Patents by Inventor John C. Derler

John C. Derler 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: 4892022
    Abstract: A saw blade guard for a sawing power tool, particularly a mitre saw, comprises a protective element having two side walls each formed as a part of a circle, and a peripheral wall connecting the side walls with one another, the side walls having a center and an edge spaced from the center, the protective element being formed as an integral element and provided with a member in the region of the edge for turning the protective element as a whole.
    Type: Grant
    Filed: September 20, 1988
    Date of Patent: January 9, 1990
    Assignee: Robert Bosch Power Tool Corporation
    Inventors: Lawrence M. Cotton, John C. Derler
  • Patent number: 4827996
    Abstract: A power tool for trimming laminate having a motor, a motor housing, interchangeable bases, and a clamping ring. The motor housing has a lower portion having a smaller diameter than that of the rest of the housing. The clamping ring extends from and over the base and clamps around the lower portion of the motor housing. The interchangeable bases are formed as a trim router, laminate trimmer, offset trimmer, and tilt base trimmer, all of which clamp onto the lower portion of the motor housing so that the same motor can be used with any of the bases. The motor housing is also rotatable relative to the base into any one of a plurality of relative angular positions without affecting depth of cut of a bit.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: May 9, 1989
    Assignee: Robert Bosch Power Tool Corporation
    Inventors: Lawrence M. Cotton, John C. Derler, Gary R. Compton