Utilizing Fluid Amplifier Patents (Class 83/639.2)
  • Patent number: 6418824
    Abstract: A press for forming a workpiece with a tooling set includes an actuator assembly carrying a movable half or punch of the tooling set and having a two phase operation. In the first phase the actuator provides relatively low force in moving the punch to an intermediate position in close proximity to the workpiece. A sensor detects the position of the punch, and when the punch reaches the intermediate position provides a continue signal. The second phase of actuator operation is conditioned on occurrence of the continue signal, and uses normal high force to press the movable tooling half against the workpiece to complete the operation. The low force first phase allows obstructions of any kind to stop movement of the punch during the first phase before high force applied to the actuator may cause damage or injury to the obstruction. In a preferred embodiment the actuator assembly has hydraulic operation.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: July 16, 2002
    Assignee: PCPS Limited Partnership
    Inventors: Terrence P. Duggins, Robert L. Hughes, Edward L. Schwarz