Fire-fighting fittings

Abstract

To provide a plug-type fire connecting fitting which is capable of reliably preventing a pressing ring from being unintentionally pushed to a position where an inserting fitting and a fastening claw are disengageable in the state that a female fixture and a male fitting are connected.SOLUTION: In a plug-type fire connecting fitting 1, a contact prevention member 4 arranged on an outer peripheral side of a male fitting 3 is provided with a cylinder part 4a where a pressing ring 18 is arranged on an inner peripheral side, and a cover part 4b connected to the inner peripheral side of a left end of the cylinder part 4a. The cover part 4b is arranged on the left side of a flange part 18b of pressing ring 18. In the fire connecting fitting 1, a cover end 4c to be a right end of the cover part 4b is arranged on the left side of a left face of a flange part 18b in the state that the pressing ring 18 is arranged at a releasable position 18A to be a position of the pressing ring 18 when a fastening claw 8 and an inserting fitting 17 become disengageable and a right end face 4d of a cylinder part 4a contacts a left end face 6c of a tightening ring 6.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a plug-in type fire coupling for connecting fire hoses to each other or for connecting a fire hose to a fire hydrant valve. [Background technology]

[0002] Conventionally, a plug-in type fire coupling is known that includes a female fitting connected to the end of a fire hose and a male fitting connected to the end of the fire hose and into which the female fitting is removably inserted (see, for example, Patent Document 1). In the fire coupling described in Patent Document 1, the female fitting includes a receiving fitting attached to the fire hose, a fastening ring fixed to the tip side of the receiving fitting, a claw seat disposed on the inner periphery of the fastening ring, a coupling claw protruding radially inward from the inner periphery of the claw seat, and a leaf spring that biases the coupling claw toward the radially inward direction of the claw seat. The male fitting includes a plug attached to the fire hose and a push ring slidably attached to the plug. The push ring is formed in a cylindrical shape with a brim.

[0003] In the fire-fighting fastener described in Patent Document 1, the female fitting and the male fitting are connected by the engagement of the tip of the insert fitting and the connecting claw. In addition, in this fire-fighting fastener, the engagement between the tip of the insert fitting and the connecting claw is released by pushing the push ring into the female fitting and moving the connecting claw radially outward of the claw seat with the tip of the push ring, and the connected state between the female fitting and the male fitting is released. Therefore, when a fire-fighting fastener in which the female fitting and the male fitting are connected is used for firefighting activities, for example, if an obstacle comes into contact with the flange of the push ring and the push ring is pushed into the female fitting to a position where the engagement between the insert fitting and the connecting claw can be released, the female fitting may come off the male fitting, causing an unexpected accident.

[0004] Therefore, in the fire-fighting coupling fitting described in Patent Document 1, a short pipe is fixed to the male fitting to prevent the push ring from being accidentally pushed in to a position where the engagement between the insert fitting and the coupling claw can be released when the female fitting and the male fitting are coupled. The short pipe is fixed to the male fitting at a position farther away from the female fitting than the push ring. The short pipe is also fixed to the male fitting using a tightening device, and is fixed to the male fitting by applying equal tightening to the short pipe from four directions. An inclined edge is formed on the end of the short pipe that is located on the push ring side. The inclined edge is formed at four points in the circumferential direction of the short pipe.

[0005] In the firefighting fitting described in Patent Document 1, the inclined edge of the short pipe covers a part of the flange of the push ring. Therefore, although obstacles come into contact with the inclined edge, the inclined edge prevents the obstacles from coming into contact with the flange of the push ring, and the inclined edge serves the function of preventing the obstacles from coming into contact with the flange of the push ring. In addition, by preventing obstacles from coming into contact with the flange of the push ring, the inclined edge prevents the push ring from being accidentally pushed into a position where the engagement between the insert and the connecting claw can be released when the female fitting and the male fitting are connected. In addition, in this firefighting fitting, the female fitting and the male fitting can be separated by inserting a finger into the gap formed between the inclined edges in the circumferential direction of the short pipe and pushing the push ring. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-287377 Summary of the Invention [Problem to be solved by the invention]

[0007] In the fire-fighting joint described in Patent Document 1, the short pipe is fixed to the male fitting by applying uniform tightening to the short pipe from four directions, and there is a risk that the fixing strength of the short pipe to the male fitting may decrease due to some cause. If the fixing strength of the short pipe to the male fitting decreases, when an obstacle or the like comes into contact with the inclined edge portion while the female fitting and the male fitting are connected, the short pipe may move toward the push ring relative to the male fitting, and the inclined edge portion may come into contact with the flange of the push ring. Also, if the short pipe moves toward the push ring relative to the male fitting and the inclined edge portion comes into contact with the flange of the push ring, the push ring may be suddenly pushed into a position where the engagement between the insert fitting and the connecting claw can be released, and the female fitting may come off the male fitting.

[0008] Therefore, the object of the present invention is to provide a plug-in type fire-fighting connecting fitting that can reliably prevent the push ring from being accidentally pushed into a position where the engagement between the plug fitting and the connecting claw can be released when the female fitting and male fitting are connected. [Means for solving the problem]

[0009] In order to solve the above problems, the fire fitting of the present invention is a plug-in type fire fitting comprising a female fitting and a male fitting, and is provided with a contact prevention member arranged on the outer periphery of the male fitting, the female fitting comprising a receiving fitting, a clamp having a cylindrical clamping ring tubular portion attached to the receiving fitting, a claw seat attached to the inner periphery of the clamping ring tubular portion, connecting claws protruding radially inward from the inner periphery of the claw seat to engage with the male fitting, and a biasing member for biasing the connecting claw radially inward of the claw seat, and the male fitting comprises The connector is provided with a plug having a tip that engages with the connecting claw, and a push ring that is slidably attached to the outer periphery of the plug. When the female and male fittings are connected, one axial side of the fire-fighting fitting is defined as the first direction side, and the opposite side to the first direction side is defined as the second direction side. The female fitting is connected to the male fitting from the second direction side, and the clamping ring end face, which is the end face on the first direction side of the clamping ring, constitutes the end face on the first direction side of the female fitting and is an annular flat surface that is perpendicular to the axial direction of the fire-fighting fitting. The push ring is oriented in the axial direction of the fire-fighting fitting. The contact prevention member has a cylindrical press ring tube portion formed in a cylindrical shape facing the first direction, and an annular, flat flange portion extending radially outward from the end of the press ring tube portion on the first direction side of the press ring tube portion, and the end of the press ring tube portion on the second direction side is inserted into the inner peripheral side of the pawl seat when the engaging state between the connecting pawl and the insert metal is released, thereby moving the connecting pawl to the radially outward side of the pawl seat, and the contact prevention member has a cylindrical press ring disposed on its inner peripheral side, and a cover portion connected to the inner peripheral side of the end of the tube portion on the first direction side, and when the female metal fitting and the male metal fitting are separated, The cover portion is arranged on the first direction side of the flange portion, and the end face of the tube portion, which is the end face on the second direction side of the tube portion, is capable of contacting the end face of the fastening ring, and when the position of the push ring is in the releasable position when the engagement between the connecting claw and the insert can be released, when the end face of the tube portion is in contact with the end face of the fastening ring and the push ring is arranged in the releasable position, the cover end, which is the end portion on the second direction side of the cover portion, is arranged on the first direction side of the face on the first direction side of the flange portion.

[0010] In the fire-fighting coupling of the present invention, the contact-preventing member arranged on the outer periphery of the male fitting includes a cylindrical tube portion with the push ring arranged on its inner periphery and a cover portion connected to the inner periphery of the end portion of the tube portion on the first direction side, and the cover portion is arranged on the first direction side of the flange portion of the push ring. Therefore, in the present invention, the contact-preventing member makes it possible to prevent obstacles, etc., from directly contacting the flange portion of the push ring from the first direction side.

[0011] Furthermore, in the present invention, the tube end face, which is the end face on the second direction side of the tube part of the contact prevention member, is capable of contacting the tightening ring end face of the tightening ring that constitutes the end face on the first direction side of the female metal fitting, and the contact prevention member will not move further toward the female metal fitting from a state in which the tube end face is in contact with the tightening ring end face. Furthermore, when the press ring is located in the releasable position, which is the position of the press ring when the engagement between the coupling claw and the plug can be released, and the tube end face is in contact with the tightening ring end face, the cover end, which is the end of the second direction side of the cover part, is located on the first direction side of the first direction side face of the flange part, so that even if an obstacle or the like comes into contact with the contact prevention member from the first direction side and pushes the contact prevention member toward the second direction side when the female metal fitting and the male metal fitting are coupled, the press ring will not be pushed to the releasable position by the contact prevention member.

[0012] Therefore, in the present invention, when the female fitting and the male fitting are coupled, it is possible to use the contact prevention member to reliably prevent the push ring from being pushed into a releasable position by an obstacle or the like. In other words, in the present invention, it is possible to reliably prevent the push ring from being accidentally pushed into a position where the engagement between the insert fitting and the coupling claw can be released when the female fitting and the male fitting are coupled. Also, in the present invention, when the female fitting and the male fitting are separated, the contact prevention member is slidable relative to the insert fitting, and is not fixed to the insert fitting. Therefore, in the present invention, the installation work of the contact prevention member can be easily performed.

[0013] In the present invention, if the position of the press ring when the second direction side end of the press ring tube part contacts the connecting claw is defined as the contact start position, it is preferable that when the end face of the tube part contacts the end face of the fastening ring and the press ring is located at the contact start position, the cover end part is located on the first direction side of the first direction side face of the flange part, or is in contact with the first direction side face of the flange part. With this configuration, even if an obstacle or the like contacts the contact prevention member from the first direction side and pushes the contact prevention member to the second direction side when the female metal fitting and the male metal fitting are connected, the press ring will not be pushed to the second direction side by the contact prevention member from the contact start position. Therefore, it is possible to more reliably prevent the press ring from being accidentally pushed to a position where the engagement between the insert fitting and the connecting claw can be released when the female metal fitting and the male metal fitting are connected.

[0014] In the present invention, it is preferable that the cover portion is formed in a ring-like and flat shape that connects to the inner periphery of the end portion on the first direction side of the tubular portion. With this configuration, the ring-shaped cover portion makes it easier to prevent obstacles from directly contacting the flange portion of the press ring from the first direction side. Therefore, it is possible to more reliably prevent the press ring from being accidentally pushed into a position where the engagement between the insert metal fitting and the coupling claw can be released when the female metal fitting and the male metal fitting are coupled.

[0015] In the present invention, for example, the contact prevention member is formed with a notch portion for pushing the flange portion toward the second direction, and the notch portion is formed in at least two locations in the circumferential direction of the tubular portion and is formed from the cover portion to the tubular portion.

[0016] In the present invention, it is preferable that the male fitting has a retaining ring for preventing the push ring from coming off the insert fitting in the first direction, the cover is disposed on the second direction side of the retaining ring, and the retaining ring prevents the contact prevention member from coming off the insert fitting in the first direction. With this configuration, it is possible to prevent the contact prevention member from coming off the insert fitting even when the female fitting and the male fitting are separated. Therefore, the contact prevention member is easy to handle.

[0017] In the present invention, an annular gap for pressing the flange portion in the second direction may be formed between the inner circumferential surface of the cover portion and the outer circumferential surface of the insert metal member.

[0018] In the present invention, it is preferable that the contact-preventing member is composed of a plurality of divided bodies that are divided in the circumferential direction of the cylindrical portion, and is formed by fixing the plurality of divided bodies together. With this configuration, it becomes possible to later attach the contact-preventing member to the outer periphery of a male fitting that is already in use or a male fitting that is available on the market. In other words, it becomes possible to later attach the contact-preventing member to the outer periphery of the male fitting. Effect of the Invention

[0019] As described above, with the plug-in type fire-fighting connecting fitting of the present invention, it is possible to reliably prevent the push ring from being accidentally pushed into a position where the engagement between the plug fitting and the connecting claw can be released when the female fitting and male fitting are connected. [Brief description of the drawings]

[0020] [Figure 1] 1 is a front view of a fire-fighting fitting according to an embodiment of the present invention, showing a state in which the female fitting and the male fitting are separated. FIG. [Diagram 2] 2 is a vertical cross-sectional view of the fire-fighting fitting shown in FIG. 1 in a state in which the female fitting and the male fitting are joined together. [Diagram 3] 2 is a view showing the female metal fitting from the EE direction of FIG. 1 with the receiving metal fitting and the rubber tire removed. FIG. [Figure 4] 2 is a view showing a male fitting and a contact-preventing member as viewed from the FF direction in FIG. 1. [Diagram 5] FIG. 2 is a front view of the push ring shown in FIG. [Figure 6] 1, (B) is a front view of the contact-preventing member shown in FIG. 1, and (C) is a right side view of the contact-preventing member shown in FIG. [Figure 7]3 is a vertical cross-sectional view showing the fire fitting shown in FIG. 2 in a state different from that in FIG. 2. [Figure 8] 13A and 13B are diagrams illustrating a configuration of a contact-preventing member according to another embodiment of the present invention. [Figure 9] 13A and 13B are diagrams illustrating a configuration of a contact-preventing member according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0022] (Configuration of fire-fighting fittings) FIG. 1 is a front view of a fire-fighting fitting 1 according to an embodiment of the present invention, in a state in which the female fitting 2 and the male fitting 3 are separated. FIG. 2 is a vertical cross-sectional view of the fire-fighting fitting 1 shown in FIG. 1, in a state in which the female fitting 2 and the male fitting 3 are joined. FIG. 3 is a view showing the female fitting 2 from the EE direction of FIG. 1, in a state in which the receiving fitting 5 and the rubber tire 12 are removed. FIG. 4 is a view showing the male fitting 3 and the contact prevention member 4 from the FF direction of FIG. 1. FIG. 5 is a front view of the push ring 18 shown in FIG. 1. FIG. 6(A) is a left side view of the contact prevention member 4 shown in FIG. 1, FIG. 6(B) is a front view of the contact prevention member 4 shown in FIG. 1, and FIG. 6(C) is a right side view of the contact prevention member 4 shown in FIG. 1. FIG. 7 is a vertical cross-sectional view showing a state different from that of FIG. 2 of the fire-fighting fitting 1 shown in FIG. 2.

[0023] The fire connector 1 of this embodiment (hereinafter referred to as "connector 1") is a plug-in type connector for connecting fire hoses to each other or connecting a fire hose to a fire hydrant valve. As shown in FIG. 1 etc., the connector 1 is equipped with a female connector 2 that is connected to the end of a fire hose H, and a male connector 3 that is connected to the end of a fire hose H and into which the female connector 2 is detachably inserted. The connector 1 also has a contact prevention member 4 that is arranged on the outer periphery of the male connector 3. The connector 1 is composed of the female connector 2, the male connector 3, and the contact prevention member 4.

[0024] The female fitting 2 and the male fitting 3 are joined so that the axial direction of the female fitting 2 and the axial direction of the male fitting 3 coincide. In the following description, the axial direction of the joined fitting 1 when the female fitting 2 and the male fitting 3 are joined (i.e., the axial direction of the female fitting 2 and the male fitting 3) is the left-right direction. Also, the X1 direction side in FIG. 1, etc., which is one side of the left-right direction, is the "right" side, and the X2 direction side in FIG. 1, etc., which is the opposite side to the right side, is the "left" side. In this embodiment, the female fitting 2 in the separated state is inserted into the male fitting 3 from the right side to join the female fitting 2 and the male fitting 3. That is, the female fitting 2 is joined to the male fitting 3 from the right side. Also, the female fitting 2 in the joined state is pulled out of the male fitting 3 to the right side to separate the female fitting 2 and the male fitting 3. The left side (X2 direction side) of this embodiment is the first direction side, and the right side (X1 direction side) is the second direction side.

[0025] The female fitting 2 includes a receiving fitting 5, a tightening ring 6 having a cylindrical tube portion 6a attached to the receiving fitting 5, a claw seat 7 attached to the inner periphery of the tube portion 6a, three coupling claws 8 protruding radially inward from the inner periphery of the claw seat 7 and engaging with the male fitting 3, and a biasing member 9 that biases the coupling claws 8 radially inward. In this embodiment, the left end of the female fitting 2 is the tip of the female fitting 2, and the right end of the female fitting 2 is the base end of the female fitting 2. The tube portion 6a in this embodiment is a tightening ring tube portion.

[0026] The receiving fitting 5 can be connected to a fire hose H. The receiving fitting 5 is composed of a substantially cylindrical hose connection part 5a that is inserted into the fire hose H, and a substantially cylindrical socket part 5b that is connected to the hose connection part 5a. The end of the fire hose H is disposed on the outer periphery of the hose connection part 5a. The socket part 5b is formed at the left end (tip) of the receiving fitting 5. The socket part 5b is provided with a cylindrical seal arrangement part 5c in which a U-packing 11 that prevents water leakage when the female fitting 2 and the male fitting 3 are joined is arranged, and a slip-out prevention part 5d that prevents the U-packing 11 from slipping out to the left side. The slip-out prevention part 5d is formed in a substantially cylindrical shape with an inner diameter smaller than the inner diameter of the seal arrangement part 5c. A male screw for attaching a tightening ring 6 is formed on the left end side of the outer periphery of the socket part 5b.

[0027] The tightening ring 6 is attached to the left end side of the receiving metal fitting 5. The tightening ring 6 constitutes the left end of the female metal fitting 2. The tightening ring 6 is composed of the above-mentioned tubular portion 6a and the annular portion 6b formed in an annular and flat plate shape and connected to the tubular portion 6a. A female thread is formed on the right end side of the inner peripheral surface of the tubular portion 6a, which screws into the male thread of the receiving mouth portion 5b. A protective rubber tire 12 is fitted on the outer peripheral surface of the tubular portion 6a. The annular portion 6b is connected to the left end side of the tubular portion 6a. The inner diameter of the annular portion 6b is smaller than the inner diameter of the tubular portion 6a. In addition, the inner diameter of the annular portion 6b is larger than the inner diameter of the slip-out prevention portion 5d. The left surface of the annular portion 6b is the left end surface 6c of the tightening ring 6. The left end surface 6c constitutes the left end surface of the female metal fitting 2. In addition, the left end surface 6c is an annular flat surface perpendicular to the left-right direction. The left end surface 6c in this embodiment is a tightening ring end surface.

[0028] The claw seat 7 is formed in a generally cylindrical shape with a flange, and is composed of an annular portion 7a formed in a circular and flat plate shape, and three locking portions 7b that engage with the connecting claws 8 to regulate the amount of protrusion of the connecting claws 8 inward in the radial direction. The annular portion 7a constitutes the left end of the claw seat 7. The locking portions 7b are formed to protrude from the inner peripheral end of the annular portion 7a toward the right side. The locking portions 7b are formed in a generally arc shape. The three locking portions 7b are formed at equal angular intervals with a predetermined interval in the circumferential direction of the annular portion 7a, and the spaces between the locking portions 7b form notches 7c into which the connecting claws 8 protruding inward in the radial direction are fitted. The inner diameter of the claw seat 7 is generally equal to the inner diameter of the annular portion 6b of the tightening ring 6.

[0029] The connecting claw 8 is a block member formed in a substantially arc shape. The connecting claw 8 has a protruding portion 8a protruding radially inward from the notch 7c. Both ends of the connecting claw 8 can come into contact with the ends of the locking portion 7b, and the amount of protrusion of the connecting claw 8 radially inward is restricted by the contact of both ends of the connecting claw 8 with the ends of the locking portion 7b. The inner peripheral surface of the protruding portion 8a is formed in a convex curved shape that bulges radially inward from the left end side to the right end side.

[0030] 3, the claw seat 7 is fitted into the inner periphery of the tubular portion 6a of the tightening ring 6 with the protrusion 8a of the connecting claw 8 fitted into the notch 7c of the claw seat 7. The tightening ring 6 with the claw seat 7 fitted into it is attached to the left end side of the socket portion 5b, and the claw seat 7 is housed inside the tightening ring 6 while being sandwiched between the slip-out prevention portion 5d and the annular portion 6b in the left-right direction. The connecting claw 8 is movable in the radial direction between the slip-out prevention portion 5d and the annular portion 7a.

[0031] The biasing member 9 is, for example, composed of two leaf springs. The biasing member 9 is fixed to approximately the center of the outer circumferential surface of the connecting claw 8. The biasing member 9 is disposed between the inner circumferential surface of the tubular portion 6a of the tightening ring 6 and the outer circumferential surface of the connecting claw 8, and biases the connecting claw 8 radially inward.

[0032] The male fitting 3 is equipped with a plug fitting 17 whose tip engages with the coupling claws 8 when the female fitting 2 and the male fitting 3 are coupled, a press ring 18 that is slidably attached to the outer periphery of the plug fitting 17, and a retaining ring 19 to prevent the press ring 18 from coming off the plug fitting 17. In this embodiment, the right end of the male fitting 3 is the tip of the male fitting 3, and the left end of the male fitting 3 is the base end of the male fitting 3.

[0033] The metal insert 17 can be connected to a fire hose H. The metal insert 17 is composed of a substantially cylindrical hose connection part 17a that is inserted into the fire hose H, a cylindrical slide part 17b on the outer periphery of which the push ring 18 slides, and a cylindrical engagement protrusion 17c that engages with the connection claw 8 when the female fitting 2 and the male fitting 3 are joined. The end of the fire hose H is disposed on the outer periphery of the hose connection part 17a. The slide part 17b is formed so as to be connected to the right end side (tip side) of the hose connection part 17a. The engagement protrusion 17c is formed on the right end side of the metal insert 17 so as to be connected to the slide part 17b, and constitutes the right end part of the metal insert 17. The outer diameter of the engagement protrusion 17c is larger than the outer diameter of the slide part 17b. The outer diameter of the engagement protrusion 17c is smaller than the inner diameter of the slip-out prevention part 5d of the receiving fitting 5.

[0034] As shown in Fig. 5, the push ring 18 has a cylindrical portion 18a formed in a cylindrical shape with the left-right direction as the axial direction, and a circular ring-shaped, flat flange portion 18b extending from the left end of the cylindrical portion 18a to the outside in the radial direction of the cylindrical portion 18a. The push ring 18 is composed of the cylindrical portion 18a and the flange portion 18b, and is formed in a cylindrical shape with a flange. The cylindrical portion 18a in this embodiment is a push ring tube portion.

[0035] The inner diameter of the pressing ring 18 is larger than the outer diameter of the sliding portion 17b. The inner diameter of the pressing ring 18 is smaller than the outer diameter of the engaging protrusion 17c. The outer diameter of the cylindrical portion 18a is smaller than the inner diameter of the annular portion 6b and the inner diameter of the claw seat 7. The outer diameter of the cylindrical portion 18a is larger than the outer diameter of the engaging protrusion 17c. The pressing ring 18 is disposed on the outer periphery side of the sliding portion 17b and is slidable in the left-right direction. The right part of the pressing ring 18 (i.e., the right part of the cylindrical portion 18a) is inserted into the inner periphery side of the claw seat 7 when the engagement state between the insert 17 and the connecting claw 8 is released (specifically, when the engagement state between the engaging protrusion 17c and the connecting claw 8 is released), and moves the connecting claw 8 to the radial outside of the claw seat 7 (see FIG. 7(A)).

[0036] The retaining ring 19 is attached to the boundary between the hose connection portion 17a and the sliding portion 17b. The outer diameter of the retaining ring 19 is larger than the inner diameter of the pressing ring 18. The retaining ring 19 is disposed to the left of the pressing ring 18, and prevents the pressing ring 18 from slipping out of the insert 17 to the left. The retaining ring 19 also prevents the contact prevention member 4 from slipping out of the insert 17 to the left.

[0037] The contact prevention member 4 is disposed on the outer periphery of the metal insert 17. The contact prevention member 4 includes a cylindrical tube portion 4a in which the push ring 18 is disposed on the inner periphery, and a cover portion 4b connected to the inner periphery of the left end portion of the tube portion 4a. The contact prevention member 4 of this embodiment is composed of the tube portion 4a and the cover portion 4b. The tube portion 4a is formed in a cylindrical shape. The cover portion 4b is formed in an annular and flat shape. Specifically, the cover portion 4b is formed in a flat plate shape with the thickness direction being the left-right direction. In addition, the cover portion 4b is formed in an annular shape connected to the inner periphery of the tube portion 4a. In this embodiment, the right surface 4c of the cover portion 4b is the cover end portion, which is the right end portion of the cover portion 4b.

[0038] The length of the contact prevention member 4 in the left-right direction is shorter than the length of the pressing ring 18 in the left-right direction. The inner diameter of the tube portion 4a is larger than the outer diameter of the flange portion 18b of the pressing ring 18. The outer diameter of the tube portion 4a is smaller than the outer diameter of the left end surface 6c of the tightening ring 6. The inner diameter of the cover portion 4b is larger than the outer diameter of the slide portion 17b. The inner diameter of the cover portion 4b is smaller than the outer diameter of the retaining ring 19. The cover portion 4b is disposed to the left of the flange portion 18b of the pressing ring 18. The contact prevention member 4 functions to prevent an obstacle or the like from directly contacting the flange portion 18b from the left side. The cover portion 4b is disposed to the right of the retaining ring 19 (i.e., the contact prevention member 4 is disposed to the right of the retaining ring 19), and as described above, the contact prevention member 4 is prevented from coming off the insert 17 to the left by the retaining ring 19.

[0039] The contact prevention member 4 is slidable relative to the insert 17 when the female fitting 2 and the male fitting 3 are separated. That is, the contact prevention member 4 is slidable in the left-right direction relative to the insert 17 when the female fitting 2 and the male fitting 3 are separated. As shown in FIG. 7, when the female fitting 2 and the male fitting 3 are joined, the right end face 4d of the tubular portion 4a can contact the left end face 6c of the fastening ring 6. In this embodiment, when the female fitting 2 and the male fitting 3 are joined, the left-right distance between the left end face 6c and the retaining ring 19 is longer than the left-right length of the contact prevention member 4, so that the contact prevention member 4 is slidable in the left-right direction relative to the insert 17 even when the female fitting 2 and the male fitting 3 are joined. The right end face 4d in this embodiment is the end face of the tubular portion.

[0040] The contact prevention member 4 is formed with a notch 4e for pushing the flange 18b to the right. The notch 4e is formed at two locations in the circumferential direction of the tubular portion 4a. Specifically, the notch 4e is formed at two locations at a pitch of 180° around the axis of the tubular portion 4a. The notch 4e is formed from the cover portion 4b to the tubular portion 4a. Specifically, the notch 4e is formed from a relatively close portion of the inner circumferential surface of the cover portion 4b to the center of the tubular portion 4a in the left-right direction. When the contact prevention member 4 is viewed from the left side, a part of the flange 18b can be seen in the notch 4e. The width of the notch 4e in the circumferential direction of the tubular portion 4a is set to a width that allows the thumb of the person operating the fastener 1 to enter the notch 4e, and the person operating the fastener 1 can push the flange 18b to the right from the left side using the thumb placed in the notch 4e.

[0041] When the female fitting 2 and the male fitting 3 are connected, the position of the press ring 18 (the position shown in Figure 7(A)) when the engagement between the connecting claw 8 and the insert fitting 17 can be released (more specifically, when the connecting claw 8 moves radially outward from the outer circumferential surface of the engaging protrusion 17c) is defined as the releasable position 18A.As shown in Figure 7(A), when the right end face 4d of the tubular portion 4a is in contact with the left end face 6c of the tightening ring 6 and the press ring 18 is positioned in the releasable position 18A, the right surface 4c of the cover portion 4b is positioned to the left of the left surface of the flange portion 18b of the press ring 18, and a gap is formed between the right surface 4c of the cover portion 4b and the left surface of the flange portion 18b in the left-right direction.

[0042] Furthermore, when the female fitting 2 and the male fitting 3 are connected, if the position of the press ring 18 when the right end of the cylindrical portion 18a of the press ring 18 comes into contact with the connecting claw 8 (the position shown in Figure 7(B)) is defined as the contact start position 18B, then when the right end face 4d of the cylindrical portion 4a is in contact with the left end face 6c of the tightening ring 6 and the press ring 18 is positioned at the contact start position 18B as shown in Figure 7(B), the right face 4c of the cover portion 4b is positioned to the left of the left face of the flange portion 18b of the press ring 18 or is in contact with the left face of the flange portion 18b.

[0043] When the female fitting 2 and the male fitting 3 are joined in the joining fitting 1, the female fitting 2 is inserted into the insert fitting 17 from the right side. When the female fitting 2 is inserted to a position where the engaging protrusion 17c exceeds the joining claw 8, the left end of the engaging protrusion 17c engages with the right end of the protruding portion 8a of the joining claw 8, and the female fitting 2 and the male fitting 3 are joined. On the other hand, when the female fitting 2 is removed from the male fitting 3, the pressing ring 18 is pushed to the right side to the releasable position 18A. At this time, the thumb is placed on the notch 4e of the contact prevention member 4, and the flange portion 18b is pushed to the right side. When the pressing ring 18 is pushed to the releasable position 18A, the joining claw 8 moves radially outward from the outer circumferential surface of the engaging protrusion 17c, and the engagement state between the engaging protrusion 17c and the protruding portion 8a is released. In this state, the female fitting 2 is pulled out of the male fitting 3, and the female fitting 2 and the male fitting 3 are separated.

[0044] (Main effects of this form) As described above, in this embodiment, the push ring 18 is arranged on the inner periphery of the tubular portion 4a of the contact prevention member 4, and the flange portion 18b of the push ring 18 is arranged to the right of the cover portion 4b that connects to the inner periphery of the left end portion of the tubular portion 4a, and the contact prevention member 4 functions to prevent obstacles, etc. from coming into direct contact with the flange portion 18b from the left side. In addition, in this embodiment, when the right end face 4d of the tube portion 4a is in contact with the left end face 6c of the tightening ring 6 and the push ring 18 is positioned in the releasable position 18A, the right face 4c of the cover portion 4b is positioned to the left of the left face of the flange portion 18b, and a gap is formed between the right face 4c of the cover portion 4b and the left face of the flange portion 18b.Therefore, when the female fitting 2 and the male fitting 3 are connected, even if an obstacle or the like comes into contact with the contact prevention member 4 from the left side and pushes the contact prevention member 4 to the right, the push ring 18 will not be pushed to the releasable position 18A by the contact prevention member 4.

[0045] Therefore, in this embodiment, when the female fitting 2 and the male fitting 3 are coupled, it is possible to reliably prevent the push ring 18 from being pushed into the releasable position 18A by an obstacle or the like by using the contact prevention member 4. That is, in this embodiment, it is possible to reliably prevent the push ring 18 from being accidentally pushed into the releasable position 18A when the female fitting 2 and the male fitting 3 are coupled.

[0046] In addition, in this embodiment, when the right end surface 4d of the tube portion 4a is in contact with the left end surface 6c of the tightening ring 6 and the pressing ring 18 is located at the contact start position 18B, the right surface 4c of the cover portion 4b is located to the left of the left surface of the flange portion 18b of the pressing ring 18, or is in contact with the left surface of the flange portion 18b. Therefore, even if an obstacle or the like contacts the contact prevention member 4 from the left side and pushes the contact prevention member 4 to the right when the female metal fitting 2 and the male metal fitting 3 are coupled, the pressing ring 18 will not be pushed to the right of the contact start position 18B by the contact prevention member 4. Therefore, in this embodiment, it is possible to more reliably prevent the pressing ring 18 from being accidentally pushed to the releasable position 18A when the female metal fitting 2 and the male metal fitting 3 are coupled.

[0047] In addition, in this embodiment, because the cover portion 4b is formed in an annular shape, it is easier to prevent an obstacle or the like from directly contacting the flange portion 18b from the left side. Therefore, in this embodiment, it is possible to more reliably prevent the push ring 18 from being accidentally pushed up to the releasable position 18A when the female fitting 2 and the male fitting 3 are coupled.

[0048] In this embodiment, when the female metal fitting 2 and the male metal fitting 3 are separated, the contact-preventing member 4 is slidable relative to the insert fitting 17, and the contact-preventing member 4 is not fixed to the insert fitting 17. Therefore, in this embodiment, the installation work of the contact-preventing member 4 can be easily performed. Specifically, in this embodiment, the installation of the contact-preventing member 4 is completed by inserting the insert fitting 17 into the inner periphery of the contact-preventing member 4 and the press ring 18 and attaching the retaining ring 19, so that the installation work of the contact-preventing member 4 can be easily performed.

[0049] In this embodiment, a retaining ring 19 is disposed to the left of the cover portion 4b, and the retaining ring 19 prevents the contact prevention member 4 from coming off the insert metal fitting 17 to the left. Therefore, in this embodiment, even when the female metal fitting 2 and the male metal fitting 3 are separated, it is possible to prevent the contact prevention member 4 from coming off the insert metal fitting 17. Therefore, in this embodiment, the contact prevention member 4 is easy to handle.

[0050] (Example 1 of changes to contact prevention parts) Fig. 8 is a diagram for explaining the configuration of a contact-preventing member 4 according to another embodiment of the present invention. Fig. 8(B) is a diagram showing the male metal fitting 3 and the contact-preventing member 4 from the direction GG of Fig. 8(A).

[0051] In the above embodiment, the inner diameter of the cover portion 4b of the contact prevention member 4 may be larger than the outer diameter of the retaining ring 19. That is, the cover portion 4b may be formed in a circular ring shape with a large inner diameter. In this case, as shown in FIG. 8, an annular gap S for pushing the flange portion 18b of the press ring 18 to the right is formed between the inner peripheral surface of the cover portion 4b and the outer peripheral surface of the slide portion 17b of the insert fitting 17, and the contact prevention member 4 does not have a notch portion 4e. The gap S is formed in a circular ring shape. The width of the gap S in the radial direction of the tube portion 4a is set to a width that allows the thumb of a person operating the connecting fitting 1 to enter the gap S, and the person operating the connecting fitting 1 can use the thumb placed in the gap S to push the flange portion 18b to the right from the left side.

[0052] (Example 2 of changes to contact prevention parts) FIG. 9 is a diagram for explaining the configuration of a contact-preventing member 4 according to another embodiment of the present invention.

[0053] In the above-described embodiment, the contact-preventing member 4 may be formed by a plurality of divided bodies 24 divided in the circumferential direction of the cylindrical portion 4a, and the plurality of divided bodies 24 are fixed together. For example, as shown in FIG. 9, the contact-preventing member 4 may be formed by two divided bodies 24 divided equally into two in the circumferential direction of the cylindrical portion 4a. In this case, for example, a plurality of pins 25 protruding in the circumferential direction of the cylindrical portion 4a are fixed to one of the divided bodies 24, and holes 24a into which the pins 25 are press-fitted are formed in the other divided body 24, and the two divided bodies 24 are fixed together by pressing the pins 25 into the holes 24a. The two divided bodies 24 may be fixed together by a means other than press-fitting.

[0054] 8, the contact-preventing member 4 may be composed of a plurality of divided bodies 24 divided in the circumferential direction of the tubular portion 4a, and may be formed by fixing the plurality of divided bodies 24 together. In these cases, it becomes possible to later attach the contact-preventing member 4 to the outer periphery of a male fitting 3 that is already in use or a male fitting 3 that is available on the market. In other words, it becomes possible to later attach the contact-preventing member 4 to the outer periphery of the male fitting 3. The contact-preventing member 4 may be composed of three or more divided bodies divided in the circumferential direction of the tubular portion 4a.

[0055] (Other embodiments) In the above-described embodiment, the notch 4e may be formed in three or more places in the circumferential direction of the tubular portion 4a. Also, in the above-described embodiment and modified example, the left-right distance between the left end face 6c of the fastening ring 6 and the retaining ring 19 when the female fitting 2 and the male fitting 3 are joined may be equal to the left-right length of the contact-preventing member 4, and the contact-preventing member 4 may not be able to slide left-right relative to the insert fitting 17 when the female fitting 2 and the male fitting 3 are joined.

[0056] In the above-described embodiment and modified example, when the right end face 4d of the tube portion 4a is in contact with the left end face 6c of the tightening ring 6, the right face 4c of the cover portion 4b may be in contact with the left face of the flange portion 18b, and the pressing ring 18 may be disposed at a predetermined position between the contact start position 18B and the releasable position 18A in the left-right direction. Even in this case, when an obstacle or the like comes into contact with the contact-preventing member 4 from the left side and pushes the contact-preventing member 4 to the right while the female fitting 2 and the male fitting 3 are coupled, the pressing ring 18 will not be pushed to the releasable position 18A by the contact-preventing member 4.

[0057] In the above-described embodiment, the cover portion 4b does not have to be formed in an annular shape. In this case, for example, a plurality of cover portions 4b formed in an arc-like and flat plate shape are arranged at a predetermined pitch in the circumferential direction of the cylindrical portion 4a. In this case, the notch portion 4e does not have to be formed in the contact prevention member 4. Also, in the above-described embodiment, the cover portion 4b does not have to be formed in a flat plate shape. Also, in the above-described modified example, the cover portion 4b does not have to be formed in an annular shape or in a flat plate shape.

[0058] In the above-described embodiment, the end of the fire hose H may be disposed on the inner periphery side of the hose connecting portion 5a. Similarly, in the above-described embodiment, the end of the fire hose H may be disposed on the inner periphery side of the hose connecting portion 17a.

[0059] In the above-mentioned embodiment, the female fitting 2 may be a pipe having a nozzle for discharging water attached to its tip (right end). In this case, a nozzle coupling part for coupling a nozzle is fixed to the tip (right end) of the receiving fitting 5. Also, in the above-mentioned embodiment, the female fitting 2 may be an intermediate fitting for connecting a female fitting other than the female fitting 2 to the male fitting 3. For example, the female fitting 2 may be an intermediate fitting for connecting a male fitting 3 having a different inner diameter to the female fitting. In this case, the female fitting 2 is provided with a push ring, and the right side portion of the female fitting 2 is configured similarly to the right side portion of the male fitting 3. [Explanation of symbols]

[0060] 1. Fittings (Fire-fighting fittings) 2 Female fitting 3 Male fitting 4 Contact prevention parts 4a Cylindrical part 4b Cover part 4c Right side (cover end) 4d Right end face (tube end face) 4e Notch 5 Bracket 6 Fastening Ring 6a Cylinder section (clasp ring cylinder section) 6c Left end face (fastening ring end face) 7 Claw seat 8 Connecting claws 9. Pressing member 17 Insert 18 Push Ring 18A Releasable position 18B Contact start position 18a Cylindrical part (push ring tube part) 18b Tsuba 19 Retaining ring 24 split body S Gap X1 2nd direction side X2 1st direction side

Claims

1. In a plug-in type fire-fighting coupling having a female fitting and a male fitting, a contact prevention member disposed on an outer circumferential side of the male fitting, The female fitting comprises a receiving fitting, a fastening ring having a cylindrical fastening ring sleeve portion attached to the receiving fitting, a claw seat attached to the inner peripheral side of the fastening ring sleeve portion, a coupling claw protruding radially inward from the inner peripheral surface of the claw seat and engaging with the male fitting, and a biasing member biasing the coupling claw radially inward of the claw seat, The male fitting includes a metal insert having a tip portion that engages with the coupling claw when the female fitting and the male fitting are coupled together, and a push ring that is slidably attached to the outer periphery of the metal insert, When the female fitting and the male fitting are joined, one side in the axial direction of the fire-fighting fitting is defined as a first direction side, and the opposite side to the first direction side is defined as a second direction side. The female fitting is coupled to the male fitting from the second direction side, The fastening ring end face, which is the end face on the first direction side of the fastening ring, constitutes the end face on the first direction side of the female fitting and has an annular flat surface perpendicular to the axial direction of the fire connecting fitting, The push ring includes a push ring tube portion formed in a cylindrical shape with the axial direction of the fire connecting fitting as its axial direction, and a circular ring-shaped and flat flange portion extending radially outward from the end of the push ring tube portion on the first direction side, The end portion of the press ring tubular portion on the second direction side is inserted into the inner peripheral side of the claw seat when the engagement between the connecting claw and the insert metal fitting is released, and moves the connecting claw to the radially outer side of the claw seat, the contact prevention member includes a cylindrical portion having an inner periphery on which the push ring is disposed, and a cover portion connected to the inner periphery of an end portion of the cylindrical portion on the first direction side, and is slidable relative to the insert metal member when the female metal member and the male metal member are separated from each other, The cover portion is disposed on a first direction side relative to the flange portion, The end surface of the cylindrical portion on the second direction side is capable of contacting the end surface of the fastening ring, When the engagement between the connecting claw and the insert metal fitting is released, the position of the push ring is set to a release position. A fire-fighting fastening fitting characterized in that, when the end face of the tubular portion is in contact with the end face of the fastening ring and the push ring is positioned in the releasable position, the cover end, which is the end portion on the second direction side of the cover portion, is positioned on the first direction side of the first direction side surface of the flange portion.

2. If the position of the press ring when the second direction side end of the press ring tube portion contacts the connecting claw is defined as a contact start position, A fire-fighting fitting as described in claim 1, characterized in that when the end face of the tube portion is in contact with the end face of the fastening ring and the push ring is positioned at the contact start position, the cover end is positioned on the first direction side of the first direction side surface of the flange portion, or is in contact with the first direction side surface of the flange portion.

3. 3. The fire fitting according to claim 1, wherein the cover portion is formed in an annular, flat shape connected to an inner periphery of an end portion of the cylindrical portion on the first direction side.

4. The contact prevention member is formed with a notch for pushing the flange portion in the second direction, 4. The fire connector according to claim 3, wherein the notch is formed at least at two locations in the circumferential direction of the cylindrical portion and is formed from the cover portion to the cylindrical portion.

5. The male fitting includes a retaining ring for preventing the push ring from coming off the insert fitting in a first direction, The cover portion is disposed on a second direction side relative to the retaining ring, 5. The fire connector according to claim 4, wherein the retaining ring prevents the contact prevention member from coming off the insert in the first direction.

6. The fire-fighting fitting as described in claim 3, characterized in that an annular gap is formed between the inner surface of the cover portion and the outer surface of the insert fitting for pushing the flange portion in the second direction.

7. The fire-fighting fastener described in any one of claims 1 to 6, characterized in that the contact prevention member is composed of a plurality of divided bodies divided in the circumferential direction of the tubular portion, and is formed by fixing the plurality of divided bodies.

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