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:
Feb. 21, 1978
Filed:
Mar. 04, 1976
Applicant:
Inventor:
Gregg N Jonsson, Batavia, IL (US);
Assignee:
Thor Power Tool Company, Aurora, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23Q / ;
U.S. Cl.
CPC ...
173 12 ; 73 8 / ; 73139 ;
Abstract
The control circuit receives a signal from a torque measuring device provided on the tool and determines the proper shut off point for the tool. The circuit controls not only the tool shut off but also the rate of application of torque by employing a pulsing circuit. The circuit is capable of detecting the onset of yield and can accurately and repeatedly set a fastener at a desired point in the plastic region. The onset of yield is detected by differentiating torque with respect to time.