Patents by Inventor David A. Peter

David A. Peter 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: 4631685
    Abstract: Accurate dimensional control in ultrasonic welding or upsetting of plastic parts is accomplished by the method and apparatus for monitoring the ultrasonic head displacement and sensing when a predetermined trigger force is applied to the part or parts, turning on the ultrasonic energy at the trigger point and terminating the ultrasonic energy when head displacement from the trigger point reaches an empirically established value, holding the force for a hold time and measuring the maximum displacement value at the end of the hold time, releasing the force when the force returns to the trigger point, measuring the overall displacement, and determining whether the overall displacement is within allowable tolerance values. Weld time and weld energy as well as the overall head displacement are monitored for comparison with preset tolerance values to determine acceptability of the part being processed.
    Type: Grant
    Filed: December 7, 1984
    Date of Patent: December 23, 1986
    Assignee: General Motors Corporation
    Inventor: David A. Peter
  • Patent number: 3999886
    Abstract: Improved stability is provided in a hingeless helicopter rotor by inclining the principal elastic flexural axes and coupling pitching of the rotor blade with the lead-lag bending of the blade. The primary elastic flex axes can be inclined by constructing the blade of materials that display non-uniform stiffness and the specification describes various cross section distributions and the inclined flex axes resulting therefrom. Also described are arrangements for varying the pitch of the rotor blade in a predetermined relationship with lead-lag bending of the blade, i.e., bending of the blade in a plane parallel to its plane of rotation.
    Type: Grant
    Filed: October 10, 1974
    Date of Patent: December 28, 1976
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Robert A. Ormiston, William G. Bousman, Dewey H. Hodges, David A. Peters