Patents by Inventor James B. MacBeth

James B. MacBeth 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).

  • Torque limited drawout mechanism for circuit device
    Patent number: 5120913
    Abstract: A circuit breaker drawout arrangement includes a drive mechanism for moving a circuit breaker along a pair of rails between a Connect and a Disconnect position by means of a drive tool. A torque limited clutch permits a lower maximum torque when moving the breaker to the Connect position and a greater maximum torque when moving from the Connect position to the Disconnect position. In one embodiment the clutch is formed by a pair of oppositely orientated unidirectional roller clutches in the drive nut and in another by a ball and detent arrangement in the drive nut.
    Type: Grant
    Filed: February 25, 1991
    Date of Patent: June 9, 1992
    Assignee: Square D Company
    Inventors: Thomas C. Leach, James B. MacBeth