Patents Assigned to Prime Tube, Inc.
  • Hydraulic cylinder for automotive steering systems and the like
    Patent number: 5085131
    Abstract: An automotive steering system hydraulic cylinder and method for making the cylinder are disclosed. The cylinder is attached to a rack and pinion gear assembly housing so that a piston from the assembly creates a variable displacement chamber within the cylinder. The cylinder features a smooth interior surface to provide a sealing surface with the piston and an end that has been closed by spin-forming. The method provides a means of easily fabricating such a cylinder.
    Type: Grant
    Filed: October 2, 1990
    Date of Patent: February 4, 1992
    Assignee: Prime Tube, Inc.
    Inventors: Brian F. Barrett, Frank H. Firek