Abstract: A pneumatic screw driving device includes a terminal element intended to cooperate with an element to be tightened/untightened and a body. The body houses: a pneumatic motor capable of rotationally driving the terminal element; an air intake into the motor; and a setting element for setting an intake section of the air intake into the motor. The setting element can take at least: a fixed state in which the intake section is fixed; and a setting state in which the intake section is adjustable between at least two values.

Abstract: A vane air motor is disclosed which is configured to prevent grease in a radial bearing from leaking into a rotor chamber. The vane air motor has a motor housing (20) having a rotor chamber, a rotor (22) with vanes (24) disposed in the rotor chamber, a first end wall (16) of the motor housing equipped with a radial bearing (50) rotatably supporting a support shaft portion (28) of the rotor, and a casing contiguously joined to the motor housing to form a compressed air supply chamber (44) together with the first end wall to supply compressed air into the rotor chamber through an air supply hole (46) formed in the first end wall. The first end wall has communication means (16-5, 16-6 and 16-7) for supplying compressed air from the compressed air supply chamber to the side of the first radial bearing closer to the rotor.

Abstract: An air driven tool for use in a machining center, the air driven tool including an adjustable speed regulator and a turbine. The turbine is driven by pressurized air directed thereto. The turbine is rotatable about an axis. A flow of the air is regulated by the adjustable speed regulator. The adjustable speed regulator includes a biasing member, an inclined annular surface, a regulator plate and a plurality of moveable bearings. The inclined annular surface has an angle relative to the axis. The plurality of movable bearings are positioned between the inclined annular surface and the regulator plate. The biasing member biases the inclined annular surface and/or the regulator plate toward each other.

Abstract: Disclosed is a speed controller of the ball cone type having a unique conical head which serves as a face seal valve and further encloses seals and protects the governor against entry of particulate matter.

Abstract: An improved torque control mechanism for a rotary vane, air motor tool includes acceleration and speed responsive slidable elements positioned in grooves that lie in a plane transverse to the spin axis of the motor and which form an angle with the radii extending from the spin axis. The elements cooperate with a cam plate which operates a fluid supply valve to close off air supply to the tool whenever torque of the tool causes the speed of the motor to decrease below a threshold level. A bypass valve and passage is manually operable to initiate operation of the air motor. An auxiliary low volume, low pressure valve and passage permits an operator to provide minor adjustments of the orientation of the output shaft of the tool. For reverse operation, the speed and acceleration control is eliminated by operation of a reverse operation control mechanism.

Abstract: A rotary pneumatic tool includes an over-speed shut-off mechanism including a shiftable spring washer and flyweights for imparting a shifting force to the spring washer dependent on the speed of the tool. In the preferred embodiment, the spring washer is shifted by spherical balls restrained by cylindrical walls within a body affixed to the rotor in combination with the spring washer and spring members attached to the body. The spring rates of the spring washer and spring members predetermine the speed at which the over-speed mechanism becomes activated.

Abstract: In a pneumatically powered portable tool there is provided a speed governor and an overspeed safety device the purpose of which are to ensure a predetermined maximum speed by controlling the air inlet flow to the motor. A cup-shaped shell insert (28) is detachably mounted in the housing (10) to form with the latter an air supply passage (58) and to support the valve means (51,53) of the overspeed safety device. The top surface of the shell insert (28) is exposed through an aperture (57) in the housing (10) and carries the maximum speed marking of the tool.

Abstract: In a pneumatically powered portable tool there is provided a speed governor and an overspeed safety device the purpose of which are to ensure a predetermined maximum speed by controlling the air inlet flow to the motor. A cup-shaped shell insert (28) is detachably mounted in the housing (10) to form with the latter an air supply passage (58) and to support the valve means (51,53) of the overspeed safety device. The top surface of the shell insert (28) is exposed through an aperture (57) in the housing (10) and carries the maximum speed marking of the tool.

Abstract: The present invention comprises a combined speed sensor and control valve for a rotary fluid motor such as a rotary vane air motor. Weights are pivotally attached to the opposite sides of the rotating output shaft of the air motor and are spring biased into engagement with an annular valve disc member positioned over the air inlet. Upon excessive speed of the shaft, the weights swing from engagement with the valve disc member and release the member. Air flow and air pressure within the air inlet passage cause the disc member to translate axially along the rotary shaft and close the air inlet. The air motor must be disassembled and the overspeed control reset prior to continued operation of the air motor.

Abstract: In a pneumatically powered grinding machine provided with a flyweight operated speed governor there is incorporated an independently operating overspeed safety device which in case of malfunction of the speed governor is intended to obstruct further motive air supply to the motor of the machine. The overspeed safety device comprises an annular valve disk having two centrifugal weights which together with a suspender plate form a latch means by which the valve disk is kept in its open position at motor speeds not exceeding a predetermined level. In its open position, the valve disk is elastically bent about a diameter line as a result of the latch engagement between the centrifugal weights and the suspender plate. When the predetermined speed limit is reached, the valve disk is released from the suspender plate to occupy, while resuming its original flat shape, an air supply obstructing, closed position. The safety device is not resettable without dismantling the machine.

Abstract: An overspeed control means for pneumatic tools which includes a split ring valve slidably arranged in a circumferential groove formed in a cage member affixed to the rotor shaft of the tool. When the cage member exceeds a predetermined rotational speed, the ring valve will expand and be moved, by pressure differential acting thereupon, into engagement with a valve seat to block holes in a flow circuit for pneumatic medium being conducted to the rotor of the tool, whereby tool operation is terminated.

Abstract: A pneumatic tool includes a fluid motor with a rotor and passages for connecting the rotor with a source of fluid under pressure. A normally open valve is interposed in the passages and movable to a closed position in which it interrupts the flow of fluid to the rotor. An actuator is located on the rotor and operative, in response to the rotor exceeding a predetermined speed of revolutions, to move from a neutral into an actuating position in which it engages the valve and moves the same to the closed position thereof.

Abstract: A speed sensor is attached to the output shaft of the rotary vane air motor. The speed sensor includes a body member which is pivotally mounted at one end on the output shaft for movement about an axis parallel to the shaft axis. The opposite end of the body member is biased into engagement with a locking pin. So long as the shaft of the air motor does not exceed a threshold speed, the body member remains in the described position. Upon exceeding a threshold speed, the body member disengages from the locking pin due to centrifugal force acting thereon and then engages a movable shutter. In this manner, the shutter is moved by the body member to close air flow passages to the air motor.

Abstract: A governor device for rotary grinders and the like is disclosed. The device prevents the dangerous overspeed of the grinder by throttling air to the motor as the grinder speed approaches overspeed. Throttling action is accomplished by means of allowing a resilient split ring or segment to expand radially out against air inlet orifices by means of centrifugal force. The split ring is assisted outwardly by means of an auxiliary mass means disposed within radially extended slots of an internal cage means.

Abstract: A pneumatic hand tool comprises a housing having a compressed-gas inlet and provided with a pneumatically powered motor which carries on one side a tool holder such as a chuck and on the other side a governor. A speed-control valve is operated by the governor and can close a first air passage between the inlet and the motor to maintain the motor speed below a predetermined limit. Another passage is provided which bypasses the governor-controlled speed-control valve and a valve is provided in this bypass conduit which is openable in order to allow the hand tool to operate at a speed substantially above the governor-established speed.

Abstract: Overspeed safety control mechanism for shutting off operating air flow to the motor of a rotary surface grinding tool when the motor overspeeds beyond a rated governed maximum, including a circular body rotatable with the motor and carrying a ball valve which is adapted to be centrifugally released and entered into a pocket to block flow of operating air to the motor when the latter overspeeds, the speed of the motor being normally controlled by a speed governor.

Abstract: An overspeed shutoff device for use in a rotary pneumatic tool is disclosed. The device is operable to shut off air supply to the motor on failure of its governor to function properly in preventing overspeeding of the motor. The device includes a valve closing plate positioned in the path of air flow to the pneumatic motor, just upstream of an inlet port for passage of air into the motor. In normal operation of the tool the valve plate, which rotates with the motor drive shaft, is retained in a position spaced from the air inlet port by a locking mechanism engaging the drive shaft of the tool to prevent axial movement therealong. The plate locking device comprises a cantilever mounted spring wire in engagement with a groove in the drive shaft and a centrifugally responsive weight operably connected to disengage the wire from the groove in response to the attainment of a predetermined rotary speed.