Patents by Inventor Hellmuth Fehrs

Hellmuth Fehrs 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).

  • Patent number: 4749115
    Abstract: A magazine for a power-driven drive-in apparatus for the accommodation of pins or nails, especially headless nails or pins, comprising a guiding channel the roof wall of which is adapted to assume different heights vis-a-vis the bottom wall for adaptation to the lengths of the pins or nails. A side wall of the guiding channel is formed by at least one longitudinal surface of a lamination which is supported in the upper region of the guiding channel to be capable of limited movement along an axis transverse to the longitudinal axis of the guiding channel and is biased by a spring in a direction towards the other side wall.
    Type: Grant
    Filed: December 11, 1986
    Date of Patent: June 7, 1988
    Assignee: Joh. Friedrich Behrens AG
    Inventor: Hellmuth Fehrs
  • Patent number: 4351464
    Abstract: The invention relates to a compressed air-operated fastener driving tool comprising a pilot valve controlled by a manually actuated release lever, a control valve, the pressure bias of which is controlled by the pilot valve and which for its part controls the supply of compressed air to a working cylinder, and a release barrier adapted to be actuated by the workpiece by means of which the actuation of the pilot valve is adapted to be controlled in common with the release lever when placed in its working position.
    Type: Grant
    Filed: June 3, 1980
    Date of Patent: September 28, 1982
    Assignee: Joh.Friedrich Behrens AG
    Inventors: Hellmuth Fehrs, Wolfgang Elliesen
  • Patent number: 3957192
    Abstract: A fastener-driving tool has a magazine from which the fasteners are fed to a discharge chute. The wall of the discharge chute opposite to the outlet of the magazine is movable between two positions in one of which it allows fasteners to be removed from the discharge chute. Movement of the wall, which is formed in two separable portions, is effected in a plane at right angles to the direction in which the fasteners are fed within the magazine.
    Type: Grant
    Filed: September 26, 1974
    Date of Patent: May 18, 1976
    Assignee: Joh. Friedrich Behrens Metallwaren-Fabrik
    Inventor: Hellmuth Fehrs
  • Patent number: 3946927
    Abstract: A magazine for fastener-driving apparatus includes a guide on which the fasteners are located, a slide movable along the guide under the action of a spring to feed the fasteners into a driving position and a cover which fits over the guide. The cover is displaceable in a direction transverse to the feed direction into a release position to permit the introduction of fasteners into the magazine.
    Type: Grant
    Filed: June 20, 1974
    Date of Patent: March 30, 1976
    Assignee: Joh. Friedrich Behrens
    Inventor: Hellmuth Fehrs
  • Patent number: D282345
    Type: Grant
    Filed: July 29, 1983
    Date of Patent: January 28, 1986
    Inventor: Hellmuth Fehrs