Class 91/59 - TORQUE RESPONSIVE MOTIVE FLUID CONTROL

Subclass of Class 91 - Motors: expansible chamber type
Definition: Apparatus in which a variation of rotational load imposed
No. of patents: 38
Last issue date: 12/18/2007

Number	Title	Issue Date
7308949	Concrete drill A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) cont...	12/18/2007
7165469	Shift rod piston seal arrangement for a vibratory plate compactor An easily accessible phase adjustment mechanism for a vibratory plate compactor includes an improved seal arrangement to protect against leakage of internal lubricating oil into the hydraulic cylinder providing fluid pressure to the adjustment mechanism. An easily d...	01/23/2007
7146715	Spin pressure power tool Apparatus for installing a rivet nut or the like having an intentionally threaded shaft wherein the apparatus includes a hydraulically geared power tool having an inner hydraulic fluid containing a chamber and a screw adapted to engage the threaded shaft of the nut ...	12/12/2006
6611415	Fail-safe circuit Provision of a fail-safe circuit which is capable of allowing a sub circuit to operate with reliability when a main circuit encounters abnormal conditions even in a system with only one supply source of pressure oil. A plurality of solenoid type control v...	08/26/2003
6192782	Torque control means for hydraulic motor A fluid pressure control system for limiting the torque output of a positive displacement hydraulic motor (21) for rotating a screw anchor (11, 11') into the ground. A normally closed solenoid operated control valve (76) is mounted in a bypass line (86) b...	02/27/2001
5904067	Adjustable-torque screwdriving spindle assembly A screwdriving spindle assembly comprising a spindle shaft provided with a holding device and secured to a gear wheel rotated by a drive assembly which comprises a pressurized fluid actuating cylinder having a piston rod secured to a transmission system, ...	05/18/1999
5737992	Method and device for controlling a double-acting cylinder actuated by a pressurized fluid Method for controlling a pressurized fluid-actuated double acting cylinder in an assembly such as a hydraulic tightening spanner (1) with a control unit therefor, wherein a piston (5) may be reciprocated repeatedly, firstly with an active stroke providing...	04/14/1998
5617771	Auto cycle pump An auto cycle pump in accordance with the invention includes a housing having a reservoir for storing hydraulic fluid. A hydraulic pump in the housing provides hydraulic flow. A directional valve has neutral, advance and retract positions to respectively ...	04/08/1997
5614778	Servo cylinder apparatus Compressed air is introduced into a cylinder chamber to displace a piston closely to a target position. Then, a ball screw shaft is rotated about its own axis by an electric motor to inch the piston to the target position. Upon arrival of the piston at th...	03/25/1997
5570577	Anchor torque controller for anchor installing machines A torque controller which limits the output of a hydraulic motor is provided. The torque controller includes a by-pass circuit which allows the hydraulic fluid in the hydraulic fluid circuit to by-pass the motor. A valve manifold is placed in the by-pass ...	11/05/1996
5421240	Autoshut-off device for oil pressure type pulse wrench This invention is intended to effect torque control of high accuracy by detecting the oil pressure at the time of the generation of a pulse which forms the basis of the generated torque for a torque wrench and using the data thus obtained the effect torqu...	06/06/1995
5377578	Torque control system An air tool torque control system includes a controller operative to independently control two air tools with continuous programmed adjustment of the torque shut off point for each tool after each fastener joint is made. The torque specification is measur...	01/03/1995
5217079	Hydro-impulse screwing device A hydro-impulse screwing device comprises a rotary drive motor, a power source for the motor, a drive shaft, a pulsating hydraulic drive connecting the motor to the shaft and a power cut-off for the motor. The load at which the power cut-off functions is ...	06/08/1993
5105719	Stroke control device with torque responsive motive fluid control A stroke control device having a servomotor, a hydraulic cylinder having a piston, a ball-thread mechanism coupling the servomotor with the piston, and a hydraulic circuit including pressure control valves for driving the hydraulic cylinder. Further it ha...	04/21/1992
4844176	Air tool with torque shut-off valve The air tool of the present invention includes a torque shut-off valve totally enclosed within and substantially coaxial with the body housing of the tool. The torque shut-off valve includes a valve member reciprocally sliding in and guided by a bore and ...	07/04/1989
4721166	Automatic shut-off valve for power tools A fluid-actuated shut-off valve for a fluid-powered tool such as a wrench including a spool valve urged to open position by a spring and having respective valve-operating surfaces subject to both regulated inlet and exhaust pressures in the tool. The valv...	01/26/1988
4604943	Impulse tool having shut off system An impulse tool has an air motor connected to rotate a housing that carries a spindle adapted to be connected to a tool. The housing and cavity provide a pulsating force for rotating the spindle and tool to a pre-selected torque limit. When the limit is r...	08/12/1986
4571976	Blind riveting apparatus for rivets of different sizes In a blind riveting apparatus for rivets of different sizes, with a compressed air feed line and an actuating means controllable by the compressed air, and a rotary motor, provided at the inlet (6) of the compressed air feed means (9) into the blind rivet...	02/25/1986
4492146	Shut-off device for a fluid driven motor The present invention relates to a device for shutting off a supply of pressurized motive fluid to an associated fluid driven motor in response to a predetermined motor back pressure indicating a predetermined load on the motor. The device comprises a hou...	01/08/1985
4483236	Pneumatic throttle control A pneumatic throttle control configuration provides synchronized start-up and independent shut-off of multiple pneumatic tools. Each tool includes a throttle control assembly having a manually operable throttle valve which selectively admits air to the va...	11/20/1984
4444272	Overspeed safety device In a pneumatically powered rotating grinding machine there is provided a safety unit (13) comprising a speed governor and an overspeed release mechanism the purpose of which is to ensure a predetermined maximum speed. For safety reasons, the motor speed m...	04/24/1984
4434858	Air tool with stall torque regulator and air biasing mechanism The air tool of this invention features a shut-off valve in a motor inlet passage with an air bias compartment at one end of the valve and a motor pressure compartment at an opposite end of the valve directly communicating with the inlet to the motor. The...	03/06/1984
4355566	Valve driving apparatus A valve driving apparatus comprising a case proper provided in the interior thereof with a movement conversion-transmission mechanism, a cylinder mechanism freely detachably fixed to one end of the case proper and a piston rod supporting mechanism freely ...	10/26/1982
4320806	Power tool, in particular a hand-held compressed air screw driver A pneumatic screwdriver or nutsetter includes a manually actuated electrical switch and a solenoid operated motive air shutoff valve which includes a spring biased reset element for moving the shutoff valve closure element from a valve closed position to ...	03/23/1982
4318334	Torque control for a fluid operated motor A torque control for a fluid operated motor includes a first gear to be driven through operation of the motor and a second gear in driving engagement with said motor and maintained in a generally stationary position during normal operation thereof. The to...	03/09/1982
4305472	Apparatus for recording and limiting torque Apparatus for recording and limiting the torque applied to a pipe by a set of power tongs, wherein the tongs are operated by a hydraulic fluid pumped through a feed line to a hydraulic motor in the tongs and then returned by a return line. The apparatus i...	12/15/1981
4300641	Torque responsive, dual speed rotary power driver A rotary power driver is provided which drives with a two-stage torque and speed control, wherein the initial driving is done at higher speed and lower torque, and a subsequent higher torque is automatically imposed with lower speed. The second stage is a...	11/17/1981
4278427	Compressed-air dental motor A compressed-air dental motor includes a housing, a rotor, a compressed air inlet conduit supplying compressed air for placing the rotor into rotation, and a rotor shaft in the rotor connectable with a work tool, such as a drill. A valve member in the hou...	07/14/1981
4267914	Anti-kickback power tool control An impending kickback condition is the operation of a power tool or machine tool system is sensed and used to control or eliminate the kickback. The ability to sense an impending kickback condition can be used in all categories of power driven tools. The ...	05/19/1981
4261213	Friction transmission A friction transmission having at least one friction disc formed as a rotating presser cylinder of a piston firmly connected with the associated shaft, with load-dependent hydraulic generation of the pressing forces, where at least on one transmission sha...	04/14/1981
4249453	Fluidic motor actuator A control system for a motor through which a specific rotary output is obtained from a given input signal by controlling an operational supply of fluidic energy. The control system includes a direct mechanical servo which receives the input signal to cont...	02/10/1981
4243111	Automatic shut-off valve for power tools A fluid-actuated shut-off valve for a fluid-powered tool such as a wrench including a spool valve urged to open position by a spring and having respective valve-operating surfaces subject to both regulated inlet and exhaust pressures in the tool. The valv...	01/06/1981
4223745	Torque responsive motor shutoff mechanism for fluid operated tool A pneumatic torque tool includes a torque responsive mechanism which actuates a valve closure member by release of an elongated actuating rod. A movable valve seat is biased in a first position by pressure fluid supplied to the tool and upon release of th...	09/23/1980
4222702	Deceleration sensitive air tool shutoff A shutoff mechanism for a pneumatic tool such as a nut runner senses both the instantaneous speed and the instantaneous rate of change of speed of the drive components of the tool. The mechanism controls the flow of air to the motor and terminates such fl...	09/16/1980
4083379	Pressure medium regulating device Pressure medium regulating device in which a fluid cell is positioned between the inlet and outlet of the device. The inlet is connected to a source of pressure medium and the outlet to a motor or other apparatus fed and operated by the regulating device....	04/11/1978
4049104	Power operated torque tool In a power operated torque tool, the pressure-fluid feed is controlled by a valve which opens to start the tool, and closes to stop it. This valve is mounted on the end of a push-rod which extends along the axis of the tool. The tool also has a clutch whi...	09/20/1977
4023627	Air shut-off tool This invention relates to power tools and more particularly to an air-operated power tool commonly used for automotive or other assembly operations for installing threaded fasteners. The device of this invention shuts off the power tool as it approaches t...	05/17/1977
3998130	Pressure driven motor Fluid motor means having a sectional housing containing a fluid flow passage therebetween is provided. The passage has a cross section which varies in response to load changes, along with means in the passage for varying the flow of pressure fluid to the ...	12/21/1976

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Class 91/59 - TORQUE RESPONSIVE MOTIVE FLUID CONTROL