Patents by Inventor Harold D. McDonald

Harold D. McDonald 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: 4182928
    Abstract: A heating element terminal comprising a tubular conductor extending through the central bore of a two-piece insulating clamp member and an aligned aperture of the heating element frame clamped therebetween. The tubular conductor includes a flattened terminal plate at a first end projecting outwardly of the heating element and at the second opposite end includes a compression sleeve portion extending axially therefrom and projecting inwardly of the heating element. An end of the resistance wire of the heating coil is inserted into the central bore of the inwardly projecting compression sleeve portion which is crimped to secure the end of the resistance wire to the said second end of the terminal. The flattened plate formed at the first end of the terminal is drawn into abutment against the two-piece clamp member, and the second opposite end is similarly flattened at the point immediately adjacent the opposite side of the clamp member.
    Type: Grant
    Filed: March 15, 1978
    Date of Patent: January 8, 1980
    Assignee: Square D Company
    Inventors: James E. Murphy, Felix M. Atwood, Harold D. McDonald