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:
May. 31, 1977
Filed:
Oct. 06, 1975
Walter C Vliet, Landing, NJ (US);
Ingersoll-Rand Company, Woodcliff Lake, NJ (US);
Abstract
A wrenching apparatus for torquing a fastener to its yield point and automatically shutting off once the yield point is reached. The yield point is sensed by having the wrenching apparatus resiliently restrained and creating a pulse signal in response to an increment of restraint. Rotational output of the wrenching apparatus also creates a pulse for each increment of rotation chosen. The rotational pulses are counted and the restraint pulses are utilized to cancel the sum of the rotational pulses. The yield point is detected when the sum of the rotational pulses exceeds a predetermined number without having received a restraint pulse cancellation. The count system is activated only after a predetermined level of total restraint is achieved thereby assuring the fastener is seated and the fastener tension is increasing in its linear range.