Base coupling structure of a height adjustable chair

Abstract

A base coupling structure of a height adjustable chair, using a sleeve to connect an oil cylinder and a foot support of a height adjustable chair, the sleeve and the oil cylinder can be tightly embedded together by taking the advantages of having slightly different taper sizes and different elasticity of materials, and the sleeve is coupled with the foot support by a screwing base structure which can be dismantle, so the present invention not only can enhance the speed of the replacing the used oil cylinder, but also can protect the foot support from being damaged and allow a reduction in service cost of the height adjustable chair.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a base structure of a height adjustable chair and, more particularly, to a coupling structure between an oil cylinder and a foot support of the base of a height adjustable chair. BACKGROUND OF THE INVENTION [0002] Please refer to FIGS. 1 and 2, the conventional height adjustable chair comprises of a seat portion 1, an oil cylinder 2 and a foot support 3. The oil cylinder 2 includes an adjustable lever 2c, an extensible rod 2a and a connecting post 2b. The extensible rod 2a is mounted underneath the seat portion 1 by a suited base 4 and a plurality of screws 5. Both the connecting post 2b and the foot support 3 having a taper correspondingly, so that the connecting post 2b can be tightly embedded into the foot support 3 by the slightly differences between the taper sizes and the elasticity of the materials between the two. According to the above structure, users can activate the adjustable lever 2c to elongate the extensi...

AI Technical Summary

Benefits of technology

[0004] It is a primary object of the present invention is to provide a coupling structure for the oil cylinder and the foot support of the height adjustable chair, so as to enhance the convenience of replacing the used oil cylinder without damaging the foot support.

[0005] In order to achieve the foregoing objects, the present invention provides a base coupling structure of a height adjustable chair of the present invention comprising an oil cylinder, a sleeve and a foot support. The bottom of the oil cylinder has a connecting post and such connecting post has a taper. The sleeve having a receiving hole which has a larger outer circumference and a smaller inner circumference. And the size of the receiving hole corresponds to the size of the connecting post of the oil cylinder. Thus, the connecting post of the oil cylinder can be tightly embedded into the receiving hole of the sleeve by taking the advantages of having slightly different taper sizes and different elasticity of materials. The foot support has a housing space, and the aperture of the housing space is slightly bigger than the sleeve, so that there will be a gap between the sleeve and the housing space when they are coupled together. As a result, the foot support of the present invention can be easily separated from the sleeve, when the oil cylinder of the present invention is damaged, by taking the advantage of the improved base coupling structure between the sleeve and the foot support, not only the speed of the replacing action can be enhanced, but also the foot support can be protected from damage, allowing a reduction in service cost of the height adjustable chair.

Problems solved by technology

Although the altitude of the seat portion 1 of the conventional height adjustable chair can be adjusted according to the demand of the user, the oil cylinder 2 of the conventional height adjustable chair is easily damaged by the over frequent adjustment.

Therefore, the foot support 3 of the conventional height adjustable chair can be easily damaged during the replacement of the used oil cylinder 2.

Thus, causing an increase in service cost of the conventional height adjustable chair and obviously does not conform to the demand of services.

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