JP2022014104A - Joint fitting - Google Patents

Abstract

To effectively suppress unexpected detachment of a receiving fitting and an insert fitting.SOLUTION: In a plug-in type joint fitting comprising a push ring, an insert fitting provided with a convex part, and a receiving fitting provided with a claw, the push ring has a tip part for pushing up the claw and a rear end part located on the opposite side of the tip part in an axial direction. A receiving port has a protrusion part that protrudes toward the insert fitting side in the axial direction and covers the rear end part from the outside, in a state where the insert fitting is inserted into the receiving fitting and the convex part and the claw are engaged with each other.SELECTED DRAWING: Figure 1

Description

The present invention relates to a plug-in type connecting metal fitting in which both metal fittings are connected by inserting the metal fitting into the metal fitting.

As a metal fitting for connecting fire hoses to each other, a plug-in type joint metal fitting having a male metal fitting, a metal fitting, and a female metal fitting, a receiving metal fitting, is known (see, for example, Patent Documents 1 and 2). .. In this coupling metal fitting, the metal fitting is formed by engaging the annular convex portion provided at the tip of the metal fitting with a plurality of claws provided on the receiving metal fitting and urged toward the inside of the metal fitting. It is prevented from coming off against the bracket.

Each claw is movable in the radial direction about the axis of the receiving metal fitting, and is in contact with the outer peripheral surface of the metal fitting at the time of joining. Further, the metal fitting is equipped with a push ring that can slide along the outer peripheral surface thereof. By pushing up each claw in the radial direction with this push ring, the engagement between each claw and the convex portion is released, and the metal fitting can be received and pulled out from the metal fitting.

In actual fire extinguishing activities, when the fitting comes into contact with an obstacle at the site, the push ring may be pushed and the fitting and the receiving fitting may come off. In this regard, Patent Documents 1 and 2 propose a structure of a coupling fitting for suppressing an unintended detachment.

In the coupling fitting disclosed in Patent Document 1, a non-slip groove is formed on the outer peripheral surface of the insert fitting and the inner peripheral surface of the push ring, and a gap is provided between the outer peripheral surface and the inner peripheral surface. As a result, when an uneven force is applied to the push ring due to an obstacle, a part of the tip of the push ring is lifted from the outer peripheral surface of the metal fitting and the other part comes into contact with the outer peripheral surface. Since the groove on the outer peripheral surface of the metal fitting and the inner peripheral surface of the push ring engage with each other at the contacted portion, the movement of the push ring is restricted, and the tip of the push ring does not reach the claw.

In the metal fitting disclosed in Patent Document 2, a protective frame extending in the axial direction is provided around the metal fitting, and the protective frame is located closer to the metal fitting than the flange portion of the push ring (release member) at the time of coupling. There is. Furthermore, the protective frame has elasticity, and even if an obstacle comes into contact with the push ring, the tip of the push ring is not subjected to sufficient force to elastically deform the inner edge of the protective frame and move the flange portion to the receiving port side. Does not reach the nail.

Japanese Unexamined Patent Publication No. 2016-14477 Japanese Unexamined Patent Publication No. 2018-31464

Even in light of the coupling fittings disclosed in Patent Documents 1 and 2, there is still room for various improvements in the structure for suppressing the unintentional detachment of the receiving fitting and the fitting. For example, in any of the coupling fittings disclosed in Patent Documents 1 and 2, detachment cannot be sufficiently suppressed depending on the angle at which the push ring is pushed by the obstacle and the degree of force.

Therefore, one of the objects of the present invention is to provide an improved coupling fitting capable of more effectively suppressing the unintentional detachment of the receiving fitting and the insertion fitting.

In the coupling metal fitting according to one aspect of the present invention, the metal fitting provided on the outer peripheral surface of the metal fitting is provided on the outer peripheral surface of the metal fitting by inserting the metal fitting provided on the metal fitting into the metal fitting provided on the metal fitting. A claw urged toward the axis of the receiving metal fitting engages in an axial direction parallel to the axis, and a push ring provided so as to be slidable in the axial direction with respect to the outer peripheral surface is provided with the claw and the outer periphery. By moving it between the surfaces and pushing up the claw in the radial direction about the axis, the engagement between the convex portion and the claw is released. The push ring has a tip portion for pushing up the claw and a rear end portion located on the opposite side of the tip portion in the axial direction. The receiving port projects toward the insertion fitting side in the axial direction in a state where the insertion fitting is inserted into the receiving fitting and the convex portion and the claw are engaged with each other, and the rear end portion thereof is formed. It has a protrusion that covers from the outside.

Even if the radial gap is formed between the protruding portion and the rear end portion in a state where the insert fitting is inserted into the receiving fitting and the convex portion and the claw are engaged with each other. good. For example, the receiving port may further include a claw ring that covers the claw from the outside and a protective member mounted on the outer peripheral surface of the claw ring, and the protective member may have the protrusion. For example, the socket may further include a claw ring that covers the claw from the outside, and the claw ring may have the protrusion.

The protrusion may have a plurality of communication portions that communicate the outside and the inside of the protrusion in the radial direction. The communicating portion is provided on the outer peripheral surface of the protruding portion along the axial direction, and at one end of the communicating portion in the axial direction, the insert fitting is inserted into the receiving metal fitting, and the convex portion and the claw are formed. In the engaged state, it is located on the tip end side of the protrusion with respect to the end surface of the rear end portion, and at the other end of the communication portion in the axial direction, the insert fitting is inserted into the receiving fitting. With the convex portion and the claw disengaged, the protrusion may be located closer to the base end portion of the protruding portion than the end surface of the rear end portion.

The end surface of the tip end portion of the protruding portion may protrude from the end surface of the rear end portion in a state where the insert fitting is inserted into the receiving metal fitting and the convex portion and the claw are engaged with each other.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide an improved coupling fitting capable of effectively suppressing an unintended detachment of the receiving fitting and the insertion fitting.

FIG. 1 is a partial cross-sectional view of the fitting according to the first embodiment. FIG. 2 is a partial cross-sectional view of a coupling fitting in a state where the receiving port and the insertion port according to the first embodiment are connected. FIG. 3 is a partial cross-sectional view of a coupling fitting in a state where the receiving port and the insertion port according to the first embodiment are connected. FIG. 4 is a comparative example of the coupling fitting according to the first embodiment. FIG. 5 is a diagram showing the state of the fitting shown in FIG. 4 at the site of fire extinguishing activity. FIG. 6 is a diagram showing a state of the fitting according to the first embodiment at the site of fire extinguishing activity. FIG. 7 is a partial cross-sectional view of the socket according to the second embodiment. FIG. 8 is a partial cross-sectional view of the coupling fitting in a state where the receiving port and the insertion port according to the second embodiment are connected.

Hereinafter, some embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
In this embodiment, a plug-in type joint fitting that is expected to be used mainly in the field of fire fighting will be exemplified. However, the metal fitting can be used for various purposes other than the field of firefighting, such as connecting flow paths for industrial and agricultural purposes.

FIG. 1 is a partial cross-sectional view of the coupling fitting C1 according to the first embodiment. The coupling metal fitting C1 includes a receiving port F1 and an insertion port M1. The receiving port F1 includes a cylindrical receiving metal fitting 1 (female metal fitting) centered on the shaft AX1. The insertion port M1 includes a cylindrical insertion fitting 2 (male fitting) centered on the shaft AX2.

In FIG. 1, the receiving metal fitting 1 and the metal fitting 2 are arranged so that the shafts AX1 and AX2 are aligned with each other. In this state, the direction parallel to the axes AX1 and AX2 is defined as the axial direction Dx. The direction away from the axes AX1 and AX2 with the axes AX1 and AX2 as the center is defined as the radial direction Dr. Further, as shown in FIG. 1, the circumferential direction Dθ centered on the axes AX1 and AX2 is defined.

The receiving metal fitting 1 has a first end portion 1a and a second end portion 1b in the axial direction Dx. A first flow path 10 is formed inside the receiving metal fitting 1. The receiving metal fitting 1 has a mounting portion 11 inserted into the end portion of the fire hose on the first end portion 1a side, and has a diameter-expanded portion 12 having a larger outer diameter than the mounting portion 11 on the second end portion 1b side. Have. On the outer peripheral surface of the mounting portion 11, a plurality of annular steps arranged in the axial direction Dx for preventing the fire hose from coming off are formed. The second end portion 1b of the receiving metal fitting 1 projects toward the axis AX1 in the entire circumferential direction Dθ.

The receiving port F1 further includes an annular squeeze ring 3 connected to the enlarged diameter portion 12 and a cylindrical protective member 4 mounted on the outer peripheral surface of the squeeze ring 3. The tightening ring 3 is made of a metal material and is connected to the enlarged diameter portion 12 by, for example, a plurality of screws. The tightening ring 3 has a second end portion 1b and an annular portion 31 facing the axial direction Dx. The annular portion 31 projects toward the axis AX1 in the entire circumferential direction Dθ. The protective member 4 is made of rubber, for example, and its outer peripheral surface protrudes most in the radial direction at the receiving port F1 and the insertion port M1. The protective member 4 is also called, for example, a tire or a band.

The receiving port F1 further includes a plurality of claws 5 covered from the outside by the claw ring 3, a sealing material 6 arranged inside the enlarged diameter portion 12, and a claw seat 7 for holding the plurality of claws 5. .. The plurality of claws 5 have an arc shape along the circumferential direction Dθ, and are arranged in the circumferential direction Dθ at equal intervals. The sealing material 6 is, for example, an annular rubber packing. The claw seat 7 is fixed to the receiving metal fitting 1 by the tightening ring 3, and is arranged between the second end portion 1b and the annular portion 31. The plurality of claws 5 can move in the radial direction Dr between the claw seat 7 and the second end portion 1b. The plurality of claws 5 are urged toward the shaft AX1 by, for example, an elastic member 50 which is a leaf spring.

The protective member 4 has a protrusion 41. That is, the receiving port F1 has a protruding portion 41. The protrusion 41 is a part of the protective member 4 and is integrally formed with the protective member 4. The protruding portion 41 protrudes along the axial direction Dx. Further, the protruding portion 41 may be formed of a separate component from the protective member 4 and may be detachably attached to the protective member 4. The protruding portion 41 has a tip portion 41a and a base end portion 41b on the squeeze ring 3 side in the axial direction Dx. The outer peripheral surface 41c of the protrusion 41 may be parallel to the axial direction Dx. The end surface 41d of the tip portion 41a may be parallel to the radial direction Dr or may be a curved surface. The protrusion 41 has a communication portion 42 that communicates the outside and the inside of the protrusion 41 in the radial direction Dr. The communication portion 42 is provided on the outer peripheral surface 41c of the protruding portion 41 along the axial direction Dx. The plurality of communication portions 42 may be arranged at equal intervals in the circumferential direction Dθ of the protruding portions 41, or may be arranged at unequal intervals. The number of communication portions 42 is not limited to a plurality.

The communication portion 42 has one end 42a on the tip end portion 41a side and the other end 42b on the base end portion 41b side in the axial direction Dx. In the example shown in FIG. 1, the communication portion 42 has a notch shape formed from the tip portion 41a of the protrusion portion 41 toward the base end portion 41b, and the end surface 41d and one end 42a of the tip portion 41a coincide with each other. There is. The shape of the communication portion 42 is not limited to the notch shape. The width W of the communication portion 42 in the circumferential direction Dθ may be long enough for a worker such as a firefighter to work. For example, the width W may be long enough to accommodate the thumb of the operator. The width W of the communication portion 42 may be constant from one end 42a to the other end 42b, or may be formed in a tapered shape such that the width W becomes narrower from one end 42a to the other end 42b.

The metal fitting 2 has a first end portion 2a and a second end portion 2b in the axial direction Dx. A second flow path 20 is formed inside the metal fitting 2. The insert metal fitting 2 has a mounting portion 21 inserted into the end portion of another fire-fighting hose different from the fire-fighting hose on the receiving metal fitting 1 side on the first end portion 2a side, and is slightly radial to the periphery. A protruding annular convex portion 22 is provided on the second end portion 1b side. Similar to the mounting portion 11, a plurality of annular steps are formed on the outer peripheral surface of the mounting portion 21.

The insertion port M1 includes an annular retaining ring 8 fixed to the outer peripheral surface 2c of the fitting 2 between the mounting portion 21 and the convex portion 22, and a push ring 9 provided between the convex portion 22 and the retaining ring 8. Is further equipped. The retaining ring 8 is, for example, a metal wire attached to an annular groove provided on the outer peripheral surface 2c, and at least a part thereof protrudes from the outer peripheral surface 2c in the radial direction Dr.

The push ring 9 has a cylindrical shape that surrounds the outer peripheral surface 2c. The push ring 9 has a tip portion 91 on the second end portion 2b side for pushing up the claw 5 in a state where the convex portion 22 and the claw 5 described later are engaged with each other, and is opposite to the tip portion 91 in the axial direction Dx. It has a rear end 92 located on the side. As shown in FIG. 1, the rear end portion 92 is provided with, for example, a flange portion that protrudes toward the side opposite to the axis AX2 in the entire circumferential direction Dθ. The push ring 9 is prevented from coming off from the metal fitting 2 by the convex portion 22 and the retaining ring 8. The push ring 9 is not fixed to the outer peripheral surface 2c of the metal fitting 2. The push ring 9 is slidable in the axial direction Dx with respect to the outer peripheral surface 2c between the convex portion 22 and the retaining ring 8. Further, the push ring 9 can rotate in the circumferential direction Dθ with respect to the outer peripheral surface 2c in both the state where the insertion port M1 and the receiving port F1 are not connected and the state where the insertion port M1 and the receiving port F1 are connected.

2 and 3 are partial cross-sectional views of the coupling fitting C1 in a state where the receiving port F1 and the insertion port M1 according to the first embodiment are connected. FIG. 2 shows a state in which the insert fitting 2 is inserted into the receiving bracket 1 and the convex portion 22 and the claw 5 are engaged with each other, and FIG. 3 shows the insert fitting 2 inserted into the receiving metal fitting 1 and the convex portion 22. The claw 5 is in a disengaged state. In the state where the receiving port F1 and the insertion port M1 are connected, the receiving metal fitting 1 and the insertion metal fitting 2 are in a state where the shafts AX1 and AX2 are aligned.

FIG. 2 describes a flow from inserting the metal fitting 2 into the metal fitting 1 and engaging the convex portion 22 with the claw 5. When connecting the receiving port F1 and the insertion port M1, first, the second end portion 2b of the insertion fitting 2 is inserted into the enlarged diameter portion 12 of the fitting fitting 1 through the opening of the tightening ring 3. At this time, the convex portion 22 pushes up the claw 5 in the radial direction against the urging force of the elastic member 50. As a result, as shown in FIG. 2, the insert fitting 2 is inserted into the receiving fitting 1 to a position where the second end portion 2b comes into contact with the inner surface of the enlarged diameter portion 12.

In a state where the second end portion 2b is in contact with the inner surface of the enlarged diameter portion 12, the first flow path 10 formed inside the receiving metal fitting 1 and the second flow path 20 formed inside the insertion metal fitting 2 Is connected. At this time, the lip of the sealing material 6 comes into contact with the outer peripheral surface 22a of the convex portion 22, and the gap between the receiving metal fitting 1 and the inserting metal fitting 2 is kept liquidtight. Further, the claw 5 comes into contact with the outer peripheral surface 2c of the metal fitting 2 by the urging force of the elastic member 50. In this state, a part of the claw 5 faces the convex portion 22 in the axial direction Dx, and the convex portion 22 and the claw 5 engage with the axial direction Dx. In this state, the receiving metal fitting 1 and the metal fitting 2 cannot be separated.

FIG. 3 describes a flow from the state in which the insert fitting 2 is inserted into the receiving fitting 1 to the disengagement of the convex portion 22 and the claw 5. When the receiving metal fitting 1 and the inserting metal fitting 2 are disengaged, the push ring 9 is used to disengage the convex portion 22 and the claw 5. Specifically, when the push ring 9 is pushed toward the claw 5 as shown by the arrow A in FIG. 3, the push ring 9 slides in the axial direction Dx with respect to the outer peripheral surface 2c of the insert fitting 2. For example, the push ring 9 can be slid by the operator by pushing the end surface 92a of the rear end portion 92 in the direction indicated by the arrow A with the thumbs of both hands. At this time, the tip portion 91 of the push ring 9 faces the claw 5 through the gap between the annular portion 31 of the squeeze ring 3 and the outer peripheral surface 2c and the gap between the claw seat 7 and the outer peripheral surface 2c, and the tip portion 91 eventually comes into contact with the claw 5. .. Further, when the push ring 9 is pushed in the direction indicated by the arrow A, the claw 5 is pushed up in the radial direction Dr against the urging force of the elastic member 50, and the engagement between the convex portion 22 and the claw 5 is released. Then, the receiving metal fitting 1 and the inserting metal fitting 2 can be separated from each other.

2 and 3, a protrusion 41 in a state where the receiving port F1 and the insertion port M1 are connected will be described. The projecting portion 41 projects toward the insert fitting 2 side in the axial direction Dx in a state where the insert fitting 2 is inserted into the receiving metal fitting 1 and the convex portion 22 and the claw 5 are engaged with each other, and the rear end portion 92 Is covered from the outside. As for the positional relationship between the tip portion 41a of the protrusion 41 and the rear end portion 92, the end surface 41d of the tip portion 41a of the protrusion 41 is in a state where the push ring 9 is in contact with the retaining ring 8 as shown in FIG. , Protruding from the end surface 92a of the rear end portion 92. As another example, in a state where the push ring 9 is in contact with the retaining ring 8, the positions of the end surface 41d of the front end portion 41a and the end surface 92a of the rear end portion 92 may be the same. Since the rear end portion 92 is covered from the outside by the protruding portion 41, an obstacle or the like does not hit the end surface 92a of the rear end portion 92 from the outside.

A gap G in the radial direction Dr is formed between the inner peripheral surface of the protruding portion 41 and the rear end portion 92 over the entire circumferential direction Dθ. The gap G is formed, for example, in a range in which the push ring 9 can slide in the axial direction Dx between the convex portion 22 and the retaining ring 8. The gap G is formed in both the states of FIGS. 2 and 3, and the movement of sliding the push ring 9 in the axial direction Dx is not hindered by the protrusion 41.

The protrusion 41 has a plurality of communication portions 42 as shown in FIG. One end 42a of the communication portion 42 has a tip portion 41a of the protruding portion 41 rather than the end surface 92a of the rear end portion 92 in a state where the insertion fitting 2 is inserted into the receiving fitting 1 and the convex portion 22 and the claw 5 are engaged with each other. Located on the side. In the examples shown in FIGS. 2 and 3, the end face 41d and one end 42a of the tip portion 41a coincide with each other. On the other hand, at the other end 42b of the communication portion 42, as shown in FIG. 3, the end surface of the rear end portion 92 is in a state where the insert fitting 2 is inserted into the receiving fitting 1 and the convex portion 22 and the claw 5 are disengaged. It is located closer to the base end portion 41b of the protruding portion 41 than the 92a. Further, since the width W of the communication portion 42 is long enough for the operator to work, the operator can insert the thumb into the push ring 9 through, for example, the communication portion 42. Can be reached.

From the above, even if the receiving port F1 has the protruding portion 41, the operator can release the engagement between the convex portion 22 and the claw 5 from the state in which the convex portion 22 and the claw 5 are engaged (FIG. 2). The push ring 9 can be slid to the state (FIG. 3). Further, since the plurality of communication portions 42 are evenly arranged in the circumferential direction Dθ, the operator can easily perform the detachment operation.

FIG. 4 is a comparative example of the coupling fitting C1 according to the first embodiment. The coupling fitting C2 shown in FIG. 4 is different from the coupling fitting C1 shown in FIGS. 2 and 3 in that the receiving port F2 does not have the protruding portion 41. That is, the protective member 40 does not have a protrusion 41. Since the receiving port F2 does not have the protruding portion 41, there is nothing that covers the rear end portion 92 of the push ring 9 from the outside. Since the rear end portion 92 of the push ring 9 can be easily reached from the outside, the end surface 92a of the rear end portion 92 may hit an obstacle or the like at the site of fire extinguishing activity.

For example, there is a possibility that the end surface 92a of the rear end portion 92 is caught on a step of a staircase, the push ring 9 is pushed toward the receiving port F2 side, and the push ring 9 slides. This may cause the receiving metal fitting 1 and the metal fitting 2 to be unintentionally detached (erroneously detached) at the site of fire extinguishing activity.

FIG. 5 is a diagram showing a state of the coupling fitting C2 shown in FIG. 4 at the site of fire extinguishing activity. FIG. 6 is a diagram showing a state of the coupling fitting C1 according to the first embodiment at the site of fire extinguishing activity. In FIGS. 5 and 6, the coupling fittings C1 and C2 are located on the stairs S. As obstacles at the site of fire extinguishing activities, various obstacles such as pillars and walls can be assumed in addition to the stairs S.

The coupling fitting C2 of FIG. 5 includes a socket F2 having no protrusion 41, and the coupling fitting C1 of FIG. 6 has a socket F1 having a protrusion 41. Fire hoses H1 and H2 are connected to the mounting portion 11 of the receiving bracket 1 and the mounting portion 21 of the plug fitting 2, respectively. A firefighter T is placed at the end opposite to the end H1a connected to the receiving metal fitting 1 of the fire hose H1, and the side opposite to the end H2a connected to the metal fitting 2 of the fire hose H2. A pump P is arranged at the end of the hose. In the examples shown in FIGS. 5 and 6, it is assumed that a force is applied as shown by arrow B. That is, the fire hose H2 is pulled from the pump P side.

In FIG. 5, the corner portion SL of the step of the stairs S is located between the rear end portion 92 of the push ring 9 and the end portion H2a of the fire hose H2. When the fire hose H2 is pulled from the pump P side and a force is applied as shown by the arrow B, the end surface 92a of the rear end portion 92 is caught on the corner portion SL. Then, when a force is applied as shown by arrow B in a state where the end surface 92a of the rear end portion 92 is hooked on the corner portion SL, the end surface 92a of the rear end portion 92 is pushed by the corner portion SL, and the push ring 9 is axially oriented. Slide toward the socket F2 side with Dx. Further, when a force is applied as shown by the arrow B, the end surface 92a is pushed by the corner portion SL, and the push ring 9 slides and is pushed toward the receiving port F2 side. As a result, the engagement between the convex portion 22 and the claw 5 is released as described with reference to FIG. In the fire extinguishing activity using the fire-fighting hoses H1 and H2 coupled by the coupling metal fitting C2 in this way, when the coupling metal fitting C2 hits an obstacle such as a staircase S, the push ring 9 is unintentionally pushed to the metal fitting 2. The receiving metal fitting 1 may come off.

In FIG. 6, the corner SL of the step of the stairs S is located between the tip 41a of the protrusion 41 and the end H2a of the fire hose H2. When the fire hose H2 is pulled from the pump P side and a force is applied as shown by the arrow B, the end surface 41d of the tip portion 41a of the protrusion 41 is caught by the corner portion SL. Since the rear end portion 92 is covered from the outside by the protrusion 41 as described with reference to FIGS. 2 and 3, the end surface 92a of the rear end portion 92 is formed on the corner SL, unlike the example shown in FIG. Not hit. Even if a force is applied as shown by arrow B while the end surface 41d of the tip portion 41a is caught on the corner portion SL, the end surface 92a of the rear end portion 92 is not pushed by the corner portion SL, so that the push ring 9 is axially Dx. Do not slide with. Therefore, unlike the example shown in FIG. 5, the engagement between the convex portion 22 and the claw 5 is not disengaged.

According to the first embodiment described above, it is possible to provide the coupling fitting C1 capable of effectively suppressing the unintended detachment of the receiving fitting 1 and the insertion fitting 2. That is, since the rear end portion 92 of the push ring 9 is covered from the outside by the protruding portion 41 of the receiving port F1, the rear end portion 92 of the push ring 9 does not hit an obstacle or the like at the site of fire extinguishing activity. In other words, the protrusion 41 becomes a cover that covers the push ring 9.

In the fire extinguishing activity using the fire-fighting hoses H1 and H2 coupled by the coupling fitting C2 as described with reference to FIG. 5, when the coupling fitting C2 hits some obstacle, the push ring 9 is unintentionally pushed and the insertion fitting 2 And the receiving metal fitting 1 may come off. Such withdrawal can lead to a significant delay in fire extinguishing activities. Further, if the coupling fitting C2 is detached while the pressure is held in the fire hoses H1 and H2, it may lead to a serious accident such as an injury.

On the other hand, in the case of the fire-fighting hoses H1 and H2 coupled by the coupling fitting C1 according to the first embodiment, the receiving port F1 has the protruding portion 41, and the rear end portion 92 of the push ring 9 is outside by the protruding portion 41. Since it is covered from the hose, there is no possibility that the push ring 9 is pushed and the insertion fitting 2 and the receiving fitting 1 are separated from each other. Therefore, it is possible to effectively suppress the unintentional detachment of the receiving metal fitting 1 and the metal fitting 2.

Even if the receiving port F1 has the protruding portion 41, the operator can reach the push ring 9 from the outside to the inside of the protruding portion 41 via the communication portion 42. Since a gap G in the radial direction Dr is formed between the inner peripheral surface of the protrusion 41 and the rear end portion 92, the movement of sliding the push ring 9 in the axial direction Dx is hindered by the protrusion 41. There is no such thing. That is, even if the receiving port F1 has the protruding portion 41, the operator's disconnection operation of the coupling fitting C1 is not hindered.

[Second Embodiment]
The second embodiment will be described. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

FIG. 7 is a partial cross-sectional view of the socket F3 according to the second embodiment. In the second embodiment, the tightening ring 30 has a protruding portion 32. That is, the receiving port F3 has a protruding portion 32. The protrusion 32 is a part of the tightening ring 30 and is integrally formed with the tightening ring 30. The projecting portion 32 projects along the axial direction Dx. Further, the protruding portion 32 may be formed of a separate part from the squeeze ring 30 and may be detachably attached to the squeeze ring 30. The receiving port F3 is different from the first embodiment in that the tightening ring 30 has a protruding portion 32. In the example shown in FIG. 7, the protruding portion 32 protrudes from the annular portion 31 in a cylindrical shape along the axial direction Dx. The protruding portion 32 has a tip portion 32a and a base end portion 32b on the protective member 40 side in the axial direction Dx. The outer peripheral surface 32c of the protrusion 32 may be parallel to the axial direction Dx. The end surface 32d of the tip portion 32a may be parallel to the radial direction Dr or may be a curved surface.

The protrusion 32 has a communication portion 33 that communicates the outside and the inside of the protrusion 32 in the radial direction Dr. The communication portion 33 is provided on the outer peripheral surface 32c of the protrusion 32 along the axial direction Dx. The plurality of communicating portions 33 may be arranged at equal intervals in the circumferential direction Dθ of the protruding portions 32, or may be arranged at unequal intervals. The number of communication portions 33 is not limited to a plurality. The communication portion 33 has one end 33a on the tip end portion 32a side and the other end 33b on the base end portion 32b side in the axial direction Dx.

FIG. 8 is a partial cross-sectional view of the coupling fitting C3 in a state where the receiving port F3 and the insertion port M1 according to the second embodiment are connected. FIG. 8 shows a state in which the insert fitting 2 is inserted into the receiving fitting 1, and the convex portion 22 and the claw 5 are engaged with each other. The flow until the insertion metal fitting 2 is inserted into the metal fitting 1 and the convex portion 22 and the claw 5 are engaged with each other, and the engagement between the convex portion 22 and the claw 5 is released from the state where the metal fitting 2 is inserted into the receiving metal fitting 1. The flow up to this point is as described with reference to FIGS. 2 and 3.

The protruding portion 32 protrudes toward the insert fitting 2 side in the axial direction Dx in a state where the insert fitting 2 is inserted into the receiving metal fitting 1 and the convex portion 22 and the claw 5 are engaged with each other, and the rear end portion 92 Is covered from the outside. As for the positional relationship between the tip portion 32a of the protrusion 32 and the rear end portion 92, the end surface 32d of the tip portion 32a of the protrusion 32 is in a state where the push ring 9 is in contact with the retaining ring 8 as shown in FIG. , Protruding from the end surface 92a of the rear end portion 92. As another example, in a state where the push ring 9 is in contact with the retaining ring 8, the positions of the end surface 32d of the front end portion 32a and the end surface 92a of the rear end portion 92 may be the same. As in the first embodiment, since the rear end portion 92 is covered from the outside by the protruding portion 32, an obstacle or the like does not hit the end surface 92a of the rear end portion 92 from the outside. A gap G in the radial direction Dr is formed between the inner peripheral surface of the protrusion 32 and the rear end portion 92 over the entire circumferential direction Dθ. The gap G is formed, for example, in a range in which the push ring 9 can slide in the axial direction Dx between the convex portion 22 and the retaining ring 8.

One end 33a of the communication portion 33 has a tip portion 32a of the protruding portion 32 rather than the end surface 92a of the rear end portion 92 in a state where the insertion fitting 2 is inserted into the receiving fitting 1 and the convex portion 22 and the claw 5 are engaged with each other. Located on the side. In the example shown in FIG. 8, the end face 32d of the tip portion 32a and one end 33a coincide with each other. On the other hand, the other end 33b of the communication portion 33 has a protruding portion 32 from the end surface 92a of the rear end portion 92 in a state where the insertion bracket 2 is inserted into the receiving bracket 1 and the convex portion 22 and the claw 5 are disengaged. It is located on the base end portion 32b side of. Further, the width W of the communication portion 33 is secured to have a length required for the worker to work.

The coupling metal fitting C3 according to the second embodiment can effectively suppress the unintentional detachment of the receiving metal fitting 1 and the insertion metal fitting 2 as in the coupling metal fitting C1 according to the first embodiment. Unlike the protruding portion 41 according to the first embodiment, the protruding portion 32 of the receiving port F3 has a squeeze ring 30 made of a metal material, so that the end surface 32d of the tip portion 32a of the protruding portion 32 is caught by an obstacle or the like. In this case, even if a large force is applied to the tip portion 32a, the protruding portion 32 is not easily deformed.

The above embodiments are not limited to the configurations disclosed in each embodiment of the present invention. In addition, various structures depending on the application can be applied to the metal fittings.

For example, in the above embodiment, the coupling fitting in which the fire hose is connected to both the receiving port and the outlet is exemplified, but at least one of the receiving port and the outlet may be provided in a structure such as a fire hydrant or a fire fighting vehicle. .. Even if the socket does not have a protrusion like the socket F2, the protective member or the snap ring can be replaced with the protective member 4 or the snap ring 30 of the above embodiment to change to a socket having a protrusion. can.

C1, C2, C3 ... Coupling metal fittings, F1, F2, F3 ... Receptacle, M1 ... Insertion port, 1 ... Receiving metal fittings, 2 ... Insertion metal fittings, 3,30 ... Retaining ring, 31 ... Circular part, 32 ... Protruding part, 32a ... Tip, 33 ... Communication, 4, 40 ... Protective member, 41 ... Projection, 41a ... Tip, 42 ... Communication, 5 ... Claw, 6 ... Sealing material, 7 ... Claw seat, 8 ... Retaining ring , 9 ... Retaining ring, 91 ... Tip, 92 ... Rear end.

Claims (7)

By inserting the metal fitting provided in the insertion port into the metal fitting provided in the socket, the convex portion provided on the outer peripheral surface of the metal fitting and the convex portion provided on the metal fitting and urged toward the shaft of the metal fitting. The claw engages in an axial direction parallel to the axis, and a push ring provided so as to be slidable in the axial direction with respect to the outer peripheral surface is moved between the claw and the outer peripheral surface so as to be centered on the axis. A coupling fitting that disengages the convex portion from the claw by pushing up the claw in the radial direction.
The push ring has a tip portion for pushing up the claw and a rear end portion located on the opposite side of the tip portion in the axial direction.
The receiving port projects toward the insertion fitting side in the axial direction in a state where the insertion fitting is inserted into the receiving fitting and the convex portion and the claw are engaged with each other, and the rear end portion thereof is formed. Has a protrusion that covers from the outside,
Bonding bracket. A radial gap is formed between the protruding portion and the rear end portion in a state where the insert fitting is inserted into the receiving fitting and the convex portion and the claw are engaged with each other.
The coupling fitting according to claim 1. The socket further includes a claw ring that covers the claw from the outside, and a protective member attached to the outer peripheral surface of the claw ring.
The protective member has the protrusion.
The coupling fitting according to claim 1 or 2. The socket further comprises a claw ring that covers the claw from the outside.
The tightening ring has the protrusion.
The coupling fitting according to claim 1 or 2. The protrusion has a communication portion that communicates the outside and the inside of the protrusion in the radial direction.
The coupling fitting according to any one of claims 1 to 4. The communication portion is provided on the outer peripheral surface of the protrusion along the axial direction.
At one end of the communication portion in the axial direction, the tip of the protruding portion is more than the end surface of the rear end portion in a state where the insert fitting is inserted into the receiving metal fitting and the convex portion and the claw are engaged with each other. Located on the side of the department,
The other end of the communication portion in the axial direction is a protruding portion from the end surface of the rear end portion in a state where the insertion bracket is inserted into the receiving bracket and the convex portion and the claw are disengaged. Located on the base end side of
The coupling fitting according to claim 5. The end surface of the tip end portion of the protruding portion protrudes from the end surface of the rear end portion in a state where the insert fitting is inserted into the receiving metal fitting and the convex portion and the claw are engaged with each other.
The coupling fitting according to any one of claims 1 to 6.

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