Precision torque screwdriver

US10357871B2 · kind B2 · utility

Assignee

• Milwaukee Electric Tool Corporation · US

Inventors

• Troy C. Thorson · Cedarburg, US
• Matthew J. Mergener · Mequon, US
• John S. Dey, IV · New York, US
• Toby Lichtensteiger · West Bend, US
• Jacob P. Schneider · Madison, US
• Trent Sheffield · Jordan, US

Key dates

• Filing date: Apr 26, 2016
• Grant date: Jul 23, 2019
• Expiry date: Mar 14, 2037

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25B23/141
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A transducer assembly for use in a power tool includes a bracket affixed to a housing of the power tool and a protrusion having an arcuate outer periphery. The protrusion is offset from a central axis of the bracket and extends from the bracket in a direction parallel with the central axis. The transducer assembly also includes a transducer having an inner hub with an aperture through which a distal end of the protrusion is received. The arcuate outer periphery of the protrusion is in substantially line contact with a wall segment at least partially defining the aperture. The transducer also includes an outer rim affixed to a ring gear of the power tool, a flexible web interconnecting the inner hub to the rim, and a sensor affixed to the flexible web for detecting strain of the flexible web in response to a reaction torque applied to the ring gear.