Showing papers on "Hydraulic machinery published in 1976"

Means for activating hydraulic motors

Abstract: At least one device for generating power from sunlight, wind and/or water movement supplies power to a hydraulic pump which uses such power to pump hydraulic fluid to a tank which receives and stores the hydraulic fluid under a constant pressure. The hydraulic fluid stored within the tank is allowed to selectively pass to a hydraulic motor whereby the hydraulic motor is activated.

Francis-type hydraulic machine

Abstract: The disclosure concerns a Francis-type hydraulic machine, i.e., a turbine, pump-turbine or pump, having a bladed wheel of large diameter, and in which bearing apparatus for supporting the rotor is arranged in a peripheral region of the bladed wheel spaced radially from the axis.

Hydraulically controlled artificial leg

Abstract: An artificial leg comprising a hydraulic system which is connected to a pushing rod of an ankle cap through a transfer rod, a foot which bears a recess to accept one end of the pushing rod and a knee part with its two ends separately connected to an outer shell and a pole means of the hydraulic system wherein the hydraulic system functions through a series of mechanical operations to automatically control the straightening and bending of the knee joint of the artificial leg.

Litter frame with supporting platform which can be raised by hydraulic or pneumatic jack

Abstract: A litter frame having a supporting platform is adapted to be raised by a hydraulic or pneumatic jack. A common pneumatic or hydraulic system is provided to both raise the platform and to provide spring suspension for the same. Where a common hydro-pneumatic system is provided, the jack assembly is actuated by a hydraulic medium, while a hydro-pneumatic cushioning assembly is loaded by the hydraulic medium. The hydraulic medium is delivered to both the jack and the hydro-pneumatic system from the same hydraulic supply.

Wear particle detector

Abstract: A wear particle detector for use with hydraulic systems, capable of collecting wear particles formerly suspended in the hydraulic fluid and of discriminating between larger and smaller particles by indicating the former, but destroying the latter automatically without causing detection, whereby both device functions are connected to and energized by the same single electric power supply and indicating circuit.

Load sensitive hydraulic system

Abstract: A load sensitive hydraulic system having a variable displacement pump, a priority dependent work circuit, at least one secondary work circuit, priority means preferencing fluid flow to the priority dependent work circuit over the secondary work circuit, flow and pressure compensating means responsive to requirements of either work circuit for controlling displacement of the variable displacement pump and a relief valve, when overriden, allowing fluid flow to the secondary work circuit.

Part throttle control {13 {0 pump override

Abstract: A hydraulic power system having a plurality of variable displacement pumps for supplying pressurized fluid for manipulation of an implement includes control means operative to automatically adjust pump displacement to the output horsepower of a prime mover driving the pumps of a system. The control system includes underspeed valve means responsive to a deviation in the speed of the prime mover from a predetermined normal speed to transmit a fluid pressure signal to a servo control means for adjusting the displacement of the pumps. The underspeed valve means includes adjusting means for adjusting the underspeed valve to respond to a deviation from other engine speeds different from the normal operating speed.

Hydraulic brake booster

Abstract: A hydraulic brake booster of the type utilizing pressurized fluid supplied to a hydraulic power steering device, wherein a flow regulating valve is adapted to rapidly increase the pressure in a power chamber of the booster in response to actuation of the booster and another flow regulating valve is adapted to ensure supply of the pressurized fluid to the power steering device, and wherein an accumulator is adapted to surely operate the booster even when pressure supply to the power chamber from the fluid pressure source is accidentally blocked or stopped.

High pressure hydraulic system

Abstract: Two hydraulic pressure intensifiers are coupled in parallel between a source of hydraulic fluid at relatively low pressure and an output path. Each intensifier provides a pressurizing stroke in only one direction of linear reciprocation. The intensifiers are so operated, under the control of a hydraulic circuit, as to create a tendency for an initial portion of the pressurizing stroke of each of the intensifiers to overlap a final portion of a preceding pressurizing stroke of the other intensifier, and thereby to deliver high pressure hydraulic fluid to the output path simultaneously with continuing delivery from such other intensifier. Such simultaneous delivery does not actually occur, however, since the hydraulic circuit is so arranged that the delivery of high pressure hydraulic fluid from each intensifier to the output line can begin only upon a falling off in the pressure provided by the other intensifier. Meanwhile, as soon as the pressure in the hydraulic fluid flowing from such other intensifier to the output line begins to fall off, such flow at decreasing pressure is interrupted. A surge-free flow of hydraulic fluid at a relatively high pressure is, thus, continuously present in the output line.

Hydraulic system of a skid steer loader

Abstract: A skid steer loader comprising an improved loader main frame and including an operator's compartment designed to present a low profile vehicle particularly suitable for low clearance applications. A improved hydraulic system for the vehicle includes a new arrangement of an implement pump interconnected with the hydraulic drive pumps of the steering system of the vehicle. An internal connection between the drive pumps and the implement pump substantially improves the flow of hydraulic fluid through the system by providing an internal passage for flow of excess hydraulic fluid from a drive pump to the implement pump to supply the implement pump with inlet fluid.

Constant pressure sealed fluid storage tank for hydraulic systems

Abstract: A closed rigid tank stores oil or other liquid for use in operating hydraulic jacks or other fluid-driven devices. A flexible bladder within the tank is coupled to a source of compressed air and to an air pressure regulator in order to maintain a constant positive pressure in the tank as the bladder expands and contracts in response to the withdrawal and return of oil. The sealed regulated pressure tank may be smaller, lighter and less costly than the tank structures heretofore used in hydraulic systems and the construction is more adaptable to variations in tank shape and location relative to other system components. Fluid lines which connect the tank and fluid pump may be smaller and the total volume of oil required for the hydraulic system may be reduced.

Vehicle steering system

Abstract: A vehicle steering system comprises a source of fluid, a hydraulic steering motor actuatable to effect vehicle steering, and a steering control valve in fluid communication with the source of fluid and with the steering motor. The steering control valve is operable to direct fluid from the source of fluid to the steering motor. A metering mechanism is connected in fluid communication with the steering control valve and the steering motor. The metering mechanism is manually operable in accordance with the operator's demand for steering, and a hydraulic system is responsive to demand for steering fluid by the metering means to increase the output flow of the fluid from the source of fluid to the metering means at a pressure sufficient only to effect steering action against a variable load.

Control system for high pressure hydraulic system

Abstract: In a high pressure liquid system such as those commonly used for cleaning and scaling, a feed pump is connected in series with a high pressure pump. The discharge from the high pressure pump is controlled by a fail-safe pressure responsive valve which is responsive to feed pump pressure.

Demand compensated hydraulic system with pilot line pressure-maintaining valve

Abstract: A hydraulic system having pilot line fluid feedback from a fluid motor to valving which operates to change pump output to compensate for motor demand includes a pressure regulator valve for maintaining a predetermined minimum pressure in the pilot line. The pressure regulator valve eliminates the power wasting pressure differential which normally exists between the pump output and the fluid motor demand in demand compensated hydraulic systems.

Implement with automatic sequencing valve and system

Abstract: An implement such as a tractor-propelled, multi-row planter having row markers hingedly mounted on opposite sides is provided with an automatically operating hydraulic sequencing valve for alternately actuating the markers. The sequencing valve is adapted to be readily connected with the hydraulic system of the tractor used to raise and lower the implement. If desired the hydraulic circuit may be arranged so that the sequencing valve is automatically actuated or sequenced when the implement is raised and lowered whereby the oppositely mounted markers are alternately raised and lowered automatically with the raising and lowering of the implement itself.

Automatic hydraulic shut-off system

Abstract: A hydraulic safety system for use with a hydraulic valve and a work apparatus which is retained under hydraulic pressure even when the hydraulic line is broken inadvertently. A lock valve is connected in the line and senses the loss of hydraulic pressure, and the valve is actuated in response to the pressure drop and retains the work apparatus in a pressurized condition to thereby avoid undesired movement in response to the loss of pressure.

Hydraulic clamp for trays of canned beverages

Abstract: A grapple clamp for lifting a group of objects such as a plurality of cases of soft drinks. The clamp has four clamp jaws hinged to a frame in rectangular or square orientation so as to engage a group of objects with equal force from four sides. The clamp is adapted to be carried by a fork lift truck and each pair of opposing jaw clamps is actuated by a hydraulic or pneumatic cylinder. Preferably, hydraulic cylinders are used which are powered by the hydraulic system of the lift truck. The cylinders are interconnected so that the clamping forces exerted by the two pairs of clamp jaws are equalized.

Dual pump hydraulic control system with predetermined flow crossover provision

Abstract: A dual pump hydraulic control system with a predetermined flow crossover provision is disclosed including a first hydraulic control circuit having a first source of fluid pressure, a first motor, a first distributor valve in communication with the first source and moveable into an actuating condition for directing fluid to the first motor, a second motor, a second distributor valve in interrupted series communication with the first distributor valve and moveable into an actuating condition for directing fluid to the second motor; a second hydraulic control circuit having a second source of fluid pressure, a third motor, a third distributor valve in communication with the second source for directing fluid to the third motor; and a crossover valve and resolver network responsive to the actuating condition of the first distributor valve and to the actuating condition of the second distributor valve for communicating fluid from the second source to the second motor to supplement fluid from the first source to the second motor while preventing full fluid flow from both the first and second sources thereto. Such hydraulic system is particularly adapted to simultaneous swing and stick-in movement of a hydraulic excavator.

Hydraulic drilling machine

Abstract: A hydraulic drilling machine for cutting into rock formations and the like. The machine has a rotating drill rod with a bit at one end and a rotary hydraulic drive motor at the other end. The drill rod is supported on a carriage adapted for linear travel to advance the rotating bit into the rock formation. The carriage is extended and retracted by means of a hydraulic feed motor. The rotary hydraulic motor and the hydraulic feed motor are connected in series in the hydraulic operating system so that when rotation resistance increases accompanied by a greater pressure drop across the rotary hydraulic motor, there is a consequent decrease in the force exerted by the hydraulic feed motor in order to avoid jamming of the drill bit.

Fluid power transmission system

Abstract: A fluid reservoir for hydraulic power systems comprises a tank divided into a liquid compartment and an air compartment by a flexible diaphragm so that the liquid will be pressurized by compressed air in the air compartment. The tank is supported in a stationary frame upon horizontal pivots and a balancing spring. The liquid inlet and outlet connections pass through the pivots. An indicator is provided for showing the vertical position of the tank relative to the frame on the balancing spring and thus indicating the amount of liquid in the tank.

Variable differential pressure unloading valve apparatus

Abstract: Variable differential pressure control apparatus is used in a hydraulic system including a pump, an accumulator for receiving hydraulic fluid under pressure from the pump and for discharging hydraulic fluid to a work device, and an unloading valve in the circuit between the pump and the accumulator for regulating pressure of the fluid to the accumulator. The control apparatus is connected with the unloading valve for opening and closing the latter and is adjustable (1) for selectively setting the maximum fluid pressure to the accumulator and (2) for selectively setting the variation between the maximum pressure to the accumulator, at which pressure the unloading valve will open, and the minimum pressure to the accumulator at which pressure the unloading valve will close for recharging the accumulator.

Pressure actuated signal fluid control for load responsive systems

Abstract: A hydraulic system includes a fluid responsive means that controls the effective output of the pump in response to pressurization of signal fluid that is supplied by the pump. The signal fluid is pressurized by flowing through a synthetic signal generator and on into a fluid motor in opposition to the working pressure therein. This signal fluid is directed to the fluid motor by the directional control valve when the directional control valve is in an operating position; and it is directed to a sump by the directional control valve when the directional control valve is in a standby position. The present invention provides pressure actuated means to divert or occlude this signal fluid from the directional control valve except when the directional control valve provides a load sensing flow path which communicates this signal fluid to the fluid motor.

Hydraulic tapping apparatus

Abstract: Apparatus for heavy duty tapping operations includes a compact, lightweight, hydraulic tool unit and a remote hydraulic power unit, with the entire apparatus being designed for portability. The tool unit includes an elongated housing having a high torque, low speed hydraulic motor with internal reduction gearing, for directly driving a spindle supported in the housing for rotation and longitudinal movement. The spindle includes a lead screw coacting with a lead nut mounted at the spindle end of the housing. The spindle is directly driven by the motor drive shaft through a spline drive coupling; and the spindle is fully supported by the lead nut and drive coupling. Reversing and stop control devices control the tapping and retracting limits of movement of the spindle; and the design provides for minimum damage to the tool unit in the event of failure of the reversing or stop control devices. The remote power unit includes a reservoir for hydraulic fluid, a hydraulic pump and electric drive motor, reversing valve, and electric controls for operating the tool unit.

Vehicle hydraulic power operating system

Abstract: A hydraulic system for a vehicle having an open center type braking booster and the other hydraulic operating system e.g. power steering having open center type valve mechanism, both being in fluid communication with a discharging port of an engine driven pump for receiving input fluid flow through a flow divider. The invention provides, at an early stage of the braking operation, means for fluid communication between the discharge port of the power steering system and the inlet port of the booster other than communication between the discharging port of the flow divider and the inlet port of the booster.

Magnetically-controlled press. regulator for hydraulic systems - has positive linear action using low vol. precontrol loop

Abstract: The magnetically-controlled pressure regulating valve for hydraulic actuators operates with only a small vol. of oil in order to control larger volumes of hydraulic oil in the main mechanism. The output press. is directly proportional to the electric control signal input and is independent of variations in the supply oil pressure. Feed oil is supplied to a chamber surrounding the lower part of the main piston and flows through a drilling and choke orifice to a pre-control chamber above the piston. Return flow from this chamber is controlled by the needle valve operated by an electromagnet mounted above the valve. The return feed pipe is connected to a chamber surrounding the upper part of the piston and to the main return pipeline. The piston has a central cross-drilling corresponding with the edges of the two circular chambers.

Hydraulic system for an automatic transmission of an automotive vehicle

Abstract: An automotive vehicle has an automatic transmission to which fluid is supplied from a source through a control valve having a body which is displaceable to control the flow of the fluid to the load constituted by this tranmission. A plurality of binarily stepped pilot faces are provided on one side of the valve body and the other side is connectable to the source of fluid pressure. A plurality of pressurizable chambers at each of the surfaces are each connected via a respective line to a respective solenoid valve itself connected to the high-pressure side of this system. Binary actuation of these pilot surfaces via the solenoid valves in accordance with motor speed allows the transmission very smoothly to be upshifted and downshifted.

Agricultural implement hydraulic system

Abstract: A pull-type harvesting machine in the form of a baler has a vertically adjustable windrow pickup mechanism and a generally fore-and-aft laterally swingable tongue that connects the baler to a towing tractor, lateral adjustment of the tongue causing the baler to shift between a transport position behind the tractor and an operating position wherein the pickup mechanism is disposed outwardly of the tractor. The positions of the tongue and the header are respectively controlled by a pair of two-way hydraulic cylinders, and the flow of pressurized fluid between the cylinders and the tractor hydraulic system is controlled by a single control valve on the tractor, the cylinders being connected in parallel. A pair of solenoid-actuated valves are disposed in the hydraulic lines on the opposite sides of the cylinder that controls the tongue, the solenoid valves being powered by the tractor electrical system and controlled by a switch on the tractor so that the operator can selectively lock out the tongue control cylinder, whereby the pickup mechanism and the tongue can simultaneously be adjusted from their transport to their operating condition or the pickup mechanism can be vertically adjusted independent of the tongue.