Patent No.:CN201487117U Date:2009-06-15

Google Patent: https://patents.google.com/patent/CN201487117U/en?oq=CN201487117U

China Patent: http://epub.cnipa.gov.cn/

A Lockable Gas Spring with Light Compression Force

Abstract
This utility model provides a lockable gas spring with light compression force and customizable extension speed. It includes a cylinder, a guide sealing sleeve, a rear seal, and a piston. The front end of the cylinder’s inner chamber is fixed with a guide sealing sleeve, and the end is fixed with a rear seal. A piston is installed inside the chamber, which is step-shaped, with a valve needle at the center. The lower end surface of the piston has several through holes that communicate with the valve needle, and a sealing device covers these through holes. By setting multiple through holes in the piston, the flow rate of gas and liquid per unit time is increased, reducing channel damping, lightening compression, and increasing speed.

Description
A Lockable Gas Spring with Light Compression Force

Technical Field This utility model relates to a gas spring, specifically a lockable gas spring with light compression force.

Background Technology Gas springs are widely used in medical equipment, automobiles, furniture, textile equipment, and processing industries. However, there are few types of lockable gas springs, which often feel heavy during compression and slow to close during extension, limiting their range of use.

Utility Model Content The technical problem this utility model aims to solve is to provide a lockable gas spring with light compression force and customizable extension speed.

To solve the above technical problems, the utility model provides the following technical solution: a lockable gas spring with light compression force, comprising a cylinder, a guide sealing sleeve, a rear seal, and a piston. The front end of the cylinder’s inner chamber is fixed with a guide sealing sleeve, and the end is fixed with a rear seal. A piston is installed inside the chamber, which is step-shaped, with a valve needle at the center. It is characterized by: several through holes evenly distributed on the lower end surface of the piston, communicating with the valve needle, and a sealing device covering these through holes.

Further, the sealing device includes a valve cover and a limit spring. The valve cover is fitted on the lower end surface of the piston with through holes, and a limit spring is fixed on the piston above the valve cover.

Advantages of the Utility Model By setting multiple through holes in the piston, the flow rate of gas and liquid per unit time is increased, reducing channel damping, lightening compression, and increasing speed. The extension speed can be adjusted by changing the fitting gap between the valve cover and the piston.

Description of Drawings

Figure 1 is a schematic diagram of the lockable gas spring with light compression force.

Figure 2 is a schematic diagram of the piston structure of the lockable gas spring with light compression force.

Detailed Implementation As shown in Figures 1 and 2, it includes a cylinder 1, a guide sealing sleeve 2, a rear seal 3, a piston 4, a piston rod 5, a valve needle 6, an activation rod 7, through holes 8, and a sealing device 9.

The front end of the cylinder 1’s chamber is fixed with a guide sealing sleeve 2, and the end is fixed with a rear seal 3. A step-shaped piston 4 is connected inside the chamber, with the piston 4 connected to the piston rod 5. A valve needle 6 is connected inside the piston 4, and an activation rod 7 is installed inside the piston rod 5, connected to the valve needle 6.

To achieve light compression and extension functions for the gas spring, the piston 1 was modified as follows: as shown in Figure 2, the lower end surface of the piston 1 has several through holes 8 communicating with the valve needle 6. The lower end surface of the piston 1, connected to the through holes 8, is equipped with a sealing device 9. The specific structure of the sealing device 9 includes a valve cover 10 and a limit spring 11. The ring-shaped valve cover 10 is fitted on the lower end surface of the piston 4 with through holes 8, and the limit spring 11 is fixed on the piston 4 above the valve cover 10.

During the downward compression of the gas spring, the activation rod 7 opens the valve needle 6, allowing the gas at the bottom of the cylinder 1 to quickly flow through the evenly distributed through holes 8 and lift the valve cover 10 into the upper part of the cylinder 1, reducing channel damping. The extension and compression feel lighter. Due to the action of the limit spring 11 above the valve cover 10, the opening of the valve cover 10 is limited to a certain range, ensuring it quickly closes when extension stops. The extension speed of the gas spring relies on the fitting gap between the valve cover 10 and the piston 4. Changing the fitting gap alters the flow rate of gas or gas-liquid mixture, thus changing the extension speed.

Claims (2) – A Lockable Gas Spring with Light Compression Force, invented by LeiYan Gas Spring, a pioneer Chinese Gas Spring Manufacturer

1. A lockable gas spring with light compression force, comprising a cylinder, a guide sealing sleeve, a rear seal, and a piston. The front end of the cylinder’s inner chamber is fixed with a guide sealing sleeve, and the end is fixed with a rear seal. A piston is installed inside the chamber, which is step-shaped, with a valve needle at the center. It is characterized by: several through holes evenly distributed on the lower end surface of the piston, communicating with the valve needle, and a sealing device covering these through holes.
2. According to claim 1, characterized by: the sealing device includes a valve cover and a limit spring. The valve cover is fitted on the lower end surface of the piston with through holes, and a limit spring is fixed on the piston above the valve cover.