Patents Represented by Attorney Frank L. Hart

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  • Shoe assembly
    Patent number: 4014581
    Abstract: A shoe assembly of a continuous track of a crawler type vehicle has a vibration damping assembly substantially covering a surface of the shoe to damp shoe vibrations. The vibration damping assembly has at least one plate extending over the surface of the shoe and a viscoelastic material positioned between said shoe and plate for connecting the plate to the shoe.
    Type: Grant
    Filed: October 14, 1975
    Date of Patent: March 29, 1977
    Assignee: Caterpillar Tractor Co.
    Inventor: Eugene R. Groff
  • Heat pipe cooling of a rotary engine rotor
    Patent number: 4014631
    Abstract: Improved structure for cooling the rotor of a rotary engine wherein a heat pipe structure is provided extending inwardly from an outer portion of the rotor for transferring heat inwardly to a heat transfer structure within the rotor. Heat is transferred through the heat transfer structure from the heat pipe to lubricant coolant flowed through a grooved wall inwardly of the heat pipe and outwardly of the rotor bearing. In the illustrated embodiment, the heat pipe is provided with a body of water for effecting the desired heat transfer from the rotor apex.
    Type: Grant
    Filed: December 1, 1975
    Date of Patent: March 29, 1977
    Assignee: Caterpillar Tractor Co.
    Inventor: Alexander Goloff
  • Pump control assembly having adjustable biasing means
    Patent number: 4013381
    Abstract: A pump control assembly for a variable displacement pump has adjustable biasing means for providing improved control of the pump.
    Type: Grant
    Filed: February 9, 1976
    Date of Patent: March 22, 1977
    Assignee: Caterpillar Tractor Co.
    Inventors: Allyn J. Hein, William D. McMillan, Walter Z. Ruseff
  • Lift chain equalizing device
    Patent number: 4010825
    Abstract: A material handling vehicle has a generally vertically movable carriage, first and second spaced apart, chain assemblies connected to the carriage, and a power device associated with the chain assemblies for generally vertically moving the first ends of the chain assemblies and the carriage in response thereto. A pivot element is associated with the chain assemblies for controlling relative movement thereof.
    Type: Grant
    Filed: April 5, 1976
    Date of Patent: March 8, 1977
    Assignee: Towmotor Corporation
    Inventor: Charles R. Chelin
  • Throttling slot configuration for a valve spool
    Patent number: 4009864
    Abstract: A throttling slot is formed in a control valve spool and interconnects a reduced diameter portion and a peripheral surface of a land provided on the spool with the throttling slot including a pocket recessed into the land at an angle inclined in the direction opposite to the normal direction of movement of the spool for effecting fluid flow through the throttling slot, and a longitudinally extending groove from the pocket which terminates in an end intersecting the reduced diameter portion.
    Type: Grant
    Filed: February 4, 1975
    Date of Patent: March 1, 1977
    Assignee: Caterpillar Tractor Co.
    Inventor: Lawrence F. Schexnayder
  • Blade control apparatus of a motor grader including wand vibration damping element
    Patent number: 4009758
    Abstract: An improved control apparatus of a motor grader for maintaining the grader blade relative to a reference line has a biasing element connected to an actuating wand and associated with the reference line for urging the reference line toward the actuating wand of the controls at a preselected force for damping undesirable vibrations of the wand.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: March 1, 1977
    Assignee: Caterpillar Tractor Co.
    Inventor: William R. Tillman
  • Two-way bulldozer mechanism
    Patent number: 4008771
    Abstract: A two-way bulldozer mechanism for mounting on a forwardly extending push frame of an earthmoving vehicle is provided with a reversible blade assembly having opposite upper and lower blade portions hinged together by a central hinge connection formed therebetween. An elongated lever has a central pivot connection for pivotally mounting the lever to the push frame and a lower end thereof pivotally mounted to the blade assembly in coaxial relation to the hinge connection.
    Type: Grant
    Filed: July 30, 1975
    Date of Patent: February 22, 1977
    Assignee: Caterpillar Mitsubishi Ltd.
    Inventor: Uchida Tomio
  • Carriage assembly of a vehicle
    Patent number: 3999675
    Abstract: An improved carriage of a vehicle has slide blocks of organic plastic for maintaining the carriage correctly positioned relative to the frame and for movably connecting first and second frames of the carriage together for translatory movement of the second frame.
    Type: Grant
    Filed: November 28, 1975
    Date of Patent: December 28, 1976
    Assignee: Towmotor Corporation
    Inventors: James E. Forry, Cyril J. Nisbett
  • Method for assembling a lift truck mast
    Patent number: 3999267
    Abstract: A method for assembling a lift truck mast having a slider element positioned within a channel element.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: December 28, 1976
    Assignee: Towmotor Corporation
    Inventors: Edward V. Leskovec, Wayne T. Wiblin
  • Interconnected pump control means of a plurality of pumps
    Patent number: 3999892
    Abstract: A pump assembly having at least two variable displacement pumps each having a separate pump control assembly are interconnected for control in response one to the other. Each pump control assembly has first and second biasing means acting on a respective swash plate. The first and second biasing means have interconnecting fluid pathways formed through a pump control housing. Means are provided within the housings for modifying the discharge pressures of the separate pumps to provide a resultant pressure signal for controlling the second biasing means.
    Type: Grant
    Filed: February 9, 1976
    Date of Patent: December 28, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Allyn J. Hein
  • Connecting element for moving means
    Patent number: 3998488
    Abstract: Apparatus for controllably connecting lifting means to an item for moving said item to and from relatively inaccessible locations.
    Type: Grant
    Filed: April 12, 1976
    Date of Patent: December 21, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Virgil R. C. Durgan
  • Mechanically, laterally adjustable treads for crawler vehicles
    Patent number: 3998286
    Abstract: A crawler type vehicle has unique means for connecting roller frames with associated track to the car body for mechanical movement of the roller frames and associated track outwardly from the vehicle for selectively providing a wider work base for the vehicle. The connecting means of a construction sufficient for assuring desired connections of the roller frames to the car body at first and second positions of the roller frames and associated track.
    Type: Grant
    Filed: November 19, 1975
    Date of Patent: December 21, 1976
    Assignee: Caterpillar Tractor Co.
    Inventors: Zdenek Ponikelsky, Gerard M. G. J. Collignon
  • Three-pump - three-circuit fluid system of a work vehicle having controlled fluid-combining means
    Patent number: 3998053
    Abstract: A fluid system of work elements of a work vehicle has first, second, and third fluid circuits each having a pump connected to a work element through a control valve assembly that is operated by a pilot pump. A fluid control means is provided for controllably combining fluid from each of the circuits with another one of the circuits.
    Type: Grant
    Filed: March 15, 1976
    Date of Patent: December 21, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Howard L. Johnson
  • Step-grab element system for a vehicle
    Patent number: 3997183
    Abstract: A step-grab element system is provided for ascending to or descending from an elevated position on a vehicle. A step and a grab element are each pivotally connected to the vehicle and are connected to one another for moving the step between an operable position and an inoperable, protected position in response to moving the grab element between an operable position and an inoperable, protected position.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: December 14, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: James W. Russey
  • Apparatus for harvesting a tree
    Patent number: 3994325
    Abstract: In an improved method and apparatus for harvesting a tree, the pressure exerted on the tree by a grapple assembly is at a first preselected value during shearing of the tree trunk and positioning the severed tree for further processing. The pressure exerted on the tree by the grapple assembly is thereafter reduced to a second preselected value and the tree is further processed.
    Type: Grant
    Filed: November 17, 1975
    Date of Patent: November 30, 1976
    Assignee: Caterpillar Tractor Co.
    Inventors: John R. Cryder, James A. Thomas
  • Noise suppressing assembly for continuous track of crawler type vehicle
    Patent number: 3994064
    Abstract: A resilient contacting assembly attachable to track shoes of a crawler type vehicle. The contacting element is formed of a plurality of discs for improving the wear life of the contacting element.
    Type: Grant
    Filed: October 14, 1975
    Date of Patent: November 30, 1976
    Assignee: Caterpillar Tractor Co.
    Inventors: Roger L. Boggs, Eugene R. Groff, Paul L. Wright
  • Track carrying wheels for crawler type vehicles having improved panel assemblies
    Patent number: 3993356
    Abstract: A wheel for carrying continuous track of crawler type vehicles has a set of spaced pairs of inner and outer panel members that are connected together through vibration barriers. One of the inner or outer panels is formed of a laminate.
    Type: Grant
    Filed: October 14, 1975
    Date of Patent: November 23, 1976
    Assignee: Caterpillar Tractor Co.
    Inventors: Eugene R. Groff, Paul L. Wright
  • Fluid system of a work vehicle having fluid combining means and signal combining means
    Patent number: 3991571
    Abstract: A fluid system of 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 fluid control means is provided for controllably passing fluid between the first and second fluid circuits in response to control signals passing between said circuits.
    Type: Grant
    Filed: March 15, 1976
    Date of Patent: November 16, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Howard L. Johnson
  • Load responsive pump controls of a fluid system
    Patent number: 3990236
    Abstract: Apparatus of a fluid system of a work vehicle for controlling the fluid delivered to work elements of the vehicle in response to the load exerted on the fluid system by the work elements.
    Type: Grant
    Filed: February 23, 1976
    Date of Patent: November 9, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Howard L. Johnson
  • Wheel of track assembly of a crawler type vehicle
    Patent number: 3989314
    Abstract: A wheel of a track assembly of a crawler type vehicle has a resilient contacting element fixed about the wheel rim by first and second anchors. The anchors are slidably movable along angular end portions of a rim opening for securing the contacting element to the rim.
    Type: Grant
    Filed: November 24, 1975
    Date of Patent: November 2, 1976
    Assignee: Caterpillar Tractor Co.
    Inventors: Harold L. Reinsma, Robert D. McFeeters, Terry D. Linne