Patent ID: 8616352

Claim:
A height adjustable suspension unit comprising: a shock absorber having a cylinder and an extensible rod disposed in the cylinder to be able to advance and retract, the extensible rod having an end portion that is coupled to a chassis; a coil spring and mounted around the extensible rod, the coil spring having a lower end supported on a spring base that is attached to the upper end of the cylinder; a lifting and lowering mechanism including: a gear mechanism; a power conversion section that converts power transmitted from the gear mechanism into power move the cylinder up and down; and a guide section that guides the up and down movement of the cylinder; the gear mechanism including: a worm having: shaft portions provided at both ends of the worm; a connection portion that is provided at one end of one of the shaft portions for connection with a manual operation handle; and a projecting portion that is mounted on an end portion close to the one end of the one of the shaft portions the project portion projecting orthogonal to the axis of the one of the shaft portions; and a wheel gear that meshes with the worm, the wheel gear being, mounted on the cylinder at such a location as to provide a stroke length; a support that rotatably supports one end of one of the shaft portions of the worm; and a presser member that is provided for bringing an end surface of the projecting portion into press-contact with the end surface of the support to such an extent as to allow the projecting portion to he released from the press-contact with the support by manual pressing.