Patents by Inventor Robert John Corbett

Robert John Corbett 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).

  • Double action fastener installation tool for blind rivets and the like
    Patent number: 4118969
    Abstract: An improved fluid actuated double action pullgun for installing blind rivets, particularly of the lock spindle type, which includes an improved shift valve mechanism. The shift valve employes a ballseat relief valve associated with pressure responsive plunger mechanism and spring responsive ball guide mechanism which respond to pressure differentials to directly monitor pressure in the trapped oil circuit and restrain "shift piston" motion prior to shift. Premature "shift piston" travel, which is a malfunction, is eliminated.
    Type: Grant
    Filed: July 27, 1977
    Date of Patent: October 10, 1978
    Assignee: Huck Manufacturing Company
    Inventor: Robert John Corbett