JP4740652B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint, and more particularly, to a locking structure for an E-shaped retaining ring of a pipe joint.

Some types of pipe joints for plastic products such as watering nozzles connect these constituent parts to the E-type retaining ring. In such a pipe joint, for example, as shown in FIG. 15A, an inner pipe 2 is inserted into an outer pipe 1, and an E-shaped retaining ring 3 made of an elastic body is fitted on the outer side thereof (FIG. 15B). )reference).
Arc-shaped slits S are provided on the outer peripheral wall of the outer tube 1 at an appropriate interval in the circumferential direction, and an outer peripheral wall of the inner tube 2 is provided with an annular peripheral wall groove 2a through which these slits S can be opened. It is done. The E-shaped retaining ring 3 has projecting pieces 3A to 3C on its inner diameter side.
When the E-shaped retaining ring 3 is expanded and fitted to the outside of the outer tube 1 and the projecting pieces 3A to 3C are inserted into the slit S, the tips of the projecting pieces 3A to 3C project into the peripheral wall groove 2a, and the outer tube 1 and the inner tube 2 Are connected in the axial direction. An O-ring 4 provided near the tip of the inner tube 2 seals the gap between the outer tube 1 and the inner tube 2.

  In such a pipe joint, since the E-shaped retaining ring 3 can slide along the peripheral wall groove 2a together with the outer pipe 1, these pipes are secured while ensuring the waterproofness between the outer pipe 1 and the inner pipe 2. Can be pivotably connected. As conventional techniques, for example, the same type of pipe joint is disclosed in Patent Documents 1 and 2 and the like.

JP-A-4-78458 JP-A-11-201351

However, in such a conventional pipe joint, since the E-shaped retaining ring 3 is held on the outer periphery of the outer pipe 1 by its elastic force, the protruding pieces 3A to 3C are easily removed from the slit S. For example, when water pressure is applied to the inside of the pipe, when the outer pipe 1 and the inner pipe 2 are pushed by the water pressure in the direction (length direction), these pipes repel each other, and this repulsive force is applied to the E-shaped retaining ring 3. The protruding pieces 3 </ b> A to 3 </ b> C may be pushed up and floated on the outer tube 31.
Further, if the E-shaped retaining ring 3 is pulled outward, the protruding pieces 3A to 3C can be removed from the slit S relatively easily, so that the pipe joint may be erroneously disassembled.

  As a countermeasure, as shown in Patent Document 1, there is one that attaches an annular body to the outer periphery of the E-shaped retaining ring to prevent the protruding piece from coming off (see Patent Document 1: FIG. 3 “Cover Body 23”). In such a configuration, since the annular body protrudes around the E-shaped retaining ring, the outer diameter of the pipe joint becomes large, which is disadvantageous in terms of the number of parts.

  Moreover, as shown in Patent Document 2, there is a type in which a protruding portion extending in the length direction of the pipe joint is provided on the protruding piece of the E-shaped retaining ring to prevent the protruding piece from coming off (Patent Document 2: FIG. 3). In the case of such a configuration, when the E-shaped retaining ring is assembled to the pipe joint, the projecting part becomes a hindrance and the work tends to be troublesome. In addition, the pipe joint of patent document 2 has the structure which covers the outer periphery of an E-shaped retaining ring with an annular body (refer patent document 2: FIG. 1 "cylinder member 17") similarly to patent document 1.

  The present invention has been made in view of such a situation, and provides a pipe joint in which a protruding piece of an E-shaped retaining ring is difficult to be removed from a slit, and can be easily assembled in a compact configuration. It is an object.

[First invention]
The pipe joint of the present invention for solving the above problems is
An outer tube having slits at intervals in the circumferential direction;
An inner tube having a peripheral wall groove capable of opening the slit;
In a pipe joint having an E-shaped retaining ring provided with a projecting piece that fits into the peripheral wall groove of the inner pipe through the pipe wall of the outer pipe from the slit,
The protruding piece of the E-shaped retaining ring is provided with a return claw that fits in the peripheral wall groove of the inner tube and can be locked to the slit edge of the outer tube.

  According to such a configuration, when the protruding piece of the E-shaped retaining ring is inserted into the slit of the outer tube, the protruding claw of the protruding piece is locked to the slit edge portion of the outer tube, so that the protruding piece is difficult to be removed from the slit. Become. For this reason, even if a force that pushes up the protruding piece of the E-shaped retaining ring acts on the outer tube and the inner tube due to water pressure or the like, the protruding piece stops in the slit and prevents the E-shaped retaining ring from coming off the outer tube. Is done.

Further, since the protruding piece does not come out from the slit, there is no need to attach another member such as an annular body (see Patent Document 1: reference numeral 23 in FIG. 3) around the E-shaped retaining ring. It can also be used with the E-shaped retaining ring exposed to the pipe joint, and it is easy to make the pipe joint compact. Further, since the return claw is stored in the peripheral wall groove of the inner pipe, the return claw is unlikely to become an obstacle when the pipe joint is assembled.
Furthermore, according to the configuration of the present invention, in addition to the elastic force of the E-shaped retaining ring, the thickness of the E-shaped retaining ring (see D0 in FIG. 15B) is made thinner in order to prevent the protruding piece from coming off with the return claw. Can be. As a result, the E-shaped retaining ring can be easily expanded against its elastic force, and the attachment can be simplified.

  In the present invention, the “E-shaped retaining ring” includes a general shape in which the projecting pieces are provided at three locations in accordance with both ends of the ring and the intermediate portion, and any of these projecting pieces does not exist. And those provided with protruding pieces at other positions. If it is a protrusion piece which can apply this invention, the position and number will not ask | require.

Further, it is desirable that the return claw extends in the length direction of the protruding piece, that is, in the ring circumferential direction. When projecting pieces are provided on the E-type retaining ring, if the length in the length direction (ring circumferential direction) is large, the contact area between the outer tube and the inner tube of the projecting piece increases. Can be increased. However, if the protruding piece is too long, it is necessary to lengthen the slit of the outer tube, and the strength of the outer tube tends to decrease.
As described above, according to the configuration in which the return claw extends in the length direction (ring circumferential direction) of the protruding piece, the return claw is received in the peripheral wall groove of the inner tube and contacts the inner tube together with the protruding piece. Stopping in the direction can be stopped. As a result, it is possible to increase the connection strength between the outer tube and the inner tube while keeping the slit length of the outer tube at an appropriate length.

[Second invention]
Among the protruding pieces 3A to 3C of the E-shaped retaining ring 3, particularly, both end portions thereof (the opposite end portions), that is, the vicinity of the protruding pieces 3A and 3C in FIG. 15B float on the peripheral surface of the outer tube 1. Cheap. For this reason, when a finger or a structure is caught on such a portion, the E-shaped retaining ring is easily detached from the outer tube.

Therefore, the pipe joint of the present invention (second invention) comprises the structure of the first invention,
An outer tube having slits at intervals in the circumferential direction;
An inner tube that is inserted inside the outer tube and has a peripheral wall groove in which the slit can be opened;
Fits into the peripheral wall groove of the inner tube through the tube wall of the outer tube from the slit, a pipe joint having an E-shaped retaining ring made of elastic material connecting the inner tube and the outer tube in the axial direction ,

The projecting pieces provided in the radially inward direction at both ends and an intermediate portion of the ring of the E-shaped retaining ring,
The slits penetrating the wall surface of the outer tube, and both end slits and intermediate slits that can be fitted to the projecting pieces of the ring both ends and ring middle part of the E-shaped retaining ring,
A pair of return claws provided on projecting pieces at both ends of the ring of the E-shaped retaining ring and extending in opposite directions from the circumferential rear ends of these projecting pieces;

When the outer tube and the inner tube are connected, when the E-shaped retaining ring expands against the elastic force on the side of the outer tube, the projecting piece of the ring intermediate portion fits into the intermediate slit. When the pair of return claws can get over the edges of the slits on both ends, the pair of return claws get over the edges of the slits on both ends and the E-shaped retaining ring returns to the original state. The return claw is configured to fit in the peripheral wall groove of the inner tube and be caught by the edge of the both-end slit.

According to such a configuration, since both ends of the E-shaped retaining ring are stopped at the slit edge by the return claw, the lifting of both ends of the E-shaped retaining ring can be effectively suppressed.
Further, since the return claw extends to the rear end in the circumferential direction, the return claw can be pulled out from the slit edge by an operation such as pulling the tip of the E-shaped retaining ring outward or downward. As a result, the E-shaped retaining ring once assembled to the outer tube can be removed from the outer tube by a relatively simple operation, and maintenance such as tube replacement and cleaning becomes easy.

  In the second invention, with respect to the interval between the return claws, the tip position of the return claws may be about 160 ° to 250 ° apart in the circumferential direction of the E-shaped retaining ring. If it is smaller than this range, it is easy for the return claw to come out of the slit, and if it is larger than this range, it becomes difficult for the return claw to come off from the slit edge when the E-type retaining ring is removed. The distance is preferably about 200 ° to 240 °, more preferably about 220 °.

[Third invention]
The pipe joint structure of the present invention (third invention) comprises the structure of the first invention,
The projecting piece is divided by a notch groove that opens to the inner diameter side of the E-shaped retaining ring, and the side surface of the projecting piece is pushed by the slit edge of the outer tube so that the return claw is It is characterized in that an inclined surface that is bent toward the cut groove side is provided.

According to such a configuration, when the protruding piece is inserted into the slit of the outer tube, the inclined surface of the protruding piece is pushed by the slit edge and the return claw is bent toward the cut groove. When the inclined surface gets over the slit edge, the return claw returns to its original state and is caught by the slit edge.
As described above, by adding a structure that bends the return claw to the protruding piece, the assembly work of the E-shaped retaining ring can be further simplified. In addition, since the protruding piece is divided into a plurality of small pieces, an incidental effect is obtained that it is difficult for the protruding piece to be formed in the protruding piece when the E-shaped retaining ring is formed.

The pipe joint structure of the present invention (first to third inventions) is effective when applied to a pipe joint of a watering device such as a watering nozzle or a hose reel. The watering device to which the present invention (first to third inventions) is applied has good pressure resistance, and can fit an E-shaped retaining ring in a pipe joint in a compact manner.
In particular, when the present invention is applied to a pipe joint that connects a grip portion and a head portion of a watering nozzle, a product with excellent design and durability can be obtained. It is also possible to adjust the amount of water and switch the water shape (jet, mist, etc.) by rotating one of the outer tube or the inner tube.
In addition, when the present invention is applied to a pipe joint that connects a water pipe and a sprinkling hose of a drum part or a shaft part of a hose reel, a product that has good hose winding operability and is difficult to come off due to water pressure. Obtainable.
In addition, examples of the watering device to which the present invention can be applied include a hose connector for directly connecting or branching watering hoses, a faucet connector for connecting a water supply faucet and a watering hose, and the like.

The present invention (first to third inventions) may be applied not only to watering devices, but also to wash surfaces such as shower nozzles and faucets, pipe joints around bathtubs, pipes such as suction pipes of vacuum cleaners and refrigerant pipes of air conditioners. It is also possible to apply to a joint. Further, the present invention can also be applied to pipe joints used for furniture products (rack columns, struts, leg columns, etc.).
The present invention (first to third inventions) may be applied alone, or may be applied in combination of these inventions as necessary. Moreover, you may combine the other invention described in this specification with this invention (1st-3rd invention).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
An exploded perspective view of the pipe joint of the first embodiment is shown in FIG. In FIG. 1, reference numeral 11 denotes an outer tube, reference numeral 12 denotes an inner tube, and reference numeral 13 denotes an E-shaped retaining ring (hereinafter referred to as an E-ring). The E-ring 13 is expanded and assembled so as to straddle the outer tube 11 with the inner tube 12 inserted into the outer tube 11.

  A ring groove 11 a is formed on the outer peripheral wall of the outer tube 11. The ring groove 11a is continuous in the circumferential direction, leaving an arcuate bridging portion 11b that fills the gap at the tip of the E-ring 13. The depth of the ring groove 11a is approximately the same as the thickness of the E-ring 13. When the E-ring 13 is placed in this groove, the groove is buried and the outer diameter of the pipe joint becomes uniform. That is, there is no protruding portion where the E-ring 13 is caught on the outer peripheral wall of the outer tube 11, and the usability of the pipe joint is improved.

  Three slits S that penetrate the wall surface of the outer tube 11 are formed in the ring groove 11a (see FIG. 2). The slits S are provided at two locations on both sides of the bridging portion 11b and at one location on the opposite side of the bridging portion 11b. When the E ring 13 is fitted into the ring groove 11a, projecting pieces 13A to 13C of the E ring 13 to be described later project inward from the slits S through the tube wall of the outer tube 11.

As shown in FIG. 1, peripheral wall grooves 12 a and 12 b are formed on the outer peripheral wall of the inner tube 12. The peripheral wall grooves 12 a and 12 b are connected in a ring shape in the circumferential direction of the inner tube 12. Of these peripheral wall grooves 12a and 12b, the peripheral wall groove 12a is provided at a position where the slit S of the outer tube 11 can be opened in the length direction of the pipe joint. In other words, in a state where the tip of the outer tube 11 is in contact with the thick portion 12c of the inner tube 12, the circumferential wall groove 12a overlaps the ring groove 11a and the slit S is opened in the circumferential wall groove 12a.
An O-ring 14 is attached to the peripheral wall groove 12b. The O-ring 14 is in close contact with the inner wall surface of the outer tube 11 on the tip side of the peripheral wall groove 12a of the inner tube 12, and seals the gap between the outer tube 11 and the inner tube 12 (see FIG. 4).

  The E-ring 13 is made of an elastic material such as resin, and projecting pieces 13A and 13C project from both ends of the ring, and projecting pieces 13B project from the inner side to the inner diameter side. The protruding pieces 13 </ b> A to 13 </ b> C are integrally formed with the E ring 13.

The projecting pieces 13 </ b> A to 13 </ b> C have a thickness and a length that can be fitted into the slit S of the outer tube 11, and the arcuate surfaces on the inner diameter side are formed along the peripheral wall groove 12 a of the inner tube 12. The gap between the protruding pieces 13A and 13C is substantially equal to the length of the bridging portion 11b of the outer tube 11.
When the outer tube 11 and the inner tube 12 are connected, the projecting pieces 13A to 13C protrude from the slits S into the peripheral wall groove 12a of the inner tube 12 to stop the movement of these tubes in the axial direction (see FIGS. 3 and 3). 4).

  At the rear end in the circumferential direction of the protruding pieces 13A and 13C, return claws 15, 15 extend along the arcuate surface in the length direction. The return claws 15, 15 are formed integrally with the projecting pieces 13A to 13C, and the tips of the return claws 15, 15 are chamfered with a semicircular cross section. When the return claws 15, 15 are stopped at the slit edge of the outer tube 11, the claw tip makes it easy for the claw tip to pass over the slit edge.

  As shown in FIG. 5, the positional relationship between the return claws 15 and 15 is at the same distance on both sides of the protruding piece 13B, and the tip positions of the return claws 15 and 15 are separated by an angle θ in the circumferential direction. . The angle θ is about 160 ° to 250 °, preferably about 200 ° to 240 °, and more preferably about 220 °. When set in such a range, while keeping the function of preventing the return claws 15 and 15 from coming off sufficiently, as will be described later, the return claws 15 and 15 are removed from the slit by a relatively simple operation during maintenance or the like. Can do.

  When connecting the outer tube 11 and the inner tube 12, the inner tube 12 is inserted into the outer tube 11 with the O-ring 14 fitted in the peripheral wall groove 12 b of the inner tube 12. At this time, the circumferential wall groove 12a of the inner tube 12 and the ring groove 11a of the outer tube 11 are aligned in the length direction, and the slit S of the outer tube 11 is opened in the circumferential wall groove 12a of the inner tube 12.

  Next, as shown in FIG. 6, both ends of the E-ring 13 are widened on the side of the outer tube 11, and the gap is pushed toward the ring groove 11a. Then, the E-ring 13 expands against the elastic force, the protruding piece 13B fits into the slit S, and the protruding pieces 13A and 13C come to a position sandwiching the outer tube 11 (groove surface of the ring groove 11a). At this time, when the portions of the E-ring 13 that are slightly above the return claws 15, 15 are pressed inward, as shown in FIG. 7, the return claws 15, 15 get over the slit edge, and the protruding pieces 13A, 13C At the same time, the return claws 15 and 15 are fitted in the slit S and fit in the peripheral wall groove 12a (see FIG. 8). Thereby, the return claws 15 and 15 are caught by the slit edge part (inner wall of the outer tube 11) of the outer tube 11, and the protrusion pieces 13A and 13C are prevented from coming off.

  On the other hand, when removing the E-ring 13 from the outer tube 11, inserting the tip of a flathead screwdriver near the tip of the projecting pieces 13A, 13C and pulling the tip of the E-ring 13 outward, the return claws 15, 15 8 returns to the state of FIG. 7 from the state of FIG. 8, and the E-ring 13 is removed from the ring groove 11a relatively easily.

  As described above, according to the pipe joint of the present embodiment, the return claws 15 and 15 are hooked on the slit edge portion of the outer pipe 11 to prevent the protruding pieces 13A and 13C from coming off, so that the outer pipe 11 and the inner pipe 12 are hydraulically pressurized. Are repelled in the length direction (the direction in which the outer tube 11 and the inner tube 12 come out) and even when a load is applied to the return claws 15, 15, the end of the E-ring 13 does not rise, and the outer tube 11 and the inner tube 12 can be kept stable. In addition, there is no fear that the operator pulls the protruding pieces 13A and 13C and thereby accidentally removes the E-ring 13.

Further, in order to prevent the return claws 15 and 15 from coming out of the protruding pieces 13A and 13C from the slit S, it is not necessary to separately provide a separate member such as an annular body covering the E ring 13 from the outside, and the pipe joint can be made compact. Can be designed.
Further, by making the ring thickness D1 (see FIG. 5) thinner, the flexibility of the E-ring 13 can be increased and the assembly to the outer tube 11 can be facilitated.

  Further, in the present embodiment, the E-ring 13 can be removed from the outer tube 11 by a relatively simple operation after the return claws 15 and 15 are once locked to the slit edge, so that the pipe joint is cleaned and the parts are replaced. Maintenance work such as is also easy.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. As shown in FIG. 9, in the watering nozzle of the second embodiment, a pipe joint having a configuration substantially similar to that of the first embodiment is employed at the connecting portion between the grip 20 </ b> A and the head 20 </ b> B. The pipe joint includes an outer tube 21 at the front end of the grip 20A, an inner tube 22 at the rear end of the head 20B, and an E-ring 23 that connects these tubes.

A ring groove 21 a is formed at the tip of the outer tube 21. The ring groove 21a continues in the circumferential direction of the outer tube 21 leaving the bridging portion 21b, and has three slits S, two on both sides of the bridging portion 21b and one on the opposite side of the bridging portion 21b. .
A peripheral wall groove 22a is provided on the peripheral surface of the inner tube 22, and an O-ring 24 is fitted in a peripheral wall groove (not shown) parallel to the peripheral wall groove 22a.

  Protruding pieces 23 </ b> A to 23 </ b> C extend to positions corresponding to the slits S on the inner diameter side of the E ring 23. The thickness in the length direction of the pipe joints of the protruding pieces 23A to 23C is thinner than that of the first embodiment described above, and the watering nozzle is compact and lightweight. Return claws 25 are extended at the circumferential ends of the protruding pieces 23A and 23C.

  When connecting the grip 20 </ b> A and the head 20 </ b> B, the inner tube 22 is inserted inside the outer tube 21, and the slit S of the outer tube 21 is opened in the peripheral wall groove 22 a of the inner tube 22. Next, as in the first embodiment, while expanding the E-ring 23, the E-ring 23 is pushed into the ring groove 21a of the outer tube 21, and the projecting pieces 23A to 23C are fitted into the corresponding slits S and protruded into the peripheral wall groove 22a. Then, the return claws 25, 25 of the protruding pieces 23A, 23C are hooked on the slit edge of the outer tube 21 to prevent the E-ring 23 from coming off (see FIG. 8).

According to the watering nozzle of the second embodiment, even when the water pressure in the outer tube 21 and the inner tube 22 is increased, the return claws 25 and 25 are caught by the slit edges, and the protruding pieces 23A and 23C are prevented from coming off. Therefore, the E ring 23 does not rise from the outer tube 21.
In addition, the joint portion between the grip 20A and the head 20B becomes a water spray nozzle that is compact and has a good design, which helps to reduce the material cost. Further, even if the E ring 23 is exposed at the connecting portion between the grip 20A and the head 20B, there is no fear that the user of the watering nozzle will accidentally remove the E ring 23.

  Further, since the E-ring 23 can slide in the peripheral wall groove 22a, the water amount can be adjusted or the water shape can be switched (jet shape, mist shape, etc.) by holding the grip 20A and rotating only the head 20B. At this time, since the return claws 25 and 25 slide in the peripheral wall groove 22a integrally with the E-ring 23, they do not interfere with the rotation operation of the head 20B.

[Third Embodiment]
The pipe joint of 3rd Embodiment was shown in FIGS. In the present embodiment, the outer tube 31 and the inner tube 32 are connected by a hexagonal E-ring 33. The outer tube 31 and the inner tube 32 employ hexagonal cylindrical tubes similar to the E ring 33.

A ring groove 31 a is provided on the outer peripheral wall of the outer tube 31. The ring groove 31a continues to the side surface of the outer tube 31 leaving the bridging portion 31b (see FIG. 11). Three slits S are formed on both adjacent surfaces of the bridging portion 31b of the ring groove 31a and on the opposite surface of the bridging portion 31b (see FIG. 11).
As shown in FIG. 10, a peripheral wall groove 32 a is formed on the outer peripheral wall of the inner tube 32. When the inner pipe 32 is inserted into the outer pipe 31, the ring groove 31a and the peripheral wall groove 32a coincide with the length direction of the pipe joint.

Protruding pieces 33 </ b> A to 33 </ b> C extend inside the E-ring 33 at positions corresponding to the slits S. Return claws 35 are formed on both side ends of the protruding pieces 33A to 33C, respectively.
The plate surfaces of the projecting pieces 33 </ b> A to 33 </ b> C are divided by a notch groove K that opens from the inner diameter side, that is, from the vicinity of the root to the tip side. On the side surfaces at both ends in the length direction of the projecting pieces 33 </ b> A to 33 </ b> C, inclined surfaces 34 and 34 are formed so as to become narrower toward the tip side (see FIG. 12).

  When connecting the outer tube 31 and the inner tube 32, the inner tube 32 is inserted into the outer tube 31, the circumferential wall groove 32a is aligned with the ring groove 31a, and the slit S is opened in the circumferential wall groove 32a. In this state, the E-ring 33 is expanded and fitted into the ring groove 31a, and the projecting pieces 33A to 33C are pushed into the slits S. Then, the inclined surfaces 34 and 34 of the projecting pieces 33A to 33C are pushed by the slit edge, and the return claws 35 and 35 are bent toward the cut groove K (see FIG. 12A). And if the inclined surfaces 34 and 34 get over a slit edge, a bending | flexion will be open | released and the return claws 35 and 35 will be latched by a slit edge (inner wall of the outer tube 31) (refer FIG.12 (B)). Accordingly, the protruding pieces 33A to 33C are prevented from being removed from the slit S, and the E ring 33 is prevented from being detached from the outer tube 31.

  In addition, you may employ | adopt such a structure of the return claws 35 and 35 for the protrusion piece of 1st Embodiment mentioned above or 2nd Embodiment. For example, by adopting the protruding pieces 13A to 13C or 23A to 23C, the assembled state of the E-ring can be made more stable, and a pipe joint with good pressure resistance can be obtained. Also, considering the workability of removing the E-ring, it can be adopted only for the intermediate protruding piece 13B or only for 23B.

[Fourth Embodiment]
The pipe joint of 4th Embodiment was shown to FIG. 13 and FIG. In the present embodiment, a hexagonal E-ring 43 is employed, and the return claws 45, 45 are projected in the thickness direction of the projecting pieces 43A to 43C.

A ring groove 41 a is provided on the outer peripheral wall of the outer tube 41. Three slits S are formed in the ring groove 41a at the same position as in the third embodiment.
On the outer peripheral wall of the inner tube 42, a peripheral wall groove 42a is provided at a position overlapping the ring groove 41a in the length direction. The groove width of the peripheral wall groove 42a is larger than the groove width of the ring groove 41a (slit S) (see FIG. 14).

On the inner diameter side of the E-ring 43, protruding pieces 43A to 43C extend at positions corresponding to the slits S. Return claws 45 and 45 project in the thickness direction of the projecting pieces 43A to 43C.
The plate surfaces of the projecting pieces 43 </ b> A to 43 </ b> C are divided by the cut grooves K in the length direction (hexagonal side direction). On the side surfaces at both ends in the thickness direction of the protruding pieces 43 </ b> A to 43 </ b> C, inclined surfaces 44 and 44 are formed so as to become narrower toward the tip side.

  When connecting the outer tube 41 and the inner tube 42, the inner tube 42 is inserted into the outer tube 41, the ring groove 41a and the peripheral wall groove 42a are aligned in the length direction, and the slit S is opened in the peripheral wall groove 42a. Next, the E-ring 43 is expanded and fitted into the ring groove 41a, and the protruding pieces 43A to 43C are pushed into the slits S. Then, the inclined surfaces 44 and 44 of the projecting pieces 43A to 43C are pushed by the slit edge, and the return claws 45 and 45 are bent so as to fall down to the cut groove K side. When the inclined surfaces 44, 44 get over the slit edge, the return claws 45, 45 return to the original state and are caught by the slit edge (see FIG. 14). Accordingly, the protruding pieces 43A to 43C cannot be removed from the slit S, and the E ring 43 is prevented from being detached from the outer tube 41.

  In the fourth embodiment, since the inner walls of the outer tube 41 and the inner tube 42 are hexagonal in cross section, they do not rotate around the axis. That is, the movement in the length direction of the outer tube 41 and the inner tube 42 and the rotation around the axis are stopped simultaneously.

As mentioned above, although 1st-4th embodiment was described, embodiment of this invention is not restricted to these, You may involve a various change as needed.
For example, in the first to fourth embodiments, the protruding pieces of the E-ring are provided in three places according to the both ends and the middle part of the ring, but these positions and numbers are such that the inner tube and the outer tube are connected. If possible, you may change suitably.
In the first to fourth embodiments, the present invention is applied to the pipe joint between the outer pipe and the inner pipe, which are hollow members. However, if only the connecting portion has a hollow structure, the solid member such as a shaft can be used. It is also possible to apply the present invention.
In the third and fourth embodiments, an O-ring that seals between the outer tube and the inner tube is not provided. However, if necessary, the O-ring can be provided on the tip side of the peripheral wall groove of the inner tube.
The shapes of the outer tube, the inner tube, and the E-ring are not particularly limited, and the cross section may be a circle or a hexagon, an ellipse, or another polygon. An engagement portion or the like for preventing rotation may be provided on the peripheral wall of the outer tube or the inner tube.
The material of the E-ring is preferably a resin (polyacetal, nylon, etc.), but other elastic materials such as metal may be used as long as the present invention is applicable.

It is a disassembled perspective view which shows the pipe joint by 1st Embodiment of this invention. It is the II-II sectional view taken on the line of FIG. 1 which shows the outer tube | pipe of the same pipe joint. It is a cross-sectional view which shows the connection state of the pipe joint. It is a notch longitudinal cross-sectional view which shows the connection state of the pipe joint. It is a top view which shows the E ring of the pipe joint. It is a cross-sectional view for explaining how to use the E-ring and showing a state in which the E-ring is detached from the pipe joint. It is a cross-sectional view for explaining how to use the E-ring, and shows a state immediately before the E-ring is fitted into the pipe joint. It is a cross-sectional view for explaining how to use the E-ring and showing a state in which the E-ring is fitted to the pipe joint. It is a disassembled perspective view which shows the watering nozzle provided with the pipe joint by 2nd Embodiment of this invention. It is a disassembled perspective view which shows the pipe joint by 3rd Embodiment of this invention. It is a cross-sectional view which shows the connection state of the pipe joint. It explains how to use the E-ring of the pipe joint. (A) is a partially enlarged cross-sectional view showing a state immediately before the E-ring is fitted to the pipe joint, and (B) is the E-ring fitted to the pipe joint. It is a partial expanded sectional view which shows a state. It is a disassembled perspective view which shows the pipe joint by 4th Embodiment of this invention. It is a longitudinal cross-sectional view which shows the connection state of the pipe joint. The connection state of the conventional pipe joint is shown, (A) is a longitudinal cross-sectional view, (B) is a BB line cross-sectional view.

Explanation of symbols

11 Outer tube 11a Ring groove 11b Bridge part 12 Inner tube 12a Peripheral wall groove 13 E ring (E type retaining ring)
13A-13C Projection piece 14 O-ring 15 Return claw 21 Outer tube 21a Ring groove 21b Bridge part 22 Inner tube 22a Peripheral wall groove 23 E-ring (E-shaped retaining ring)
23A-23C Projection piece 24 O-ring 25 Return claw 31 Outer tube 31a Ring groove 31b Bridge part 32 Inner tube 32a Peripheral wall groove 33 E-ring (E-shaped retaining ring)
33A-33C Projection piece 34 Inclined surface 35 Return claw 41 Outer pipe 41a Ring groove 42 Inner pipe 42a Peripheral wall groove 43 E ring (E type retaining ring)
43A-43C Projection piece 44 Inclined surface 45 Return claw K Cut groove S Slit

Claims (5)

An outer tube having slits at intervals in the circumferential direction;
An inner tube that is inserted inside the outer tube and has a peripheral wall groove in which the slit can be opened;
Fits into the peripheral wall groove of the inner tube through the tube wall of the outer tube from the slit, a pipe joint having an E-shaped retaining ring made of elastic material connecting the inner tube and the outer tube in the axial direction ,

The projecting pieces provided in the radially inward direction at both ends and an intermediate portion of the ring of the E-shaped retaining ring,
The slits penetrating the wall surface of the outer tube, and both end slits and intermediate slits that can be fitted to the projecting pieces of the ring both ends and ring middle part of the E-shaped retaining ring,
A pair of return claws provided on projecting pieces at both ends of the ring of the E-shaped retaining ring and extending in opposite directions from the circumferential rear ends of these projecting pieces;

When the outer tube and the inner tube are connected, when the E-shaped retaining ring expands against the elastic force on the side of the outer tube, the projecting piece of the ring intermediate portion fits into the intermediate slit. When the pair of return claws can get over the edges of the slits on both ends, the pair of return claws get over the edges of the slits on both ends and the E-shaped retaining ring returns to the original state. The pipe joint is configured such that the return claw is received in the peripheral wall groove of the inner pipe and is caught by the edge of the slit on both ends .   The pipe joint according to claim 1, wherein a tip end position of the return claw is separated by about 160 to 250 degrees in a circumferential direction of the E-shaped retaining ring.   The watering nozzle provided with the pipe joint of Claim 1 or 2.   A hose reel comprising the pipe joint according to claim 1.   A watering device comprising the pipe joint according to claim 1.

Images