US 12,240,082 B2
Hydraulic torque wrench and control system for a hydraulic torque wrench
Craig Ian Stickley, Blaydon Tyne and Wear (GB)
Assigned to Enerpac UK Ltd, Morpeth (GB)
Appl. No. 17/625,999
Filed by Enerpac UK Ltd, Northumberland (GB)
PCT Filed Jul. 13, 2020, PCT No. PCT/GB2020/051683
§ 371(c)(1), (2) Date Jan. 10, 2022,
PCT Pub. No. WO2021/009500, PCT Pub. Date Jan. 21, 2021.
Claims priority of application No. 1910033 (GB), filed on Jul. 12, 2019.
Prior Publication US 2022/0250214 A1, Aug. 11, 2022
Int. Cl. B25B 21/00 (2006.01); B25B 23/145 (2006.01)
CPC B25B 21/005 (2013.01) [B25B 23/1456 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A combination of a hydraulic torque wrench and a hydraulic power pack, the combination comprising:
the hydraulic torque wrench having
a ratchet link including a socket for engaging with a fastener and a ratchet lever that is configured to rotate the socket to tighten the fastener,
a power head including a piston that is coupled to the ratchet lever such that movement of the piston causes the ratchet lever to rotate the socket, and
a proximity sensor configured to detect a presence of the ratchet lever,
the hydraulic power pack having a hydraulic pump and a hydraulic circuit configured cycle the piston by alternately providing a pressurized hydraulic fluid to opposite sides of the piston, and
a controller communicatively coupled to the proximity sensor and being configured to control the hydraulic power pack, wherein the controller is further configured to cause the hydraulic power pack to stop cycling the piston when the proximity sensor does not detect the presence of the ratchet lever within a predetermined time.