Patents by Inventor Carl E. Campbell

Carl E. Campbell 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: 5392672
    Abstract: A ratchet wrench imparts rotational movement to a relatively large workpiece such as the stem of a water main valve or a fire hydrant. The wrench includes an annular driver member, a housing having an elongated recess, a pawl element and a bias element. The annular driver member is adapted to detachably engage the workpiece and includes a plurality of driver teeth disposed circumferentially around its outer periphery. The housing receives the annular driver member so that rotational movement can be imparted to it within the housing and the handle structure extends from the housing to provide mechanical advantage for imparting the rotational movement. The elongated recess extends into the housing along a longitudinal access. The elongated recess is positioned with respect to an imaginary line tangent to a selected radius of the annular driver member such that the longitudinal axis is disposed substantially parallel to or coextensive with the selected radius.
    Type: Grant
    Filed: March 9, 1993
    Date of Patent: February 28, 1995
    Assignee: Larry R. Larson
    Inventors: Larry R. Larson, Carl E. Campbell
  • Patent number: D332901
    Type: Grant
    Filed: August 30, 1990
    Date of Patent: February 2, 1993
    Assignee: Christian Brothers, Inc.
    Inventor: Carl E. Campbell