TWI677411B - Pneumatic tools - Google Patents

Abstract

An object of the present invention is to provide a pneumatic tool in which an operator can easily recognize a state where an open valve position is in an open position and switch a valve position in a neutral position. The solution is: the belt-type grinding tool (100) is provided with: an air motor (112) capable of forward rotation and reverse rotation; an on-off valve (126) for opening and closing the air supply path (144); and an air supply path (144) Switching valve (124). When the switching valve (124) is in a neutral position between the forward rotation position and the reverse rotation position, the first and second branched air supply passages (154, 156) are communicated to the air supply passage (144), and the first and second The two branch air supply passages (154, 156) communicate with the exhaust passage. Compressed air passes from the air supply passage (144) to the first and second branched air supply passages (154, 156), and then passes from the air supply ports of the first and second motors of the air motor (112) through the air motor (112). Reach the exhaust passage, or reach the exhaust passage without passing through the air motor (112), and then discharge to the outside. With the exhaust at this time, an exhaust sound is generated.

Description

Pneumatic tools

The present invention relates to a pneumatic tool provided with an air motor, and more specifically, to a pneumatic tool capable of switching the rotation direction of the air motor between forward rotation and reverse rotation.

It is known that a pneumatic tool such as a torque wrench or a belt-type grinding tool provided with an air motor can switch the air supply path for supplying compressed air to the air motor and switch the rotation direction of the air motor between forward rotation and reverse rotation. The direction of rotation of the belt. In this type of pneumatic tool, usually, the air motor has two air supply ports, and the air supply path extending from the air supply port connected to the external compressed air supply source is divided on the way and extends to the two air supply ports of the air motor, respectively. In addition, a switching valve for switching a flow path at a branch portion of the air supply path is provided. The switching valve can be displaced between the forward rotation position and the reverse rotation position. If the switching valve is set to the forward rotation position, the air supply path communicates with one branch air supply path, so that compressed air is supplied to the air motor from one air supply port. , So that the air motor will rotate forward. When the switching valve is set to the reverse position, the air supply path communicates with the branched air supply path of the other side, so that the compressed air is supplied from the other air supply port to the air motor, thereby the air motor is reversed. In addition to the switching valve described above, an on-off valve is provided to open and close the air supply path. When the on-off valve is moved to the open position, compressed air from an external compressed air supply source is supplied to the air supply path, and the air motor The direction is driven by the direction set by the switching valve. (Patent Literature 1, 2) [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 2-145971 平 [Patent Document 2] Japanese Patent Laid-Open No. 2005-28533 [Patent Document 3] Japanese Shiko Sho 48-43670

[Problems to be Solved by the Invention]

In the pneumatic tool that can switch the rotation direction, if the switching valve is set to the neutral position between the forward rotation position and the reverse rotation position, the air supply path is not connected to any branch air supply path. Therefore, regardless of the state of the on-off valve, compression No air flows from the switching valve to the front and is not supplied to the air motor, so the air motor does not rotate. Therefore, when the on-off valve is operated without noticing that the switching valve position is in the neutral position, the pneumatic motor will not be driven, and the pneumatic tool will not cause any changes. Therefore, some operators mistakenly believe that the pneumatic tool is faulty or that compressed air is not supplied to the pneumatic tool. Fear. Further, when the pneumatic tools of Patent Documents 1 and 2 are like the pneumatic tools of Patent Document 3, when the ring-shaped operating member for operating the on-off valve is held at the driving position where the on-off valve is set to the open position, the valve position is switched. When the pneumatic tool stopped in the neutral position and the open / close valve position is in the open position, in order to set the driving direction of the air motor, when the switching valve is operated to the forward or reverse position, the air motor is accidentally driven to cause an accident. Fear.

Therefore, an object of the present invention is to provide a pneumatic tool in which an operator can easily recognize a state in which an on-off valve position is in an open position and switch a valve position in an intermediate position. [Solutions for solving problems]

That is, the present invention is a pneumatic tool including an air motor. The air motor has a first motor air supply port and a second motor air supply port. When compressed air is supplied from the first motor air supply port, The second motor air supply port is reversed when compressed air is supplied, and the pneumatic tool is provided with: an air supply port connected to an external compressed air supply source; 气 an air supply path extending from the air supply port; the first air motor's first air motor The first branched air supply path of the motor air supply port; the second branched air supply path extending to the second motor air supply port of the air motor; an exhaust path for exhausting compressed air to the outside; arranged in the air supply port On the way of the passage, an on-off valve that can be displaced between an open position that opens the air supply path and a closed position that closes the air supply path; An operating member that is displaced between a driving position of the opening position and a stopping position of the opening and closing valve in the closed position; and Between the air passage and the first and second branched air supply passages, the first branched air supply passage can be connected to the air supply passage to block the forward rotation position of the second branched air supply passage, and to the air supply passage. A neutral position where the air passage communicates the first and second branched air supply passages and a reverse position where the first supply air passage is blocked by the air supply passage and the reversed position communicates the second branched air supply passage When the switching valve is in the open position and the switching valve is in the neutral position, the compressed air supplied from the air supply port reaches the first and second branched air supply paths from the air supply path. When the air motor is actually rotated, it is discharged through the exhaust passage.

In this pneumatic tool, when the open / close valve position is in the open position and the switching valve position is in the neutral position, compressed air is exhausted through the exhaust passage, whereby exhaust sound is generated. With this exhaust sound, the operator can easily recognize that the switching valve position is in a neutral state and the on-off valve becomes the open position.

Specifically, when the switching valve position is in the neutral position, the first and second branched air supply passages are communicated to the exhaust path, and when the switching valve position is in the open position and the switching valve position is in the neutral position. At least a portion of the compressed air reaching the first and second branched air supply paths from the air supply path flows from the first and second branched air supply paths to the exhaust path without passing through the air motor.

Instead of or including the above, the air motor is a cylindrical motor chamber having a circular cross section and a wheel motor provided with a rotor rotatable in the motor chamber, and has a motor exhaust port for exhausting the motor. The ports are located at approximately equal distances in the circumferential direction from the first and second motor air supply ports which are adjacent to each other and open in the motor chamber, and communicate with the exhaust passage. The on-off valve position is in the open position and When the switching valve position is in the neutral position, at least a part of the compressed air reaching the first and second branched air supply passages from the air supply passage enters the motor chamber from the first and second motor air supply openings, respectively, Then, they flow in opposite directions along the circumference of the rotor to reach the motor exhaust port, and then flow to the exhaust path.

Further, the operation member may be held in the driving position.

In particular, when the operating member is held in the driving position, the pneumatic tool is stopped while the switching valve is maintained in the neutral position and the on-off valve is maintained in the open position. In order to use the pneumatic tool, there is care when operating the switching valve It is possible to drive the air motor, but the operator can easily recognize that the on-off valve becomes the open position in the air tool by the exhaust sound, so that the air motor can be prevented from being driven inadvertently.

Preferably, it comprises: (1) a first body portion provided with the air motor and the switching valve; and a second body portion provided with the on-off valve and the operating member and mounted so as to be rotatable relative to the first body portion; One of the main body portion and the second main body portion has a first locking portion, and the other has a plurality of second locking portions that fit into the first locking portion. The second body portion is opposite to the first locking portion. When the 1 main body portion is rotated, the first locking portion is fitted into any one of the plurality of second locking portions in a plurality of relative rotation positions, and the second main body portion is held relative to the first main body portion. Position in the direction of rotation.

With this structure, the position in the circumferential direction of the operating member can be arbitrarily changed. Therefore, when the hand or the direction of holding the pneumatic tool is changed in accordance with the work content, the position of the operating member can also be changed accordingly to enable the operation. Sexual improvement.

Preferably, the operation member is a handle that is pivotably mounted on the second body portion, and may further include a handle fixing member that prevents the handle from being displaced to the driving position.

With this structure, it is possible to prevent the air motor from being driven by accidentally displacing the handle to the driving position when the second body portion is rotated.

Hereinafter, embodiments of the pneumatic tool according to the present invention will be described based on the attached drawings.

The pneumatic tool according to the first embodiment of the present invention is a belt-type grinding tool 100. As shown in FIGS. 1 to 3, the pneumatic tool includes a tool body 110 including an air motor 112, and a drive mounted on a drive shaft 114 of the air motor 112. A pulley 116; a pulley support rod 118 which is movably mounted in the front-rear direction with respect to the tool body 110; and an idler pulley 120 which is rotatably mounted at a front end portion of the pulley support rod 118. The belt-type grinding tool 100 is driven by an air motor 112, and the endless grinding belt 122 suspended between the driving pulley 116 and the idle pulley 120 is rotationally driven. As described below, the belt-type polishing tool 100 can change the driving direction of the air motor 112 by changing the valve 124 to change the direction of rotation of the endless polishing belt 122, and can control the supply by opening and closing the on-off valve 126. The compressed air of the air motor 112 drives and stops the air motor 112.

The air motor 112 is a vane motor. As shown in FIG. 4 and FIG. 5, the motor has a motor housing 130 defining a circular cylindrical motor chamber 128 in a circular cross-section; and a rotor 132 rotatably disposed in the motor chamber 128; And a plurality of blades 134 that are displaceable in the diameter direction with respect to the rotor 132. As shown in FIG. 4, the motor housing 130 is provided with a first motor air supply port 136 and a second motor air supply port 138 that are adjacent to each other and open toward the motor chamber 128. The motor air supply port 136 and the second motor air supply port 138 are provided with a motor exhaust port 140 at a position substantially equal to the circumferential direction.

As shown in FIG. 3, the tool body 110 is formed with an air supply passage 144 extending from an air supply port 142 connected to an external compressed air source (not shown), and is arranged in the middle of the air supply passage 144 to supply air. The on-off valve 126 which the passage 144 opens and closes. The on-off valve 126 is urged to the closed position to close the air supply path 144 by the spring 146, and is displaced to open the air supply path by pressing the operating shaft 148 extending to the outside of the tool body 110 against the elastic pressure of the spring 146. 144 open position. The tool body 110 further includes an operation ring (operation member) 150 for opening and closing the on-off valve 126. The operation ring 150 is restricted from rotating in the circumferential direction at the position shown in the figure, and if it is displaced forward (to the left according to the figure) against the elastic pressure of the spring 152, it can be rotated in the circumferential direction. When the operation ring 150 is displaced forward and rotated in the circumferential direction, the sliding inner peripheral surface 150a of the operation ring 150 is cam-engaged with the operation shaft 148 of the on-off valve 126 and presses the operation shaft 148 toward the inside in the diameter direction. 126 moves to the open position. By operating the operation ring 150 from the stop position in which the on-off valve 126 becomes the closed position to the drive position in which the on-off valve 126 becomes the open position, the air supply passage 144 can be opened. In addition, the operation ring 150 can be maintained in the original position even if the hand is moved away at an arbitrary rotation position. Therefore, the operation ring 150 can be maintained in the original position even in the driving position. Therefore, it is not necessary to drive the belt grinding tool 100. During this time, the operation ring 150 is continuously held by the hand.

Further, as shown in FIG. 4, the tool body 110 is formed with a first branch air supply path 154 extending to the first motor air supply port 136 of the air motor 112 and a second motor air supply port extending to the air motor 112. The second branched air supply path 156 of 138 is provided with a switching valve 124 between the air supply path 144 and the first and second branched air supply paths 154 and 156. The switching valve 124 is rotatably disposed in a cylindrical valve housing 158. The switching valve 124 has an operation knob 160 (FIGS. 2 and 3) located outside the tool body 110. By operating the operation knob 160, the switching valve 124 can be moved from the forward rotation position in FIG. 6A to the neutral position in FIG. 6B. Further, it is shifted to the reverse position of FIG. 6C. When the switching valve 124 is in the forward rotation position (FIG. 6A), the first branched air supply path 154 is connected to the air supply path 144 via the air supply communication path 162 of the switch valve 124, and the second branched air supply path 156 is Interrupted. Therefore, the compressed air supplied from the air supply path 144 is supplied from the first motor air supply port 136 to the motor chamber 128 of the air motor 112 through the first branch air supply path 154, and the rotor 132 is rotated forward (FIG. 4 shows Rotate counterclockwise). When the switching valve 124 is in the reverse position (FIG. 6C), the first branched air supply path 154 is blocked and the second branched air supply path 156 is connected to the air supply path 144 via the air supply communication path 162. Therefore, the compressed air supplied from the air supply path 144 is supplied from the second motor air supply port 138 into the motor chamber 128 of the air motor 112 through the second branch air supply path 156, and the rotor 132 is reversed (FIG. 4 shows the Rotate clockwise). When the switching valve 124 is in the neutral position (FIG. 6B), the first branched air supply path 154 and the second branched air supply path 156 are simultaneously connected to the air supply path 144 via the air supply communication path 162. At this time, as described below, the compressed air supplied from the air supply port 142 reaches the first branched air supply path 154 and the second branched air supply path 156, and the belt-type grinding tool 100 is not rotated substantially by the air motor 112. exhaust.

An exhaust path 164 is formed in the tool body 110 to finally discharge the compressed air supplied from the air supply port 142 to the outside. The exhaust passage 164 is, as shown in FIG. 5, provided with a first annular portion 164 a extending from the motor exhaust port 140 of the air motor 112 to the periphery of the motor housing 130, and a first annular portion extending from the first portion 164 a to the rear. The second portion 164b and the third portion 164c in a ring shape connected to the second portion 164b. The exhaust passage 164 is also shown in FIG. 3, and includes a fourth portion 164d extending from the exhaust communication passage 166 of the switching valve 124 to the third portion 164c, and a rearward extension from the third portion 164c to the exhaust port. Part 164e of 168 (shown in dashed lines in FIG. 3).

When the switching valve 124 is in the forward rotation position (FIG. 6A), and the operation ring 150 is set to the driving position and the on-off valve 126 is set to the open position, the compression is supplied from an external compressed air supply source to the air supply port 142. The air reaches the switching valve 124 through the opened air supply passage 144. Compressed air is supplied through the first branch air supply path 154 communicated through the air supply communication path 162 of the switching valve 124 from the first motor air supply port 136 to the motor chamber 128 of the air motor 112, and then the rotor 132 is rotated forward . Part of the compressed air that rotates the rotor 132 is discharged from the air motor 112 through the motor exhaust port 140, and the remaining compressed air is discharged from the air motor 112 through the second motor air supply port 138. The compressed air discharged from the air motor 112 through the motor exhaust port 140 passes through the first portion 164a, the second portion 164b, the third portion 164c, and the fifth portion 164e of the exhaust passage 164 in sequence, and finally passes through the exhaust port 168 is discharged towards the outside. On the other hand, the compressed air discharged from the air motor 112 through the second motor air supply port 138 passes through the second branched air supply path 156 and passes through the second exhaust path 164 through the exhaust communication path 166 of the switching valve 124. The four portions 164d, and the third portion 164c and the fifth portion 164e of the exhaust passage 164 are finally discharged from the exhaust port 168.

When the switching valve 124 is in the reverse position (FIG. 6C), when the operating ring 150 is set to the driving position and the on-off valve 126 is set to the open position, compressed air flows from the air supply passage 144 through the supply through the switching valve 124. The second branched air supply path 156 communicated with the air communication path 162 is supplied from the second motor air supply port 138 into the motor chamber 128 of the air motor 112, and then the rotor 132 is reversed. Part of the compressed air that rotates the rotor 132 is discharged from the air motor 112 through the motor exhaust port 140 and is discharged through the exhaust passage 164 in the same manner as in the normal rotation. The remaining compressed air is exhausted from the air motor 112 through the first motor air supply port 136, and then passes through the first branched air supply path 154, and then through the first exhaust path 164 connected through the exhaust communication path 166 of the switching valve 124. 4 sections 164d, and then discharged through the same path as in the forward rotation. As described above, when the belt-type polishing tool 100 rotates forward, the second motor air supply port 138 becomes a motor exhaust port, and the second branch air supply path 156 forms a part of the exhaust path. During the reverse rotation, the first motor air supply port 136 becomes a motor exhaust port, and the first branch air supply path 154 forms a part of the exhaust path.

In this way, by shifting the switching valve 124 between the forward rotation position and the reverse rotation position, the rotation direction of the air motor 112 is switched between the forward rotation and the reverse rotation, whereby the rotation direction of the endless grinding belt 122 is changed. Furthermore, by adjusting the rotation position of the switching valve 124 between the forward rotation position and the reverse rotation position, the opening area between the air supply communication path 162 and the first branched air supply path 154 or the second branched air supply path 156 can be changed. Thereby, the amount of compressed air supplied to the air motor 112 can be adjusted to adjust the rotation speed of the air motor 112.

When the switching valve 124 is in the neutral position (FIG. 6B), when the operation ring 150 is set to the driving position and the on-off valve 126 is set to the open position, compressed air passes from the air supply passage 144 to the supply via the switching valve 124 The first branched air supply path 154 and the second branched air supply path 156 which are communicated with each other by the air communication path 162. A part of the compressed air enters the motor chamber 128 from the first motor air supply port 136 and the second motor air supply port 138, respectively, and flows around the rotor 132 in a reverse direction through the inner peripheral surface 128a of the motor chamber 128 and the blades 134. Then, it is discharged from the motor exhaust port 140 through the exhaust passage 164. At this time, in the motor chamber 128, substantially the same amount of compressed air flows in the opposite direction to each other, and the rotors 132 are opposed to each other and the forces of the same magnitude in the direction of rotation act on each other, so the rotor 132 does not substantially rotate. In addition, since the opening area between the air supply communication passage 162 of the switching valve 124 and the first and second branched air supply passages 154 and 156 is narrowed as shown in FIG. 6B, even the air supplied from the first motor air supply port 136 There is a gap between the amount of compressed air and the amount of compressed air supplied from the second motor air supply port 138, so that the force acting on the rotor 132 is deflected, and it does not become the air motor 112 and the driving pulley connected to the air motor 112. 116, etc., a force sufficient to rotate, the air motor 112 still does not rotate. The remaining compressed air flows from the first branched air supply path 154 and the second branched air supply path 156 through the exhaust communication path 166 of the switching valve 124 without passing through the air motor 112, and is then discharged from the exhaust path 164. As such, when the switching valve 124 is in the neutral position, the compressed air does not substantially rotate the air motor 112 but is discharged through the exhaust passage 164. At this time, since the exhaust sound is generated by the compressed air discharged through the exhaust passage 164, the operator can easily recognize that the on-off valve 126 is in the open position with the switching valve 124 in the neutral position. In addition, as described above, the path through which the compressed air is discharged includes both the path through the air motor 112 and the path that does not pass through the air motor 112, but the compressed air may be discharged through only one path. For example, when the blades 134 of the air motor 112 abut the inner peripheral surface 128a of the motor chamber 128 without gap, the compressed air cannot pass through the rotor 132 chamber. Therefore, virtually all the compressed air passes through the exhaust communication path 166 through the switching valve 124. The path is discharged. Regarding which path the compressed air will be discharged through, or at what flow ratio to flow through the two paths, it depends on the flow path resistance of each path.

As shown in FIGS. 7 to 10, a pneumatic tool according to a second embodiment of the present invention is a belt-type polishing tool 200 provided with a handle 250 for operating an opening / closing valve 226. By pivoting the handle 250, the operation shaft 248 of the on-off valve 226 is pressed inward and displaced from the closed position to the open position.

The tool body 210 of the belt-type polishing tool 200 includes a first body portion 210-1 including an air motor 212 and a switching valve 224, and a second body portion 210-2 including an on-off valve 226 and a handle 250. The second body portion 210-2 is arranged coaxially with respect to the first body portion 210-1 and is rotatably attached to the first body portion 210-1. By rotating the second body portion 210-2 with respect to the first body portion 210-1, the handle 250 can be changed between the position shown in FIG. 8 and the position shown in FIG. 15 which is 180 degrees from the position shown in FIG. As shown in FIG. 13, a plurality of locking recesses (second locking portions) 272 are formed on the rear end surface 270 of the first body portion 210-1 and arranged at intervals of 45 degrees in the circumferential direction. Further, as shown in FIGS. 12 and 14, a front end surface 271 of the second body portion 210-2 is attached with a ball plug (first locking portion) 274 having a ball that is pressed by a spring. In the state of FIGS. 11 to 14, the second body portion 210-2 is rotated 45 degrees with respect to the first body portion 210-1, and the ball plug 274 is fitted into one of the locking recesses 272, thereby making the second body The position of the portion 210-2 with respect to the rotation direction of the first body portion 210-1 is maintained at a position of 45 degrees. Similarly, even if the rotation position of the second body portion 210-2 with respect to the first body portion 210-1 is 0 degrees, 90 degrees, 135 degrees, and 180 degrees, the ball plug 274 is fitted to a plurality of latches. One of the recessed portions 272 holds the position in the rotation direction of the second body portion 210-2. In this way, by changing the rotation direction position of the second body portion 210-2, the direction of the handle 250 can be changed in accordance with the work content or according to the operator's preference, and workability can be improved. Furthermore, the rotation range of the second body portion 210-2 may be limited to a narrower range, or it may be rotated 360 degrees without limitation. In addition, the arrangement interval of the locking recessed portions 272 can be variously changed, such as finer position adjustment and a narrower interval. Moreover, the first portion 244a formed by the first body portion 210-1 in the air supply path 244 and the second portion 244b formed by the second body portion 210-2, regardless of the second body portion 210-2 Whatever the position in the rotation direction of the first body portion 210-1 is, they are always connected. Similarly, the second portion 264b and the fourth portion 264d formed by the first body portion 210-1 in the exhaust passage 264, regardless of the rotation of the second body portion 210-2 with respect to the first body portion 210-1. Whatever the directional position is, it always communicates with the fifth portion 264e formed in the second body portion 210-2 via the third portion 264c between the first body portion 210-1 and the second body portion 210-2.

As shown in FIG. 10, the handle 250 is provided with a handle fixing member 276 for fixing to the stop position where the on-off valve 126 is set to the closed position to prevent displacement to the drive position. The handle 250 is fixed to the stop position in advance by the handle fixing member 276, which can prevent the handle 250 from being accidentally displaced to the driving position and the driving air motor 112 is driven. In particular, when the second body portion 210-2 is rotated relative to the first body portion 210-1, the handle 250 may be easily pivoted and the air motor 112 may be inadvertently driven. However, the handle is fixed by the handle 276 In addition, the handle 250 is fixed to the stop position in advance, and the rotation direction position of the handle 250 can be adjusted safely.

As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment. For example, the present invention may be other pneumatic tools such as a torque wrench other than a belt-type grinding tool. In addition, the path of the exhaust of compressed air when the switching valve position is in the neutral position does not necessarily need to include both a path passing through the air motor and a path not passing through the air motor, and only either one may be provided.

100‧‧‧ Belt Grinding Tool (Pneumatic Tool of the First Embodiment)

110‧‧‧tool body

112‧‧‧Air Motor

114‧‧‧Drive shaft

116‧‧‧Drive pulley

118‧‧‧ pulley support rod

120‧‧‧Idle pulley

122‧‧‧Endless grinding belt

124‧‧‧ switching valve

126‧‧‧Open and close valve

128‧‧‧Motor Room

128a‧‧‧Inner peripheral surface

130‧‧‧Motor housing

132‧‧‧rotor

134‧‧‧ Blade

136‧‧‧The first motor air supply port

138‧‧‧ 2nd motor air supply port

140‧‧‧motor exhaust

142‧‧‧Air supply port

144‧‧‧Air supply channel

146‧‧‧ (open and close valve) spring

148‧‧‧operation axis

150‧‧‧operation ring (operation member)

150a‧‧‧ sliding inner peripheral surface

152‧‧‧ (operating ring) spring

154‧‧‧The first divergent gas supply channel

156‧‧‧Second branch gas supply channel

158‧‧‧valve housing

160‧‧‧ operation knob

162‧‧‧Air supply communication path

164‧‧‧Exhaust passage

164a‧‧‧Part 1

164b‧‧‧Part 2

164c‧‧‧Part 3

164d‧‧‧Part 4

164e‧‧‧Part 5

166‧‧‧Exhaust communication passage

168‧‧‧ exhaust port

200‧‧‧ Belt Grinding Tool (Pneumatic Tool of the Second Embodiment)

210‧‧‧Tool body

210-1‧‧‧The first body part

210-2‧‧‧The second body part

212‧‧‧Air Motor

224‧‧‧Switching valve

226‧‧‧Open and close valve

244‧‧‧Air supply channel

244a‧‧‧Part 1

244b‧‧‧Part 2

248‧‧‧operation axis

250‧‧‧Handle (operating member)

264‧‧‧Exhaust passage

264b‧‧‧Part 2

264c‧‧‧Part 3

264d‧‧‧Part 4

264e‧‧‧Part 5

270‧‧‧ rear face

271‧‧‧front face

272‧‧‧locking recess (second locking portion)

274‧‧‧ball plug (1st stop)

276‧‧‧Handle fixing member

FIG. 1 is a top view of a belt-type polishing tool according to a first embodiment of the present invention. FIG. 2 is a side view of the belt-type polishing tool of FIG. 1. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2. FIG. 4 is a side sectional view taken along the line BB in FIG. 3. FIG. 5 is a side cross-sectional view taken along the line C-C in FIG. 3. FIG. 6A is an enlarged cross-sectional view of the periphery of the switching valve, and is a view showing a state where the switching valve is in the forward rotation position. FIG. 6B is an enlarged sectional view of the periphery of the switching valve, and is a view showing a state where the switching valve is in a neutral position. FIG. 6C is an enlarged sectional view of the periphery of the switching valve, and is a view showing a state where the switching valve position is in the reverse position. 7 is a top view of a belt-type polishing tool according to a second embodiment of the present invention. FIG. 8 is a side view of the belt-type polishing tool of FIG. 7. FIG. 9 is a top cross-sectional view taken along the line DD in FIG. 8. FIG. 10 is a side cross-sectional view taken along the line E-E of FIG. 9. FIG. 11 is a side view of the belt-type polishing tool of FIG. 7 and is a view showing a state where the second body portion is rotated by 45 degrees. FIG. 12 is a sectional view taken along the line FF in FIG. 11. FIG. 13 is a view showing an end face of the first body portion viewed from a line G-G in FIG. 12. FIG. 14 is a view showing a front end surface of the second body portion viewed from a line H-H in FIG. 12. FIG. 15 is a side view of the belt-type polishing tool of FIG. 7, and is a view showing a state where the second body portion is rotated 180 degrees.

Claims (8)

A pneumatic tool includes an air motor having a first motor air supply port and a second motor air supply port, and when compressed air is supplied from the first motor air supply port, it rotates forward and from the second motor air supply port. Reversed when compressed air is supplied, the pneumatic tool includes: an air supply port connected to an external compressed air supply source; an air supply passage extending from the air supply port; and a first air supply port extending to the first motor air supply port of the air motor. A branched air supply path; a second branched air supply path extending to the second motor air supply port of the air motor; an exhaust path for exhausting compressed air to the outside; arranged in the middle of the air supply path, and An on-off valve that opens a displacement between an open position of the air supply path and a closed position that closes the air supply path; performing an opening and closing operation on the opening and closing valve, and setting the opening and closing valve to a driving position of the opening position and opening and closing A valve is provided as an operating member displaced between the closed position and the stop position; and the valve is arranged between the air supply path and the first and second branched air supply paths, and the first branched supply can be made to the air supply path Air passage A forward rotation position for blocking the second branched air supply path, a neutral position for connecting the first and second branched air supply paths to the gas supply path, and a blocking of the first branched air supply path for the gas supply path When the switching valve for displacing between the reversed positions of the second branched air supply passage communicates, when the on-off valve is in the open position and the switching valve is in the neutral position, the compressed air supplied from the air supply port is switched from The air supply path reaches the first and second branched air supply paths, and is discharged through the exhaust path without actually rotating the air motor. The pneumatic tool according to item 1 of the patent application scope, wherein the switching valve has an exhaust communication passage, and when in the neutral position, the first and second branched air supply passages communicate with each other through the exhaust communication passage. In the exhaust passage, when the on-off valve position is in the open position and the switching valve position is in the neutral position, at least a part of the compressed air reaching from the air supply path to the first and second branched air supply paths from the first The first and second branched air supply passages flow through the exhaust communication passage to the exhaust passage without passing through the air motor. The pneumatic tool according to item 2 of the scope of patent application, wherein the switching valve is configured to be rotatable with the rotation center axis as a center, and the switching valve further has a C-shaped air supply communication path, the air supply communication path, A cross section of a plane perpendicular to the rotation center axis is extended into an arc shape with the rotation center axis as a center, and the exhaust communication path is formed between both ends in the circumferential direction of the air supply communication path. When the switching valve position is in the forward rotation position, the air supply path communicates with the first divergent air supply path through the air supply communication path. When the switching valve position is in the neutral position, the air supply path, It communicates with the first and second branched air supply passages through the air supply communication passage. When the switching valve is in the reverse position, the air supply passage and the second branched air supply passage pass through the air supply communication passage. Connected. The pneumatic tool according to item 1 of the patent application scope, wherein the air motor is a cylindrical motor chamber having a circular cross section, and a vane motor provided with a rotor rotatable in the motor chamber, and has a motor exhaust port. The motor exhaust port is located at a substantially equal distance from the first and second motor air supply ports adjacent to each other and opening in the motor chamber, and communicates with the exhaust passage, and the on-off valve position In the open position and the switching valve position is in the neutral position, at least a part of the compressed air reaching the first and second branched air supply paths from the air supply path is respectively from the first and second motor air supply ports. Enter the motor chamber, and then flow countercurrently around the rotor to reach the motor exhaust port, and then flow to the exhaust path. The pneumatic tool according to item 1 of the patent application scope, wherein the operating member can be held in the driving position. The pneumatic tool according to item 1 of the patent application scope, wherein the switching valve has an exhaust communication passage, and when in the neutral position, the first and second branched air supply passages communicate with each other through the exhaust communication passage. In the exhaust passage, when the on-off valve position is in the open position and the switching valve position is in the neutral position, at least a part of the compressed air reaching from the air supply path to the first and second branched air supply paths from the first The first and second branched air supply passages flow to the exhaust passage through the exhaust communication passage without passing through the air motor. The air motor is a cylindrical motor chamber having a circular cross section and is provided in the motor chamber. Rotary vane motor with a motor exhaust port located at the first and second motor air supply ports adjacent to each other in the motor chamber and opening each other, and are substantially equal in the circumferential direction. Distance, and communicate with the exhaust passage, when the on-off valve position is in the open position and the switching valve position is in the neutral position, at least at least the compressed air from the air supply path to the first and second branched air supply paths In part, the first and second motor air inlets enter the motor chamber respectively, and then flow countercurrently along the periphery of the rotor to reach the motor exhaust port, and then flow to the exhaust path, and the operating member can be Stay in this drive position. The pneumatic tool according to any one of claims 1 to 6 of the scope of patent application, which includes: a first body portion including the air motor and the switching valve; and the opening and closing valve and the operating member, and is installed The second body portion is rotatable with respect to the first body portion, and one of the first body portion and the second body portion has a first locking portion, and the other has a fit with the first locking portion. When the second body portion rotates relative to the first body portion, the first body portion is fitted in the plurality of second body portions in a plurality of relative rotation positions. Position of the second body portion relative to the rotation direction of the first body portion. The pneumatic tool according to item 7 of the patent application scope, wherein the operating member is a handle that is pivotably mounted on the second body portion, and the pneumatic tool is additionally provided with a handle that prevents the handle from being moved to the driving position. Fixed member.