Speed responsive centrifugal governor

Claim 2

A pneumatic tool including an air driven rotary motor, an air feed port for conducting operating air to tHe motor, a governor controlled slide valve axially aligned with the port and movable toward and away from the port, and speed responsive centrifugal governor means coupled to the motor for governing the directional movement of the valve; wherein the valve has a free end axially cooperable with the port to restrict air flow from the port to the motor, the valve has a recess in its bottom end, means rotatable with the motor for guiding the valve in its directional movement is received into the recess, and a passage leading through said free end of the valve connects axially with the recess for conducting a stream of air flowing from the port to the recess, the guiding means blocking escape of the air from a bottom end of the recess; wherein a spring biases the valve axially away from the port to a normally open condition; wherein the governor means includes centrifugally actuable weights having foot portions underlying the bottom end of the valve; and wherein the motor has a rotor shaft end, the governor means includes a cylindrical body of cup-form having a bottom wall attached to the shaft end and having a side wall disposed in coaxial spaced surrounding relation to the valve, and a ring slidably received in the cup of the body has an inner diameter wall slidably collaring the valve.

Claim 3

A pneumatic tool as in claim 1, wherein the valve has a peripheral flange resting upon the foot portions of the weights, the spring surrounds the valve in abutting relation at one end with the ring and in abutting relation at its opposite end with the flange, and abutment means fixed in the body of the governor means overlies the ring.

Claim 4

A pneumatic tool as in claim 2, wherein the governor means is disposed in a chamber for relative rotation, with which chamber the port has communication, openings are provided in the body of the governor means, and the spring has a clearance between it and the main body of the valve permitting live air circulating from the port through the chamber and openings to flow in the clearance about the main body of the valve.

Claim 5

In a pneumatic tool including an air driven rotary motor and an inlet port for conducting operating air to the motor, the improvement comprising: a governor controlled slide valve having a substantially solid body axially aligned with the inlet port, a spring externally of the valve biasing it away from the inlet port to a normally open condition, a governor body coupled for rotation with the motor having centrifugally operable flyweights for moving the valve against the bias of the spring toward the inlet port, a restricted port extending axially through a top end of the valve communicating with a cylindrical recess axially of the bottom end of the valve for obtaining a balance of pneumatic pressure at opposite end areas of the valve, a bolt having a shank threadedly coupling the governor body to the motor and having a relatively short cylindrical head projecting with a slide fit into the recess for guiding the valve at its lower end in its axial movement relative to the inlet port, the recess having an axial depth slightly greater than the axial dimension of the bolt head, and a ring having rotation with the governor body slidably collaring the upper end of the valve for guiding the valve at its upper end in its axial movement and for cleaning the surface of the valve as the valve moves relative to the ring.

Claim 6

In a pneumatic tool including an air driven rotary motor and an inlet port for conducting operating air to the motor, the improvement comprising: a governor controlled slide valve having a substantially solid body axially aligned with the inlet port, a spring externally of the valve biasing it away from the inlet port to a normally open condition, a governor body coupled for rotation with the motor having centrifugally operable flyweights for moving the valve against the bias of the spring toward the inlet port, a restricted port extending axially through a top end of the valve communicating with a cylindrical recess axially of the bottom end of the valve for obtaining a balance of pneumatic pressure at opposite end areas of the valve, a bolt having a shank threadedly coupling the governor body to the motor and having a relatively short cylindrical head projecting with a slide fit into the recess for guiding the valve at its lower end in its axial movement relative to the inlet port, the recess having an axial depth slightly greater than the axial dimension of the bolt head, and a ring having rotation with the governor body slidably collaring the upper end of the valve for guiding the valve at its upper end in its axial movement and for cleaning the surface of the valve as the valve moves relative to the ring.

Claim 7

In a pneumatic tool as in claim 4, wherein the valve has a main cylindrical body portion which the ring slidably collars, and has a coned top end the minor diameter of which is enterable into the inlet port and the major diameter of which is greater than that of the inlet port so as to be seatable over the latter during axial movement of the valve.

Claim 8

In combination with a pneumatic tool having an air feed port opening axially through a valve seat into an inlet chamber and having axially aligned with the port the rotor shaft of an air motor operating in a rotor cylinder with which the inlet chamber connects, a cylindRical substantially solid slide valve disposed in axial alignment between the rotor shaft and the valve seat, a spring surrounding the valve biasing it away from the seat to a normally open position, a centrifugal governor having a body fixed to the rotor shaft and carrying centrifugally operable flyweights having cooperation with the valve for moving the valve toward the valve seat against the bias of the spring, a cylindrical recess axially of the bottom end of the valve from which axially extends a restricted passage through a top end of the valve for obtaining a balancing of pneumatic pressures at opposite end areas of the valve, a bolt having a shank threadedly fixing the body of the governor to the rotor shaft formed with a relatively short cylindrical head slidably received in the recess as a closure to the recess and for guiding the valve at its lower end in its axial movement, the recess being only slightly greater in its axial dimension than the axial dimension of the bolt head, the valve having a tapered end engageable with the valve seat, and the axial distance over which the valve is movable from its normal position to its seating position being less than the axial dimension of the bolt head so that the valve never leaves the bolt head during its movement.

Claim 9

In combination with a pneumatic tool having an air feed port opening axially through a valve seat into an inlet chamber and having axially aligned with the port the rotor shaft of an air motor operating in a rotor cylinder with which the inlet chamber connects, a cylindRical substantially solid slide valve disposed in axial alignment between the rotor shaft and the valve seat, a spring surrounding the valve biasing it away from the seat to a normally open position, a centrifugal governor having a body fixed to the rotor shaft and carrying centrifugally operable flyweights having cooperation with the valve for moving the valve toward the valve seat against the bias of the spring, a cylindrical recess axially of the bottom end of the valve from which axially extends a restricted passage through a top end of the valve for obtaining a balancing of pneumatic pressures at opposite end areas of the valve, a bolt having a shank threadedly fixing the body of the governor to the rotor shaft formed with a relatively short cylindrical head slidably received in the recess as a closure to the recess and for guiding the valve at its lower end in its axial movement, the recess being only slightly greater in its axial dimension than the axial dimension of the bolt head, the valve having a tapered end engageable with the valve seat, and the axial distance over which the valve is movable from its normal position to its seating position being less than the axial dimension of the bolt head so that the valve never leaves the bolt head during its movement.

Claim 10

The combination as in claim 6, wherein a ring rotatable with the body of the governor slidably collars the upper end of the valve just below the taper for cleaning the surface of the valve and for guiding the valve at its upper end during relative axial movement of the valve.

Claim 11

A speed responsive centrifugal governor controlled valve assembly comprising a slide valve, a governor body having a cylindrical side wall in surrounding coaxial spaced relation to the valve and having a mounting wall, centrifugally operable flyweights carried by the governor body having foot portions underlying a bottom end of the valve for sliding the valve outwardly of the governor body, a cylindrical recess provided axially of the bottom end of the valve connected with a relatively restricted passage opening axially through a top end of the valve, a spring surrounding the valve in spaced relation to the side wall of the governor body biasing the valve inwardly of the governor body upon the foot portions of the flyweights; and axially spaced means for guiding the valve in its movement axially of the governor body comprising a ring fitted in the interior of the governor body slidably collaring the valve adjacent its upper end, and bolt means for fixing the mounting wall of the governor body to a rotor shaft, the bolt means having a cylindrical head projecting axially above the mounting wall and slidably received in the cylindrical recess.

Claim 12

A speed responsive centrifugal governor controlled valve assembly comprising a slide valve, a governor body having a cylindrical side wall in surrounding coaxial spaced relation to the valve and having a mounting wall, centrifugally operable flyweights carried by the governor body having foot portions underlying a bottom end of the valve for sliding the valve outwardly of the governor body, a cylindrical recess provided axially of the bottom end of the valve connected with a relatively restricted passage opening axially through a top end of the valve, a spring surrounding the valve in spaced relation to the side wall of the governor body biasing the valve inwardly of the governor body upon the foot portions of the flyweights; and axially spaced means for guiding the valve in its movement axially of the governor body comprising a ring fitted in the interior of the governor body slidably collaring the valve adjacent its upper end, and bolt means for fixing the mounting wall of the governor body to a rotor shaft, the bolt means having a cylindrical head projecting axially above the mounting wall and slidably received in the cylindrical recess.

Claim 13

A speed responsive centrifugal governor controlled valve assembly as in claim 8, wherein the valve comprises a uniform cylindrical body which the ring collars, a radial flange terminating the bottom end of the body which rests under the bias of the spring upon the foot portions of the flyweights, and a taper terminating the top end of the body, the surface area of the taper corresponding substantially to that of a back wall of the cylindrical recess.

Claim 14

In a speed responsive centrifugal governor assembly adapted for attachment axially thereof to a rotor shaft, including a cylindrical tubular body open at its top end and having a bottom wall end adapted axially thereof to be clamped to a rotor shaft, a cylindrical slide valve disposed axially of the interior of the body, a spring arranged coaxially between the valve and a surrounding wall of the body biasing the valve axially inwardly of the body, centrifugally operable flyweights carried by the body for moving the valve axially outwardly of the body against the bias of the spring, and a headed bolt for rigidly clamping the bottom wall end of the body axially to a rotor shaft, wherein the valve has a substantially solid cylindrical body comprising a main elongated portion terminating at its bottom end in a radial flange abutting under biaS of the spring upon the flyweights, a taper terminating its top end adapted for seating engagement with a live air supply port, and a restricted passage extending through the top end of the valve connected with a cylindrical recess in the bottom end of the valve for obtaining balanced pneumatic pressures at opposite ends of the valve, and the bolt having a cylindrical head slidably received in the recess for guiding the valve in its axial movement.

Claim 15

In a speed responsive centrifugal governor assembly adapted for attachment axially thereof to a rotor shaft, including a cylindrical tubular body open at its top end and having a bottom wall end adapted axially thereof to be clamped to a rotor shaft, a cylindrical slide valve disposed axially of the interior of the body, a spring arranged coaxially between the valve and a surrounding wall of the body biasing the valve axially inwardly of the body, centrifugally operable flyweights carried by the body for moving the valve axially outwardly of the body against the bias of the spring, and a headed bolt for rigidly clamping the bottom wall end of the body axially to a rotor shaft, wherein the valve has a substantially solid cylindrical body comprising a main elongated portion terminating at its bottom end in a radial flange abutting under biaS of the spring upon the flyweights, a taper terminating its top end adapted for seating engagement with a live air supply port, and a restricted passage extending through the top end of the valve connected with a cylindrical recess in the bottom end of the valve for obtaining balanced pneumatic pressures at opposite ends of the valve, and the bolt having a cylindrical head slidably received in the recess for guiding the valve in its axial movement.