin 44 is mounted inside the pin sleeve 43, the split pin 45 is fixedly mounted at one end of the handrail fixing pin 44, the through sliding slot 431 is provided on the pin sleeve 43, both ends of the split pin 45 extend out from the sliding slot 431, the pin sleeve spring 46 is further mounted in the pin sleeve 43, one end of the pin sleeve spring 46 abuts against the fixing pin handrail 44, the other end abuts against the top of the pin sleeve 43, the slope 412 is provided on both sides of the pin sleeve slot 411, the slope 412 abuts against both ends of the split pin 45, the driving seat 41 is rotated, the cotter pin 45 can be driven to move outwards or inwards on the sliding groove 431 through the slope 412, the other end of the handrail fixing pin 44 can retract or extend out of one side of the upper connecting piece 22, the folding handle 47 is further installed at one end of the driving seat 41, the second rotating shaft 221 is further arranged on the upper connecting piece 22, the handrail connecting piece 33 is rotatably connected with the upper connecting piece 22 through the second rotating shaft 221, the first pin hole 331 is formed in the handrail connecting piece 33, the handrail fixing pin 44 can be inserted into the first pin hole 331 so as to limit the handrail connecting piece 33 to rotate, the folding handle 47 is lifted upwards to drive the driving seat 41 to rotate upwards, the cotter pin 45 moves outwards in the sliding groove 431 under the acting force of the slope 412, the handrail fixing pin 44 is driven to be separated from the first pin hole 331, and the instrument handrail assembly 3 can be rotated to be folded at the moment.

As shown in fig. 11 to 13, a limit pin 222 is installed inside the upper connection plate 22, a limit groove 332 is formed at the lower end of the armrest connection plate 33, the limit pin 222 can simultaneously limit the angle of clockwise or counterclockwise rotation of the armrest connection plate 33, when the instrument armrest assembly 3 is opened upward, the limit pin 222 contacts with the arc portion of the limit groove 332, so that the armrest fixing pin 44 can be smoothly inserted into the first pin hole 331, when the instrument armrest assembly 3 is folded downward, the limit pin 222 contacts with the straight edge portion of the limit groove 332, so as to limit the downward folding angle of the instrument armrest assembly 3, and prevent the instrument armrest assembly 3 from being damaged by collision with the upright column.

As shown in fig. 13, a steel cable pull ring 61 is further installed at the lower end of the handrail connecting piece 33, an upper steel cable sleeve seat 62 is welded at the lower end of the upper connecting piece 22, an upper steel cable sleeve 63 is fixedly installed on the upper steel cable sleeve seat 62, the upper steel cable sleeve 63 is of a hollow structure, the lower locking mechanism 5 comprises a stand column rotating shaft 51, a through hole 52, a stand column pin hole 53, a stand column pin 54, a clamping column 55, a lower steel cable sleeve 56 and a lower steel cable sleeve seat 57, the stand column rotating shaft 51 is fixedly welded on the lower connecting piece 23, the center of the stand column rotating shaft 51 is provided with the through hole 52 for inserting a bolt, the upper end of the through hole 52 is provided with the stand column pin hole 53, the stand column pin 54 is installed in the stand column pin hole 53, one end of the stand column pin 54 can extend out or retract from the stand column pin hole 53, the other end of the stand column pin 54 is provided with the clamping column 55, the lower steel cable sleeve seat 57 is installed outside the stand column pin hole 53, the lower steel cable sleeve seat 57 is fixedly welded on the lower steel cable sleeve seat 57, one end of the lower steel cable sleeve 56 extends into the stand column pin hole 53, a lower locking spring 58 is arranged between the lower steel cable sleeve 56 and the upright post pin 54, the lower end of a steel cable pull ring 61 is connected with a steel cable 64, the steel cable 64 passes through the upper steel cable sleeve 63 and the lower steel cable sleeve 56 downwards and then is fixedly connected with a clamping column 55, two sides of the running platform assembly 1 are provided with running platform sockets 11, second pin holes 111 are arranged in the running platform sockets 11, an upright post rotating shaft 51 is fixed in the running platform sockets 11 through bolts and can rotate in the running platform sockets 11, the upright post pin 54 can be inserted into the second pin holes 111 so as to limit the rotation of the upright post rotating shaft 51, when the folding handle 47 is lifted upwards, the driving seat 41 is driven to rotate upwards, the split pin 45 moves outwards in the sliding groove 431 under the acting force of a slope 412, so as to drive the handrail fixing pin 44 to be separated from the first pin hole 331, at the moment, the instrument handrail assembly 3 can be rotated and folded, and simultaneously, the instrument handrail assembly 3 is provided with the steel cable pull ring 61 arranged at the lower end of the handrail connecting sheet 33 in the folding process, the rotation of the handle connecting piece 33 is followed to move upward, so as to pull the cable 64, the cable 64 passes downward through the upper cable sleeve 63 and the lower cable sleeve 56 and then is fixedly connected with the clamping column 55, i.e. the column pin 54 is pulled to move away from the second pin hole 111, so that the column pin 54 is separated from the second pin hole 111, and at this time, the column assembly 2 is unlocked, and the column assembly 2 can be folded downward.

The working principle is as follows: firstly, when the upright post assembly 2 and the instrument armrest assembly 3 are in an open state and need to be folded, the folding handle 47 can be lifted upwards, the folding handle 47 drives the driving seat 41 to rotate upwards, the cotter pin 45 moves outwards in the sliding groove 431 under the action of the slope 412, so as to drive the armrest fixing pin 44 to compress the pin sleeve spring 46, the armrest fixing pin 44 is separated from the first pin hole 331, the instrument armrest assembly 3 is unlocked, so as to rotate and fold the instrument armrest assembly, in the process of folding the instrument armrest assembly 3, the steel cable pull ring 61 arranged at the lower end of the armrest connecting sheet 33 rotates and moves upwards along with the armrest connecting sheet 33, so as to pull the steel cable 64, the steel cable 64 passes through the upper steel cable sleeve 63 and the lower steel sleeve 56 downwards and then is fixedly connected with the clamping post 55, namely, the upright post pin 54 is pulled to move away from the second pin hole 111, the lower locking spring 58 is compressed, so as to separate the upright post pin 54 from the second pin hole 111, the pillar assembly 2 is unlocked at this moment, that is, the pillar assembly 2 can be folded downwards, when the pillar assembly 2 and the instrument armrest assembly 3 need to be opened, the pillar assembly 2 is firstly opened, then the instrument armrest assembly 3 is opened, at this moment, the cable pull ring 61 moves downwards, the cable 64 is loosened, the pillar pin 54 is inserted into the second pin hole 111 under the action of the lower locking spring 58, so that the pillar assembly 2 is locked and fixed, then the folding handle 47 is pulled downwards, and the armrest fixing pin 44 is inserted into the first pin hole 331 under the action of the pin sleeve spring 46, so that the instrument armrest assembly 3 is locked.

In the embodiments of the present application, the descriptions of the directional terms such as "front", "back", "left" and "right" are only described according to the directions shown in the drawings shown in the present application, and are not limited to the scope of the claims of the present application, and in the specific implementation process, other similar or similar embodiments may be obtained by correspondingly modifying the embodiments according to the embodiments, and all of the embodiments are within the scope of the present application, and the descriptions of the other similar or similar embodiments are not repeated in the present application.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.

Claims (9)

1. Treadmill that instrument handrail and stand can be folded in step, including running platform subassembly (1), stand subassembly (2) and instrument handrail subassembly (3), its characterized in that: upright post assemblies (2) are symmetrically arranged on two sides of the running platform assembly (1), an instrument handrail assembly (3) is movably arranged at the upper end of each upright post assembly (2), the instrument handrail assemblies (3) can be folded relative to the upright post assemblies (2), and the upright post assemblies (2) can be folded relative to the running platform assembly (1);

instrument handrail subassembly (3) are including instrument desk (31), handrail (32) and handrail connection piece (33), instrument desk (31) bilateral symmetry is provided with handrail (32), handrail (32) lower extreme is fixed and is provided with handrail connection piece (33), locking mechanism (4) are installed to stand subassembly (2) upper end, locking mechanism (4) are rotated with handrail connection piece (33) and are connected, locking mechanism (5) are installed down to stand subassembly (2) lower extreme, locking mechanism (5) are rotated with running platform subassembly (1) and are connected down.

2. The treadmill of claim 1, wherein the meter arm rest and the upright are synchronously foldable, wherein: the upright post component (2) comprises an upright post (21), an upper connecting piece (22) and a lower connecting piece (23), the upper end of the upright post (21) is welded and fixed with the upper connecting piece (22), and the lower end of the upright post (21) is welded and fixed with the lower connecting piece (23).

3. The treadmill of claim 2, wherein the meter arm rest and the upright are synchronously foldable, wherein: the upper locking mechanism (4) comprises a driving seat (41), a pin sleeve groove (411), a slope (412), a first rotating shaft (42), a pin sleeve (43), a sliding groove (431), a handrail fixing pin (44), a split pin (45), a pin sleeve spring (46) and a folding handle (47), the driving seat (41) is rotatably installed on the upper connecting sheet (22) through the first rotating shaft (42), the pin sleeve groove (411) is arranged in the middle of the driving seat (41), the pin sleeve (43) penetrates through the pin sleeve groove (411) and is fixedly installed on the upper connecting sheet (22), the handrail fixing pin (44) is installed inside the pin sleeve (43), the split pin (45) is fixedly installed at one end of the handrail fixing pin (44), the through sliding groove (431) is arranged on the pin sleeve (43), two ends of the split pin (45) extend out of the sliding groove (431), and the pin sleeve spring (46) is further installed inside the pin sleeve (43), pin bush spring (46) one end with handrail fixed pin (44) are inconsistent, and the other end is inconsistent with pin bush (43) top, pin bush groove (411) both sides are provided with slope (412), slope (412) are inconsistent with split pin (45) both ends, rotate drive seat (41) can drive split pin (45) through slope (412) and outwards or inwards move on spout (431), one side withdrawal or the stretching out of last connection piece (22) can be followed to the other end of handrail fixed pin (44), folding handle (47) are still installed to the one end of drive seat (41).

4. The treadmill of claim 3, wherein the meter arm rest and the upright are synchronously foldable, wherein: the handrail fixing device is characterized in that a second rotating shaft (221) is further arranged on the upper connecting piece (22), the handrail connecting piece (33) is rotatably connected with the upper connecting piece (22) through the second rotating shaft (221), a first pin hole (331) is formed in the handrail connecting piece (33), and the handrail fixing pin (44) can be inserted into the first pin hole (331) to limit the rotation of the handrail connecting piece (33).

5. The treadmill of claim 4, wherein the meter arm rest and the upright are synchronously foldable, wherein: the inner side of the upper connecting piece (22) is provided with a limiting pin (222), the lower end of the handrail connecting piece (33) is provided with a limiting groove (332), and the limiting pin (222) can limit the clockwise or anticlockwise rotating angle of the handrail connecting piece (33) at the same time.

6. The treadmill of claim 5, wherein the meter arm rest and the upright are synchronously foldable, and wherein: the handrail connecting piece (33) lower extreme still installs cable wire pull ring (61), go up connecting piece (22) lower extreme welding has last cable wire sleeve seat (62), go up cable wire sleeve seat (62) and go up fixed mounting and have last cable wire sleeve (63), go up cable wire sleeve (63) and be hollow structure.

7. The treadmill of claim 6, wherein the meter arm rest and the upright are synchronously foldable, wherein: the lower locking mechanism (5) comprises an upright post rotating shaft (51), a through hole (52), an upright post pin hole (53), an upright post pin (54), a clamping column (55), a lower steel cable sleeve (56) and a lower steel cable sleeve seat (57), wherein the upright post rotating shaft (51) is fixedly welded on the lower connecting sheet (23), the center of the upright post rotating shaft (51) is provided with the through hole (52) for inserting a bolt, the upper end of the through hole (52) is provided with the through upright post pin hole (53), the upright post pin (54) is installed in the upright post pin hole (53), one end of the upright post pin (54) can extend out or retract from the upright post pin hole (53), the other end of the upright post pin (54) is provided with the clamping column (55), the outer side of the upright post pin hole (53) is provided with the lower steel cable sleeve seat (57), the lower steel cable sleeve (56) is fixedly welded on the lower steel cable sleeve seat (57), one end of the lower steel cable sleeve (56) extends into the upright post pin hole (53), and a lower locking spring (58) is arranged between the lower steel cable sleeve (56) and the upright pin (54).

8. The treadmill of claim 7, wherein the meter arm rest and the upright are synchronously foldable, and wherein: the lower end of the steel cable pull ring (61) is connected with a steel cable (64), and the steel cable (64) penetrates through the upper steel cable sleeve (63) and the lower steel cable sleeve (56) downwards and then is fixedly connected with the clamping column (55).

9. The treadmill of claim 8, wherein the meter arm rest and the upright are synchronously foldable, wherein: run platform subassembly (1) both sides and be provided with and run platform socket (11), be provided with second pinhole (111) in running platform socket (11), stand pivot (51) pass through the bolt fastening run in platform socket (11) and can be in running platform socket (11) internal rotation, thereby stand round pin (54) can insert second pinhole (111) restriction stand pivot (51) are rotatory.

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