Patents Assigned to Farr Canada Ltd.
  • Tong for well pipe
    Patent number: 6270136
    Abstract: A back-up tong is provided with one or more linearly-acting hydraulic cylinders which advance a triangular wedge in order to drive a pipe gripping jaw inwardly into engagement with pipe. A thrust-receiving jaw that is not hydraulically actuated can be adjusted in its fixed position. Springs within the actuated jaw bias it to recoil spontaneously from the pipe upon the retraction of the wedge.
    Type: Grant
    Filed: July 13, 1999
    Date of Patent: August 7, 2001
    Assignee: Farr Canada Ltd.
    Inventor: Daniel W. Dagenais