JP6129445B1 - Member joint and spray nozzle unit using the same - Google Patents

Abstract

A lock ring (24) is attached to the outer periphery of the union nut (23) so that relative rotation is not possible and axial relative movement is not possible, and a cantilever spring ring (24c) provided on the lock ring has a first slope with a reverse slope. (S1) and a second slope (S2) intersecting at an obtuse angle, a chevron-shaped lock portion (24g) is provided on the inner peripheral side at a constant pitch in the circumferential direction, and the male screw (14) provided on the connection partner member At least one engagement protrusion (25) with which the lock part (24g) engages is provided on the outer periphery on the base end side. When the union nut (23) rotates in the tightening direction, the lock part (24g) is engaged with the engagement protrusion ( When the union nut (23) rotates in the loosening direction, the lock portion (24g) comes into contact with the second cam surface (25b) of the engaging protrusion (25). Union nut (23 Slack has to be prevented. The union nut (23) can be replaced with a bottomed cylindrical cap (26).

Description

  The present invention relates to a member joint for screwing a union nut or a cap nut so as to prevent loosening with respect to a male screw at a pipe end, more specifically, while being able to stably prevent loosening at the screwing end point. Further, the present invention relates to a member joint that can be easily released from a screw, and a spray nozzle unit for spraying liquid that uses the joint to connect a nozzle to a nozzle holder.

  The applicant of the present invention has developed and commercialized a joint that connects two members using a union nut and can reliably prevent the union nut from rotating together due to the relative rotation of the two members (Patent Document 1 below). reference).

  Co-rotation of the union nut due to the relative rotation of the two members causes loosening of the tightening (connection by the nut).

  For example, in the cart-type liquid spraying apparatus as shown in FIG. 11, a method of efficiently spraying medicine or the like by attaching a large number of the spray nozzle units 1A described above to the boom 51 attached to the cart 50 is adopted. ing.

  The spray nozzle unit 1A shown in FIG. 11 includes a nozzle holder 10A attached to the boom 51 and a nozzle head 20A connected to the nozzle holder.

  The nozzle head is a combination of a union nut that is screwed into the nozzle holder and a nozzle that is fastened with the union nut and fixed to the nozzle holder.

  In such a liquid spraying device, the tightening of the nozzle by the union nut is loosened due to vibration during use, and the nozzle rotates due to the loosening, and the spraying direction changes to an unintended direction and uniform spraying may not be performed. is there.

  Therefore, in the member joint of Patent Document 1, a lock ring is rotatably attached to the outer periphery of the union nut, and the union nut screwed into the male screw of the nozzle holder of the connection partner is independent of the nozzle holder in the loosening direction of the screw. When trying to rotate, the lock claw provided on the lock ring is sandwiched between the protrusion provided on the nozzle holder and the clamping piece provided on the union nut.

  The lock ring is prevented from rotating by the pinching of the lock claw by the protrusion and the pinching piece, and the rotation of the union nut in the loosening direction is surely prevented by the lock ring which cannot be rotated.

Japanese Patent No. 4917190

  In the member joint of Patent Document 1, when the union nut tries to rotate in the loosening direction, the lock claw provided on the lock ring is sandwiched between the protrusion provided on the nozzle holder and the holding piece provided on the union nut. Due to the structure, the locking ring is prevented from coming loose.

  However, when releasing the tightening of the union nut, the lock ring is rotated alone in the tightening direction of the union nut, and the relative position of the union nut and the lock ring is fixed at the position where the lock claw hits the holding piece, It is necessary to maintain this state and rotate the union nut and the lock ring in the loosening direction at the same time, and there are some cases where the operability is not necessarily good.

  In the liquid spraying device, the nozzle of the nozzle head is replaced with one having a nozzle having a different shape, or the direction of the nozzle is switched. In this case, the nozzle head is temporarily loosened. There is a need.

  If it is a liquid spraying device with a low frequency of nozzle replacement and orientation change, the member joints of Patent Document 1 may be used, but as shown in FIG. With respect to the attached liquid spraying device, in particular, a device that frequently changes nozzles and changes the direction of jetting, it is advantageous to be able to release the nozzle head 20A more easily and quickly than tightening.

  The member joint of Patent Document 1 has a surface that cannot be said to have a sufficiently simplified structure.

  Therefore, the present invention provides a member joint with a simple structure that can be stably prevented from loosening at the union end point of the union nut or cap nut, and at the same time, the union nut or cap nut can be easily loosened, and An object of the present invention is to provide a spray nozzle unit for spraying a liquid in which a nozzle head is connected to a nozzle holder using the member joint.

  In order to solve the above-described problems, in the present invention, a member joint including a union nut and a connection partner member having a male screw at an end, and screwing the union nut to a male screw of the connection partner member, There is a lock ring that is mounted on the outer periphery of the screwed tip side of the union nut so that it cannot be rotated relative to the axial direction and cannot be moved in the axial direction. An inner flange that protrudes radially inward from the inner diameter of the outer ring, and a cantilevered spring ring that extends from the inner end of the inner flange in the direction away from the union nut. There is a gap between the inner peripheral surface of the outer ring and the outer peripheral surface of the spring ring, which allows the diameter of the spring ring to be expanded by elastic deformation. In the circumferential direction, the first inclined surface having a reverse slope and the second inclined surface having a larger inclination angle than the first inclined surface intersect with the obtuse angle and project inward in the radial direction toward the inner circumferential side. The connection mating member has at least one engagement protrusion projecting radially outward from a circle inscribed in each of the lock portions engaged with the lock portion on an outer periphery of the base end side of the male screw. The engaging protrusion includes a first cam surface having a small inclination angle that the lock portion rides when the union nut rotates in a tightening direction, and the lock portion when the union nut rotates in a loosening direction. The second cam surface having a larger inclination angle than the first cam surface with which the abuts.

  The lock ring is preferably formed of a resin such as polyacetal. Similarly, the union nut and the nozzle holder are preferably formed of a resin such as polyacetal.

  Further, the member joint preferably has an inclination angle of the second inclined surface of the spring ring larger than an inclination angle of the first inclined surface, and the inclination angle of the first inclined surface is set to be equal to that of the second cam surface. Those which are several degrees smaller than the inclination angle are preferred.

  The present invention includes a nozzle holder of a connection partner having an internal flow path, and a nozzle head to be combined with the nozzle holder. The nozzle head includes a nozzle having a nozzle hole and a member joint that connects the nozzle to the nozzle holder. The member joint comprising a union nut and a spring ring is used as the member joint, and the nozzle is fastened to the union nut threadedly engaged with the male screw at the tip of the nozzle holder, and the tip of the nozzle holder Also provided is a spray nozzle unit for spraying a liquid fixed to the container.

  The spray nozzle unit may incorporate a filter that allows liquid ejected from the nozzle to pass through the nozzle holder.

  The member joint of this invention can also consider the said union nut replaced with the bottomed cylindrical cap (a kind of cap nut) which has an internal thread. The member joint using the bottomed cylindrical cap cannot be used for the application of connecting the nozzle of the spray nozzle unit to the nozzle holder, but can be used for the application of closing the end of the pipe line with the cap. it can.

  In addition, the member joint including the union nut includes, for example, a first pipe joint that fixes the nozzle holder to a boom or the like, a second pipe joint that is connected to the first pipe joint in a liquid-tight and relatively rotatable manner, A member including a union nut for both the connection of the second pipe joint to the first pipe joint and the connection of the nozzle to the third pipe joint with a third pipe joint that is fitted to the second pipe joint so as not to rotate relative to each other. It can also be used when using a joint.

  It can also be used when a diaphragm valve for opening and closing a pipe incorporated in the middle of the pipe is attached to the first pipe joint of the valve holder using a member joint including a union nut.

  In the member joint according to the present invention, when a union nut or cap to which a lock ring is attached is screwed into a male thread of a connection partner member and tightened, the lock portion of the spring ring rides on an engagement protrusion provided on the connection counterpart member. .

  Since the lock portion is brought into contact with the first cam surface of the engagement protrusion having a small inclination angle, the lock portion can get over the engagement protrusion without applying a large tightening force. The tightening is smooth without requiring great force.

  On the other hand, when the union nut or the cap is subjected to vibration or the like, the second inclined surface of the lock portion provided on the lock ring engages with the second cam surface of the engagement protrusion provided on the connection partner member, whereby the lock ring Prevents loosening of union nuts and caps fitted with.

  The union nut or cap screwed into the male thread of the connecting member is subjected to a force to rotate (reverse) in the loosening direction due to the influence of the screw lead.

  In addition, the male thread of the connection partner member is made of resin, and the union nut and cap are also made of resin. .

  The resultant force of the two forces acts on the contact portion between the second cam surface of the engagement protrusion and the second inclined surface of the spring ring, and the second inclined surface of the lock portion acts on the second cam surface of the engagement protrusion. Pressed.

  When the diameter of the spring ring due to elastic deformation is maintained at a position where the lock portion is in contact with the engagement protrusion, the elastic restoring force of the spring ring is also pressed against the second cam surface of the second inclined surface. Added to the force, thereby adding resistance to the loose rotation of the lock ring.

  The resistance to the rotation in the loosening direction increases as the union nut is tightened, and the frictional force and elastic restoring force of the screw fitting portion increase. Therefore, unless a force that overcomes the resistance is applied, the lock ring cannot rotate over the engaging protrusion.

  Since the union nut or cap is mounted with its lock ring so as not to rotate relative to the union nut or cap, the anti-rotation by the lock ring is sustained and the rotation in the loosening direction does not occur as long as it receives vibration.

  The lock ring also rotates with the union nut and cap. Therefore, the union nut or cap can be easily released by simply releasing the union nut or cap in the direction of loosening by applying a force superior to rotational resistance and releasing the engagement of the lock portion with the engagement protrusion. Can do.

  The lock ring is molded individually and integrated with a union nut and a cap. The reason for doing so is as follows.

  That is, the union nut and the cap have a female screw that is screwed into the male screw. When the female screw is molded with a mold using a molten resin or the like as a material, it is necessary to rotate and remove the female screw molding portion of the mold when the mold is removed.

  By separately processing and attaching a lock ring having a spring ring with a wavy inner surface, it is not impossible to rotate and remove the female thread forming portion of the mold. Thereby, it is possible to provide a spring ring having a cantilevered support structure and having a wavy inner surface.

  In addition, the lock ring elastically deforms when the lock portion of the spring ring gets over the engagement protrusion, but if the lock ring is independent of the union nut or cap, the union nut or The cap does not elastically deform.

  Therefore, the screwed state of the union nut and the cap with respect to the male screw of the connection partner member does not become unstable.

  The spring ring of the lock ring is allowed to expand due to elastic deformation by providing a gap on the outer periphery, so that the lock portion of the spring ring can get over the engagement protrusion.

  Further, since the inclination angle of the first cam surface of the engagement protrusion is smaller than the inclination angle of the second cam surface, the lock portion of the spring ring is engaged when the union nut or the cap is rotated in the tightening direction. The protrusions can be overcome smoothly and tightening can be performed easily without any trouble.

  In addition, the lock ring formed of resin can be provided with a spring ring that is easily elastically deformed by utilizing the characteristics of the resin.

  Furthermore, when the inclination angle of the first inclined surface is several degrees smaller than the inclination angle of the first cam surface, the contact of the lock portion with the first cam surface is close to the line contact, and the union nut or cap The frictional resistance when rotating in the tightening direction is reduced, and the tightening operation can be performed with a smaller force.

It is sectional drawing which shows an example of the member coupling and spray nozzle unit of this invention. It is a disassembled perspective view of the member coupling and spray nozzle unit of FIG. It is the perspective view which looked at the lock ring provided in the member coupling of Drawing 1 from the back side. It is an expanded sectional view along the IV-IV line of FIG. It is sectional drawing which shows the relationship between the lock | rock part of a lock ring and the protrusion for engagement when rotating a union nut in a clamping direction. It is sectional drawing which shows the relationship between the lock | rock part of a lock ring and the protrusion for engagement when rotating a union nut in a loosening direction. It is sectional drawing which shows the other example of the spray nozzle unit of this invention. It is a top view of the spray nozzle unit of FIG. It is sectional drawing which shows the further another example of the spray nozzle unit of this invention. It is sectional drawing which shows the other example of the member coupling of this invention. It is a partially broken side view of the further another example of the spray nozzle unit of this invention. It is a front view which shows an example of a cart type liquid spraying apparatus.

  Embodiments of the member joint of the present invention will be described below with reference to FIGS. 1 to 10 of the attached drawings. 1 to 4 show an example of the spray nozzle unit of the present invention.

  The illustrated spray nozzle unit 1 is configured by combining a nozzle holder 10 and a nozzle head 20. The nozzle holder 10 is fixed to the outer periphery of a liquid supply pipe 40 such as a boom. The illustrated nozzle holder 10 is a holder that is divided into two and connects two members (the main body 10a and the pressing member 10b) with a screw shaft (not shown) or the like.

  The liquid inlet 11 a provided in the main body 10 a of the nozzle holder 10 is inserted into a through hole 41 provided in the peripheral wall of the liquid supply pipe 40, so that the internal flow path of the main body becomes the internal flow path of the liquid supply pipe 40. Communicate. Further, the periphery of the liquid inlet 11 a is liquid-tightly sealed with an O-ring 15.

  The nozzle head 20 is attached to the main body 10 a of the nozzle holder 10. The nozzle head 20 includes a nozzle 21 and a member joint 22 that detachably connects the nozzle 21 to the nozzle holder 10.

  The nozzle 21 is provided with an injection plate 21b having an injection hole attached to a resin ring 21a.

  The member joint 22 is a member joint of the present invention. This member joint 22 includes a union nut 23 to be screwed onto the male screw 14 of the main body 10a, a lock ring 24 that is mounted on the outer periphery of the union nut 23 on the screwed tip side so as not to be relatively rotatable and to be not relatively movable in the axial direction, It comprises an engaging protrusion 25 with which the lock ring 24 is engaged.

  A part of the lock ring 24 protrudes in the axial direction from the tip of the union nut 23. The lock ring 24 includes an outer ring 24a, an inner flange 24b (see FIG. 1) provided so as to protrude radially inward in the middle of the outer diameter of the outer ring, and a free end from a radially inner end of the inner flange. Has a cantilevered spring ring 24c extending in a direction away from the union nut.

  Between the inner peripheral surface of the outer ring 24a and the outer peripheral surface of the spring ring 24c, there is an annular gap 24d that allows diameter expansion due to elastic deformation of the spring ring 24c.

  The lock ring 24 has a key groove 23a (see FIG. 2) in which a plurality of keys 24e (see FIG. 3) provided on the inner peripheral surface of the outer ring 24a at a constant pitch in the circumferential direction are provided in the lock ring outer fitting portion of the union nut 23. ) To prevent relative rotation with the union nut 23.

  Further, a radial bulging portion 24f (see FIG. 3) having a semicircular cross section provided on the inner peripheral surface of the outer ring 24a extends discontinuously in the circumferential direction provided on the lock ring outer fitting portion of the union nut 23. As shown in FIG. 1, it is dropped into the joint groove 23 b (see FIG. 2) to prevent relative movement in the axial direction with the union nut 23.

  As shown in FIG. 4, the spring ring 24 c protrudes inward in the radial direction formed by a first inclined surface S <b> 1 having a reverse inclination and a second inclined surface S <b> 2 having a larger inclination angle than the first inclined surface S <b> 1 intersecting an obtuse angle. The mountain-shaped lock portions 24g are provided at a constant pitch in the circumferential direction on the inner peripheral side.

  The engaging protrusion 25 is provided on the outer periphery of the root portion of the male screw 14. The engaging protrusion 25 has a top portion positioned radially outward from a circle inscribed in each of the lock portions 24g, and the first cam surface on which the lock portion 24g rides when the union nut 23 rotates in the tightening direction. 25a and a second cam surface 25b with which the lock portion 24g abuts when the union nut 23 rotates in the loosening direction.

  The first cam surface 25a is inclined in the opposite direction to the second cam surface 25b, and the inclination angle θ1 shown in FIG. 5A of the first cam surface 25a is larger than the inclination angle θ2 of the second cam surface 25b. small.

  Regarding the example member joint 22, the inclination angle θ1 is set to about 20 °, the inclination angle θ2 is set to about 45 °, and the inclination angle θ3 of the second inclined surface S2 of the spring ring 24c is set to about 25 °. Of course, these inclination angles are not limited to the illustrated angles.

  The inclination angles θ1 and θ2 referred to here are inclination angles of the cam surfaces with respect to a line perpendicular to a straight line connecting the center of the male screw 14 and the top of the engagement protrusion 25, and the inclination angle θ3 is the spring ring 24c. Is the inclination angle of the second slope S2 with respect to a line perpendicular to a straight line connecting the center of the groove and the groove bottom between the adjacent lock portions 24g.

  In the illustrated spray nozzle unit, four engagement protrusions 25 are provided at a constant pitch in the circumferential direction. However, if at least one engagement protrusion 25 is provided, the installation purpose is achieved. Further, it is preferable that a plurality of the engagement protrusions 25 are provided at a constant pitch in the circumferential direction, but it is preferable that a force is applied to the lock portion 24g in a balanced manner. .

  The nozzle holder 10, the union nut 23, and the lock ring 24 of the spray nozzle unit 1 of FIG. 1 are all formed of polyacetal. The material is preferably a high-strength resin rather than a metal, but is not limited to polyacetal.

  When the union nut 23 is screwed into the male screw 14 and tightened, the member joint 22 is close to the tightening end point, and the locking portion 24g of the spring ring 24c is the first of the engaging projections 25 provided at the root of the male screw 14. Ride on one cam surface 25a.

  Since the inclination angle θ1 of the first cam surface 25a is small, the spring ring 24c is elastically deformed and expanded in diameter by a component force generated at the contact portion between the first cam surface 25a and the lock portion 24g, whereby the lock portion 24g The engagement protrusion 25 is smoothly overcome.

  On the other hand, if the union nut 23 receives vibration in a state where the union nut is at the tightening end point, the union nut 23 tends to rotate in the loosening direction by the force acting on the engagement surface of the screw. However, at this time, the second inclined surface S2 of the lock portion 24g of the lock ring 24 is engaged with the second cam surface 25b having a large inclination angle of the engagement protrusion 25 (see FIG. 5B), thereby Looseness is prevented.

  As described above, when the expanded state due to the elastic deformation of the spring ring 24c is maintained at the position where the lock portion 24g contacts the engaging protrusion 25, the elastic restoring force of the spring ring 24c is also the second inclined surface S2. It is added to the pressing force against the second cam surface 25b.

  Further, the tightening of the union nut 23 increases the frictional force and elastic restoring force of the screw fitting portion. With these actions, the resistance against rotation of the lock ring 24 in the loosening direction is increased, and the union nut 23 is stably prevented from loosening.

  FIG. 6 shows another example of the spray nozzle unit of the present invention. In the spray nozzle unit 1 of FIG. 6, a nozzle holder 10 provided with a function of switching the direction of the nozzle head 20 is employed.

  The nozzle holder 10 includes a first pipe joint 11 composed of a two-part member fixed to the outer periphery of a liquid supply pipe 40 such as a boom, a second pipe joint 12 connected to the first pipe joint, and the second pipe joint. And a third pipe joint 13 that is externally fitted and connected.

  The second pipe joint 12 includes a first piece 12a that is divided into two parts in which the rear side of the O-ring 15 is externally inserted into the tip opening of the first pipe joint 11 and the tip side of the first piece 12a. This is composed of two parts, a second piece (bamboo nipple) 12b, which is liquid-tightly mounted on the outer periphery of the small-diameter cylindrical portion with an O-ring 15 interposed.

  The illustrated third pipe joint 13 is an L-shaped joint whose front end side is bent by 90 ° with respect to the rear side, and the second piece 12b is press-fitted into a hole on the rear side of the third pipe joint 13 to form the second pipe joint. 12 and the 3rd pipe joint 13 are connected so that relative rotation is impossible.

  The first pipe joint 11, the second pipe joint 12, and the third pipe joint 13 are all formed of high-strength resin such as polyacetal, and the press-fitting portion of the second piece 12b with respect to the third pipe joint 13 is a seal. Even if no material is installed, it is sealed fluid-tight.

  The small-diameter cylindrical portion 12c of the first piece 12a of the second pipe joint 12 is inserted into the hole of the third pipe joint 13, and the third pipe joint 13 via a communication hole 12d provided in the middle of the small-diameter cylindrical portion 12c. Is connected to the passage inside the small-diameter cylindrical portion 12c. A total of three communication holes 12d are provided at a predetermined pitch (for example, 45 ° pitch) in the circumferential direction.

  The nozzle head 20 is connected to the male screw 14 at the tip of the third pipe joint 13 using the member joint 22 described above. Reference numeral 16 in FIG. 6 denotes a filter provided in the third pipe joint 13 as necessary.

  In the spray nozzle unit 1 of FIG. 6, the connection of the second pipe joint 12 to the first pipe joint 11 is also performed using the member joint 22 described above.

  When the union nut 23 of the member joint 22 used for connecting the second pipe joint 12 is loosened, the second pipe joint 12 and the third pipe joint 13 can be rotated together. By the rotation, as shown by a one-dot chain line in FIG. 7, the connection position of the communication hole 12 d with respect to the internal flow path of the third pipe joint 13 and the direction of the nozzle head 20 are switched. Therefore, the direction of the nozzle head 20 is fixed by tightening the union nut 23 again.

  FIG. 8 shows that the liquid remaining in the liquid supply pipe 40 is prevented from dripping from the nozzle hole of the nozzle head 20 when the spraying of the liquid is stopped. 1 shows an example of a spray nozzle unit 1 incorporating a diaphragm valve 30 for use.

  The diaphragm valve 30 includes a cap-shaped valve body 31 and a valve body 32 having a rubber valve membrane 32a and a return spring 33 that urges the valve body in a valve closing direction, and is supplied with liquid. When the internal pressure of the liquid supply pipe 40 is increased, the diaphragm valve 30 is opened and the liquid is ejected from the nozzle head 20, and when the liquid supply is stopped and the internal pressure of the liquid supply pipe 40 is reduced, the diaphragm valve 30 is opened. Is closed to prevent the liquid from dripping from the nozzle head 20.

  The diaphragm valve 30 is attached to the first pipe joint 11A by the member joint 22 described above.

  The spray nozzle unit 1 of FIG. 8 is different from the spray nozzle unit 1 of FIG. 6 in that a diaphragm valve 30 is additionally installed using a first pipe joint 11A having a structure different from that of FIG. The other configuration is the same as that of the spray nozzle unit 1 of FIG.

  FIG. 9 shows a member joint 22 in which a union nut is replaced with a bottomed cylindrical cap (cap nut) 26 having an internal thread 26a. The member joint 22 using the cap 26 can be used for an application in which the end of the pipe line is hermetically closed with a cap.

  As the spray nozzle unit 1 for spraying liquid, for example, one having a nozzle holder 10 with a branch pipe as shown in FIG. 10 is commercially available.

  For such a spray nozzle unit 1, the nozzle head 20 attached to the main pipe 17 and the branch pipe 18 is removed with the other removed, and the tip opening of the removed pipe is covered with a bottomed cylindrical cap. It may be used by blocking it with. The member joint of the present invention is effective for stable fixing of the cap in such a case.

1, 1A Spray nozzle unit 10, 10A Nozzle holder 10a Main body part 10b Holding member 11, 11A First pipe joint 11a Liquid inlet 12 Second pipe joint 12a First piece 12b Second piece 12c Small diameter cylindrical part 12d Communication hole 13 First 3 pipe joint 14 male thread 15 O ring 16 filter 17 main pipe 18 branch pipe 20, 20A nozzle head 21 nozzle 21a resin ring 21b jet plate 22 member joint 23 union nut 23a key groove 23b engagement groove 24 lock ring 24a outer ring 24b inside Flange 24c Spring ring 24d Clearance 24e Key 24f Radially bulging portion 24g Locking portion 25 Engaging projection 25a First cam surface 25b Second cam surface 26 Cap 26a Female thread 30 Diaphragm valve 31 Valve body 32 Valve body 32a Valve membrane 33 Return spring 40 Liquid supply pipe 1 through hole 50 cart 51 boom S1 inclination angle of the first inclined surface S2 second slope θ1 first second slope of the inclination angle θ3 locking portion of an inclination angle θ2 second cam surface of the cam surface

Claims (5)

A member joint (22) comprising a union nut (23) and a connection partner member having a male screw (14) at the end, and screwing the union nut (23) onto the male screw (14) of the connection partner member. There,
The union nut (23) has a lock ring (24) that is mounted on the outer periphery of the screwed tip side so as not to rotate relative to the shaft and cannot move in the axial direction. A part of the lock nut projects from the tip of the union nut (23) in the axial direction The lock ring includes an outer ring (24a), an inner flange (24b) that protrudes radially inward from the inner diameter of the outer ring, and a free end extending from the radially inner end of the inner flange. A cantilevered spring ring (24c) extending in a direction away from the outer ring (24c), and between the inner peripheral surface of the outer ring (24a) and the outer peripheral surface of the spring ring (24c) There is a gap (24d) that allows diameter expansion by elastic deformation of (24c),
The spring ring (24c) is a chevron projecting radially inwardly formed by intersecting an obtuse angle with a first inclined surface (S1) inclined in the opposite direction and a second inclined surface (S2) having a larger inclination angle than the first inclined surface. The lock part (24g) has a constant pitch in the circumferential direction on the inner peripheral side, and the connection partner member is engaged with the lock part (24g) on the outer periphery on the base end side of the male screw (14). At least one engagement protrusion (25) protruding radially outward from a circle inscribed in each of the
The engagement protrusion (25) includes a first cam surface (25a) having a small inclination angle on which the lock portion rides when the union nut (23) rotates in a tightening direction, and a direction in which the union nut (23) is loosened. A member joint including a second cam surface (25b) having a larger inclination angle than the first cam surface with which the lock portion (24g) abuts when rotating in the direction.   The member coupling according to claim 1, comprising a plurality of the engaging protrusions (25) at a constant pitch in the circumferential direction. A bottomed cylindrical cap (26) having a female screw (26a) and a connection partner member having a male screw (14) to which the female screw (26a) is screwed to the end are provided, and the cap (26) is a male screw (14 And a member joint (22) to be screwed onto
The cap (26) has a lock ring (24) that is mounted on the outer periphery of the screwed tip side so as not to rotate relative to the shaft and cannot move in the axial direction. A part of the lock ring protrudes axially from the tip of the cap (26) . The lock ring includes an outer ring (24a), an inner flange (24b) provided on the inner diameter portion of the outer ring so as to protrude radially inward, and a free end extending from the radially inner end of the inner flange to the cap (26 ) has a supporting spring ring cantilevered-out extending in a direction away (24c) from between the outer peripheral surface of the outer ring (the inner circumferential surface of 24a) the spring ring (24c), said spring There is a gap (24d) that allows diameter expansion due to elastic deformation of the ring (24c),
The spring ring (24c) is a chevron projecting radially inwardly formed by intersecting an obtuse angle with a first inclined surface (S1) inclined in the opposite direction and a second inclined surface (S2) having a larger inclination angle than the first inclined surface. The lock part (24g) has a constant pitch in the circumferential direction on the inner peripheral side, and the connection partner member is engaged with the lock part (24g) on the outer periphery on the base end side of the male screw (14). At least one engagement protrusion (25) protruding radially outward from a circle inscribed in each of the
The engagement protrusion (25) includes a first cam surface (25a) with a small inclination angle that the lock portion rides when the cap (26) rotates in the tightening direction, and the cap (26) rotates in the loosening direction. A member joint including a second cam surface (25b) having a larger inclination angle than the first cam surface with which the lock portion (24g) abuts.   The member coupling according to claim 3, comprising a plurality of the engaging protrusions (25) at a constant pitch in the circumferential direction.   A connection partner nozzle holder (10) having an internal flow path and a nozzle head (20) combined with the nozzle holder are provided. The nozzle head (20) includes a nozzle (21) having a nozzle and the nozzle as the nozzle. The member joint according to claim 1 or 2, comprising a member joint (22) connected to the holder (10), and comprising a union nut (23) and a spring ring (24c) as the member joint (22). The nozzle (21) is fixed to the tip of the nozzle holder (10) by being fastened to the union nut (23) screwed into the male screw (14) at the tip of the nozzle holder (10). Spray nozzle unit for spraying.

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