JP2002531759A - Air motor assembly that can rotate forward and reverse - Google Patents

Abstract

(57) [Summary] Provided is a forward / reverse rotation type pneumatic motor assembly capable of operating a single lever with one hand to rotate, reverse, and accelerate / decelerate an air motor. The forward / reverse valve assembly of the motor includes a tilt valve located in the inlet passage having a valve seat for receiving the valve to shut off the inlet passage. The forward and reverse passages extend from the valve assembly to the motor and operate the motor in forward and reverse directions. A shuttle connected to the lever can move laterally of the motor assembly. The shuttle and tilt valve are mounted to move between a first position, a second position, and a third position at the same time as the actuator is actuated, in which the tilt valve moves relative to the axis away from the valve seat. Tilt, the shuttle is positioned so as to form a continuous path for air to flow from the inlet passage through the shuttle to the forward passage, the motor operates in the forward direction, and in the second position, the tilt valve is Leaning with respect to the axis away from the valve seat, the shuttle is positioned to form a continuous path for air to flow from the inlet passage through the shuttle to the reversing passage, the motor operates in the reverse direction, At three positions, the tilt valve is in close contact with the valve seat to prevent air from flowing from the inlet passage to the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION The present invention relates generally to motors that are operated pneumatically, and more specifically,
The present invention relates to an air motor assembly having a feature of rotating forward and backward.

The present invention is an improvement over the air motor reversing throttle valve shown and described in US Pat. No. 5,432,350, the applicant's prior invention, the disclosure of which is hereby incorporated by reference. Be incorporated. The applicant's prior invention is a single lever (31
) Simply provides pivoting of the air motor by simply pivoting it. Acceleration / deceleration and rotation direction conversion can be operated with one hand, and the motor can be completely stopped. When the lever is pivotally moved in a first direction about the axis, the valve (22) in the valve guide hole (12) of the housing moves, and one of the two valve passages (23 or 29) is moved. To one of the corresponding passages (18 and 30 or 19 and 32) formed in the housing and operate the air motor in a counterclockwise or clockwise direction. In the neutral or stopped position of the valve, there is no fluid communication from the valve to the motor since the valve passage does not overlap any of the corresponding passages. Further, since the lever can be moved to change the amount of overlap of the passage (23 or 29) with the corresponding passage (30 or 32), the motor can be accelerated or decelerated to operate at various speeds only by operating the lever. Can be.

The flow of air to the valve (22) is controlled by a plunger (21). The plunger is biased by a spring so as to be in close contact with a valve seat in order to shut off an air inlet passage from a state of communication with the valve. I have. The plunger mandrel is received in a V-shaped recess on one side of the plunger to release the plunger from its seat and allow air to flow through the valve. When the valve slides laterally, the depression moves relative to the mandrel,
Air flows through the valve as the end of the mandrel is pushed straight (or "vertically") and the plunger separates from the seat. Because the recess is V-shaped, the plunger behaves similarly for movement in either direction of the valve. The applicant's prior air motor reversing throttling valve works well and offers many benefits to the operator, but there is room for improvement. It has been found that the interaction between the V-shaped recess and the plunger mandrel prevents the valve from returning to the stop position. The force of the plunger spring may not be sufficient to move the valve and plunger to stop the motor when the lever is released. In addition, it may be difficult to move the plunger in the axial direction, requiring considerable force on the lever. Applying this force, which is necessary to move the plunger away from its seat, can make it difficult to control the throttle with the lever.

SUMMARY OF THE INVENTION [0004] Among the objects and features of the present invention, the main one is to start by operating a single lever and to rotate in both forward and reverse directions. Provision of a pneumatic forward / reverse motor assembly that can be operated; provision of the motor assembly that can be accelerated / decelerated by the same lever; starting by applying minimal hand force to the lever, and reversing in the forward direction Providing the motor assembly operable to also rotate in the direction; providing the motor assembly which reliably returns to a stop position when the hand is released; providing the motor assembly which is easy to use and low in manufacturing cost. ,.

[0005] Generally, a pneumatic motor assembly that can be rotated forward and backward includes a housing and a motor that can rotate forward and backward inside the housing. The storage section includes an inlet connection section for connecting the motor assembly to a supply source of compressed air, an entrance passage extending inward from the inlet connection section to the storage section, and sending air to the motor to move the motor in the normal rotation direction. A forward passage adapted to communicate with the inlet passage; and a reverse passage adapted to communicate with the inlet passage to send air to the motor and move the motor in the reverse direction. The forward / reverse valve assembly installed between the inlet passage and the forward / reverse passage in the storage section,
By operating the actuator mounted on the storage section, the communication of fluid between the inlet passage and the reversible motor can be selectively controlled, so that the motor can be selectively operated in the normal rotation direction or the reverse rotation direction. The forward / reverse valve assembly comprises a tilt valve located in the inlet passage that can be received in a valve seat in the inlet passage to shut off the inlet passage. The spring biases the valve toward the valve seat. The shuttle is located within the storage compartment and is connected to the actuator for sliding laterally within the storage compartment. The shuttle and the valve are mounted on the storage portion so as to move between the first position, the second position, and the third position at the same time when the actuator is operated,
In its first position, the valve is tilted with respect to the axis away from the valve seat, and the shuttle is installed so that air can continuously flow from the inlet passage through the shuttle to the forward passage to rotate the motor in the forward direction. Activating, in the second position, the valve is tilted relative to the axis away from the valve seat, and the shuttle is installed to continuously flow air from the inlet passage through the shuttle to the reversing passage to rotate the motor in the reverse direction. Let it work,
In the third position, the valve is in close contact with the valve seat to prevent air from flowing from the inlet passage to the motor. Other objects and features of the invention will be in part apparent and in part pointed out hereinafter.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, and in particular to FIGS. 1 and 2, a pneumatic tool constructed in accordance with the principles of the present invention is indicated generally at 10. The tool includes a housing, generally indicated at 12, which has an air inlet connection 14 at one end and an object such as a bolt (not shown) at the other end. ) Are arranged. The storage section 12 is elongated and has a substantially cylindrical shape so that it can be gripped with one hand. The lever 15 is pivotally connected to the storage unit by being connected to a mounting stud 17 fixed to the storage unit 12 in order to start, stop, accelerate, decelerate, and reverse the tool 10 as described later. It is installed. The particular tool shown is the applicant's prior U.S. Provisional Application No. 60 / 109,429, filed November 23, 1998, and the applicant's pending PCT, filed November 23, 1999. Ratchet wrenches described in the application, the disclosures of which are incorporated herein by reference. Hand held pneumatic tool 1
Although zeros are shown, the present invention has broad application to forward and reverse rotating pneumatic motor assemblies, regardless of whether the motor assembly operates on a hand-held tool or any other type of tool. More broadly, the present invention is suitable for a pneumatic motor assembly capable of rotating forward and backward regardless of what the motor assembly is applied to. However, for the purposes of this description, the present invention will be described in terms of a preferred embodiment of the hand-held tool 10.

Referring to FIG. 2, an inlet connection 14 is configured to connect the tool 10 to a source of compressed air (not shown), which may be a conventional air compressor or a compressed air source. It can be a storage unit. An inlet passage, generally indicated at 18, extends inwardly from the inlet connection into the housing 12 to a lateral hole 20 in the housing that receives a portion of the reversing valve assembly (shown generally at 22). . The axially inner portion 24 of the inlet passage is smaller in diameter than the outer portion 26 in the axial direction of the inlet passage so that a shoulder is formed. The collar located at the shoulder forms a valve seat 28 which engages the valve body 30 of the valve (generally designated 32), and the inner portion 24 of the inlet passage 18 and the outer portion 24 when the tool 10 is stopped. Fluid communication between the sections 26 is normally interrupted. The valve 32 further includes a coil spring 34 for biasing the valve body 30 toward the valve seat 28, one end of which engages the housing 12 inside the inlet passage 18; The other end is engaged with the valve body 30. Mandrel 36 extends from valve body 30 to inner portion 24 of the inlet passage and bush 40.
Extending through the oval central hole 38 into the opening 42 of the shuttle 44, which shuttle is received in the bush so as to slide in the bushing substantially laterally of the housing 12. In the illustrated embodiment, the valve 32, bush 40 and shuttle 44 are part of the forward / reverse valve assembly 22.

The cross-section line for FIG. 2 (shown in FIG. 1) has a bend, so that the forward and reverse passages (shown at 46 and 48 respectively) are visible, Otherwise, it would be removed in a straight longitudinal sectional view of the tool 10.
The forward rotation passage 46 and the reverse rotation passage 48 are formed through the lateral holes 20 in the storage portion 12 through the tool 10.
To the air motor 50. Inlet passage 18, forward rotation passage 46 and reverse rotation passage 4
8 is formed into the storage part 12 in the embodiment shown. However, these passages can be configured remote from the storage (e.g., with a pipe or tube) without departing from the scope of the invention. The air motor 50 includes a cylindrical hollow container 52 and a rotating blade 54 installed inside the container. Rotary vane 54 has a shaft (not shown) that extends through each end of the container, and a rotating bearing 56 of the rotary blades in the container (one of which is shown in dashed lines). On). The forward rotation passage 46 and the reverse rotation passage 48 extend through the container and send compressed air to the rotating blades. Sending air through the forward passage 46 causes the device 16 of the tool 10 to rotate forward (i.e., clockwise), and sending air through the reverse passage 48 causes the device to reverse (i.e., counterclockwise). Become. Exhaust gas from the motor 50 passes through a vent hole (not shown) in the container, and an exhaust passage 6 formed in the housing 12.
Flows to zero and leaves the container. These vents are conventional in construction and assembly and will not be described further herein. The exhaust passage 60 extends to an exhaust outlet 62 at the same end as the inlet connection 14 of the tool 10. Further, the exhaust flows to the exhaust passage 60 through one of the forward passage 46 and the reverse passage 46 that is not used to send high pressure air to the motor 50 through the valve assembly 22, which is described below. Describe.

The bush 40 of the valve assembly 22 has a tube shape and is formed to have a rectangular flat surface 64 depressed on the inlet side of the bush (see FIG. 4A).
. First and second axially-spaced inlet ports located in a recessed plane 64 (
(Shown at 66 and 68 respectively) extend through the bush 40 to its hollow interior and open toward the inner portion 24 of the inlet passage 18 so that they are permanently associated with said inlet passage. There is fluid communication. Mandrel 36 of valve 32
The central hole 38 of the bush 40 for receiving the recess is formed with a recessed plane 64 between the two inlet ports.
Is located inside. Relatively large first and second windows (shown at 70 and 72, respectively) are located substantially in front of bush 40 (see FIG. 4B). Since the forward passage 46 in the storage portion 12 is open toward the first window 70 and the reverse passage 48 is open toward the second window 72, the forward passage is permanently connected to the first window. There is liquid communication and the reversing passage is in permanent fluid communication with the second window. The bush 40 has a flat surface 74 on its back surface (see FIG. 4C) so that the bush 40 is spaced from the lateral hole 20 in the housing 12 and extends laterally in communication with the exhaust passage 60. An exhaust supply passage 76 is formed. Due to the first exhaust port 78 and the second exhaust port 80 of the bush 40, there is permanent fluid communication between the inside of the bush and the exhaust supply passage 76. The shuttle 44 in the bush 40 is connected to the entrance port (66 or 6).
8) and which of the exhaust ports (78 or 80) will be operated by air, which is described below.

The shuttle 44 has a cylindrical shape and is received inside the bush 40. The shuttle 44 extends out of the bushing and lateral holes 20 of the compartment 12 and is pivotally connected to the lever 15 by pins 82 at a point away from where the lever is pivotally connected to the compartment. (FIG. 2). The shuttle 44 has an exhaust passage 60
, And the exhaust passage is formed so as to surround the shuttle, so that the exhaust passage is not blocked by the shuttle. Pivoting the lever 15 in a clockwise direction about the mounting pin 17 causes the shuttle 44 to be lowered to a first position where the tool 10 rotates forward (as the tool 10 is shown in FIG. 5),
When the lever is pivoted counterclockwise about the mounting pin, the shuttle is pulled up to the second reverse position (FIG. 6). Mandrel 36 of valve 32
The receiving aperture 42 overlaps the central hole 38 of the bush 40 and the mandrel passes through the central hole to the shuttle opening. Since the inlet portion of the opening 42 is sized to approximate the diameter of the stem 36, the stem substantially seals the opening and moves laterally with respect to the storage as the shuttle 44 moves laterally. Inside the inlet portion of the opening, the opening 42 has a counterbore 84 that is larger than the diameter of the inlet portion. Counterbore 84
Provides space inside the shuttle 44 for the distal end of the mandrel 36 to move within the shuttle (see FIGS. 5 and 6). When the shuttle 44 moves to either the first position (FIG. 5) or the second position (FIG. 6), the valve 32 tilts, the portion of the valve body 30 separates from the valve seat 28, and compressed air flows around the valve body. Passes to the inner portion 24 of the inlet passage 18 to the bush 40 and the shuttle. When the shuttle 44 moves toward the first position, the valve 32 pivots counterclockwise about an axis transverse to the storage section 12 and when the shuttle 44 moves toward the second position, The valve pivots clockwise about the axis. The shuttle 44 further includes a first peripheral channel 86 and an axially spaced second peripheral channel 88 that allow air to pass through the shuttle inside the bush 40 as described below.

Since the structure of the pneumatic tool 10 of the present invention has been described above, its operation will be described below. When not in use, the valve assembly 22 is in the third position as shown in FIG.
That is, the tool 10 is at a neutral position, and the tool 10 is stopped. In this position, the first and second peripheral channels 86, 88 do not overlap the first and second inlet ports 66, 68 in the bush 40. Therefore, the shuttle 44 blocks both entrance ports. Further, the stem 36 of the valve 32 is located substantially parallel to the axis of the storage section 12, and the valve body 30 is completely in contact with the valve seat 28, and the outer portion 26 of the inlet passage 18 is connected to the inner portion 24. To block air from passing through. The coil spring 34 biases the valve assembly 22 into this state, so that when the hand force on the lever 15 is released, the valve assembly automatically moves to this neutral position. Because the end of the mandrel 36 is not engaged with the shuttle 44, the mandrel is not restrained by the shuttle, but can pivot within the shuttle.

As shown in FIG. 5, when the lever 15 is pivoted clockwise to the first position, the valve body 30 is tilted away from the seat, and compressed air flows through the inlet passage 1.
8 to the inner part 24. In the first position, the first peripheral channel 86 of the shuttle 44 overlaps the inlet port of the bush 40. Since the first channel 86 always overlaps the first window 70 of the bush 40, in the first position, air flows through the first inlet port 66 to the bush and passes through the first channel to the shuttle 44.
And exits the bush, passes through the first window and into the forward passage 46, which is illustrated in FIG. Therefore, at the first position, there is a continuous path from the first inlet port 66 to the normal rotation passage 46. The first channel 86 is the first inlet port 6
Acceleration / deceleration can be performed by moving the lever 15 so as to change the amount of overlap with 6.
Thus, the operator can control the speed of the motor 50 with the lever 15. Since the first channel 86 does not overlap with the first exhaust port 78, it is blocked by the shuttle 44. In the first position, the second channel 88 of the shuttle 44 does not overlap the second inlet port 68 and the port is shut off by the shuttle,
Compressed air cannot flow through the shuttle to the reversing passage 48. But,
In the first position of the shuttle 44, the second channel 88 is connected to the second exhaust port 80 (FIG. 5).
(Shown by a dotted line) and the second window 72. Therefore, the exhaust gas passes through the second window 72 from the motor 50 through the reverse passage 48 along the continuous path, and
Around the shuttle 44 through a channel 88, it may pass from the second exhaust port 80 to the exhaust supply passage 76 (FIG. 8). The exhaust supply passage sends exhaust gas to the exhaust passage 60 in a lateral direction of the storage unit 12.

When the lever 15 is pivoted counterclockwise, the shuttle 44 moves to the second position. Since the tilt valve 32 is pivoted clockwise so that the valve body 30 moves away from the seat, the compressed air is again applied to the inner portion 2 of the inlet passage 18.
Pass to 4. In the second position, as shown in FIG. 6, the first peripheral channel 86 of the shuttle 44 does not overlap the first inlet port 66, so the first inlet port is blocked by the shuttle. However, because the second peripheral channel 88 overlaps the second inlet port 68 and the second window, the compressed air passes through the second inlet port, passes around the shuttle 44 through the second channel, and exits the second window. Reversing passage 48
To reverse the motor. The second channel 88 does not overlap the second exhaust port 80, so that the air flowing from the inside of the bush 40 to the exhaust supply passage 76 is blocked by the shuttle 44. Because the first channel 86 overlaps the first exhaust port 78 and the first window, exhaust from the motor 50 passes through the first window, passes around the shuttle 44 through the first channel, exits the valve assembly 22 and exits the valve assembly 22. It flows to the exhaust supply passage 76 through one exhaust port. Thus, the reverse operation of the motor 50 is performed.

In view of the above, several objects of the invention are realized and other advantages are enjoyed. In introducing elements of the present invention, or preferred embodiments, articles such as "a, an, the" and "said" are intended to include one or more elements. . Also, “comprising” and “including” (includin
g), "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.

[0015] Various changes may be made in the above arrangement without departing from the scope of the present invention, and all content contained in the above description and accompanying drawings is for explanation, It is to be understood that this is not a limitation. Corresponding reference numerals indicate corresponding parts throughout the several views.

[Brief description of the drawings]

FIG. 1 is a front view of a pneumatic tool of the present invention.

FIG. 2 is a partial longitudinal sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a partial perspective view of the tool with the valve assembly of the tool partially disassembled from a housing.

FIG. 4A is a right side view of a bush of the valve assembly.

FIG. 4B is a front view of the bush.

FIG. 4C is a rear view of the bush.

FIG. 5 is an enlarged partial sectional view extracted from FIG. 2 and showing a state in which the valve assembly operates in a normal rotation.

FIG. 6 is an enlarged cross-sectional view similar to FIG. 5, illustrating a state where the valve assembly operates in reverse rotation.

FIG. 7 is a cross-sectional view taken along a plane including line 7-7 in FIG.

8 is a cross-sectional view taken along a plane including line 8-8 in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Tool, 12 ... Storage part, 14 ... Entry connection part, 15 ... Lever, 16 ... Device
17 mounting pin, 18 inlet passage, 20 hole, 21 plunger, 24 inner part, 26 outer part, 28 valve seat, 30 valve body, 32 valve
34 coil spring, 36 mandrel, 38 central hole, 40 bush, 42 opening, 44 shuttle, 46 forward rotation passage, 48 reverse rotation passage, 50 motor, 52 container, 54 rotating blade , 56 ... rotary bearing, 60 ... exhaust passage, 62 ... exhaust outlet, 64
... plane, 66 ... first entrance part, 68 ... second entrance part, 70 ... window, 72 ... window, 74
... plane, 76 ... exhaust supply passage, 78 ... first exhaust port, 80 ... second exhaust port,
82 pin, 84 counterbore, 86 first peripheral channel, 88 second peripheral channel.

[Procedure amendment]

[Submission date] June 21, 2001 (2001.6.21)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

The present invention is an improvement on the air motor reversing throttle valve shown and described in US Pat. No. 5,423,350, the applicant's earlier invention, the disclosure of which is hereby incorporated by reference. Be incorporated. The applicant's prior invention is a single lever (31
) Simply provides pivoting of the air motor by simply pivoting it. Acceleration / deceleration and rotation direction conversion can be operated with one hand, and the motor can be completely stopped. When the lever is pivotally moved in a first direction about the axis, the valve (22) in the valve guide hole (12) of the housing moves, and one of the two valve passages (23 or 29) is moved. To one of the corresponding passages (18 and 30 or 19 and 32) formed in the housing and operate the air motor in a counterclockwise or clockwise direction. In the neutral or stopped position of the valve, there is no fluid communication from the valve to the motor since the valve passage does not overlap any of the corresponding passages. Further, since the lever can be moved to change the amount of overlap of the passage (23 or 29) with the corresponding passage (30 or 32), the motor can be accelerated or decelerated to operate at various speeds only by operating the lever. Can be.

────────────────────────────────────────────────── ─── [Continued Summary] The tilting valve is in close contact with the valve seat to operate in the reverse direction and prevent air from flowing from the inlet passage to the motor in the third position.

Claims (11)

[Claims] An air motor assembly rotatable forward and backward, comprising an inlet connection for connecting the motor assembly to a source of compressed air, and an inlet passage extending inward from the inlet connection to a housing. A forward passage formed to communicate with the inlet passage to send air to the motor and move the motor in the forward direction; and the inlet to send air to the motor and move the motor in the reverse direction. A forward / reverse rotatable motor in the housing further including a reverse passage formed to communicate with the passage; and selectively communicating fluid between the inlet passage and the forward / reverse rotatable motor. A forward / reverse rotation valve assembly installed between the inlet passage and the forward and reverse rotation passages in the storage section to selectively control the motor in a forward rotation direction or a reverse rotation direction. Actuating the valve assembly in order to create, made, and an actuator mounted on the housing part, the forward-reverse valve assembly is inclined valve disposed in said inlet passage,
A valve seat disposed within the housing and connected to the actuator for sliding across the housing, wherein the inlet passage receives the tilt valve to shut off the inlet passage; and A spring for biasing a valve toward a valve seat, wherein the shuttle and the tilt valve are moved to the first position, the second position, and the third position by the operation of the actuator; Mounted, in its first position, the tilt valve tilts with respect to the axis of the valve seat, and the shuttle forms a continuous path for air to flow from the inlet passage through the shuttle to the forward passage. The motor operates in the normal rotation direction, the tilt valve is tilted with respect to the axis of the valve seat in the second position, A shuttle is positioned to form a continuous path for air to flow from the inlet passage through the shuttle to the reversing passage, the motor operating in a reverse direction, and in the third position, the air passing through the inlet passage. A forward / reverse rotatable air motor assembly in which the tilt valve is in close contact with the valve seat to prevent flow from the motor to the motor. 2. The shuttle and tilt valve are operably connected to tilt the tilt valve with respect to an axis when the shuttle slides laterally between the first and second positions. The reciprocally rotatable air motor assembly according to claim 1, wherein: 3. The reversibly rotatable air motor assembly of claim 2, wherein the tilt valve includes a valve stem extending from the tilt valve and received by the shuttle. 4. The shuttle includes an opening for receiving a distal portion of the tilt valve mandrel, the tilt valve mandrel being closely spaced at the opening from the shuttle. An air motor assembly capable of rotating forward and backward according to claim 3. 5. The pneumatic motor assembly as claimed in claim 4, wherein an axial end portion of the tilt valve stem is not in contact with the shuttle. 6. The end bobber is widened with a counterbore to have a diameter substantially greater than the diameter of the mandrel, and the distal portion of the mandrel is movable within the shuttle relative to the shuttle. Item 6. An air motor assembly capable of rotating forward and reverse according to Item 5. 7. The device of claim 6, wherein the valve assembly further includes a bush in the housing for receiving the shuttle for movement between the first position and the second position. Possible air motor assembly. 8. The shuttle is generally cylindrical and has first and second axially spaced peripheral channels formed in the shuttle to allow air to pass through the shuttle, the bushing comprising: First and second axially spaced inlet ports in fluid communication with the inlet passage, a first window in communication with the forward passage, and a second window in communication with the reverse passage. Wherein, in a first position of the shuttle, air flows from the inlet passage to the forward passage since a first peripheral channel of the shuttle is in fluid communication with the first inlet port and the first window. The shuttle shuts off the second inlet port in a first position, and in the second position of the shuttle, the second peripheral channel is in fluid communication with the second inlet port and the second window, Reverse from the entrance passage The forward / reverse rotatable air motor assembly according to claim 7, wherein air flows to the diversion passage. 9. The storage unit further includes an exhaust passage for receiving exhaust from the motor and discharging the exhaust out of the storage unit, and the bush further has fluid communication with the exhaust passage. A first position of the shuttle, wherein a second peripheral channel of the shuttle includes the second window and the second exhaust port;
Due to the fluid communication with the exhaust port, a continuous exhaust passage from the reverse passage to the exhaust passage is formed, the shuttle shuts off the first exhaust port in the first position, and the second In the position, the first peripheral channel of the shuttle is in fluid communication with the first window and the first exhaust port, so that a continuous exhaust passage from the forward passage to the exhaust passage is formed, 9. The reversibly rotatable air motor assembly according to claim 8, wherein said second position shuts off said second exhaust port. 10. The shuttle comprises a lever mounted on the housing for pivoting about an axis, the shuttle rotating the motor forward when pivoted in a first direction. 2. The shuttle moves to the first position, and pivoting the actuator in a second direction opposite to the first direction, the shuttle moves to the second position to reverse the motor.
A pneumatic motor assembly capable of rotating forward and reverse. 11. The apparatus according to claim 11, further comprising a device attached to the housing at an end opposite to the end at which the inlet connection is arranged, the device being used for transmitting rotation to an object. Item 2. An air motor assembly capable of rotating forward and reverse according to Item 1.