Patent Application
20060214489
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.
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Therefore, the altitude of the seat portion 1 can be adjusted according to the height of different users. This kind of height adjustable chair is commonly used in beauty parlors and saloons, so that the altitude of the client can be adjusted in order to facilitate the process of the treatment. 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. During the time of replacing the damaged oil cylinder 2 to a new one, one has to separate the link between the oil cylinder 2 and the foot support 3 by strong force (the oil cylinder 2 and the foot support 3 are tightly embedded with each other). 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.
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.
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.
The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
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The foot support 30 having a housing space 301, the aperture of the housing space 301 is slightly bigger than the sleeve 20, so that there will be a gap between the sleeve 20 and the housing space 301 when they are coupled together. And the sleeve 20 having a threaded hole 203, such threaded hole 203 is located at the bottom of the sleeve 20, and the housing space 301 also having a perforation 303 located at the bottom of the housing space 301 corresponding to the position of the threaded hole 203 of the sleeve 20. The perforation 303 passes through the foot support 30 in order to allow a screw member 50 to go through the perforation 303 and then fasten into the threaded hole 203. Furthermore, the screw member 50 can be coated with an elastic buckle 70 and a gasket 60, in order to enhance the stability of the screw member 50 during the fastening operation. As a result, the sleeve 20 and the foot support 30 can be coupled together by the security of the screw member 50. The bottom surface of the housing space 301 further has an extruded rod 304. The sleeve 20 has a concave hole 204 corresponding to the position of the extruded rod 304. The extruded rod 304 engaged with the concave hole 204 after the sleeve 20 has been inserted into the housing space 301, so as to enhance the stability of the coupling state.
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As stated above, since the oil cylinder 10 of the present invention is tightly embedded within the sleeve 20, and the sleeve 20 is coupled and is anchored with the foot support 30 by a screwing base structure which can be dismantle. Thus, when the oil cylinder 10 is damaged and needs to be replaced, the foot support 30 of the present invention can be easily separated from the sleeve 20, then replace the sleeve 20 and the oil cylinder 10 altogether. To conclude, when the oil cylinder 10 of the present invention is damaged, by taking the advantage of the improved base coupling structure between the sleeve 20 and the foot support 30, not only the speed of the replacing action can be enhanced, but also the foot support 30 can be protected from damage, allowing a reduction in service cost of the height adjustable chair.
Although the invention has been explained in relation to its preferred embodiment, it is not used to limit the invention. It is to be understood that many other possible modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention as hereinafter claimed.
