Abstract: Provided is a height adjustable suspension unit that can smoothly lift and lower a vehicle body without the need to supply fluid to a shock absorber. The height adjustable suspension unit includes: a shock absorber S having a cylinder 1 and an extensible rod 2 disposed in the cylinder 1 to be able to advance and retract, the extensible rod 2 having an end portion that is coupled to a chassis X; a coil spring 4 mounted around the extensible rod 2, the coil spring 4 having a lower end supported on a spring base 3 that is attached to the upper end of the cylinder 1; and a lifting and lowering mechanism D including a gear mechanism A that is rotationally driven by a power source, a power conversion section B that converts power transmitted from the gear mechanism A into power to move the cylinder 1 up and down, and a guide section C that guides the up and down movement of the cylinder 1.

Abstract: A multiple spindle dividing head in which each spindle is driven in synchronism from a common drive shaft adapted to be driven from a single source of power which may be pneumatic, hydraulic or electrical, the spindles being moved automatically from an open to a closed work-piece engaging position by pneumatic or hydraulically actuated means which maintain the spindles in the closed position as they are rotated and yet permit the spindles to be readily opened in any rotative position to release the work-pieces engaged thereby.