Abstract:
The present invention relates to a tandem pneumatic/hydraulic reciprocating cylinder with an integral oil reservoir. The invention may be used to impart reciprocating motion to adjustable apparatus used in the cleaning and polishing of roll assemblies.
Abstract:
A hydraulic-pneumatic cylinder device of the invention comprises a tubular housing closed at both ends, and an actuating piston slidably guided in the housing and connected to a piston rod. A pair of hydraulic units, each of which comprises a pair of volume-variable liquid chambers in communication with each other through a flow control passage, are arranged within the housing on both sides of the piston to act thereon in opposite axial directions. A pair of air chambers, which are selectively connectable to an air supply source, are also provided within the housing to act on the respective hydraulic units. Operation of the cylinder device can be reliably adjusted by a flow regulating valve provided at each flow control passage.
Abstract:
An active pneumatic mechanism and a passive hydraulic mechanism of the apparatus are so connected with each other and with a driven member that movement imparted by the pneumatic mechanism to the driven member produces, and is controllable by restriction of, hydraulic fluid flow within the hydraulic mechanism. Restriction of the fluid flow to any desired extent is accomplished by command signals directed by a control computer to a valve that preferably is of the type actuable by a torque motor. The command signals produced by the computer are based upon a correlation of data supplied by a computer program with data supplied by a monitor of the positions of the driven member along its path of travel. Precise control of the speeds, accelerations and positions of the driven member are realized.
Abstract:
An air pressure actuator comprises an air pressure cylinder having a piston slidable therein. A brake is provided at a position where the air pressure cylinder and piston make relative movement, thus stopping their movement. When the movement of the piston in the cylinder is to be halted at a predetermined position, this is effected by the brake so as to constrain the piston correctly relative to the air pressure cylinder. Said brake is formed by an hydraulic cylinder and an hydraulic piston actuated in association with relative movement of the air pressure cylinder and air pressure piston. Alternatively the brake is formed by a retractable braking element housed in the air pressure piston.
Abstract:
A two-piston cylinder unit with air actuation through two separate parts controlling one piston, the other piston in an oil-filled speed control section. The hydraulic cylinder controls, or limits, the speed or movement of the air cylinder, and a specified speed rate may be achieved for any section or part of the total or complete movement by means of in-built control rods and cooperating aperture.