Patents by Inventor John S. Krejmas

John S. Krejmas 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).

  • Machine safety guard
    Patent number: 4357839
    Abstract: Operator access to the zone at which workpieces are struck in a drop hammer is temporarily but reliably blocked by a sturdy mechanical guard throughout every period when the hammer may commence and complete its fall; a unique physical linkage, between the guard and a safety-dog lever which must be manually turned in order to release the hammer, insures that the safety guard must have been shifted from an out-of-the-way position into a protective orientation before the hammer can drop.
    Type: Grant
    Filed: June 26, 1980
    Date of Patent: November 9, 1982
    Assignee: Rogers, Lunt & Bowlen Company
    Inventor: John S. Krejmas