Crane Electronics, Inc.

Ben William Tyers

Peter William Everitt

Andrew Chapman

John Edward Burton

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 ().

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Cambridge, United Kingdom

Ben William Tyers