The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 24, 1987
Filed:
Jun. 11, 1986
Burrell T Burney, DeWitt, NE (US);
Abstract
A locking hole punch for punching holes in metal sheets, particularly metal sheets difficult of access such as metal C-studs, is disclosed. This hole punch comprises an arm member that has a head at the end of an outwardly curved portion and a first handle extending from that curved portion. A first lever member formed in a generally mating outwardly curved configuration is pivotably connected to the arm at the top of the arm handle at a first pivot. A generally straight second lever, which acts as a second handle spaced from the arm handle, is pivotably connected to the first lever member at a second pivot near the first pivot. A toggle member is connected to the second lever at a third pivot and to the arm handle at a fourth pivot. When the arm and second handles are pressed together, the toggle member is driven so that the second, third, and fourth pivots are moved into a straightline alignment so that the punch, which includes a punching pin, is driven into a working position with the head. The toggle member can be further driven into a locked mode, which is releasable by operation of a toggle release device. The punching pin can be adjusted to various lengths from the face of the punch by a pin adjusting mechanism. The hole punch is biased from the working position to an open position.