US 12,246,418 B2
Load measurement system for hydraulic torque wrench
Robin Shaw, Whitley Bay (GB); and Andrew Dumelow, North Shields (GB)
Assigned to ENERPAC TOOL GROUP CORP., Menomonee Falls, WI (US)
Appl. No. 18/026,367
Filed by ENERPAC TOOL GROUP CORP., Menomonee Falls, WI (US)
PCT Filed Oct. 15, 2021, PCT No. PCT/US2021/055262
§ 371(c)(1), (2) Date Mar. 15, 2023,
PCT Pub. No. WO2022/082031, PCT Pub. Date Apr. 21, 2022.
Claims priority of provisional application 63/092,065, filed on Oct. 15, 2020.
Prior Publication US 2024/0058928 A1, Feb. 22, 2024
Int. Cl. B25B 23/145 (2006.01)
CPC B25B 23/1453 (2013.01) 28 Claims
OG exemplary drawing
 
1. A hydraulic torque wrench operable to exert a torque on a workpiece, the wrench comprising:
a housing;
a drive element for engaging the workpiece;
a drive actuator for transmitting a torque to the drive element; and
a gauge coupled to at least one of the housing and the drive actuator, the gauge being configured to detect a characteristic indicative of a torque exerted by the drive element to the workpiece, wherein the drive actuator includes a lever arm for rotating the drive element, and wherein the gauge includes a strain gauge coupled to the lever arm and configured to measure a bending strain of the lever arm.