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:
Nov. 14, 1978
Filed:
Jul. 06, 1976
Kenneth A Lehoczky, Livonia, MI (US);
Robert B Edwards, South Bend, IN (US);
GSE, Inc., Farmington Hills, MI (US);
Abstract
A battery operated torque wrench having a digital display to give a numerical representation of torque applied to a rotational workpiece, such as a socket head bolt. Applied torque is sensed by variable resistors responsive to mechanical strain in a flexure element in the head of the wrench. The variable resistors are connected in a bridge circuit which yields an electrical analog signal when the bridge is unbalanced due to mechanical strain in the variable resistors. The electrical analog signal is tracked and converted into a digital equivalent by a servo-type feedback circuit. Each iteration of the feedback circuit generates a counting pulse which is registered on a set of binary coded decimal (BCD) counters connected in cascade. The outputs of the BCD counters are displayed on light emitting diode displays on the wrench handle. Overrange, underrange, and low power indicator means and power strobing means are also disclosed.