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| Number | Title | Issue Date |
| 7555971 | Self-contained hydraulically operated tool A compact, hydraulically operated tool for use in hard-to-reach or compact spaces. ... | 07/07/2009 |
| 7413029 | Screw fastening machine The present invention aims to provide a screw fastening machine for reliably switching and changing a driving force transmitting path with the seating on a work as a reference. According to the screw fastening machine in which a first pulley is connected to a... | 08/19/2008 |
| 7396197 | Force-balanced air supply for pneumatic tools The non-axial force exerted on a pneumatic tool by a non-axial air supply is balanced to allow for uniformly radially distributed compliance forces on the tool. An annular air ring is disposed around the pneumatic tool, covering an air inlet port. Air is supplied by... | 07/08/2008 |
| 7370559 | Pneumatically operated screw driver A pneumatically operated screw driver ensuring a complete return of a piston to its top dead center. The screw driver has a compressed air return chamber for returning the piston to its top dead center by applying a compressed air in the return chamber to the piston... | 05/13/2008 |
| 7185713 | Air-driven screwdriver performs hole drilling, thread tapping and bolt tightening A novel air-driven screwdriver is integrally designed to perform three functions, hole drilling, thread tapping and bolt tightening with special characteristic in which a passive inner gear assembly is employed as a driver to replace the clutch as used by the prior ... | 03/06/2007 |
| 7165478 | Pneumatically operated screw driver A pneumatically operated screw driver ensuring a complete return of a piston to its top dead center. The screw driver has a compressed air return chamber for returning the piston to its top dead center by applying a compressed air in the return chamber to the piston... | 01/23/2007 |
| 7165481 | Screwdriver A screwdriver includes a driver portion, a slider case having a guide slot, a slider (7), comprising parts (7A) and (7B) reciprocating, in the slider case, an arm portion comprising shaft arm (16) and clutch arm that is supported and rota... | 01/23/2007 |
| 7146880 | Torque wrench system An improved hydraulic wrench including a one-piece housing in which one end of the housing forms internally a cylinder for hydraulically reciprocating power and the second end of the housing includes an opening in which a torque arm/ratchet mechanism can be pivotall... | 12/12/2006 |
| 7117764 | Screwed device tightening/untightening tool A tool for tightening and untightening screwed devices, such as bolts for fixing engines (10) to struts (12) on aircraft, comprises a hydraulic wrench (20), a hydraulic pump (22), preferably manual, at a distance from the wrench, and a tu... | 10/10/2006 |
| 7104433 | Safety apparatus of air impact driver A nose (5) of an air impact driver (1) is mounted with a slidable contact nose (12) and by the contact nose, a contact valve (23) upward therefrom is operated to switch. An AND circuit operated to pilot an air motor controlling pilot valv... | 09/12/2006 |
| 7082858 | Hydraulic torque wrench system A hydraulic torque wrench having a separate ratchet unit and hydraulic cylinder drive unit connectable by an overlapping cylindrical connection at selected angles of rotation providing clearance in use. The hydraulic cylinder actuates the ratchet mechanism by a conn... | 08/01/2006 |
| 7062993 | Torque wrench A torque wrench includes a housing having a first opening disposed opposite a second opening. The torque wrench also includes a ratchet wheel disposed in the housing and forming a shaft connecting the first opening and the second opening, a ratchet lever engaging th... | 06/20/2006 |
| 7032482 | Tensioning device apparatus for a bottom feed screw driving tool for use with collated screws A portable hand-held screw driving tool is provided for use with collated strips of screws. A collated strip of screws enters from the “bottom” area of the tool and runs through a fixed guide along a front area of the tool's handle, and then to a movable slide b... | 04/25/2006 |
| 7013985 | Pneumatically operated screw driver A compact and light-weight pneumatically operated screw driver providing high speed screw fastening with high operability. A rotary member rotationally driven by a pneumatic motor includes a main rotary member made from a plastic material and a sliding segment fixed... | 03/21/2006 |
| 6966240 | Hydraulic ratchet wrench with double-action hydraulic cylinder piston drive 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... | 11/22/2005 |
| 6942042 | Pneumatic motor-controlled valve of screwdriver A pneumatic motor-controlled valve of a screwdriver is installed between an air guide hole of a pneumatic motor and a main air valve gate in the screwdriver. A valve hole is formed on a guide seat and is communicated to an air guide hole of the motor. A plug is form... | 09/13/2005 |
| 6928902 | Air powered wrench device with pivotable head and method of using An air powered wrench device with a pivotable head and associated method of using. The device comprises a handle pivotally attached to an arm. The handle comprises a housing, an air intake nozzle, an air driven motor, a drive shaft, a ball bearing collar, a universa... | 08/16/2005 |
| 6912933 | Hydraulic torque wrench system A hydraulic torque wrench having a separate ratchet unit and hydraulic cylinder drive unit connectable by an overlapping cylindrical connection at selected angles of rotation providing clearance in use. The hydraulic cylinder actuates the ratchet mechanism by a conn... | 07/05/2005 |
| 6880431 | Pneumatically operated screw driver having drive bit attaching and detaching mechanism A pneumatically operated screw driver driven by a compressed air to drive screws into a workpiece. A drive bit connecting portion is rotated in a right-hand direction by rotation of a pneumatic motor and is formed with a right-handed threaded hole. A drive bit is fo... | 04/19/2005 |
| 6843400 | Pneumatic motor driving valve of screw nail gun A pneumatic motor driving valve of a screw nail gun has a driving valve for control the pneumatic motor to be operated steadily. A downward pressing spring is installed around an outer wall of the cylinder of the gun body and an annular control valve is installed ar... | 01/18/2005 |
| 6802235 | Fluid-operated torque wrench A fluid operated torque wrench has a housing having a cylinder portion with a cylinder having an axis and a driving portion; two pistons movable in the cylinder along the axis independently from one another and having piston rods; two ratchet-lever mechanisms locate... | 10/12/2004 |
| 6715381 | Adjustable reaction arm for torque power tool, and torque power tool provided therewith A reaction arm is connectable to a torque power tool and has a distal portion adapted to abut against an outside object and a proximal portion connectable with a tool housing and provided with a second engaging formation formed so that in an operative position the s... | 04/06/2004 |
| 6672404 | Screw fastening machine Two guide members cooperatively constitute a chuck portion for holding a screw head. Opening and closing of the chuck portion is regulated depending on a mutual position between a machine body and a member into which a screw is driven. Guide pin portions ... | 01/06/2004 |
| 6553873 | Hydraulic wrench control valve systems A wrench assembly including a drive head and an attached socket for engaging a bolt or nut. When the drive head turns, the socket and any engaged threaded member will also rotate. A hydraulic motor and cylinder are also included. The hydraulic motor and c... | 04/29/2003 |
| 6532845 | Method of and an apparatus for tightening threaded connectors For tightening threaded connectors, a plurality of fluid-operated torque tools are used, each engaging with a respective of one threaded connector. It is sensed when at least one of the fluid-operated torque tools reaches a point during an advance stroke ... | 03/18/2003 |
| 6439316 | Power tong with shutdown system and method A power tong 10 for making up and breaking apart threaded oilfield tubular connections includes a frame 11 having an open throat 20, a rotary ring 16 having an open throat 22, and a door 24 for closing over the open throat for safety. Hydraulic motor 42 i... | 08/27/2002 |
| 6311585 | Flow regulation device The present invention relates to a flow regulation device for mitigating over travel of a piston in a fluid operated tool. The flow regulation device includes a flow channel through which flows an operating fluid to be supplied to operate the piston withi... | 11/06/2001 |
| 6155139 | Pneumatically operable screw driver An air motor is provided in a housing and driven by the compression air introduced from an intake port. An anvil, receiving the rotational force of the air motor, has a rear end accommodated in the housing and a front end protruding out of the housing. A ... | 12/05/2000 |
| 6119557 | Power tong with shutdown system and method A power tong 10 for making up and breaking apart threaded oilfield tubular connections includes a frame 11 having an open throat 20, a rotary ring 16 having an open throat 22, and a door 24 for closing over the open throat for safety. Hydraulic motor 42 i... | 09/19/2000 |
| 6112622 | Fluid-operated tool A fluid-operated tool for tightening and loosening threaded connectors has a ratchet unit including a ratchet connectable with a threaded connector to be tightened and loosened and provided with a plurality of teeth, and a pawl engageable in and disengage... | 09/05/2000 |
| 6073521 | Pneumatically operable screw driver A main valve and a manual operating valve cooperatively control the compressed air supplied to an air motor and a piston. The main valve is responsive to the compressed air supplied from the manual operating valve via an air passage. An orifice is provide... | 06/13/2000 |
| 6029546 | Reaction member system for rotary fluid-operated wrenches A reaction system for use in combination with a fluid-powered wrench tool in assembling or disassembling large size tube fittings of a variety including a fastener or nut which is threadably engagable with a port end of the fitting body. The system includ... | 02/29/2000 |
| 6026713 | Pneumatically operated screw driver An air motor has a rotor rotatable in response to the pressure of pressurized air. A cylindrical rotary member is connected to the air motor for causing a rotation in synchronism with the rotation of the rotor. A rotary slider is slidable in the axial dir... | 02/22/2000 |
| 6012360 | Hydraulic wrench with gripping force proportional to applied torque A hydraulic wrench for loosening large diameter threaded components has a swing body pivotally attached to a base, a clamp support, a lever and a hydraulic cylinder. The clamp support is slidably mounted on the swinging body, and a spring (or passive hydr... | 01/11/2000 |
| 5924340 | Fluid-operated tool A fluid-operated tool for tightening and loosening of threaded connectors has a turnable engaging unit for engaging a threaded connector so as to turn the threaded connector and to tighten and loosen the threaded connector; and driving unit connected with... | 07/20/1999 |
| 5730035 | Pneumatically operated screw driver A pneumatically operated screw driver having a moving unit rotatable about its axis by rotation of a rotor and movable axially by a pneumatic pressure. The moving unit includes a spline shaft supported by the rotor through a ball spline, and a drive bit a... | 03/24/1998 |
| 5638725 | End cap assembly for a fastener installation tool An end cap assembly for a fastener installation tool is shown. The end cap assembly includes an end cap received within a housing of the fastener installation tool. The end cap assembly also includes a protective cover plate positioned to cover the joint ... | 06/17/1997 |
| 5546749 | Nail gun handle extension A handle extension for an air powered tool. The extension has been designed for use with a nail gun, but the mechanism is suitable for any air powered hand tool. The device includes a jointed, tubular extension that is affixed to the tool. The device furt... | 08/20/1996 |
| 5515753 | Power wrench The power wrench comprises a housing (10) consisting of a head portion (11) and a driving portion (12). The driving portion (12) includes a cylinder bushing (21) which is introduced into the housing (10) through an opening (22) on the side facing away fro... | 05/14/1996 |
| 5467671 | Fluid-operated torque tool A fluid-operated torque tool for tightening and loosening threaded connectors has an engaging element having an axis and two axial ends with at least one of the ends adapted to engage a threaded connector to be tightened or loosened, and a driving element... | 11/21/1995 |
