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:
Apr. 17, 1979
Filed:
Dec. 01, 1977
Emerson D Spengler, Lebanon, PA (US);
Charles W Schaeffer, Lebanon, PA (US);
Bethlehem Steel Corporation, Bethlehem, PA (US);
Abstract
A load indicator washer in the form of a parallelogram includes flat bearing surfaces on one of its faces, the bearing surfaces extend inwardly from two opposite ends of the washer, a slightly arcuate portion extends between and connects the bearing surfaces, a hole to receive a fastener extends through the washer at about the midpoint of the washer, and a conical portion symmetrically positioned about the hole, terminating short of the ends of the washer, and extending outwardly from the arcuate portion. The arcuate portion and the conical portion act as springs, deflect under a load, and thereby indicate such load. The load indicator washer is particularly adapted for use with a mine roof bolt.