JP3125823U - Air filler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To temporarily fix an air filler so that it does not come off from the valve fitting even if the air filler is not pressed against the valve fitting during filling of the pressure fitting into the valve fitting. Provided is an air filling device that can be easily fixed to and released from a valve fitting and can simplify the filling operation of pressurized air and improve the efficiency.
A mounting hole 33 of a cap 30 attached to a head portion 20 of an air filling device 10 has an inner diameter larger than an outer diameter of a male screw 42 of a valve fitting 40, and the cap 30 is connected to the valve fitting 40. Is provided with a concave and convex groove such as a female thread 34 that meshes with the male thread 42 of the valve fitting 40, and also has a tapered surface 31 provided at its tip so that its inner diameter gradually increases. The air filler 10 can be temporarily fixed to the valve fitting 40 by simply tilting the female screw 34 of the 30 over the male screw 42 of the valve fitting 40.
[Selection] Figure 2

Description

  The present invention relates to an air filling device, and more specifically, is used to fill an air tube or the like of an automobile tire with pressurized air, and is attached to a tip of a hose or the like connected to a pressure air source to prepare for the air tube or the like. The present invention relates to an air filler used by being connected to a valve fitting.

Conventionally, to fill an air tube of an automobile tire with air, the tip of an air filler provided at the tip of an air hose connected to a compressor or the like is pressed against a thin tubular valve fitting provided on the air tube. Thus, compressed air is fed into the air tube.
In a normal state, the valve fitting is closed by an operating valve mechanism called a valve core or the like so that the internal pressurized air does not escape. Moreover, the operation valve mechanism is also incorporated in the air filler, so that pressure air is not ejected from the air filler in a state where it is not attached to the valve fitting. When the air filling device is pressed against the valve fitting, the operation valve mechanism built in the air filling device and the operation valve mechanism of the valve fitting are operated in contact with each other, and the valve is opened. Pressurized air flows into. After the air tube is filled with pressurized air, a valve cap is attached to the tip of the valve fitting to prevent foreign matter from entering the valve fitting and the valve fitting from being opened accidentally. In order to attach this valve cap, a male screw is cut on the outer periphery of the valve fitting, and a female screw cut on the inner periphery of the valve cap is screwed in.

However, in the conventional air filler as described above, while the pressure air is being fed into the air tube, the air filler must always be pressed against the valve fitting, which is very troublesome. was there.
The air filling device and the valve fitting are designed to open the valve by pressing the working valve mechanism against each other. If the air filling device is not strongly pressed against the valve fitting, the working valve mechanism will be closed. Pressure air does not flow from the air filler to the valve fitting. Further, since high-pressure air passes from the air filler to the valve fitting, a force acts in the direction of separating the air filler and the valve fitting from each other as the pressurized air tries to escape to the outside. Therefore, the force that presses the air filling device against the valve fitting requires a considerably large force.If this pushing loosens, the pressure air leaks from the gap between the air filling device and the valve fitting, and the reaction causes the air filling device to It will come off from the valve fitting. When the air filler is removed from the valve fitting, the reaction of the pressure air ejected from the air filler causes the air filler or the air hose to jump off, resulting in injury to the operator or damage to surrounding objects. There is also sex.

In order to solve the above problems, a method has been proposed in which a clip-like engagement mechanism is provided at the tip of the air filler, and the air filler is fixed to the valve fitting by this engagement mechanism.
However, such a clip-like engagement mechanism hooks and fixes the claw-like engagement piece locally on the outer periphery of the valve fitting, so that the male screw of the valve fitting is crushed and the valve cap cannot be attached. There arises a problem that the metal fitting is locally deformed or damaged. In addition, the claw-like engagement piece is inferior in mechanical strength and durability, so the air filler cannot be fixed to the valve fitting during repeated use, or the engagement mechanism slides during handling. Parts and bearings are often damaged and become unusable. In addition to pressing the tip of the air filling device against the valve fitting, it is necessary to operate a clip or the like provided at the tip of the air filling device. As described above, the air filling device is pushed against the valve fitting. The work is more cumbersome than just the one. In addition, depending on the structure or mounting state of the tire, when the position of the valve fitting provided on the air tube is a place that is difficult for the operator to reach, it is necessary to perform the complicated manual operation as described above. The mechanism cannot be adopted. Specifically, if you want to fill the air tube of the double tire of a truck with air, keep the operator's hand or fingertip up to the position of the valve fitting of the air tube located on the back side of the double tire. It is almost impossible to operate the engagement mechanism by letting it go.

  Therefore, the task of this device is to temporarily fix the air filler so that it does not come off from the valve fitting even if the air filler is not always pressed against the valve fitting during the air filling operation. It is an object of the present invention to provide an air filler that can easily fix and release the air filler from the valve fitting, simplify the filling operation of pressurized air, and improve the efficiency.

  An air filling device according to the present invention that solves the above-described problems is an air that is provided with a base at a tip and is connected to a supplied side valve fitting having a male thread on the outer periphery to supply pressure air to the supplied side. In the filling device, the mounting hole of the cap has an inner diameter larger than the outer diameter of the male screw of the valve fitting, and an uneven groove that meshes with the male screw of the valve fitting when the cap is tilted with respect to the valve fitting. At the same time, the tip is also provided with a tapered surface whose inner diameter gradually increases toward the inlet.

  According to the air filling device according to the present invention, the air filling device can be easily and securely attached to the valve fitting by simply forming a concave and convex groove such as a female screw in the mounting hole formed in the base of the head portion. Can do. That is, according to the present invention, after the fitting hole of the base is fitted over the tip of the valve fitting and fitted straight, the mounting hole, that is, the base and the head part, for example, is tilted 5 ° to 10 ° for an extremely simple operation. Thus, the male screw of the valve fitting and the concave and convex groove of the base are engaged with each other, so that the head portion of the air filler can be fixed to the valve fitting. In addition, since the tip of the mounting hole of the base is provided with a tapered surface, the operation of inserting the valve fitting into the mounting hole can be performed very easily.

As a result, there is no hassle of constantly pressing the air filler against the valve fitting during the air filling operation as in the prior art, and after the air filler is fixed to the valve fitting, the operator is in a state of letting it go. As a result, the labor can be greatly reduced. Further, unlike the conventional clip-like engagement mechanism, it is not necessary for the operator to extend the hand to the tip of the head part to perform engagement and disengagement operations. It is possible to attach and detach the air filler simply by tilting or returning the air filler to the original position, and in this respect as well, the work can be simplified or the labor can be reduced. In addition, unlike the clip-like engagement mechanism, there is no risk of crushing the thread of the valve fitting or deforming the valve fitting, and it will not break down or wear out. It becomes possible to do.

  Furthermore, it is preferable that a groove is formed on the entire periphery along the outer periphery of the joint surface with the packing, and a ring-shaped protrusion is formed on the packing so as to fit the groove. Air leakage prevention effect is improved compared to products.

First, the valve fitting using the air filling device of the present invention has a structure in which a tubular valve fitting main body and a so-called valve core are incorporated in the valve fitting main body, Has a male thread. The structure of the valve fitting, the diameter of the male screw, the pitch, and the like are determined by JIS and other various standards, and the present invention can be directly applied to a normal valve fitting having such a standard size.
The basic structure of the air filler is the same as that of an air filler used for a normal valve fitting. Specifically, a joint part for connecting an air hose connected to a pressure air source such as a compressor, an operation part to be grasped when an operator holds or operates it by hand, a head part to be attached to a valve fitting, and a head part It is attached to the tip of the valve and has a base that directly contacts the valve fitting. If an extension shaft part is interposed between the operation part and the head part, the distance between the operation part and the head part can be set freely, and pressure air filling work is also performed on valve fittings that are difficult to approach. Can be done. In addition, if the configuration angle of the operation part and the head part or the attachment angle of the base is set appropriately, it can also be used for valve fittings where it is difficult to work simply by aligning these parts on a straight line. Can do.

As described above, the head of the air filler has an operating valve that prevents pressure air from leaking when it is not attached to the valve fitting, or activates the valve mechanism of the valve fitting when attached to the valve fitting. A mechanism is built in, and a base fitted into the tip of the valve fitting is provided at the tip of such a working valve mechanism. As the head portion, a portion attached to the valve fitting, that is, a member provided with only one set or a plurality of sets of the operating valve mechanism and the base can be used.
The base has a substantially cylindrical shape or a hollow disk shape. The base may be integrally formed with the head part, but is manufactured separately from the head part and is detachably attached to the head part by means of screwing or engagement. Is preferred for manufacturing and handling. When the base is screwed and fixed to the head portion, if a tool fitting portion that can be rotated with a tool such as a spanner or a wrench is provided on the outer periphery of the base, the work can be easily performed. As a tool fitting portion, a hexagonal nut shape or other polygonal or uneven shapes can be used as in the case of a normal metal fitting. As the tool fitting portion, a groove or unevenness in the diameter direction may be formed on the tip surface of the base.

  The base is attached to the head portion of the air filler via a packing. At this time, as described above, in the present invention, since the base is used in an inclined state with respect to the valve fitting, in order to prevent air leakage at this time, the packing is not only in the inclined state but also in the inclined state. And the valve fitting must be in close contact with each other at least partially over the entire circumference. In this case, a part of the tip of the valve fitting is strongly pressed against the packing to cause twisting, and the outer peripheral portion of the packing is pulled toward the inner peripheral side. Leakage may occur, but in order to prevent this, the following configuration is preferable. That is, a groove is formed on the base along the outer periphery of the joint surface with the packing, and a ring-shaped protrusion is formed on the packing to fit the groove. In this way, even if a force that pulls the outer peripheral portion of the packing toward the inner peripheral side acts, the outer peripheral portion of the packing is fixed and fixed at the same position by the engagement relationship between the groove and the ring-shaped protrusion. Therefore, the generation of a gap can be prevented and air leakage can be prevented.

Here, as the packing, it is preferable to use one having a softer hardness than before. In this way, compared to a hard packing, when the base is tilted with respect to the valve fitting, a sufficient degree of adhesion can be provided and air leakage can be prevented without strongly pressing against the valve fitting. This is because the burden is reduced and the life of the packing is extended.
The base is provided with a mounting hole into which a tubular valve fitting can be inserted. The above-described operating valve mechanism is disposed in the back of the mounting hole. The inner diameter of the mounting hole is set to be larger than the outer diameter of the male thread of the valve fitting, and an uneven groove is formed in the mounting hole. That is, the innermost peripheral diameter of the tip of the convex portion of the concave and convex groove is made larger than the outer diameter of the male screw of the valve fitting. Therefore, when the mounting hole of the base is put on the valve fitting, there is a slight gap between the mounting hole and the male screw outer diameter of the valve fitting. The larger the gap is, the easier it is to mount the cap mounting hole on the valve fitting. Fixing is easily released. Therefore, the amount of the gap is usually 0. It is preferable to set within a range of several mm to several mm.

Since the tip of the mounting hole is provided with a tapered surface and the inner diameter increases toward the inlet, the operation of inserting the valve fitting can be performed more easily.
The structure and arrangement of the concavo-convex groove may be such that when the cap fitting mounting hole is put on the tip of the valve fitting and the cap is inclined with respect to the valve fitting, the concavo-convex groove engages with the male screw of the valve fitting. Normally, the mounting hole of the base and the male screw of the valve fitting are engaged with each other in a certain range at two locations on both ends in the axial direction, so that the concave and convex grooves should be provided at least in the vicinity of the two locations. By forming a spiral or concentric concave / convex groove over the entire length of the insertion hole as the concave / convex groove, it can be surely engaged regardless of the insertion depth and inclination direction of the air filler, that is, the mounting hole to the valve fitting This is preferable. In this case, it is preferable that the groove portions (valley portions) of the concavo-convex grooves are formed at an angle of 60 ° because they can be particularly strongly engaged.

The base can be formed of a material similar to that of a normal metal fitting, such as steel, stainless steel, or brass, but it is preferable to use a hard material such as carbon steel in order to prevent wear and deformation of the uneven grooves described above. .
When fitting the mounting hole of the base provided in the air filler over the valve fitting, since the tip of the mounting hole has a tapered surface, the inlet part of the mounting hole has a particularly large inner diameter, It is very easy to put the inlet portion on the valve fitting. After that, when fitted straight from the center axis direction of the valve fitting, the inner diameter of the mounting hole is larger than the outer diameter of the male thread of the valve fitting, so the fitting hole fits smoothly into the depth of the valve fitting. be able to. Since the operating valve mechanism provided inside the mounting hole and the operating valve mechanism of the valve fitting are pushed together, the pressurized air flows from the air filler to the valve fitting.

  In this state, when the mounting hole of the air filler is tilted with respect to the valve fitting, the concave and convex grooves provided in the mounting hole mesh with the male thread of the valve fitting. When the concave / convex groove is engaged with the male screw, the air filler may be stopped from being pressed against the valve fitting, and the hand may be released from the air filler. This is because the mounting hole cannot move in the axial direction with respect to the valve fitting in a state where the concave and convex groove is engaged with the male screw, and the mounting hole, that is, the air filling device cannot be detached from the valve fitting. The action force to move the mounting hole in the axial direction of the valve fitting works due to the repulsive force accompanying the pushing of the actuating valve mechanism or the action of pressurized air, but these action forces make the concave and convex grooves and the male screw stronger together. Since it acts in the pressing direction, the engagement between the concave and convex grooves and the male screw becomes excessively strong, and the air filler is difficult to come off from the valve fitting.

  Therefore, in this device, after fitting the mounting hole of the air filling device linearly from the central axis direction of the valve fitting, the air filling device is attached to the valve fitting by simply inclining, for example, 5 ° to 10 °. It can be fixed. After a sufficient amount of pressurized air is filled in the air tube to which the valve fitting is attached, the inclination of the air filler, that is, the mounting hole, can be restored and the mounting hole can be positioned concentrically with the male screw of the valve fitting. Since the engagement between the concave and convex grooves of the mounting hole and the male screw of the valve fitting is released, the air filler can be removed from the valve fitting by removing the mounting hole straight in the center direction of the valve fitting in this state. Can be removed.

  Next, embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows the entire structure of the air filling device 10, and a joint portion 16 to which an air hose 50 connected to a compressor or the like is connected is provided at the rear end of a grip-like operation portion 14 made of rubber or the like. Yes. A head portion 20 is provided at the distal end of the operation portion 14 via the extension shaft 12. The pressurized air is supplied from the joint portion 16 through the extension shaft 12 to the head portion 20. The head portion 20 is provided so as to form an angle of 160 ° with the extension shaft 12. At both ends of the head portion 20, a base 30 for mounting on the valve fitting 40 is provided. By mounting the base 30 so as to cover the tubular valve fitting 40, pressurized air is fed into the valve fitting 40. A male screw 42 is cut on the outer periphery of the tip end of the valve fitting 40.

  Of the pair of caps 30 of the head unit 20, when mounting the cap 30 on the distal end side to the valve fitting 40, the operation unit 14 is operated to be pressed. When attaching the base 30 on the rear end side of the head part 20 to the valve fitting 40 (represented by a two-dot chain line), the base 30 is hooked on the valve fitting 40 and the operation unit 14 is pulled back. If such two bases 30 are properly used, the air filler can always be used in an appropriate state depending on the structure of the tire or air tube or the mounting state of the valve fitting 40. In addition, the operation unit 14 is provided with an enlarged portion that prevents slipping at both the front end and the rear end so that the two operations as described above can be easily performed. Work can be performed appropriately and easily.

FIG. 2 shows a detailed structure of the head unit 20 and the valve fitting 40. First, the valve fitting 40 has a tubular shape, a male screw 42 is cut on the outer periphery of the tip, and an inside is provided with a so-called valve core having an actuating pin 44 at the tip. When the operation pin 44 is operated so as to be retracted, the valve is opened so that pressurized air can flow in. Since the operating pin 44 is always urged in a protruding direction by the pressure of a spring or air, pressure air does not leak from the valve fitting 40 unless the operating pin 44 is operated to be forcibly retracted. .
A cavity 22 connected to the air passage 24 is provided in the head portion 20. Similarly, a hollow disk-shaped base 30 is attached to an end of the cavity 22 via a hollow disk-shaped rubber packing 28. In order to prevent air leakage in a state in which the valve fitting 40 is inserted into the base 30 and in a state in which the base 30 is inclined from that state, the rubber packing 28 needs to be in close contact with the valve fitting 40. Therefore, the inner diameter of the rubber packing 28 needs to be set to a size that can ensure such airtightness. At this time, as shown in detail in FIG. 3, a groove 35 is formed in the base 30 along the outer periphery of the joint surface with the rubber packing 28, and the rubber packing 28 fits the groove 35. A ring-shaped protrusion 43 is preferably formed. By adopting such a configuration, as described above, the effect of preventing air leakage is improved. Here, the rubber packing 28 is softer than the conventional one, and the packing life can be extended for the reason described above. The base 30 is made of carbon steel, and the rear end is screwed onto the head 20. As shown in FIG. 1, a hexagonal tool fitting portion 32 is formed on the outer periphery of the base 30, and the base 30 can be attached to and detached from the head portion 20 by turning the tool fitting portion 32 with a spanner or the like. It is like that. A round outer diameter base may be used, but a polygonal shape such as a hexagonal shape or an uneven shape can be securely tightened.

A mounting hole 33 is formed through the inner periphery of the base 30, and a female screw 34 is cut into the mounting hole 33. The inner diameter D ₁ of the mounting hole 33 i.e. the internal thread 34 must be set slightly larger than the outer diameter D ₀ of the external thread 42 of the valve fitting 40 described above. Specifically, since the male screw 42 of the valve fitting 40 is sized according to various standards, for example, the male screw 42 of the valve fitting 40 is formed with an outer diameter of 7.9 mmφ with 5 / 16-32 threads. In this case, the internal diameter of the female screw 34 of the base 30 may be set to 9.0 mmφ with the same pitch and the same number of threads as the male screw 42. In order to facilitate the insertion of the valve fitting 40, a tapered surface 31 is provided at the tip of the mounting hole 33, and the inner diameter increases toward the inlet.

The base 30 used in the present invention is provided with a tapered surface as described above. However, since it is almost the same in appearance as the base used in the conventional normal air filler, it is distinguished from this. For this reason, if the outer surface of the base 30 is given a specific color or given a specific surface treatment, the difference from the conventional product can be clarified or emphasized in terms of sales or distribution management.
An operating valve body 60 is disposed inside the head part 20 and behind the base 30. The actuating valve body 60 includes a disc-shaped valve seat portion 66 and a plate-like push projection 62 that protrudes forward from the valve seat portion 66. The push protrusion 62 has a step slightly on the back side from the tip, has a wide width on the back side, and the step portion is an inclined portion 64. In the present embodiment, the inclined portion 64 is an essential configuration, and pressure air does not flow in without the operating pin 44 if it is below a certain size. A coil spring 26 is mounted behind the valve seat portion 66. The coil springs 26 are attached in a state of being sandwiched between operating valve bodies 60 provided on the front and rear caps 30 of the head portion 20, and the operating valve bodies 60 on both sides protrude toward the distal ends of the respective caps 30. Always energized in the direction to make it.

In the operating valve body 60, the valve seat 66 is strongly pressed against the rubber packing 28 by the repulsive force of the coil spring 26 and the pressure air supplied into the cavity 22. Even at the supply pressure, pressurized air cannot be ejected. Even if the coil spring 26 is not provided, the operating valve body 60 can be elastically urged by the action of pressurized air. However, if the coil spring 26 is attached, the operation of the operating valve body 60 is quicker and more reliable. Can be done. In particular, the use of a coil spring is indispensable if further adhesion to the rubber packing is required.
In order to use the air filling device 10 having the above-described structure, for example, as shown in FIG. 1, the mounting hole 33 formed in the base 30 at the tip of the head portion 20 of the air filling device 10 is used as a valve fitting. It covers the tip of 40 and fits linearly from the central axis direction. As shown in FIG. 4, the tip of the valve fitting 40 is inserted into the mounting hole 33. At this time, since the tip of the mounting hole 33 is provided with a tapered surface, the inner diameter increases toward the inlet. In addition, there is a gap between the female screw 34 of the base 30 and the male screw 42 of the valve fitting 40. When the operating pin 44 of the valve fitting 40 and the tip surface of the push projection 62 at the back of the mounting hole 33 come into contact with each other, it operates to retract in the opposite directions. Further, when the end face of the valve fitting 40 comes into contact with the inclined portion 64 of the pushing projection 62, they are pushed together. As a result, in the head portion 20 of the air filling device 10, there is a gap between the valve seat portion 66 of the operating valve body 60 and the rubber packing 28, so that it passes through this space and further between the push projection 62 and the rubber packing 28. The compressed air is ejected to the tip end side of the base 30 through the passage. As the operating valve body 60 moves, the coil spring 26 is contracted, so that the repulsive force of the coil spring 26 acts strongly on the operating valve body 60. In the valve fitting 40, the valve is opened by retracting the operating pin 44, so that pressure air flows from the base 30 toward the valve fitting 40. In this case, since the valve fitting 40 and the rubber packing 28 are in close contact with each other at least partially over the entire circumference, the compressed air leaks from the gap between the female screw 34 of the base 30 and the male screw 42 of the valve fitting 40. There is no.

However, in this state, a force in the direction of separating the head portion 20 and the valve fitting 40 is applied by the action of the repulsion of the coil spring 26 and the pressure air, so that the head portion 20 is not pressed against the valve fitting 40. The head portion 20 is detached from the valve fitting 40. Therefore, as shown in FIG. 5, the head portion 20 is slightly inclined with respect to the central axis of the valve fitting 40. The direction of tilting may be any direction. As a result, the mounting hole 33 and the female screw 34 of the base 30 are also inclined with respect to the male screw 42 of the valve fitting 40, and the female screw 34 of the base 30 contacts the male screw 42 of the valve fitting 40 and meshes with each other. As shown, the internal thread 34 and external thread 42 engages has an inlet in the peripheral portion close to X ₁ of the mounting hole 33, becomes the X ₁ moiety and symmetrical position of the valve fitting 40 at the back of the mounting hole 33 tip edge is a close part _{X 2.} In each of the meshing portions X ₁ and X _2, so that one minute or several minutes of the threads are engaged with each other at a certain angle range.

Even in this state, as described above, the force is applied in the direction of separating the base 30 from the valve fitting 40 by the restoring force and the action of the pressurized air that the operating pin 44 and the operating valve body 60 try to return to the original state. This force strongly presses the female screw 34 and the male screw 42 at the meshing portions X ₁ and X ₂ , and as long as the female screw 34 and the male screw 42 are meshed with each other, no further movement is possible. The metal fitting 40 and the base 30, that is, the head portion 20 are temporarily fixed.
As can be seen from the above operation, the female screw 34 of the base 30 and the male screw 42 of the valve fitting 40 can be reliably engaged with each other in any direction on the circumference and in any axial direction. It is not necessary to set the tilt direction and tilt angle accurately, and it can be operated very easily. After that, even if the head portion 20 is not pressed against the valve fitting 40, it is temporarily fixed by the engagement of the female screw 34 and the male screw 42, and the pressure air is supplied from the head portion 20 of the air filler to the valve. It is reliably supplied to the metal fitting 40. Even if the operation part 14 of the air filler 10 is released, if the meshing is sufficient, the air filler 10 may be detached from the valve fitting 40 unless a force that changes the tilt of the head part 20 is applied. Absent.

  Since the valve fitting 40 and the rubber packing 28 are in close contact with each other as described above, even when the cap 30 is inclined, the pressure air remains between the female screw 34 of the cap 30 and the male screw 42 of the valve fitting 40. There is no leakage. At this time, a portion in which the valve fitting 40 is strongly pressed into the rubber packing 28 is generated. As described above, the groove 30 is formed in the base 30 along the outer periphery of the joint surface with the rubber packing 28. Further, since the rubber packing 28 is formed with a ring-shaped protrusion 43 so as to be fitted to the groove 35, the rubber packing 28 stays in the same position even when the rubber packing 28 is pulled to the inner peripheral side, and the base 30 and the rubber packing 28. There is no gap between the joint surface and air leakage.

In a preferred embodiment, the rubber packing 28 is made of a soft material, and sufficient adhesion can be ensured without pressing strongly, so that a long packing life can be obtained.
At this time, if the moment due to the weight of the air filler 10 is applied in a direction in which the head portion 20 is further inclined with respect to the valve fitting 40, the air filler 10 is unlikely to come off the valve fitting 40. Specifically, in FIG. 1, assuming that gravity is applied downward, it is better to tilt the air filler 10 downward and fix it to the valve fitting 40 (in the direction opposite to the white arrow in the figure). . If a weight made of an appropriate tool or the like is placed on the air filler 10 or if the end of the air filler 10 or the air hose 50 is temporarily fixed by an appropriate means, the inclination of the air filler 10 may be mistaken. It is possible to reliably prevent the valve fitting 40 from being detached.

  When the target air tube is filled with the pressure air from the valve fitting 40, the air filler 10 is removed from the valve fitting 40. Specifically, the inclination of the head portion 20 of the air filler 10 is returned to the original so as to coincide with the central axis direction of the valve fitting 40. Then, the engagement between the female screw 34 and the male screw 42 is released, and the state shown in FIG. 4 is obtained. In this state, since the force acts in the direction of separating the head portion 20 from the valve fitting 40 due to the repulsive force of the coil spring 26 and the action of pressurized air, the air filler 10 can be naturally operated without performing any special operation. Therefore, it will come off from the valve fitting 40. When the air filler 10 is detached from the valve fitting 40, the operating pin 44 of the valve fitting 40 returns to its original state and the valve is closed, so that pressurized air does not leak from the valve fitting 40. In the air filler 10, the operating valve body 60 is returned to the original state and the valve is closed, so that there is no concern that the pressurized air is ejected wastefully.

  The air filling device according to the present invention is suitably used, for example, for filling pressurized air into an air tube of an automobile tire.

Overall structure diagram of an air filling device showing an embodiment of the present invention Expanded sectional view of the head Enlarged sectional view showing the relationship between the base and packing Enlarged sectional view of the mounting hole covered with the valve fitting Enlarged sectional view with the mounting hole tilted

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Air filler 20 Head part 30 Base 33 Mounting hole 34 Female screw (uneven groove)
40 Valve fitting 42 Male thread D ₀ Male thread outer diameter D ₁ Female thread inner diameter

Claims (2)

  In an air filling device that is provided with a base at the tip and is connected to a supplied side valve fitting that has a male thread on the outer periphery to supply pressurized air to the supplied side, the mounting hole of the base has a valve fitting The groove has an inner diameter larger than the outer diameter of the male screw and is engaged with the male screw of the valve fitting when the base is tilted with respect to the valve fitting, and the inner diameter gradually increases toward the inlet at the tip. An air filler characterized by comprising a taper surface that expands.   The base is attached to the tip of the head portion of the air filler via a packing, and the base has a groove formed along the outer periphery of the joint surface with the packing. The air filler according to claim 1, wherein a ring-shaped protrusion is formed to fit the groove.

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