JP7080956B1 - Bonding bracket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress unintentional detachment of a receiving metal fitting and a metal fitting. SOLUTION: The coupling metal fitting according to one embodiment includes a metal fitting and a receiving metal fitting, and by inserting the metal fitting into the metal fitting, a convex portion provided on an outer peripheral surface of the metal fitting and the receiving metal fitting are provided. The claws provided on the metal fittings and urged toward the shaft of the receiving metal fittings are engaged with each other, and the push ring provided slidably with respect to the outer peripheral surface is moved between the claws and the outer peripheral surface. By pushing up the claw, the engagement between the convex portion and the claw is released. The inner peripheral surface of the push ring includes a first portion having a first inner diameter and a second portion having a second inner diameter smaller than the first inner diameter. The first portion and the second portion are arranged in the circumferential direction about the axis of the push ring. [Selection diagram] Fig. 4

Description

The present invention relates to a plug-in type joint fitting in which both metal fittings are joined 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 firefighting activities, there is a risk that the push ring will be pushed when the fitting comes into contact with an obstacle at the site, and the fitting and receiving fitting will 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.

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.

The coupling metal fitting according to one embodiment includes a metal fitting and a metal fitting, and by inserting the metal fitting into the metal fitting, a convex portion provided on the outer peripheral surface of the metal fitting and the metal fitting are provided with the metal fitting. The claws urged toward the shaft of the receiving metal fitting are engaged with each other, and a push ring slidably provided with respect to the outer peripheral surface is moved between the claws and the outer peripheral surface to push up the claws. Disengages the convex portion from the claw. The inner peripheral surface of the push ring includes a first portion having a first inner diameter and a second portion having a second inner diameter smaller than the first inner diameter. The first portion and the second portion are arranged in the circumferential direction about the axis of the push ring. The push ring is rotatable in the circumferential direction with respect to the outer peripheral surface of the insert fitting.

The outlet may further include a retaining ring provided on the outer peripheral surface. In this case, the push ring may be located between the convex portion and the retaining ring in an axial direction parallel to the axis, and the second inner diameter may be smaller than the outer diameter of the retaining ring. Further, the first inner diameter may be larger than the outer diameter of the retaining ring.

The second portion may include a central portion having the second inner diameter, and first side portions and second side portions located on both sides of the central portion in the circumferential direction. In this case, the first side portion and the second side portion may have a shape in which the inner diameter becomes smaller toward the central portion.

The inner peripheral surface of the push ring may have a plurality of the second portions. For example, the inner peripheral surface of the push ring has a pair of the second portions, and the pair of the second portions face each other with the shaft interposed therebetween.

As another example, the inner peripheral surface of the push ring has three said second portions, and the three said second portions are provided at positions that do not face each other in a radial direction about the axis. ing.

The push ring has a tip on the side of the convex portion and a rear end located on the opposite side of the tip, and the second portion has the shaft as it goes from the rear end side toward the tip side. It may be tilted away from.

The inner peripheral surface of the push ring may further include a third portion having a third inner diameter smaller than the first inner diameter. In this case, the first portion and the third portion may be arranged in an axial direction parallel to the axis. The third portion may be formed in a ring shape continuous in the circumferential direction and may be connected to the second portion.

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 schematic side view of the fitting according to the first embodiment. FIG. 2 is a view of the socket shown in FIG. 1 as viewed along the axial direction from the closing ring side. FIG. 3 is a partial cross-sectional view of the joint fitting in a state where the receiving port and the insertion port are connected. FIG. 4 is a view of the push ring as viewed from the rear end side. FIG. 5 is a schematic cross-sectional view of the push ring along the VV line in FIG. FIG. 6 is a schematic cross-sectional view of the push ring along the VI-VI line in FIG. FIG. 7 is a schematic cross-sectional view of the outlet including the first portion. FIG. 8 is a schematic cross-sectional view of the outlet including the second portion. FIG. 9 is a view of the push ring according to the second embodiment as viewed from the rear end side. FIG. 10 is a view of the push ring according to the third embodiment as viewed from the rear end side. FIG. 11 is a schematic cross-sectional view of the push ring according to the fourth embodiment. FIG. 12 is a schematic cross-sectional view of the push ring along line XII-XII in FIG.

Some embodiments will be described with reference to the drawings.
In each embodiment, a plug-in type fitting that is expected to be used mainly in the field of fire fighting will be illustrated. However, the metal fitting can be used for various purposes other than the field of fire fighting, such as connecting flow paths for industrial and agricultural purposes.

[First Embodiment]
FIG. 1 is a schematic side view of the coupling fitting C according to the first embodiment. The coupling metal fitting C includes a receiving port F and an insertion port M. The receiving port F includes a cylindrical receiving metal fitting 1 (female metal fitting) centered on the shaft AX1. The insertion port M 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. Further, 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.

The receiving metal fitting 1 has a first end portion 1a and a second end portion 1b in the axial direction Dx. Further, 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 in. 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 receiving port F further includes an annular squeeze ring 3 connected to the enlarged diameter portion 12 and an annular band 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 band 4 is made of rubber, for example, and its outer peripheral surface protrudes most in the radial direction Dr at the receiving port F and the insertion port M.

The metal fitting 2 has a first end portion 2a and a second end portion 2b in the axial direction Dx. Further, the insert 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 bracket 1 side on the first end portion 2a side, and is located in the radial direction Dr from the surroundings. A slightly protruding annular convex portion 22 is provided on the second end portion 2b 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 M includes an annular retaining ring 5 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 6 located on the convex portion 22 side of the retaining ring 5. Further prepared. The retaining ring 5 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 6 has a tip 6a and a rear end 6b on the opposite side in the axial direction Dx. Further, the push ring 6 has a cylindrical portion 61 including a tip 6a and a flange portion 62 including a rear end 6b. The cylindrical portion 61 has a cylindrical shape that surrounds the outer peripheral surface 2c. The flange portion 62 projects from the cylindrical portion 61 in the radial direction Dr. The tip 6a faces the side surface of the convex portion 22 in the axial direction Dx. The push ring 6 is prevented from coming off from the metal fitting 2 by the convex portion 22 and the retaining ring 5.

FIG. 2 is a view of the socket F as viewed from the side of the ring 3. As shown in FIG. 2, the circumferential direction Dθ centered on the axes AX1 and AX2 is defined. As shown in FIG. 2, three claws 7A, 7B, and 7C are arranged inside the receiving metal fitting 1.

The claws 7A, 7B, and 7C have an arc shape along the circumferential direction Dθ, and are arranged in the circumferential direction Dθ at equal intervals. The number of claws provided in the socket F is not limited to three, and may be two or four or more.

FIG. 3 is a partial cross-sectional view of the coupling fitting C in a state where the receiving port F and the insertion port M are connected. The push ring 6 is not fixed to the outer peripheral surface 2c of the metal fitting 2. The push ring 6 is rotatable in the circumferential direction Dθ with respect to the outer peripheral surface 2c in both the state where the insertion port M and the receiving port F are not connected and the state where the insertion port M and the receiving port F are connected, and is convex. It is slidable in the axial direction Dx between the portion 22 and the retaining ring 5.

As shown in FIG. 3, the second end portion 1b of the receiving metal fitting 1 projects toward the axis AX1 in the entire circumferential direction Dθ. The tightening ring 3 has a second end portion 1b and an end portion 3a facing the axial direction Dx. The end portion 3a projects toward the axis AX1 in the entire circumferential direction Dθ.

The receiving port F further includes a sealing material 8 arranged inside the enlarged diameter portion 12 and a claw seat 9 for holding the claws 7A, 7B, 7C. The sealing material 8 is, for example, an annular rubber packing. The claw seat 9 is fixed to the receiving metal fitting 1 by the tightening ring 3, and is arranged between the second end portion 1b and the end portion 3a.

The claw 7A can move in parallel with the radial direction Dr between the claw seat 9 and the second end portion 1b. The claw 7A is urged toward the shaft AX1 by, for example, an elastic member 70 which is a leaf spring. The claws 7B and 7C can also move in parallel with the radial direction Dr between the claw seat 9 and the second end 1b like the claw 7A, and are urged toward the shaft AX1 by the elastic member 70.

When connecting the receiving port F and the insertion port M, 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 claws 7A, 7B, 7C in the radial direction against the urging force of the elastic member 70. As a result, as shown in FIG. 3, 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 8 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 claws 7A, 7B, 7C come into contact with the outer peripheral surface 2c of the metal fitting 2 by the urging force of the elastic member 70. In this state, a part of each of the claws 7A, 7B, and 7C faces the convex portion 22 and the axial direction Dx. That is, since the convex portion 22 and the claws 7A, 7B, 7C engage with the axial Dx, the receiving metal fitting 1 and the inserting metal fitting 2 cannot be separated.

When the receiving metal fitting 1 and the inserting metal fitting 2 are separated, the flange portion 62 is pushed and the push ring 6 is slid toward the convex portion 22. As a result, the tip 6a of the push ring 6 pushes up the claws 7A, 7B, 7C, and the engagement between the convex portion 22 and the claws 7A, 7B, 7C is released. In the state where the protrusion 22 and the claws 7A, 7B, 7C are disengaged, the insert fitting 2 can be removed from the fitting 1.

FIG. 4 is a view of the push ring 6 as viewed from the rear end 6b side. FIG. 5 is a schematic cross-sectional view of the push ring 6 along the VV line in FIG. FIG. 6 is a schematic cross-sectional view of the push ring 6 along the VI-VI line in FIG.

As shown in FIGS. 4 to 6, the axis of the push ring 6 is defined as AX6. Further, as shown in FIG. 4, the radial direction Dr6 and the circumferential direction Dθ6 about the axis AX6 are defined. Further, as shown in FIGS. 5 and 6, an axial Dx6 parallel to the axis AX6 is defined. In the state where the axis AX6 coincides with the axes AX1 and AX2, the radial direction Dr6 and the radial direction Dr coincide with each other, the circumferential direction Dθ6 and the circumferential direction Dθ coincide with each other, and the axial direction Dx6 and the axial direction Dx coincide with each other.

The push ring 6 has an inner peripheral surface 63. As shown in FIG. 4, the inner peripheral surface 63 includes a pair of first portions 64 (64A, 64B) and a pair of second portions 65 (65A, 65B). The first portions 64A and 64B face each other with the shaft AX6 interposed therebetween. The second portions 65A and 65B face each other with the shaft AX6 interposed therebetween.

Both the first portions 64A and 64B have a first length L1 in the circumferential direction Dθ6. The second portions 65A and 65B both have a second length L2 in the circumferential direction Dθ6. The first length L1 is sufficiently larger than the second length L2 (L1> L2). For example, the first length L1 is 10 times or more the second length L2.

The length of the first portion 64A in the circumferential direction Dθ6 may be different from the length of the first portion 64B in the circumferential direction Dθ6. Similarly, the length of the second portion 65A in the circumferential direction Dθ6 and the length of the second portion 65B in the circumferential direction Dθ6 may be different.

The first portions 64A and 64B are curved surfaces centered on the axis AX6. The second portions 65A and 65B have a shape protruding toward the shaft AX6. That is, the second portions 65A and 65B can also be said to be convex portions.

Specifically, the second portion 65A includes a central portion 65a and a first side portion 65b and a second side portion 65c located on both sides of the central portion 65a in the circumferential direction Dθ6, respectively. The central portion 65a is the most protruding portion of the second portion 65A toward the axis AX6. The second portion 65B has the same shape as the second portion 65A. The central portion 65a of the second portion 65A and the central portion 65a of the second portion 65B face each other with the shaft AX6 interposed therebetween. That is, these central portions 65a are located at positions displaced by 180 degrees in the circumferential direction Dθ6.

The first portions 64A and 64B have a first inner diameter R1. The first inner diameter R1 corresponds to the length of a straight line from the first portion 64A to the first portion 64B through the shaft AX6.

The second portions 65A and 65B have a second inner diameter R2. The second inner diameter R2 corresponds to the distance between the central portions 65a of the second portions 65A and 65B.

The second inner diameter R2 is smaller than the first inner diameter R1 (R1> R2). The difference between the first inner diameter R1 and the second inner diameter R2 is, for example, 1 mm or more, preferably 2 mm or more. In one example, when the coupling fitting C has the same configuration as the general 65A Machino fitting, the first inner diameter R1 is 66.4 to 66.6 mm, and the second inner diameter R2 is 64 mm.

The first side portion 65b and the second side portion 65c have a shape in which the inner diameter becomes smaller toward the central portion 65a. That is, the inner diameters of the first side portion 65b and the second side portion 65c change within the range of the second inner diameter R2 or more and the first inner diameter R1 or less.

In the example of FIG. 4, the first side portion 65b is a curved surface having a radius of curvature rb, and the second side portion 65c is a curved surface having a radius of curvature rc. The center of curvature Ob of the first side portion 65b is located in a region to the left of the line segment connecting the central portion 65a and the axis AX6 (the region on the same side as the first side portion 65b with respect to the line segment). The center of curvature Occ of the second side portion 65c is located in a region to the right of the line segment connecting the center portion 65a and the axis AX6 (the region on the same side as the second side portion 65c with respect to the line segment). The shapes of the first side portion 65b and the second side portion 65c of the second portion 65B are also the same as those of the second portion 65A.

The shape of the inner peripheral surface 63 of the push ring 6 is the same as that shown in FIG. 4 over the entire axial direction Dx6. That is, as shown in FIG. 5, in the cross section including the first portions 64A and 64B, the inner peripheral surface 63 has a linear shape parallel to the axial direction Dx6. Similarly, as shown in FIG. 6, in the cross section including the second portions 65A and 65B, the inner peripheral surface 63 has a linear shape parallel to the axial direction Dx6.

However, the inner peripheral surface 63 of the push ring 6 does not necessarily have to be uniform in the axial direction Dx6. For example, in the cross section of FIG. 6, the second portions 65A and 65B may be provided on the rear end 6b side, and a portion having an inner diameter larger than the second inner diameter R2 may be provided on the tip 6a side of the second portions 65A and 65B. ..

As shown in FIG. 5, in the cross section including the first portions 64A and 64B, the cylindrical portion 61 has a first thickness t1. As shown in FIG. 6, in the cross section including the second portions 65A and 65B, the cylindrical portion 61 has a second thickness t2. The first thickness t1 is smaller than the second thickness t2 (t1 <t2). The outer diameter of the cylindrical portion 61 is the same at any position in the circumferential direction Dθ6.

FIG. 7 is a schematic cross-sectional view of the insertion port M including the first portions 64A and 64B. FIG. 8 is a schematic cross-sectional view of the insertion port M including the second portions 65A and 65B. As shown in these figures, the push ring 6 is located between the convex portion 22 and the retaining ring 5 in the axial direction Dx6.

The retaining ring 5 has an outer diameter R5. As shown in FIG. 7, the first inner diameter R1 is larger than the outer diameter R5 (R1> R5). On the other hand, as shown in FIG. 8, the second inner diameter R2 is smaller than the outer diameter R5 (R2 <R5).

In FIGS. 7 and 8, the push ring 6 in which the axial direction Dx6 is parallel to the axial direction Dx of the metal fitting 2 is shown by a solid line, and the axial direction Dx6 is tilted to the maximum with respect to the axial direction Dx. The push ring 6 is indicated by a chain line.

In FIG. 7, for example, when a force P is applied to the lower part of the flange portion 62 (the portion on the first portion 64B side), a moment acts on the push ring 6 and the push ring 6 is tilted as shown by a chain line. At this time, the portion of the tip 6a on the first portion 64B side and the portion of the rear end 6b on the first portion 64A side come into contact with the outer peripheral surface 2c. When a force P is applied to the upper portion of the flange portion 62 in the drawing, the tilting direction of the push ring 6 is reversed.

Similarly, in FIG. 8, for example, when a force P is applied to the lower part of the flange portion 62 in the figure (the portion on the second portion 65B side), a moment acts on the push ring 6 and the push ring 6 is tilted as shown by the chain line. .. At this time, the portion of the tip 6a on the second portion 65B side and the portion of the rear end 6b on the second portion 65A side come into contact with the outer peripheral surface 2c. When a force P is applied to the upper portion of the flange portion 62 in the drawing, the tilting direction of the push ring 6 is reversed.

As described above, the first inner diameter R1 is larger than the second inner diameter R2. Therefore, the gap between the inner peripheral surface 63 and the outer peripheral surface 2c in the cross section including the first portions 64A and 64B is larger than the gap in the cross section including the second portions 65A and 65B. Due to this large gap, the push ring 6 is tilted more with respect to the axial Dx when the force P is applied as shown in FIG. 7 than when the force P is applied as shown in FIG. It becomes possible.

In the conventional plug-in type coupling fitting, the inner diameter of the push ring has a uniform shape over the entire circumferential direction. Further, the gap between the inner peripheral surface of the push ring and the outer peripheral surface of the metal fitting is extremely small, and is generally about the same as the gap between the second portions 65A and 65B and the outer peripheral surface 2c in the present embodiment. In a fire extinguishing activity using a fire hose coupled with such a fitting, if the flange portion hits an obstacle, the push ring may be unintentionally pushed and the fitting and the receiving fitting may be separated. Such withdrawal can lead to a significant delay in fire extinguishing activities.

On the other hand, in the present embodiment, the inner peripheral surface 63 has the first portions 64A and 64B having a large inner diameter. Therefore, even when the portion of the flange portion 62 near the first portions 64A and 64B is pushed by an obstacle or the like, the push ring 6 is greatly tilted as shown in FIG. 7, and the push ring 6 is clawed 7A. The force to slide toward 7B and 7C is difficult to work. As a result, it is possible to prevent the receiving metal fitting 1 and the metal fitting 2 from being unintentionally detached.

In such a state where the push ring 6 is tilted, the inner diameter of the end portion 3a or the claw seat 9 may be defined so that the tip 6a hits the end portion 3a or the claw seat 9 of the tightening ring 3 and cannot be pushed further. In this case, it is possible to more reliably suppress the unintentional detachment of the receiving metal fitting 1 and the inserting metal fitting 2.

If the inner diameter of the inner peripheral surface 63 is increased as a whole, the retaining ring 5 does not work to prevent the inner peripheral surface from coming off. Therefore, when increasing the inner diameter of the inner peripheral surface 63 as a whole, it is necessary to determine the inner diameter within a range not exceeding the outer diameter R5 of the retaining ring 5.

In this regard, in the present embodiment, the inner peripheral surface 63 has the second portions 65A and 65B having an inner diameter smaller than that of the first portions 64A and 64B. If the second portions 65A and 65B play a role of preventing slipping out, the first inner diameter R1 of the first portions 64A and 64B can be made larger than the outer diameter R5, and the push ring 6 can be tilted at a larger angle. Become.

When the receiving metal fitting 1 and the inserting metal fitting 2 are intentionally separated, for example, if the flange portion 62 of the push ring 6 is pressed at two locations 180 degrees apart at the same time, the push ring 6 can be pushed in without tilting. Can be done. Therefore, even when the structure according to the present embodiment is applied, no particular effort is required for the detachment work.

The above embodiments do not limit the scope of the present invention to the configurations disclosed in the embodiments. In addition, various structures depending on the application can be applied to the metal fittings.
The following discloses other embodiments that may be applicable to the push wheel. As for the configurations not particularly mentioned in these embodiments, the same ones as those in the first embodiment may be applied.

[Second Embodiment]
FIG. 9 is a view of the push ring 6 according to the second embodiment as viewed from the rear end 6b side. In the example of this figure, the push ring 6 has one first portion 64 and one second portion 65. In the present embodiment, the first inner diameter R1 corresponds to the length of a straight line connecting two points on the first portion 64 and passing through the axis AX6. Further, the second inner diameter R2 corresponds to the length of a straight line from the central portion 65a of the second portion 65 to the first portion 64 through the shaft AX6.

[Third Embodiment]
FIG. 10 is a view of the push ring 6 according to the third embodiment as viewed from the rear end 6b side. In the example of this figure, the inner peripheral surface 63 of the push ring 6 has three first portions 64 (64A, 64B, 64C) and three second portions 65 (65A, 65B, 65C). ..

The second portions 65A, 65B, and 65C are positioned by 120 degrees in the circumferential direction Dθ6. That is, the second portions 65A, 65B, and 65C are provided at positions that do not face each other in the radial direction Dr6.

In the circumferential direction Dθ6, the first portion 64A is located between the second portions 65A and 65B, the first portion 64B is located between the second portions 65B and 65C, and the first portion 64C is located between the second portions 65A and 65C. It is located between. The length of the first portion 64A, 64B, 64C in the circumferential direction Dθ6 is sufficiently larger than the length of the second portion 65A, 65B, 65C in the circumferential direction Dθ6.

In the present embodiment, the first inner diameter R1 corresponds to the length of a straight line connecting two points on the first portions 64A, 64B, 64C and passing through the axis AX6. Further, the second inner diameter R2 corresponds to the length of a straight line connecting the central portion 65a and one point on the first portions 64A, 64B, 64C and passing through the axis AX6.

Even in the configurations of the second and third embodiments, for example, the first inner diameter R1 is made larger than the outer diameter R5 of the retaining ring 5, and the second inner diameter R2 is made smaller than the outer diameter R5. The same effect as that of the embodiment can be obtained.

When the second portions 65A and 65B face each other in the radial direction as in the first embodiment, as shown in FIG. 8, the push ring 6 is formed in the plane including the second portions 65A and 65B and the shaft AX6. The tiltable range of is small. On the other hand, in the second embodiment and the third embodiment, since the second portion 65 (65A, 65B, 65C) does not face each other in the radial direction Dr6, any one of the second portions 65 (65A, 65B, 65C) and the axis AX6 The tiltable range of the push ring 6 becomes large even in the plane including. Therefore, it is possible to more effectively suppress the unintentional detachment of the receiving metal fitting 1 and the metal fitting 2.

The number of the second portion 65 is not limited to one, two or three, and may be four or more. If an odd number of second portions 65 are provided and arranged so as not to face each other in the radial direction Dr6, the effect of widening the tiltable range of the push ring 6 in the plane including any of the second portions 65 and the axis AX6 can be obtained. ..

[Fourth Embodiment]
FIG. 11 is a schematic cross-sectional view of the push ring 6 (cylindrical portion 61) according to the fourth embodiment. In the present embodiment, as in the third embodiment, the inner peripheral surface 63 of the push ring 6 has three first portions 64 (64A, 64B, 64C) and three second portions 65 (65A, 65B, 65C). is doing.

In the example of FIG. 11, the second portions 65A, 65B, 65C have a flat tip surface 65d. The second inner diameter R2 in the present embodiment corresponds to, for example, the length of a straight line connecting the central portion of the tip surface 65d and one point on the first portions 64A, 64B, 64C and passing through the axis AX6.

The tip surface 65d may be a curved surface. In this case, the tip surface 65d may have a curvature about the axis AX6. Further, the second portion 65A, 65B, 65C may have the same shape as the second portion 65 in each of the above-described embodiments. Further, the same shape of the second portion 65 as in FIG. 11 can be applied to the second portion 65 in each of the above-described embodiments.

FIG. 12 is a schematic cross-sectional view of the push ring 6 along line XII-XII in FIG. The inner peripheral surface 63 of the push ring 6 further includes a third portion 66. The third portion 66 has a third inner diameter R3 that is smaller than the first inner diameter R1.

In the example of FIG. 12, the third portion 66 is located on the rear end 6b side and is formed in a continuous annular shape in the circumferential direction Dθ6. The third portion 66 is connected to the second portions 65A, 65B, 65C. The first portion 64A, 64B, 64C and the third portion 66 are arranged in the axial direction Dx6.

For example, the width W of the third portion 66 in the axial direction Dx6 is equal to or less than the width of the flange portion 62 in the axial direction Dx6. As an example, the width W is 2 mm or less.

In the example of FIG. 12, the second portion 65A is inclined so as to be separated from the shaft AX6 from the rear end 6b side toward the tip 6a side. The same applies to the second parts 65B and 65C. That is, the second inner diameter R2 changes depending on the position in the axial direction Dx6. However, at any position, the second inner diameter R2 is equal to or less than the first inner diameter R1. As an example, the second inner diameter R2 is equal to the third inner diameter R3 on the rear end 6b side and equal to the first inner diameter R1 on the tip 6a side.

Even with the configuration of the present embodiment, for example, by making the third inner diameter R3 smaller than the outer diameter R5 of the retaining ring 5, the same effect as that of each of the above-described embodiments can be obtained. Further, if the second portions 65A, 65B, and 65C are inclined as shown in FIG. 12, the inner diameter on the tip 6a side becomes large as a whole, and the push ring 6 tends to be inclined. As a result, it is possible to more effectively suppress the unintentional detachment of the receiving metal fitting 1 and the metal fitting 2. The second portion 65 in the first to third embodiments may be inclined in the same manner as in the present embodiment.

In the above embodiment, if the shape of the second portion 65 (65A, 65B, 65C) has an inner diameter smaller than that of the first portion 64 (64A, 64B, 64C), it is shown in FIGS. 4, 9 to 11. Not limited to things.

In each of the above embodiments, the coupling fitting C in which the fire hose is connected to both the receiving port F and the insertion port M is exemplified, but at least one of the receiving port F and the insertion port M is provided in a structure such as a fire hydrant or a fire fighting vehicle. May be done.

C ... Bonding metal fittings, F ... Receiving port, M ... Insertion port, 1 ... Receiving metal fittings, 2 ... Inserting metal fittings, 3 ... Claw wheels, 4 ... Bands, 5 ... Retaining rings, 6 ... Pushing rings, 7A, 7B, 7C ... Claws , 8 ... Sealing material, 9 ... Claw seat, 22 ... Convex part, 64 (64A, 64B, 64C) ... 1st part, 65 (65A, 65B, 65C) ... 2nd part.

Claims (11)

By inserting the metal fitting into the metal fitting, the convex portion provided on the outer peripheral surface of the metal fitting and the claw provided on the metal fitting and urged toward the shaft of the metal fitting are engaged with each other. A coupling fitting that disengages the convex portion from the claw by moving a push ring slidably provided with respect to the outer peripheral surface between the claw and the outer peripheral surface and pushing up the claw. ,
The inner peripheral surface of the push ring includes a first portion having a first inner diameter and a second portion having a second inner diameter smaller than the first inner diameter.
The first portion and the second portion are arranged in the circumferential direction about the axis of the push ring.
The push ring is rotatable in the circumferential direction with respect to the outer peripheral surface of the insert fitting.
Bonding bracket. A retaining ring provided on the outer peripheral surface of the insert fitting is provided.
The push ring is located between the convex portion and the retaining ring in an axial direction parallel to the axis.
The second inner diameter is smaller than the outer diameter of the retaining ring.
The coupling fitting according to claim 1. The first inner diameter is larger than the outer diameter of the retaining ring.
The coupling fitting according to claim 2. The second portion includes a central portion having the second inner diameter, and first side portions and second side portions located on both sides of the central portion in the circumferential direction.
The first side portion and the second side portion have a shape in which the inner diameter becomes smaller toward the central portion.
The coupling fitting according to any one of claims 1 to 3. The inner peripheral surface of the push ring has a plurality of the second portions.
The coupling fitting according to any one of claims 1 to 4. The inner peripheral surface of the push ring has a pair of the second portions.
The pair of the second portions face each other with the axis interposed therebetween.
The coupling fitting according to claim 5. The inner peripheral surface of the push ring has three said second portions.
The three second portions are provided at positions that do not face each other in the radial direction about the axis.
The coupling fitting according to claim 5. The push ring has a tip on the side of the convex portion and a rear end located on the opposite side of the tip.
The second portion is inclined away from the axis from the rear end side toward the front end side.
The coupling fitting according to any one of claims 1 to 7. The inner peripheral surface of the push ring further includes a third portion having a third inner diameter smaller than the first inner diameter.
The first portion and the third portion are aligned in an axial direction parallel to the axis.
The coupling fitting according to any one of claims 1 to 8. The third portion is formed in a ring shape continuous in the circumferential direction and is connected to the second portion.
The coupling fitting according to claim 9. The gap between the inner peripheral surface and the outer peripheral surface in the cross section including the first portion of the insert fitting and the push ring is the inner peripheral surface and the said in the cross section including the second portion of the insert fitting and the push ring. Larger than the gap on the outer peripheral surface,
The coupling fitting according to any one of claims 1 to 10.

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