JP2007050498A - Air feeding method for air tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce and suppress reduction of pressure of air to be supplied to an air tool below a prescribed operation pressure. <P>SOLUTION: When supplying air to the air tool 10 using air having a pressure within a prescribed scope, air is compressed and is stored in air tanks 11A, 12A, air is supplied to the air tool from the air tank of a main compressor by an air feeding hose 13 by using the main compressor 11 and a subcompressor 12 for feeding air from the air tanks, and air is supplied to the air tank of the main compressor from the air tank of the subcompressor by an air feeding hose 14 to reduce and suppress reduction of pressure of air to be supplied to the air tool. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air supply method for an air tool, for example, a method that can reduce and suppress a decrease in air pressure for operating a nailing machine to a pressure below a specified range.

  For example, when driving a nail, the nail head was hit with a hammer, but a nailing machine that hits the nail using air is often used to reduce the burden on the operator. Yes. In such a nailing machine, a method of generating air with an air compressor and supplying it to the nailing machine is common because it is used in field work such as new construction or expansion of a house.

  Recent construction methods, such as the 2 × 4 method, have a shorter construction period than conventional methods, and are characterized by the use of a very large number of nails. It is required to install.

  However, if air with a pressure within the specified range is repeatedly used within a short time, the air pressure will drop, and the nail cannot be driven reliably, and the nail head may protrude. there were. As a result, it was necessary to wait for several minutes until the pressure in the air tank of the air compressor rose within the specified range and returned, and the work was frequently interrupted.

  On the other hand, an air supply method has been proposed in which air from a plurality of air pumps or air compressors is merged by a mixer to generate and supply high-pressure air (Patent Document 1).

Japanese Utility Model Publication No. 60-80127

  However, the nailing machine does not require air at a pressure higher than the specified operating pressure, but the problem is that the air pressure is lower than the specified operating pressure. I ca n’t.

  This invention makes it a subject to provide the air supply method of the air tool which made it possible to reduce and suppress that the air pressure supplied to a nail driver falls to the pressure below a regulation range in view of this problem.

  Therefore, in the air supply method of the air tool according to the present invention, when supplying air to the air tool that uses air having a pressure within a specified range, the air is compressed and stored in the air tank, and the air is supplied from the air tank. Air is supplied from the air tank of the main compressor to the air tool by the air supply hose, while the air tank of the main compressor is supplied with air from the air tank of the sub compressor by the air supply hose. It is characterized by reducing and suppressing a decrease in air pressure supplied to the air tool.

  One of the features of the present invention is that air is supplied from the air tank of the sub compressor to the air tank of the main compressor. As a result, when the air tool is frequently used in a short time and the air pressure in the air tank of the main compressor starts to drop, air is supplied from the sub compressor to the air tank of the main compressor, and the air of the main compressor is The air pressure in the tank immediately rises and returns to the specified pressure range.

  As a result, almost no waiting time is required until the compressor pressure increases, and the working efficiency can be greatly increased.

  By the way, it is conceivable to use a large-capacity tank compressor as the main compressor instead of using a sub-compressor. However, the compressor of the large capacity tank is not only expensive, but also heavy and bulky, so it is inconvenient to carry on the work site.

  On the other hand, using multiple small-capacity tank compressors to reduce and suppress the decrease in air pressure, the small-capacity tank compressor is lighter and smaller than the large-capacity tank compressor. It is easy to carry on site, and in the case of work that does not frequently use air in a short period of time, it is only necessary to use one small capacity tank compressor, and workability can be improved.

  The air tool to which the method of the present invention is applied is not limited as long as it operates using air having a pressure within a specified range, and examples thereof include a nailing machine, an air duster, an impact wrench, and a spray gun for painting.

  The main compressor and the sub-compressor should be of the same level, but it is also possible to use a compressor with a performance difference. However, when the performance of the main compressor, for example, the air pressure is higher than that of the sub compressor, air flows back from the air tank of the main compressor to the air tank of the sub compressor, and air is supplied to the pressure in the air tank of the main compressor. It may not be possible.

  Therefore, it is preferable that air is supplied from the air tank of the sub compressor to the air tank of the main compressor via a backflow prevention valve. The structure of the backflow prevention valve is not particularly limited.

  In the above, air is supplied from the sub compressor to the air tank of the main compressor, but when the air pressure from the main compressor drops, it is supplied from the sub compressor to the air tool, and if necessary, it is supplied to the air tank of the main compressor. Air may be supplied.

  That is, the air supply method of the air tool according to the present invention compresses air, stores it in the air tank, and supplies air from the air tank when supplying air to the air tool that uses air within the specified range. The main compressor and the sub compressor are used, and air is supplied from the air tank of the main compressor to the air tool by the air supply hose, while the air supply hose between the air tank of the main compressor and the air tool is supplied to the sub compressor. An air supply hose extending from the air tank is connected to reduce and suppress a decrease in air pressure supplied to the air tool.

  One of the features of the present invention is that air is supplied from the sub compressor to the air tool when the air pressure from the main compressor is lowered, and further to the tank of the main compressor as necessary.

  As a result, when the air tool is frequently used in a short time and the air pressure in the main compressor tank begins to drop, air is supplied to the air tool from the sub compressor, and during that time, the air in the main compressor tank Since the air pressure rises and returns to the specified pressure range, air can be supplied from the main compressor to the air tool thereafter.

  In this case as well, it is preferable to use the main compressor and the sub-compressor having the same performance, but it is also possible to use a compressor having a performance difference. However, if the performance of the main compressor, for example, the air pressure is higher than that of the sub-compressor, the air from the main compressor may flow back into the air tank of the sub-compressor, and there is a risk that sufficient air pressure cannot be supplied to the air tool. is there.

  Therefore, it is preferable that air is supplied from the air tank of the sub-compressor to the air supply hose between the air tank of the main compressor and the air tool via a backflow prevention valve. Also in this case, the structure of the check valve is not particularly limited.

  In addition, a hose extending from the air tank of the main compressor and the air tank of the sub-compressor is provided with a backflow prevention valve so that the air tool can be alternately used from the high pressure tank side of the air tank of the main compressor and the air tank of the sub-compressor. It can also be configured to supply air.

  The air supply hose set according to the present invention is an air supply hose set used for supplying air to an air tool that uses pressurized air within a specified range, and is connected to the plug of the air tool at the tip. A first air supply hose provided with a socket, and a plug connected to the socket of the air tank in the main compressor and sub compressor for compressing and storing the air in the air tank and supplying air from the air tank are at the tip. A plurality of second air supply hoses provided; and an air supply coupler to which a rear end of the first air supply hose and a rear end of the second air supply hose are connected. Features.

  A backflow prevention valve may be provided in the air supply coupler on the main and sub compressors, preferably on the sub compressor side. The air supply coupler or the air supply hose in the vicinity thereof may be provided with a regulator for controlling the air pressure at a constant level.

  The rear ends of the first and second air supply hoses may be fixedly connected to a connection port provided in the air supply coupler, but a plug is provided at the rear end of the first air supply hose. A socket is provided at the rear end of the second air supply hose, and a socket to which a plug of the first air supply hose is connected and a socket at the rear end of the second air supply hose are connected to the air supply coupler. It is preferable to provide a plurality of plugs and connect the plug at the rear end of the first air supply hose and the socket at the rear end of the second air supply hose.

  Further, the air supply hose may be wound around a reel and appropriately pulled out. That is, the first air supply hose is wound around a reel, the reel is rotatably supported on the frame, an air supply coupler is fixed at the center of rotation of the frame, and the rear end of the first air supply hose of the air supply coupler The part to which is connected can be configured to be rotatable.

  The air supply plug according to the present invention is an air supply plug used to connect air supply hoses, air supply couplers or air tank sockets to supply air, and can be connected to sockets at both ends. A plug-shaped part is formed, and a backflow prevention valve that closes the air passage of one plug-shaped part is urged in the closing direction by a spring member, and the relief flow valve gradually releases air in the backflow prevention valve Is formed.

  The air supply hose according to the present invention is an air supply hose used for connecting air supply plugs, air supply couplers or air tank sockets to supply air, and connected to sockets at both ends of the hose. A plug that can be connected is connected, a backflow prevention valve that closes the air passage is energized in the closing direction by a spring member in one plug, and a relief passage that gradually releases air is formed in the backflow prevention valve. It is characterized by being.

  Furthermore, the air supply plug according to the present invention is an air supply plug used for supplying air to the air tank from the outside, wherein the front portion is formed with a plug-shaped portion connectable to the socket, and the rear portion is a compressor tank. The backflow prevention valve that closes the air passage is urged in the closing direction by a spring member inside, and the backflow prevention valve has a relief passage that gradually releases air. Features.

  The air supply coupler according to the present invention is an air supply coupler used for connecting an air supply hose, wherein a socket to which a plug of a first air supply hose is connected and a socket of a second air supply hose are connected. A plurality of plugs are provided.

  In this case, it is preferable that a backflow prevention valve for closing at least one of the two air passages on the plug side is urged in the closing direction by a spring member inside the air supply coupler.

  Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings. 1 to 6 show a preferred embodiment of an air supply method for an air tool according to the present invention. In the figure, the nailing machine 10 is provided with a grip 10C on the main body 10D, and a nail supply part 10A is attached between the tip of the main body 10D and the lower end of the grip 10C. When actuated by air at a pressure within the range P, the nail of the nail supply unit 10A can be reliably driven one by one.

  An air supply plug 10B is attached to the lower end of the grip 10C of the nailing machine 10, and a socket 13B attached to the tip of the air supply hose 13 is externally fitted to the plug 10B of the nailing machine 10 to supply air. A plug 13A is attached to the rear end of the hose 13, and the plug 13A of the air supply hose 13 is fitted into the socket 11B of the main compressor 11.

  The main compressor 11 is equipped with an air tank 11A for storing air and a pump (not shown) for compressing and supplying air to the air tank 11A, and for example, two sockets 11B are attached to the air tank 11A. Yes.

  A plug 14B is inserted into the remaining socket 11B of the main compressor 11, and this plug 14B is attached to the tip of the air supply hose 14, and a plug 14A is attached to the rear end of the air supply hose 14. The plug 14A on the rear end side is fitted into the socket 12B of the sub compressor 12, and a compressor having the same performance as the main compressor 11 is used for the sub compressor 12.

  For example, a plug 21 having a structure as shown in FIG. 4 is adopted for the plug 10B of the nailing machine 10, the plug 13A of the air supply hose 13, and the plug 14A of the air supply hose 14 on the sub compressor 12 side. A screw part 21B for hose attachment is formed in the part, and a cylindrical part 21C to be inserted into the socket 22 is formed in the front half part.

  Further, for example, a plug 20 having a structure shown in FIG. 3 is adopted as the plug 14B on the main compressor 11 side of the air supply hose 14, and the plug 20 is formed with a screw portion 20B for hose attachment in the latter half portion and in the front half portion. A cylindrical portion 20 </ b> C to be inserted into the socket 22 is formed, and a check valve 20 </ b> A is built inside and biased in the closing direction by a spring member.

  For example, a socket 22 having a structure as shown in FIG. 5 is adopted as the socket 11B of the main compressor 11, the socket 12B of the sub-compressor 12, and the socket 13B of the air supply hose 13. In the socket 22, the plugs 20 and 21 are arranged in the front half. A cylindrical portion 22C into which the cylindrical portions 20C and 21C are inserted is formed, a check valve 22A is provided in the cylindrical portion 22C, and a hose is attached to the rear half portion or for attaching to the tanks 11A and 12A of the compressors 11 and 12 The screw portion 22B is formed.

  Although the plugs 20, 21 and the socket 22 are provided with a locking mechanism for maintaining the mutual engagement state, they are not directly related to the present invention, and a known structure such as a C-shaped ring is fitted. Therefore, the illustration and description thereof are omitted.

  When the nailing machine 10 is used with one air compressor, when the air compressor is operated, the air pressure in the air tank gradually increases as shown by the characteristic a in FIG. When the tank internal pressure exceeds the maximum pressure P1 in the specified pressure range P, the nail driver 10 can be used.

  Therefore, when a large number of nails are driven using the nail driver 10, the air pressure in the air tank drops. When the nail driver 10 falls below the minimum pressure P2 in the specified pressure range P, the nail driver 10 However, since the nail head remains in the protruding state, it is necessary to stop the nail driving operation and wait until the air pressure in the air tank of the air compressor exceeds the maximum pressure P1 in the specified pressure range P. The waiting time at this time is T0.

  In the present air supply method, the main compressor 11 and the sub compressor 12 are operated, and air is stored in the air tanks 11A and 12A. When the air pressure in the air tank 11A of the main compressor 11 rises and exceeds the maximum pressure P1 in the specified pressure range P, the nailing machine 10 can be used.

  Therefore, when a large number of nails are driven using the nail driver 10, when the air pressure in the air tank 11A drops and becomes less than the minimum pressure P2 in the specified pressure range P, the nail driving operation is interrupted and the standby is performed. There is a need to.

  At this time, when the sub-compressor 12 is operated and the air pressure in the air tank 12A also exceeds the maximum pressure P1 in the specified pressure range P, the air from the pump of the main compressor 11 is supplied to the air tank 11A of the main compressor 11. In addition, since the air from the air tank 12A of the sub-compressor 12 is also supplied by the second air supply hose 14, the air pressure in the air tank 11A of the main compressor 11 is abrupt as shown by the characteristic b in FIG. The maximum pressure P1 in the specified pressure range P is exceeded in a short waiting time T1 (<waiting time T0), and the nail driving operation can be resumed.

  Further, the plug 14B on the main compressor 11 side of the air supply hose 14 employs a plug 20 incorporating a check valve (backflow prevention valve) 20A shown in FIG. 3, so that the air tank 11A of the main compressor 11 The air does not flow back to the air tank 12A of the sub compressor 12 and the air of the main compressor 11 is not wasted.

  The air supply hose 14 provided with the plugs 14A and 14B at both ends can reduce and suppress the pressure drop of the air supplied to the nailing machine 10 by connecting the existing compressors 11 and 12 as described above. The effect is great.

  When a regulator is built in the socket 11B of the air tank 11A of the main compressor 11, if the air is supplied from the sub-compressor 12, that is, if air in the direction of flowing back the regulator is supplied to the socket 11B, the regulator may break down. There is.

  In such a case, it is preferable that a socket not incorporating a regulator is attached to the air tank 11A of the main compressor 11 and air is supplied from the sub compressor 12 using this socket.

  FIG. 7 shows a second embodiment, in which the same reference numerals as those in FIGS. 1 to 5 denote the same or corresponding parts. In this example, a socket 13A of an air supply hose (first air supply hose) 13 is externally fitted to the plug 10B of the nailing machine 10, and a plug 13B is attached to the other end of the air supply hose 13, and the plug 13B. Is inserted into the socket 30B of the air supply coupler 30.

  The air supply coupler 30 is provided with one socket 30B and two plugs 30A, and a regulator 30C is provided to adjust the pressure of the air supplied from the two plugs 30A and send it out from the socket 30B. Yes.

  A socket 13B of an air supply hose (second air supply hose) 13 is externally fitted to the two sockets 30A of the air supply coupler 30, and a plug 13B is attached to the other end of the air supply hose 13. 13B is inserted into sockets 11B and 12B of the main compressor 11 and the sub compressor 12.

  When supplying air to the nailing machine 10, the main compressor 11 and the sub compressor 12 are operated, and air is stored in the air tanks 11A and 12A. When the air pressure in the air tanks 11A and 12A of both compressors 11 and 12 rises and the air pressure in one of the air tanks 11A and 12A exceeds the maximum pressure P1 in the specified pressure range P, the nailing machine 10 You can start using it.

  Therefore, when a large number of nails are driven using the nail driver 10, the air pressure in the air tanks 11A and 12A of the main compressor 11 and the sub compressor 12 and thus the pressure of the air supplied to the nail driver 10 decreases. However, when the pressure is less than the minimum pressure P2 in the specified pressure range P, it is necessary to interrupt the nail driving operation and wait.

  At this time, since both the main and sub compressors 11 and 12 are operating, the air pressure in the air tanks 11A and 12A rapidly increases and exceeds the maximum pressure P1 in the specified pressure range P in a short standby time. The nailing operation can be resumed.

  A plug 20 having a structure in which a check valve (backflow prevention valve) 20A as shown in FIG. 3 is incorporated in two plugs 30A connected to both the main and sub compressors 11 and 12 of the air supply coupler 30 is used. And, when only the air pressure in the air tank 11A, 12A of either the main compressor 11 or the sub compressor 12 becomes less than the minimum pressure P2 of the specified pressure range P for some reason, this is also the specified pressure range P. Until the maximum pressure P1 is exceeded, the air from the other compressor 12, 11 does not flow into the air tanks 11A, 12A of the one compressor 11, 12, and the air is not wasted.

  If the plug 20 having the check valve 20A is used only in the plug 30A on the sub-compressor 12 side of the air supply coupler 30 to prevent the backflow of air in the air supply coupler 30, the air pressure from the main compressor 11 is reduced. It can also be configured to compensate for the decrease in the air by the air of the sub compressor 12.

  Further, when the plug 20 having the check valve 20A is used for both plugs 30A of the air supply coupler 30 to prevent the backflow of air in the air supply coupler 30, either the main compressor 11 or the sub compressor 12 is used. On the other hand, air can be supplied from the air tanks 11A, 12A having higher air pressure to the nailing machine 10, and the nailing operation can be continuously performed without waiting for the air pressure to return. The check valve may be provided not in the air supply coupler 30 but in the sockets 11B and 12B of both the main and sub compressors 11 and 12.

  Further, an auxiliary tank is provided between the air supply coupler 30 and the nail driving machine 10, air from the main compressor 11 and the sub compressor 12 is supplied to the auxiliary tank, and the air pressure is controlled in the auxiliary tank to control the nail driving machine 10. You may make it supply to.

  FIG. 8 shows a third embodiment, in which the same reference numerals as those in FIGS. 1 to 7 denote the same or corresponding parts. In this example, the air supply coupler 30 in the second embodiment is rotatably attached to the rotation center of the side surface of the frame 40B of the hose reel 40, and the air supply hose 13 is wound around the reel 40A of the hose reel 40. .

  A reel 40A is rotatably supported on the frame 40B of the hose reel 40, and a rotating portion is interposed in the socket of the air supply coupler 30, and the socket is configured to rotate with the rotation of the reel 40A. A plug (not shown) at one end of the air supply hose 13 is fitted into the socket 30, and a socket 13 </ b> B is attached to the tip of the air supply hose 13.

  The sockets 13B of the two air supply hoses (second air supply hoses) 13 in the second embodiment are connected to the two plugs 30A of the coupler 30 of the hose reel 40 of this example, and the two air supply hoses are connected. When the 13 plugs 13A are connected to the sockets 11B and 12B of the main and sub compressors 11 and 12, the air supply method according to the present invention can be realized.

  9 and 10 show a fourth embodiment, in which the same reference numerals as those in FIGS. 1 to 7 denote the same or corresponding parts. In this example, the rotating shaft of the hose reel 40 is provided with a rotating part, the tip of the air supply hose 15 is connected to the rotating part, and the base of the air supply hose 13 wound around the reel 40A is connected to the rotating part. It is connected.

  A plug 15A is connected to the rear end of the air supply hose 15, and the plug 15A is connected to the socket 30B of the air supply coupler 30. As shown in FIG. 10, the air supply coupler 30 is provided with a check valve (counterflow prevention valve) 30C for closing the air passage in the plug 30A so as to be urged in the closing direction by a spring member 30D. A relief passage for gradually releasing air is formed at the center.

  As described above, the air supply coupler 30 may be attached via the air supply hose 15 instead of being directly attached to the hose reel 40.

  FIG. 11 shows a fifth embodiment. In this example, plug-shaped portions 50A and 50B are formed at both ends of the air supply plug 50 so that they can be connected to a socket (not shown). A check valve (backflow prevention valve) 50C is provided in the air supply plug 50 by a spring member 50D so as to be urged in the closing direction, and a relief passage 50E that gradually discharges air in the center of the check valve 50C. Is formed.

  As shown in FIG. 12, the air supply plug 50 of this example has the same function as the air supply hose 14 shown in FIG. 2 when the plug-shaped portion 50B is connected to the socket 13B of the normal air supply hose 13. An air supply hose can be configured.

  Further, as shown in FIG. 13, the plug-shaped portion 50B of the air supply plug 50 of this example is connected to the socket 60A of the auxiliary tank 60, and the socket 13B of the air supply hose 13 is connected to the plug-shaped portion 50A. When the plug-shaped portion 50A of the air supply plug 50 of this example is fixed to the auxiliary tank 60, the plug-shaped portion 50B is projected, and the socket 13B of the air supply hose 13 is connected thereto, the main compressor and sub Air from the compressor can be supplied to the auxiliary tank 60, and the air pressure can be controlled in the auxiliary tank 50 to be supplied to an air tool such as a nail driver.

It is a figure which shows typically preferable embodiment of the air supply method of the air tool which concerns on this invention. It is a figure which shows the 2nd hose used in the said embodiment. It is a figure which shows the structure of the plug with a check piece used in the said embodiment. It is a figure which shows the structure of the plug without a check piece used in the said embodiment. It is a figure which shows the structure of the socket used in the said embodiment. It is a figure for demonstrating the effect | action of the said embodiment. It is a figure which shows 2nd Embodiment. It is a figure which shows 3rd Embodiment. It is a figure which shows 4th Embodiment. It is a partial cross section figure which shows the structural example of the air supply coupler 30 in the said embodiment. It is a figure which shows the air supply coupler by 5th Embodiment. It is a figure which shows the usage example of the said air supply coupler. It is a figure which shows the other usage example of the said air supply coupler.

Explanation of symbols

10 Nailing machine (air tool)
10B plug 11 main compressor 11A air tank 11B socket 12 sub compressor 12A air tank 12B socket 13 air supply hose (first and second air supply hose)
13A plug 13B socket 14 air supply hose 14A, 14B plug 30 air supply coupler 30A plug 30B socket 30C check valve (backflow prevention valve)
30D Spring member 40 Hose reel 40A Reel 40B Frame 50 Air supply plug 50A, 50B Plug-shaped part 50C Check valve (backflow prevention valve)
50D Spring member 50E Relief passage

Claims (15)

When supplying air to air tools that use air with a pressure within the specified range,
Using a main compressor and sub compressor that compress air and store it in an air tank and supply air from the air tank,
Air is supplied from the air tank of the main compressor to the air tool by the air supply hose, while air is supplied from the air tank of the sub compressor by the air supply hose to the air tank of the main compressor and is supplied to the air tool. An air supply method for an air tool, characterized in that a decrease in air pressure is reduced and suppressed.   The air supply method for an air tool according to claim 1, wherein air is supplied to the air tank of the main compressor from the air tank of the sub compressor via a backflow prevention valve. When supplying air to air tools that use air with a pressure within the specified range,
Using a main compressor and sub compressor that compress air and store it in an air tank and supply air from the air tank,
Air is supplied from the air tank of the main compressor to the air tool by the air supply hose, and an air supply hose extending from the air tank of the sub compressor is connected to the air supply hose between the air tank of the main compressor and the air tool. An air supply method for an air tool, characterized in that a decrease in air pressure supplied to the air tool is reduced and suppressed.   The air supply method of the air tool of Claim 3 which supplied air from the air tank of the said sub compressor through the backflow prevention valve to the air supply hose between the air tank of the said main compressor, and an air tool.   An air supply hose extending from the air tank of the main compressor and the air tank of the sub compressor is provided with a backflow prevention valve, and the air is supplied from the high pressure air tank side of the air tank of the main compressor and the air tank of the sub compressor. The air supply method for an air tool according to claim 3, wherein air is supplied to the tool. An air supply hose set used for supplying air to an air tool that uses pressure air within a specified range,
A first air supply hose provided at the tip with a socket connected to the plug of the air tool;
A plurality of second air supply hoses each having a plug connected to the socket of the air tank in the main compressor and the sub compressor for compressing and storing the air in the air tank and supplying the air from the air tank; ,
An air supply coupler to which a rear end of the first air supply hose and a rear end of the second air supply hose are connected;
An air supply hose set characterized by comprising:   A plug is provided at the rear end of the first air supply hose, a socket is provided at the rear end of the second air supply hose, and a rear end of the first air supply hose is provided at the air supply coupler. The air supply hose set according to claim 6, wherein a plurality of plugs to which a socket to which the plug is connected and a rear end socket of the second air supply hose are connected are provided.   The air supply hose set according to claim 6 or 7, wherein a backflow prevention valve is provided on the compressor side in the air supply coupler.   The air supply hose set according to any one of claims 6 to 8, wherein a regulator for controlling air pressure to be constant is provided on the air supply coupler or an air supply hose in the vicinity thereof.   The first air supply hose is wound around a reel, the reel is rotatably supported by a frame, and the rear end of the first air supply hose of the air supply coupler is connected to the rotation center of the frame. The air supply hose set according to any one of claims 6 to 9, wherein a portion to be or a front end portion of an air supply hose extending from the portion is rotatably attached. An air supply plug for connecting air supply hoses, air supply couplers or air tank sockets to supply air,
Plug-shaped parts that can be connected to sockets are formed at both ends, and a backflow prevention valve that closes the air passage of the one plug-shaped part is urged in the closing direction by a spring member, and the backflow prevention An air supply plug characterized in that a relief passage for gradually releasing air is formed in the valve. An air supply hose used to connect air supply plugs, air supply couplers or air tank sockets to supply air,
Plugs that can be connected to sockets are connected to both ends of the hose, and a backflow prevention valve that closes the air passage is urged in a closing direction by a spring member in one of the plugs, and air is supplied to the backflow prevention valve. An air supply hose characterized by a relief passage that gradually escapes. An air supply plug used to supply air from outside to the air tank,
The front part is formed with a plug-shaped part that can be connected to the socket, the rear part is provided so as to be fixed to the compressor tank, and a backflow prevention valve for closing the air passage is urged in the closing direction by a spring member inside The air supply plug is characterized in that a relief passage for gradually releasing air is formed in the backflow prevention valve. In the air supply coupler used to connect the air supply hose,
An air supply coupler comprising: a socket to which a plug of a first air supply hose is connected; and a plurality of plugs to which a socket of a second air supply hose is connected. The air supply coupler according to claim 14, wherein a backflow prevention valve for closing at least one of the air passages on the two plug sides is provided in the inside by being biased in a closing direction by a spring member.

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