Patent Number: 6,966,240

Title: Hydraulic ratchet wrench with double-action hydraulic cylinder piston drive

Abstract: The invention relates to a hydraulic ratchet wrench with a double-action hydraulic cylinder piston drive with a gear pump (20) and a piston pump (21). According to the invention, a working stroke and a return stroke are controlled through a reversal of rotational direction of a pump motor (4), whereby the necessary flow volume is produced automatically via internal flow control valves, and without additional valve controls.

Inventors: Kipfelsberger; Alexander (85051 Ingolstadt, DE)


International Classification: B25B 21/00 (20060101); F15B 7/00 (20060101); F15B 7/04 (20060101); B25B 013/50 ()

Expiration Date: 1/22/02018