Abstract: The invention relates to a freely activatable hydraulic valve control device for a stroke valve, which valve control device is arranged particularly in an internal-combustion engine. The stroke valve includes a valve stem and a first spring acting on the valve stem in the valve-closing direction as well as a second spring acting at least periodically on the valve stem in the valve-opening direction. The valve stem is connected at least to a control piston arranged in a working space and capable of being loaded on two sides with a working fluid. The pressure of the working fluid in the working space can be regulated via a pressure source together with a switching valve and a supply conduit.

Abstract: A device for sensing actuator operating signal in a hydraulic system is disclosed. The device has auxiliary valves directly coupled to the directional control valves respectively, the internal lines of which auxiliary valves are opened or become orifices in accordance with positions of spools of their associated directional control valves. A fluid line extends from a hydraulic pump to a return tank after passing the auxiliary valves in a series. The device also has two elements for detecting fluid pressure at two given points along the fluid line. An additional orifice is formed in the hydraulic line between the auxiliary valves and the pressure detecting elements is provided in the hydraulic line before and after the additional orifice.

Abstract: A tube clamp includes a cylindrical resilient plastic body containing an axial mounting hole and having four tube receptacles arranged with a first pair on one side of the axis and with a second pair being respectively located in diametrically opposite locations from the first pair. Each receptacle includes an entryway leading to a tube-receiving portion defined by a cylindrical wall sized for snugly receiving a given tube and into which the tube may be snap-fit and retained without the use of fasteners. When shipping a tube bundle for use on equipment provided with hydraulic cylinders, as many clamps are used along the length of the bundle as are necessary to keep the tubes separated one from another, these same clamps being used to mount the clamps to structure of the equipment by inserting mounting bolts through the clamp mounting holes.

Abstract: The clutch actuation system provides for control of the clutch of a manual transmission in a motor vehicle. By use of hydraulics, a vacuum booster and a gradual pressure relief valve a smooth easy control of the manual transmission is accomplished. The vacuum booster provides an assist to the hydraulic system when the clutch must be disengaged or engaged. The power assist facilitates rapid engagement of the clutch and gears. The gradual pressure relief valve provides for a smooth transition in the hydraulic system to engage and disengage the clutch. The rapid smooth assist is aided by the vacuum system of the motor vehicle. For certain motor vehicles the engine oil system is also used to assist.

Abstract: Method and apparatus for compressing gas. Two accumulators are alternately filled with gas from a gas-supplying conduit, and the gas is forced out of one end of the accumulators into a gas-receiving conduit by liquid forced into the other end of the accumulators. A reversible pump moves liquid from one accumulator to the other accumulator. The reversible pump is connected so that pump cavitation is prevented. The invention includes a switching system to switch liquid flow from one accumulator to the other accumulator. Liquid that leaks from the system may be resupplied using a liquid supply system that comprises a pressure container with a compressible element.

Abstract: A reciprocating floor conveyor has at least three groups of one or more individually reciprocatable slat members. A drive engages each slat group and moves more than half of the slat members simultaneously in a conveying direction and moves the remainder of the slat members in the opposite direction at least at about twice the rate of speed. The drive includes a fluid pressure source, a flow divider connected to the fluid pressure source which provides a separate, equal rate of flow for each slat group, a separate extensible fluid driven cylinder for reciprocation of each slat group that is connected to a separate flow from the flow divider, a direction valve for each fluid driven cylinder which controls fluid flow into and out of the cylinder, and an unloading valve communicating with the interconnected rod sides of the fluid driven cylinders.

Abstract: A hydraulic circuit for a backhoe loader having two double-acting cylinders for the arm and bucket of the loader and respective directional valves for the cylinders. There are heavy demands on the oil pump of the system when the two cylinders are moved simultaneously from one extreme position to another which requires substantially two whole cylinder volumes of oil. The cylinders are arranged in parallel relative to the pump. A first source of pressure medium displaced from one cylinder is used to perform work in the other cylinder and the other cylinder is also supplied with a second source of pressure medium directly from a pump. The line section through which the first source of pressure medium is supplied is shunted to a tank by valving apparatus upon a predetermined pressure being reached to freely accommodate the simultaneous movements of the cylinders.

Abstract: An automatic actuating system for actuators of excavator. The system of this invention automatically controls the bucket which is overloaded to be free from the overloaded state thereof, the bucket to maintain an angular position with respect to the absolute line of the ground surface so as to prevent the objects contained in the bucket from being dropped, the bucket cylinder and the boom cylinder to accomplish the desired surface finishing operation by handling for the dipper cylinder, actuators to limit the operational ranges thereof, optimal quantity of hydraulic fluid flow of the main hydraulic pumps for respective actuators, and the pre-running for the actuators.

Abstract: A tappet valve arrangement for a railway car coupler having a main valve for supplying air pressure from one railway car to another coupled railway car. A piston and cylinder valve for supplying air pressure to a coupler centering device when the railway is in an uncoupled state and for interrupting the flow of air to the coupler centering device when the railway car is in a coupled state. A negating spool valve for overriding the flow of air to the coupler centering device when the railway car is in an uncoupled state. A shut-off valve for interrupting the supply of air from one railway car to another railway car when it is desired to uncouple the railway cars.

Abstract: An actuator for a friction clutch having a diaphragm includes coupling means comprising a first part associated with the clutch actuating linkage, and a second part associated with the actuator proper. The actuator, of the fluid operated type, comprises a main piston working in a main cylinder and defining with it a control chamber. A secondary piston works within the hollow bore of the main piston to define within the latter a wear compensating chamber. The main piston carries a shut-off valve for bringing the control chamber and the wear compensation chamber into communication with each other when the clutch is in its engaged position. The actuator also includes a booster spring for applying additional force to the diaphragm, such that the characteristic of the diaphragm has a positive gradient over the whole travel between the engaged and disengaged positions of the clutch.

Abstract: A method of manufacturing a tandem brake booster wherein a rearwall is derived from the separation plate of a single brake booster. The separation plate is modified by creating a passageway therethrough and using splines on the hub which are mated with keyways in a cylindrical body that extends from a front movable wall to assure that passages between the resulting front and rear chambers are aligned. A return spring holds a seal between the cylindrical body and hub to assure cross communication does not occur between the passageways. Thereafter, any operational pressure differential created during a brake application is directed into the development of an output force to effect a brake application.

Abstract: A proportional distributor embodying a controlled slide valve and a pressure compensator slide valve associated with additional positioning means whereby the pressure drop in the controlled slide valve depends upon the difference between the working and load sensing pressures according to a linear function with a strictly positive coefficient and a strictly negative constant. Each compensator slide valve operates according to the same linear function or at least one of its proportional distributors has a compensator slide valve operating according to a different linear function.

Abstract: Method and apparatus for compressing gas. Two accumulators are alternately filled with gas from a gas-supplying conduit, and the gas is forced out of one end of the accumulators into a gas-receiving conduit by liquid forced into the other end of the accumulators. A reversible pump moves liquid from one accumulator to the other accumulator. The reversible pump is connected so that pump cavitation is prevented. The invention includes a switching system to switch liquid flow from one accumulator to the other accumulator. Liquid that leaks from the system may be resupplied using a liquid supply system that comprises a pressure container with a compressible element.

Abstract: A hydraulic circuit system comprising a hydraulic-fluid supply source, at least one hydraulic actuator operated by hydraulic fluid from the hydraulic-fluid supply source, a flow control valve for controlling the flow of the hydraulic fluid to be supplied to the actuator and a pressure control element for maintaining the differential pressure across the flow control valve at a predetermined value.

Abstract: The present invention is concerned with a working machine in the form of a construction machine including booms 2 and a bucket 4 such as a wheel loader, a shovel loader or the like. When a scooping operation is performed by alternately repeating a tilting operation with the use of only a bucket operation lever 16 while a boom operation lever 15 is held at a boom kick-out position, a lifting operation for the booms 2 and a tilting operation for the bucket 4 while the boom operation lever 15 is shifted to a neutral position, a lift speed of the booms 2 is variably controlled to a speed corresponding to a tilt speed of the bucket or an angle of the booms whereby the tilt speed is harmonized with the boom speed.

Abstract: A dual axis actuator consisting of two fluid cylinders having the fluid inputs to the cylinders connected in parallel to a source of pressurized fluid, resulting in an automatic sequencing of cylinder rod drives. The cylinder rod encountering the least resistance to motion extends first until it reaches a stop, followed by the extension of the second cylinder rod. In the preferred embodiment of the invention, the source of fluid input to the two fluid cylinders is derived from the fluid port of a third fluid cylinder having its cylinder rod driven by an external power source. By utilizing two port fluid cylinders, the dual axis actuator can be adapted to provide a sequence of drives for powering workpiece transferring units in a multiple workstation transfer press. Such a system provides an automatic sequencing of translations for engaging and lifting workpieces for movement to a subsequent work station, followed by lowering and retracting from workpieces to allow the next stroke of the press.

Abstract: A closed hydraulic system (22) is provided for transmitting steering movement to a rear wheel steering assembly (16) in response to steering movement of a front wheel steering assembly (14). The front wheel steering assembly is controlled by a steering wheel (18) and a power steering assembly (20). The closed hydraulic system (22) includes a pump assembly (56) and an actuator assembly (58) connected together by conduits (60,62) to define closed fluid flow branches (164,166) for moving a piston (112) in the actuator assembly in response to movement of a piston (78) in the pump assembly. Movement of the actuator piston is transmitted to the rear wheel steering assembly via first and second cam assemblies (122,124) which effect same direction rear wheel steering for rather small front wheel steering angles and which effect opposite direction rear wheel steering for greater front wheel steering angles.

Abstract: The present invention is directed to a mechanical hydraulic pressure dampening devices for use in a steering system of an articulated self-propelled work vehicle. The dampening devices are hydraulically positioned between the steering cylinders of the work vehicle and absorb hydraulic pressure spikes in the steering system. In the preferred embodiment, the pressure dampener comprises a pressure accumulator that is fluidly coupled to the steering cylinder by a shuttle check valve. The shuttle check valve shifts in response to a pressure spike so that it can be absorbed by the pressure accumulator. In a second embodiment, the pressure dampener comprises a cylinder having two pistons that are biased into a normal position by a spring extending between the pistons. Spaces are formed on either side of the pistons and are hydraulically coupled to the steering cylinders. A central space formed between the two pistons is hydraulically coupled to a sump return line.

Abstract: A vehicle barricade comprises a frame to which a barrier plate is pivotally mounted for being moved between a passage and a blocking position. First and second hydraulic motors operably interconnect the plate and the frame. An hydraulic power supply is operably connected with the hydraulic motors and includes an uninterrupted line for assuring constant power supply to the first hydraulic motor for thereby biasing the first hydraulic motor into extension and control valve means for selectively supplying power to the second motor for thereby causing selective pivoting of the plate.

Abstract: A drilling apparatus of the type having a drilling mast and a transfer arm mounted at a first axis adjacent the mast to move between a lower position near ground level and an upper position aligned with the mast is provided with a reaction point anchor fixed with respect to the drilling mast and spaced from the first axis. A fixed length link is pivotably mounted to the transfer arm at a second axis, spaced from the first axis, and a first single stage cylinder is pivotably mounted at one end to the distal end of the link and at the other end to the transfer arm. A second single stage hydraulic cylinder is pivotably mounted at one end to the distal end of the link and at the other end to the reaction point.

Abstract: Arm and fork mechanism for moving a refuse retainer with respect to a refuse container which has an opening in the upper portion thereof. Arms are pivotally mounted adjacent the refuse container. The arms are movable between a position adjacent a side portion of the refuse container and are also movable to a position above the refuse container. A plurality of forks is supported by the arms and angularly movable with respect to the arms. A fluid motor is operably joined to the arms and operably joined to the forks for angularly moving the forks with respect to the arms. The fluid motor is provided with a plurality of operation positions. Thus, the forks are angularly movable by the fluid motor to any one of a plurality of angular positions for lifting and dumping a refuse retainer.

Abstract: A fluid operated cylinder device particularly adapted to lift a load relative to a load support includes a hollow casing having a closed end for attachment to the load support; an elongated rigid rod extending lengthwise of the casing and having a first end arranged within the casing and rigidly fixed to its closed end and a second end disposed outwardly of the casing for attachment to the load support; at least one open ended fluid operated cylinder arranged intermediate the casing and rod for sliding movements lengthwise thereof, such cylinder having an outer end disposed outwardly of the casing for attachment to the load; and fluid means for introducing and withdrawing fluid from the casing for effecting sliding movements of the cylinder and lifting and lowering of the load. Single and double acting embodiments of the cylinder device are disclosed.

Abstract: A triaxial hinge for robots, mechanical handling apparatus and the like comprising three different kinematic elements, namely, a first, a second and a third element, of which the first element on the arm of the handling apparatus or robot is rotatably secured around a first axis while the kinematic elements that follow are substantially disposed in continuation of the respective preceding element and each having a rotation axis, wherein each one of the kinematic elements has on its outer end a receiving flange to which is secured the kinematic element that follows, and said three kinematic elements can be hydraulically driven separately or independently of each other.

Abstract: A hydraulic control circuit especially for use with multi-function hydraulic devices, such as for industrial lift truck attachments, in which a combination of valve means are adapted to operate two or more hydraulic systems, the valve system being designed such that a minimum number of hydraulic conduits are required to connect the main hydraulic system to the hydraulic devices, as from a lift truck to an attachment supporting carriage on a lift truck upright, and no electric lines are required to be connected to switching devices between the hydraulic devices, such as to solenoid operated valves.

Abstract: A hydraulic system for a drilling apparatus where torque is transmitted to drill pipe, a plurality of thrust cylinders move the torque transmitter back and forth along the drill pipe axis, and a hydraulic motor supplies torque to the torque transmitter, includes: a first drive pump for supplying hydraulic fluid to the motor; a first valve between the first drive pump and motor for selectively controlling the direction of fluid flowing to the motor; a second drive pump for selectively supplying fluid either to the thrust cylinders or motor; a second valve between the second drive pump, on one side, and the thrust cylinders and motor, on the other side, for selectively diverting fluid flow from the second pump either to the thrust cylinders or the motor; a third pump for supplying fluid to the thrust cylinders; a third valve connected between the second and third pumps, on one side, and the thrust cylinders, on the other side, for selectively controlling the direction of fluid flowing to the thrust cylinders; a

Abstract: A feed beam for a rock drill comprises a box girder (13), a saddle (10) slidable along the box girder, and two power units (20,20a) inserted into the ends of the box girder.Each power unit comprises a pair of fixed pulleys (22,24) located outside the end of the box girder, an hydraulic jack (26) carrying a pair of movable pulleys (28,30) within the box girder, and a cable coupled between the power unit and the saddle and passing over the four pulleys.

Abstract: A control device serves to control the fluid flow to and from double-acting rams, especially the rams of mining machinery, the control device having various internal ducts which are defined between two plates connected together. One of the two plates (a duct plate) has a main face formed with channels, some of which radiate outwardly from a ring of bores, and two of which are `T`-shaped and extend generally tangential to the ring of bores. The other plate (a connecting plate) closes the channels to define ducts and has bores communicating with the various ducts. Control valve units are detachably connected to the connecting plate, the control valve units being arranged to be actuated to effect desired connections between the various ducts by way of the bores in the connecting plate.

Abstract: A fluid pressure actuator having a first member, a second member adapted to rotate relative to the first member, and a third member adapted to move on the second member. One of the first member and the second member is formed thereon with two flanges disposed in spaced-apart relationship for closing opposite ends of a first pressure chamber defined between the first and second members. The flanges are each formed in the outer periphery thereof with a groove communicating with passages formed in the first and second members for supplying therethrough power for moving the third member. The actuator is small in volume, dispenses with piping located outside the actuator, and is easy to provide a fluid seal thereto.

Abstract: A control device for controlling hydraulically actuated equipment, the device comprising a fluid distributing block and a plurality of control valve units detachably mounted side-by-side on the block, the block being formed with an inlet opening, an outlet opening, a plurality of control line openings, a plurality of delivery openings, a plurality of return openings, a plurality of valve unit communicating openings, and internal passage means, the said internal passage means connecting the inlet opening with each of the delivery openings, connecting the outlet opening with each of the return openings, and connecting the control line opening with respective corresponding ones of the valve unit communicating openings.

Abstract: A valve assembly is provided in which a first poppet member and at least one subsequent poppet member each having a valve face engageable with a valve seat between first and second passages. A first and a subsequent pilot valve is operative for selectively establishing communication between a fluid reservoir and a space at one side of a piston portion of each poppet member and a pair of restricted flow passages are provided in each poppet member between such space and the first and second passages, such restricted flow passages being preferably formed in the poppet members with ball check valves provided therein. Such restricted flow passages operate upon closure of the pilot valve to develop a static pressure in the space corresponding to the pressure in the one of the first and second passage which has the higher pressure therein so as to move the poppet member to and hold it in its closed position in response to pressures applied from either of the first and second passages.

Abstract: A pilot-operated valve structure for controlling high pressure fluid flow relative to a pair of cylinders, each having an extend port and a retract port. The valve structure has a pair of pilot-operated 3-way valves, each with a poppet valve member and with pilot valve structure including pilot lines directed to the 3-way valves and to the retract ports of the cylinders. The pilot valve has multiple positions including a neutral position whereby pilot pressure may be directed to the 3-way valves for positioning thereof and to the retract ports of the cylinder for holding the pistons in the cylinders retracted or causing retraction of a piston of an extended cylinder. Two alternate positions of the pilot valve cause positioning of one or the other of the 3-way valves to cause extension of the piston in the associated cylinder while the piston in the other cylinder is maintained in retracted position.

Abstract: A fluid pressure actuated drive for providing for the closing unit of an injection moulding machine a to and fro traversing motion of a movable part of the unit with little force and a clamping of the closed unit with a greater force. The device has at least two double acting piston and cylinder devices which act in parallel and the pistons of which each have at each side a piston rod which passes through a seal in the responsive adjacent cylinder end. The piston rod on one side of at least one piston is thicker than that on its other side and the piston rod on one side, which corresponds to the same working side as one side of the one piston, of the or each other piston is thinner than that on its other side. Traverse in one direction is provided by applying fluid pressure to both sides of the one piston, and in the other direction by providing fluid pressure to both sides of the other piston. Clamping pressure is provided by applying fluid pressure to one side only of each of the pistons.

Abstract: A hydraulic actuator having two balanced area actuator pistons, each controlled by the movement of a primary servo sleeve to supply pressurized fluid from a pressure fluid source to one side of the actuator piston and to allow return flow from the opposite side of the piston. Piston movement is reversed by translation of the primary servo sleeve. A blocking valve is in each flow line between the servo sleeve and the cylinders in which each piston moves. A flow channel from the pressure fluid source applies pressure to the shut off valves to maintain the valves normally open for flow of control fluid to and from the actuator pistons. Means, operable upon loss of fluid pressure, are provided for closing the shut off valves to maintain existing pressure on both sides of the actuator pistons automatically to maintain reactive loads in each actuator half.

Abstract: A hydraulic brake booster includes a spool valve within a housing for communicating fluid pressure into a chamber for urging a piston in a direction actuating a master cylinder, thereby effecting a brake application. The communication between an inlet passage and the chamber is regulated by a land on the spool valve cooperating with a corresponding land on the housing. In order to prevent particles which are carried in the pressurized fluid from wedging in the interface between the land and the corresponding housing land, an additional land is provided on the spool valve. The additional land cooperates with another land on the housing to form a small clearance therebetween so that large particles in the fluid are prevented from wedging in the interface between the sensitive land and the corresponding land on the housing when the valve is in the brake-released position.

Abstract: A hydraulic control system for use with a vehicle having an earthworking implement and having a plurality of components operated by hydraulic motor means having hydraulic release type brakes associated therewith and including means responsive to actuation of the brake for precluding operation of the motor associated therewith and responsive to release of the brake for permitting operation of the motor.

Abstract: A mechanism for moving a slidable load carrier to and fro along a trailer includes a hydraulic double-acting servomotor having a piston rod which selectively engages with one or other of two sets of oppositely directed lugs, in the form of ratchet teeth, carried by a channel member fixed to the underside of the load carrier. The hydraulic servomotor is pivotally mounted on the trailer. The sets of ratchet teeth engaged are selected, for movement in either a forward direction or backward direction, by adjusting the angle of inclination of the hydraulic servomotor in a vertical plane. The hydraulic servomotor is controlled by a pneumatic servomotor coupled through a horizontally extending operating rod. The pneumatic control servomotor has a diaphragm disposed in a vertical plane in a casing which is provided at the bottom with a drain valve for removing water condensed within the interior.

Abstract: A multiway hydraulic valve comprising a valve housing having a cylindrical bore, a first and second inlet, an outlet, a first series and second series of operation ports all defined in the valve housing. Check means are associated with the first and second inlets and with each operation port of said first and second series of operation ports. A spool member is positioned axially slideable and rotatable within the cylindrical bore having operation means associated therewith adapted to open a selected operation port of one of said series of operation ports allowing it to vent through said outlet while at the same time pressurizing only the operation ports of the other series of operation ports. Sealing means to seal the spool member within the cylindrical bore in a fluid-tight relation and stop means to limit the axial movement of the spool member are also provided.

Abstract: An actuator, and a system employing the same, which will continue to operate after deformation of a portion thereof which deformation would normally restrict movement between the piston and cylinder of the actuator. The piston or gland of the actuator is constructed so as to include segmented flanges which will fracture responsive to forces applied to them upon engagement of the deformation. Slots defining the segments are filled with a rubber-like material which is bonded to the piston or gland thus providing a solid structure to enable appropriate sealing while not interfering with the fracturability of the segments.