Patents Represented by Attorney Frank L. Hart

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  • Controlled priority fluid system of a crawler type vehicle
    Patent number: 3987623
    Abstract: An improved fluid system of a crawler type vehicle has control means for selectively passing fluid in a preselected sequence to a plurality of work elements.
    Type: Grant
    Filed: January 23, 1976
    Date of Patent: October 26, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Donald L. Bianchetta
  • Controls for multiple variable displacement pumps
    Patent number: 3987626
    Abstract: Fluid is selectively, controllably delivered at substantially common rates from separate respective variable displacement pumps in response to a load pressure signal acting on a single pump control valve serving said pumps.
    Type: Grant
    Filed: January 23, 1976
    Date of Patent: October 26, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Donald L. Bianchetta
  • Load controlled fluid system having parallel work elements
    Patent number: 3987622
    Abstract: Apparatus of a fluid system of a work vehicle for controlling the fluid delivered to parallel work elements of the vehicle in response to the load exerted on the fluid system by the work elements.
    Type: Grant
    Filed: February 2, 1976
    Date of Patent: October 26, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Howard L. Johnson
  • Mast assembly
    Patent number: 3987870
    Abstract: A mast assembly has pulley means associated with sheaves of a lift chain for maintaining a hydraulic hose of the mast assembly at a protected position adjacent the chain.
    Type: Grant
    Filed: November 3, 1975
    Date of Patent: October 26, 1976
    Assignee: Towmotor Corporation
    Inventor: Elias Wojtyna
  • Fluid system of a work vehicle having fluid combining means
    Patent number: 3987704
    Abstract: A fluid system for work elements of a work vehicle has first and second fluid circuits each having a pump connected to a work element through a control valve assembly that is operated by a pilot pump. A control means is provided for controllably passing fluid between the first and second fluid circuits in response to power demands of said circuits.
    Type: Grant
    Filed: February 27, 1976
    Date of Patent: October 26, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Howard L. Johnson
  • Disc brake assembly and method of using same
    Patent number: 3983964
    Abstract: A disc brake assembly of a vehicle has an actuator for actuating the disc brake and a housing that is positioned about the actuator. An element is provided for observing an identification mark positioned at a preselected location on the actuator adjacent a port of the housing. In the method of the invention, the brake of the vehicle is used and worn brake discs are replaced in response to the mark on the actuator being at a location spaced at least a preselected distance from the location of the mark prior to wear of the brake discs.
    Type: Grant
    Filed: October 14, 1975
    Date of Patent: October 5, 1976
    Assignee: Caterpillar Tractor Co.
    Inventors: Duane E. Beals, Robert C. Wraight
  • Apparatus for controlling work element operating pressures in a fluid system
    Patent number: 3982469
    Abstract: A fluid system of a vehicle has means for reducing waste by separately controlling the maximum operating pressure of separate portions of the fluid system serving work elements of the vehicle.
    Type: Grant
    Filed: January 23, 1976
    Date of Patent: September 28, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Donald L. Bianchetta
  • Vehicle hood assembly
    Patent number: 3981375
    Abstract: A hood of a vehicle has an aligning assembly for returning a pivotal hood to a preselected position over a portion of the vehicle.
    Type: Grant
    Filed: November 3, 1975
    Date of Patent: September 21, 1976
    Assignee: Towmotor Corporation
    Inventor: John T. Crawford
  • Vehicle protection means
    Patent number: 3981376
    Abstract: A vehicle having a drive shaft and a "U" joint positioned adjacent a transmission housing has a protection element positioned between the "U" joint and the transmission housing to protect the transmission housing from damage.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: September 21, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Albert E. Kluge, Jr.
  • Movable step of a vehicle
    Patent number: 3981515
    Abstract: A vehicle has a step that is vertically movable for protecting the step against damage. Pivot means and restraining means of the step are positioned for avoiding damage.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: September 21, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Dean E. Rosborough
  • Vehicle speed control apparatus and method
    Patent number: 3978666
    Abstract: Apparatus and method for controlling the velocity of an engine driven vehicle having a hydraulic system pump driven by the engine. Means are provided for controllably restricting the passage of fluid from the pump of the hydraulic system for controllably loading the engine and thereby controlling the velocity of the vehicle.
    Type: Grant
    Filed: September 11, 1975
    Date of Patent: September 7, 1976
    Assignee: Caterpillar Tractor Co.
    Inventors: Kenneth W. Kelly, Wayne A. Peterson
  • Track wheel for crawler type vehicles
    Patent number: 3979154
    Abstract: A track wheel of a crawler type vehicle has a plurality of first and second plates spaced at preselected locations for suppressing vibration of and resultant noise emitting from panels of the wheel.
    Type: Grant
    Filed: October 14, 1975
    Date of Patent: September 7, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Eugene R. Groff
  • Apparatus for positioning pin fins of a finned-tube heat exchanger
    Patent number: 3964286
    Abstract: An apparatus for contacting and bending preselected pin fins of a finned-tube heat exchanger to preselected locations. First and second toothed wheels positioned on opposed sides of respective first and second pin fin rows bend the pins in response to moving a finned tube through a base opening. A wheel contacts the finned tube between the rows of pin fins and urges the tube into forcible engagement with a base.
    Type: Grant
    Filed: June 23, 1975
    Date of Patent: June 22, 1976
    Assignee: General Electric Company
    Inventors: Charles J. Oerther, Joseph B. Osborn