Patents Assigned to National Set Screw
  • Method of making a sucker rod assembly
    Patent number: 4538339
    Abstract: A sucker rod assembly is disclosed for use in oil well pumping apparatus. The assembly comprises a rod with roll-formed threads on the end thereof and a rod-end fitting with a threaded socket for receiving the threaded rod. An unthreaded portion on the outer end of the socket is extruded into surface engagement with the unthreaded surface of the rod to seal and mechanically interlock the rod and fitting.
    Type: Grant
    Filed: July 22, 1983
    Date of Patent: September 3, 1985
    Assignee: National Set Screw
    Inventor: Peter D. Ewing
  • Tool holder for a mining tool bit and method for making same
    Patent number: 4485655
    Abstract: A tool holder for a mining tool bit is disclosed; it comprises a unitary steel body with a cylindrical shank for supporting the tool holder and a conical head for holding a tool bit. The shank includes a retaining neck constructed of a roll-formed portion of the shank. A cylindrical section between the shank and the head includes an extracting neck which is constructed of a roll-formed portion of the section.
    Type: Grant
    Filed: October 29, 1980
    Date of Patent: December 4, 1984
    Assignee: National Set Screw Corporation
    Inventor: Peter D. Ewing