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:
Jul. 13, 1976
Filed:
Apr. 02, 1974
Robert Bossler, Jr, Bloomfield, CT (US);
Kaman Aerospace Corporation, Bloomfield, CT (US);
Abstract
A method and apparatus for testing stress on a bolt head or nut having a central portion which deflects along the bolt axis as a function of stress, in which three electrical contacts, for example screws, are mounted in a line on and extending outwardly from a housing member, the two outer contacts being positioned to electrically connect to peripheral portions of a bolt head or nut when the center contact electrically connects to the deflected central portion and the head or nut has the desired pre-load. The outer contacts are connected to one polarity terminal of a battery via respective indicator bulbs while the center contact connects directly to the other polarity terminal so that both bulbs are lit when the contacts are so applied and the peripheral and central portions are in a given relation, preferably a single plane.