JP4825895B2 - Rotating joint for pipes - Google Patents

Description

  The present invention relates to a rotatable joint for pipes that can be used for connecting a watering nozzle and a domestic hose, etc., and can prevent the hose from being twisted by making the joint rotatable with respect to a direction orthogonal to the axis. It is.

In recent years, the watering nozzle can open and close the watering valve at hand when watering the garden using a household hose, and the shape of the watering can be changed freely at the hand such as shower, mist, straight etc. It is generally used because it is very convenient.
However, the conventional watering nozzle has the following problems.
(1) If the watering nozzle is carried around and used repeatedly in various directions, the connected hose is twisted and the hose is crushed, so that the pipe line of the hose is blocked and water does not come out from the watering nozzle.
(2) If the hose is wound around the hose winder while being twisted, the hose cannot be evenly wound because it is wound without removing the twist.
(3) In order to wind up the hose uniformly, it is necessary to wind the hose winder while removing the hose twisting by rotating the watering nozzle in the direction opposite to the twisting, so that the workability is inferior and remains in the hose. Water that had been splattered around.
In order to solve these problems, a rotatable joint for a pipe has been studied.
For example, (Patent Document 1) states that “a base end fixing tube having an annular groove on the peripheral surface is connected to the base end portion of the nozzle body, and the outside of the base end fixing tube is rotated via a connection ring. Freely fitting the tube, the lower end of the rotating tube can be removably connected to the tip of the hose, and the coupling ring is a claw that can be fitted in a fitting groove formed on the outer peripheral surface of the rotating tube A plurality of protrusions projecting inward, and the claw portions are configured to be slidably fitted into the annular groove portion of the base end fixed tube, so that the connecting ring and the rotary tube are integrated with each other. "A structure configured to be rotatable on the outer periphery of the end fixed tube" is disclosed.
In addition, (Patent Document 2) states that “a male joint having a distal end cylinder portion having an outer diameter larger than the outer diameter of the proximal end tubular portion is provided on the distal end side and a ring-shaped packing is provided on the outer periphery of the distal end tubular portion. By inserting the tip tube portion into the female joint, the male joint is connected to the female joint so as to be rotatable about its axis, and the pipe is used for connecting a watering nozzle or the like to a hose or the like. A female joint body having a cylindrical shape with a concave portion formed on an inner peripheral surface, and a ring shape having an appropriate elasticity and being reduced in diameter by elastic deformation. A locking member that is inserted inside the joint body, has a projecting portion that expands in diameter and is fitted into the recess of the female joint body in a retaining manner, and has a locking piece that is bent inward. The locking member has a convex portion with the female joint The minimum inner diameter formed by the locking piece when fitted into the concave portion of the male joint is smaller than the outer diameter of the distal end tubular portion of the male joint to be inserted, and the diameter is increased by inserting the distal end tubular portion. And the distal end tube portion is positioned on the distal end side beyond the engagement piece of the female joint, so that the engagement piece is reduced in diameter on the outer peripheral surface side of the proximal end tubular portion of the male joint. And the rear end face side of the portion are configured to be locked in a retaining manner ”.

JP-A-4-78458 JP-A-10-238678

However, the above conventional technique has the following problems.
(1) Since a separately produced connecting ring or locking member is required, the number of parts is large and productivity is lacking.
(2) The connection ring or the locking member must be separately attached to the main body, and the work is complicated and lacks workability, and the number of man-hours is large, so the productivity is lacking.

  The present invention solves the above-mentioned conventional problems, can easily eliminate twisting of a hose to be connected, has a small number of parts, is excellent in workability during production and assembly, and is remarkably simple in structure. The object is to provide a rotatable joint for pipes with excellent productivity.

In order to solve the above-mentioned conventional problems, the rotatable joint for pipes of the present invention has the following configuration.
According to a first aspect of the present invention, there is provided a rotatable joint for a pipe which is formed in a substantially cylindrical shape and has a base end fixed pipe having a locking annular groove on an outer peripheral surface, and is formed in a substantially cylindrical shape and rotates to the base end fixed pipe. A rotating tube that is freely fitted, a locking portion main body formed in the shape of a tongue on the peripheral surface of the rotating tube, and protruding from the inside of the distal end of the locking portion main body and coming out of the annular groove for locking A locking claw portion that is locked in a stopper shape, a cover body that is formed in a substantially cylindrical shape and is externally fitted to the locking portion body, and a retaining member that prevents the cover body from coming off from the locking portion body And the retaining means is a cover body insertion protrusion projecting from one or both of the rotating tube and the cover body.
With this configuration, the following effects can be obtained.
(1) Since the locking portion main body, the locking claw portion, and the rotary tube are integrally formed, the number of parts can be reduced without requiring additional locking means as in the prior art.
(2) Since the locking part main body, the locking claw part, and the rotating tube are integrally formed, it is not necessary to separately incorporate the locking means as in the prior art, and the manufacturing and mounting man-hours can be reduced. .
(3) By simply inserting the rotating tube into the base end fixed tube, the locking claw portion is loosely fitted into the locking annular groove due to the elasticity of the locking portion body, so that the assembly workability is remarkably improved. Can be made.
(4) By externally fitting the cover body to the locking portion main body, it is possible to prevent and protect the locking portion main body from being loaded from the outside.
(5) Since the protrusion for inserting the cover body serves as a retaining means, it is possible to protect the locking portion main body with the cover body and prevent the cover body from falling off.

Here, as a material of the base end fixed tube and the rotating tube, a synthetic resin, in particular, a resin such as ABS is light and excellent in moldability, and thus is preferably used. In addition, the oil-resistant synthetic resin is preferably used because it can flow not only water but also water and fat / oil itself mixed with fat / oil components to the proximal end fixing tube and has excellent durability.
The locking portion main body is formed in one to a plurality of locations on the rotary tube, and the locking portion main body has a long rectangle in the axial direction, a short rectangle in the axial direction, a square, a triangle, or the like. In particular, the rectangular shape that is long in the axial direction has a large amount of warping to the outside due to the force from the inside, so that when the locking claw is locked to the locking annular groove, the locking portion body cannot withstand the warping. It is preferably used because it is not broken and has excellent durability.
The shape of the cross section of the locking part body is a flat plate shape on both sides, a curved plate shape that matches the shape of the rotating tube on both sides, a flat plate shape on the outer surface, and a curved plate shape whose inner surface matches the shape of the rotating tube, The outer surface is a curved plate shape matching the shape of the rotary tube, and the inner surface is a flat plate shape. In particular, the curved plate shape that matches the shape of the rotating tube on both sides is uniform in thickness and excellent in durability, and the load is uniformly applied because there is no gap between the base end fixed tube and the locking part body. Therefore, it is preferably used.
Reinforcing ribs can be provided inside the proximal end fixed tube and the rotating tube as necessary. Thereby, the strength of the proximal fixed tube and the rotating tube can be increased, which is preferable. The direction of the reinforcing rib may be formed parallel to the axial direction and perpendicular to the axial direction. However, it is preferable that the reinforcing rib is parallel to the axial direction because the resistance to water flow is small and the reinforcing can be performed uniformly.
Reinforcing ribs can be provided on the outer periphery of the base end fixed tube and the rotating tube as needed. Thereby, since the intensity | strength of a base end fixed tube and a rotary tube can be raised, it is preferable. The direction of the reinforcing rib may be formed parallel to the axial direction and perpendicular to the axial direction, but it is preferable that the reinforcing rib is perpendicular to the axial direction because the reinforcing rib can be uniformly reinforced in the circumferential direction.
The shape of the locking claw portion is preferably formed in an arc shape in accordance with the outer periphery of the proximal end fixing tube. Thereby, when a latching claw part latches to the annular groove part for latching, it can put in smoothly and the load to a latching claw part can be made uniform.
Further, the locking claw portion is formed in a straight line at the end of the locking portion main body in parallel with the locking annular groove portion, and a plurality of the locking claw portions are parallel to the locking annular groove portion at the end of the locking portion main body. A method of forming a location is used. In particular, the method of forming the linearly parallel to the locking annular groove at the end of the locking part main body is preferably used because the load on the locking part main body is uniformly applied.
In addition, as the cross-sectional shape of the locking claw portion, a triangular shape, a trapezoidal shape, a trapezoidal shape with one side vertical, a rectangular shape, a semicircular shape, an arc shape, or the like is used. In particular, the trapezoidal shape in which the end surface on the side where the proximal end fixing tube is inserted is inclined and the end surface of the other locking claw portion is vertical is easy when locking the locking claw portion. It can be inserted, and once locked, it is less likely to come off because the opposite side is vertical this time.

Here, the shape of the protrusion for inserting the cover body is such that the rear end surface that comes into contact with the rotary tube or the cover body after assembly is perpendicular to the axis, and the front side that comes into contact when the rotary tube and the cover body are fitted together. The end surface is formed as an inclined surface. Thereby, when the cover body is locked, it can be easily inserted, and conversely, it cannot be easily removed, so that it is preferably used.
Regarding the material of the cover body, plastic is preferably used because it is excellent in molding and excellent in durability.
The outer peripheral surface of the cover body can be provided with irregularities, etc., which makes it easy to assemble the cover body and is excellent in workability and operability.

The invention according to claim 2 or claim 3 of the present invention, before Kigakaritome unit body has a structure which has a disengagement preventing protrusion protruding from the outside of the locking body .
With this configuration, in addition to the operation of the first aspect, the following operation can be obtained.
(1) If there is insufficient locking of the locking claw part of the locking part body during assembly, the detachment prevention protrusion will protrude to the outside and the cover body cannot be properly fitted to the original fitting position. Since the worker can easily detect the lack of engagement between the proximal fixed tube and the rotating tube, the workability is excellent.
(2) By fitting the cover body to the locking part main body, even when the outward force is applied to the locking claw part when the rotary tube is pulled strongly in the pulling direction, the detachment prevention protruding part is Since it is regulated by the cover body wall, the locking claw portion does not come off from the locking annular protrusion, and the reliability of the degree of component coupling is excellent.

Here, the shape of the detachment prevention protrusion is the same as that of the aforementioned locking claw. The contact surface of the locking claw portion with the locking annular protrusion is preferably formed so as to be convexly inclined with respect to the axial direction.
Further, the height of the detachment prevention protrusion is formed to be the same as or slightly lower than the cover body insertion flange. Thereby, the cover body can be easily inserted.

The invention according to claim 4 of the present invention is the rotatable joint for pipes according to any one of claims 1 to 3, wherein either the outer peripheral wall of the rotary pipe or the inner peripheral wall of the cover body is provided. One is provided with a groove-shaped guide rail portion extending in the axial direction, and the other is provided with a guide portion constituted by protrusions or axial ridges.
With this configuration, in addition to the actions described in claims 1 to 3, the following actions are obtained.
(1) At the time of assembling, the cover body can be externally fitted to the rotating tube by pushing the guide portion together with the guide rail portion to play the role of the guide.
(2) In the state where the cover body is externally fitted to the rotating tube, the rotating tube and the cover body do not rotate freely even if a rotational force is applied to the cover body. The lock nut can be screwed together, and the operability when installing the hose can be improved.

As described above, according to the invention described in claim 1, the tube-use rotatable joint of the present invention has the following advantageous effects.
(1) Since the locking part main body, the locking claw part, and the rotating tube are integrally formed, it is possible to reduce the number of parts without requiring additional locking means as in the prior art, and for pipes with excellent resource saving. A rotatable joint can be provided.
(2) Since the locking part main body, the locking claw part, and the rotating tube are integrally formed, it is possible to reduce the manufacturing and mounting man-hours without requiring a separate work for assembling the locking means as in the prior art. In addition, it is possible to provide a rotatable joint for pipes with excellent workability.
(3) Since the locking claw is not loosely fitted and locked in the locking annular groove due to the elasticity of the locking body simply by inserting the rotating tube into the base end fixed tube, workability during assembly It is possible to provide a rotatable joint for pipes excellent in the above.
(4) Since the cover body can be externally fitted to the locking portion main body to prevent and protect the locking portion main body from being loaded from the outside, it is possible to provide a rotatable joint for pipes having excellent durability. it can.
(5) Since the protrusion for inserting the cover body serves as a retaining means, it is possible to protect the locking portion main body with the cover body and prevent the cover body from falling off. Can be provided.

According to invention of Claim 2 or Claim 3, in addition to the effect of Claim 1, the following advantageous effects are acquired.
(1) If there is insufficient locking of the locking claw part of the locking part body during assembly, the detachment prevention protrusion will protrude to the outside and the cover body cannot be properly fitted to the original fitting position. An operator can easily detect the lack of engagement between the proximal fixed tube and the rotating tube, and can provide a rotatable joint for a tube having excellent workability.
(2) By fitting the cover body to the locking part main body, even when the outward force is applied to the locking claw part when the rotary tube is pulled strongly in the pulling direction, the detachment prevention protruding part is Since it is regulated by the cover body wall, the locking claw portion does not come off from the locking annular protrusion, and it is possible to provide a rotatable joint for pipes with excellent reliability of component coupling.

According to the invention described in claim 4, in addition to the effects described in any one of claims 1 to 3, the following advantageous effects can be obtained.
(1) At the time of assembling, the cover body can be externally fitted to the rotating tube by pushing the guide portion together with the guide rail portion to play the role of the guide.
(2) In the state where the cover body is externally fitted to the rotating tube, the rotating tube and the cover body do not rotate freely even if a rotational force is applied to the cover body. The lock nut can be screwed together, and the operability when installing the hose can be improved.

Cross-sectional end view showing a state in which the pipe joint in Embodiment 1 is attached to the watering nozzle Cross section of the main part of a rotatable joint for pipes (A) Perspective view of a rotary pipe for a pipe-type rotatable joint, (b) Side view of a rotary pipe for a pipe-type rotary joint. AA arrow sectional view of FIG. BB arrow sectional view of FIG. (A) The exploded perspective view before the assembly of the rotatable joint for pipes in Embodiment 1, (b) The exploded side view before the assembly of the rotatable joint for pipes in Embodiment 1. Schematic diagram when fitting the rotating tube to the proximal fixed tube

Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 or FIG.
(Embodiment 1)
FIG. 1 is a cross-sectional end view showing a state in which the pipe joint in Embodiment 1 is attached to a watering nozzle. In FIG. 1, 1 is a rotatable joint for pipes in Embodiment 1, and a base end fixed pipe 2 has a connecting means 3 connected to a watering nozzle at one end. Reference numeral 101 denotes a watering nozzle, which is formed of a nozzle body 102 formed in a pistol shape and a connecting means 103 having a female screw on the end of the nozzle body 102. 2 connecting means 3.

Next, details of each part of the rotatable joint for pipe of the first embodiment will be described with reference to the drawings.
FIG. 2 is a cross-sectional view of the main part of the rotatable joint for pipes, FIG. 3A is a perspective view of the rotary pipe for the rotatable joint for pipes, FIG. 3B is a side view thereof, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. 2, FIG. 5 is a cross-sectional view taken along the line BB in FIG. 2, and FIG. 6 (a) is an exploded perspective view before assembly of the rotatable joint for pipes according to the first embodiment. FIG. 6 (b) is an exploded side view before the assembly of the pipe rotatable joint according to the first embodiment.
2 to 6, reference numeral 2 denotes a proximal fixed tube, which is formed of synthetic resin such as ABS, and is formed into a concentric, different-diameter cylindrical shape by a proximal cylindrical portion 2a, a central cylindrical portion 2b, and a distal cylindrical portion 2c. The connecting means 3 is formed, and the outer peripheral surface of the proximal end cylinder portion 2a is threaded. The proximal end fixed tube 2 is provided with a proximal end flange portion 4 and an annular rib 5 protruding in an annular shape perpendicular to the axial direction from the proximal end tubular portion 2a side on the outer peripheral surface of the central tubular portion 2b. A stop annular groove 6 is provided perpendicularly to the axial direction, and a locking annular protrusion 7 is provided with an appropriate angle of inclination on the distal end tubular portion 2c side and is provided in an annular form perpendicular to the axial direction. Yes. Further, an O-ring groove portion 8 is provided around the outer peripheral surface of the distal end cylindrical portion 2c so as to be perpendicular to the axial direction, and a watertight O-ring 9 is fitted into the O-ring groove portion 8. Note that the outer diameter D1 of the locking annular groove 6 is smaller than the outer diameter D2 of the distal end cylindrical portion 2c.
Reference numeral 10 denotes a rotating tube having an end portion inserted into one end of the base end fixed tube 2, which is formed of the above-described synthetic resin or the like and has a flange 11 at the end, and the tube portion is a cover body insertion flange. A concentric, different-diameter cylindrical shape is formed by a distal end tubular portion insertion portion 12a for inserting the distal end tubular portion 2c of the proximal end fixed tube 2 from the 13th side, a small diameter tubular portion 12b, and a hose fitting portion 12c to which the hose H is fitted. Is formed. The outer peripheral surface of the small diameter cylindrical portion 12b is extended, and a fitting recess 12d for fitting the tip of the hose H is opened to form a lock nut screwing portion 12e. A reinforcing rib 12f that reinforces the lock nut screwing portion 12e is formed on the bottom wall of the fitting recess 12d.
One side is connected to the flange 11 at two opposing positions between the cover body insertion flange 13 and the flange 11 formed on the outer periphery of the base portion of the tip tube portion insertion portion 12a, and is opened on the peripheral surface of the rotary tube 10. And a locking portion window 14. Window reinforcement ribs 14 a and 14 b are provided on the side portions of the locking portion window portion 14 so as to be connected to the flange 11 at the same height as the cover body insertion flange 13 to form a frame portion. A locking portion main body 15 is provided in the frame portion of the locking portion window portion 14 and has a base portion connected in a tongue-like shape on the inner edge side of the flange 11. At the end of the locking portion main body 15, an arcuate or rectangular shape is provided on the inner side and abuts against the peripheral wall on the locking annular groove 6 side of the locking annular protrusion 7 of the proximal fixed tube 2 to prevent it from coming off. A locking claw portion 15a that is locked in a shape and a disengagement prevention projection 15b that prevents the locking claw portion 15a from coming off the locking annular projection 7 are formed on the outside. The locking claw portion 15a has an inclined surface 15a 'formed by inclining the flange 11 side at an angle corresponding to the elastic modulus of the locking portion main body 15. The contact surface 15a "is provided on the cover body insertion flange 13 side. Guide rail ribs 17 are formed on the outer sides of the window reinforcing ribs 14b with the guide rail portion 16 interposed therebetween, and an outer peripheral surface between the cover body insertion flange 13 and the flange 11. A cover body holding rib 18 for holding a cover body, which will be described later, is provided on the same line as the detachment prevention protrusion 15b, and the height of the cover body holding rib 18 is the same as that of the cover body insertion flange 13. Also, the cover body holding rib 18 is provided in parallel with the cover body insertion flange 13. Both ends of the cover body holding rib 18 may be connected to the window reinforcing rib 14a and the guide rail rib 17 or separated from each other. Hippo at the end of The body insertion flange 13 is cut away to form a guide insertion portion 19. Further, a screw portion 12e 'of the lock nut screwing portion 12e is inserted into a guide portion to be described later on the extension line of the guide rail portion 16. A notch-formed guide insertion portion 20 is formed.

On the inner peripheral wall of the cover body 21, a stepped portion 22 having a slightly larger diameter at one end on the proximal end fixed tube 2 side of the cover body 21 and a ridge or several protrusions in the axial direction from the peripheral end surface of the stepped portion 22 are formed. And a guide reinforcing portion 24 formed at the end of the guide portion 23 so as to be T-shaped at the same height as the guide portion 23. One or more cover body insertion protrusions 25 are provided on the inner peripheral wall on the other end side of the cover body 21 so as to be engaged with the annular stepped portion 13a of the rotary tube 10 at predetermined intervals from the guide portion 23 in the circumferential direction. . The flange 11 is formed to be slightly higher than the cover holding rib 18 and the like because the flange 11 is fitted to the stepped portion 22, and the end surface of the cover body 21 is substantially flush with the outer peripheral surface of the proximal flange portion 4 when the cover body 21 is externally fitted. It is formed to become. Thereby, the damage by the eccentric load of the base end fixed pipe 2 can be prevented.
The guide reinforcing portion 24 is formed integrally or discontinuously with the guide portion 23 so as to be T-shaped. As a result, even if a rotational force is applied to the cover body 21, the rotating tube 10 and the cover body 21 do not rotate freely. Therefore, the fastening member for the rotating tube 10 and a lock nut 27 described later with the cover body 21 fixed by hand. The screw 28 can be screwed together, and the operability when the hose H is attached can be improved. The cover body insertion protrusion 25 is in contact with an annular step portion 13a formed shallow on the outer peripheral side of the cover body insertion flange 13 in the thickness direction.

A hose H is fitted on the hose fitting portion 12c. The outer peripheral surface of the hose H is tightened with a tightening tool 26. The tightening tool 26 is formed in a truncated cone shape, and a linear notch 26a is formed from one end side of the hose tip side, and a linear notch 26b is formed from the other end side so as to be stretchable. Further, a claw portion 26c is formed on the inner periphery on the other end side, and the claw portion 26c bites into the hose H to prevent the hose H from coming off.
The tightening tool 26 fits the lock nut 27 to the tightening tool 26 and screwes the tightening tool screw portion 28 of the lock nut 27 and the lock nut screw portion 12e so that the claw portion 26c bites into the hose H. Is formed.
In addition, reinforcing ribs 12g in the rotating tube are radially provided at equal intervals on the inner peripheral surface of the hose fitting portion 12c of the rotating tube 10 in parallel to the axial direction. Thereby, durability of the rotary tube 10 can be improved.

The assembly method of the rotatable joint 1 for a pipe of the first embodiment configured as described above will be described below with reference to FIGS. FIG. 7 is a schematic view when the rotating tube is externally fitted to the proximal end fixed tube.
The O-ring 9 is fitted into the O-ring groove 8 of the base end fixed tube 2. Next, as shown in FIG. 7, when the rotary tube 10 is pushed inward from the distal end cylindrical portion 2 c side of the base end fixed tube 2, the locking claw portion 15 a is engaged with the locking annular protrusion 7 of the base end fixed tube 2. Touch the corner. Next, by pushing further inward, the engaging claw portion 15a is inclined with respect to the traveling direction, so that an outward force is applied to the engaging claw portion 15a, and as shown by the dotted line in FIG. The locking portion main body 15 warps outward and is pushed into the back. Next, by pushing further inward, as shown in FIG. 2, the locking claw 15 a is fitted into the locking annular groove 6, and the contact surface 15 a ″ is the locking annular groove of the locking annular protrusion 7. After being locked, it is bent and locked by the elastic force of the locking portion main body 15 against the pulling force in the direction of pulling out the rotary tube 10. The claw portion 15a enters the back of the locking annular groove portion 6 and the contact surface 15a "contacts widely, whereby the rotary tube 10 can be firmly locked to the proximal end fixed tube 2. Further, the rotating tube 10 can freely rotate because the contact surface 15a "of the locking claw portion 15a is slidable in the direction around the axis of the base end fixed tube 2.
Next, when the guide portion 23 of the cover body 21 shown in FIG. 6 is pushed together with the guide rail portion 16 of the rotary tube 10 and the guide reinforcing portion 24 is fitted into the guide insertion portion 19, As shown in FIG. 2, the cover body insertion protrusion 25 is locked to the annular step portion 13a of the cover body insertion flange 13, whereby the cover body 21 is firmly locked to the cover body insertion flange 13, and the cover The body 21 can be fitted on the rotary tube 10. At this time, the step portion 22 of the cover body 21 is fitted to the flange 11 of the rotary tube 10. As a result, the pulling force in the direction of pulling out the rotary tube 10 is bent by the elastic force of the locking portion body 15 so that the locking claw portion 15a enters the back of the locking annular groove 6 and the contact surface 15a "is widely applied. Accordingly, the rotary tube 10 can be firmly locked to the proximal end fixed tube 2. When a force is applied to pull the rotary tube 10 in the direction in which the rotary tube 10 is pulled out, the locking claw portion 15a is engaged. Although the locking portion main body 15 bends in the direction away from the locking annular groove 6, the locking prevention projection 15 b comes into contact with the cover body 21 to prevent the locking claw 15 a from being disconnected from the locking annular projection 7. Therefore, it is possible to prevent the rotary tube 10 from being detached from the base end fixed tube 2. Further, since the disengagement preventing projection 15b is provided, the latching claw portion 15a is formed into a ring for locking at the assembly stage. The position where the disengagement prevention projection 15b is originally fitted when there is insufficient locking to the groove 6 Since the cover body 21 to be assembled afterwards cannot be fitted outside, it is possible to distinguish the insufficient locking of the locking claw portion 15a, so that the workability is excellent.
Next, as shown in FIG. 2, after the lock nut 27 and the fastener 26 are externally fitted to the hose H in this order, the hose H is externally fitted to the hose fitting portion 12 c of the rotary tube 10, and then the fastener 26 is attached to the hose H The lock nut 27 is screwed onto the lock nut screwing portion 12e and the fastener 26 is fastened to the outer peripheral surface of the hose H. Thereby, it can prevent that the nail | claw part 26c of the fastener 26 bites into the hose H, and the hose H comes off.

As described above, since the rotatable joint for pipes in the first embodiment is configured, the following operation can be obtained.
(1) Since the locking portion main body, the locking claw portion, and the rotary tube are integrally formed, the number of parts can be reduced without requiring additional locking means as in the prior art.
(2) Since the locking part main body, the locking claw part, and the rotating tube are integrally formed, it is not necessary to separately incorporate the locking means as in the prior art, and the manufacturing and mounting man-hours can be reduced. .
(3) By simply inserting the rotating tube into the base end fixed tube, the locking claw portion is loosely fitted into the locking annular groove due to the elasticity of the locking portion body, so that the assembly workability is remarkably improved. Can be made.
(4) Since the locking portion main body is continuously provided on the flange, and further, the window reinforcing ribs constituting the frame portion of the locking portion window portion are continuously provided on both sides of the locking portion main body. The strength of the main body can be increased.
(5) Since the locking portion main body is formed inside the locking portion window portion, it is possible to prevent accidents that may occur during manufacture and assembly.
(6) By externally fitting the cover body to the locking portion main body, it is possible to prevent and protect the locking portion main body from being loaded from the outside.
(7) By locking the cover body insertion protrusion to the cover body insertion flange, the locking body can be protected by the cover body and the cover body can be prevented from falling off.
(8) When there is insufficient locking of the locking claw part of the locking part main body during assembly, the detachment prevention protrusion protrudes outward and the cover body cannot be properly fitted to the original fitting position. Since the worker can easily detect the lack of engagement between the proximal fixed tube and the rotating tube, the workability is excellent.
(9) By fitting the cover body to the locking part main body, even when the outward force is applied to the locking claw part when the rotary tube is pulled strongly in the pulling direction, the detachment prevention protruding part is Since it is regulated by the cover body wall, the locking claw portion does not come off from the locking annular protrusion, and the reliability of the degree of component coupling is excellent.
(10) Since the rotary tube is rotatable, twisting does not occur when a hose or the like is connected, and the workability is excellent.
(11) Since it is possible to rotate the rotating tube at the same time as rotating the cover body when it is desired to rotate in an arbitrary direction, it is excellent in convenience.

DESCRIPTION OF SYMBOLS 1 Rotating joint 2 for pipe | tubes in Embodiment 1 Base end fixed pipe 2a Base end cylinder part 2b Central cylinder part 2c Front end cylinder part 3 Connection means 4 Base end flange part 5 Annular rib 6 Annular groove part 7 Engagement ring Projection 8 O-ring groove 9 O-ring 10 Rotating tube 11 Flange 12a Tip tube portion insertion portion 12b Small diameter tube portion 12c Hose fitting portion 12d Fitting recess 12e Lock nut screwing portion 12e 'Screw portion 12f Reinforcement rib 12g Rotating tube reinforcing rib 13 Cover body insertion flange 13a Annular stepped portion 14 Locking portion window portions 14a, 14b Window reinforcing rib 15 Locking portion main body 15a Locking claw portion 15b Detachment preventing protrusion 15a 'Inclined surface 15a " Contact surface 16 Guide rail portion 17 Guide rail rib 18 Cover body holding rib 19 Guide insertion portion 20 Guide fitting portion 21 Cover body 22 Step portion 23 Guide portion 24 Guide reinforcing portion 25 Cover body insertion protrusion 26 Fasteners 26a, 26b Linear cutout portion 26c Claw 27 Lock nut 28 Fastener screwing portion 101 Water spray nozzle 102 Nozzle body 103 Connecting means H Hose D1 Outer diameter of locking annular groove D2 Outer diameter of the tip tube

Claims (4)

A proximal fixed tube formed in a substantially cylindrical shape and having a locking annular groove on the outer peripheral surface;
A rotary tube formed in a substantially cylindrical shape and rotatably fitted to the proximal end fixed tube;
A locking portion main body formed in the shape of a tongue on the peripheral surface of the rotating tube;
A locking claw portion protruding from the inside of the front end of the locking portion main body and locked in a locking manner in the locking annular groove portion;
A cover body that is formed in a substantially cylindrical shape and is externally fitted to the locking portion body;
A retaining means for preventing the cover body from coming off from the locking portion main body,
In addition, a rotatable joint for a pipe, wherein the retaining means is a cover body insertion protrusion projecting from one or both of the rotary pipe and the cover body. A proximal fixed tube formed in a substantially cylindrical shape and having a locking annular groove on the outer peripheral surface;
A rotary tube formed in a substantially cylindrical shape and rotatably fitted to the proximal end fixed tube;
A locking portion main body formed in the shape of a tongue on the peripheral surface of the rotating tube;
A locking claw portion protruding from the inside of the front end of the locking portion main body and locked in a locking manner in the locking annular groove portion;
A cover body that is formed in a substantially cylindrical shape and is externally fitted to the locking portion body;
When projecting on the outer side of the locking portion main body and the locking claw portion is not locked in the locking annular groove, the cover body comes into contact with the base end fixing tube. and the <br/> that a disengagement preventing protrusion for preventing the fitted around the rotary tube rotatably pipe characterized joint. The locking body is a tube for rotatable joint of claim 1, characterized in that it comprises a disengagement preventing protrusion protruding from the outside of the locking body. On either one of the outer peripheral wall of the rotating tube or the inner peripheral wall of the cover body, a concave groove-shaped guide rail portion extending in the axial direction is provided,
The rotatable joint for pipes according to any one of claims 1 to 3, further comprising a guide portion constituted by a protrusion or an axial protrusion.

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