Patents by Inventor John Arthur Larkin

John Arthur Larkin 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: 7913400
    Abstract: (FIG. 1) shows an improved bolt cutting tool comprising left and right cutting jaws (10) that are closed by handles (12A and 12B). As handles (12A and 12B) are separated, jaw (10) opens to allow the material to be cut to enter. The cutting handles (12A and 12B) are closed, utilizing a partially threaded rod (14) and rotational handle (16) to draw them closed. (FIG. 2).
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: March 29, 2011
    Inventor: John Arthur Larkin
  • Publication number: 20080163494
    Abstract: (FIG. 1) shows an improved bolt cutting tool comprising left and right cutting jaws (10) that are closed by handles (12A and 12B). As, handles (12A and 12B) are separated, jaw (10) opens to allow the material to be cut to enter. As handles (12A and 12B) are closed, utilizing threaded rod (14) to draw them closed, the cutting edges of jaw (10) close (FIG. 2). This substantially enhanced mechanical advantage allows any user to produce the needed cutting force. It is not limited by the physical strength of the user as with conventional bolt cutters. Another advantage of the embodiment is a bolt cutter that has much shorter handles, is less cumbersome and can be manufactured with a more compact construction. Cutting of relatively large hard work-pieces, such as bolts, locks or reinforcing bars can be done with relative ease. (FIG. 4A and FIG. 4B) show embodiments where threaded rod (14A), be manually closed by operation of a ratchet and in another embodiment, by operation of a rotating handle (FIG. 1).
    Type: Application
    Filed: October 31, 2007
    Publication date: July 10, 2008
    Inventor: John Arthur Larkin