JP3509378B2 - Hose fitting and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting for connecting hoses such as fire hoses to each other, or for connecting a hose to a pump or other equipment, and a method for manufacturing the fitting. More specifically, the present invention is a hose coupling fitting composed of a pair of male and female coupling fitting main bodies having the same structure, which can be fitted smoothly and has high reliability. The present invention relates to a method of manufacturing the fitting.

[0002]

2. Description of the Related Art Generally, there is a plug type fitting for a hose, for example, a fire hose. In such a fitting type fitting, a pair of fitting main bodies are axially fitted to each other and engaged and locked. Structure. Such a plug-in type fitting is, for example, Japanese Industrial Standard JI.
S B 9911, and such a fitting is called "Machino style fitting" and is widely used.

Such a plug-in type connecting metal fitting can be connected and disconnected by a simple device, and has preferable characteristics as a connecting metal fitting for a fire hose which requires quick and reliable operation.

However, the conventional plug-in type fittings are
There is a distinction between male and female in the pair of connecting metal fittings to be joined, one is configured as a male fitting and the other is configured as a female fitting, and male fittings and female fittings cannot be joined. For this reason, for example, when extending and connecting multiple fire hoses during fire extinguishing work, there is a possibility that the fire hose may be extended so that the male fittings or the female fittings may respond to each other by mistake. It is preferable to eliminate such a possibility from the viewpoint of work speed and certainty. Further, in the conventional coupling metal fitting, two kinds of metal fittings having a different structure, that is, a male fitting and a female fitting, have to be manufactured, which causes a problem that the manufacturing cost becomes high.

In order to solve such a problem, a hose connecting fitting has been developed which is composed of a pair of connecting fitting main bodies having the same shape without distinction between male and female. This one is provided with a plurality of fitting projections arranged in the circumferential direction and projecting in the axial direction at the tips of a pair of cylindrical coupling fitting bodies, and a fitting recess formed between them. The mating protrusions and the mating recesses of the pair of fitting metal fittings are axially fitted to the mating recesses and mating projections of the mating fitting metal fitting bodies on the other side. Locking hooks are formed on the fitting protrusions of the coupling fitting body in the circumferential direction so as to restrict the movement in the axial direction and to lock the pair of coupling fitting bodies in the axial direction. Then, by fitting these fitting protrusions into the fitting recesses, the locking hooks are engaged with each other and the pair of coupling metal fitting bodies are coupled. This product has features such as no distinction between male and female, simple structure, and easy attachment / detachment.

By the way, in such a coupling fitting, the fitting projection, the fitting projection, and the locking hook are fitted to each other, so that the fitting and removal are smooth and the fitting reliability is high. , Strength, etc. are greatly affected by the accuracy of the fitting projection, fitting projection, and locking hook, so that they are accurately machined by cutting. That is, first, a cylindrical work for forming the main body of the fitting is manufactured, and the tip end thereof is milled to form the fitting protrusion, the fitting recess, and the locking hook.

Since these fitting protrusions and fitting recesses are of a substantially complementary type that fit with each other, the fitting recesses are cut at a predetermined interval so that the space between these fitting recesses is reduced. Is formed as a fitting protrusion. When milling such fitting protrusions and fitting recesses, one fitting recess is cut and formed in the above work, then this work is rotated by a specified angle, and the next fitting recess is formed. It is cut, and thus all the fitting protrusions and the fitting recesses are formed.

For example, if the number of the fitting projections and the number of the fitting recesses are each 6, the fitting recesses are 60 °.
Are formed at intervals. Further, as described above, since the fitting protrusion and the fitting recess are of a substantially complementary type so that they are fitted to each other, the fitting protrusion and the fitting recess are approximately 30.
Formed over a range of °.

Generally, in a milling machine, a work is fixed, and a milling tool moves in a uniaxial or biaxial direction along a predetermined locus to cut the work into a predetermined shape. In the cutting with this milling machine, the cutting surfaces of the respective parts are usually parallel to each other. Therefore, for example, the inner side surfaces on both sides of one fitting recess are parallel to each other, and the both side surfaces of the fitting protrusion formed between these fitting recesses are also parallel to each other. Therefore, for example, if one inner side surface or side surface on which the above-mentioned locking hook portion is formed is a radial surface passing through the central axis of this cylindrical coupling fitting body, the other inner side surface or side surface It will be inclined about 30 ° with respect to. Therefore, when these side surfaces and the inner side surface are fitted to each other, a radial component force is generated in the reaction force between them. Further, for example, the other side surface or the inner side surface is provided with an urging mechanism or the like that presses the engaging hook portion in the circumferential direction to engage it. Even in this case, the urging force of the urging mechanism includes component forces in the circumferential direction and the radial direction.

By the way, according to the results of various tests, it has been found that the component force as described above causes problems such as deterioration in smoothness of attachment and detachment of the fitting. That is, when coupling such a coupling fitting, the fitting protrusions of the pair of coupling fitting bodies are resisted against the biasing force of the biasing mechanism until the locking hooks are completely engaged. The fitting portion and the fitting concave portion are fitted in the axial direction, but in this case, when the radial component forces as described above become unbalanced in the fitting protrusions or the fitting concave portions, these coupling A desired radial repulsive force is generated in the metal fitting body, and a problem occurs such that the central axes of the pair of fitting metal fitting bodies are displaced or bent, and the smoothness at the time of this coupling or uncoupling is impaired. .

In order to solve such a problem, it may be considered that the one side surface or the inner side surface and the other side surface or the inner side surface are inclined at substantially the same angle with respect to the radial direction, for example, each 15 °. To be However, a large axial load acts on the one side surface or the inner side surface where the locking hook portion is formed when the internal pressure of the hose acts. For this reason, it is not preferable to incline the side surface or the inner side surface on which the locking hook portion on which such a load acts is formed with respect to the radial direction.

The fitting protrusion and the fitting recess are
In order to facilitate mutual fitting, it is preferable to form a taper shape in which the width in the circumferential direction becomes narrower toward the distal end or the inner part. The side surface and the inner surface of the recess are also inclined with respect to the axial direction, and the direction of the component force as described above becomes more complicated. In addition, a predetermined gap is formed between the fitting protrusion and the fitting recess to facilitate the fitting. Since the central axes of the connecting metal fitting bodies are likely to be displaced from each other or inclined to each other, smoothness of fitting is likely to be impaired by the above-mentioned undesired component force. Particularly, in the case of a fitting for a fire hose, smoothness and certainty at the time of this joining are important, and it is necessary to eliminate the above factors that impede the smoothness of fitting.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and there is no distinction between male and female, and a fitting for a hose composed of a pair of fittings having the same structure is fitted. Provides a smooth and reliable fitting, and a method for manufacturing the fitting.

[0014]

The present invention as set forth in claim 1, is a connection for connecting hoses to each other or a hose to another device.
A fitting, which is a pair of cylindrical fittings,
A sealing surface formed on the front end faces of these coupling metal fitting bodies and abutting against each other in the axial direction, and a plurality of fittings arranged in the circumferential direction surrounding the sealing surface from the coupling metal fitting body and projecting in the axial direction. The fitting projection and the fitting recess formed between them are provided, and the fitting projection has a width that becomes narrower toward the tip.
Is formed in a taper shape, and the fitting recess is
It is formed in a taper shape whose width narrows as it goes on,
The fitting protrusions and the fitting recesses of the pair of coupling metal fitting bodies are axially fitted to the mating recesses and the fitting projections of the mating fitting metal fitting bodies on the other side, and the mating protrusions and the mating projections of the mating fitting projections on the mating side Is formed on the fitting projection of the coupling metal fitting body in the circumferential direction to restrict the movement in the axial direction and to lock the pair of coupling metal fitting bodies in the axial direction. The side surface of the fitting protrusion and the inner side surface of the fitting recess are surfaces that pass through the central axis of the cylindrical coupling fitting body.

Therefore, when these fitting projections and fitting recesses are fitted to each other, the reaction force of each other or the urging force of the urging mechanism or the like basically acts only in the circumferential direction, and in the radial direction. Undesired component forces in other directions do not occur. Therefore, smooth and reliable fitting can be performed without impairing the smoothness of fitting.

[0016] The present invention described in 請 Motomeko 1 also said fitting projection is tapered to be narrower in accordance Yuku the tip and the mating recess of a width according Yuku to deeper It is formed in a tapered shape that becomes narrower.

Therefore, the fitting is facilitated and
Thus, even if the fitting protrusion and the fitting recess are tapered, an undesired component force is not generated and smooth fitting is not impaired. Further, in the present invention according to claim 2 , the engaging surface of the engaging hook portion is inclined in an overhang shape by a predetermined angle with respect to the circumferential direction, and separates the connecting metal fitting bodies from each other. When the directional load is applied, these locking hooks are fitted more strongly. Therefore,
When a load is applied due to internal water pressure or the like in the direction in which the coupling fitting bodies are pulled apart from each other, the locking hooks are more strongly fitted to each other, and the fitting fitting bodies are reliably prevented from coming off.

The present invention as set forth in claim 3 is a method for producing a connecting fitting body as set forth in claim 1, wherein the connecting fitting body has a substantially cylindrical shape. While holding the workpiece of FIG. 3 rotatably around its central axis, a milling tool that cuts the tip edge of the workpiece to form the fitting recess and fitting projection in the axial direction of the work. While movably held, the work is rotated and the milling tool is axially moved while cutting, and the cutting point of the milling tool is the fitting recess and the cutting point on the peripheral surface of the work. The fitting projection and the fitting recess are formed by moving along the contour of the fitting projection.

Therefore, all of the side surfaces or the inner side surfaces of the above-mentioned fitting protrusions and fitting recesses can be easily machined as radial planes so as to pass through the central axis of the fitting main body. In addition, since the work and the milling tool move in only a single direction, it is easy to control these movements in a predetermined relationship with each other. There is a feature that it can be easily implemented just by doing.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the fitting of the present invention is applied to a fitting for a fire hose. This coupling fitting is composed of a pair of coupling fitting bodies 1a having the same structure,
1b, and these coupling fitting bodies 1a, 1
Fire hoses 2a and 2b are connected to b, respectively.

Each of the fitting main bodies 1a and 1b is provided with a cylinder main body 3. The cylinder main body 3 has a substantially cylindrical shape, and a hose mounting portion 4 having sawtooth-shaped irregularities is formed on the inner peripheral surface thereof. Has been formed. Then, the ends of the fire-fighting hoses 2a and 2b are inserted into the hose mounting portion 4, and the outer peripheral surface of the hose is pressed against the hose mounting portion 4 by the caulking ring (not shown) from the inner peripheral surface of the hose. Attach this fire hose.

A cylindrical seal surface member 5 is screwed onto the inner peripheral surface of the front end portion of the cylinder body 3, and the front end surface of the seal surface member 5 is formed as a seal surface. A seal member 6 such as a rubber packing is attached. Therefore, when these connecting metal fitting bodies 1a and 1b are axially fitted and coupled to each other, these sealing members 6 abut each other to communicate with the inside of these tube main bodies 3 and to improve the sealing performance. To maintain.

A plurality of, for example, six fitting projections 8 are integrally provided at the front end of the cylinder body 3 so as to project integrally. These fitting projections 8 are arranged at equal intervals in the circumferential direction and project in the axial direction from the sealing surface of the sealing surface member 5. A fitting recess 7 is formed between the fitting protrusions 8, and the fitting main body 1 is formed.
When a and 1b are abutted against each other in the axial direction, the fitting protrusion 8 of the one fitting main body 1a fits into the fitting recess 7 of the other fitting main body 1b, and the other fitting The fitting protrusions 8 of the main body 1b are fitted into the fitting recesses 7 of the one fitting main body 1a, and are fitted in a complementary shape to each other.

In the first embodiment, the width of the fitting recess 7 is slightly wider than the width of the fitting projection 8. Therefore, the fitting protrusions 8 are fitted in the fitting recesses 7 in the axial direction and are rotatable in the circumferential direction by a predetermined amount.

Then, one side surface 8 of the above-mentioned fitting projection 8 is formed.
Stepped hook-shaped locking hooks 9 are formed in a, respectively, and these are configured to engage with the locking hooks of the mating protrusions on the other side in the circumferential direction. Therefore, in a state where the fitting protrusions 8 are fitted in the mating fitting recesses 7 in the axial direction, the coupling metal fitting bodies 1a and 1b are rotated with respect to each other, and one of the fitting protrusions 8 is rotated. When the side surfaces 8a come close to each other, these locking hooks 9 engage with each other as shown in FIG.
a and 1b are connected to each other. Incidentally. A curved portion 11 is formed at the base of each of the locking hooks 9 for preventing stress concentration at this portion. Further, the tip corners of the other side surface of these fitting protrusions are formed in an arc shape to form the guide portion 12, and when these are fitted, the guide portions 12 contact each other. . An elastic plug body 11a made of a material such as a flexible elastic foam material is filled and fixed in the curved portion 11, and foreign matters such as sand and mud are accumulated in the curved portion 11. This prevents the engagement of these locking hooks 9 from being hindered.

The engaging surfaces of these engaging hooks 11 are
When they are inclined by a predetermined angle with respect to the circumferential direction in an overhanging state, and when they are engaged with each other, a load in a wrinkle direction that separates the coupling metal fitting bodies 1a and 1b from each other by internal water pressure or the like is applied. The locking hooks 11 are more strongly fitted to each other, and are configured to reliably prevent the coupling fitting bodies 1a and 1b from coming off.

In this embodiment, a gap is formed between the tip end surface of the fitting projection 8 and the back wall surface of the fitting recess 7 in a state where the locking hook 9 is fitted. The dimensions of each part are set as follows. Therefore, this is movable such that the fitting projection 8 and the fitting recess 7 further enter in the axial direction from the engaged state of the locking hook 9.

Further, the other side surface 8 of these fitting projections 8
b is inclined with respect to the axial direction of the fitting main bodies 1a and 1b. Therefore, the fitting protrusion 8 is formed in a taper shape such that the width thereof in the circumferential direction becomes narrower as it goes to the tip end thereof, and the fitting recess 7 also becomes wider in the circumferential direction as it goes to the inner part thereof. Is tapered so that This facilitates the fitting of the fitting projection 8 and the fitting recess 7. In addition, the above-mentioned locking hook portion 9
One side surface on which the
It is formed substantially parallel to the axial directions of a and 1b.

Further, the other side surface 8 of these fitting protrusions 8
A biasing mechanism 10 is provided in each of b. These urging mechanisms 10 are composed of a urging member such as a steel ball 15 housed in a cylindrical case member 14 so as to project and retract, and a spring 16 for urging the steel ball 15 in the protruding direction. The urging mechanism 10 has the fitting protrusion 8
Embedded in the other side of. Therefore, when these fitting protrusions 8 are fitted in the mating fitting recesses 7 as shown in FIG. 3, the steel balls 15 come into contact with each other and press and urge each other. The other side surfaces of the projection 8 are biased away from each other, and as a result, the one side surfaces 8a of the fitting projections 8 are biased toward each other, and as described above, these one side surfaces The locking hooks 9 are urged to engage each other.

Further, a plurality of tool grooves 20 are formed on the outer peripheral surfaces of the coupling fitting bodies 1a and 1b. These tool grooves 20 are formed in a shape that can be fitted with a tool such as a wrench, and should these connecting metal fitting bodies 1 be used.
When the connection between a and 1b cannot be released due to the biting of sand or the like, a tool such as a wrench is fitted into these tool grooves 20 to forcibly rotate the connecting metal fitting bodies 1a and 1b. By doing so, the binding can be released.

A locking mechanism 21 is provided on each of the coupling fitting bodies 1a and 1b to lock them in a coupled state to prevent undesired disengagement of the coupling due to impact or the like. . Hereinafter, this lock mechanism 2
1 will be described with reference to FIGS.

That is, at the inner corner of the fitting recess 7, that is, at the base of the other inclined side surface 8b of the adjacent fitting projection 8, a lock pin 22 is provided so as to project in a substantially circumferential direction. . The lock pin 22 is made of an elastic material having a diameter of about 3 mm, for example, a piano wire, and is linear in a free state, but elastically bendable. In addition, a relief hole 23 having a diameter larger than the diameter of the lock pin 22 is formed in the root portion of the lock pin 22 that is provided in a protruding manner.
Is formed, and the lock pin 22 is configured to be freely bendable. In this escape hole 23,
In order to prevent clogging of sand, mud, etc., an elastic plug body 26 made of a material such as the above-mentioned flexible elastic foam material is filled and fixed.

This lock pin 22 is used for all fitting recesses 7
It may be provided in each of them, or may be formed only in a part of the fitting recesses 7. In this embodiment, these locking pins 22 are provided in every other fitting recess 7.
Thus, three lock pins 22 are provided on one coupling fitting body 1a, 1b.

A lock groove 24 is formed on the tip end surface of the fitting projection 8 in correspondence with the lock pins 22. As shown in FIG. 5, one end of the lock groove 24 is open to a corner of the fitting projection 8 and the other end of the lock groove 24 forms a rear wall and terminates. In addition, a chamfered portion 25 is formed on the inner wall portion for ensuring the escape when the lock pin 22 is released. The lock grooves 24 are formed on the tip surfaces of all the fitting protrusions 8. Therefore, even if these fitting protrusions 8 and fitting recesses 7 are fitted in any relationship, the mating lock pin 2
2 is configured to always correspond to these lock grooves 24.

In such a lock mechanism 21, when the fitting projection 8 is fitted into the fitting recess 7 and the engaging hook 9 is engaged, the lock pin 22 is moved to the above-mentioned position as shown in FIG. The fitting protrusion 8 is fitted into the lock groove 24 on the tip end surface thereof, and the tip end of the lock pin 22 abuts on the rear wall portion at the terminal end of the lock groove 24. Therefore, in this state, the coupling fitting bodies 1a and 1b are locked so as not to rotate in the circumferential direction in which the engagement hook portions 9 are disengaged from each other.

When the lock mechanism 21 is unlocked, as shown in FIG.
Are pressed axially in a direction in which they approach each other. Then, when the fitting projection 8 is axially moved to the inner part of the fitting recess 7 as shown in FIG. 6, the lock pin 22 is pressed against the tip end surface of the fitting projection 8 and elastically moves. Bend to. Therefore, the tip portion of the lock pin 22 has the above-mentioned lock groove 24.
This lock is released by slipping out from the inner part of the joint, and these coupling fitting bodies 1a and 1b are rotatable in the circumferential direction. Therefore, in this state, if the coupling metal fitting bodies 1a and 1b are rotated in the circumferential direction, the engagement of the locking hook portion 9 is released, and the coupling metal fitting bodies 1a and 1b are disengaged. You can In this case, since the chamfered portion 25 is formed in the inner portion of the lock groove 24, the tip end of the lock pin 22 does not get caught in the inner portion of the lock groove 24 and the lock groove 24 is not locked. Release is sure.

Further, in this coupling fitting, the side surface or the inner side surface of each of the fitting projections 8 or the fitting recesses 7 is constituted by a radial surface passing through the central axis of the fitting fitting body 1a, 1b. ing. That is, as shown in FIG. 7, one and the other side surfaces 8a and 8b (inner side surface of the fitting recess 7) of the fitting protrusion 8 and the surface forming the locking hook portion 9 are both Central axis O of coupling fitting bodies 1a, 1b
It is formed by a radial surface passing through.

Next, the operation of such a fitting will be described. When connecting the metal fitting bodies 1a and 1b, the metal fitting bodies 1a and 1b are made to concentrically face each other as shown in FIG. The part 8 is fitted into the mating recess 7 on the other side. In this case, all the fitting protrusions 8 have the same shape and six pieces are arranged at equal intervals, so that these fitting protrusions 8 are fitted with any mating recesses 7 on the other side. Can be combined. Therefore, in order to make the fitting projection 8 and the mating fitting recess 7 face each other, it is only necessary to relatively rotate the fitting main bodies 1a and 1b by a maximum of about 30 °, and connect them. It is not necessary to excessively twist the existing fire hose 2a, 2b, and the operation is easy.

When these are fitted in the axial direction, one side surface 8a or the other side surface 8b of the fitting projection 8 is formed.
The other side surfaces 8b are inclined, and the guide portions 12 are formed at the tip corner portions of the other side surfaces 8b, so that they are smoothly guided to each other and fit smoothly and securely. . Then, when the fitting projections 8 are fitted in the axial direction in this way, the steel balls 15 of the biasing mechanism 10 provided on the other side surface 8b press each other, and one of the fitting projections 8 is pushed. The side surfaces 8a of the above are urged so as to approach each other. Then, when the locking hook portions 9 formed on the one side surface 8a pass over each other's tip portions, these locking hook portions 9 are moved by the urging force of the urging mechanism 10 as shown in FIG. They are engaged with each other in the circumferential direction to be immovable in the axial direction, and in this state, the pair of coupling fitting bodies 1a,
1b is bound. As described above, in this state, the seal members 6 are pressed against each other and deformed by a predetermined amount to maintain the seal.

At the time of this fitting, the urging force of the urging mechanism 10 or the reaction force due to the contact of the side surfaces 8a and 8b, the locking hook portion 9 and the like acts. In this case, the side surfaces 8a and 8b and the locking hook portion 9 are each formed as a radial surface that passes through the central axis O of the fitting main body 1a or 1b. Therefore, the components of these reaction force and biasing force are basically only in the circumferential direction and the axial direction. Therefore, at the time of this fitting, a component force for displacing these coupling metal fitting bodies 1a and 1b in the radial direction is not generated. Therefore, at the time of this coupling, the forces acting on the coupling metal fitting bodies 1a and 1b mutually are only the axial force and the circumferential force, and it is possible to reliably prevent the central axes of these from shifting or inclining. A smooth and reliable fitting is achieved.

Further, in this embodiment, since the other side surface 8b is inclined, the reaction force between these side surfaces 8b and the biasing mechanism 10 formed on these side surfaces 8b.
The direction of urging force, etc. becomes complicated. However, since the other side surface 8b is also formed by the radial surface as described above, these component forces are only in the axial direction and the circumferential direction.
Smooth and reliable fitting can be performed as described above.

The smoothness at the time of fitting or unfitting as described above depends on the shape and size of the fitting projection 8 and the fitting recess 7,
It is affected by the gap between them. In the actual product, many prototypes are used under various conditions and an appropriate design is made.However, as mentioned above, the reaction force and the component force of the biasing force are basically only in the axial direction and the circumferential direction. The feature greatly contributes to the smoothness at the time of fitting and unfitting.

When the locking hooks 9 are engaged with each other as described above, the above-mentioned lock mechanism 21 locks the coupling fitting bodies 1a and 1b so that they cannot rotate in the circumferential direction. Therefore, even if a shock is applied to the fitting, or a load such as a twist is applied from the hose or the like, the joining of the fitting bodies 1a and 1b is not undesirably released.

Next, the fitting main body 1a in the joined state,
When uncoupling 1b, first, they are pressed so as to be close to each other in the axial direction, the lock of the locking mechanism 21 is released, and then the coupling fitting bodies 1a, 1b are twisted in opposite directions. As a result, the coupling fitting bodies 1a and 1b rotate against the urging force of the urging mechanism 10, and the engagement of the engagement hook portion 9 in the engagement state is released. And together with this, these coupling fitting bodies 1
If a and 1b are axially separated from each other, they are decoupled.

Next, referring to FIG. 8, a manufacturing method for processing the side surfaces 8a, 8b (inner side surfaces of the fitting recess 7) on both sides of the fitting projection 8 into the radial surface as described above will be described. And explain. First, the substantially cylindrical work W that constitutes the above-described coupling fitting bodies 1a and 1b is mounted on the work holding member 30 of the work holding bed mechanism 31. This work holding bed mechanism 3
1 is capable of rotating the work W about its central axis, that is, the direction around the X axis, that is, the A axis by an arbitrary angle, and the existing bed of the milling machine can be used. Next, the milling tool 32 is mounted on the tool head 33, and the milling tool 32 is oriented in a direction intersecting with the X axis of the central axis of the work W. This tool head 3
Reference numeral 3 denotes a tool capable of moving the milling tool 32 in the direction of the central axis of the work W, and a machining head or the like of an existing milling machine can be used as it is.

While rotating the work W,
The milling tool 32 is moved in the axial direction, and the cutting point of the milling tool 32 is set to the contour of the fitting recess 7 (the fitting projection 8).
The fitting recess 7 is cut at the tip of the work W to form the side surfaces 8a and 8b on both sides, the locking hook 9 and the like.

When the processing of one fitting recess 7 is completed, the work W is rotated by a predetermined angle and the next fitting recess 7 is processed in the same manner as described above. In this way
All the fitting recesses 7 are formed, and the fitting protrusions 8 are provided between them.
Is formed.

When actually performing the above-mentioned machining, when the center line of the milling tool 32 is aligned with the radial direction intersecting the center axis of the work W, the cutting point of the milling tool 32 is matched. Is displaced in the circumferential direction of the work W by that radius. When the milling tool 32 is used to cut a surface inclined with respect to the X-axis of the work W, such as the other side surface 8b described above, or an arcuate portion, this cutting point is displaced in the circumferential direction. Minutes change further. In order to correct these deviations, the tool head 33 described above moves the X of the workpiece W.
It is configured to be movable in the direction orthogonal to the axis, that is, in the Y-axis direction, and corrects the deviation due to the diameter of the milling tool 32 and the cutting movement direction as described above.

According to such a manufacturing method, since the cutting point of the milling tool 32 is always directed to the central axis of the workpiece W when cutting the side surfaces 8a and 8b, these side surfaces are joined. It can be machined as a radial surface passing through the central axis of the metal fitting body. Such a manufacturing method,
As described above, the existing facility or the existing facility can be implemented only by making minor modifications, and the cost can be reduced. The present invention is not limited to the above embodiment.
For example, the shapes of the fitting protrusion and the fitting recess are not necessarily limited to those in the above embodiment.

[0050]

As described above, in the joint fitting of the present invention, since the side surfaces of the fitting projection and the fitting recess are formed by the radial surface passing through the central axis of the fitting body, the fitting of these fittings can be prevented. The component force of the reaction force and the urging force at that time is only the component force in the axial direction and the circumferential direction. Therefore, when the fitting is performed, the center axis line is not displaced or tilted, and the fitting can be smoothly and reliably performed.

Further, the manufacturing method of the present invention can easily and accurately manufacture the above-mentioned fitting protrusions and fitting recesses, and can be easily carried out using existing equipment or the like. it can.

[Brief description of drawings]

FIG. 1 is a perspective view of a coupling fitting according to an embodiment of the present invention.

FIG. 2 is a side view and a vertical cross-sectional view of the coupling fitting according to the embodiment of the present invention.

FIG. 3 is a plan view of a fitting recess and a fitting projection.

FIG. 4 is an enlarged plan view of a fitting recess and a fitting projection.

FIG. 5 is a perspective view of a lock mechanism.

FIG. 6 is an enlarged plan view of the fitting recess and the fitting projection in the unlocked state.

7 is a view on arrow 7-7 of FIG.

FIG. 8 is a perspective view illustrating a manufacturing method.

[Explanation of symbols]

1a, 1b Main fitting body 7 Fitting recess 8 Mating protrusion 8a One side surface 8b the other side 9 Locking hook 10 Biasing mechanism 21 Lock mechanism

Continuation of the front page (56) References JP-A 1-216196 (JP, A) JP-A 4-283037 (JP, A) Actual Opening 6-14681 (JP, U) Actual Opening 61-96076 (JP , U) Actual development Sho-48-59415 (JP, U) Actual development Sho-59-43779 (JP, U) Actual public Sho-7-1526 (JP, Y1) Japanese Patent Publication No. 7-504019 (JP, A) Patent 98187 ( JP, C2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16L 37/24

Claims (3)

(57) [Claims] 1. A coupling fitting for coupling hoses to each other or a hose to another device, wherein a pair of coupling fitting bodies having a cylindrical shape are formed on the front end faces of these coupling fitting bodies, and the fitting fittings are axially opposed to each other. A mating sealing surface, a plurality of fitting projections arranged around the sealing surface from the coupling fitting body in the circumferential direction and projecting in the axial direction, and a fitting recess formed between them. And the mating protrusions follow the tip.
Taper to narrow the width, and
The part is formed in a taper shape whose width becomes narrower toward the back.
Have been, fitting projection and the fitting recess of the pair of fitting body fitted axially into the mating recess and the fitting projection of the mating fitting body to each other and these fitting projections Is formed with a locking hook part that engages with the fitting projection of the mating fitting body in the circumferential direction to restrict axial movement and locks the pair of fitting hardware in the axial direction. The fitting fitting for a hose is characterized in that the side surface of the fitting projection and the inner surface of the fitting recess are surfaces that pass through the central axis of the cylindrical fitting fitting body. 2. The engaging surfaces of the engaging hooks are circumferentially opposed to each other.
Then, it is inclined in the overhang shape by a predetermined angle,
A load is applied in the direction that separates the connecting metal fittings from each other.
If these are engaged, these locking hooks will fit more strongly.
The hose joint metal according to claim 1, wherein
Ingredient 3. A plurality of elements arranged in the circumferential direction and projecting in the axial direction.
The mating protrusions and the mating recesses formed between them are provided.
However, the width of the above fitting protrusion becomes narrower as it goes to the tip.
It is formed in a tapered shape, and the above-mentioned fitting recess is moved inward.
It is formed in a taper shape whose width becomes narrower as
The mating protrusions and mating recesses of the pair of fittings do not
Axial fit in the mating recess and mating protrusion of the hand side fitting
The side of the fitting protrusion and the fitting recess described above.
The side surface is a surface that passes through the central axis of the above cylindrical coupling fitting body.
And the mating protrusions have mating metal fittings on the mating side.
It is locked to the fitting protrusion of the body in the circumferential direction to restrict axial movement.
Locking hooks that lock the pair of fittings in the axial direction
Are formed, and these fitting protrusions and fitting recesses are
A pair of substantially cylindrical metal fittings that are fitted and joined to
A method of manufacturing, comprising forming the fitting body as described above.
Substantially cylindrical workpiece times the heart middle of the central axis line for
Hold it movably and cut the tip edge of this work.
Fly that is ground to form the above-mentioned fitting recess and fitting projection
Hold the tool so that it can move in the axial direction of the above work, and
Rotate the above work and use the above milling tool.
Cutting while moving in the axial direction, the cutting of the above milling tools
The cutting point is set on the peripheral surface of the work described above with the fitting recess and the fitting
Move along the contour of the mating protrusion and
Hose coupling fitting characterized by forming a fitting recess
Manufacturing method.