WO2004096497A1

WO2004096497A1 - Air filter device of compressed air tool

Info

Publication number: WO2004096497A1
Application number: PCT/JP2004/005696
Authority: WO
Inventors: Michiaki Adachi; Tatsushi Ogawa
Original assignee: Max Co., Ltd.
Priority date: 2003-05-02
Filing date: 2004-04-21
Publication date: 2004-11-11
Also published as: JP4120808B2; TW200510137A; JP2004330333A

Abstract

An air filter device of a compressed air tool, wherein a tubular recessed part (34) continued to a suction port (32) is formed in an end cap (22) having the suction port (32) formed therein to lead compressed air from a compressed air supply source into an air chamber (23) formed in the tool, and suction passages (35) having one end opened in the inner peripheral surface of the tubular recessed part (34) and the other end opened in the air chamber (23) is formed in the end cap. A cylindrically formed filter (36) is installed in the tubular recessed part (34) so as to be fitted to the inner peripheral surface of the tubular recessed part (34). The compressed air supplied from the suction port (32) is passed through the filter (36) and supplied into the air chamber (23) via. the suction passage (35).

Description

Air filter device for compressed air tools

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 via an air hose, and in particular, an air hose is detachably connected to the compressed air supply port from a bright compressed air supply hole. The present invention relates to an air filter device for a compressed air tool which prevents foreign matter such as sand and dust from entering the inside of the compressed air tool.

Background art

In the case of a compressed air tool that receives compressed air from a compressed air supply source such as an air compressor through an air hose, a plug is attached to the end of the tool, and a socket attached to the end of the air hose is detachably attached to this plug. Is supplied to the tool. When the compressed air tool is not connected to the compressed air supply, foreign matter such as sand and dust may enter from the compressed air tool plug and the end of the air hose socket. If an air hose is connected to the compressed air tool and activated while sand or the like enters the plug or socket, sand or the like may clog the valve that operates the nailing machine, or may enter the cylinder and cause the piston to move. Failures such as malfunction may occur. Therefore, a compressed air tool provided with an air filter device for preventing foreign matter from entering the air chamber of the compressed air tool is already known.

An air filter device for a compressed air tool described in Japanese Patent No. 2845141 is provided with a ventilation hole for communicating an outer space with the outside in a cylindrical body having one end opened, An air filter unit is formed by attaching a filter such as a mesh wire or a long fiber filter to the air filter unit, and the open end of the air filter unit is connected to the inside of the compressed air injection port provided in the compressed air tool by means of a screw or the like. And housed inside the compressed air tool. According to the air filter device disclosed in the above-mentioned Patent No. 28451543, the air that has flowed into the compressed air injection port of the compressed air tool has a cylindrical shape fitted inside the compressed air injection port. Foreign matter such as sand adhered to the plug and socket is passed through the ventilation hole of the air filter unit and supplied to the working part of the compressed air tool. The compressed air from which the foreign matter has been removed by the filter is supplied to the working part of the compressed air tool.

In the air filter device of the above-mentioned Patent No. 28451443, a filter tub formed in a columnar shape is attached to a compressed air injection port, but a pipe through which compressed air flows is used. In order to reduce the path resistance, the overall volume is increased, and the volume of the air chamber that stores compressed air in the compressed air tool is not reduced.In order to reduce the performance of the tool or increase the compressed air champer volume, There was a problem that the entire tool became large. Also, as the size of the filter unit becomes large, the impact at the time of operation of the compressed air tool causes vibration in the filter fut, which may damage the mounting part to the compressed air injection port or increase the strength. However, there has also been a problem that the weight increases and the cost increases.

Furthermore, large foreign matter such as sand particles caught by the filter can be easily removed by, for example, discharging the air hose from the compressed air tool to the outside when the air hose is removed from the tool. However, the fine dust and the like trapped inside the filter cannot be discharged as described above, and accumulates on the filter, increasing the air flow resistance and reducing the compressed air supply capacity. Eventually, the filter needs to be replaced. In the above-mentioned prior art, 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.

Also, the compressed air tool is equipped with a relief valve that, when abnormally high compressed air is accidentally supplied to the tool, discharges the compressed air to the outside to prevent damage to the tool and unexpected danger. However, such relief valves are typically formed near a compressed air injection port that supplies compressed air to the tool. If a filter unit is mounted inside the compressed air injection port as in the air filter device of the above-mentioned Patent No. 28451443, a relief valve cannot be formed, or a filter is not provided in the compressed air injection port. If the cut and the relief valve are formed in parallel, the shape of the compressed air injection port becomes large. Normally, the compressed air injection port is formed as an end cap at the end of the tool lip, and there is also a problem that the operability is poor due to the large diameter of the grip. Disclosure of the invention

The present invention solves the above problems, and provides an air filter device for a compressed air tool in which a filter can be easily replaced without being damaged by vibration or the like generated when the compressed air tool is operated. The task is to

In order to solve the above-mentioned problems, an air filter device in a compressed air tool according to the present invention includes an end having an air supply hole for introducing compressed air from a compressed air supply source into an air chamber formed in the tool. Forming a cylindrical concave portion in the cap that is continuous with the air supply hole, forming an air supply passage having one end opened to the inner peripheral surface of the cylindrical concave portion and the other end opened to the air chamber; A filter formed in a cylindrical shape in the cylindrical concave portion is attached so as to be in close contact with the inner peripheral surface of the cylindrical concave portion, and compressed air supplied from the air supply hole is transmitted through the filter to pass through the air supply passage. It was supplied to the air chamber.

Further, the cylindrical recess is formed in a sleep formed integrally with the inside of the air chamber of the end cap, and a relief valve for discharging an abnormally high pressure in the air chamber to the atmosphere at an end of the slip. The exhaust path connecting the relief valve and the atmosphere is formed at different angles along the circumferential direction of the sleeve so as not to intersect with the air supply path. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows a nailing machine in which the air filter device according to the first embodiment of the present invention is implemented. FIG.

Fig. 2 is an enlarged longitudinal side view of a part of the nailer shown in Fig. 1.

Fig. 3 is an enlarged cross-sectional plan view of a part of the nailing machine in Fig. 1.

FIG. 4 is a perspective view of an end cap mounted on the nailing machine of FIG. FIG. 5 is a cross-sectional view taken along line A_A in FIG.

FIG. 6 is a perspective view from the rear side of the end cap and the filter of FIG. FIG. 7 is a longitudinal side view of an end cap according to a second embodiment of the present invention. Symbols in the figure, 22 and 44 are end caps, 23 is an air chamber, 24 is an air plug, 32 and 46 are air supply holes, 33 and 49 are sleeves, and 34 and 45 are Cylindrical recess, 3, 4 8 are air supply passages, 3 6, 4 7 are filters, 3 7 is a relief valve, 3 8 is a valve seat, 3 9 is a pressure receiving end, 4 0 is a valve piston, 4 1 Indicates a panel, 42 indicates an exhaust port, and 43 indicates an exhaust path.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described based on the embodiments shown in the drawings.

(First Embodiment)

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 drip portion 11 extending rearward is formed in a hollow body. A striking cylinder 13 is disposed in a housing 12 having a shape, and a striking piston 15 having a driver 14 for striking a nail coupled to a lower surface is slidably accommodated in the striking cylinder 13. Have been. 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 section 17. ing. An opening 18 is formed at the rear side of the injection port 16 of the nose portion 17 to introduce the connecting nails connected to each other into the injection port 16. One side edge of the opening 18 is formed. Continuous A nail supply guide 19 is continuously provided, and a magazine 20 for accommodating a spirally wound connection nail is disposed at a rear portion of the nail supply guide 19. The connecting nails accommodated in the magazine 20 are drawn out of the magazine 20 and are sequentially supplied into the injection port 16 by the nail supply mechanism 21 arranged along the nail supply guide 19. Have been.

The drip portion 11 is formed in a hollow shape with an open rear end. The drip portion 11 is closed by an end cap 22 attached to the rear end of the grip portion 11 so that the inside of the grip portion 11 is formed. It is formed as an air chamber 23. An air plug 24 is attached to the rear side of the end cap 22, and compressed air is supplied by connecting a socket attached to an end of an air hose connected to a compressed air supply source to the air plug 24. It is supplied to the air chamber 23 內 and stored. In FIG. 1, a cap 24 a is attached to an end of the air plug 24. The cap 24 a is attached for the purpose of preventing foreign substances from entering the air plug 24 when the air hose is not connected to the air plug 24. The air hose is connected to the air plug 24 by removing the cap 24a.

A main valve 25 is disposed at an upper end of the impact cylinder 13, and the main valve 25 is formed in the impact cylinder 13 in a nip portion 11 in an air chamber 23 and an exhaust port 26. It is made to selectively connect between. When the main valve 25 connects the inside of the striking cylinder 13 to the air chamber 23, the compressed air in the air chamber 23 is introduced into the striking cylinder 13 and the striking piston 15 is driven downward to strike the striking piston. A driver 14 coupled to 15 strikes and launches the nail supplied in the outlet 16. A trigger valve 27 for controlling the main valve 25 is provided at the root of the grip portion 11. The trigger valve 27 is operated by a manually operable trigger lever 28. And the main pulp 25 is driven so that the cylinder 13 is selectively connected between the air chamber 23 and the exhaust port 26.

As shown in FIG. 2, the end cap 22 is a male cap formed on the outer peripheral surface. The air chamber 2 is screwed into the female screw 30 formed on the inner peripheral surface of the rear end of the drip portion 11 through the claw portion 29 and attached to the grip portion 11. Forming three. A boss 31 extending rearward is formed on the rear side of the end cap 22, and an air supply hole 32 for communicating the inside and outside of the air chamber 23 is formed at the center of the boss 31. An air plug 24 is screwed into the rear end of the air supply hole 32. Compressed air is supplied into the air supply hole 32 through an air hose attached to the air plug 24.

As shown in FIG. 4, an air chamber is provided at the front end j of the end cap 22.

A hollow sleeve 33 bulged into the inside of the body 23 is formed in the body. As shown in FIGS. 2 and 3, a cylindrical concave portion 34 having the same inner diameter as the air supply hole 32 opened at the rear end of the end cap is formed in the sleep 33. I have. The sleep 33 is provided with an air supply passage 35 having one end opened on the inner peripheral surface of the cylindrical concave portion 34 and the other end opened on the outer peripheral surface of the sleeve 33. The compressed air supplied from the hole 32 into the cylindrical recess 34 is introduced into the chamber 23 through the air supply passage 35. The air supply path 3 5 is formed symmetrically in the diameter direction of the sleep 3 3, and two sleeves are formed from the cylindrical recess 3 4.

It is formed to be inclined so as to face forward in the air chamber 23 toward the outer peripheral surface of 33. A filter 36 formed in a cylindrical shape is disposed in the cylindrical concave portion 34 so as to be in close contact with the inner peripheral wall surface of the cylindrical concave portion 34, and an air supply passage 35 is provided from the cylindrical concave portion 34. Compressed air flowing to the filter 36 is filtered by the filter 36. By forming the air supply passage 35 at an angle, the area of the air supply passage 35 that is open to the inner surface of the cylindrical concave portion 34 can be formed large, and compressed air passes through the filter 36. The area can be increased.

At the end of the sleeve 33 disposed in the air chamber 23, when the compressed air pressure in the air chamber 23 rises to a predetermined pressure, the compressed air in the air chamber 23 is discharged to the atmosphere. A relief valve 37 is formed. As shown in FIG. 3, the relief valve 37 is provided with an annular valve seat 38 located inside the sleep 33, and the pressure in the air chamber 23 acting from the open end of the sleeve 33. A valve piston 40 formed with a pressure receiving end 39 exposed to compressed air; and a spring 41 for pressing and biasing the valve piston 40, and a downstream side of the valve piston 40. An exhaust path 43 for connecting the compressed air in the air chamber 23 to the atmosphere through an exhaust port 42 formed in the rear end face of the end cap 22 is formed in the air cap 23. As shown in FIG. 5, two exhaust paths 43 are formed symmetrically in the diameter direction perpendicular to the air supply path 35 so as not to intersect with the air supply path 35. The road 43 is formed so as to be inclined in the direction from the inside of the sleep 33 toward the exhaust port 42.

In the embodiment, the exhaust path 43 and the air supply path 35 are formed two each in a direction shifted by 90 degrees in the sleeve. Or more may be formed.

The valve piston 40 slidably disposed in the sleeve 33 is provided with a valve as shown in FIG. 2 at normal times by the action of compressed air acting on the rear end and the urging force of the panel 41. It is arranged at a position where it sits on the seat 38, thereby shutting off the inside of the air chamber 23 and the exhaust passage 43. When the pressure in the air chamber 23 exceeds a predetermined pressure and rises 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 as shown in FIG. The air chamber 23 is connected to the exhaust path 43 by pushing the valve seat 38 away from the valve seat 38 against the urging force of the spring 41 and the like, and the air chamber 23 is abnormally high. It operates to release compressed air into the atmosphere.

As shown in FIG. 6, the filter 36 is formed in an annular shape by using a generally commercially available filter material such as a plastic having a fine hole, a metal or ceramic, or a long fiber such as synthetic fiber or wool. The cylindrical recess 3 4 formed at the back of the air supply hole 32 by inserting it into the air supply hole 32 from the end of the air supply hole 32 of the end cap 22 from which the air plug 24 has been removed. Install inside. The filter 36 captures foreign matter such as sand and dust attached to the air plug 24 or a socket connected to the air plug 24. Also, when replacing the clogged filter 36, it is easy to replace it by removing the air plug 24. Can be

(Second embodiment)

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 range of 0.98MP & (1 OKg f / cm ² ) or more, and even if the cross-sectional area of the air supply passage 35 is relatively small. Sufficient compressed air could be supplied, but a compressed air tool that operates in a normal pressure range of less than 0.98 MPa (1 OKg f / cm ² ) is sufficient if the cross-sectional area of the air supply passage 35 is small. The compressed air cannot flow in, and the tool performance 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 range.

In this embodiment, the cylindrical recess 45 formed in the end cap 44 attached to the end 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 concave portion 45 formed continuously with the air supply hole 46 to be formed. Further, an air supply path 48 that connects the inside of the cylindrical concave portion 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 sleep 49. A plurality of air supply passages 48 are also formed on the outer periphery of the sleeve 49 along four sides along the circumferential direction, thereby providing an effective passage for flowing compressed air from the cylindrical recess 45 into the air chamber 23. The cross-sectional area is increased.

In the above embodiment, the air supply passage and the filter have been described as having a cylindrical shape.

By forming a large number of air supply passages 48 in this manner, the area of the air supply passage 48 opening on the inner peripheral surface of the cylindrical concave portion 45 increases, and the area through which compressed air passes through the filter 47 also increases. growing. Therefore, even if the flow resistance of the compressed air is small, the compressed air in the normal pressure range 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 is disposed in the air chamber 23. The end of Sleep 49 is closed.

In addition, a configuration may be adopted in which the cross section of the air supply passage is increased, for example, by making the cross section of the air supply passage into an oval shape.

Industrial applicability

As described above, according to the filter device of the present invention, a cylindrical concave portion continuous with the air supply hole is formed in the end cap having the air supply hole for supplying the compressed air, and the inner peripheral surface of the cylindrical concave portion is formed. One end is opened at one end, and the other end forms an air supply passage open to the air chamber, 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. Since the compressed air supplied from the pores is transmitted through the filter and supplied to the air chamber through the air supply path, the air plug is attached to a socket or the like connected to the air plug. Foreign matter such as sand and dust can be reliably captured by the filter.

In addition, when the compressed air in the air chamber of the compressed air tool is discharged from the air supply hole 6 through the air supply passage when the air hose is removed from the compressed air tool, sand particles and the like captured by the filter are removed. It is discharged by the ejection of compressed air. Furthermore, if dust accumulates inside the filter and the filter is clogged, the filter can be easily replaced by removing the air plug from the end cap, making maintenance of the compressed air tool easier. It is.

In addition, since a cylindrical concave portion is formed integrally with the end cap, and a cylindrical filter is mounted in the cylindrical concave portion, screws and the like for mounting the filter are not required, and a tool is used. Can be smaller. In addition, it is possible to reduce the size of the portion disposed on the inner side of the grip portion, to increase the volume of the air chamber in the drip portion, and to sufficiently exert the performance of the compressed air tool.

Further, the cylindrical concave portion is formed in a sleep formed inside the air chamber of the end cap, and a difference in an air chamber is formed in an end of the sleep. A relief valve for discharging a constantly high pressure to the atmosphere is provided, and an exhaust path connecting the relief valve and the atmosphere is different along the circumferential direction of the sleeve so as not to intersect with the air supply path. Since the filter device and the relief valve are formed at an angle, the filter device and the relief valve can be arranged in series with the end cap, the volume of the drip portion in the outer diameter direction can be reduced, and the operability of the tool can be improved. It does not inhibit.

0

Claims

The scope of the claims

1. an end cap that closes the air chamber;

An air supply hole formed in the end cap for introducing compressed air from a compressed air supply source into an air chamber formed in the tool;

A cylindrical recess continuous with the air supply hole;

An air supply path comprising: one end opening to the inner peripheral surface of the cylindrical recess; and the other end opening to the air chamber.

A hollow cylindrical filter mounted so as to be in close contact with the inner peripheral surface of the cylindrical concave portion;

An air filter device for a compressed air tool, comprising:

2. The air according to claim 1, wherein the compressed air supplied from the air supply hole is transmitted from an inner peripheral side to an outer peripheral side of the filter, and is supplied into an air chamber via an air supply path. Filter device.

3. Furthermore,

A sleeve formed integrally with the end cap and formed toward an inner side of the air chamber;

A relief valve provided at an end of the sleep for discharging an abnormally high pressure in the air chamber to the atmosphere;

An exhaust path formed along the circumferential direction of the sleeve so as not to intersect with the air supply path and connecting between the relief valve and the atmosphere;

The air filter device according to claim 1, comprising:

4. The air filter device according to claim 3, wherein the cylindrical concave portion is formed in a sleeve.

5. The air filter device according to claim 4, wherein the air supply path is formed so as to be inclined from the inside of the cylindrical recess toward the outer peripheral surface of the sleeve toward the distal end of the sleeve.

6. The air filter device according to claim 4, wherein a plurality of air supply passages are formed in parallel along a longitudinal direction of the sleeve.

7. A compressed air tool comprising the air filter device according to claim 1.