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Class Information
Number: 81/469
Name: Tools > Wrench, screwdriver, or driver therefor > Responsive to torque on work > Means for regulating motor
Description: Wrench or screwdriver including means which is responsive to the amount of torque on the work and regulates the power output of a motor driving the work-contacting portion of the wrench or screwdriver.










Sub-classes under this class:

Class Number Class Name Patents
81/470 Fluid motor 59


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8640780 Torque wrench system having multiple torque stations Feb. 4, 2014
8607674 Manually driven and self-contained, controlled tightening hydraulic wrench Dec. 17, 2013
8347972 Torque wrench system having multiple torque stations Jan. 8, 2013
8316741 Power tool and a method for use of the power tool Nov. 27, 2012
8261642 Power wrench with reaction bar controlling means Sep. 11, 2012
8217610 Power tools Jul. 10, 2012
8210275 Power tools Jul. 3, 2012
8171827 Power screwdriver May. 8, 2012
8157018 Torque wrench system having multiple torque stations Apr. 17, 2012
8096211 Digital power torque wrench of indirect transmission Jan. 17, 2012
8020626 Torque wrench system having multiple torque stations Sep. 20, 2011
7896098 Power tools Mar. 1, 2011
7735398 Rechargeable motor-driven ratchet wrench having power-off protection Jun. 15, 2010
7562589 Display device for an electronic torque wrench Jul. 21, 2009
7488173 Instrument with pressure sensing capabilities Feb. 10, 2009
7311027 Electric screwdriver Dec. 25, 2007
7210541 Transducerized rotary tool May. 1, 2007
7185562 Disposable battery powered screw driver, locking mechanism, and accessories Mar. 6, 2007
7090030 Tranducerized torque wrench Aug. 15, 2006
7082866 Ratcheting torque-angle wrench and method Aug. 1, 2006
6871153 Dynamic calibration qualifier Mar. 22, 2005
6840138 Device for screwing on caps Jan. 11, 2005
6836614 Electrical power tool having a motor control circuit for providing control over the torque output of the power tool Dec. 28, 2004
6523442 Torque tool assembly Feb. 25, 2003
6390205 Power tool system with programmable control unit May. 21, 2002
6247387 Fastening apparatus Jun. 19, 2001
6164165 Tube spinner Dec. 26, 2000
6109149 Screw setting tool Aug. 29, 2000
6105475 Tightening device Aug. 22, 2000
6053080 Device for tightening bolt and/or nut Apr. 25, 2000
5953965 Device for tightening bolt and nut Sep. 21, 1999
5881613 Screwdriver having disengaging mechanism Mar. 16, 1999
5816121 Cordless fastening tool Oct. 6, 1998
5754019 Method and circuit arrangement for operating an electric motor May. 19, 1998
5672922 Commutator motor Sep. 30, 1997
5637968 Power tool with automatic downshift feature Jun. 10, 1997
5490439 Nut tightening device Feb. 13, 1996
5457866 Bolt-tightening method using an impact wrench Oct. 17, 1995
5404775 Right angle fastening device Apr. 11, 1995
5361852 Screwing apparatus Nov. 8, 1994
5353882 Screwing apparatus Oct. 11, 1994
5203242 Power tool for two-step tightening of screw joints Apr. 20, 1993
5195406 Power wrench Mar. 23, 1993
5172774 Axially compact torque transducer Dec. 22, 1992
5154242 Power tools with multi-stage tightening torque control Oct. 13, 1992
5115701 Drive mechanism and strain gauge mounting for a nutrunner appliance May. 26, 1992
5094301 Programmable pulsed torque recovery system Mar. 10, 1992
5044234 Electrical screwdriver Sep. 3, 1991
5014794 Power driven tool and drive system therefor May. 14, 1991
4987806 Electronic control circuitry for a nutrunner Jan. 29, 1991

1 2










 
 
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