Patents by Inventor James D. Crabtree

James D. Crabtree 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: 4484765
    Abstract: A suspension system for wheeled vehicles, particularly adapted to extended travel suspension systems for armored wheeled vehicles in which each of the front and rear vehicle wheel assemblies is mounted on a trailing arm suspension. The front suspension system includes an axle housing supported at either outboard end by a bell crank assembly, each including a trailing arm pivotally mounted to the axle housing at one end and at the other to a pivotal support on the vehicle hull or frame with a second shorter crank arm acting on a coil spring to resist arm motion by compression of the spring. Within each coil spring is disposed a stack of rubber bumper elements compressed with the spring while a pair of rubber bushings is provided at each pivot point of each of the trailing arms, the damping action of the stack bumpers and bushings performing a shock absorbing function. The rubber bushings also act as torsional springs and to accommodate limited tilting motion of the axle housing.
    Type: Grant
    Filed: December 28, 1981
    Date of Patent: November 27, 1984
    Assignee: Cadillac Gage Company
    Inventors: Irving Appelblatt, Theodore A. Jackson, James D. Crabtree
  • Patent number: 4159669
    Abstract: A hatch for an armored vehicle having a viewing block integral therewith to be moved with the hatch as the hatch is opened and closed. The hatch is mounted for guided movement on a downwardly sloping surface of the armored vehicle so as to move down and away from the hatch opening to allow viewing from the hatch opening downwardly over the opened hatch. The open and closing guides include a three-point roller guide rail support configured to allow the weight of the hatch to be carried by the rollers after an initial upward movement of the hatch from compressive engagement with a peripheral seal installed about vehicle openings and thence slid downwardly on the guide rails away from the opening.
    Type: Grant
    Filed: October 14, 1977
    Date of Patent: July 3, 1979
    Assignee: Cadillac Gage Company
    Inventors: Theodore A. Jackson, James D. Crabtree
  • Patent number: 4158986
    Abstract: An armored wheeled vehicle configured for maximum resistance to penetration by frontally directed weapons fire while affording excellent visibility at the driver station and an extended field of fire for the weapon observation station, having an armored hull with an extended upper oblique frontal surface, sloping to a point rearward of the midpoint of the vehicle. The driver station is located approximately at the midpoint of the vehicle with the sloping frontal surface affording good visibility for the driver and includes a driver's hatch positioned over a driver station hull opening, the hatch adapted to be moved down and forwardly to provide an unobstructed driver view. The armament observation station is located to the rear and above the driver station, while the vehicle power plant is located along side the driver station. The front suspension includes a trailing arm type suspension minimizing the hull depth at the front wheels to allow the oblique frontal surface to be extended.
    Type: Grant
    Filed: October 14, 1977
    Date of Patent: June 26, 1979
    Assignee: Cadillac Gage Company
    Inventors: Irving Appelblatt, Theodore A. Jackson, James D. Crabtree, Peter Krawiecki