JP4120808B2 - Air filter device in compressed air tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a compressed air tool that is operated by compressed air supplied from a compressed air supply source such as an air compressor through an air hose, and particularly sand from a compressed air supply hole to which the air hose is detachably connected. The present invention relates to an air filter device in a compressed air tool that prevents foreign matters such as dust and dust from entering the inside of the compressed air tool.
[0002]
[Prior art]
In a compressed air tool that receives compressed air supply from a compressed air supply source such as an air compressor through a hose, a plug is attached to the end of the tool, and a socket attached to the end of the hose is detachable so that compressed air is supplied. Supply to the tool. When the compressed air tool is not connected to the compressed air supply source, foreign substances such as sand and dust may enter from the ends of the plug of the compressed air tool and the socket of the air hose. And if sand or the like is inserted into the plug or socket and operated by connecting the hose to the compressed air tool, the sand or the like will clog the valve that operates the nailing machine, or the piston may malfunction due to entry into the cylinder. May cause malfunctions. Therefore, a compressed air tool provided with an air filter device in order to prevent foreign substances from entering the air chamber of the compressed air tool is already known.
[0003]
A conventional air filter device for a compressed air tool is provided with a vent hole communicating with an internal space and the outside in a cylinder body whose one end is open, and a filter such as a mesh wire or a long fiber filter is provided in the cylinder body. The air filter unit is formed by mounting, and the open end of the air filter unit is fastened to the inside of the compressed air tool by a connecting means such as a screw inside the compressed air injection port provided in the compressed air tool. Contained. (For example, refer to Patent Document 1).
[0004]
According to the above prior art, the air that has flowed into the compressed air injection port of the compressed air tool passes through the vent hole of the cylindrical air filter unit that is fitted inside the compressed air injection port. The foreign material such as sand, which is supplied to the operating part and adheres to the plug or socket part, is captured by the filter installed in the air filter unit when the compressed air passes through the vent, and the foreign substance is removed. Air is supplied to the working part of the compressed air tool.
[0005]
[Patent Document 1]
Japanese Patent No. 2845143 [0006]
[Problems to be solved by the invention]
In the above prior art, a filter unit formed in a columnar shape is attached to the compressed air injection port. However, the entire volume increases in order to reduce the pipe resistance through which the compressed air flows, and the compressed air The volume of the air chamber in which compressed air is accumulated in the tool has been reduced, and there has been a problem that the overall size of the tool is increased in order to reduce the performance of the tool or increase the compressed air chamber volume. In addition, due to the large filter unit, the shock when the compressed air tool is operated causes vibrations in the filter unit and damages the mounting part to the compressed air injection port, or the weight is increased to increase the strength. There was a problem of increasing the cost and cost.
[0007]
Furthermore, large foreign matters such as sand particles captured by the filter can be easily taken out by, for example, discharging the air hose from the compressed air tool to the outside when the air hose is removed from the tool. The fine dust trapped inside cannot be discharged as described above, and accumulates on the filter, increasing the air flow resistance and reducing the compressed air supply capability. I need it. In the prior art described above, it is necessary to remove the compressed air injection port from the tool and further remove the filter unit from the compressed air injection port, and there is a problem that it takes time to replace the filter.
[0008]
In addition, the compressed air tool is provided with a relief valve that discharges this compressed air to the outside to prevent damage to the tool and unexpected dangers when abnormally high compressed air is accidentally supplied to the tool. Such relief valves are generally formed in the vicinity of a compressed air injection port that supplies compressed air to the tool. If the filter unit is attached to the inside of the compressed air injection port as in the prior art, a relief valve cannot be formed, or if the filter unit and the relief valve are formed in parallel at the compressed air injection port, the compressed air is formed. The shape of the injection port becomes large. The compressed air injection port is usually formed as an end cap at the end of the grip portion of the tool, and there is a problem that the diameter of the grip portion becomes large and the operability becomes poor.
[0009]
The present invention solves the above-mentioned problems in the prior art, and there is no risk of breakage due to vibration or the like generated during operation of the compressed air tool, and the air filter device in the compressed air tool can be easily replaced. It is an issue to provide.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, an air filter device in a compressed air tool according to the present invention is formed at the end of an air chamber in a tool in a compressed air tool that receives compressed air supply from a compressed air supply source via a hose . A sleeve integrally formed toward the inner side of the air chamber is formed in the end cap, and an air supply hole for introducing compressed air from a compressed air supply source into the air chamber and the sleeve are formed in the sleeve. Forming a cylindrical recess continuous with the air supply hole, and forming an air supply path having one end opened in the inner peripheral surface of the cylindrical recess and the other end opened in the air chamber in the diameter direction of the sleeve , A filter formed in a hollow cylindrical shape in a cylindrical recess is attached so as to be in close contact with the inner peripheral surface of the cylindrical recess, and the compressed air supplied from the air supply hole is transmitted from the hollow to the outer peripheral side of the filter. The Is via the air path, characterized in that so as to be supplied to the air chamber.
[0011]
According to a second aspect of the present invention, there is provided a compressed air tool that is supplied with compressed air from a compressed air supply source through a hose, and an end cap formed at an end of the air chamber in the tool is connected to the inside of the air chamber. A sleeve integrally formed toward the side, an air supply hole for introducing the compressed air from the compressed air supply source into the air chamber, and a cylindrical recess continuous to the air supply hole, in the sleeve An air supply path having one end opened on the inner peripheral surface of the cylindrical recess and the other end opened in the air chamber is formed in the diameter direction of the sleeve, and is formed into a hollow cylinder in the cylindrical recess. The formed filter is mounted so as to be in close contact with the inner peripheral surface of the cylindrical recess, and the compressed air supplied from the air supply hole is transmitted from the hollow inside of the filter to the outer peripheral side to pass through the air supply path. I will feed it into the chamber In addition, a relief valve for discharging an abnormally high pressure in the air chamber to the atmosphere is provided at the end of the sleeve, and an exhaust passage connecting the relief valve and the atmosphere is provided in the diameter direction of the sleeve. It is formed .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the embodiments shown in the drawings. FIG. 1 shows a nailing machine 10 as an example of a compressed air tool driven by compressed air in which a filter device according to the present invention is implemented, and a hollow housing integrally formed with a grip portion 11 extending rearward. A striking cylinder 13 is disposed in the striking cylinder 13, and a striking piston 15 in which a driver 14 for striking a nail is coupled to the lower surface is slidably accommodated in the striking cylinder 13. A nose portion 17 forming a hollow injection port 16 is attached below the housing 12, and the driver 14 is slidably guided into the injection port 16 of the nose portion 17. An opening 18 is formed on the rear side of the injection port 16 of the nose portion 17 so as to introduce the connecting nails connected to each other into the injection port 16. A nail is continuously formed on one side edge of the opening 18. A supply guide 19 is continuously provided, and a magazine 20 is disposed in the rear portion of the nail supply guide 19 to accommodate a connecting nail wound in a spiral shape. The connecting nails accommodated in the magazine 20 are pulled out from the magazine 20 and sequentially supplied into the injection port 16 by a nail supply mechanism 21 arranged along the nail supply guide 19.
[0013]
The grip portion 11 is formed in a hollow shape with an open rear end, and is closed by an end cap 22 attached to the rear end portion of the grip portion 11 so that the inside of the grip portion 11 is formed as an air chamber 23. Has been. An air plug 24 is attached to the rear side of the end cap 22. By connecting a socket attached to the end of a hose connected to a compressed air supply source to the air plug 24, the compressed air enters the air chamber 23. Supplied and stored.
[0014]
A main valve 25 is disposed at the upper end of the impact cylinder 13, and the main valve 25 selectively connects the interior of the impact cylinder 13 between the air chamber 23 formed in the grip portion 11 and the exhaust port 26. Have been to. The main valve 25 connects the inside of the striking cylinder 13 to the air chamber 23 so that the compressed air in the air chamber 23 is introduced into the striking cylinder 13 and the striking piston 15 is driven downward to be coupled to the striking piston 15. The driver 14 strikes the nail supplied into the injection port 16 and drives it out. A trigger valve 27 for controlling the main valve 25 is disposed at the base portion of the grip portion 11, and the trigger valve 27 is operated by operating a trigger lever 28 that can be manually operated to strike the main valve 25. The cylinder 13 is operated so as to selectively connect the air chamber 23 and the exhaust port 26.
[0015]
As shown in FIG. 2, the end cap 22 is screwed to a female screw 30 formed at the rear end portion of the grip portion 11 via a male screw portion 29 formed on the outer peripheral surface, and is attached to the grip portion 1. An air chamber 23 is formed inside the grip portion 11. A boss portion 31 extending rearward is integrally formed on the rear side of the end cap 22, and an air supply hole 32 that communicates the inside and outside of the air chamber 23 is formed at the center of the boss portion 31. An air plug 24 is screwed to the rear end of 32. Compressed air is supplied into the air supply hole 32 through an air hose attached to the air plug 24.
[0016]
As shown in FIG. 4, a hollow sleeve 33 bulging into the air chamber 23 is integrally formed on the front side of the end cap 22. A cylindrical recess 34 is formed which has a continuous inner diameter substantially the same as the air supply hole 32 opened at the end. The sleeve 33 is formed with an air supply passage 35 having one end opened on the inner peripheral surface of the cylindrical recess 34 and the other end opened on the outer peripheral surface of the sleeve 33. The compressed air supplied to the inside is introduced into the air chamber 23 through the air supply path 35. Two air supply passages 35 are formed symmetrically in the diameter direction of the sleeve 33, and are formed so as to be inclined from the inside of the cylindrical concave portion 34 toward the outer peripheral surface of the sleeve 33 so as to be directed forward in the air chamber 23. Has been. A filter 36 formed in a cylindrical shape is disposed in the cylindrical recess 34 so as to be in close contact with the inner peripheral wall surface of the cylindrical recess 34, and compressed air flowing from the cylindrical recess 34 to the air supply path 35 is supplied. Filtering is performed by the filter 36. By forming the air supply path 35 in an inclined manner, the area of the air supply path 35 opened to the inner surface of the cylindrical recess 34 can be increased, and the area through which the compressed air passes through the filter 36 is increased. be able to.
[0017]
In the embodiment, two exhaust passages 34 and two supply passages 35 are formed in a direction shifted 90 degrees in the sleeve. However, for example, three pieces may be formed by shifting 60 degrees.
[0018]
At the end of the sleeve 33 arranged in the air chamber 23, there is a relief valve 37 for discharging the compressed air in the air chamber 23 to the atmosphere when the compressed air pressure in the air chamber 23 rises to a predetermined pressure. Is formed. As shown in FIG. 3, the relief valve 37 has an annular valve seat 38 disposed in the sleeve 33, a pressure receiving end that is exposed to compressed air in the air chamber 23 that acts from the open end of the sleeve 33. The valve piston 40 in which the portion 39 is formed and a spring 41 that presses and biases the valve piston 40, and the compressed air in the air chamber 23 is connected to the end cap 22 on the downstream side of the valve piston 40. An exhaust passage 43 is formed by being connected to the atmosphere via an exhaust port 42 formed in the rear end surface. As shown in FIG. 5, two exhaust passages 43 are formed symmetrically in the diameter direction perpendicular to the air supply passage 35 so as not to intersect the air supply passage 35. It is formed to be inclined in the outer diameter direction from the inside of the sleeve 33 toward the exhaust port 42.
[0019]
The valve piston 40, which is slidably disposed in the sleeve 33, normally has a valve seat 38 as shown in FIG. 2 due to the action of compressed air acting on the rear end and the biasing force of the spring 41. It arrange | positions in the position where it seats, and the inside of the air chamber 23 and the exhaust path 43 are interrupted | blocked by this. When the pressure in the air chamber 23 exceeds a predetermined pressure and increases to an abnormal pressure, the compressed air of this pressure acts on the pressure receiving end 39 of the valve piston 40 to cause the valve piston 40 to move to the spring 41 as shown in FIG. The compressed air, which has an abnormally high pressure in the air chamber 23, is connected to the exhaust passage 43 by pressing it so as to move away from the valve seat 38 against the urging force caused by the above. Operates to release.
[0020]
As shown in FIG. 6, the filter 36 is formed in an annular shape by a generally commercially available filter material such as a filter made of plastic, metal or ceramic having fine holes, or a long fiber such as synthetic fiber or wool. Then, the air plug 24 is inserted into the air supply hole 32 from the end of the air supply hole 32 of the end cap 22 and mounted in the cylindrical recess 34 formed in the inner part of the air supply hole 32. The filter 36 captures foreign matters such as sand and dust attached to the air plug 24 or a socket connected to the air plug 24. Further, when replacing the clogged filter 36, it can be easily replaced by removing the air plug 24.
[0021]
Next, another embodiment of the present invention shown in FIG. 7 will be described. The above-described embodiment is mainly applied to a compressed air tool that operates in a high pressure region, and even if the cross-sectional area of the air supply passage 35 is relatively small, sufficient compressed air can be supplied. In a compressed air tool that operates in the pressure region, if the cross-sectional area of the air supply passage 35 is small, sufficient compressed air cannot flow in and the performance of the tool cannot be fully exhibited. The embodiment shown in FIG. 7 is particularly applicable to a compressed air tool that operates with compressed air in a normal pressure region.
[0022]
In this embodiment, the cylindrical recess 45 formed in the end cap 44 attached to the end portion of the grip portion 11 of the nailing machine is formed slightly longer than in the above-described embodiment, and the air plug 24 is attached. An annular filter 47 is mounted in the cylindrical recess 45 formed continuously with the air supply hole 46. Further, an air supply path 48 communicating the inside of the cylindrical recess 45 and the inside of the air chamber 23 is formed in parallel with a plurality of air supply paths 48 along the longitudinal direction of the sleeve 49. The air supply passage 48 is formed on the outer periphery of the sleeve 49 in all directions along the circumferential direction, thereby increasing the effective cross-sectional area of the flow passage for allowing the compressed air to flow from the cylindrical recess 45 into the air chamber 23. is doing.
[0023]
In the above-described embodiment, the air supply passage and the filter have been described as being cylindrical, but are not limited to a circular shape, and may be a polygonal cylindrical shape.
[0024]
By forming a large number of the air supply passages 48 in this way, the area of the openings where the air supply passages 48 open on the inner peripheral surface of the cylindrical recess 45 is increased, and the area through which the compressed air passes through the filter 47 is also increased. growing. Accordingly, the flow resistance of the compressed air is reduced, and even compressed air in the pressure range of the normal pressure can be sufficiently supplied to the air chamber 23. Further, in this embodiment, the relief valve mounted in the above-described embodiment is eliminated, and the end portion of the sleeve 49 disposed in the air chamber 23 is closed.
[0025]
Further, the cross section of the air supply path may be increased, for example, by making it oval.
[0026]
【The invention's effect】
As described above, according to the filter device of the present invention, the cylindrical recess that is continuous with the air supply hole is formed in the end cap in which the air supply hole for supplying the compressed air is formed, and the inner periphery of the cylindrical recess is formed. An air supply path having one end opened on the surface and the other end opened in the air chamber is formed, and a filter is mounted in the cylindrical recess so as to be in close contact with the inner peripheral surface of the cylindrical recess. Compressed air supplied from the air is passed through the filter and supplied to the air chamber through the air supply path, so that the sand that has adhered to the air plug, the socket connected to the air plug, etc. Foreign matter such as dust can be reliably captured by the filter.
[0027]
Further, when the compressed air in the air chamber of the compressed air tool when removing the air hose from the compressed air tool is discharged al or air supply hole via the air supply passage, sand or the like captured by the filter is compressed Discharged by air blast. Furthermore, if dust or the like accumulates inside the filter and the filter becomes clogged, the filter can be easily replaced by removing the end cap from the air plug, and maintenance of the compressed empty tool is easy. is there.
[0028]
In addition, a cylindrical recess is formed integrally with the end cap, and a filter formed in a cylindrical shape is mounted in the cylindrical recess, so that a screw or the like for attaching the filter is not required, and the tool is small. can do. In addition, it is possible to make the portion arranged on the inner side of the grip portion small, the volume of the air chamber in the grip portion can be increased, and the performance of the compressed air tool can be sufficiently exhibited.
[0029]
According to a second aspect of the invention, the cylindrical recess is formed in a sleeve formed inside the air chamber of the end cap, and an abnormally high pressure in the air chamber is applied to the end of the sleeve. A relief valve is provided for discharging to the outside, and an exhaust passage connecting the relief valve and the atmosphere is formed in the diameter direction of the sleeve, so that the filter device and the relief valve are arranged in series with the end cap. The volume of the grip portion in the outer diameter direction can be reduced, and the operability of the tool is not hindered.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a nailing machine in which the air filter device of the present invention is implemented. FIG. 2 is an enlarged vertical side view of a part of the same nailing machine as in FIG. 1. FIG. FIG. 4 is a perspective view of an end cap mounted on the nailing machine of FIG. 1. FIG. 5 is a cross-sectional view taken along the line AA in FIG. FIG. 7 is a perspective view from the rear side. FIG. 7 is a vertical side view of an end cap according to another embodiment of the present invention.
22, 44 End cap 23 Air chamber 24 Air plug 32, 46 Air supply hole 33, 49 Sleeve 34, 45 Cylindrical recess 35, 48 Air supply path 36, 47 Filter 37 Relief valve 38 Valve seat 39 Pressure receiving end 40 Valve piston 41 Spring 42 Exhaust port 43 Exhaust path

Claims (2)

In a compressed air tool that is supplied with compressed air from a compressed air supply source through a hose, an end cap formed at the end of the air chamber in the tool is integrally formed toward the inner side of the air chamber. A sleeve is formed, and an air supply hole for introducing compressed air from a compressed air supply source into the air chamber and a cylindrical recess continuous with the air supply hole are formed in the sleeve. An air supply path having one end opened in the inner peripheral surface and the other end opened in the air chamber is formed in the diameter direction of the sleeve, and a filter formed in a hollow cylindrical shape in the cylindrical recess is formed in the cylindrical recess. Attached so as to be in close contact with the inner peripheral surface, the compressed air supplied from the air supply hole is transmitted from the hollow inside of the filter to the outer peripheral side, and supplied to the air chamber through the air supply path. Characterized by Air filter device in compressed air tool. In a compressed air tool that is supplied with compressed air from a compressed air supply source through a hose, an end cap formed at the end of the air chamber in the tool is integrally formed toward the inner side of the air chamber. A sleeve is formed, and an air supply hole for introducing compressed air from a compressed air supply source into the air chamber and a cylindrical recess continuous with the air supply hole are formed in the sleeve. An air supply path having one end opened in the inner peripheral surface and the other end opened in the air chamber is formed in the diameter direction of the sleeve, and a filter formed in a hollow cylindrical shape in the cylindrical recess is formed in the cylindrical recess. It is mounted so as to be in close contact with the inner peripheral surface, and the compressed air supplied from the air supply hole is transmitted from the hollow inside of the filter to the outer peripheral side to be supplied into the air chamber through the air supply path. , A relief valve provided to an abnormal high pressure in the air chamber to the end of the over blanking discharged into the atmosphere, that the exhaust passage which connects between the relief valve and the atmosphere was formed in the diameter direction of the sleeve An air filter device in a compressed air tool.

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