Patents Assigned to L & F Industries
  • Jaw assembly for stretch press
    Patent number: 4706486
    Abstract: A jaw assembly for a stretch forming press is disclosed. The jaw assembly comprises a flexible jaw having a plurality of hingedly connected jaw segments mounted to a supporting jaw frame by means of three support pins so arranged as to distribute the loads from the part being formed into the support jaw frame through the three support pins.
    Type: Grant
    Filed: February 3, 1986
    Date of Patent: November 17, 1987
    Assignee: L & F Industries
    Inventor: Kwok-Ning S. Kan
  • Stress sensor for yield-point detection in a stretch press
    Patent number: 4501135
    Abstract: A system for sensing tensile stress in a metal sheet being stretch formed between gripping jaws in a stretch press. Reaction force of the stressed sheet causes elastic deformation of each jaw, and this deformation is detected by movement of a light beam emitted from a source secured to the jaw. A photosensor output signal related to light-beam movement is correlated with a second signal representing sheet strain or elongation to detect when the sheet has been tensioned to the yield point.
    Type: Grant
    Filed: February 9, 1982
    Date of Patent: February 26, 1985
    Assignee: L & F Industries
    Inventors: David E. Chivens, Laramie J. Cloward