Patents by Inventor Duncan Hart

Duncan Hart 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: 6691797
    Abstract: A device for use in combination with a pile driving apparatus for driving piles into the ground. The device (1) including a main body (13) which carries side grippers (18) and (19) each of which comprises a ram consisting of a piston and cylinder (20). A further gripper (23) is included, which extends downwardly of the main body (13) which grips the lower end of a pile, while grippers (18) and (19) are used to pick up and position a pile. A vibratory force generator (16) is operated to cause the main body (13) to vibrate thereby applying a downward vibrating force to the main body (13) and the pile held by the grippers (18, 19, 23), so driving the pile into the ground.
    Type: Grant
    Filed: December 13, 2001
    Date of Patent: February 17, 2004
    Inventor: Duncan Hart