Patents by Inventor David M. Scruggs

David M. Scruggs 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: 4204142
    Abstract: An improved hoist control system wherein a D.C. motor is employed to drive the hoist, and a remote hand-held control is utilized to vary the motor speed and direction of rotation. The hand control comprises an A.C. to D.C. variable transformer which is controllable by a trigger mechanism, a three-pole double throw switch for up-off-down control of the motor, circuit on-off switches, a meter for reading the hoist load, and an interlock device for limiting the actuation of the motor control switch if the trigger is depressed.
    Type: Grant
    Filed: December 27, 1977
    Date of Patent: May 20, 1980
    Inventor: David M. Scruggs