Patents Assigned to David C. Kennard, Jr.
  • Pickup truck derrick with traveling sheaves
    Patent number: 5016768
    Abstract: A portable derrick assembly adapted for mounting on a pickup truck or a trailer, includes a base frame, a derrick tower, a tower erection subassembly, and an elongated boom pivotally mounted on the tower. A traveling sheave and cable subassembly interconnects a tail end of the boom with the tower for pivoting the boom about a pitch axis. A hoist cable is raised and lowered by a hoist traveling sheave subassembly mounted on the boom.
    Type: Grant
    Filed: November 2, 1989
    Date of Patent: May 21, 1991
    Assignees: David C. Kennard, Jr., James C. Kennard
    Inventors: Dwight C. Kennard, Jr., James C. Kennard, Carl J. Wick