Patents by Inventor John R. Plate

John R. Plate has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5813697
    Abstract: Disclosed herein is a vehicle including a frame, and a stabilizer apparatus including a pressure source, first and second fluid-actuated stabilizer assemblies connected respectively to the front and rear axles shiftably moveable on the frame, one of the first and second stabilizer assemblies normally being locked against extension and contraction in the absence of pressurization thereof by the pressure source, and the other of the first and second stabilizer assemblies normally being free to extend and contract in the absence of pressurization thereof by the pressure source, hydraulic circuit connected between the pressure source and the first and second fluid activated stabilizer assemblies and including flow controller operable between a first mode wherein the pressure source is disconnected from the first and second stabilizer assemblies, whereby the one of the stabilizer assemblies is locked against extension and retraction, thereby locking the axle connected thereto against shifting movement relative to
    Type: Grant
    Filed: March 3, 1997
    Date of Patent: September 29, 1998
    Assignee: Trak International, Inc.
    Inventors: J. Scott Bargenquast, Terry A. Weber, John R. Plate
  • Patent number: 5639119
    Abstract: Disclosed herein is a vehicle including a frame, and a stabilizer apparatus including a pressure source, first and second fluid-actuated stabilizer assemblies connected respectively to the front and rear axles shiftably moveable on the frame, one of the first and second stabilizer assemblies normally being locked against extension and contraction in the absence of pressurization thereof by the pressure source, and the other of the first and second stabilizer assemblies normally being free to extend and contract in the absence of pressurization thereof by the pressure source, a hydraulic circuit connected between the pressure source and the first and second fluid activated stabilizer assemblies and including a flow controller operable between a first mode wherein the pressure source is disconnected from the first and second stabilizer assemblies, whereby the one of the stabilizer assemblies is locked against extension and retraction, thereby locking the axle connected thereto against shifting movement relative
    Type: Grant
    Filed: December 5, 1994
    Date of Patent: June 17, 1997
    Assignee: Trak International, Inc.
    Inventors: John R. Plate, J. Scott Bargenquast, Terry A. Weber
  • Patent number: 5230399
    Abstract: A vehicle having at least four wheels comprising a pair of front wheels and a pair of rear wheels, first and second reversible hydraulic cylinders coupled respectively to the front wheels for turning the same and third and fourth hydraulic cylinders coupled respectively to the rear wheels for turning the same, a hydraulic pressure source, a hydraulic circuit for selectively coupling each of the cylinders to the hydraulic pressure source for simultaneously turning the front and rear wheels whereby the vehicle may be turned in either a right-hand or a left-hand direction.
    Type: Grant
    Filed: November 21, 1991
    Date of Patent: July 27, 1993
    Assignee: Trak International, Inc.
    Inventor: John R. Plate
  • Patent number: 5052532
    Abstract: A brake system for a vehicle includes a pump coupled to a service brake through a brake pedal valve and to a parking brake by a four-way solenoid valve which also couples the pump to a transmission disconnect valve. Activation of the solenoid valve couples the parking brake to the pump for placing the parking brake in an off mode and actuates the transmission disconnect valve to couple a transmission pump to a transmission valve. Deactivation of the solenoid valve disconnects the parking brake and operates the transmission disconnect valve to disconnect the transmission so that the vehicle cannot be driven when the parking brake is on. A check valve connects the parking brake to the brake pedal valve so that the service brake can be operated when the pump is deactivated.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: October 1, 1991
    Assignee: Trak International, Inc.
    Inventor: John R. Plate
  • Patent number: 4513850
    Abstract: An electrohydraulic control system for a pair of hydraulically actuated vehicle transmission clutches operable to effect high and low speed ranges. High and low hydraulic clutch valves are pilot operated by a solenoid valve which delivers pressurized fluid to pressure chambers associated with the flow control elements of the clutch valves. The solenoid valve is controlled by a circuit which includes a relay operated switch, a manually operated switch controlling the relay operated switch and a clutch pedal operated switch in series with the manually operated switch. The relay operated switch opens when the clutch pedal is operated thereby causing the transmission to be in a low speed condition when inching the vehicle.
    Type: Grant
    Filed: February 9, 1983
    Date of Patent: April 30, 1985
    Assignee: Allis-Chalmers Corporation
    Inventor: John R. Plate
  • Patent number: 4279334
    Abstract: A mechanical detent release for a power shift transmission selector valve operating through a mechanical linkage connected to the clutch pedal operating the inching valve. The mechanical detent releases in response to a spring in the transmission selector valve spool engaging a cam on the clutch pedal of the inching valve which permits the selector valve to return to the low speed position when the inching valve is operated.
    Type: Grant
    Filed: August 6, 1979
    Date of Patent: July 21, 1981
    Assignee: Allis-Chalmers Corporation
    Inventors: John R. Plate, James H. Lucas
  • Patent number: 4073200
    Abstract: A cable retainer for locking the sheath of a sheathed cable in a pivotal position on a support.
    Type: Grant
    Filed: August 9, 1976
    Date of Patent: February 14, 1978
    Assignee: Allis-Chalmers Corporation
    Inventors: John R. Plate, James H. Lucas
  • Patent number: 4023646
    Abstract: A load sensitive hydraulic system for operating auxiliary equipment on a vehicle with a priority flow control valve to provide priority pressure in operating a regenerative steering circuit of the hydraulic system. The regenerative hydraulic steering circuit provides load sensing and utilizes single source of pressurized fluid which responds to various loads in the hydraulic system. A priority valve assures that the steering demands are met before providing adequate pressure for all other auxiliary functions.
    Type: Grant
    Filed: November 24, 1975
    Date of Patent: May 17, 1977
    Assignee: Allis-Chalmers Corporation
    Inventors: Charles P. Heisig, John R. Plate
  • Patent number: 4016949
    Abstract: A control valve operated by the steering wheel to selectively connect a variable displacement pump for operating a hydraulic cylinder in each of two directions to steer the vehicle. The hydrostatic system is regenerative in steering of the hydraulic cylinder in one direction since both sides of the hydraulic cylinder are connected to the high pressure input line in steering in one direction. A pilot line is connected to the valve output to sense load pressure and feed back to the compensator of the variable displacement pump to vary the displacement in response to load demands of the hydrostatic system.
    Type: Grant
    Filed: November 24, 1975
    Date of Patent: April 12, 1977
    Assignee: Allis-Chalmers Corporation
    Inventors: John R. Plate, Charles P. Heisig
  • 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: RE39477
    Abstract: Disclosed herein is a vehicle including a frame, and a stabilizer apparatus including a pressure source, first and second fluid-actuated stabilizer assemblies connected respectively to the front and rear axles shiftably moveable on the frame, one of the first and second stabilizer assemblies normally being locked against extension and contraction in the absence of pressurization thereof by the pressure source, and the other of the first and second stabilizer assemblies normally being free to extend and contract in the absence of pressurization thereof by the pressure source, a hydraulic circuit connected between the pressure source and the first and second fluid activated stabilizer assemblies and including a flow controller operable between a first mode wherein the pressure source is disconnected from the first and second stabilizer assemblies, whereby the one of the stabilizer assemblies is locked against extension and retraction, thereby locking the axle connected thereto against shifting movement relative
    Type: Grant
    Filed: June 17, 1999
    Date of Patent: January 23, 2007
    Assignee: JLG OmniQuip, Inc.
    Inventors: Sandra J. Nellers, J. Scott Bargenquast, Terry A. Weber, John R. Plate