Lifting device for chair arm rest, has spring prestressed between cam follower and lower end of pulling handle and fixed on handle, where spring presses handle in direction of locking unit

摘要

The device has a pulling handle, which is connected with a locking unit to rotate the unit relative to a guide rail. The handle is movably mounted in an inner tube (23) and has a lower end extending through a cam follower. A control knob is movably fixed at an upper end of the tube (23) and is connected with an upper end of the handle to move the handle. A spring is prestressed between the cam follower and the lower end of the handle, and is fixed on the handle. The spring presses the handle in the direction of the locking unit.