Fluid Supply Through Diverse Paths To Single Expansible Chamber Patents (Class 91/6)
  • Patent number: 4217758
    Abstract: A hydraulic brake booster is disclosed which includes an integral accumulator to provide a fluid pressure source for emergency failsafe braking. The accumulator includes a bore defined within the booster housing, and a piston slidably mounted in the bore which divides the latter into a pair of fluid compartments between opposite ends of the piston and corresponding ends of the bore. One of the compartments is communicated to the booster inlet port so that the compartment is charged with fluid pressure whenever the pressure level at the inlet port is above some predetermined low value. In one embodiment of the invention, the other compartment is communicated to the fluid pressure reservoir, and a relief valve is carried within the piston which controls flow of fluid between the two compartments.
    Type: Grant
    Filed: November 20, 1978
    Date of Patent: August 19, 1980
    Assignee: The Bendix Corporation
    Inventors: Lloyd G. Bach, Arthur K. Brown, Jr., George M. Tam
  • Patent number: 4210061
    Abstract: A three-circuit fluid system has at least one work element served by a pressurized fluid source and a plurality of work elements connected in interruptible series in each of the second and third circuits. A control system is provided for selectively diverting excess fluid from the pressurized fluid source of the first circuit to the second and third circuits in one mode of the control system and diverting excess fluid from the pressurized fluid source of the first circuit to only preselected work elements of the second and third circuits in a preselected order in another mode of the control system.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: July 1, 1980
    Assignee: Caterpillar Tractor Co.
    Inventor: Donald L. Bianchetta
  • Patent number: 4198822
    Abstract: Each directional control valve of a load responsive hydraulic system supplies a flow of signal fluid to a work port channel thereof and pressurizes this flow of signal fluid to a predetermined pressure magnitude above the load actuating pressure in the work port channel to provide a synthetic signal pressure. Fluid logic is provided for the selection of the highest synthetic signal pressure from any of the directional control valves and for application of this highest synthetic signal pressure to an effective output operator for the control of the pressure and effective output of the pump.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: April 22, 1980
    Assignee: The Scott & Fetzer Company
    Inventor: Wendell E. Miller
  • Patent number: 4181064
    Abstract: The brake booster is connected in the hydraulic circuit containing the vehicle's power steering system. It is placed downstream of the power steering gear. A multi-functional accumulator/relief valve is provided. This valve functions as the flow restriction seat portion of the control valve to normally operate the booster, provides pressure relief to limit boost pressure to a predetermined maximum, and operates to controllably release pressure of an accumulator to the booster in the event that the power steering pump is not able to adequately perform as a pressure source for the brake booster.
    Type: Grant
    Filed: April 5, 1978
    Date of Patent: January 1, 1980
    Assignee: General Motors Corporation
    Inventor: Donald M. Flory
  • Patent number: 4179980
    Abstract: A hydraulic brake booster adapted to vehicles having a manually operable control valve to control pressure increase in the booster for attaining the available braking fluid pressure in the brake wheel cylinders of the vehicles. In the booster is employed a control device to hold off a reaction force on the pedal to actuate the booster so that a properly controlled brake feel is transmitted to the vehicle operator at an initial stage of actuation of the booster. An earlier pressure rise is attained in the wheel cylinders within an otherwise vainly consumed period of time as a timelag and accordingly a safe and reliable braking operation is performed.
    Type: Grant
    Filed: March 29, 1977
    Date of Patent: December 25, 1979
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Masahiro Kito, Yoshiharu Adachi
  • Patent number: 4180462
    Abstract: A filter device wherein inlet and outlet chambers are spaced from each other by a segment of filter media is positively locked in a condition whereat the chambers are sealed with respect to each other and the atmosphere by a hydraulic power device to which hydraulic pressure fluid is delivered at a predetermined pressure value. Filtrate is then delivered to the inlet chamber at a pressure which increases in value as the filter media becomes fouled with particulate.
    Type: Grant
    Filed: December 26, 1978
    Date of Patent: December 25, 1979
    Assignee: AMSTED Industries Incorporated
    Inventor: John A. Bos
  • Patent number: 4177712
    Abstract: A single tool carrier reciprocatingly driven in opposite directions by a pair of double ended reciprocating pneumatic pistons, one of the pistons driving the carrier through rack and pinion gear means and the other piston driving the carrier through a pin integrally connected to the carrier, mounted vertically on the carrier and engaging the said other piston. Seal rings, preferably of Teflon, are mounted on both ends of both pistons. The pistons operate in opposite directions. One piston is made relatively light so that its weight and the weight of the other shoe are counterbalanced against each other.
    Type: Grant
    Filed: March 10, 1978
    Date of Patent: December 11, 1979
    Inventor: Albert M. Herzig
  • Patent number: 4154059
    Abstract: A hydraulic brake booster is disclosed which includes an integral accumulator to provide fluid pressure source for emergency failsafe braking. The accumulator includes a bore defined within the booster housing, and a piston slidably mounted in the bore which divides the latter into a pair of fluid compartments between opposite ends of the piston and corresponding ends of the bore. One of the compartments is communicated to the booster inlet port so that the compartment is charged with fluid pressure whenever the pressure level at the inlet port is above some predetermined low value. In one embodiment of the invention, the other compartment is communicated to the fluid pressure reservoir, and a relief valve is carried within the piston which controls flow of fluid between the two compartments.
    Type: Grant
    Filed: February 22, 1974
    Date of Patent: May 15, 1979
    Assignee: The Bendix Corporation
    Inventors: Lloyd G. Bach, Arthur K. Brown, Jr., George M. Tam
  • Patent number: 4142445
    Abstract: A fluid system has at least first and second circuits, each connected to a pressurized fluid source. Each circuit has at least one preselected work element connected to the fluid source through a respective preselected controlling valve. A blocker valve is connected to one of the circuits and has an actuating assembly and is of a construction sufficient for controllably passing fluid from a preselected location on one of the circuits to a preselected location on the other circuit.
    Type: Grant
    Filed: March 17, 1977
    Date of Patent: March 6, 1979
    Assignee: Caterpillar Tractor Co.
    Inventor: Kenneth R. Lohbauer
  • Patent number: 4137175
    Abstract: A filter device wherein inlet and outlet chambers are spaced from each other by a segment of filter media is positively locked in a condition whereat the chambers are sealed with respect to each other and the atmosphere by a hydraulic power device to which hydraulic pressure fluid is delivered at a predetermined pressure value. Filtrate is then delivered to the inlet chamber at a pressure which increases in value as the filter media becomes fouled with particulate.
    Type: Grant
    Filed: February 27, 1978
    Date of Patent: January 30, 1979
    Assignee: Amsted Industries Incorporated
    Inventor: John A. Bos
  • Patent number: 4135435
    Abstract: A reaction mechanism of a hydraulic control valve including a control valve for regulating hydraulic pressure by controlling hydraulic fluid disgorged from a pump, an input member mechanically connected to the control valve and operated by a driver, the input member having a smaller diameter portion and a larger diameter portion, an annular reaction regulating member into which the smaller diameter portion of the input member is slidably inserted, a diameter of the annular member being equal to or less than the larger diameter portion of the input member, a biasing member for normally urging the annular member toward the larger portion of the input member, and a member for supplying the hydraulic pressure regulated by the control valve into an area between the annular member and the large diameter portion of the input member to displace the annular member from the larger diameter portion of the input member against the biasing member.
    Type: Grant
    Filed: May 4, 1977
    Date of Patent: January 23, 1979
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventor: Yoshiharu Adachi
  • Patent number: 4112821
    Abstract: A fluid system has at least first and second circuits each having a plurality of work elements connected in interruptible series. Control elements are provided for selectively, automatically passing fluid from one circuit to preselected positions in the other circuit in response to operation of preselected work elements.
    Type: Grant
    Filed: December 3, 1976
    Date of Patent: September 12, 1978
    Assignee: Caterpillar Tractor Co.
    Inventor: Donald Louis Bianchetta
  • Patent number: 4103590
    Abstract: A filter and boot combination through which air is supplied to a pneumatically operated servomotor. The boot has a cylindrical body which is fixed to the servomotor housing and an end closure which surrounds an input push rod. The boot has a first series of openings in the end closure and a second series of openings in the cylindrical body to provide a series of air flow paths into the servomotor. A first filter is located adjacent the first series of openings and a second filter has a peripheral surface which abuts the second series of openings in the boot. A chamber is created between the inner periphery of the second filter, the first filter and the push rod. The air flows in the series of flow paths through the filters and is combined in the chamber before presentation to a control valve which regulates the operation of the servomotor in response to an input force supplied by an operator through the push rod.
    Type: Grant
    Filed: March 10, 1977
    Date of Patent: August 1, 1978
    Assignee: The Bendix Corporation
    Inventor: James Basil Putt
  • Patent number: 4096784
    Abstract: An hydraulic power system comprising a dual acting work piston adapted to be operatively connected to an external mass to be moved, the piston being instantly directionally responsive to a pair of control valves adapted to be sequentially opened and closed to actuate the work piston for movement in opposite directions, the control valves each having a series of sequentially acting valve elements which control fluid flow to and from the work piston, the system forming an hydraulic closed loop which is completely filled with fluid during both charging and discharging, the work piston and control valves working at all times against solid columns of fluid under controlled positive pressures, the system being capable of developing accelerating forces having a magnitude up to 500 G's and of being operated both directly or remotely utilizing electronic, mechanical or hydraulic actuating means with no appreciable phase lag between initial actuation and the completion of the work stroke.
    Type: Grant
    Filed: September 7, 1976
    Date of Patent: June 27, 1978
    Inventor: Theodore Ongaro
  • Patent number: 4033129
    Abstract: An hydraulic feed control system for feeding or retracting a rotary rock drill relative to the work in a selected one of four modes; namely, standard feed; regeneration feed; standard retract; and rapid retract. The system includes an hydraulic circuit controlling the feeding and retraction of feed cylinders connected to the drill; a pair of hydraulic pressure supply sources; and a pair of manipulative control valves. A primary one of the valves controls flow from one of the sources directly into the circuit; and the other control valve is selectively operable to direct flow from the other source through the primary valve into the circuit so as to combine the flow from both sources for the regeneration feed and rapid retract modes.
    Type: Grant
    Filed: June 1, 1976
    Date of Patent: July 5, 1977
    Assignee: Chicago Pneumatic Tool Company
    Inventors: Robert B. Hetzler, Gerald L. Pierson
  • Patent number: 4023466
    Abstract: An injection molding machine wherein the ram in the injection cylinder can be moved at several speeds and can be subjected to different fluid pressures by an apparatus having a two-way valve whose inlet is connectable to one or more pumps by way of discrete check valves and whose outlet is connected with a chamber of the injection cylinder by a conduit containing an electrically adjustable pressure relief valve. The valve member of the two-way valve is movable between a first position in which it completely seals the inlet from the outlet and several second positions in which it acts as a flow regulating means to permit the fluid to flow from the inlet to the outlet at a selected rate. The valve member is movable by a solenoid-operated pilot valve which cooperates with a stop extending into the path of movement of the valve member and being movable axially by a reversible motor which is controlled by the programming system of the injection molding machine.
    Type: Grant
    Filed: August 7, 1974
    Date of Patent: May 17, 1977
    Assignee: GKN Windsor GmbH
    Inventor: Herbert Strassheimer
  • Patent number: 4022269
    Abstract: In a die cast machine of the type wherein the piston of an injection cylinder is advanced by pressure gas admitted into the rear chamber of the cylinder while discharging pressurized liquid in the fore chamber, and the piston is retracted by pressurized liquid admitted into the fore chamber while forcing the gas in the rear chamber back into a gas accumulator, a control valve device is provided in the path of the pressurized liquid discharged from the fore chamber, and the control valve device is controlled so as to vary the flow quantity of the discharged pressurized liquid in accordance with the position of the piston during its forward movement. There are also provided two gas accumulators which are connected to the rear chamber of the cylinder through a valve device which is controlled so as to adjust the rate of increase of the pressure applied to the molten metal at the final stage of the injection casting operation.
    Type: Grant
    Filed: July 23, 1976
    Date of Patent: May 10, 1977
    Assignee: Toshiba Kikai Kabushiki Kaisha
    Inventor: Kazuyoshi Segawa
  • Patent number: 4006663
    Abstract: The invention relates to a hydraulic control apparatus of the type used in vehicle steering systems. In all such systems there is a reversible type hydraulic motor connected to the steering linkage. The motor has complementary expansible chambers. With the use of control means pressurized fluid is selectively delivered to one chamber which is caused to expand concomitantly with the collapsing of the other chamber from which fluid is returned to a sump. Forces transmitted to the hydraulic motor through the steering linkage by reason of the wheels striking objects such as stones or curbs cause an objectionable effect by reason of fluid being forced out of the motor back into the system. This effect is avoided by providing two valve assemblies for the two ports of the reversible motor which function in the absence of a steering command as ordinary one way check valves which prevent the undesired flow of fluid from either of the motor ports.
    Type: Grant
    Filed: April 2, 1975
    Date of Patent: February 8, 1977
    Assignee: Danfoss A/S
    Inventors: Johannes Vagn Baatrup, Thorkild Christensen
  • Patent number: 4005636
    Abstract: A hydraulic system for a working machine of the vehicle type having a power steering mechanism and a hydraulically powered working implement, such as a back-hoe implement. A hydraulic valve is inclined in the power steering mechanism, and another hydraulic valve operates the powered implement. A flow control valve divides flow between the aforementioned two valves, and a pump supplies the flow in the system. Pressure relief valves are included in the system, such that one relief valve senses pressure in the power steering branch of the system, and that relief valve responds to the lowest hydraulic pressure, and a relief valve for the powered implement responds to a higher hydraulic pressure. Only a single hydraulic pump is required for the power steering and the powered implement.
    Type: Grant
    Filed: February 13, 1975
    Date of Patent: February 1, 1977
    Assignee: J. I. Case Company
    Inventor: Donnell L. Dunn
  • Patent number: 3996838
    Abstract: Apparatus for use in a vehicle having a hydraulically actuated steering mechanism and a hydraulically actuated implement. The apparatus comprises a housing, which includes a fluid inlet port, first and second working ports, for connection with the steering mechanism, a fluid return port and an auxiliary port for connection with the implement. A metering mechanism is located in the housing, and a first valve is movably located within said housing. The first valve has a neutral position communicating the inlet with said auxiliary port and blocking the inlet from said first and second working ports. The valve also has first and second actuated positions communicating said inlet port with said metering unit and communicating flow from the metering unit to said first or second working ports respectively.
    Type: Grant
    Filed: June 4, 1975
    Date of Patent: December 14, 1976
    Assignee: TRW Inc.
    Inventor: Raymon L. Goff
  • Patent number: 3987703
    Abstract: A hydraulic control system having a load-lifting hydraulic motor, a source of pressurized fluid and a pilot-operated directional control valve for directing fluid for operation of the motor is provided with a combined restrictor and shuttle valve assembly that is operative to direct fluid from a pump for pilot-operation of the main control valve when the pump is in operation, but is operative upon failure of the pump system to provide pressure from the load-lifting side of the lifting motors to a pilot control valve for pilot operation of the directional control valve. This assembly provides an emergency source of hydraulic pilot fluid for pilot operation of the main control valve for lowering the implements or load supported by the hydraulic motors should the engine of the vehicle fail.
    Type: Grant
    Filed: August 12, 1974
    Date of Patent: October 26, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Eugene E. Latimer
  • Patent number: 3985063
    Abstract: An accumulator structure for use in a hydraulic control system for controlling an hydraulic motor utilized to engage a friction device in a transmission including an accumulator piston mounted in a housing, a source of fluid pressure, a valve connected between the source and the motor. A first conduit connects the valve and motor, the first conduit including a fluid restriction, and a second conduit connects the valve and the accumulator. A third conduit is provided between the accumulator and the first conduit. The accumulator includes a counter-bored portion defining together with a reduced land portion on said piston, a passage which connects the second conduit to the third conduit when the piston is in the inactive position to provide a rapid fluid fill of the motor initially.
    Type: Grant
    Filed: August 30, 1974
    Date of Patent: October 12, 1976
    Assignee: Borg-Warner Corporation
    Inventor: Robert W. Lemon
  • Patent number: 3974764
    Abstract: A valve for rapidly filling and emptying a volume created by rapid displacement of a machine member. The valve has a body to be connected between a reservoir and the machine. The valve has a valve seat with a seating surface that surrounds the flow path of fluid from the volume and an integral valve guide connected to the seat. A valve opening toward the machine is spring urged toward closed position to withstand high pressure of the fluid at the machine. An auxiliary mechanism is provided to open the valve which may be a solenoid, a pilot piston, or fluid cylinder or manual operation. The valve is provided with a dashpot to provide smooth operation.
    Type: Grant
    Filed: April 12, 1974
    Date of Patent: August 17, 1976
    Inventors: Edward L. Horton, Jr., Anna M. Horton
  • Patent number: 3972263
    Abstract: A flow control apparatus for use in a servomotor to control the rate of the flow of air through a hub to a control valve. A push rod has a first section connected to the control valve and a second section through which an operator supplies an operational input signal. A truncated resilient disc holds the first and second sections of the push rod away from each other. A filter surrounds the second section and extends radially to fill the interior of the hub. A series of projections extend rearwardly from the truncated resilient disc along the exterior of the filter. When the operator desires to begin a braking sequence, an input force is applied from the operator through the second section into the truncated resilient disc to the first section to actuate the control valve. With the control valve actuated, air will flow from the atmosphere through the filter into the servomotor.
    Type: Grant
    Filed: February 19, 1975
    Date of Patent: August 3, 1976
    Assignee: The Bendix Corporation
    Inventor: Harold H. Welsh, Jr.
  • Patent number: 3949783
    Abstract: A draft control valve for use with two constant displacement pumps in an open center hydraulic system. The valve controls the implement position in response to the draft loads and manual control and normally employs pressurized fluid from a low volume pump for operating in response to draft load sensing for control the implement position and employs pressurized fluid from the high volume pump for relatively short periods of time for positioning of the implement in response by the operator and extreme draft loads.
    Type: Grant
    Filed: December 24, 1974
    Date of Patent: April 13, 1976
    Assignee: Allis-Chalmers Corporation
    Inventor: John R. Plate
  • Patent number: 3941031
    Abstract: A controller for controlling the operation of an automatic machine which includes a number of pneumatically operated devices, for example a machine for blow moulding hollow glass articles, comprises a closed box containing a number of valves each of which is arranged to control one of the pneumatically operated devices of the machine. A first compressed air supply system is connected to the box for supplying compressed air to some only of the valves in the box, the remaining valves being shut-off from this system, and a second compressed air supply system is provided for supplying these remaining valves which are not supplied by the first system. Pressure relief means is also provided for de-pressurising one of the systems so that the valve supplied by this system and the devices which they control become inoperative while the other valves remain pressurised by the other system and accordingly the devices controlled by these other valves remain operative.
    Type: Grant
    Filed: November 30, 1973
    Date of Patent: March 2, 1976
    Assignee: Gerresheimer Glas Aktiengesellschaft
    Inventor: Gunter Haddenhorst
  • Patent number: 3937126
    Abstract: A hold-off resilient member for resisting movement of a plunger caused by an input force. The plunger initially moves a first control valve to permit air to enter a servomotor and develop an operational pressure differential in response to the input force. Further movement of the plunger will axially compress the resilient member as a function of input force to output force causing its peripheral surface to radially expand and actuate a second control valve. The actuation of the second control valve will permit air above atmospheric pressure to develop the operational pressure differential in response to the input force.
    Type: Grant
    Filed: March 29, 1974
    Date of Patent: February 10, 1976
    Assignee: The Bendix Corporation
    Inventors: Frederick G. Grabb, Carl D. Owens, Delbert J. Gardner
  • Patent number: RE30291
    Abstract: A vehicular power steering system including a primary hydraulic circuit for operating the steered wheels and a secondary hydraulic circuit for operating auxiliary equipment such as an implement or the like which may be attached to the vehicle. The system includes a fluid controller for controlling the flow of pressurized fluid from a power pump to the primary or steering circuit and the implement or secondary circuit. The fluid controller includes a valve mechanism which is constructed and arranged to provide the primary hydraulic circuit with pressurized fluid in the amount necessary to produce the desired steering maneuver while furnishing the secondary hydraulic circuit with the excess pressurized fluid supplied by the power pump. Thus the requirements of the primary hydraulic circuit may be always satisfied and have priority over the requirements of the secondary circuit in all modes of operation. .Iadd.
    Type: Grant
    Filed: June 16, 1978
    Date of Patent: June 3, 1980
    Assignee: TRW Inc.
    Inventors: Raymon L. Goff, Jim L. Rau