Patents by Inventor James A. Daggerhart

James A. Daggerhart 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: 4255635
    Abstract: A keyswitch includes a tubular plunger with a rectangular body slidably mounted in a rectangular housing that has a bottom wall provided in its top with a circular recess receiving the lower end of a coil spring extending up around a pair of upright spring contact strips, the lower ends of which are press fitted in the bottom wall. The inside of the plunger is provided with a cross member that normally separates the upper ends of the contact strips, but permits them to engage each other when a keycap on the upper end of the plunger is pushed down to lower the plunger. The plunger body has legs extending downwardly from its lower corners which engage the area of the housing between the plunger body and bottom wall of the housing while the plunger is in its upper position. The corners of the bottom walls are provided with downwardly extending sockets for receiving the plunger legs when the keycap is depressed.
    Type: Grant
    Filed: September 17, 1979
    Date of Patent: March 10, 1981
    Assignee: Stackpole Components Company
    Inventors: Dudley H. Campbell, James A. Daggerhart, Arthur W. Overton