Patents by Inventor Arthur Wild

Arthur Wild 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: 5177419
    Abstract: An apparatus for controlling a load lifting implement of a work vehicle in response to the condition of a motor brush is provided. The vehicle has a frame and the load lifting implement is connected to the frame and elevationally moveable relative to the frame between first and second directions. A brush wear indicator senses the wear of the motor brush and produces a warning signal in response to a predetermined amount of wear of the motor brush. A control system receives the warning signal and responsively controllably inhibits the elevational movement of the load lifting implement in at least one of the first and second directions.
    Type: Grant
    Filed: March 27, 1991
    Date of Patent: January 5, 1993
    Assignee: Caterpillar Industrial Inc.
    Inventors: William Pickering, Bruce A. Nielsen, Arthur Wild
  • Patent number: 5142435
    Abstract: An apparatus is provided for precharging a filter capacitor to prevent damage to a set of contacts resulting from arcing across the contacts. Included is a coil, a set of contacts, and a battery, such that the contacts and filter capacitor are connected in series and the series connected combination is connected in parallel across the battery. Also included is a switch, and a microprocessor for producing a triggering signal responsive to the closure of the switch. A driving circuit receives the triggering signal and responsively produces a charging signal. A charging circuit receives the charging signal and responsively charges the filter capacitor. Thereafter, the microprocessor produces an energizing signal causing the coil to become energized and the contacts to responsively close. By precharging the filter capacitor before the closure of the contacts, the voltage potential across the contacts is reduced. Therefore, no damage occurs due to arcing across the contacts.
    Type: Grant
    Filed: June 4, 1990
    Date of Patent: August 25, 1992
    Assignee: Caterpillar Industrial Inc.
    Inventors: Kenneth A. Baumgartner, William Pickering, Arthur Wild
  • Patent number: 5055961
    Abstract: An apparatus for dampening current in a coil has a switchable member which controls the current level in the coil and a flyback circuit that allows current in the coil to slowly dissipate when the switchable member changes from an "ON" to an "OFF" state. The flyback circuit has a high resistance when the switchable member changes from the "ON" to the "OFF" state so that the coil current is dampened as quickly as possible without creating a destructive voltage and low resistance when the switchable member is in the "ON" state to conserve energy. A signaling device creates a voltage signal as a function of current passing through the flyback circuit and a receiving device varies the resistance of the flyback circuit in response to the voltage signal. The apparatus is particularly suited for use in a motor control circuit.
    Type: Grant
    Filed: November 6, 1989
    Date of Patent: October 8, 1991
    Assignee: Caterpillar Industrial Inc.
    Inventors: Wayne T. Wiblin, Arthur Wild
  • Patent number: 4171532
    Abstract: A thyristor pulse control circuit has a main thyristor, a commutation circuit including a commutating capacitor, and a bypass contactor connected across the main thyristor, and is provided with apparatus for applying a gating signal to the main thyristor immediately before the contacts of the bypass contactor close and also immediately before the contacts of the bypass contactor close to prevent arcing at the contacts. The application of the gating signal is inhibited if a comparison of the voltage across the commutating capacitor with the load current flowing immediately before the bypass contactor closes indicates that the load current is too great to be safely commutated by the commutating capacitor at the measured voltage.
    Type: Grant
    Filed: May 24, 1978
    Date of Patent: October 16, 1979
    Assignee: Caterpillar Tractor Co.
    Inventors: Albert E. Sloan, Arthur Wild
  • Patent number: 4110668
    Abstract: A pulse controller for controlling the current supply to a plurality of d.c. loads through a respective main thyristor for each load is provided with digital circuitry operable to maintain the mark-space ratios of voltage applied to the loads in a relationship to one another which is set by a differential control circuit while the mark-space ratios are simultaneously varied in response to a drive control circuit. The controller may be used to control two d.c. motors respectively driving right-hand and left-hand traction wheels of a battery-electric vehicle, to provide differential drive when the vehicle negotiates a curve.
    Type: Grant
    Filed: January 24, 1977
    Date of Patent: August 29, 1978
    Assignee: Sevcon Limited
    Inventors: David Gurwicz, Albert E. Sloan, Barry Moss, Arthur Wild, William R. Ord