Automatic rising air pressure rod

Abstract

The utility model discloses an automatic rising air pressure rod which comprises a connecting part, the connecting part is arranged at one end, connected with a bottom plate of an outer pipe, of a piston rod, a limiting piece and a gasket piece are arranged on the peripheral side of the bottom plate, the limiting piece is connected with the bottom plate in a clamped mode, the connecting part penetrates through the gasket piece, the limiting piece and the bottom plate, and the end of the connecting part is fastened and limited through a fastener. The stable connection of the piston rod and the outer pipe is realized; by arranging the connecting part and the gasket piece and the limiting piece which are matched with the connecting part, circumferential limiting of the piston rod is achieved through clamping matching of the limiting piece and the bottom plate, the piston rod is prevented from relatively rotating in the outer pipe, meanwhile, the connecting part penetrates through the gasket piece, the limiting piece and the bottom plate and then is connected with the fastening piece, assembling can be completed, and meanwhile stable connection can be achieved; installation is convenient, operation is simple, and assembling is reliable; compared with the prior art, a spring pin structure is not needed, materials are saved, and cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas pressure rods, in particular to an automatic recovery gas pressure rod. Background Art

[0002] A swivel chair is a type of computer chair or office chair that can be raised and lowered and rotated 360 degrees. The basic principle of its raising and lowering is that there is a pneumatic rod in the lifting device. The pneumatic rod is an elastic element that uses gas and liquid as working medium and can perform functions such as support, cushioning, braking, height adjustment and angle adjustment. It consists of a tube body, a piston mechanism, a piston rod and several connecting parts, and is filled with high-pressure nitrogen.

[0003] In the existing pneumatic rod technology, the piston rod is usually fixed to one end of the guide sleeve through structures such as gaskets and nuts. In addition, structures such as locating pins are provided to limit the piston rod. The assembly of the pneumatic rod is relatively troublesome, and there are many assembly parts, the material consumption is large, and the production efficiency is low. Utility Model Content

[0004] In view of the shortcomings of the existing technology, an automatic recovery gas pressure rod is proposed, which solves the problems of the gas pressure rod in the above background technology that is difficult to assemble, has many assembly parts, uses a large amount of materials, and has low production efficiency.

[0005] To achieve the above objectives, the present invention proposes the following technologies:

[0006] A self-recovering pneumatic rod includes a connecting portion, which is arranged at one end where a piston rod is connected to a bottom plate of an outer tube. A limiting member and a gasket are arranged on the peripheral side of the bottom plate. The limiting member is clamped with the bottom plate. The connecting portion passes through the gasket, the limiting member and the bottom plate, and the end is fastened and limited by a fastener to achieve a stable connection between the piston rod and the outer tube.

[0007] Furthermore, the connecting portion includes a clearance groove formed at the end of the cylindrical piston rod, and two clearance grooves are arranged on the piston rod in an opposite manner so that the cross section of the end of the piston rod is oblate.

[0008] Furthermore, the gasket member includes a flat gasket, which is provided with a first through hole matching the shape of the connecting part so that the connecting part can pass through the flat gasket. A limiting step is formed between the clearance groove and the piston rod to abut against the flat gasket to achieve axial limitation of the piston rod.

[0009] Furthermore, the limiting member is specifically a limiting ring, which is provided with a second through hole matching the shape of the connecting portion. The limiting ring is located between the flat gasket and the base plate and is clamped to the base plate to limit the circumferential position of the piston rod.

[0010] Furthermore, the limiting ring includes a first limiting ring and a second limiting ring fixed to the bottom of the first limiting ring. The outer circumference of the second limiting ring is polygonal, and a limiting hole matching the shape of the second limiting ring is opened on the bottom plate.

[0011] Furthermore, the edge of the second limiting ring away from the first limiting ring is provided with a chamfer, and the chamfered surface is inclined toward the side close to the second through hole to facilitate the engagement of the second limiting ring with the limiting hole.

[0012] Furthermore, the gasket member further includes a spring gasket, which is located between the base plate and the fastener, and the connecting portion passes through the spring gasket and is detachably connected to the fastener.

[0013] Furthermore, the fastener is specifically a nut, and the connecting portion further includes an external thread provided on the end of the piston rod, and the nut is threadedly connected to the piston rod to achieve fixed installation of the piston rod.

[0014] Compared with the prior art, the comprehensive effects brought by the utility model include:

[0015] The present application sets a connecting part and a gasket and a limit part matching it, and realizes circumferential limitation of the piston rod by the clamping cooperation between the limit part and the base plate, thereby preventing the piston rod from rotating relative to the outer tube. At the same time, the connecting part passes through the gasket, the limit part and the base plate and then connects the fasteners to complete the assembly. At the same time, it can achieve a stable connection, easy installation, simple operation, and reliable assembly. Compared with the existing technology, there is no need to use a spring pin structure, which saves materials and effectively reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an exploded diagram of the prior art gas pressure rod assembly structure;

[0017] Figure 2 This is a schematic diagram of the structure of the existing gas pressure rod assembly;

[0018] Figure 3 This is an exploded schematic diagram of the assembly structure of the gas pressure rod according to an embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the pneumatic rod after assembly according to an embodiment of the utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the limiting ring of an embodiment of the utility model.

[0021] Legend: 1. Base plate; 2. Special-shaped gasket; 3. Spring pin; 4. Long hole; 5. Piston rod; 6. Gap groove; 7. Flat gasket; 8. Limit step; 9. Limit ring; 10. Limit hole; 11. Chamfer; 12. Spring gasket; 13. Nut; 14. External thread. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts are within the scope of protection of the present invention.

[0023] In this document, relational terms such as "first" and "second" are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Terms such as "upper," "lower," "left," "right," and "top" indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] In the prior art, Figure 1 and Figure 2 As shown, when assembling the pneumatic rod, first the piston rod passes through the multi-layer gaskets, and a special-shaped gasket 2 is set to fit the bottom plate 1 from below. The protrusions on its surface match the slots on the bottom plate 1 to prevent the special-shaped gasket 2 from rotating. A plug-in hole is opened at the bottom end of the piston rod, and then the spring pin 3 is plugged into the piston rod through the plug-in hole, and then the piston rod and spring pin 3 pass through the bottom plate 1 and are plugged into the long hole 4 on the special-shaped gasket 2. The spring pin 3 is limited by the long hole 4 to prevent the piston plate from rotating. Finally, the bottom fastener is used to cooperate with the piston rod to achieve fixation, and the assembly of the pneumatic rod is completed; the above assembly process has a complex structure, cumbersome operation, and is inconvenient to install.

[0025] like Figures 3 to 5 As shown, this embodiment proposes an automatic recovery pneumatic rod, including a connecting part, which is arranged at one end where the piston rod 5 is connected to the bottom plate 1 of the outer tube, and a limiting part and a gasket are arranged on the peripheral side of the bottom plate 1. The limiting part is clamped with the bottom plate 1, and the connecting part passes through the gasket, the limiting part and the bottom plate 1, and the end is fastened and limited by a fastener to achieve a stable connection between the piston rod 5 and the outer tube.

[0026] By providing a connecting portion and a gasket and a limiter matched therewith, the circumferential limitation of the piston rod 5 is achieved through the clamping cooperation between the limiter and the base plate 1, thereby preventing the piston rod 5 from rotating relative to the outer tube. At the same time, the connecting portion passes through the gasket, the limiter and the base plate 1 and then the fasteners are connected to complete the assembly. At the same time, a stable connection can be achieved, the installation is convenient, the operation is simple, and the assembly is reliable. Compared with the existing technology, there is no need to use a spring pin structure, which saves materials and effectively reduces costs.

[0027] In the automatic lifting pneumatic rod of this embodiment, the connecting portion includes a clearance groove 6 opened at the end of the cylindrical piston rod 5. Two clearance grooves 6 are arranged on the piston rod 5 so that the cross section of the end of the piston rod 5 is oblate.

[0028] Specifically, the clearance groove 6 is formed by cutting off part of the piston rod 5 body material with a D-shaped cross-section at the end of the piston rod 5. Through the above arrangement, the two sides of the end of the piston rod 5 are parallel, and the other two sides are arc-shaped, that is, the cross-section of the connecting end is flat as a whole, so that the piston rod 5 itself can be plugged into the matching mounting hole on the base plate 1 to achieve circumferential limitation, which is convenient for achieving limitation, thereby preventing the piston rod 5 from rotating.

[0029] In the automatic recovery pneumatic rod of this embodiment, the gasket part includes a flat gasket 7, which is provided with a first through hole matching the shape of the connecting part so that the connecting part can pass through the flat gasket 7. A limiting step 8 is formed between the relief groove 6 and the piston rod 5 to abut against the flat gasket 7 to achieve axial limitation of the piston rod 5.

[0030] Specifically, a flat gasket 7 is provided to protect the piston rod 5, increase the contact area with the limiter or the base plate 1, reduce the pressure, and protect the piston rod 5 from damage; the limiting step 8 formed on the piston rod 5 due to the provision of the clearance groove 6 abuts against the flat gasket 7 during assembly, thereby limiting the insertion length of the piston rod 5 and limiting its axial position.

[0031] In the automatic recovery pneumatic rod of this embodiment, the limiting part is specifically a limiting ring 9, which is provided with a second through hole matching the shape of the connecting part. The limiting ring 9 is located between the flat gasket 7 and the base plate 1 and is clamped with the base plate 1 to limit the circumferential position of the piston rod 5.

[0032] The spacing between the limit ring 9 and the base plate 1 is set to limit the piston rod 5 passing through the limit ring 9, so as to prevent the piston rod 5 from directly contacting the base plate 1, thereby preventing the piston rod 5 from being subjected to the torque of the base plate 1, resulting in stress concentration and wear, which affects normal use. While the limit ring 5 is set to achieve circumferential limitation of the piston rod 5, it reduces the loss of important components of the pneumatic rod and increases the service life of the pneumatic rod.

[0033] In the automatic recovery pneumatic rod of this embodiment, the limiting ring 9 includes a first limiting ring and a second limiting ring fixed to the bottom of the first limiting ring. The outer periphery of the second limiting ring is polygonal, and a limiting hole 10 matching the shape of the second limiting ring is opened on the bottom plate 1.

[0034] Specifically, the diameter of the first limiting ring is the same as that of the flat gasket 7. The first limiting ring and the flat gasket 7 fit tightly together to protect the piston rod 5. The second limiting ring is inserted into the limiting hole 10 on the base plate 1 to achieve circumferential limitation of the limiting ring 9 as a whole, thereby limiting the rotation of the piston rod 5 in the outer tube.

[0035] Preferably, in this embodiment, the second limiting ring is in the shape of a regular hexagon, which has uniform force and good limiting effect.

[0036] In the automatic recovery pneumatic rod of this embodiment, a chamfer 11 is provided on the edge of the second limiting ring away from the first limiting ring, and the surface of the chamfer 11 is inclined toward the side close to the second through hole to facilitate the engagement of the second limiting ring with the limiting hole 10.

[0037] By providing the chamfer, the assembly and cooperation between the limiting ring 9 and the base plate 1 is facilitated, the installation efficiency of the limiting ring 9 is improved, and the assembly efficiency of the entire gas pressure rod is further improved.

[0038] In the automatic recovery gas pressure rod of this embodiment, the gasket member further includes a spring gasket 12, which is located between the base plate 1 and the fastener. The connecting portion passes through the spring gasket 12 and is detachably connected to the fastener.

[0039] Specifically, a spring washer 12 is provided at the bottom of the base plate 1 to protect the other end of the piston rod 5 and cooperate with the fastener to provide a buffer space during the fastening process to prevent the fastener from loosening due to thermal expansion and contraction, thereby improving the assembly and fixing effect.

[0040] In the automatic recovery pneumatic rod of this embodiment, the fastener is specifically a nut 13, and the connecting portion further includes an external thread 14 provided at the end of the piston rod 5. The nut 13 is threadedly connected to the piston rod 5 to achieve fixed installation of the piston rod 5.

[0041] Through the external threads 14 on both sides of the end of the piston rod 5 and the threaded cooperation with the nut 13, the piston rod 5 is passed through the flat washer 7, the limiting ring 9, the base plate 1 and the spring washer 12 in sequence, and then the nut 13 is tightened to press the spring washer 12 to complete the fixed installation of the piston rod 5. The operation is simple, the assembly is convenient, and the fixing and limiting effect is good.

[0042] In the present invention, unless otherwise clearly stipulated and limited, the terms "installation", "setting", "connection", "fixation", "rotation" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0043] Although the embodiments of the present invention have been shown and described in detail, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic lifting gas pressure rod, characterized in that: It includes a connecting part, which is arranged at one end where the piston rod is connected to the bottom plate of the outer tube. A limiting part and a gasket are arranged on the peripheral side of the bottom plate. The limiting part is clamped with the bottom plate. The connecting part passes through the gasket, the limiting part and the bottom plate, and the end is fastened and limited by a fastener to achieve a stable connection between the piston rod and the outer tube.

2. The automatic recovery gas pressure rod according to claim 1, characterized in that: The connecting portion includes a clearance groove formed on the end of the cylindrical piston rod. Two clearance grooves are arranged on the piston rod in opposite directions so that the cross section of the end of the piston rod is oblate.

3. The automatic recovery gas pressure rod according to claim 2, characterized in that: The gasket comprises a flat gasket, which is provided with a first through hole matching the shape of the connecting portion so that the connecting portion passes through the flat gasket. A limiting step is formed between the relief groove and the piston rod to abut against the flat gasket to achieve axial limiting of the piston rod.

4. The automatic recovery gas pressure rod according to claim 3, characterized in that: The limiting member is specifically a limiting ring, which is provided with a second through hole matching the shape of the connecting portion. The limiting ring is located between the flat gasket and the base plate and is clamped with the base plate to limit the circumferential position of the piston rod.

5. The automatic recovery gas pressure rod according to claim 4, characterized in that: The limiting ring includes a first limiting ring and a second limiting ring fixed to the bottom of the first limiting ring. The outer circumference of the second limiting ring is polygonal, and a limiting hole matching the shape of the second limiting ring is opened on the bottom plate.

6. The automatic recovery gas pressure rod according to claim 5, characterized in that: An edge of the second limiting ring away from the first limiting ring is provided with a chamfer, and the chamfered surface is inclined toward the side close to the second through hole so as to facilitate the engagement of the second limiting ring with the limiting hole.

7. The automatic recovery gas pressure rod according to claim 2, characterized in that: The gasket member further comprises a spring gasket, which is located between the base plate and the fastener. The connecting portion passes through the spring gasket and is detachably connected to the fastener.

8. The automatic recovery gas pressure rod according to claim 7, characterized in that: The fastener is specifically a nut, and the connecting portion further includes an external thread provided on the end of the piston rod. The nut is threadedly connected to the piston rod to achieve fixed installation of the piston rod.

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