Securing device for positioning a seat post of office chairs

Details Securing device for positioning a seat post of office chairs Securing device for positioning a seat post of office chairs

2001-06-08

2003-06-17

Cuomo, Peter M. (Department: 3636)

Supports

Stand

Understructure

C248S188100, C248S519000, C403S373000, C403S374300

Reexamination Certificate

active

06578804

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a securing device comprising two clamp members with two expanding members are connected therebetween and a seat post is clamped between the two clamp members. A releasing member is engaged with one of the clamp members.
BACKGROUND OF THE INVENTION
A conventional office chair generally includes a securing device that controls the position of the seat. The conventional securing device involves a hydraulic cylinder and the seat post is connected to the piston rod of the cylinder so that when the users operate the hydraulic cylinder, the seat post is lowered or raised by the movement of the piston rod. However, the cylinder is expensive and has a potential problem of leakage of the liquid in the cylinder. Besides, the number of parts composing the cylinder is large and every part has to be machined to have suitable holes. All of these make the office chair to have a high price and cannot be popular for most of the customers. In other words, there are no office chairs, in the market having adjustable height of the seat and sold at lower price.
The present invention intends to provide an office chair that has a securing device for holding the seat post and the securing device includes a simple structure.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided an office chair and comprises a seat with a seat post extending from an underside of the seat. A base has tube and a plurality of legs extend from the tube. A recess is defined in the tube and a securing device is received in the recess. The securing device comprises two clamp members which are connected by two expandable members which bias the clamp members in opposite directions. A cover is mounted to the base and the seat post extends through the cover and clamped by the two clamp members. A releasing member extends through the cover and engages with one of the two clamp members.
The primary object of the present invention is to provide an office chair that has a seat height adjustable feature and the mechanism for controlling the seat post is simple.


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