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:
Aug. 20, 2013
Filed:
Nov. 17, 2010
Adrian James Duffin, Warwickshire, GB;
John Edward Burton, Birmingham, GB;
Peter William Everitt, Leicestershire, GB;
Neil Mcdonald, Staffordshire, GB;
Andrew Wilkins, Derby, GB;
Adrian James Duffin, Warwickshire, GB;
John Edward Burton, Birmingham, GB;
Peter William Everitt, Leicestershire, GB;
Neil McDonald, Staffordshire, GB;
Andrew Wilkins, Derby, GB;
Crane Electronics Limited, Hinckley, Leicestershire, GB;
Abstract
In a variable torque rate test joint, screw-threaded first and second elements are rotated relative to one another by a tool under test. At least one spring beam is cantilevered over a pivot point to exert an axial force between the first and second elements and the torque rate of the test joint can be varied by moving the pivot point to change the axial force. The first element may be a shaft that is fixed during testing and the second element is a nut rotatably mounted on the shaft, whereby the element rotated by the tool has a minimal moment of inertia. Whichever of the first and second elements is held stationary during the test may be mounted in a hub that is locked during the test but can be rotated at the end of the test to reset the test joint. Measurements may be made of the torque and the rotation angle to derive an actual torque rate of the joint, which allows correction of errors by moving the pivot point.