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:
Dec. 20, 1988
Filed:
Nov. 12, 1986
John H Bickford, Middletown, CT (US);
Jesse R Meisterling, East Hampton, CT (US);
Milton O Smith, Bothell, WA (US);
Geoffrey F Kosciak, Stevensville, MI (US);
Raymond Engineering Inc., Middletown, CT (US);
Abstract
Apparatus and a method are presented for determining the torque load applied to a fastening element by a fluid powered wrench, and displaying a digital readout of the torque. The operating pressure of the wrench, after compensation for the temperature of the pressure transducer, is converted to a torque measurement by a programmed microprocessor and the torque value is displayed on a digital readout. The system is useable with and adjusts for wrenches of several sizes by an input selector switch connected to the microprocessor. Apparatus and method are also presented for automatic cycling of a ratcheting hydraulic powered wrench and automatic termination of the tightening process when a predetermined torque has been delivered to the fastening element.