JP4039371B2 - Compressed air tool end cap - Google Patents

Description

  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 particularly when the air hose is attached to and detached from the compressed air tool. A dust-proof filter device that prevents foreign substances such as sand and dust from entering the inside of the compressed air tool from the pores, and releases the pressure to the atmosphere when the pressure supplied to the compressed air tool exceeds a predetermined pressure The present invention relates to an end cap of a compressed air tool in which a relief valve is formed.

  In a compressed air tool in which compressed air is supplied from a compressed air supply source such as an air compressor via an air hose, an air plug is attached to an end cap attached to an end of a grip portion for gripping the tool, and the air plug is attached to the air plug. A socket attached to the end of the air hose is detachable so that compressed air is supplied to the tool. When the compressed air tool is not connected to the compressed air supply source, foreign objects such as sand and dust may enter from the ends of the compressed air tool air plug and the air hose socket. When an air hose is connected to a compressed air tool and operated while sand is entering, sand or the like may clog the valve that operates the compressed air tool, or may enter the cylinder and cause malfunction such as malfunction of the piston. There is. Therefore, a compressed air tool provided with a dustproof filter device in order to prevent entry of foreign matter into an air chamber formed inside the compressed air tool is already known.

A conventional dustproof filter device for a compressed air tool has a cylindrical surface of a cylindrical body, one end of which is open, formed with a vent hole that communicates the internal space of the cylindrical body with the outside, and a mesh wire inside the cylindrical body. Alternatively, a filter unit such as a long fiber filter is accommodated to form a filter unit, and the filter is placed inside the tool of the compressed air supply port formed in the end cap attached to the end of the grip portion of the compressed air tool. The open end of the unit is fastened through a coupling means such as a screw and is accommodated in the air chamber of the compressed air tool. According to the above prior art, the compressed air supplied to the compressed air supply port of the compressed air tool passes through the vent hole of the cylindrical filter unit fitted on the inner side of the compressed air supply port, and the air chamber It is introduced into and supplied to the working part of the compressed air tool. At this time, foreign matters such as sand adhering to the plug and the socket are captured by the filter material mounted in the filter unit when the compressed air passes through the vent hole, and the compressed air from which the foreign matters are removed is collected. It is made to supply to the action | operation part of a compressed air tool.
Japanese Patent No. 2845143

Also, in such a compressed air tool that is normally operated by compressed air, an air chamber for storing compressed air supplied from a compressed air supply source is formed inside the tool, and abnormally high compressed air is generated. In order to prevent damage to the compressed air tool due to this high pressure or other unexpected hazards if accidentally fed into the air chamber of the compressed air tool, this abnormally high pressure compressed air is automatically In addition, a relief valve is provided which is discharged to the outside of the compressed air tool. Such a relief valve is generally formed in an end cap that forms a compressed air supply port.
Japanese Utility Model Publication No. 7-17480

  In the above prior art, the filter unit is formed in a cylindrical body shape and attached to the compressed air supply port inside the end cap, but the compressed air supplied to the compressed air supply port enters the air chamber. In order to reduce the resistance to flow, the overall volume is made large. For this reason, the volume of the air chamber for storing the compressed air in the compressed air tool is reduced, and the performance of the compressed air tool is lowered. There is a problem that the entire tool becomes large due to the increase in the volume of the compressed air chamber in order to maintain the performance. 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 supply port, or the weight is increased to increase the strength. There was a problem of increasing the cost and cost.

  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. As described above, fine dust and the like captured inside the filter cannot be discharged as described above, and accumulate in the filter, resulting in increased air flow resistance and reduced compressed air supply capacity. The filter needs to be replaced. In the above prior art, it is necessary to remove the compressed air supply port from the tool and further remove the filter unit from the compressed air supply port, which has a problem that it takes time to replace the filter.

  Further, if a filter unit for dust prevention is attached inside the compressed air supply port formed in the end cap as in the prior art, a relief valve that exhausts abnormally high pressure in the air chamber to the atmosphere cannot be formed. If the filter unit and the relief valve are formed in parallel on the end cap, the shape of the end cap becomes large. Since the end cap is usually attached to the end of the grip part of the tool, the larger end cap makes the outer diameter of the grip part larger and the operability of gripping the compressed air tool becomes poor. There was also a problem of end.

  The present invention provides a dustproof filter device that solves the above-described problems in the prior art and that can be easily replaced without the risk of damage caused by vibrations or the like generated during operation of a compressed air tool. Is an issue. It is another object of the present invention to provide an end cap for a compressed air tool that can incorporate a filter and a relief valve into the end cap without enlarging the end cap.

  In order to achieve the above object, the end cap of the compressed air tool of the present invention is formed with an air chamber for storing compressed air in the tool, and the other end of the hose connected to the compressed air supply source is attached and detached. A compressed air tool having an end cap that is freely connected and driven by compressed air supplied into the air chamber via the end cap, the tool for isolating the air chamber from the atmosphere An air supply port formed with a sleeve-like opening that allows the inside and outside of the air chamber to communicate with the end cap attached to the end cap, and is formed into a cylindrical shape with one end open, and the other end side penetrates the inside and outside of the filter case And a filter case containing a dust filter inside is disposed in the opening so that the air supply port is exposed in the air chamber. A hollow shape in which the filter case is mounted in the opening from the rear side of the end cap so that an O-ring mounted on the outer peripheral surface of the filter case is brought into close contact with a seal seat formed at the end of the opening to form a seal. An end cap for a compressed air tool, characterized in that the end cap is arranged and attached to the end of the opening by means of a plug housing.

  According to a second aspect of the present invention, an exhaust passage is formed in the end cap to allow communication between the inside of the air chamber and the atmosphere, and a filter case is slidably disposed within the opening, and the air is passed through the filter case. When compressed air in the normal pressure range that drives the compressed air tool is supplied by causing the compressed air in the chamber to act and press backward, the filter case resists the pressing force of this compressed air An urging means for urging the filter case forward is provided so that the filter case is disposed at the front end position.When compressed air exceeding a normal pressure range is supplied, the filter case is moved by the compressed air pressure. By sliding the O-ring away from the seal seat, the compressed air in the air chamber is discharged to the atmosphere via the exhaust passage. Characterized in that the

  According to a third aspect of the present invention, an air chamber for storing compressed air is formed in the tool, and the other end of the hose whose one end is connected to the compressed air supply source is detachably connected. In a compressed air tool comprising a cap and driven by compressed air supplied into the air chamber via the end cap, an air is applied to the end cap mounted on the tool so as to shut off the air chamber from the atmosphere. A sleeve-like opening that communicates the inside and outside of the chamber is formed, and is formed into a cylindrical shape with one end open, and an air supply port that penetrates the inside and outside of the filter case is formed at the other end, and a dustproof filter is further provided inside The filter case containing the filter is disposed in the opening so that the air supply port is exposed in the air chamber, and the filter case is formed at the end of the opening. It brought in close contact with the sealing seat and is located at the end of the opening from the rear side by the hollow plug housing mounted in the opening of the end cap to form a seal, characterized in that mounted to.

  Furthermore, the invention of claim 4 further includes an exhaust passage formed in the end cap to allow communication between the air chamber and the atmosphere, and a filter case is slidably disposed in the opening. When the compressed air in the normal pressure range for driving the compressed air tool is supplied, the filter case and the filter case are resisted against the pressing force by the compressed air. By releasing the seal with the seal seat, the compressed air in the air chamber is discharged to the atmosphere via the exhaust passage.

  According to the first and third aspects of the present invention, a sleeve-like opening is formed in which the inside and outside of the air chamber communicate with the end cap attached to the tool so as to block the inside of the air chamber from the atmosphere. The air supply port is formed in a cylindrical shape with one end opened and an air supply port that penetrates the inside and outside of the filter case is formed on the other end side, and a dustproof filter is accommodated inside the air supply port. A plug housing that is disposed in the opening so as to be exposed, and is mounted in the opening from the rear side of the end cap so as to form a seal by closely contacting the filter case with a seal seat formed at an end of the opening. Since it is installed at the end of the opening by the filter, foreign matter such as sand and dust attached to the air plug and the socket connected to the air plug is filtered. Therefore to ensure capture, it is possible to these sand and dust can be prevented from being supplied to the drive unit. In addition, if dust or the like accumulates inside the filter and the filter becomes clogged, the filter can be easily replaced by removing the air plug from the end cap, and maintenance of the compressed air tool is easy. is there. In addition, an O-ring is attached to the outer peripheral surface of the filter case, and the O-ring is brought into close contact with a seal seat formed at the end of the opening to form a seal, thereby attaching the filter case to the end cap. No screws or the like are required and the tool can be made small.

  According to the invention of claim 2 and claim 4, the end cap is formed with an exhaust passage for communicating between the air chamber and the atmosphere, and the filter case is slidably disposed in the opening. Then, the compressed air in the air chamber is applied to the filter case to press it backward, and when compressed air in a normal pressure range for driving the compressed air tool is supplied, the compressed air is pushed by the compressed air. An urging means is provided for pressing and urging the filter case forward so that the filter case is disposed at the front end position against the pressure. When compressed air exceeding the normal pressure range is supplied, this compression is applied. The filter case is slid by air pressure to separate the O-ring from the seal seat, thereby allowing compressed air in the air chamber to pass through the exhaust passage. Since the filter case is operated as a relief valve, the filter device for dust prevention and the relief valve mechanism for safety are maintained with the volume in the outer diameter direction of the grip portion kept small by operating the filter case as a relief valve. It can be formed and does not hinder the operability of the tool.

  It is an object of the present invention to incorporate a dust-proof filter device that can be easily replaced without increasing the shape of the end cap, and a relief valve that exhausts abnormally high pressure in the air chamber. The end cap is formed with an opening that allows the inside and outside of the air chamber to communicate with each other, and is formed into a cylindrical shape with one end opened, and an air supply port is formed through the inside and outside of the filter case on the other end. A filter case containing a dust filter is disposed in the opening so that the air supply port is exposed in the air chamber, and an O-ring mounted on the outer peripheral surface of the filter case is attached to the opening of the opening. Plug housing mounted in the opening from the rear side of the end cap so as to form a seal in close contact with the seal seat formed at the end Thus it is obtained by achieved by mounting by disposed at the end of the opening, illustrating a further specific examples below.

  FIG. 1 shows a nailing machine 1 as an example of a compressed air tool driven by compressed air according to an embodiment of the present invention. The nailing machine 1 includes a housing 2 formed in a hollow shape. The nailing machine 1 includes a striking cylinder 3 and a striking piston 4 slidably accommodated in the striking cylinder 3. A striking mechanism is housed. A driver 5 for striking a nail is integrally coupled to the lower surface side of the striking piston 4, and this driver 5 is inserted into an injection port 7 formed in a nose portion 6 attached below the housing 2. It is slidably guided. An opening 8 is formed on the rear side of the injection port 7 of the nose portion 6 so as to introduce the connecting nails connected to each other into the injection port 7. A nail is continuously formed on one side edge of the opening 8. A supply guide 9 is provided in series, and a magazine 10 is disposed in the rear part of the nail supply guide 9 to accommodate a connecting nail wound in a spiral shape. The connecting nails accommodated in the magazine 10 are pulled out from the magazine 10 and sequentially supplied into the injection port 7 by a nail supply mechanism 11 arranged along the nail supply guide 9.

  The housing 2 is integrally formed with a hollow grip portion 12 extending rearward for gripping and operating the nail driver 1, and the inside of the grip portion 12 is supplied from a compressed air supply source. It is formed as an air chamber 13 for storing compressed air. A main valve 14 is disposed at the upper end of the impact cylinder 4, and the main valve 14 selectively connects the interior of the impact cylinder 4 between the air chamber 13 formed in the grip portion 12 and the exhaust port 15. Have been to. When the main valve 14 connects the inside of the striking cylinder 4 to the air chamber 13, the compressed air in the air chamber 13 is introduced into the striking cylinder 4, and the striking piston 15 is driven downward to be coupled to the striking piston 15. The driver 5 strikes the nail supplied into the injection port 7 and drives it out. A trigger valve 16 for controlling the main valve 14 is disposed at the base of the grip portion 12, and the trigger valve 16 is operated by a trigger lever 17 that can be operated by a finger of a hand holding the grip portion 12. Then, the main valve 14 is operated so that the striking cylinder 4 is selectively connected between the air chamber 13 and the exhaust port 15.

  An end cap 18 is attached to the open rear end of the hollow grip portion 12, and the end cap 18 has a male screw portion 19 formed on the outer peripheral surface of the end cap 18 as a rear end of the grip portion 12. It is attached to the grip part 12 by being screwed into a female screw 20 formed on the inner peripheral surface of the part, and the air chamber 13 is formed inside the grip part 12 by this end cap 18. 2 and 3, a filter case 21 is provided inside the air chamber 13 of the end cap 18, and an air plug for detachably connecting an air hose connected to a compressed air supply source is provided on the rear side. A plug holder 22 for mounting is formed. Further, the end cap 18 is formed with a two-sided width 23 for engaging a tool such as a spanner when the end cap 18 is screwed into the grip portion 12.

  As shown in FIGS. 4 and 5, the end cap 18 is formed with an opening 24 in the front-rear direction so as to penetrate the inside and outside of the air chamber 13, and on the front end side of the opening 24, that is, on the air chamber 13 side. An inner flange portion 25 having a reduced inner diameter is formed at the portion to be disposed. A filter case 21 that houses a dustproof filter 26 that filters the compressed air supplied into the air chamber 13 and captures solid components such as sand and dust is disposed in the opening 24. An outer flange portion 27 having an enlarged diameter is formed on the outer peripheral surface on one end side of the filter case 21, and an O-ring 28 attached to the base portion of the outer flange portion 27 on the outer peripheral surface of the filter case 21. The inner side and the outer side of the air chamber 13 of the end cap 18 are sealed by being in close contact with the seal seat 29 formed in the inner flange portion 25 of the opening 24 of the end cap 18. The filter case 21 is formed in a cylindrical shape with one end opened, and a plurality of air supply ports 30 are formed so as to communicate the inside and outside of the filter case 21 with the end surface on the other end side and the cylindrical wall surface. The compressed air supplied to one end side of the filter case 21 is supplied into the air chamber 13 through the air supply port 30. When the compressed air supplied to the open end side of the filter case 21 is supplied into the air chamber 13 via the air supply port 30, it passes through the dustproof filter 26 disposed in the filter case 21 and is dustproof. The filter 26 captures sand, dust and the like, and prevents these foreign substances from being supplied into the air chamber 13.

  The filter case 21 releases the compressed air or the like in the air chamber 13 to the atmosphere when the pressure of the compressed air or the like supplied into the air chamber 13 becomes higher than the normal pressure for driving the nailer 1. The relief valve is configured to operate. For this reason, the filter case 21 is slidably disposed in a sleeve-like opening 24 formed in the end cap 18, and is screwed into the opening 24 from the rear side of the end cap 18. The filter case 21 is pressed and biased forward by the elasticity of the spring 32 disposed between the hollow plug housing 31 and the outer flange portion 27 formed on the outer peripheral surface of the filter case 21. Is in contact with an inner flange portion 25 formed at the end of the opening 24 to define the rear position of the filter case 21, and an O-ring 28 attached to the outer peripheral surface of the filter case 21 at this position. It is seated on a seal seat 29 formed on the inner flange portion 25 of the opening 24 to seal the inside and outside of the air chamber 13.

  A cylindrical portion 33 is integrally formed on the rear end side of the filter case 21, and an O-ring 34 formed on the front end side of the plug housing 31 is fitted to the inner peripheral surface of the cylindrical portion 33. A diameter difference is formed by the inner diameter of the cylindrical portion 33 to which the O-ring 34 is fitted and the outer diameter of the O-ring 28 attached to the outer peripheral surface of the filter case 21, The compressed air supplied into the chamber 13 acts on the diameter difference portion to press the filter case 21 backward, that is, in a direction to separate the O-ring 28 from the seal seat 29. The pressure of the spring 32 that presses the filter case 21 forward is compressed air pressure in the normal pressure region that drives the nailing machine 1 acts on the diameter difference portion to press the filter case 21 backward. The filter case 21 is normally arranged on the front side by the biasing force of the spring 32, and the O-ring 28 is in close contact with the seal seat 29 to seal the air chamber 13 and the atmosphere hermetically. It is placed in the position. When the pressure in the air chamber 13 exceeds the normal pressure range in which the nailing machine 1 is operated, this pressure acts on the diameter difference portion, and the filter case 21 resists the biasing force of the spring 32 and moves backward. The O-ring 28 is moved away from the seal seat 29, and the inside of the air chamber 13 is communicated with the atmosphere so that the high-pressure compressed air in the air chamber 13 is exhausted.

  As shown in FIGS. 6 and 7, a female screw 35 for screwing the plug housing 31 is formed on the rear side of the opening 24 formed in the end cap 18. A plug housing 31 in which a male screw 36 to be joined is formed on the outer peripheral surface is screwed and attached to the end cap 18. A groove-shaped exhaust passage 37 that extends in the axial direction and is open to the rear end of the end cap 18 is formed on the inner peripheral surface of the opening 24 in which the female screw 35 is formed. When the pressure in the air chamber 13 exceeds the normal pressure range, the O-ring 28 is separated from the seal seat 29 and the compressed air in the air chamber 13 passes through the exhaust passage 37 formed in the end cap 18. I try to discharge it to the atmosphere. Such an exhaust passage 37 can be easily manufactured by forming a groove shape in advance at the time of molding the material of the end cap 18 by casting, die casting, or the like, and subjecting it to internal thread processing, and manufacturing costs can be reduced. Can be reduced.

  Further, as shown in FIG. 4, an intermediate body 38 that is rotatably held with respect to the plug housing 31 is provided on the rear side of the hollow plug housing 31 attached to the end cap 18. A plug holder 22 for attaching an air plug is rotatably held with respect to the intermediate body 38. The intermediate body 38 is rotatably held by a plug housing 31 on a first axis extending to the rear side of the grip portion 12, and the intermediate body 38 has a second axial direction inclined at a predetermined angle with respect to the axis. The plug holder 22 is rotatably held on the second axis by one end side of the plug holder 22. A nipple portion 40 extending in a direction inclined at a predetermined angle with respect to the second axis is formed on the other end side of the plug holder 22, and a socket attached to the end portion of the air hose on the nipple portion 40. A detachable air plug 41 is attached. Thus, by attaching the plug holder 22 for attaching the air plug 41 attached to and detached from the air hose to the plug housing 31 so as to be rotatable in an inclined axial direction via the intermediate body 38, the direction of the air plug 41 is swung in a free direction. It is possible to improve the workability of the tool used by connecting with the compressed air supply source and the air hose.

  Hereinafter, the operation state of the said Example is demonstrated. As shown in FIG. 8, in the normal state, the end cap 18 to which the filter case 21 and the plug holder 22 are attached is attached to the end of the grip portion 12 of the nailing machine 1, and the end of the air hose is attached to the plug holder 22. An air plug 41 that is detachably attached to a socket part that is attached to the part is attached. The filter case 21 is disposed in the air chamber 13 formed inside the grip portion 12, and compressed air supplied via the air plug 41 passes through the dust-proof filter 26 accommodated in the filter case 21 and passes through the air. It is supplied into the chamber 13. Since foreign matter such as sand and dust adhering to the inside of the air plug 41 is captured by the dust filter 26, it does not enter the air chamber 13 of the nail driver 1.

  The O-ring 28 attached to the filter case 21 and the O-ring 34 attached to the plug housing 31 are fitted with the pressure of compressed air in the normal pressure range for operating the nail driver 1 supplied into the air chamber 13. The filter case 21 acts on the diameter difference portion formed by the inner diameter of the cylindrical portion 33 that presses the filter case 21 backward, but the compressed air in the normal pressure region acts on the diameter difference portion to cause the filter case 21 to move. The spring force is set so that the urging force of the spring 32 that presses the filter case 21 forward is larger than the force that presses the filter case 21 forward. The O-ring 28 attached to the filter case 21 is brought into close contact with the seal seat 29 formed in the inner flange portion 25 of the opening 24 by being pressed forward by the urging force of And it is shut off from the atmosphere of the air chamber 13 is. In this state, the nail driver 1 is driven by the compressed air supplied into the air chamber 13 through the air plug 41, and the nail driving operation is performed.

  When compressed air having a pressure higher than the normal pressure for driving the nailer 1 is supplied into the air chamber 13, the compressed air is attached to the O-ring 28 attached to the filter case 21 and the plug housing 31. The compressed air of high pressure acts on the diameter difference portion formed by the inner peripheral surface of the cylindrical portion 33 with which the O-ring 34 is fitted, and the pressing force pressing the filter case 21 rearward is As shown in FIG. 9, the filter case 21 is moved rearward against the urging force of the spring 32, so that the O-ring 28 attached to the filter case 21 is larger than the urging force of the spring 32. Is separated from the seal seat 29 formed in the inner flange portion 25 of the opening 24, and the atmosphere in the air chamber 13 passes through the exhaust passage 37 formed in the end cap 18. Is connected, the high pressure of the compressed air in the air chamber 13 to lower the pressure in the air chamber 13 is discharged to the atmosphere through the exhaust passage 37 to a predetermined pressure.

  The dustproof filter 26 housed in the filter case 13 is a cylinder whose one end is opened by a generally commercially available filter material such as plastic, metal or ceramic having a fine hole, or a long fiber such as synthetic fiber or wool. The compressed air that has entered the inside of the dust filter 26 from the open end side passes through the dust filter 26 and is supplied into the air chamber 13 through the air supply port 30. At this time, foreign matter such as sand and dust adhering to the air plug 41 or the socket is captured by the dustproof filter 26, and these foreign matter can be prevented from entering the drive unit. These foreign substances accumulate in the dust filter 26 and clog the dust filter. When the dust filter 26 thus clogged is cleaned or replaced, as shown in FIG. By removing the plug housing 31 screwed into the end cap 18 from the end cap 18, the open rear end surface of the filter case 21 can be exposed, so that the dust filter 26 can be easily replaced. The plug housing 31 is formed with a two-sided width 42 for engaging with a tool such as a spanner during screwing operation.

  In the above embodiment, both the filter device and the relief valve mechanism are formed on the end cap 18. However, when the function of the relief valve is not required, the filter case 21 is attached to the end cap 18 as shown in FIG. The O-ring 34 at the front end portion of the plug housing 31 that is disposed at the front end of the formed opening 24 and screwed into the opening 24 from the rear side of the end cap 18 is attached to the filter case 21. While being fitted in the cylindrical part 33, the front end edge of the plug housing 31 is brought into contact with the filter case 21 so that the filter case 21 cannot be moved. In this way, the filter case 21 is fixedly mounted in contact with the plug housing 31 at the front end in the opening 24 of the end cap 18, so that the O-ring mounted on the outer peripheral surface of the filter case 21 is attached. A spring 28 is pressed against the seal seat 29 of the inner flange portion 25 formed at the end of the opening 24 to form a hermetic seal between the air chamber 13 and the atmosphere, and presses and biases the filter case 21 32 becomes unnecessary, and the cost can be reduced.

Longitudinal side of a nailer equipped with the end cap of the present invention Perspective view of the end cap part removed from the nail driver Rear view of the same end cap as in FIG. Sectional drawing in the AA line in FIG. Sectional drawing in the BB line in FIG. End cap perspective view Vertical side view of the same end cap as in FIG. Longitudinal side view of the normal end cap part mounted on a nailing machine Vertical side view of the end cap with the relief valve activated Longitudinal side view of the end cap showing the condition for filter replacement Vertical side view of an end cap according to another embodiment

Explanation of symbols

1 Nailer (Compressed air tool)
DESCRIPTION OF SYMBOLS 12 Grip part 13 Air chamber 18 End cap 21 Filter case 22 Plug holder 25 Inner flange part 26 Dust-proof filter 27 Outer flange part 28 O-ring 29 Seal seat 30 Air supply port 31 Plug housing

Claims (4)

  An air chamber for storing compressed air is formed in the tool, and an end cap is provided that is detachably connected to the other end of the hose, one end of which is connected to a compressed air supply source. In a compressed air tool that is driven by compressed air supplied into the air chamber, a sleeve shape in which the inside and outside of the air chamber are communicated with an end cap attached to the tool so as to shut off the air chamber from the atmosphere. The filter case is formed in a cylindrical shape with one end opened and an air supply port is formed through the inside and outside of the filter case on the other end, and further includes a dustproof filter inside. An O-ring that is arranged in the opening so that the opening is exposed in the air chamber, and the filter case is mounted on the outer peripheral surface of the filter case The hollow plug housing mounted in the opening from the rear side of the end cap so as to form a seal in intimate contact with the seal seat formed at the end of the opening. A featured end cap for compressed air tools.   The end cap is further provided with an exhaust passage for communicating between the air chamber and the atmosphere, and a filter case is slidably disposed in the opening so that the compressed air in the air chamber acts on the filter case. When the compressed air in the normal pressure range for driving the compressed air tool is supplied, the filter case is disposed at the front end position against the pressing force of the compressed air. An urging means for urging the filter case forward is provided, and when compressed air exceeding the normal pressure range is supplied, the filter case is slid by the compressed air pressure to move the O-ring. The compressed air in the air chamber is discharged to the atmosphere via the exhaust passage by separating the seal from the seal seat. End cap of the compressed air tool according to claim 1 that.   An air chamber for storing compressed air is formed in the tool, and an end cap is provided that is detachably connected to the other end of the hose, one end of which is connected to a compressed air supply source. In a compressed air tool that is driven by compressed air supplied into the air chamber, a sleeve shape in which the inside and outside of the air chamber are communicated with an end cap attached to the tool so as to shut off the air chamber from the atmosphere. The filter case is formed in a cylindrical shape with one end opened and an air supply port is formed through the inside and outside of the filter case on the other end, and further includes a dustproof filter inside. The filter case is placed in the opening so that the opening is exposed in the air chamber, and the filter case is brought into close contact with the seal seat formed at the end of the opening. End cap of the compressed air tool, characterized in that mounted by arranged at the end of the rear side of the opening by the hollow plug housing mounted in the opening end cap to form a seal. The end cap is further provided with an exhaust passage for communicating between the air chamber and the atmosphere, and a filter case is slidably disposed in the opening so that the compressed air in the air chamber acts on the filter case. When the compressed air in the normal pressure range for driving the compressed air tool is supplied, the seal between the filter case and the seal seat is released against the pressing force by the compressed air. The compressed air tool end cap according to claim 3, wherein the compressed air in the air chamber is discharged to the atmosphere via the exhaust passage.

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