Patents by Inventor Francis Edwin Allen

Francis Edwin Allen 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).

  • Band mill strain mechanism
    Patent number: 3946634
    Abstract: Strain mechanism for bandmill using deadweight lever mechanism in which undesirable effects of inertia of counterweight and friction at knife edges are reduced. Rolling diaphragm air cylinder is used in one of three positions. In first position cylinder extends between arbor carrier arm and plunger tube and supplies portion of saw strain permitting lighter counterweight. In second position it extends between counterweight arm and plunger tube and eliminates counterweights. In third position counterweight is supported on counterweight arm by yoke supported by cylinder which resiliently mounts weight.
    Type: Grant
    Filed: December 7, 1973
    Date of Patent: March 30, 1976
    Assignee: Letson and Burpee Ltd.
    Inventors: Francis Edwin Allen, James Daniel McGuire