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Browse by Category: Main > Tools & Hardware
Class Information
Number: 81/57.39
Name: Tools > Wrench, screwdriver, or driver therefor > Machine > Step by step
Description: Wrench or screwdriver comprising a clutching element so arranged that the movement of the wrench handle in one direction will drive the work engaging means while movement in the opposite direction permits relative movement between the handle and work engaging means.










Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8650990 Hand-operated hydraulic wrench for high torque tightening and loosening Feb. 18, 2014
8607674 Manually driven and self-contained, controlled tightening hydraulic wrench Dec. 17, 2013
8584555 Open-end ratchet wrench Nov. 19, 2013
8375828 Power driven ratchet wrench Feb. 19, 2013
8122789 Device for tightening of a gland nut Feb. 28, 2012
8117947 Power ratchet assembly Feb. 21, 2012
8096211 Digital power torque wrench of indirect transmission Jan. 17, 2012
8051746 Ratchet wrench with collar-actuated reversing mechanism Nov. 8, 2011
8024996 Power wrench Sep. 27, 2011
7926389 Hydraulic torque wrench with central strain decoupled global hose connect swivel Apr. 19, 2011
7793568 Ratchet mechanism Sep. 14, 2010
7765895 Fluid-operated torque wrench for and method of tightening or loosening fasteners Aug. 3, 2010
7735398 Rechargeable motor-driven ratchet wrench having power-off protection Jun. 15, 2010
RE40765 Fluid-operated power tool Jun. 23, 2009
7497147 Torque tool for tightening or loosening connections, and method of tightening or loosening the same Mar. 3, 2009
7475609 Power ratchet wrench Jan. 13, 2009
7454997 Axial pawl ratchet mechanism Nov. 25, 2008
7451672 Link attachment to torque wrench Nov. 18, 2008
7413025 Torque tool Aug. 19, 2008
7392726 Ratchet wrench and method of assembling the same Jul. 1, 2008
7306050 Toothed ring connecting structure of a power tool Dec. 11, 2007
7261018 Power tool Aug. 28, 2007
7171873 Tensionless power ratchet wrench assembly Feb. 6, 2007
7168341 Torque wrench Jan. 30, 2007
7146880 Torque wrench system Dec. 12, 2006
7137318 Ratchet-based, torqued-enhanced fastener tool Nov. 21, 2006
7121167 Flat head reversible power ratchets Oct. 17, 2006
7117764 Screwed device tightening/untightening tool Oct. 10, 2006
7086311 Pneumatic ratchet wrench Aug. 8, 2006
7082858 Hydraulic torque wrench system Aug. 1, 2006
7080578 Hand tool with impact drive and speed reducing mechanism Jul. 25, 2006
7069819 Air motor socket wrench with quick socket release and muffler Jul. 4, 2006
7062992 Constant rotation rotary torque multiplier Jun. 20, 2006
7062993 Torque wrench Jun. 20, 2006
7059217 Tensionless power ratchet wrench assembly Jun. 13, 2006
7021179 Pressure-operated power screwdriver having a measuring section Apr. 4, 2006
6997083 Motorized conduit linking device and method Feb. 14, 2006
6993997 Ratchet wrench Feb. 7, 2006
6966239 Driving shaft for a ratchet spanner Nov. 22, 2005
6931965 Portable pipe tong and method of use Aug. 23, 2005
6925911 Fluid-operated power tool Aug. 9, 2005
6923095 Tensionless power ratchet wrench assembly Aug. 2, 2005
6912933 Hydraulic torque wrench system Jul. 5, 2005
6883401 Power tool for fastening objects Apr. 26, 2005
6871569 Tool having rotatable driving head Mar. 29, 2005
6860174 Hand-held power tool Mar. 1, 2005
6851335 Tong with composite belt and methods for making and using same Feb. 8, 2005
6810773 Open end ratchet wrench Nov. 2, 2004
6802235 Fluid-operated torque wrench Oct. 12, 2004
6789448 Power ratchet wrench Sep. 14, 2004

1 2 3 4 5 6










 
 
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