Patents by Inventor Dieter W. Stein

Dieter W. Stein has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Power tool, in particular a hand-held compressed air screwdriver
    Patent number: 4467877
    Abstract: A pneumatic screwdriver or nutsetter includes a manually actuated electrical switch and a solenoid operated motive air shutoff valve which includes a spring biased reset element for moving the shutoff valve closure element from a valve closed position to a valve open position prior to introduction of compressed air to the tool motor. The reset element is retracted away from the closure element by pressurized air upon startup of a tool operating cycle. The closure element is released upon deenergization of the solenoid at a predetermined signal to close the shutoff valve. In an alternate embodiment the switch is replaced by a pneumatic valve and the reset element is pressure air biased to move the shutoff element from the shutoff valve closed position to the open position.
    Type: Grant
    Filed: January 28, 1982
    Date of Patent: August 28, 1984
    Assignee: Deutsche Gardner-Denver GmbH
    Inventors: Jurgen K. D. Koltermann, Dieter W. Stein, Eugen Mattheiss, Bernhard J. Polzer
  • Power tool, in particular a hand-held compressed air screw driver
    Patent number: 4320806
    Abstract: A pneumatic screwdriver or nutsetter includes a manually actuated electrical switch and a solenoid operated motive air shutoff valve which includes a spring biased reset element for moving the shutoff valve closure element from a valve closed position to a valve open position prior to introduction of compressed air to the tool motor. The reset element is retracted away from the closure element by pressure air on startup of a tool operating cycle. The closure element is released upon deenergization of the solenoid at a predetermined signal to close the shutoff valve. In an alternate embodiment the switch is replaced by a pneumatic valve and the reset element is pressure air biased to move the shutoff element from the shutoff valve closed position to the open position.
    Type: Grant
    Filed: April 20, 1979
    Date of Patent: March 23, 1982
    Assignee: Deutsche Gardner-Denver G.m.b.H.
    Inventors: Jurgen K. D. Koltermann, Dieter W. Stein, Eugen Mattheiss, Bernhard J. Polzer