Patents Assigned to Vollrath Refrigeration, Inc.
  • Spring hinge
    Patent number: 3975794
    Abstract: A cam rise hinge has a swingable strap portion which is cammed up relative to a stationary butt portion when a door on which the strap portion is mounted is swung towards its open position. A coiled wire torsion-compression spring is positioned and mounted so as to be compressed and simultaneously twisted when the strap portion is cammed up. This generates two different forces aiding each other and gravity in swinging the strap portion and door back toward closed position.
    Type: Grant
    Filed: November 22, 1974
    Date of Patent: August 24, 1976
    Assignee: Vollrath Refrigeration, Inc.
    Inventors: Kenneth L. Kaiser, William Stowik