HK1180029B - Member connector and spray nozzle unit using same - Google Patents

Description

Component joint and spray nozzle unit using the same

Technical Field

The present invention relates to a component joint for connecting two components to each other so as to allow relative rotation, and a spray nozzle unit in which a head and a nozzle holder are connected to each other so as to be able to rotate relative to each other using the component joint. The component joint system of the present invention refers to both a pipe joint and a coupling using a coupling nut (union nut).

Background

As conventional examples of pipe joints, there are pipe joints shown in patent documents 1 and 2 below. The pipe joint of patent document 1 is formed such that a sleeve (sleeve) is looped around the outer periphery of the front pipe, and the rear pipe and the front pipe are connected by anchoring them with a cover (corresponding to a coupling nut) screwed to the body. The cover is fixed to the body by a connecting pin to prevent the cover from loosening.

On the other hand, in the pipe joint of patent document 2, the adjusting joint is rotatably attached to the outer periphery of the end via balls, and the nozzle head (nozzle tip) is attached to the end of the adjusting joint using a cap nut. With such a configuration, the coupling nut does not loosen even if the pipe joint and the adjustment joint rotate relative to each other.

Patent document 3 discloses a lock structure of a container plug that can be used as a measure against loosening of a coupling nut. In this structure, ratchets that engage with each other are provided on the outer periphery of the neck portion of the container and the inner periphery of the container lid, and when the lid is rotated in the screwing direction, the lid-side teeth move on the guide surfaces of the neck-side teeth and ride over the neck-side teeth, and when the lid is rotated in the unscrewing direction, the lid-side teeth move on the driven surfaces of the neck-side teeth and ride over the neck-side teeth.

Patent document 1: japanese laid-open patent publication No. 10-110870

Patent document 2: japanese patent laid-open publication No. 2000-140710

Patent document 3: japanese patent laid-open publication No. 9-2502

As one of the spray nozzle units currently being developed by the present applicant, for example, a spray nozzle unit as shown in fig. 7 is required to prevent unscrewing of the coupling nut in this product.

The spray nozzle unit of fig. 7 is composed of a nozzle holder 11 connected to a supply pipe for a spray liquid and a head 13 held by the nozzle holder 11.

In the spray head 13, there are two, in total four sets of pipe connections 30 on each side, each pipe connection 30 having a coupling nut 3. The coupling nut 3 of one pipe joint 30 on each side is rotatably fitted to the outer periphery of one end side of the first elbow 15 and screwed to the nozzle holder 11. The coupling nut 3 of the other pipe joint 30 on each side is rotatably fitted to the outer periphery of the second bend 16 on one end side and screwed to the first bend 15.

The coupling nut 3 screwed to the nozzle holder 11 fastens the flange 6 provided on the outer periphery of the one end side of the first elbow 15. The other coupling nut 3 also fastens the flange 6 provided on the outer periphery of the one end side of the second elbow 16, whereby the first elbow 15 is connected to the nozzle holder 11, and further, the second elbow 16 is connected to the first elbow 15.

While maintaining this connection state, the first bend 15 is rotated by a predetermined angle with respect to the nozzle holder 11, and the second bend 16 is rotated by a predetermined angle with respect to the first bend 15.

The rotation of the first bend 15 and the second bend 16 in the spray nozzle unit described as an example is performed for the purpose of opening and closing the valve 14 disposed inside the pipe joint 30 and changing the position and orientation of the nozzle 12 fixed to the second bend 16, and by opening and closing the valve and switching the position and orientation of the nozzle by this method, the structure of the valve and the structure of the relative rotation can be simplified.

However, since the flange 6 formed on the first bend 15 and the second bend 16 is fastened by the coupling nut 3 and strong friction is generated between the flange 6 and the coupling nut 30, when the first bend 15 is rotated in the loosening direction of the coupling nut 3 with respect to the nozzle holder 11, the coupling nut 3 is rotated (rotated together) together and loosened. The same applies when rotating the second bend 16 relative to the first bend 15.

As a method for preventing this loosening, when the coupling nut is mechanically fixed to the non-rotating member using the connecting pin as described in patent document 1, the fixing of the coupling nut and the release of the fixing become complicated. Further, it is also conceivable that the small coupling pin is lost when removed.

Further, in the method of patent document 2, it is necessary to provide a coupling portion that allows relative rotation at a position different from the coupling portion of the coupling nut, which leads to a complicated and large-sized structure of the coupling portion.

Further, in the anti-loosening structure of patent document 3, since it is necessary to cause the teeth on the cap side to ride over the teeth on the neck side by a force for rotating the cap in the loosening direction, it is difficult to ensure high reliability in the rotation stopping of the coupling nut which receives a large rotational force. Further, there is a fear that the teeth on the cap side and the teeth on the neck side are worn or crushed by mutual friction, and the durability thereof is not assured.

Disclosure of Invention

The present invention addresses the problem of preventing joint nut co-rotation with high reliability without complicating fixation and release of the nut and without causing an increase in size or deterioration in durability of a connection portion, in a component joint (pipe joint or coupling) in which a large force that co-rotates a joint nut that connects two members is inevitably transmitted to the joint nut when the two members are relatively rotated.

In order to solve the above problem, according to the present invention, a component joint includes: a first member provided with a male screw on an outer periphery of a connection end side; a second member provided with a flange on an outer periphery of a connection end side; and a coupling nut rotatably fitted to an outer periphery of the second member and screwed with the male screw, the flange being sandwiched between the coupling nut and the first member or another member held by the first member by the coupling nut, and the first member and the second member being connected by the coupling nut, wherein a protrusion having a guide surface and a driven surface inclined in opposite directions is provided on an outer periphery near a male screw forming portion of the first member, a locking ring having an inner diameter larger than an outer diameter of a portion of the first member where the protrusion is formed is rotatably attached to a distal end portion of an opening of the coupling nut, a locking claw projecting inward is provided on an inner periphery of the locking ring, and the locking claw is pressed by the protrusion to be elastically deformed when the locking ring is rotated, and a holding piece for engaging with the locking claw is provided on the coupling nut at a position on the outer diameter side of the projection, and a distal end side of the locking claw faces the driven surface at a position where the coupling nut is screwed into the screw-in end point, and the distal end side of the locking claw is held between the holding piece and the driven surface when the coupling nut is rotated in the unscrewing direction alone from the position.

In the component joint, it is preferable that the locking ring is formed of a high-strength resin, particularly polyacetal called engineering plastic. The coupling nut may be formed of metal or resin.

Further, it is preferable that the projection, the locking claw, and the clamping piece are provided in plurality at a predetermined pitch in a circumferential direction, the number of the locking claw and the clamping piece is larger than the number of the projection, and the clamping piece is disposed between the locking claws in a state of being fitted with play, and it is further preferable that an inclination angle of the driven surface is set larger than an inclination angle of the guide surface, and the locking claw is inclined in a direction parallel to the driven surface at a position where the locking claw is in contact with the driven surface.

The component joint can be provided as a pipe joint and connects a first component and a second component (both pipes) with a coupling nut. Also, it is possible to provide as a coupling and connect the first member and the second member (each being a solid or hollow shaft) with a coupling nut.

The present invention also provides a spray nozzle unit having improved reliability of connection of a head to a nozzle holder using the above-described component joint.

The spray nozzle unit is configured to include: a nozzle holder having an internal flow path; a head having a nozzle for ejecting liquid at a distal end thereof; a pipe joint connecting the head to the nozzle holder; and a valve disposed inside a connecting portion between the nozzle holder and the head, the pipe joint being the component joint of the present invention. And a coupling nut of the component joint is screwed into a male screw provided on an outer periphery of an end portion of the nozzle holder, a flange provided on a connection-side end portion of the head is sandwiched between the coupling nut and the nozzle holder or a member held by the nozzle holder, a projection of the component joint having the guide surface and the driven surface is provided adjacent to the male screw and on an outer periphery of the nozzle holder, and when the coupling nut of the component joint is rotated in an unscrewing direction alone, a locking claw of a locking ring provided on the component joint is sandwiched between a clamping piece provided on the coupling nut and the driven surface of the projection.

For the spray nozzle unit, the head includes: a first elbow connected to the nozzle holder and a second elbow connected to the first elbow, wherein the connection of the first elbow to the nozzle holder and the connection of the second elbow to the first elbow are performed using the component joint of the present invention.

The valve is assembled in each of the connection portions of the joint members, that is, the connection portion between the nozzle holder and the first bend, and the connection portion between the first bend and the second bend, and the valve is opened and closed and the position and the orientation of the nozzle provided in the second bend are switched by the relative rotation between the nozzle holder and the first bend, and the relative rotation between the first bend and the second bend, whereby the problem of the unscrewing due to the joint rotation of the coupling nut can be solved in both the connection portion between the first bend and the nozzle holder and the connection portion between the second bend and the first bend.

In the component joint according to the present invention, when the coupling nut is rotated in the tightening direction, the locking claw is pressed by the clamping piece and the securing ring follows the rotation, and the locking claw is pressed by the projection (guide surface) provided on the outer periphery of the first component and elastically deformed so as to pass over the projection. Therefore, the fastening of the coupling nut can be performed without limitation.

On the other hand, when the coupling nut is screwed to the fastening end point, the distal end side of the locking claw is opposed to the driven surface in this position. Further, when the coupling nut is to be rotated in the loosening direction alone from the position, the clamping piece clamps the locking claw between the locking claw and the driven surface.

The stronger the clamping is the greater the force of the coupling nut alone rotating in the unscrewing direction. Therefore, when the coupling nut is to be rotated in the loosening direction alone, the locking ring cannot be rotated, and the coupling nut can be reliably prevented from being rotated in the loosening direction by the locking ring.

When the locking ring is rotated in the loosening direction of the coupling nut, the locking claw slides on the driven surface and elastically deforms to pass over the projection because no force is generated to be gripped by the gripping piece. Further, the locking claw pushes the clamping piece at the rear in the tightening direction, whereby the coupling nut is also rotated together, and the coupling nut can be removed.

In this way, the component joint of the present invention can prevent the coupling nut from rotating in the loosening direction without using the stopper pin, and the fixing and releasing of the nut do not become complicated.

The securing ring may be a small member fitted to the outer periphery of the distal end of the coupling nut, and the size and complexity of the connecting portion due to the joint are not increased.

Further, since the locking claws of the locking ring are elastically deformable and the locking claws move away while being elastically deformed and go over the projections, abrasion or crushing of the locking claws or the projections is less likely to occur, and sufficient durability can be ensured.

Further, the parts of the coupling nut and the securing ring formed of resin can be manufactured by a molding method with high productivity.

Further, the projection, the locking claw, and the clamping piece are provided with a plurality of members, so that the loosening of the coupling nut can be prevented at a plurality of positions, and the reliability of the loosening prevention is high. Further, the load of the locking claw and the clamping piece is dispersed, and the durability is further improved.

In the case of a member in which the inclination angle of the driven surface of the projection is set larger than the inclination angle of the guide surface and the locking claw is inclined in a direction parallel to the driven surface at a position where the locking claw contacts the driven surface, the rotation resistance of the locking ring can be suppressed to be low and the gripping stability of the locking claw by the driven surface and the gripping piece can be improved.

In addition, the spray nozzle unit of the present invention does not cause the loosening of the coupling nut connecting the spray head and the nozzle holder. Therefore, the valve can be opened and closed and the position and direction of the nozzle can be switched by rotating the head and the nozzle holder relative to each other, and the valve and the relative rotation structure can be simplified.

Drawings

Fig. 1 is a cross-sectional view showing an example of a component joint of the present invention.

Fig. 2 is an exploded perspective view of the component joint of fig. 1.

In fig. 3, (a) and (b) are explanatory views of operations of fastening the coupling nut, (c) is an explanatory view of operations of preventing the coupling nut from loosening, and (d) is an explanatory view of operations of releasing the loosening prevention of the coupling nut.

Fig. 4 is a partially sectional front view showing an example of the spray nozzle unit of the present invention.

Fig. 5 is a top view of the spray nozzle unit of fig. 4.

Fig. 6 is a side view of the spray nozzle unit of fig. 4.

Fig. 7 is a front view, partially in section, showing a spray nozzle unit before modification.

Detailed Description

Next, an embodiment of the component joint and the spray nozzle unit according to the present invention will be described with reference to fig. 1 to 6 of the drawings. Fig. 1 to 3 show the basic structure of the component joint of the present invention. The illustrated component joint 10 constitutes a pipe joint, and has a first component 1, a second component 2, a coupling nut 3, and a locking ring 4. These parts are all made of a high-strength resin (e.g., polyacetal) by molding.

The first member 1 and the second member 2 are pipes to be connected. The connection of the first and second members 1, 2 is performed by means of a coupling nut 3. The outer peripheries of the coupling nut 3 and the securing ring 4 are preferably formed with non-slip projections and depressions.

A male screw 5 is provided on the outer periphery of the connection end side of the first member 1, and the coupling nut 3 is screwed to the male screw 5. The coupling nut 3 is fitted to the outer periphery of the second member 2, and a flange 6 provided on the outer periphery of the second member 2 on the connection end side is sandwiched between the end wall 3a and the opposite portion by the end wall 3a.

The illustrated component joint 10 sandwiches the flange 6 between the end wall 3a of the coupling nut 3 and the connection end of the first component 1, but when the connection portion is provided in another component held by the first component 1, the flange 6 may be sandwiched between the end wall 3a and the other component.

A plurality of (four in the figure) projections 7 having guide surfaces 7a and driven surfaces 7b inclined in opposite directions are provided at regular intervals in the circumferential direction on the outer periphery of the first member 1 near the male screw forming portion on the connection end side. The inclination angle (the elevation angle with respect to the outer peripheral surface of the first member) of the guide surface 7a of the projection 7 is small, and the inclination angle of the driven surface 7b is larger than the inclination angle of the guide surface 7a (in the illustrated component joint 10, the inclination angle of the guide surface 7a is about 20 °, and the inclination angle of the driven surface 7b is about 45 °).

The coupling nut 3 has a clamping piece 8 projecting in the axial direction at the end (the side opposite to the side where the end wall 3a is present). The holding pieces 8 are provided at a constant pitch in the circumferential direction, and the number thereof is the same as the number of locking claws 9 of a locking ring to be described later, and as shown in fig. 3, the holding pieces 8 are arranged between the locking claws 9 in a state of being loosely fitted.

The inner diameter of the portion of the locking ring 4 having no locking claw is larger than the outer diameter of the projection 7 forming portion of the first member 1, and the locking ring 4 is rotatably attached to the outer periphery of the open distal end small diameter portion 3b of the coupling nut 3. The locking ring 4 is coupled to the coupling nut 3 by inserting a minute projection 4a provided on the inner peripheral surface into an annular groove 3c provided on the outer periphery of the distal end small diameter portion 3b of the coupling nut 3.

A plurality of locking claws 9 protruding inward are provided at regular intervals in the circumferential direction on the inner periphery of the locking ring 4. The locking claw 9 is elastically deformable and inclined in a preferred direction, that is, in a direction parallel to the driven surface 7b of the projection 7 at a position in contact with the driven surface 7b (see fig. 3(c) and (d)).

The tip (free end) of the locking claw 9 is located on a circle having substantially the same diameter as the outer diameter of the portion without the projection in the projection forming portion of the first member 1. Thus, the locking claw 9 is in sliding contact with the projection 7 while passing the position of the projection 7.

When the coupling nut 3 is to be rotated in the unscrewing direction alone, the locking ring 4 blocks this rotation by blocking the clamping tabs 8 with the locking claws 9. Although this object can be achieved even when the number of the locking claws 9 is one, when a plurality of locking claws 9 are provided at a small pitch as shown in the drawing, the locking of the coupling nut 3 can be performed at a plurality of positions, and the reliability of the locking is improved.

Further, the load of the locking claw 9 and the clamping piece 8 is dispersed, and the durability of the joint is also improved. Further, when the number of the locking claws 9 and the gripping pieces 8 is increased, the distal end side of the locking claw 9 faces the driven surface 7b at a position close to the driven surface 7b when the coupling nut 3 is screwed into the stationary blade end point, and therefore the positional accuracy of the projection 7, the gripping pieces 8, and the locking claw 9 at the coupling nut screwing end point is high.

In the component joint 10 configured as described above, when the coupling nut 3 having the clamping piece 8 is screwed to the male screw (5 in fig. 1 and 2) of the first component 1 and rotated in the tightening direction (clockwise direction indicated by an arrow) as shown in fig. 3a, the locking claw 9 is pressed by the clamping piece 8 and the locking ring 4 follows the rotation. At this time, the lock claw 9 is pushed by the protrusion 7, elastically deformed, and retreated to the outer diameter side, and slides on the guide surface 7a to get over the protrusion 7.

Thereby, at the end of screwing of the coupling nut 3, the tip of the locking claw 9 is moved to a position opposed to the driven surface 7b of the projection 7. Thereafter, when the coupling nut 3 is to be rotated in the unscrewing direction alone, as shown in fig. 3(c), the distal end side of the locking claw 9 is sandwiched between the gripping piece 8 and the driven surface 7b of the projection 7. Therefore, the locking ring 4 cannot be rotated, and the locking claws 9 function as stoppers for blocking the clamping pieces 8, thereby preventing the coupling nut 3 from being rotated in the loosening direction.

The greater the force with which the coupling nut 3 is rotated in the unscrewing direction alone, the more firmly the clamping of the clamping piece 8 and the follower surface 7b on the locking pawl 9. Therefore, even if a strong rotational force is transmitted from the second member 2 to the coupling nut 3 due to the relative rotation of the first member 1 and the second member 2, the coupling nut 3 is stably held at the fastening end point. Strictly speaking, a rotation in the unscrewing direction takes place before the gap between the clamping piece 8 and the locking pawl 9 is absorbed, but this rotation is a negligible amount and is not considered to be unscrewing.

When the fastened coupling nut 3 is removed, the securing ring 4 is rotated in the loosening direction of the coupling nut 3 as shown in fig. 3 (d). At this time, since the rotational force in the unscrewing direction is not applied to the coupling nut 3, the locking claw 9 is not clamped by the clamping piece 8.

Therefore, the locking claws 9 can slide on the driven surfaces 7b while elastically deforming to get over the protrusions 7, and the coupling nut 3 can be removed from the first member 1 by continuing to rotate the locking ring 4 in the loosening direction following the rotation, thereby releasing the screwing of the coupling nut 3 and the male screw 5.

Next, fig. 4 to 6 show an example of the spray nozzle unit of the present invention. The spray nozzle unit 20 includes: a nozzle holder 11 having an internal flow path 11 a; a head 13 having a nozzle 12 for ejecting liquid at a distal end thereof; a part joint 10 for connecting the head 13 to the nozzle holder 11; and a valve 14. The valve 14 is made of polyamide resin (trade name: nylon), the bamboo-shoot-shaped pipe joint having the flange 6 (considered as a part of a first elbow and a second elbow described later) is made of metal such as brass, and both of them and the parts other than the O-ring for sealing the outer periphery of the valve are polyacetal molded articles.

The head 13 has a first elbow 15 connected to the nozzle holder 11 and a second elbow 16 connected to the first elbow using the component joint 10, and the nozzle 12 is attached to one end of the second elbow 16.

The joint 10, which is a component used in both of the joints, is a pipe joint of the present invention as described above.

As the valve 14, a valve 14 attached to a connection portion between the nozzle holder 11 and the first elbow 15 and a valve 14 attached to a connection portion between the first elbow 15 and the second elbow 16 are provided.

The nozzle holder 11 is connected to a liquid supply path (not shown). The outer periphery of the end portion of the nozzle holder 11 is provided with the male screw 5 and the above-described projection 7 located near the root of the male screw 5, and the coupling nut 3 of the component joint 10 is screwed to the male screw 5.

The coupling nut 3 screwed to the male screw 5 of the nozzle holder 11 is rotatably fitted to the outer periphery of the connection end side of the first bend 15 (separately machined and press-fitted to the outer periphery of the flanged sleeve of the first bend 15). The coupling nut 3 sandwiches the flange 6 provided on the outer periphery of the end portion (pipe end) of the first elbow 15 between the end wall 3a and the flange on the outer periphery of the valve 14 opposite to the end wall 3a, whereby the first elbow 15 is connected to the nozzle holder 11.

The male screw 5 and the protrusion 7 are also provided on the outer periphery of the end portion of the first bend 15, and the coupling nut 3 is rotatably fitted to the outer periphery of the connection end side of the second bend 16 in the same manner as described above, and the coupling nut 3 is screwed to the male screw 5 of the first bend 15. Thereby, the flange 6 provided on the outer periphery of the end portion of the second elbow 16 is sandwiched between the end wall 3a of the coupling nut 3 and the flange opposite to the end wall 3a on the outer periphery of the valve 14, thereby connecting the second elbow 16 to the first elbow 15.

In this way, by connecting the first elbow 15 to the nozzle holder 11 and connecting the second elbow 16 to the first elbow 15 using the component joint 10 of the present invention, relative rotation of the first elbow 15 and the nozzle holder 11 and relative rotation of the second elbow 16 and the first elbow 15 can be performed without loosening the coupling nut 3.

The relative rotation is used to open and close the valve 14 and switch the position and orientation of the nozzle 12 in the illustrated spray nozzle unit 20.

In the valve 14, a plurality of connection ports 18 are provided at circumferentially displaced positions, and the connection ports 18 communicate the internal passage 17 with passage outlets of the first bend 15 and the second bend 16, and the connection ports 18 at different positions communicate the internal passage 17 with passage outlets of the first bend 15 and the second bend 16 by relative rotation of the first bend 15 and the nozzle holder 11 or relative rotation of the second bend 16 and the first bend 15, thereby switching the connection position and the connection state.

Accordingly, the position and orientation of the nozzle 12 are switched. By moving the passage outlets of the first bend 15 and the second bend 16 to a position where there is no connection port 18, the valve 14 can be closed to stop the spraying.

Further, although the spray nozzle unit 20 illustrated is provided with two sets of the nozzles 12, the first bend 15, and the second bend 16, respectively, and is arranged in a centrosymmetric manner, the spray nozzle unit of the present invention may be provided with one set of the nozzles 12, the first bend 15, and the second bend 16, respectively, or the second bend 16 may be omitted and the nozzles 12 may be attached to the first bend 15.

Further, the component joint 10 of the present invention may be used when two shafts are connected to each other so as to be relatively rotatable. For example, when an arm is configured by bending one axis and a device such as a lighting device, a mirror, or a camera is attached to the tip of the arm, the position or orientation of the device at the tip of the arm can be changed by relatively rotating the bent arm with respect to the other axis as a seat.

In such an application, when a shaft connected by a coupling including a coupling nut is relatively rotated, the coupling nut is loosened, but the loosening can be eliminated by using the component joint of the present invention.

Description of the reference symbols

A first component; a second component; coupling a nut; an end wall; a distal small diameter portion; an annular groove; locking ring; a micro protrusion; external threads; a flange; a protrusion; a guide surface; a clamping sheet; 9.. locking the jaws; a component joint; a nozzle mount; an internal flow path; a nozzle; a showerhead; a valve; a first elbow; a second elbow; an internal channel; a connector; a spray nozzle unit.

Claims (7)

1. A component joint, the component joint having: a first member (1), wherein the outer periphery of the first member (1) on the connection end side is provided with a male screw (5); a second member (2), the second member (2) being provided with a flange (6) on the outer periphery of the connection end side; and a coupling nut (3) rotatably fitted to the outer periphery of the second member (2) and screwed with the male screw (5), the flange (6) being sandwiched between the coupling nut (3) and the first member (1) or another member held by the first member by the coupling nut (3) to connect the first member (1) and the second member (2),

the above-described component joint is characterized in that,

a protrusion (7) is provided on the outer periphery of the first member (1) near the male screw forming portion, the protrusion (7) having a guide surface (7a) and a driven surface (7b) inclined in opposite directions,

a locking ring (4) is rotatably attached to a distal end portion of the opening of the coupling nut (3), an inner diameter of the locking ring (4) is larger than an outer diameter of a portion of the first member (1) where the projection is formed,

a locking claw (9) protruding inward is provided on the inner periphery of the locking ring (4), and when the locking ring is rotated, the locking claw (9) is pushed by the protrusion (7) and elastically deformed so that the locking claw goes over the protrusion (7),

furthermore, a clamping piece (8) which is engaged with the locking claw (9) is arranged on the outer diameter side of the projection (7) of the coupling nut (3),

when the coupling nut (3) is screwed into the screw-in end position, the distal end side of the locking claw (9) faces the driven surface (7b), and when the coupling nut (3) is rotated in the unscrewing direction alone from this position, the distal end side of the locking claw (9) is sandwiched between the holding piece (8) and the driven surface (7 b).

2. The component joint according to claim 1,

the locking ring (4) is formed of a high-strength resin.

3. Component joint according to claim 1 or 2,

the projections (7), the locking claws (9), and the holding pieces (8) are provided in plurality at a constant pitch in the circumferential direction, the number of the locking claws (9) and the holding pieces (8) is larger than the number of the projections (7), and the holding pieces (8) are arranged between the locking claws (9) in a state of being fitted with play.

4. Component joint according to claim 1 or 2,

the inclination angle of the driven surface (7b) is set to be larger than the inclination angle of the guide surface (7a), and the locking claw (9) is inclined in a direction parallel to the driven surface (7b) at a position where the locking claw contacts the driven surface (7 b).

5. The component joint according to claim 3,

the inclination angle of the driven surface (7b) is set to be larger than the inclination angle of the guide surface (7a), and the locking claw (9) is inclined in a direction parallel to the driven surface (7b) at a position where the locking claw contacts the driven surface (7 b).

6. A spray nozzle unit, characterized in that,

the spray nozzle unit includes: a nozzle holder (11) provided with an internal flow path; a head (13) having a nozzle (12) for ejecting liquid at a distal end thereof; the component joint (10) as claimed in any of claims 1 to 5, the component joint (10) connecting the spray head (13) to the nozzle holder (11); and a valve (14) disposed inside a connecting portion between the nozzle holder (11) and the head (13),

a coupling nut (3) of the component joint (10) is screwed into a male screw (5) provided on the outer periphery of an end portion of the nozzle holder (11), a flange (6) provided on a connection-side end portion of the head (13) is sandwiched between the coupling nut (3) and the nozzle holder (11) or a component held by the nozzle holder,

the projection (7) of the member joint (10) having the guide surface (7a) and the driven surface (7b) is provided near the male screw (5) and on the outer periphery of the nozzle holder (11),

when the coupling nut (3) of the component joint (10) is rotated in the loosening direction alone, the locking claw (9) of the locking ring (4) provided in the component joint (10) is sandwiched between the holding piece (8) provided in the coupling nut (3) and the protruding driven surface (7 b).

7. The spray nozzle unit of claim 6,

the head (13) includes: a first elbow (15) connected to the nozzle holder (11), and a second elbow (16) connected to the first elbow (15),

connecting the first elbow (15) to the nozzle holder (11) and connecting the second elbow (16) to the first elbow (15) by using the component joint (10) according to any one of claims 1 to 5,

further, the valve (14) is assembled to each of a connection portion between the nozzle holder (11) and the first elbow (15) and a connection portion between the first elbow (15) and the second elbow (16),

the valve (14) is opened and closed and the position and the direction of the nozzle (12) provided in the second bend (16) are switched by the relative rotation of the nozzle holder (11) and the first bend (15) and the relative rotation of the first bend (15) and the second bend (16).