Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 8113095 | Torque measuring mechanism using cam engagement A device for delivering a predetermined amount of torque to a tool. The device has a handle and a cam assembly located within the handle. The cam assembly has a cam member integrally formed with a drive shaft. An adjustment ring is capable of rotating the cam assemb... | 02/14/2012 |
| 7665392 | Tightening tool Tightening tools is provided with a pair of clutch members disposed between a motor and a tool bit. The pair of clutch members is provided with a first engaging portion and a second engaging portion. The first engaging portion is constructed so as to disengage the p... | 02/23/2010 |
| 7467576 | Fixed torque limiting driver A clutch assembly for use with a torque limiting driver. The clutch assembly comprises two relatively roatable clutch plates, a driving plate and a camming plate, that face one another, with a plurality of rolling members housed between the two members. When the rol... | 12/23/2008 |
| 7370561 | Electric driver A power screwdriver (10) includes a bit holder (14) bored to receive the shaft of a screwdriver bit (12) and adapted to securely hold the screwdriver bit (12) in place, and a housing (18) having a through cavity (16). The bi... | 05/13/2008 |
| 7334509 | Torque limiting driver and assembly A method for assembling a torque-limiting driver, and the resulting drive. The method comprises the steps of providing a handle having a housing, drive assembly, and a testing assembly. The drive assembly is assembled, inserted into the testing assembly and calibrat... | 02/26/2008 |
| 7318691 | Tool apparatus for milling machine The present invention provides an automated-torque controlled tool for attachment to a milling machine. The tool comprises an elongated hollow housing defined by a neck section, a middle section, and a bottom section. The neck section is adapted to engage a spindle ... | 01/15/2008 |
| 7272998 | Torque-limiting mechanism A torque-limiting mechanism is provided for use in a variety of torque-applying tools. The mechanism includes a handle defining a housing in which are disposed a slip gear and a fixed gear. The fixed gear is attached to the housing while the slip gear is attached to... | 09/25/2007 |
| 7222559 | Screwdriver with torque setting mechanism A screwdriver comprises a torque setting mechanism including a torque adjustment ring, an actuation rod threadedly secured to the upper torque adjustment ring and a lower torque adjustment nut, a spring biased sleeve with the actuation rod passed, and a clutch ring ... | 05/29/2007 |
| 7219583 | Pneumatic screwdriver having an adjustable clockwise torque and a maximum counterclockwise torque A pneumatic screwdriver having an adjustable clockwise torque and a maximum counterclockwise torque includes a transmission seat having at least one steel ball hole and a through hole. The steel ball hole installs a steel ball and has a clockwise rotating area and a... | 05/22/2007 |
| 7197968 | Screwdriver with adjustable device to limit transmitted torque A screwing tool with a device to adjust transmitted torque comprises a handle to introduce a torque to the device, which is borne in the hollow of the handle and a drive shaft as an output element of the torque. On the drive shaft inside the handle, two separate cou... | 04/03/2007 |
| 7188557 | Tightening tool It is an object of the invention to provide a technique that can alleviate noise when the clutch comes into engagement. Representative tightening tool according to the invention comprises a motor, a driven shaft driven by the motor, a tool bit driven by the driven s... | 03/13/2007 |
| 7165663 | Power screwdriver with low-noise torque clutch A power screwdriver (1) with a rotationally driven, axially displaceable mounted tool spindle (2) with a low-noise torque clutch (3) which comprises a ratchet-spring biased ratchet coupling (6) driven by a driven ratchet part (12) ... | 01/23/2007 |
| 7137324 | Hand-held power screwdriver with a low-noise torque clutch A hand-held power screwdriver includes a low-noise torque clutch (5) for transmitting torque to a tool spindle (4) and formed of claw clutch (6) and ratchet clutch (7), with the ratchet clutch (7) having a rotatably driven first ra... | 11/21/2006 |
| 7107883 | Screw-driving tool for implant screws The invention relates to a screw-driving tool for implant screws having an elongate handle (2) and having a bar-shaped tool which is anchored in the elongate handle (2). An elastic, hollow spiral (10) is provided for the transmission of a predet... | 09/19/2006 |
| 7080582 | Screwdriver tool A screwdriver tool has a driving body and a tool shank mounted in the driving body so it can rotate about its axis. A device for transmitting a torque from the driving body to the tool shank interrupts the torque transmission if a predefined limiting torque is excee... | 07/25/2006 |
| 7069819 | Air motor socket wrench with quick socket release and muffler An air motor socket wrench has an air motor secured to a housing of a socket drive assembly having a socket drive member provided with a socket lock ball movable between a socket lock position and a socket unlock position. A hexagon body has inwardly inclined ramp s... | 07/04/2006 |
| 7032476 | Torque adjustable tool A torque adjustable tool includes an active member and a passive member which is removably connected to the active member by two respective clutch portions. Driving power is connected to the active member and the passive member outputs a torque. A spring is mounted ... | 04/25/2006 |
| 7000508 | Device for numerically displaying torque of torque wrench having a preset maximum torque Disclosed is a torque wrench comprising a signal generator including a spring biased against a trigger member, a sensor, and a disc biased between the spring and the sensor, a setting assembly including a cylindrical member for receiving the disc and the sensor, a c... | 02/21/2006 |
| 6978705 | Torque wrench A torque wrench including a wrench main body, a central push rod mounted in the main body and having an escape section, an adjustment handle adjustably fitted with one end of the main body and a restricting member locked on the central push rod. When adjusting the p... | 12/27/2005 |
| 6948410 | Torque wrench with sleeve for locking rotatable handle A torque wrench is provided having body and a handle that is rotatably mounted to the body for adjusting the torque setting, and an axially movable sleeve operable to selectively lock the handle. The sleeve includes a rigid member and an elastomeric member, such as ... | 09/27/2005 |
| 6640674 | Screwdriver having a variable torque-limiting in-line drive A screwdriver of the type having a variable torque-limiting in-line drive with a handle having a cavity and a drive bit disposed in the cavity. Over-ride drive members are disposed in the cavity and a spring exerts a force on the drive members for transmi... | 11/04/2003 |
| 6257107 | Manufacture of composite material hand tool A manufacturing method for a composite material hand tool. Its long and short fiber layers filling is covered with a metal interface ring at one side. The handle can be encircled into a cone shape. A center layer can be a short fiber honeycomb layer. The ... | 07/10/2001 |
| 6155147 | Torque screwdriver with indexing means lock An improved torque limiting screwdriver including a shaft extending from a first end of the screwdriver body, the shaft including a first plurality of indicia thereon, and an adjustment cap arranged to be located at a second end of the screwdriver body. T... | 12/05/2000 |
| 6109149 | Screw setting tool A screw setting tool including a housing (1), a tool spindle (8) located in the housing (1) and axially displaceable relative thereto, a bit stop (2) provided in the housing (1) for limiting an axial displacement of the tool spindle (8) in a direction opp... | 08/29/2000 |
| 6076439 | Torque screwdriver with indexing means An improved torque limiting screwdriver including a shaft extending from a first end of the screwdriver body, the shaft including a first indicia thereon, and an adjustment cap arranged to be located at a second end of the screwdriver body. The adjustment... | 06/20/2000 |
| 5984022 | Automatic shaft lock An automatic shaft lock is incorporated into the transmission or drive components of a power driving tool of the type commonly used to tighten or loosen threaded fasteners, for example. The automatic shaft lock operates to prevent an externally-applied ro... | 11/16/1999 |
| 5865076 | Clutch mechanism for screw tightening machine A clutch mechanism for a screw tightening machine having a clutchment and a main shaft, the clutchment interlocking with a screw tightening machine driving mechanism, the main shaft holding a screw tightening driver bit, the clutchment and the main shaft ... | 02/02/1999 |
| 5775186 | Power screw driver A power screw driver for tightening self-tapping screws comprises a housing (10), a rotation motor, an output shaft (12), a torque limiting release clutch (11) having torque transferring cam unit (17, 19) and a spring biassed thrust element (20) exerting ... | 07/07/1998 |
| 5568849 | Clutch mechanism in power driven screwdriver A power driven screwdriver including a housing, a spindle rotatably and axially movably disposed within the housing, a motor for driving the spindle, and a clutch mechanism interposed between the motor and the spindle. The clutch mechanism includes a driv... | 10/29/1996 |
| 5490439 | Nut tightening device A device comprises a housing having a planetary gear reduction mechanism accommodated therein and a handle projecting therefrom, an electric motor or like rotation source attached to the housing for inputting power to the reduction mechanism, an outer soc... | 02/13/1996 |
| 5437524 | Torque-adjustment controller Disclosed is a torque-adjustment controller for use with a tool to safely adjust and control the torque the tool works on a workpiece. The torque-adjustment controller mainly consists of a housing, an output shaft, an input shaft, a stepped ring, a lugged... | 08/01/1995 |
| 5239875 | Torque limiting tool A torque-limiting tool which comprises a drive member and a driven member. A plurality of balls extends from one of the members; a corresponding plurality of cylinders extends from the other. The relationship of the drive member and the driven member is s... | 08/31/1993 |
| 5203242 | Power tool for two-step tightening of screw joints A power tool for two-step tightening of screw joints by a first high speed step for tightening the screw joint to a predetermined torque snug level (T1) and a second low speed step for tightening the screw joint to a desired final torque level ... | 04/20/1993 |
| 5138916 | Power operated screwdriver A power operated screwdriver including a support shaft firmly secured to a motor housing, a gear driven by a motor shaft and rotatably mounted on the support shaft, a main spindle slidably mounted on the supported shaft and holding a detachable drill bit,... | 08/18/1992 |
| 5129465 | Screw tightening power tool A screw tightening power tool, comprising a rotation motor, a power supply (27) connected to the motor, an output shaft (13), a torque responsive release clutch (14) including a driving half (16) and a driven half (17) and coupling the motor to the output... | 07/14/1992 |
| 5101947 | Connectable drive for a screwdriver spindle A device for driving a screwdriver spindle has a claw clutch and an over-detent clutch. The two clutches are arranged coaxially to each other and have coupling parts which are displaceable in an axial direction. Upon a first response of the over-detent cl... | 04/07/1992 |
| 5094133 | Screwdriver with switch-off means for screw-in depth and screw-in torque To improve a power-operated screwing tool machine comprising a drive arranged in a housing, a screwing tool and a switch-off means for the screw-in depth including a depth stop held on the housing for fixing a screw-in depth and a clutch arranged between ... | 03/10/1992 |
| 4967888 | Safety clutch for motor-operated hand tool A safety clutch for a motor-driven hand tool breaks the rotational drive train when a working tool becomes seized in a receiving material. The safety clutch includes coupling members (25) positioned in a part (22) for transmitting rotational movement to t... | 11/06/1990 |
| 4901610 | Adjustable torque controlling mechanism An ajustable torque controlling mechanism has a drive shaft for driving connection with a member to be driven and a torque releasable clutch connected with the shaft and including a wear resistant torque sensitive ball detent release device and a compress... | 02/20/1990 |
| 4867019 | Screwdriving tool A screw driving tool comprises a housing in which are located two plates having recesses therein in which balls are received. One plate is adjustable located in the housing whilst the other plate is slidable therein and biased by a spring towards the loca... | 09/19/1989 |
