| Patents for B25B 21 - Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose (7,850) |
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| 05/08/1991 | WO1991006789A1 Motion converting mechanism and revolving tool |
| 05/01/1991 | CN1012484B Improved torque spanner |
| 04/30/1991 | US5011352 Deflection type thread lock for a threaded fastener |
| 04/30/1991 | US5011341 Two speed gear system for power tool |
| 04/30/1991 | US5010792 Socket wrench drill attachment |
| 04/28/1991 | CA2025793A1 Low profile rack and pinion wrench |
| 04/12/1991 | CA2025794A1 Dual mode torque wrench |
| 04/11/1991 | DE4019894A1 Hand held electric power tool with pistol grip handle - has motor and main weight concentrated in handle with short tool spindle for improved location and drive control via geared transmission |
| 04/09/1991 | US5005654 High torque hydraulic shoe bolt wrench |
| 04/09/1991 | US5005447 Torque wrench |
| 04/03/1991 | EP0420003A2 Powered impact wrench |
| 04/02/1991 | US5004054 Electric drill with speed and torque control |
| 04/02/1991 | US5003847 Hydraulic power wrench |
| 03/26/1991 | CA2021785A1 Powered impact wrench |
| 03/26/1991 | CA1281920C Ratchet wrench |
| 03/21/1991 | DE3930105A1 Precision suspension device for auger - consists of fixed plate with centering ring incorporating sealer rings and torque stabiliser |
| 03/20/1991 | CN2073352U Hydraulic wrench |
| 03/14/1991 | DE4000649A1 Spanner for screws and nuts - has rotary motor drive and non-turntable connection to spanner head housing |
| 03/06/1991 | CN2072469U Electric spanner |
| 02/26/1991 | US4995296 Large tire bolt fixing tool |
| 02/19/1991 | US4993288 Power driven replacement socket ratchet wrench |
| 02/13/1991 | CN2071114U 螺丝自动供给装置 Automatic screw feeding device |
| 02/13/1991 | CN2071112U Hydraulic torque moment setting wrench |
| 02/12/1991 | US4991663 Fluid operated power tool |
| 02/12/1991 | US4991473 Rotating driver with automatic speed switching and torque limiting controls |
| 02/12/1991 | US4991472 D.C. direct drive impact wrench |
| 02/05/1991 | US4989478 Turning apparatus |
| 01/29/1991 | US4987803 Power wrench |
| 01/29/1991 | US4987802 Power wrench |
| 01/24/1991 | DE4004464A1 Compact electric hand tool |
| 01/24/1991 | DE4004463A1 Switching device for range of modular electric hand tools - has internal of external manually controlled ring for operating interior switch plate and brush angle for reversing motor |
| 01/23/1991 | EP0408988A2 Universal electric motor |
| 01/23/1991 | EP0408987A2 Electric tool |
| 01/23/1991 | EP0408986A2 Switch device for electrical change-over switching of electric tools |
| 01/23/1991 | EP0408985A2 Hand held electric tool |
| 01/22/1991 | US4986369 Torque adjusting mechanism for power driven rotary tools |
| 01/15/1991 | CA1278933C Powered pipe wrench |
| 01/09/1991 | CN2068895U Impact screwing machine driven by internal combustion engine |
| 01/09/1991 | CN2068894U Automatic screwdriver with pneumatic press-on and feed |
| 01/08/1991 | US4983085 Threaded lockable fastener with swaged collar |
| 01/08/1991 | US4982626 Hydraulic torque wrench |
| 01/02/1991 | CN2068453U Batching moment of torque spanner |
| 12/27/1990 | EP0404035A2 Powered screwdriver |
| 12/26/1990 | CN2068043U Hand, electric belt screw unit |
| 12/25/1990 | US4979408 Screw tightening device |
| 12/20/1990 | DE3919648A1 Winkelschrauber Angle Driver |
| 12/20/1990 | DE3917828C1 Hydraulic socket spanner with revolving ring - has piston linked to piston rod connected to ratchet |
| 12/19/1990 | EP0403460A1 Power wrench for tightening screw joints |
| 12/18/1990 | US4977966 Seawater hydraulic rotary impact tool |
| 12/12/1990 | EP0401548A1 Device for a screw fastening tool |
| 12/12/1990 | EP0401294A1 Dual-mode corded/cordless system for power-operated devices |
| 12/11/1990 | US4976159 Dual mode torque wrench |
| 12/06/1990 | DE3917827A1 Power operated spanner with revolving ring - incorporates interchangeable lug inserts held in place by catch |
| 12/04/1990 | US4974476 Fluid-operated wrench |
| 12/04/1990 | US4974475 Cordless powered ratchet wrench |
| 11/28/1990 | EP0399290A1 Screwing and unscrewing device and automatic screwer with adjustable torque |
| 11/27/1990 | CA1276818C Adjustable motor-operated screw driving device |
| 11/22/1990 | EP0398655A2 Pressure detecting device for torque control wrench |
| 11/20/1990 | US4971156 Multi-section controlled auxiliary fittings to be attached to a wrench |
| 11/20/1990 | US4970920 Lever-actuated, hand-held, power tool |
| 11/20/1990 | US4970919 Torquing apparatus |
| 11/15/1990 | DE3915458A1 Screw setting tool on machine - comprises drill bit which fits tightly in hard metal plate in socket attachment |
| 11/06/1990 | US4967888 Safety clutch for motor-operated hand tool |
| 11/06/1990 | US4967852 Oil pressure type impulse torque generator for wrench |
| 10/30/1990 | US4966057 Power wrench |
| 10/16/1990 | US4962787 Fluid flow reversing and regulating ring |
| 10/16/1990 | US4962681 Modular manual electric appliance |
| 10/03/1990 | EP0390763A1 Screw tightening power tool |
| 10/02/1990 | CA1274707A1 Ratchet system for hand-held tools |
| 09/20/1990 | DE3908476A1 Drehschrauber Screwdrivers |
| 09/12/1990 | EP0386355A1 Power wrench |
| 09/12/1990 | EP0386008A1 Motor-driven apparatus for manipulating valves. |
| 09/06/1990 | DE3941752A1 Drehmomentvorrichtung Torque device |
| 09/04/1990 | US4954025 Anchor set tool |
| 09/04/1990 | US4953580 Bolted pipe joint releasable by remote control and combination tool therefor |
| 08/30/1990 | DE3905633A1 Offset screwdriver |
| 08/28/1990 | CA1273233A1 Power wrench |
| 08/23/1990 | DE3904085A1 Electric tool with a multi-step reduction gear and with a device, actuable at standstill, for changing the gear |
| 08/22/1990 | EP0382961A1 Fluid-operated wrench |
| 08/22/1990 | CN1044779A 液压转矩扳手 Hydraulic Torque Wrench |
| 08/16/1990 | EP0382408A1 Hydraulic torque wrench |
| 08/16/1990 | EP0382149A1 Power screw driver |
| 08/16/1990 | EP0381787A1 Improvements in wrenches |
| 08/14/1990 | US4947939 Structure of motorized screw bolt driving tool |
| 08/07/1990 | US4945790 Multi-purpose hand tool |
| 07/31/1990 | US4944641 Clutch engager sleeve |
| 07/24/1990 | US4942794 Torque tool |
| 07/24/1990 | US4942660 Device for locating the ideal screwing position of bolts of large dimensions |
| 07/17/1990 | US4941362 Torque and angular displacement sensing in controlled wrenches |
| 07/05/1990 | DE3843919A1 Motor-driven, adjustable-torque wrench for fastening elements with external functional faces |
| 06/26/1990 | US4936395 Fastening device with a screw and a pulsating tool for universal fastenings |
| 06/06/1990 | CN1008249B Method and apparatus for setting and loosening connecting screw thread |
| 05/31/1990 | WO1990005619A1 Collet lock for power tool |
| 05/29/1990 | US4928558 Torque master |
| 05/22/1990 | US4926699 Torque tool |
| 05/15/1990 | US4924734 Quick release and exchange socket drive |
| 05/15/1990 | US4924732 Power driven screwdriver with vacuum for removing contaminants |
| 05/10/1990 | DE3837942A1 Method and device for a screwing operation of modular design |
| 05/01/1990 | US4920836 Two blade type impulse wrench |
| 05/01/1990 | US4920831 Vehicle-carrying purpose wrench |