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:
Apr. 16, 2013
Filed:
Apr. 11, 2008
Peter William Everitt, Leicestershire, GB;
Ben William Tyers, Cambridge, GB;
Andrew Chapman, Peterborough, GB;
John Edward Burton, Birmingham, GB;
Peter William Everitt, Leicestershire, GB;
Ben William Tyers, Cambridge, GB;
Andrew Chapman, Peterborough, GB;
John Edward Burton, Birmingham, GB;
Abstract
A variable torque-rate test point for the performance testing of rotary tools for threaded fasteners comprises a screw-threaded bolt () having a moment of inertia comparable to that of a bolt to be tightened using the rotary tool. The bolt () is tightened in the test joint against a torque-rate adjustment device () which can be adjusted to simulate a hard or a soft joint. The adjustment device () comprises a washer portion () beneath the bolt head (), at least one spring beam () extending from a reaction point () radially outwardly of the bolt (), and a pivotal bearing member () or other pivot at a mid portion of the beam (). The beam () flexes as it extends in cantilever over the pivot point, and that flexure can be adjusted to vary the torque-rate of the test joint by varying the distance between the pivot point and the rotary axis of the bolt ().