TW201600238A - Air polisher - Google Patents

Abstract

To provide an air polisher configured so that, when stopping the polishing pad, operation of an operation lever can be performed without lifting the palm of the hand, which is grasping the body, from the body. An air polisher (10) configured so that when a worker grasps the grip-side (24) of the body (16), which houses an air motor (14) for driving the rotation of the polishing pad (12), an operation lever (18) for operating the opening and closing of an on-off valve (28) that opens and closes a compressed air supply path (26) is pressed by the palm of the hand and moves, thereby opening said on-off valve (28). Said air polisher is configured so that if, while the operation lever (18) is still pressed by the palm of the hand, the operation lever (18) is moved in a direction that intersects with the pressing direction, the on-off valve (28) shifts from an open state to a closed state and driving of the rotation of the polishing pad (12) is stopped.

Description

Pneumatic grinder

The present invention relates to a pneumatic grinder that presses a polishing pad that is rotationally driven by a pneumatic motor against a material to be ground, thereby grinding the material to be polished, in particular, a grinding machine that mounts the polishing pad on a pneumatic motor. One side (lower side) of the main body portion is held by a pneumatic grinder that presses the polishing pad against the opposite side (upper side) of the main body portion and presses the polishing pad against the material to be polished.

In the above-mentioned grip type pneumatic grinder, the operating lever is usually pressed by the palm of the hand holding the main body portion, so that the valve of the compressed air supply passage is opened and the air motor is driven to move the palm of the hand away from the main body portion. The operation lever is displaced in a direction away from the main body portion to stop the air motor by closing the valve (Patent Document 1).

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 3443025

However, in the above-described grip type pneumatic grinder, when the driving of the polishing pad is stopped, as described above, the palm of the hand holding the main body portion must be lifted from the main body portion to operate the operating lever, and at this time, the grip of the main body portion is changed. If it is insufficient, it is easy to cause the posture of the pneumatic grinder or the force for pressing the polishing pad against the material to be polished to become unstable. Therefore, the polishing pad in rotation only causes the polishing material to abut against the material to be polished, or the force due to the pressing contact is lowered, so that the load on the polishing pad is lowered, and the rotation speed is sharply increased to cause the polishing process to become uneven.

SUMMARY OF THE INVENTION The present invention is directed to providing a pneumatic grinding machine which can perform the operation of an operating lever when the polishing pad is stopped without lifting the main body portion from the palm of the hand holding the main body portion.

That is, the present invention provides a pneumatic grinding machine comprising: a pneumatic motor for rotationally driving the polishing pad; a main body portion for housing the air motor, and having: a pad holding side for rotatably holding the polishing pad; a gripping side gripped by a hand on the opposite side of the pad holding side; and a compressed air supply line connected to an external compressed air supply source and supplying compressed air to the air motor; a valve for causing the compressed air supply path switch And can connect the above pressure An opening state of the air supply passage and a displacement between the closed state of the compressed air supply passage; and an operating lever movably attached to the main body portion, wherein the operator holds the main body on the holding side of the main body portion a pressing surface that is pressed by the palm of the hand, and the operating lever is pressed by the palm of the hand that presses the pressing surface, thereby shifting the valve from the closed state to the open state, and the palm of the hand The pressed state is maintained, and the valve is moved in a direction intersecting the pressing direction to displace the valve from the open state to the closed state.

In the pneumatic grinder, when the operation of the operating lever is performed to shift the valve from the open state to the closed state to stop the polishing pad, the palm of the hand is pressed to operate the state of the operating lever, so that the palm of the hand does not need to be The operation of the operating lever can be performed by lifting the holding side of the main body. Thereby, the grip side of the main body portion can be stably held until the rotation of the polishing pad is completely stopped, so that the posture of the pneumatic grinder is stabilized, and the sheet surface of the polishing pad is not easily abutted or the rotation speed is increased as described above.

Specifically, the operation lever may be pivoted between a closed position in which the valve is in the open state and an open position in which the palm of the hand that presses the pressing surface is pressed to open the valve, and the opening is performed. When the position is displaced in the longitudinal direction of the operating lever, the valve can be displaced from the open state to the closed state.

More specifically, the one end of the operating lever has an elongated hole extending in the longitudinal direction of the operating lever, and has a pivot shaft into which the main body portion is inserted, and the operating lever is at the pivoting shaft Peripheral axis Rotating and along the pivot axis are displaceable in the length direction described above.

More specifically, the operation lever has a main lever and a sub-bar that are movably attached to the main body portion, and when the main lever pushes the main lever with the palm of the hand, the main lever is pushed and moved to cause the above-mentioned main lever Displaceing the valve from the closed state to the open state, and when the main rod moves the valve in the upward direction to the intersecting direction, releasing the pressing of the main rod may displace the valve from the open state To the above closed state.

More specifically, the main rod has a receiving portion that can receive the size of the sub-rod, and the main rod is moved when the sub-rod is pressed in a state in which the valve is moved in the open state. Receiving the sub-rod and releasing the pressing of the main lever by the main lever, the valve can be displaced from the open state to the closed state.

Preferably, the first elastic member may be configured such that the valve is biased in a direction in which the valve is closed, and the second elastic member is biased in a direction opposite to the intersecting direction.

The first elastic member that pushes the valve in the direction of closing is opened, and when the operator's hand is separated from the main body portion, the valve is automatically closed and the polishing pad is stopped. Therefore, the worker's hand does not leave. Drive the polishing pad to improve the safety of the work. Further, the second elastic member that pushes the main lever in the opposite direction to the intersecting direction is provided, and when the pressing of the main lever in the intersecting direction is released, the main lever automatically returns to the initial position.

Or the above operation lever may also have a receiving portion, the above operation When the lever is moved in the above-described open state in the above-described open state, the position of the receiving portion is integrated with the position of the valve to release the pressing of the valve by the operating lever, so that the valve can be The open state is shifted to the above closed state.

With the above configuration, the operating lever can be constituted by one member.

Specifically, the receiving portion may be one of an opening and a recess.

Preferably, the direction in which the intersecting direction is substantially orthogonal to the direction of the pressing may be set.

More preferably, the surface pressed by the palm of the hand of the above-mentioned operating lever is a surface parallel to the intersecting direction.

Hereinafter, an embodiment of the pneumatic mill of the present invention will be described with reference to the accompanying drawings.

10‧‧‧Pneumatic grinding machine

12‧‧‧ polishing pad

14‧‧‧Air motor

16‧‧‧ Main body

18‧‧‧Operator

18-1‧‧‧ main pole

18-2‧‧‧Auxiliary

20‧‧‧Rotary drive shaft

22‧‧‧The pad holding side

24‧‧‧ holding side

26‧‧‧Compressed air supply channel

28‧‧‧Switching valve

30‧‧‧ Seat Department

32‧‧‧ Sealing Department

34‧‧‧ valve operating shaft

36‧‧‧ Spring

42‧‧‧ pivot axis

44‧‧‧Wheel components

46‧‧‧ long hole

48‧‧‧Support side section

50‧‧‧Pushing operation department

52‧‧‧ Front-end operation department

54‧‧‧Apartment

56‧‧‧Bend support

58‧‧‧Torque coil spring

60‧‧‧ gap

62‧‧‧ openings

64‧‧‧Rotation center axis

66‧‧‧Rotation center shaft

68‧‧‧Eccentric axis

70‧‧‧Eccentric shaft

72‧‧‧ bearing

74‧‧‧ polishing pad holding member

76‧‧‧ screws

78‧‧‧Connectors

80‧‧‧Air hose

82‧‧‧Regulator

84‧‧‧ inner surface

86‧‧‧ cylinder

88‧‧‧Rotor

90‧‧‧blade trough

92‧‧‧ blades

94‧‧‧ Air supply holes

96‧‧‧Connecting hose

98‧‧‧ venting holes

100‧‧‧Exhaust space

102‧‧‧Exhaust outlet

104‧‧‧Compressed air exhaust

105‧‧‧Hose installation

106‧‧‧Upper end

107‧‧‧ dust collecting holes

108‧‧‧ Bearing

109‧‧‧Dust collection pathway

110‧‧‧bearing support

112‧‧‧inside

114‧‧‧ recess

116‧‧‧Cylinder support members

118‧‧‧ peripheral surface

120‧‧‧External thread

122‧‧‧Threaded Department

124‧‧‧ Bearing

126‧‧‧ back end

128‧‧‧Pushing surface

130‧‧‧ front end

132‧‧‧ rear edge

210‧‧‧Pneumatic grinding machine

218‧‧‧Operation lever

228‧‧‧Switching valve

234‧‧‧ valve operating shaft

242‧‧‧ pivot axis

250‧‧‧Pushing operation department

258‧‧‧Torque coil spring

262‧‧‧ recess

263‧‧‧ sloped surface

Fig. 1 is a side view of a pneumatic grinding machine according to a first embodiment of the present invention.

Fig. 2 is a top view of the pneumatic grinder of Fig. 1.

Fig. 3 is a side cross-sectional view of the pneumatic grinder of the III-III line of Fig. 2.

Fig. 4 is a top cross-sectional view showing the flow path structure of the pneumatic grinder of the IV-IV line of Fig. 1.

Fig. 5A is a view showing the side of the first state of the pneumatic grinder of Fig. 1 view.

Fig. 5B is a side cross-sectional view of Fig. 5A.

Fig. 6A is a side view showing the second state of the pneumatic grinder of Fig. 1.

Fig. 6B is a side cross-sectional view of Fig. 6A.

Fig. 7A is a side view showing a third state of the pneumatic grinder of Fig. 1.

Fig. 7B is a side cross-sectional view of Fig. 7A.

Fig. 8 is a side cross-sectional view showing a first state of the pneumatic grinding machine according to the second embodiment of the present invention.

Fig. 9 is a side cross-sectional view showing a second state of the pneumatic grinder of Fig. 8.

Fig. 10 is a side cross-sectional view showing a third state of the pneumatic grinder of Fig. 8.

The pneumatic grinder 10 according to the first embodiment of the present invention, as shown in Figs. 1 to 3, includes a pneumatic motor 14 for rotationally driving the polishing pad 12, a main body portion for accommodating the air motor 14, and an axial rotation. The operating lever 18 is attached to the main body portion 16. The main body portion 18 is provided with a pad holding side 22 that connects the polishing pad 12 to the rotary drive shaft 20 of the air motor 14 and is rotatably held, and can be held by the operator when the position is on the opposite side of the pad holding side 22. Holding the side 24. Further formed in the main body portion 16 is compressed air from an external compressed air supply source (not shown). The compressed air supply passage 26 for the air motor 14 is provided with an on-off valve 28 for switching the compressed air supply passage 26 in the middle of the compressed air supply passage 26. The on-off valve 28 has a seal portion 32 that is sealingly engaged with the valve seat portion 39 formed on the peripheral surface of the compressed air supply passage 26, and a valve that extends from the seal portion 32 to the outside of the main body portion 16 and abuts against the operating lever 18. Operate the shaft 34. The pneumatic grinder 10 pushes the operating lever 18 with the palm of the hand and rotates the shaft thereof, thereby displacing the valve operating shaft 34 to perform the switching operation of the switching valve 28, and supplying compressed air to the air motor 14 to rotationally drive the polishing pad 12, The pressing of the abrasive material of the polishing pad 12 is performed by pressing.

The on-off valve 28 can block the closed state of the compressed air passage 26 at the seat portion 30 of the seal portion 32 sealed to the compressed air supply passage 26 (Fig. 3), and the seat portion of the seal portion 32 from the compressed air supply passage 26. The portion 30 is displaced to displace between the open state (Fig. 6B) in which the compressed air supply passage 26 communicates. A spring 36 is provided in the compressed air supply passage 26 such that the seal portion 32 is pushed upward from the drawing, whereby the spring force of the spring 36 pushes the seal portion 32 against the valve seat portion 30 of the compressed air supply passage 26. The switch valve 28 is maintained in the closed state.

The operating lever 18 is composed of a main lever 18-1 and a sub-bar 18-2 disposed on the lower side of the main lever 18-1. A pivot shaft 42 is attached to the main body portion 16, and the main lever 18-1 has a support side portion 48 that forms an elongated hole 46 that engages with the hub member 44 attached to the pivot shaft 42. The main lever 18-1 further includes a pressing operation portion 50 that extends forwardly from the support side surface portion 48, and a distal end operation portion 52 that is bent downward at the distal end of the pressing operation portion 50. The long hole 46 formed in the support side portion 48 is a pushing operation of the main rod 18-1 The portion 50 extends in the longitudinal direction and has a width substantially the same as the diameter of the hub member 44 attached to the peripheral surface of the pivot shaft 42. Thereby, the main rod 18-1 is pivotable with respect to the pivot shaft 42 and straight in the longitudinal direction of the long hole 46. The auxiliary lever 18-2 has an abutting portion 54 that abuts against the main lever 18-1, and a curved support portion 56 that is bent around the pivot shaft 42 so as to be rotatable with respect to the pivot shaft 42. A torsion coil spring 58 is attached around the pivot shaft 42, and one end thereof is engaged with the notch portion 60 of the main rod 18-1 and the main rod 18-1 is pushed forward (shown as the left side). An opening 62 is formed in the pressing operation portion 50 of the main lever 18-1, and the opening 62 is abutting portion with the negative lever 18-2 when the main lever 18-1 moves rearward against the elastic thrust of the torsion coil spring 58. 54 integrated location.

As shown in FIG. 3, the rotary drive shaft 20 of the air motor 14 has a central axis of rotation 66 extending along the central axis of rotation 64 of the air motor 14, and a position offset from the central axis of rotation 64 of the air motor 14 along An eccentric shaft portion 70 extending in an eccentric axis 68 extending parallel to the central axis of rotation 64 extends. The polishing pad holding member 74 is rotatably held by the eccentric shaft portion 70 through the bearing 72. The polishing pad 12 is screwed to the polishing pad holding member 74. Therefore, the polishing pad 12 is rotatably mounted around the eccentric axis. When the air motor 14 is driven by compressed air, the polishing pad 12 attached to the eccentric shaft portion 70 revolves around the central axis of rotation 64 of the air motor 14. When the polishing pad 12 revolves by the air motor 14 in a state where the polishing pad 12 is pressed against the workpiece, the polishing pad 12 rotates around the eccentric axis 68 by the frictional force from the material to be polished and the centrifugal force of rotation. That is, the pneumatic grinder 10 revolves the polishing pad 12 with respect to the central axis of rotation 64 of the air motor 14 and rotates around the eccentric axis 68. The polishing process of the material to be polished is performed by the rotation operation of the polishing pad 12 described above.

The compressed air supplied to the air motor 14 is supplied from an external compressed air supply source through an air hose 80 connected to a joint 78 fixed to the rear end of the main body portion 16. The compressed air supply passage 26 is provided with a regulating valve 82 which regulates the flow rate of the compressed air when the switching valve 28 is in the open state.

As shown in Fig. 4, the air motor 14 housed in the main body portion 16 has a cylinder 86 disposed at a gap with the inner peripheral surface 84 of the main body portion 16, and a rotary drive shaft rotatably supported in the cylinder 86. 20 and a rotor 88 fixed to the rotary drive shaft 20. Four vane grooves 90 are formed in the rotor 88, and slidable vanes 92 are disposed in each vane groove 90. The cylinder 86 is formed with a tapered air supply hole 94 in which a resinous connection hose 96 is attached. The connecting hose 96 has a tapered front end portion, and the front end portion is pressed and deformed toward the tapered air supply hole 94, and the connecting hose 96 is sealingly engaged with the cylinder 86. The compressed air supplied from the compressed air supply passage 26 flows into the cylinder 86 from the air supply hole 94 through the connecting hose 96. Thereby, the compressed air pushing blade 92 rotationally drives the rotor 88 and the rotary drive shaft 20. Four exhaust holes 98 are also formed in the cylinder 86, so that the compressed air which is pushed by the vane 92 toward the space between the cylinder 86 and the rotor 88 and is advanced is discharged to the inner peripheral surface 84 formed on the main body portion 16. An annular exhaust space 100 between the cylinders 86. Further, the connection hose 96 is connected to the exhaust space 100 transversely between the compressed air supply passage 26 and the air supply hole 94 of the cylinder 86. The compressed air guided to the exhaust space 100 is guided through the exhaust outlet 102 formed in the main body portion 16 The compressed air exhaust passage 104 is discharged to the outside. A hose mounting portion 105 to which a hose (not shown) communicating with the compressed air exhaust passage 104 is attached is provided at the rear end of the main body portion 16, and compressed air passing through the compressed air exhaust passage 104 is reached through the inside of the hose Dust bag (not shown). The compressed air exhaust passage 104 passes through the dust collecting passage 109 formed in the main body portion 16 (the inner side of the on-off valve 28 shown in Fig. 3 communicates with the compressed air exhaust passage 104) and the polishing pad 12 provided in Fig. 3 The dust collecting holes 107 communicate with each other, and when the compressed air passes through the compressed air exhaust passage 104, the compressed air exhaust passage 104 becomes a negative pressure state, and the air around the polishing pad 12 is sucked from the dust collecting holes 107. Thereby, the dust polished by the polishing pad 12 is sucked into the compressed air exhaust passage 104 from the dust collecting hole 105. The exhaust air leaves the dust contained therein in the dust bag and is vented to the atmosphere. An air hose 80 that supplies compressed air is also extended within the hose.

The pneumatic grinder 10 is a flow path for forming compressed air on the same plane in the air motor 14, so that the size of the air motor 14 in the height direction can be made small.

The bearing 108 supporting the upper end portion 106 of the rotary drive shaft 20 of the air motor 14 is press-fitted into the inner peripheral surface 112 of the cylindrical bearing support portion 110 provided in the main body portion 16 to be sealed and fixed. Since the bearing support portion 110 and the bearing 108 are disposed to protrude into the interior of the cylinder 86, the rotor 88 that rotates in the cylinder 86 is formed with a recess 114 that does not interfere with the center of the upper portion. A cylinder support member 116 is disposed below the cylinder 86 and the rotor 88, and a space in which the rotor 88 including the vane 92 is rotationally driven is partitioned. The cylinder support member 116 is formed by the external thread portion to be formed on the outer peripheral surface 118 thereof. The 120 latch is fixed to the main body portion 16 by the internal thread portion 122 formed in the main body portion 16. Further, the cylinder support member 116 holds a bearing 124 that rotatably supports the rotation center shaft portion 66.

The pneumatic grinder 10 has a configuration in which a part of the bearing 10 supporting the upper end portion 106 of the rotary drive shaft 20 of the air motor 14 is disposed in the cylinder 86, and the size in the height direction can be further reduced as compared with the conventional one.

Next, the operation of the pneumatic grinder 10 will be described with reference to FIGS. 5A to 7B. First, as shown in FIGS. 5A and 5B, in the first state in which the on-off valve 28 is in the closed state, the pneumatic grinder 10 is placed on the material to be polished. At this time, the on-off valve 28 is biased by the spring force of the spring 36, and the pressure of the compressed air supplied with the compressed air is pushed upward toward the upper side of the figure, and the seal portion 32 is sealed and engaged with the compressed air supply passage. The valve seat portion 30 of 26 is in a closed state. The sub-rod 18-2 that abuts against the valve operating shaft 34 and the main rod 18-1 that abuts against the sub-bar 18-2 are pushed toward the valve operating shaft 34 to be inclined toward the front upper side. Further, the main lever 18-1 is a position at which the hub member 44 that has moved forward to the pivot shaft 42 abuts against the rear end portion 126 of the long hole 46 by the elastic thrust of the torsion coil spring 58. The position of the operating lever 18 in this state is the closed position.

When the gripping side 24 of the main body portion 16 is gripped by the operator's hand and the palm of the hand is placed on the pressing surface 128 of the main body portion 16, the pressing operation portion 50 of the main lever 18-1 is pushed by the palm of the hand. The pressure causes the main lever 18-1 to rotate toward the pressing surface 128 of the main body portion 16 to rotate in the counterclockwise direction shown in the figure to the open positions shown in Figs. 6A and 6B. At this time, the sub-bar 18-2 is pressed by the abutting portion 54 toward the main lever 18-1 to rotate in the counterclockwise direction together with the main lever 18-1. As a result, the on-off valve 28 is pushed downward against the spring force of the spring 36 such that the seal portion 32 is separated from the valve seat portion 30 of the compressed air supply passage 26 to form an open state in which the compressed air supply passage 26 is communicated. In this second state, compressed air from an external compressed air supply source is supplied to the air motor 14 through the compressed air supply passage 26, and the air motor 14 is rotationally driven, with the polishing pad 12 coupled to the rotary drive shaft 20 of the air motor 14 The revolution is centered around the central axis of rotation 64 of the air motor 14. When the polishing pad 12 is appropriately pressed against the material to be polished by the hand holding the holding side 24 of the main body portion 16, the polishing pad 12 starts to be around the eccentric axis 68 by the frictional force and the rotational centrifugal force received from the material to be polished. rotation. The polishing pad 12 revolves and rotates and moves on the material to be polished to polish the abrasive.

When the driving of the polishing pad 12 is stopped, the front end operating portion 52 of the main lever 18-1 is pulled rearward by the finger (the right side in the drawing) so that the main lever 18-1 is oriented parallel to the pressing operation portion 50 and in the direction of the shaft rotation. Move in the direction of vertical crossing. 7A and 7B, when the boss portion 44 of the pivot shaft 42 moves the main lever 18-1 to a position where it abuts against the distal end portion 130 of the long hole 46, the push formed on the main lever 18-1 is pushed. The position of the opening 62 of the pressing operation portion 50 is integrated with the position of the abutting portion 54 of the sub-bar 18-2, and the pressing of the main lever 18-1 to the sub-bar 18-2 is released. In this way, the sub-bar 18-2 is rotated by the pressing force from the on-off valve 28 toward the clockwise direction and is received by the opening 62, so that the on-off valve 28 becomes the sealing portion 32 and is sealed and engaged with the compressed air. The closed state of the valve seat portion 30 of the supply passage 26. In this third state, the supply of compressed air to the air motor 14 is stopped, and the rotation of the air motor 14 and the polishing pad 12 is also stopped. Further, when the hand is separated from the main lever 18-1 in this state, the main lever 18-1 is moved forward by the elastic thrust of the torsion coil spring 58, but the rear end edge 132 of the opening 62 at this time is and is received by The abutting portion 54 of the sub-bar 18-2 projecting upward in the opening 62 is engaged, and thus moves along the sub-rod 18-2 and rotates clockwise toward the clockwise direction to return to the closed position shown in FIGS. 5A and 5B. . In the third state of FIGS. 7A and 7B, the finger from the main lever 18 is pulled by the front end operating portion 52 of the main lever 18-1 while the main lever 18-1 is pressed by the palm of the hand. When -1 is left, the main lever 18-1 moves forward by the elastic thrust of the torsion coil spring 58, and the rear end edge 132 of the opening 62 pushes the sub-bar 18-2 to rotate the shaft, and returns to the sixth diagram and The second state shown in Fig. 6B. That is, the holding and holding of the polishing pad 12 can be performed by holding the holding side 24 of the main body portion 14 with the hand and holding the main lever 18-1 in the palm of the hand.

As described above, in the pneumatic grinder 10, when the driving of the polishing pad 12 is stopped, the palm of the hand that presses the operating lever 18 is lifted from the pressing surface 128 of the main body portion 16, so that the main body can be stably held. Since the state of the portion 16 is maintained, the posture of the pneumatic grinder 10 can be maintained in a stable state. Thereby, it is possible to prevent a part of the polishing pad 12 that is being rotated from floating up from the material to be polished so that only one of the surface faces abuts against the material to be polished 12, and a polishing mark is generated in the material to be polished. Further, since the pressing force of the polishing pad 12 against the material to be polished is also stabilized, uneven polishing processing due to rapid acceleration of the polishing pad 12 can be prevented.

The pneumatic grinder 210 according to the second embodiment of the present invention shown in Figs. 8 to 10 is different from the pneumatic grinder 10 of the first embodiment in that the operation lever 218 is constituted by one member. The operation lever 218 of this embodiment is formed with a recessed portion 262 in the pressing operation portion 250. When the second state (9th drawing) in which the operating lever 218 is in the open position is pulled rearward, the recessed portion 262 receives the valve operating shaft 234 of the switching valve 228 to close the opening and closing valve 228 (Fig. 10). An inclined surface 263 is provided at the rear end of the concave portion 262, and when the working member 218 is moved forward by the spring force of the torsion coil spring 258 in the third state working unit of Fig. 10, the operating lever 218 is tilted forward. The surface 263 is engaged with the valve operating shaft 234 to push the operating lever 218 upward, and returns to the first state of Fig. 8. Further, in the third state of FIG. 10, when the force for pulling the operation lever 218 to the rear is released while the palm of the hand is pressed by the palm of the hand, the operation lever 218 is biased by the spring force of the torsion coil spring 258. Moving forward, the inclined surface 263 moves the valve operating lever 234 downward, and returns to the second state of Fig. 9.

In the first embodiment, the main rod 18-1 has the opening 62 as a portion for receiving the sub-bar 18-2. However, the opening 62 may be provided as a recess of the operation lever 218 according to the second embodiment. Conversely, the recess 262 of the operating lever 218 of the second embodiment may be the opening 62 of the first embodiment. In the above-described embodiment, when the switching valves 28 and 228 are turned off from the open state, the direction in which the main lever 18-1 (the operating lever 218) is moved is the direction toward the rear, but it is also possible to move in the forward or left-right direction. Or rotational movement about a different axis than the pivot axes 42, 242.

10‧‧‧Pneumatic grinding machine

12‧‧‧ polishing pad

14‧‧‧Air motor

16‧‧‧ Main body

18‧‧‧Operator

18-1‧‧‧ main pole

18-2‧‧‧Auxiliary

20‧‧‧Rotary drive shaft

22‧‧‧The pad holding side

24‧‧‧ holding side

26‧‧‧Compressed air supply channel

28‧‧‧Switching valve

30‧‧‧ Seat Department

32‧‧‧ Sealing Department

34‧‧‧ valve operating shaft

36‧‧‧ Spring

42‧‧‧ pivot axis

50‧‧‧Pushing operation department

52‧‧‧ Front-end operation department

54‧‧‧Apartment

56‧‧‧Bend support

58‧‧‧Torque coil spring

62‧‧‧ openings

64‧‧‧Rotation center axis

66‧‧‧Rotation center shaft

68‧‧‧Eccentric axis

70‧‧‧Eccentric shaft

72‧‧‧ bearing

74‧‧‧ polishing pad holding member

76‧‧‧ screws

78‧‧‧Connectors

80‧‧‧Air hose

82‧‧‧Regulator

86‧‧‧ cylinder

88‧‧‧Rotor

94‧‧‧ Air supply holes

96‧‧‧Connecting hose

98‧‧‧ venting holes

100‧‧‧Exhaust space

105‧‧‧Hose installation

106‧‧‧Upper end

107‧‧‧ dust collecting holes

108‧‧‧ Bearing

109‧‧‧Dust collection pathway

110‧‧‧bearing support

112‧‧‧inside

114‧‧‧ recess

116‧‧‧Cylinder support members

118‧‧‧ peripheral surface

120‧‧‧External thread

122‧‧‧Threaded Department

124‧‧‧ Bearing

128‧‧‧Pushing surface

Claims (10)

A pneumatic grinding machine comprising: a pneumatic motor for rotationally driving the polishing pad; a main body portion accommodating the air motor, and having: a pad holding side for rotatably holding the polishing pad; opposite to a holding side of the pad a gripping side gripped by a hand during side work; and a compressed air supply line connected to an external compressed air supply source and supplying compressed air to the air motor; a valve for making the compressed air supply path switch and connecting the above compression An opening state of the air supply passage and a displacement between the closed state of the compressed air supply passage; and an operating lever movably attached to the main body portion, and an operator holds the main body portion on a holding side of the main body portion When the pressing surface is pressed by the palm of the hand, the operating lever is pressed by the palm of the hand that pushes the pressing surface, so that the valve is displaced from the closed state to the open state, and is maintained by the palm of the hand. The pressed state is moved in a direction crossing the pressing direction to displace the valve from the open state to the closed state. The pneumatic grinding machine according to the first aspect of the invention, wherein the operation lever is configured to be in a closed position in which the valve is in the closed state and a palm of a hand that presses the pressing surface to cause the valve to be opened. The shaft is rotated between the open positions of the state, and the valve is displaced from the open state to the closed state when the longitudinal position of the operating lever is displaced in the open position. A pneumatic grinder as described in claim 2, One end of the operating rod has an elongated hole extending in the longitudinal direction of the operating rod, and has a pivot shaft into which the main body portion is inserted, and the operating rod is rotatable about a circumference of the pivot shaft And along the pivot axis, it is displaceable in the longitudinal direction. The pneumatic grinding machine according to any one of the preceding claims, wherein the operation lever has a main lever and a sub-rod that are movably attached to the main body portion, and the sub-rod is When the palm of the hand pushes the main rod, the main rod is pushed and moved to displace the valve from the closed state to the open state, and the main rod moves the valve in the above-mentioned open state toward the intersecting direction. When the pressing of the main lever is released, the valve is displaced from the open state to the closed state. The pneumatic grinder according to claim 4, wherein the main rod has a receiving portion that can receive the size of the sub-rod, and the main rod presses the sub-rod to open the valve in the open state. When the direction of the intersection is moved, the receiving portion receives the sub-bar to release the pressing of the sub-rod by the main lever, and the valve is displaced from the open state to the closed state. The pneumatic grinder according to claim 5, further comprising: a first elastic member that springs the valve in a direction to be in the closed state, and a second elastic member that faces the main rod Bouncing in the opposite direction to the above-mentioned crossing direction. The pneumatic grinding machine according to any one of the preceding claims, wherein the operating lever has a receiving portion, and the operating lever When the valve is pushed in the above-described open state, the position of the receiving portion is integrated with the position of the valve, and the pressing of the valve by the operating lever is released, so that the valve is opened from the open state. Displace to the above closed state. The pneumatic grinding machine according to claim 7, wherein the receiving portion is one of an opening and a recess. The pneumatic mill according to claim 1, wherein the intersecting direction is a direction substantially orthogonal to a direction of the pressing. The pneumatic grinder according to claim 1, wherein the surface of the operation lever that is pressed by the palm of the hand is a surface parallel to the intersecting direction.