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:
Dec. 28, 1982
Filed:
Mar. 23, 1981
Craig B Williams, Fayetteville, GA (US);
M. A. Industries, Inc., Peachtree City, GA (US);
Abstract
The present device is especially useful for positioning on forms prior to the pouring of concrete for removal therefrom to create holes in the concrete to receive inserts therein such as in making holes in concrete for steps to be used in a manhole. A tapered steel shaft of any selected length has a collar fixed near one end thereof with an elongated handle passing transversely therethrough. The collar has slanted cam edges on each end providing a cam surface which is approximately 12.degree. from a line perpendicular to the axis. A second collar identical to the first is welded to a form, such as a steel concrete form used in pouring concrete for manholes. The second collar also has slanted cam edges providing a cam surface corresponding to the slanted cam edges on the first collar and there is a hole passing through the steel pin and through the second collar to receive a removable latch pin therein. The steel pin is inserted through the second collar and fixed in place until after the concrete is poured and has cured sufficiently at which time the latch pin is disengaged and the handle is turned to rotate a cam edge of the first collar against a cam edge of the second collar thereby providing a cam action which readily disengages the pin from the concrete and leaves a hole.