JP2016185583A5 - - Google Patents

Description

Pneumatic tool

  The present invention relates to an air tool, and more particularly to an air tool provided with a mechanism for restricting operation of an operation lever.

  An air tool such as a pneumatic belt type polishing machine or a torque wrench that operates using compressed air as a drive source is usually an air motor and a tool body that houses the air motor and has an air supply path for supplying compressed air to the air motor. Part, a valve for opening and closing the air supply path, and an operation lever attached to the outside of the tool body part, and operating the operation lever to open and close the valve to operate the drive of the air motor ing.

  Among such air tools, there is one provided with a safety mechanism for preventing the operation lever from being inadvertently operated. For example, in the pneumatic tool shown in Patent Document 1, the operation of the operation lever is limited by engaging a stopper with the tip portion of the operation lever. The operation lever has a groove formed on one side surface, and the displacement of the operation lever is limited by the stopper engaging with the groove.

Utility Model Registration No. 2517035

  In the pneumatic tool provided with the safety mechanism as described above, the pneumatic tool is not activated by operating the operating lever even though the limiting member such as the stopper is in a position for limiting the operation of the operating lever. Thus, the displacement limitation of the operation lever by the stopper needs to be made stable and strong. However, in the conventional pneumatic tools as described above, the operation lever and the stopper are usually engaged in a slightly unstable state at only one place, and the stability of the engaged state is not always sufficient. It was.

  An object of the present invention is to provide an air tool in which a restricting member for restricting displacement of an operation lever is engaged with the operation lever in a more stable state.

That is, the present invention
An air motor,
A tool body having an air supply path for accommodating the air motor and supplying compressed air to the air motor;
A valve for opening and closing the air supply path;
An operation lever, which is mounted on the tool main body so as to be displaceable, for opening and closing the valve, between a stop position where the valve is closed and a drive position where the valve is open An operation lever having two locking protrusions that are displaceable at the position and protrude in a direction from the stop position toward the drive position;
A restricting member, which is attached to the tool main body so as to be displaceable, for restricting the displacement of the operation lever, and is opposed to the engagement protrusion so as to face the engagement protrusion of the operation lever. Two restricting projections projecting on the operating lever, and when the operating lever is about to be displaced from the stop position to the driving position, the operating lever is in contact with the corresponding engaging projection. A restriction position that prevents displacement to the driving position, and the two restriction protrusions and the two locking protrusions do not contact when the operating lever is displaced from the stop position to the driving position. A limiting member that is displaceable between a release position that allows the operation lever to be displaced to the drive position;
With
An air tool is provided in which the two locking protrusions and the two restricting protrusions are spaced from each other in the displacement direction of the restricting member.

  In the air tool, since the two locking projections of the operating lever are engaged with the two limiting projections of the limiting member, respectively, and the locking projections and the limiting projections are arranged at a distance from each other. Thus, the restricting member comes into contact with the operating lever in a more stable state than that engaged at one position.

Preferably,
The operating lever is attached to the tool body so as to pivot and displace between the stop position and the drive position;
The restricting member may be attached to the tool body so as to be displaced between the restricting position and the releasing position in a direction orthogonal to a plane on which the operating lever pivots. .

  More preferably, the operating lever has a lever body portion having a U-shaped cross section composed of two side walls and a bottom wall connecting the two side walls, and the two side walls are formed by at least a part of the two side walls. The locking projection can be configured.

  More preferably, the restricting member has a restricting member main body portion having a U-shaped cross section composed of two side walls and a top wall connecting the two side walls. Two restricting protrusions may be formed so that the distance between the two side walls of the restricting member is the same as the distance between the two side walls of the operating lever.

  By making the operation lever and the limiting member have such a U-shaped cross section, these members can be easily manufactured by sheet metal working.

Preferably,
The tool body includes an air supply pipe constituting the air supply path, and a housing that accommodates the air supply pipe,
The restricting member is disposed between the air supply pipe and the operation lever;
The air supply pipe has a guide surface adapted to slidably support the restricting member, and the guide surface is formed so as to face the locking projection of the operation lever. it can.

  With such a configuration, when the operation lever is operated with the restriction member in the restriction position and the restriction member is pressed by the operation lever, the restriction member is supported by the guide surface of the air supply pipe. It is possible to receive a force from the operation lever in the state.

  Preferably, a biasing member that biases the restriction member toward the restriction position can be further provided.

The tool body includes an air supply pipe that forms the air supply path, and a housing that houses the air supply pipe ,
The restricting member is disposed between the air supply pipe and the operation lever;
A lever main body having one end and a free end pivotally mounted in the housing, and an operation portion that is attached to the free end of the lever main body and partially protrudes outside the housing And the operation portion can be pushed to pivot the operation lever from the stop position toward the drive position .

In this embodiment, since only the operating portion of the operating lever protrudes outside the housing, for example, even when the air tool is dropped, the possibility of damaging the operating lever 34 is greatly reduced. Is possible.

  Embodiments of an air tool according to the present invention will be described below with reference to the accompanying drawings.

It is a side view of the air tool concerning one embodiment of the present invention. It is a top view of the air tool of FIG. It is a side view which shows the inside of the housing of the air tool of FIG. It is sectional drawing in the IV-IV line of FIG. It is a side view which shows an operation lever and a limiting member. FIG. 6 is a top view of the operation lever and the limiting member in FIG. 5. It is sectional drawing in the VII-VII line of FIG. 5, Comprising: It is a figure when a restricting member exists in a restriction | limiting position. It is sectional drawing in the VII-VII line of FIG. 5, Comprising: It is a figure when a restricting member exists in a cancellation | release position. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5 when the operation lever is in a driving position.

  As shown in FIGS. 1 and 2, the air tool 10 according to an embodiment of the present invention includes a tool main body 12 and a belt driving unit 14, and an air motor 16 (FIG. 3) accommodated in the tool main body 12. 4), the endless grinding belt 22 wound between the drive pulley (not shown) rotated by the pulley support member 18 and the idle pulley 20 rotatably supported by the pulley support member 18 is rotated and driven. A belt-type grinding tool 10 that grinds the work material by being pressed against the work material.

  As shown in FIGS. 3 and 4, the tool main body 12 includes a housing 24 that houses the air motor 16, and a separate air supply / exhaust pipe 26 disposed in the housing 24. An air supply path 28 for supplying compressed air to the air motor 16 and an exhaust path 30 for exhausting compressed air from the air motor 16 are formed in the air supply / exhaust pipe 26. The supply / exhaust pipe 26 includes a valve 32 for opening and closing the air supply passage 28, an operation lever 34 for operating the opening / closing of the valve 32, and a limiting member 36 for limiting the displacement of the operation lever 34. It is attached.

  The valve 32 includes a valve body 40 configured to be sealingly engaged with a valve seat portion 38 provided in the air supply passage 28, and a spring 42 that urges the valve body 40 to press the valve seat portion 38 against the valve seat portion 38. The valve operating shaft 44 is connected to the valve body 40 and extends to the outside of the air supply / exhaust pipe 26. When the valve operating shaft 44 is pushed into the air supply path 28, the valve body 40 is tilted, a gap is formed between the valve body 40 and the valve seat portion 38, and the air supply path 28 is opened. When the force for pushing the valve operating shaft 44 is released, the valve body 40 is again in a sealing engagement with the valve seat portion 38 by the urging force of the spring 42 to close the air supply passage 28. It is pushed back toward the outside of the air supply path 28.

  The operation lever 34 has a lever main body portion 46 accommodated in the housing 24 and an operation portion 48 that partially protrudes outside the housing 24. As shown in FIGS. 5 and 6, the lever main body 46 is composed of two side walls 50a and 50b and a bottom wall 52 connecting the side walls 50a and 50b. As shown in FIG. It has a letter shape. Also, lever attachment portions 54a and 54b extending between the air supply / exhaust pipe 26 and the housing 24 are connected to the two side walls 50a and 50b, respectively. Is sandwiched from the side. The operation lever 34 is pivotally attached to the supply / exhaust pipe 26 by a pivot 56 at the lever attachment portions 54a and 54b. 3 and 4, the valve 32 is in a closed state in which the air supply passage 28 is closed, and the operation lever 34 is directed downward as viewed in the figure by the valve operating shaft 44 of the valve 32 in the closed state. Pressed and held at the stop position. When the operating portion 48 of the operating lever 34 is pushed into the housing 24 and pivoted against the urging force of the spring 42 of the valve 32, the operating lever 34 is engaged with the bottom wall 52 of the lever main body 46. The valve operating shaft 44 is pushed into the air supply path 28, and the valve 32 is in an open state in which the air supply path 28 is opened. As described above, the operation lever 34 can pivot about the pivot 56 between the stop position where the valve 32 is closed and the drive position where the valve 32 is opened. By displacing from the stop position to the drive position, the valve 32 is opened, compressed air is supplied to the air motor 16, and the drive of the air tool 10 is started. The lever main body 46 and the lever mounting portions 54a and 54b are configured as an integral member manufactured by sheet metal processing.

As shown in FIGS. 5 and 6, the restricting member 36 includes a restricting member main body 62 having a U-shaped cross section including two side walls 58a and 58b and a top wall 60 connecting the side walls 58a and 58b. The operation unit 64 is fixed to the top wall 60 of the member main body 62. The restricting member 36 is attached to the air supply / exhaust pipe 26 so that the top wall 60 is slidably engaged with a guide surface 66 formed on the lower surface of the air supply / exhaust pipe 26, and the operation lever 34 pivots. It can be displaced in a direction perpendicular to the plane (the surface constituting the paper surface in FIGS. A spring 67 is set between the limiting member 36 and the housing 24, and the limiting member 36 is biased laterally (downward as viewed in FIG. 6) by the spring 67 . The limiting member main body 62 having a U-shaped cross section is manufactured by sheet metal processing.

  The two side walls 50a and 50b of the operation lever 34 protrude in a direction from the stop position to the drive position, that is, upward, and a part thereof constitutes locking protrusions 68a and 68b. On the other hand, the two side walls 58a and 58b of the limiting member 36 constitute limiting protrusions 70a and 70b that protrude in the opposite direction, that is, downward, with respect to the locking protrusions 68a and 68b of the operation lever 34. The locking projections 68a and 68b of the operating lever 34 and the limiting projections 70a and 70b of the limiting member 36 are both arranged at an interval in the displacement direction of the limiting member 36, and with respect to the plane on which the operating lever 34 pivots. Extending in parallel. The distance between the side walls 50a, 50b of the operating lever 34 and the distance between the side walls 58a, 58b of the restricting member 36 are the same. Therefore, in the displacement direction of the restricting member 36 between the two locking projections 68a, 68b. And the interval in the same direction between the two limiting protrusions 70a and 70b are also the same.

When the restricting member 36 is urged by the spring 67 and is in the restricting position of FIG. 7, the positions of the locking protrusions 68a and 68b and the restricting protrusions 70a and 70b corresponding thereto are aligned and face each other. Therefore, even when the operation lever 34 is pivoted from the stop position toward the drive position in a state where the restriction member 36 is in the restriction position, each of the locking protrusions 68a and 68b comes into contact with the corresponding restriction protrusions 70a and 70b. The displacement to the drive position is prevented. At this time, the operating lever 34 and the restricting member 36 are in contact with each other at two locations, so that the operating lever 34 and the restricting member 36 are in a stable state without receiving a biased stress. Further, since the limiting member 36 is attached to the guide surface 66 formed on the air supply / exhaust pipe 26 in the direction facing the locking projections 68a and 68b, the limiting member 36 pushed by the operation lever 34 is the guide surface 66. It is supported by and can maintain a stable posture. When the restricting member 36 is in the restricting position, the operation portion 64 of the restricting member 36 protrudes outside the housing 24 of the tool main body 12 as shown in FIG.

When the operating portion 64 of the limiting member 36 is pushed into the housing 24 against the urging force of the spring 67 , the limiting member 36 is displaced to the left as viewed in the drawing to the release position shown in FIG. When the restricting member 36 is in the release position, the restricting protrusions 70a and 70b of the restricting member 36 are directly in front of the engaging protrusions 68a and 68b of the operating lever 34 in the displacement direction of the operating lever 34 (vertical direction in the drawing). Will not face each other. Accordingly, when the operating portion 64 is pushed to displace the operating lever 34 from the stop position toward the driving position, the restricting projections 70a and 70b and the locking projections 68a and 68b are not in contact with each other. It can be displaced to the drive position shown in FIG. When the operation lever 34 is displaced to the driving position, the valve 32 is opened as described above, compressed air is supplied to the air motor 16, and the air tool 10 is driven. When the operation lever 34 is in the driving position, the locking protrusions 68a and 68b of the operation lever 34 and the restriction protrusions 70a and 70b of the restriction member 36 are nested, and the side walls 58a and 58b of the restriction member 36 are Since the side walls 50a and 50b are engaged with each other in the lateral direction, the restricting member 36 is held in the release position.

When the force pushing the operating portion 48 of the operating lever 34 in the driving position is loosened, the operating lever 34 is moved via the valve operating shaft 44 by the biasing force of the spring 42 of the valve 32 and the pressure received by the valve body 40 from the compressed air. Then it is pushed down and pivots to the stop position. As the operation lever 34 returns to the stop position, the restriction member 36 is also returned to the restriction position by the spring 67 .

  In the air tool 10, the amount of displacement required to displace the restricting member 36 from the restricting position to the releasing position is only the thickness of each side wall 58a, 58b, 50a, 50b. The amount of displacement of the limiting member 36 can be made smaller than the interval between the positions where the member 36 abuts, that is, the interval between the locking projections 68a and 68b and the interval between the limiting projections 70a and 70b. By reducing the displacement amount of the limiting member 36, the entire air tool 10 can be reduced in size.

  In the above embodiment, most portions of the operation lever 34 and the limiting member 36 are accommodated in the housing 24, and only the operation portions 48 and 64 of the operation lever 34 and the limiting member 36 protrude to the outside of the housing 24. It is like that. Therefore, for example, when the air tool 10 is dropped, the operation lever 34 and the limiting member 36 are not directly subjected to an impact, and the possibility that the operating lever 34 and the limiting member 36 are damaged is greatly reduced. It becomes possible.

  In the said embodiment, although the belt-type grinding tool is shown as one Embodiment of the air tool 10 of this invention, it can also be set as other tools, such as a polisher and a torque wrench. Further, although two each of the locking protrusions 68a and 68b of the operation lever 34 and the limiting protrusions 70a and 70b of the limiting member 36 are provided, additional locking protrusions and limiting protrusions may be provided. Furthermore, the air supply path 28 and the exhaust path 30 are configured by a supply / exhaust pipe 26 that is separate from the housing 24, but the air supply pipe that configures the air supply path 28 and the exhaust that configures the exhaust path 30. The pipe may be a separate member, or both or one of the air supply path 28 and the exhaust path 30 may be formed in the housing 24.

Air tool (belt grinding tool) 10; tool main body 12; belt drive 14; air motor 16; pulley support member 18; idle pulley 20; endless grinding belt 22; Exhaust path 30; Valve 32; Operation lever 34; Restriction member 36; Valve seat portion 38; Valve body 40; Spring 42; Valve operation shaft 44; Lever main body portion 46; Operation portion 48: Side walls 50a, 50b; Lever mounting portions 54a, 54b; pivot 56; side walls 58a, 58b; top wall 60; restricting member body 62; operating portion 64; guide surface 66; spring 67; locking projections 68a, 68b;

Claims (7)

An air motor,
A tool body having an air supply path for accommodating the air motor and supplying compressed air to the air motor;
A valve for opening and closing the air supply path;
An operation lever, which is mounted on the tool main body so as to be displaceable, for opening and closing the valve, between a stop position where the valve is closed and a drive position where the valve is open An operation lever having two locking protrusions that are displaceable at the position and protrude in a direction from the stop position toward the drive position;
A restricting member, which is attached to the tool main body so as to be displaceable, for restricting the displacement of the operation lever, and is opposed to the engagement protrusion so as to face the engagement protrusion of the operation lever. Two restricting projections projecting on the operating lever, and when the operating lever is about to be displaced from the stop position to the driving position, the operating lever is in contact with the corresponding engaging projection. A restriction position that prevents displacement to the driving position, and the two restriction protrusions and the two locking protrusions do not contact when the operating lever is displaced from the stop position to the driving position. A limiting member that is displaceable between a release position that allows the operation lever to be displaced to the drive position;
With
The air tool, wherein the two locking protrusions and the two restricting protrusions are arranged with an interval in the displacement direction of the restricting member. The operating lever is attached to the tool body so as to pivot and displace between the stop position and the drive position;
The restriction member is attached to the tool main body so as to be displaced between the restriction position and the release position in a direction perpendicular to a plane on which the operation lever pivots. Air tool.   The operation lever has a lever body portion having a U-shaped cross section composed of two side walls and a bottom wall connecting the two side walls, and the two locking projections are formed by at least a part of the two side walls. The pneumatic tool according to claim 1, wherein the pneumatic tool is configured.   The restricting member has a restricting member main body having a U-shaped cross section composed of two side walls and a top wall connecting the two side walls, and the two restricting projections are formed by at least a part of the two side walls. 4. The pneumatic tool according to claim 3, wherein the pneumatic tool is configured such that a distance between two side walls of the restricting member is the same as a distance between two side walls of the operating lever. The tool body includes an air supply pipe constituting the air supply path, and a housing that accommodates the air supply pipe,
The restricting member is disposed between the air supply pipe and the operation lever;
The air supply pipe has a guide surface adapted to slidably support the restriction member, and the guide surface is formed in a direction facing the locking projection of the operation lever. The air tool according to any one of 4.   The air tool according to any one of claims 1 to 5, further comprising a biasing member that biases the limiting member toward the limiting position. The tool body includes an air supply pipe constituting the air supply path, and a housing that accommodates the air supply pipe,
The restriction member is disposed between the air supply pipe and the operating lever, and the operating lever has a lever body having one end pivotally mounted in the housing and a free end, and a free movement of the lever body. An operating portion attached to the end and partially protruding outside the housing, wherein the operating portion is pushed to displace the operating lever from the stop position toward the driving position. 6. The pneumatic tool according to claim 5, wherein the pneumatic tool is configured to be able to do so .