Patents Examined by 30en M. Ostrager
  • Control of a double-action pneumatic drive
    Patent number: 4819541
    Abstract: The drive is controlled such that reduced pressure is applied during a forward motion phase and venting flow from the drive is used as dynamic control pressure to hold off application of full driving pressure until, through physical impediment, piston movement stops. This way rebounding is prevented and strong holding pressure (e.g. on welding electrodes) is made available after a low power motion phase.
    Type: Grant
    Filed: March 7, 1986
    Date of Patent: April 11, 1989
    Assignees: Lothar Schmitt GmbH, Hans E. Winkelmann GmbH
    Inventors: Franz F. Pitsch, Hans E. Winkelmann, Helmut W. Frohnheiser, Guenther Herbert