Abstract: An actuating force generating device has a multi-stage cylinder body consisting of a plurality of cylinders having different diameters and arranged in series; a plurality of pistons slidably fitted in the cylinders, respectively; fluid ports each provided in the cylinders to discharge or introduce fluid from or into the cylinders; a container provided in the rear of the multi-stage cylinder body; a piston rod forming an actuating end projecting from the multi-stage cylinder body, said rod extending through a rod guide and being affixed to the forward piston; and a resilient member adapted to urge the rearmost piston forwardly.

Abstract: A reciprocating screw injection molding machine characterized in that the screw is actuated by coaxial hydraulic rotary and linear motors, and in that a movable mold supporting platen has a clamping piston thereon which is reciprocable in a clamping cylinder, the latter having mounted thereon platen and valve actuating cylinders which are operatively secured to the clamping piston and to a valve member respectively to effect movement of the clamping piston and movable mold supporting platen toward and away from a fixed mold supporting platen and to open the valve member for flow of oil from a prefill tank into the clamping cylinder chamber and vice versa, said valve actuating cylinder further being operative upon closing of the mold to close the valve and to admit fluid under pressure into the clamping cylinder chamber to pressurize the trapped fluid therein to lock the clamping piston and movable mold supporting platen in mold closing position with required tonnage for injection of plasticized material into

Abstract: The hydraulic controller is for controlling the operation of a plurality of hydraulically controlled devices. Hydraulic fluid may be selectively distributed by the controller to various controlled hydraulic devices in a timed and predetermined sequence. The timing of the distribution of hydraulic fluid by the controller can be quickly and easily varied by various control knobs on the controller to thereby vary the timed operated period of the various machine operations controlled by such devices without affecting the timed operation of other machine operations. The controller is supplied with a source of hydraulic fluid under a generally constant pressure. Cam means are associated with each of a plurality of fluid flow distributing valves for operating such associated valve members in a predetermined sequence of valve positions upon advancement of the cam means relative thereto.