Patents by Inventor Peter D. Arnall

Peter D. Arnall 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).

  • Rock bolting
    Patent number: 5352065
    Abstract: A drive nut (3,7) for a rock bolt, incorporating a nut (7) with a crimped protrusion (9), and an insert (3). The protrusion is crimped to form a plurality of lips (8) adapted to retain insert (3) in the head of the nut (7), the crimping being effected by a pressing tool having a number of preferably square bars. By this crimping technique, the drive nut (3,7) can be fabricated in such a way that the breaking torque required to expel the insert (3) from the nut (7) can be limited to a predetermined range.
    Type: Grant
    Filed: April 21, 1992
    Date of Patent: October 4, 1994
    Assignee: The Ani Corporation Ltd.
    Inventors: Peter D. Arnall, Rataj Mieczyslaw