Abstract: A reduced-noise pneumatic motor has a housing with a cap disposed at a first end, the cap having an air inlet; a base disposed at a second end, the base having an air outlet hole formed therein and configured to at least partially receive a noise damping system, and a piston pump extending therethrough; and bolts extending from the cap to the base to secure the cap and the base to the housing. A pneumatic piston is disposed within the housing, and includes a shuttle valve situated within a central bore of the pneumatic piston. A piston rod has a first end extending into the piston pump and a second end secured to a spring which biases the piston rod against the pneumatic piston.

Abstract: A cryogenic hydraulic reciprocating piston pump includes a casing which defines a piston chamber. The sidewall of the piston chamber includes a retraction spill port as well as a pumping spill port. At the end of a retraction stroke, a retraction spill passageway that extends through the piston becomes aligned with the retraction spill port and fluid is communicated from the pressurized side of the piston to the unpressurized side of the piston to stop the retraction stroke before the piston “bottoms out”. Similarly, at the end of a pumping stroke, a pumping spill passageway that extends through the piston becomes aligned with the pumping spill port which provides communication between the pressurized side of the piston and the unpressurized side of the piston thereby stopping movement of the piston before it “bottoms out”.

Abstract: A hydraulic motor with rotating shaft coupled to a piston with alternating rectilinear displacement. The hydraulic motor comprises a casing enclosing a rotating shaft, a piston and an inverter comprising a first sleeve formed as one piece with the piston, a second sleeve, fixed in position, and a distributor mounted so as to rotate in the interior of the second sleeve and conduit and hole elements arranged between the second sleeve and the distributor and means for controlling the rotation of the distributor as a function of the displacement of the first sleeve so as to invert the direction of displacement of the piston.

Abstract: A linear fluid piston device not requiring a fluid valve to operate and has operating piston stroke capabilities beyond traditional vibration fluid devices. The linear fluid device features (a) a movable piston means for linear motion, (b) a feature wherein said body provides rotational movement for fluid port alignment and a pressure vessel containing an (c) end cap and (d) cavity sized to guide the movable piston. In the improvement, the moveable piston provides a method for changing the linear direction in the event the total linear piston movement has not completed.

Abstract: A valveless, double acting, positive displacement fluid transfer device is operable either as a pump when driven by a power source, or as a motor when the fluid working portion is driven by fluid under pressure through the inlet and outlet ports of the device. The device is based upon the principle of a plunger and cylinder which are angularly offset from a rotary shaft, and connected to the rotary shaft by radial arm and a spherical bearing. The plunger simultaneously rotates and reciprocates as the rotary shaft revolves, due to the plunger stroke varying cyclically due to the angular offset, as the plunger rotates within the cylinder. The plunger includes separate internal inlet and outlet passages therethrough, which cyclically communicate with an inlet port and an opposite coaxial outlet port in the cylinder to provide both suction and discharge with each plunger stroke.

Abstract: A direct action fluid motor and injection pump is disclosed which injects small quantities of a second fluid into a primary fluid stream. A housing has an inlet and an outlet connected to a primary fluid conduit. The housing contains a stepped piston which reciprocates in response to the fluid pressure applied alternately to the closed small and large face of the piston. A valve set alternately closes one and opens the other of the faces. A valve positioner carried with the piston is held in alternate stable positions by cooperating springs on the valve positioner and a post in the piston. Stop members are located above and below the piston travel, each associated with an actuating spring. The valve positioner is preshifted at the end of the stroke, using the full force of the piston, by stop members to move the valve positioner and valve set to an intermediate unstable position.

Abstract: A reciprocating primary fluid driven motor has a stepped piston in a housing having a center hanging actuator rod which extends into the piston to periodically cooperate with an axially shiftable connector member in the piston which operates valves which establish the reciprocating stroke of the piston by opening and closing valve members on the larger and smaller faces of the stepped piston. A block member with compression spring drivers pivotally mounted inside the piston slides on the actuator rod during movement of the piston. The drivers are compressed in response to spaced stops on the actuator rod during continued movement of the piston until a sudden over-center movement of the block member shifts the connector to operate the valve members to cause reciprocation of the piston. Quiet operation during shifting is provided by shock absorbers. No sliding seal with the actuator rod is necessary. Provision for bleeding air from the housing chamber facilitates startup.

Abstract: Hydraulic engine with piston moving inside a chamber, the working and reversing controls being inside the piston.Said engine comprises a piston (6) which is provided with an annular chamber (15) into which the fluid is admitted through two conduits (13 and 14). From said chamber (15), the fluid passes through the conduit (17), the groove (19) and the conduit (21) and then through the reversing valve (22a) and from there via the conduits (28,29) into the lower chamber (2a). The fluid contained into the upper chamber (2b) is removed through the conduits (30 and 31) traverses the valve (22a) and arrives through the conduit (32) into the groove (33). It is then removed through the conduit (34) and the chamber (35) surrounding the column (4) towards two exhaust channels (37 and 36).This engine finds an application in driving the slide valve of a self-cleaning filter.

Abstract: An air-hydraulic pump wherein an air-motor drives the pump. The air-motor includes a reciprocal piston which is driven in one direction by fluid under pressure and is returned by a spring. A control valve is utilized to control the action of fluid under pressure on the piston with the control valve having an open position which is maintained by trapped fluid pressure within a piston chamber in which the control valve is positioned. The control valve is closed by physical contact thereof with an end wall of the cylinder movably mounting the piston at the end of the return stroke and a resilient member is positioned adjacent the cylinder end wall to maintain the control valve in closed position for a portion of the piston stroke as it moves away from the cylinder end wall in the pumping stroke to avoid a possible stall condition for the motor.

Abstract: A rock drill having a hydraulic pressure reservoir formed by the drill housing, and an anvil rotation mechanism enclosed in the housing. A piston of substantial length and a mechanical hydro-operated valve means, provide favorable pulse duration and low impact velocity. The piston has only two sliding seal diameters which permits simplified valve and cylinder configuration. The friction surfaces of the fronthead drill assembly are lubricated and cooled by integration with the circulating hydraulic system. A floating seal cartridge between the piston and anvil, tends to rotate the piston with the anvil to minimize rotative scrubbing at impact.

Abstract: An improved fluid motor having only two moving components, a reciprocatable piston and a fluid actuated valve spool. The piston is supported for linear movement in a piston support bore of a barrel assembly, and is moved in alternating directions by the operation of selected porting of a pressure fluid selectively admitted against differential piston pressure faces. The valve spool is disposed in an inner bore in the piston and is alternately driven in opposing directions by automatically controlled and selective application of fluid pressure. The fluid motor experiences no mechanical impact between the valve spool and the piston.