Patent ID: 6974185

Claim:
A chair comprising: a seat; two legs pivotally interconnected to each other; two transverse bars horizontally and securely attached to a bottom face of the seat; a first cross bar securely and firmly formed on one of the two legs and sandwiched between the two transverse bars, the first cross bar having two spring-driven positioning levers respectively and selectively extending out of two distal ends of the first cross bar and into two mutually corresponding and aligned adjusting holes defined in inner side faces of the two transverse bars to fix a position of the first cross bar relative to the seat; a second cross bar securely and firmly formed on the other one of the two legs and sandwiched between the two transverse bars, the second cross bar having two securing blocks extending out of two distal ends of the second cross bar and into corresponding two securing holes defined in the inner side faces of the two transverse bars so as to secure a position of the second cross bar relative to the seat, the two securing blocks being selectively retracted inside the second cross bar and having escaped the corresponding securing holes, and a handle is pivotally mounted at the bottom face of the seat to operably connect to the two securing blocks so that the pivotal movement of the handle is able to drive the two securing blocks to move, whereby the chair height is able to be adjusted by moving the second cross bar to different securing holes.