Patents by Inventor Dwight C. Kennard, Jr.

Dwight C. Kennard, Jr. 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).

  • 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
  • Portable and collapsible derrick structure
    Patent number: 4651884
    Abstract: A pickup truck derrick assembly includes a base frame, a derrick A-frame pivotally mounted on the base frame, a derrick frame erection subassembly, a frame support and locking subassembly and a cable compensation system. In one form, the frame erection subassembly includes an elongated track. A roller or carriage subassembly rides on the track and engages the A-frame. Movement of the carriage along the track raises and lowers the A-frame. The A-frame is held in an erected position by support braces pivotally connected at one end to the base frame. Each brace slidably engages a sleeve mounted on the A-frame. A locking mechanism automatically secures the braces to the sleeves when the A-frame is erected. In another form, the erection subassembly includes lead screw actuators combined with the support braces to raise and lower the A-frame and lock the frame in position.
    Type: Grant
    Filed: April 15, 1985
    Date of Patent: March 24, 1987
    Inventors: Dwight C. Kennard, Jr., James C. Kennard
  • Portable and collapsible derrick structure
    Patent number: 4615450
    Abstract: A pickup truck derrick assembly includes a base frame, a derrick A-frame pivotally mounted on the base frame, a derrick frame erection subassembly, a frame support and locking subassembly and a cable compensation system. The frame erection subassembly includes an elongated track. A roller or carriage subassembly rides on the track and engages the A-frame. Movement of the carriage along the track raises and lowers the A-frame. The A-frame is held in an erected position by support braces pivotally connected at one end to the base frame. Each brace slidably engages a sleeve mounted on the A-frame. A locking mechanism automatically secures the braces to the sleeves when the A-frame is erected. A pulley and cable arrangement including a compensation pulley on a support arm fixed to the A-frame compensates for hoist cable slackening when the A-frame is pivoted to its storage position.
    Type: Grant
    Filed: June 15, 1984
    Date of Patent: October 7, 1986
    Inventors: Dwight C. Kennard, Jr., James C. Kennard