CN216393538U

CN216393538U - Locking device for air pressure rod of swivel chair base

Info

Publication number: CN216393538U
Application number: CN202122605786.8U
Authority: CN
Inventors: 张久智
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-04-29
Anticipated expiration: 2031-10-27

Abstract

The utility model discloses a locking device for a pneumatic rod of a base of a swivel chair, and relates to a locking device for relative rotation of the pneumatic rod of the base of the swivel chair. The middle shaft 2 can rotate relative to the outer sleeve 1, the middle shaft 2 is a hollow shaft, and a middle shaft through hole 231 is formed in the lower end of the middle shaft 2 along the middle shaft circumferential wall 23; the inner shaft 3 comprises an inner shaft top end journal 31, an inner shaft body 32 and an inner shaft tail 33; the shaft neck 31 at the top end of the inner shaft extends out of the circular hole 221 of the middle shaft, and the shaft body 32 of the inner shaft is positioned in the inner cavity 21 of the middle shaft and can realize up-and-down displacement relative to the middle shaft 2; the inner shaft tail 33 is provided with a necking part 331 and a cylindrical part 332; a blocking plug 4 is arranged between the inner shaft tail 33 and the middle shaft through hole 231, and the blocking plug 4 can move in the middle shaft through hole 231. The device can make the swivel chair lock when needing and prevent that the swivel chair from rotating to guarantee that old person or special crowd no longer make it empty or fall down because of the rotation aversion of swivel chair when standing up or sitting down, thereby guarantee its safety in utilization.

Description

Locking device for air pressure rod of swivel chair base

Technical Field

The utility model discloses a locking device for a pneumatic rod of a base of a swivel chair, relates to the base of the swivel chair, in particular to a locking device for the relative rotation of the pneumatic rod of the base of the swivel chair.

Background

The swivel chair has been widely used in various industries and different scenes, such as offices, meeting rooms and families, in different age groups due to the advantages of flexible rotation, convenient movement, adjustable height and the like. However, for the elderly, the reaction is slow, the user needs to pay great attention to standing and sitting down when using the swivel chair, because the body moves, and the swivel chair rotates or moves because of the movement of the human body, so that the user can go to idle or fall down without paying a little attention to standing or sitting down. To prevent the rotation of a swivel chair when a person stands up or sits down, a swivel chair base air pressure bar locking device is developed

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a swivel chair base air pressure bar locking device which can lock a swivel chair to prevent the swivel chair from rotating when needed, so that the swivel chair is prevented from being emptied or fallen down due to the rotation and displacement of the swivel chair when the swivel chair is erected or seated, and the use safety of the swivel chair is ensured.

The technical scheme of the utility model is as follows: the revolving chair base air pressure bar locking device comprises an outer sleeve 1 and a middle shaft 2, wherein the middle shaft 2 partially extends into the outer sleeve 1, and the middle shaft 2 can rotate relative to the outer sleeve 1, and the revolving chair base air pressure bar locking device is characterized in that the middle shaft 2 is a hollow shaft, an inner cavity 21 of the middle shaft 2 is cylindrical, a middle shaft round hole 221 is arranged on a top surface 22 at the top end of the middle shaft 2, and a middle shaft through hole 231 is arranged at the lower end of the middle shaft 2 along a middle shaft circumferential wall 23; the inner shaft 3 comprises an inner shaft top end journal 31, an inner shaft body 32 and an inner shaft tail 33; the inner shaft top end journal 31 extends out of the middle shaft round hole 221, and the journal 31 is blocked on the middle shaft top surface 22 by a step 311; the inner shaft body 32 is positioned in the middle shaft inner cavity 21 and can realize up-and-down displacement relative to the middle shaft 2; the inner shaft tail 33 is provided with a necking part 331 and a cylindrical part 332; a blocking plug 4 is arranged between the inner shaft tail 33 and the middle shaft through hole 231, the diameter of the blocking plug 4 is smaller than the aperture of the middle shaft through hole 231, the length of the blocking plug 4 is larger than the thickness of the circumferential wall 23 of the middle shaft 2, and the blocking plug 4 can move in the middle shaft through hole 231.

In the above locking device for the pneumatic rod of the swivel chair base, the central shaft through holes 231 are several and equally distributed along the circumference of the central shaft 2.

In the pneumatic rod locking device for the base of the swivel chair, the blocking plug 4 is a ball.

In the pneumatic rod locking device for the base of the swivel chair, the blocking plug 4 is a cylinder.

In the above locking device for the pneumatic rod of the swivel chair base, the number of the middle shaft through holes 231 is three and equally distributed along the circumference of the middle shaft 2.

In the above locking device for the pneumatic rod of the swivel chair base, the necking part 331 is an isosceles circular table, and the cross section of the necking part is isosceles trapezoid.

The swivel chair has the advantages that the swivel chair is locked when needed to prevent the swivel chair from rotating, so that the old or special people can be prevented from emptying or falling down due to the rotation and the displacement of the swivel chair when standing up or sitting down, and the use safety of the swivel chair is guaranteed.

Drawings

Fig. 1 is a perspective view of the swivel seat base air pressure bar locking device of the utility model.

Fig. 2 is an exploded view of the swivel seat base air pressure bar locking device assembly of the present invention.

Fig. 3 is a longitudinal sectional view of fig. 1.

FIG. 4 is a perspective view of the center shaft of the pneumatic rod locking device of the base of the swivel chair of the present invention.

FIG. 5 is a front view of the center shaft of the air pressure bar locking device of the base of the swivel chair.

Fig. 6 is a sectional view a-a shown in fig. 5.

Fig. 7 is a perspective view of the inner shaft of the air pressure bar locking device of the base of the swivel chair.

Detailed Description

The present invention will be described in further detail with reference to the following examples and the accompanying drawings.

Referring to fig. 1, 2, 3, 4, 5, 6 and 7, the embodiment of the present invention is shown. The middle shaft 2 partially extends into the outer sleeve 1, a limiting hole 111 is formed in an outer sleeve circumferential wall 11 of the outer sleeve 1, a middle shaft circumferential groove 24 distributed along 360 degrees of the circumference of the middle shaft 2 is formed in the middle shaft 2, a limiting pin penetrates through the limiting hole 111 and is inserted into the middle shaft circumferential groove 24, the middle shaft 2 can only rotate around a central line 0 and cannot move up and down along the central line 0, and the middle shaft 2 rotates around the central line 0, namely the outer sleeve 1 rotates at present. The middle shaft 2 is a hollow shaft, the inner cavity 21 of the middle shaft is cylindrical, a middle shaft circular hole 221 is formed in the table top 22 at the top end of the middle shaft 2, the middle shaft circular hole 221 is a through hole, and a middle shaft through hole 231 is formed in the lower end of the middle shaft 2 along the middle shaft circumferential wall 23; the inner shaft 3 is positioned in the inner cavity 21 of the middle shaft 2; the inner shaft 3 comprises an inner shaft top end journal 31, an inner shaft body 32 and an inner shaft tail 33; the inner shaft top end journal 31 extends out of the middle shaft round hole 221, and the journal 31 is blocked on the lower surface of the middle shaft top end table 22 by a step 311; the inner shaft body 32 is positioned in the middle shaft inner cavity 21 and can realize up-and-down displacement relative to the middle shaft 2; the inner shaft tail 33 is provided with a necking part 331 and a cylindrical part 332; thus, a wall clamping space 2-3 exists between the cylindrical portion 332 and the middle shaft circumferential wall 23, a blocking piece 4 is arranged at the middle shaft through hole 231 and in the wall clamping space 2-3, in this embodiment, the blocking piece 4 is a ball, the diameter of the ball is smaller than the aperture of the middle shaft through hole 231 and larger than the thickness of the middle shaft 2 circumferential wall 23, and the blocking piece 4 can displace in the middle shaft through hole 231, although the blocking piece 4 can also be a small cylinder, the diameter of the small cylinder is smaller than the aperture of the middle shaft through hole 231, and the length of the small cylinder is larger than the thickness of the middle shaft 2 circumferential wall 23. Thus, when the inner shaft top end journal 31 is pressed down, that is, when a downward external force is applied to the inner shaft top end journal 31, the inner shaft tail 33 moves downward relative to the central shaft 2, at this time, the constricted portion 331 of the inner shaft tail 33 presses the plug 4 and forces it to move toward the outer sleeve circumferential wall 11 of the outer sleeve 1 in the central shaft through hole 231 and press the outer sleeve circumferential wall 11, in this state, the central shaft 2 cannot rotate relative to the outer sleeve 1, the plug 4 at this time corresponds to a pin between the central shaft 2 and the outer sleeve 1, and if the central shaft 2 rotates relative to the outer sleeve 1, the friction between the plug 4 and the outer sleeve circumferential wall 11 must be overcome.

In a further mode, the central axis through holes 231 are a plurality of and are equally distributed along the circumference of the central axis 2, and the necking part 331 is an isosceles circular table, and the cross section of the necking part is an isosceles trapezoid. Therefore, the stress distribution is uniform, and the locking of the middle shaft 2 and the outer sleeve 1 is more stable and safer.

When the air pressure bar locking device of the swivel chair base is used on a swivel chair, the air pressure bar can be locked to prevent the swivel chair from rotating when a person stands up or sits down, so that the old or special people can be prevented from emptying or falling down due to the rotation and the displacement of the swivel chair when standing up or sitting down, and the use safety of the swivel chair can be ensured.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. The air pressure bar locking device for the swivel chair base comprises an outer sleeve (1) and a middle shaft (2), wherein the middle shaft (2) partially extends into the outer sleeve (1), the middle shaft (2) can rotate relative to the outer sleeve (1), and the air pressure bar locking device is characterized in that the middle shaft (2) is a hollow shaft, an inner cavity (21) of the middle shaft is cylindrical, a middle shaft circular hole (221) is formed in the top surface (22) of the top end of the middle shaft (2), and a middle shaft through hole (231) is formed in the lower end of the middle shaft (2) along the circumference wall (23) of the middle shaft; the inner shaft (3) comprises an inner shaft top end journal (31), an inner shaft body (32) and an inner shaft tail (33); the shaft neck (31) at the top end of the inner shaft extends out of the central shaft circular hole (221), and the shaft neck (31) is blocked on the top surface (22) at the top end of the central shaft by a step (311); the inner shaft body (32) is positioned in the middle shaft inner cavity (21) and can realize up-and-down displacement relative to the middle shaft (2); the inner shaft tail (33) is provided with a necking part (331) and a cylindrical part (332); a blocking plug (4) is arranged between the inner shaft tail (33) and the middle shaft through hole (231), the diameter of the blocking plug (4) is smaller than the aperture of the middle shaft through hole (231), the length of the blocking plug (4) is larger than the thickness of the circumferential wall (23) of the middle shaft (2), and the blocking plug (4) can move in the middle shaft through hole (231).

2. The revolving chair base air pressure bar locking device according to claim 1, characterized in that the central shaft through holes (231) are several and equally distributed along the circumference of the central shaft (2).

3. The revolving chair base barotrap locking device of claim 1 or 2, wherein the blocking means (4) is a ball.

4. The revolving chair base barotrap locking device of claim 1 or 2, wherein the catch (4) is a cylinder.

5. The revolving chair base air pressure bar locking device according to claim 3, characterized in that the number of the middle shaft through holes (231) is three and equally distributed along the circumference of the middle shaft (2).

6. The revolving chair base air pressure bar locking device according to claim 3, wherein the necking part (331) is an isosceles circular table with a cross section of an isosceles trapezoid.