Patents by Inventor Daniel F. Hefler

Daniel F. Hefler 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).

  • Hydraulically operated riveting machine
    Patent number: 3955739
    Abstract: A hydraulically actuated power cylinder reciprocates a driver to exert a compressive force to upset a rivet with the power cylinder's movement being made to correspond to the movement of a pump cylinder by a fluid connection therebetween. The pump cylinder's movements are mechanically actuated according to a programmed cam and actuation is made to occur only during the riveting cycle by a control circuit operating a clutch and brake with the circuit inhibiting operation upon the sensing of a malfunction.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: May 11, 1976
    Assignee: The Milford Rivet & Machine Company
    Inventors: Richard L. Markus, William P. Hidden, Daniel F. Hefler