Patent ID: 7513570

Claim:
In a chair comprising an adjustment mechanism which includes a pneumatic cylinder unit having a pneumatic cylinder and an actuator part cooperating with said cylinder, said actuator part being movable axially along an actuator axis to engage and release said cylinder and thereby engage and release said chair adjustment mechanism, said chair further including an actuator mechanism for selectively moving said actuator part along said actuator axis, said actuator mechanism comprising a fixed block stationarily mounted proximate to said actuator part and a rotatable drive block rotatably supported by said fixed block so as to be rotatable about a rotation axis and displaceable axially along said rotation axis, said drive block being operatively connected to said actuator part, said fixed block and said drive block including respective opposing cam surfaces which cooperate together such that rotation of said drive block about said rotation axis effects axial displacement of said drive block along said rotation axis into engagement with said actuator part to move said actuator part along said actuator axis.