Patents by Inventor Charles R. Spence

Charles R. Spence 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).

  • Method for extending a boom assembly
    Patent number: 4222492
    Abstract: The overall length of boom assembly can be increased by the use of a pair of boom extension sections. When the boom extension sections are not required, they are supported at storage locations adjacent to one side of a main boom assembly. When the overall length of the main boom assembly is to be increased, a first one of the boom extension sections is pivotally connected with the outer end portion of the main boom assembly and the second boom extension section is pivotally connected with the outer end portion of the first boom extension section. The two boom extension sections are swung outwardly together around the outer end of the main boom assembly. After the first boom extension section has been firmly connected with the outer end portion of the main boom assembly, the second boom extension section is pivoted about the outer end portion of the first boom extension section.
    Type: Grant
    Filed: January 5, 1978
    Date of Patent: September 16, 1980
    Assignee: Burro-Badger Corporation
    Inventors: James G. Wuerflein, Charles R. Spence
  • Apparatus for extending a boom assembly
    Patent number: 4091936
    Abstract: The overall length of boom assembly can be increased by the use of a pair of boom extension sections. When the boom extension sections are not required, they are supported at storage locations adjacent to one side of a main boom assembly. When the overall length of the main boom assembly is to be increased, a first one of the boom extension sections is pivotally connected with the outer end portion of the main boom assembly and the second boom extension section is pivotally connected with the outer end portion of the first boom extension section. The two boom extension sections are swung outwardly together. After the first boom extension section has been firmly connected with the outer end portion of the main boom assembly, the second boom extension section is pivoted about the outer end portion of the first boom extension section.
    Type: Grant
    Filed: November 15, 1976
    Date of Patent: May 30, 1978
    Assignee: The Warner & Swasey Company
    Inventors: James G. Wuerflein, Charles R. Spence