JP4634588B2 - Corrugated fitting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a corrugated pipe joint used when a bellows-like corrugated pipe is connected to a steel pipe or the like. In particular, the present invention relates to a corrugated pipe joint having an advantage that connection work can be performed without using a spanner, a wrench or the like in a narrow place, or the construction time can be shortened.
[0002]
[Prior art]
FIG. 12 is a diagram schematically illustrating an example of gas piping in a building.
In this piping example, the gas meter 181 is installed outside the building. The gas meter 181 is connected with a city gas supply pipe 180 and an indoor gas pipe (plated steel pipe) 182. Corrugated pipes T for the gas outlets 186 in each room are connected to the steel pipe 182. A gas appliance 189 such as a gas stove is connected to the tip of the gas outlet 186 via a rubber tube 187 or the like. The steel pipe 182 and the corrugated pipe T are usually piped in a building wall or under the floor.
[0003]
The corrugated tube T is a flexible tube in which bellows-like annular irregularities are formed on the outer surface. The corrugated tube T is connected to a chee 182a having a female thread. A corrugated pipe joint 188 is used to connect the corrugated pipe T to the Qi 182a.
[0004]
One conventional example of this type of corrugated pipe joint 188 is disclosed in, for example, Japanese Patent No. 2686237.
FIG. 9 is a cross-sectional view showing a joint (corrugated pipe connected state) after fastening of the joint disclosed in the same reference.
FIG. 10 is a cross-sectional view showing a temporarily inserted state of the corrugated pipe of the joint.
FIG. 11 is a perspective view of the retainer and a view for explaining the operation in which the tip of the corrugated tube gets over the retainer claw.
In the following description, the top, bottom, left, and right refer to the top, bottom, left, and right in FIGS. 9 and 10.
[0005]
The main components constituting the corrugated pipe joint 188 are a joint main body 151, a retainer 154 disposed in the joint main body 151, and a nut 162 screwed onto the upper portion of the joint main body 151.
The joint body 151 is a cylindrical body made of stainless steel, brass or the like. A male screw 151 a is formed on the lower outer peripheral surface of the main body 151. The male screw 151a is screwed into the female screw of the Qi 182a shown in FIG.
[0006]
The joint main body 151 has a through hole extending in the axial direction. A female screw 152a is formed on the upper inner surface of the through hole. The female screw 152a is screwed into the male screw 162a of the nut 162. A concave groove 152b is formed under the female screw 152a. The concave groove 152b has a larger diameter than the female screw 152a. A tapered portion 152c is formed below the concave groove 152b. The taper portion 152c has a taper that becomes narrower from the upper side in the axial direction toward the lower side. A packing groove 152d is formed under the taper portion 152c, and a first packing 168 is fitted into the groove 152d. An annular step portion 152e is formed under the packing groove 152d, and a second packing 153 is fitted therein. The inner diameter of the annular step portion 152e is smaller than the diameter of the concave portion of the corrugated pipe T.
[0007]
The retainer 154 has a sleeve shape disposed in the inner hole of the joint body 151. The outer diameter of the retainer 154 is smaller than the concave groove 152b of the joint body 151.
[0008]
As shown in FIG. 11A, the retainer 154 is formed with a slit 154a extending in the axial direction from the end. A plurality of the slits 154a are formed at equal intervals in the circumferential direction of the retainer. A segment 155 is formed between the slits 154a. At the end of each segment 155, a claw 155a projecting radially inward is formed. The circle formed by the tip of each claw 155a is smaller than the diameter of the convex portion of the corrugated tube T and larger than the diameter of the concave portion. A plurality of protrusions 156 are formed on the outer peripheral surface of the other end of the retainer 154 (the opposite side of the segment 155). These protrusions 156 engage with the inner surface of the nut 162 as shown in FIGS. The retainer 154 has a base made of plastic, claws 155a and the like made of brass, and both are integrally molded.
[0009]
This will be described with reference to FIGS. 9 and 10 again.
The nut 162 is a cylindrical body made of stainless steel, brass or the like. The nut 162 has a through hole through which the corrugated pipe T is passed. On the lower outer peripheral surface of the nut 162, a male screw 162a that is screwed into the female screw 152a of the joint body 151 is formed. A protrusion 163 is formed on the inner surface of the lower end of the nut 162 so as to protrude radially inward. The protrusion 163 is caught by the protrusion 156 of the retainer 154. When the retainer 154 is pushed into the nut 162 from below and both the protrusions 156 and 163 are caught, the retainer 154 and the nut 162 are connected. A packing 157 is fitted into the upper inner surface of the nut 162. In the temporarily tightened state of the nut 162 shown in FIG. 10 (a state where the collar 165 is interposed between the nut 162 and the joint main body 151), the claw 155a at the lower end of the retainer 154 is located on the inner peripheral portion of the concave groove 152b.
[0010]
Next, the operation of the corrugated pipe joint 188 will be described.
First, as shown in FIG. 10, the retainer 154 is disposed in the joint main body 151, and the male screw 162 a of the nut 162 is temporarily tightened to the female screw 152 a of the joint main body 151. FIG. 10 shows a state in which the corrugated tube T has already been inserted into the nut 162, but the following description is about the operation when the corrugated tube T is inserted.
[0011]
Next, when the lower end of the corrugated pipe T is inserted into the through holes of the nut 162 and the joint main body 151 from above, the tip of the corrugated pipe T hits the claw 155a of the retainer 154.
When the corrugated tube T is further pushed in, the tip of the corrugated tube T pushes the claw 155a of the retainer 154 outward and downward. Therefore, as shown in FIG. 11B, the segments 155 are deformed and expanded in the radial direction with the cut end portion of the slit 154a of the retainer 154 as a fulcrum. The expansion deformation of the segment 155 is performed in the concave groove 152b (see FIG. 9) of the joint body 151. Further, when the claw 155a of the retainer 154 gets over the convex portion of the corrugated tube T, the claw 155a engages with the concave portion of the corrugated tube T as shown in FIG.
[0012]
Thereafter, the nut 162 is turned using a tool such as a spanner or a wrench, and is fastened to the joint body 151. As the nut 162 is tightened, the retainer 154 is pushed downward. At this time, since the claw 155a of the retainer 154 is engaged with the concave portion of the corrugated tube T, when the retainer 154 advances, the corrugated tube T is simultaneously pulled down. Further, when the retainer 154 is pushed and advanced, the outer periphery of the retainer 154 is pressed against the tapered surface of the tapered portion 152c of the joint body 151. Thereby, the claw 155a of the retainer 154 fastens the concave portion of the corrugated pipe T in the radial direction. Finally, as shown in FIG. 9, the tip of the corrugated tube T is pressed against the second packing 143. Thereby, the corrugated pipe T and the joint main body 151 are sealed. Note that when the nut 162 is tightened, the tip of the corrugated tube T is crushed.
[0013]
[Problems to be solved by the invention]
In the conventional corrugated pipe joint 188, a tool such as a spanner or a wrench is required when turning the nut 162 in the connection work. However, the steel pipe 182 is often installed under the floor or in a wall, and it is difficult to turn a spanner or a wrench in a narrow place. For this reason, the conventional corrugated pipe joint 188 has a problem that the workability of the connection work is poor.
[0014]
The present invention has been made in view of the above problems, and an object thereof is to provide a corrugated pipe joint that can be easily connected even in a narrow place without using a spanner or a wrench.
[0015]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the corrugated pipe joint of the present invention is a joint for corrugated pipes in which bellows-like annular irregularities are formed on the outer surface; a case having an inner hole into which the end part of the corrugated pipe is inserted; A retainer having a claw inserted into an annular recess on the outer surface of the corrugated pipe disposed in the inner hole, a joint body connected to the case and having a connection with another pipe, and the corrugated pipe and the joint Sealing means for sealing between the body and the sealing means, and the sealing means has a packing pressed against the end portion of the corrugated pipe, and a spring for pressing the packing. A spring biasing force expression mechanism that stretches and presses the packing against the end of the corrugated pipe by extending the spring according to the manual operation of the installer after inserting the corrugated pipe. Features.
[0016]
When the corrugated pipe is inserted into the joint, the spring is preliminarily contracted, and the spring force is not applied to the operator's hand, and the corrugated pipe can be inserted easily. After the corrugated pipe is inserted, the spring extends and strongly presses the packing against the end of the corrugated pipe according to the manual operation of the installer, and sealing is performed. Therefore, the corrugated pipe can be easily and quickly connected without using a tool such as a pliers or a spanner.
[0017]
In the corrugated pipe joint of the present invention, it is preferable that the force by which the spring pushes the packing is stronger than the force by which the operator pushes the corrugated pipe by hand.
By obtaining a strong force that cannot be directly expressed by a normal human force by a spring force, the pressing force of the packing can be increased more than a simple manual insertion force, so that the sealing performance of the joint is further improved.
[0018]
In the corrugated pipe joint according to the present invention, as the spring biasing force expression mechanism, a spring receiver that transmits the force of the spring to the packing, and the spring receiver is locked so as not to move at the position on the joint body side, A mechanism for releasing the lock so that the spring receiver can move to the case side.
When the corrugated pipe is inserted into the joint, the spring receiver is locked. Then, after inserting the corrugated pipe, the lock of the spring receiver is released according to the manual operation of the installer, and the packing is pressed against the pipe end by the spring force.
[0019]
In the corrugated pipe joint according to the present invention, means is provided between the spring receiver and the joint body, between the spring receiver and the joint body, so as to be slidable in the axial direction and not rotatable in the circumferential direction. It is preferable. By this means, the spring receiver is engaged with the joint body so as to be slidable in the axial direction while being prevented from rotating around the joint body.
[0020]
Further, the case and the joint body are rotatably connected, and a means that can slide in the axial direction and cannot rotate in the circumferential direction can be received at the joint body side end of the case. It is also preferable that receiving means is provided, and the spring receiver is locked and unlocked by selecting a relative rotational position of the case and the body. The selection of the relative rotation position can be performed by a manual operation of the installer. When the positions of both means coincide with each other by selecting the relative rotation position, the spring receiver is pushed by the force of the spring and enters the case side.
[0021]
Moreover, in the corrugated pipe joint of this invention, it is preferable that the jig | tool which shrinks the said spring is attached.
By using a jig, even a spring having a large urging force can be easily contracted.
[0022]
Furthermore, in the corrugated pipe joint of the present invention, an outer peripheral tapered surface that swells toward the case side is formed on the outer peripheral surface of the retainer, and an inner peripheral tapered surface that contacts the outer peripheral tapered surface is formed on the case. The corrugated pipe and the retainer are pushed toward the case by the biasing force of the spring, and the inner diameter of the retainer is shrunk by the abutment of the both tapered surfaces and pressed against the corrugated pipe.
In this case, the corrugated tube can be prevented from coming off.
[0023]
In the corrugated pipe joint according to the present invention, the retainer may be composed of a plurality of arc-shaped members having the claws and an elastic member that connects them in a ring shape.
The elastic member absorbs expansion and contraction of the inner diameter when the retainer expands and shrinks while the arc-shaped member is integrally connected.
[0024]
Further, in the corrugated pipe joint of the present invention, the case is composed of two parts that can be disassembled, the inner peripheral tapered surface is formed on one of the parts, and the other part of the spring biasing force expression mechanism is on the other side. A means that can slide in the axial direction and cannot rotate in the circumferential direction can be formed.
For example, when the corrugated pipe is removed from the joint after completion of the construction, one part having the inner peripheral tapered surface is separated from the other part. Thereafter, the retainer and the corrugated pipe can be removed from the case. After that, when both parts are united again, the joint can be reused.
[0025]
Furthermore, in the corrugated pipe joint of the present invention, the joint body is composed of two parts that can be disassembled, and a connecting part is formed on one of the parts so as to be pivotally connected to the case via a stop ring. On the other hand, it is possible to form an accommodating portion for accommodating the spring receiver so as not to rotate in the circumferential direction and to be slidable in the axial direction.
In this manner, the packing body or the spring can be easily replaced by configuring the joint body from two parts.
[0026]
Furthermore, the present invention is connected with The corrugated pipe joint is a joint for a corrugated pipe in which bellows-like annular irregularities are formed on the outer surface; a case having an inner hole into which an end of the corrugated pipe is inserted, and a corrugated pipe disposed in the inner hole. A retainer having a claw inserted into an annular recess on the outer surface of the pipe, a joint body connected to the case and having a connection with another pipe, and a sealing means for sealing between the corrugated pipe and the joint body; An outer peripheral taper surface that squeezes toward the case is formed on the outer peripheral surface of the retainer, and an inner peripheral taper surface that contacts the outer peripheral taper surface is formed on the case. There is provided an urging means for pushing the tube and the retainer toward the case side, and the inner diameter of the retainer is reduced by the contact of both the tapered surfaces and is pressed against the corrugated tube. It is characterized in.
[0027]
Further, a mechanism for aligning the axial center of the case with the axial center of the retainer may be provided.
Since the position of the retainer is properly determined by this mechanism, the retainer can be accurately widened when the corrugated pipe is inserted. Therefore, the corrugated tube can be inserted surely and smoothly.
[0028]
Furthermore, the sealing means has a packing pressed against the outer surface of the corrugated pipe, and a spring that presses the packing. The spring is contracted in advance before construction, and the spring is pressed according to the insertion force of the corrugated pipe. It is possible to provide a spring biasing force release mechanism that extends the pressure and presses the packing against the outer surface of the corrugated pipe.
The urging means may include a spring and a spring urging force releasing mechanism that contracts the spring in advance before construction and extends the spring according to the insertion force of the corrugated pipe.
[0029]
Furthermore, as the spring biasing force release mechanism, a guide for transmitting the spring force to the packing or the corrugated pipe joint is locked, and the guide is locked so as not to move at a position on the joint body side. And a mechanism for releasing the lock so as to be movable toward the case side.
The lock can also be released by pushing the guide with the corrugated tube.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
{First Example}
FIG. 1 is a sectional view showing a state before construction of a corrugated pipe joint according to the first embodiment of the present invention. (A) is side sectional drawing, (B) is a top view which shows the engagement positional relationship of a key and a key groove.
FIG. 2 is a cross-sectional view showing a state of the corrugated pipe joint according to the first embodiment of the present invention when the corrugated pipe is inserted. (A) is side sectional drawing, (B) is a top view which shows the engagement positional relationship of a key and a key groove.
FIG. 3 is a sectional view showing a state when the construction of the corrugated pipe joint according to the first embodiment of the present invention is completed. (A) is side sectional drawing, (B) is a top view which shows the engagement positional relationship of a key and a key groove.
[0031]
4A is a plan view showing details of the spring receiver of the corrugated pipe joint of FIGS. 1 to 3, and FIG. 4B is a cross-sectional view of the spring receiver.
5A is a plan view of the outer case of the corrugated pipe joint of FIGS. 1 to 3 as viewed from below, and FIG. 5B is a cross-sectional view of the outer case.
6A is a plan view of the body body of the corrugated pipe joint of FIGS. 1 to 3 as viewed from above, and FIG. 6B is a cross-sectional view of the body body.
7 (A) is a view of the retainer of the corrugated joint of FIGS. 1 to 3 as viewed from above, FIG. 7 (B) is a view of the retainer as viewed from below, and FIG. It is a perspective view of the retainer.
Note that in the following description, the vertical direction refers to the vertical direction in FIGS. 1A, 2A, and 3A unless otherwise specified.
[0032]
First, the overall configuration of the corrugated pipe joint will be described mainly with reference to FIGS.
The corrugated pipe joint 10 is roughly divided into the following parts.
(1) A case 11 composed of two parts, an inner case 12 and an outer case 15.
(2) A retainer 21 disposed between the inner case 12 and the outer case 15.
(3) A joint body 31 composed of two parts of a connection nut 32 and a body main body 35 and connected to the case 11.
(4) A seal mechanism 41 having a packing 43, a coil spring 45, and a spring receiver 51 and disposed displaceably inside the case 11 and the joint body 31.
[0033]
First, the case 11 will be described.
The case 11 includes a brass inner case 12 and an outer case 15 in this example. The inner case 12 is formed with an inner hole 13 into which the end portion of the corrugated pipe is inserted. An inner peripheral tapered surface 12A is formed at the inner lower end edge of the inner case 12 so as to swell inwardly upward. On the outer peripheral surface of the inner case 12, a step portion 12a is formed at a substantially central portion in the axial direction. A male screw 12b is cut on the outer peripheral surface of the inner case 12 below the stepped portion 12a. The male screw 12 b is screwed into the female screw 15 b of the outer case 15.
[0034]
A female screw 15 b that is screwed into the male screw 12 b of the inner case 12 is cut on the inner peripheral surface on the upper end side of the outer case 15. The outer case 15 and the inner case 12 have a double structure that can be connected and separated by attaching and detaching the screws 15b and 12b. As shown in FIG. 5A, the outer peripheral surface of the upper end side of the outer case 15 is a hexagonal hexagonal outer peripheral surface 15a. A ring groove 15 c is formed on the outer peripheral surface near the lower end of the outer case 15. A stop ring 30 to be described later is disposed in the ring groove 15c.
[0035]
Inside the outer case 15, a retainer receiving portion 16 projecting inward is formed. A protrusion 16 a that protrudes upward is formed on the end edge of the retainer receiving portion 16. On the inner peripheral surface of the outer case 15, as shown in FIG. 5A, key grooves 17 are formed at four locations that are 90 ° apart from each other in the circumferential direction. These key grooves 17 are cut so as to extend in the axial direction from the lower end surface of the outer case 15 to the lower surface of the retainer receiving portion 16.
[0036]
These four key grooves 17-1 to 17-4 are formed in the following positional relationship with respect to the top portions 15 a-1 to 15 a-6 of the hexagonal outer peripheral surface 15 a of the outer case 15. That is, as shown in FIG. 5A, when the X axis (the line connecting the apexes 15a-1 and 15a-4 of the hexagonal outer peripheral surface 15a) and the Y axis (the line orthogonal to the X axis) are taken, each apex 15a- 1 to 15a-6, the other top portions 15a-2 to 15a-6 are formed at intervals of 60 ° with respect to the top portion 15a-1 on the X-axis. On the other hand, the key grooves 17-1 to 17-4 are formed at positions of 45 ° with respect to the X and Y axes, respectively. The relationship between the key groove 17 and the seal mechanism 41 will be described in detail later.
[0037]
Next, the retainer 21 will be described.
The retainer 21 is disposed between the retainer receiving portion 16 of the outer case 15 and the lower end of the inner case 12. As easily shown in FIG. 7, the retainer 21 includes a brass arc-shaped member 23 divided into four in the circumferential direction, and an annular rubber 25 that connects the arc-shaped members 23. Each arcuate member 23 is formed with an outer peripheral tapered surface 23A that squeezes toward the center side on the outer peripheral surface on the upper side (the side visible in FIG. 7A).
[0038]
A claw 23b is formed on the inner end surface of each arc-shaped member 23 as shown in FIG. The claw 23b has a shape in which the inner end surface of the arc-shaped member 23 is formed in a semicircular shape. The claw 23b engages with two annular recesses sandwiching a single annular projection on the outer surface of the corrugated tube end. Each arcuate member 23 is formed with a protrusion 23c at the outer peripheral end on the lower side (the side visible in FIG. 7B). When the retainer 21 is disposed, the protrusion 23 c engages with the outside of the protrusion 16 a of the retainer receiving portion 16 of the outer case 15. On the bottom surface of each arc member 23, a rubber groove 23d is dug inside the protrusion 23c. An annular rubber 25 is fitted into the rubber groove 23d of each arc member 23, and the four arc members 23 are connected in a ring shape.
[0039]
Next, the joint body 31 will be described.
The joint body 31 includes a brass connecting nut 32 and a body main body 35 in this example. An upper end portion of the connection nut 32 is a connection portion 32 a that is externally fitted and connected to the outer case 15 of the case 11. A ring groove 32 c is formed on the inner peripheral surface of the connecting portion 32 a of the connecting nut 32. The ring groove 32c faces the ring groove 15c of the outer case 15 in the assembled state. A stop ring 30 is fitted in the ring grooves 32c and 15c of the connecting nut 32 and the outer case 15. By this stop ring 30, the connecting nut 32 and the outer case 15 are connected so as to be relatively rotatable. A female screw 32 b is cut on the inner peripheral surface near the lower end of the connecting nut 32. The female screw 32b is screwed into the male screw 35b of the body main body 35.
[0040]
A male screw 35 b that is screwed into the female screw 32 b of the connecting nut 32 is cut on the outer peripheral surface of the upper end side of the body main body 35. The body main body 35 and the connecting nut 32 have a double structure that can be connected and separated by attaching and detaching the screws 35b and 32b. The outer peripheral surface of the body main body 35 below the male screw 35b is a hexagonal hexagonal outer peripheral surface 35a as shown in FIG. 6A. In the body main body 35, the lower part of the hexagonal outer peripheral surface 35a has a male screw 35c cut, which is a connection part with other pipes.
[0041]
A through hole 36 is formed in the body main body 35 along the axial direction. This through hole 36 is a substantially cylindrical hole with a step, and is roughly divided into an upper inner hole 36a, a middle inner hole 36b, and a lower inner hole 36c having different diameters from the upper side in the axial direction. The upper inner hole 36 a is open on the upper end side of the body main body 35. On the inner peripheral surface of the upper inner hole 36a, as clearly shown in FIG. 6A, key grooves 37 are formed at four locations that are 90 ° apart from each other in the circumferential direction. These key grooves 37 are cut so as to extend in the axial direction from the upper end surface of the body main body 35 to the seating surface of the upper inner hole 36a (boundary step portion between the upper inner hole 36a and the inner inner hole 36b).
[0042]
These four key grooves 37-1 to 37-4 are formed in the following positional relationship with respect to the top portions 35a-1 to 35a-6 of the hexagonal outer peripheral surface 35a of the body main body 35. That is, as shown in FIG. 6A, taking the X axis (the line connecting the apexes 35a-1 and 35a-4 of the hexagonal outer peripheral surface 35a) and the Y axis (the line orthogonal to the X axis), each apex 35a- 1 to 35a-6, the other top portions 35a-2 to 35a-6 are formed at intervals of 60 ° with respect to the top portion 35a-1 on the X-axis. On the other hand, the key grooves 37-1 to 37-4 are formed at intervals of 90 ° on the X and Y axes. The relationship between the key groove 37 and the seal mechanism 41 will be described in detail later.
[0043]
The inner inner hole 36b of the body main body 35 is formed with a smaller diameter than the upper inner hole 36a, and the lower inner hole 36c is formed with a smaller diameter than the middle inner hole 36b. An annular groove 36f into which the O-ring 39 is fitted is formed on the inner peripheral surface of the middle inner hole 36b. The O-ring 39 seals the inner surface of the body main body 35 and the outer surface of the spring receiver 51 of the seal mechanism 41.
[0044]
Next, the seal mechanism 41 will be described.
The spring receiver 51 of the seal mechanism 41 is disposed in the upper inner hole 36a and the inner inner hole 36b of the body main body 35 in a state before the corrugated pipe joint 10 shown in FIG. As shown in FIG. 4 in an easy-to-understand manner, the spring receiver 51 is a cylindrical body, and a flange 53 is formed at the upper end. On the inner side of the flange 53, an annular protrusion 53a protruding inward in the radial direction is formed. The inner diameter of the annular protrusion 53a is substantially equal to the inner diameter of the lower inner hole 36c. A ring-shaped packing 43 is attached to the inner peripheral surface of the flange 53 on the upper surface of the annular protrusion 53a. The upper inner peripheral edge of the packing 43 is chamfered and slightly tapered. The packing 43 seals between the tip of the corrugated tube and the spring receiver 51.
[0045]
A coil spring 45 is disposed inside the spring receiver 51 in the inner inner hole 36b of the body main body 35. The upper end of the coil spring 45 is in contact with the lower surface of the annular protrusion 53 a of the spring receiver 51. On the other hand, the lower end of the coil spring 45 is in contact with the boundary step between the inner inner hole 36b and the lower inner hole 36c of the body main body 35. The elastic force of the coil spring 45 is about 100 N (10 Kgf) in this embodiment. Due to the elastic force of the coil spring 45, the spring receiver 51 is pushed up while sliding upward in the axial direction.
[0046]
On the outer peripheral surface of the flange 53 of the spring receiver 51, as shown in FIG. 4A, keys 57 are formed at four locations that are 90 ° apart from each other in the circumferential direction. These keys 57 are integrally formed so as to protrude outward from the outer peripheral surface of the flange 53.
[0047]
Next, the usage method of the corrugated pipe joint 10 is demonstrated based on FIGS.
First, in the state before construction (before corrugated pipe connection), as shown in FIG. 1 (A), the case 11 and the joint body 31 are in a state where the ridge lines of the respective hexagonal outer peripheral surfaces 15a and 35a are aligned. It is connected with. The spring receiver 51 is accommodated in the upper inner hole 36 a and the inner inner hole 36 b of the body main body 35, and is pushed upward in the axial direction by receiving the elastic force of the coil spring 45. At this time, the key 57 of the spring receiver 51 is engaged with the key groove 37 of the body main body 35, but the key groove 17 of the outer case 15 is shown in FIG. The position is different from the position of the key 57 (position of the key groove 37). Therefore, at this time, since the positions of the key grooves 37 and 17 are shifted in the circumferential direction, the upper end surface of the key 57 of the spring receiver 51 hits the lower end surface of the outer case 15, and the spring receiver 51 is locked in the axial direction. It is in the state.
[0048]
Here, as shown in FIG. 2A, when the corrugated tube T is inserted into the inner hole 13 of the case 11, the tip of the corrugated tube T contacts the arcuate member 23 of the retainer 21. When the corrugated pipe T is further pushed in, the annular rubber 25 of the retainer 21 is bent and each arcuate member 23 is spread. When the corrugated tube T is further pushed in from this state, the foremost annular convex portion T1 on the outer surface of the corrugated tube T is engaged with the concave portion of the claw 23b of each arcuate member 23. The retainer 21 is only fixed to the retainer receiving portion 16 of the outer case 15 and is not fixed. Therefore, by pushing the corrugated tube T further, the three annular convex portions T1 to T1 of the corrugated tube T are pushed. T3 gets over the claw 23b. The corrugated tube T can be pushed in until the tip of the corrugated tube T contacts the packing 43 of the spring receiver 51. In a state where the corrugated pipe T is fully pushed in, the claw 23b of each retainer 21 engages with the annular concave part sandwiching the annular convex part T4 on the outer surface of the corrugated pipe T, and the corrugated pipe T is temporarily stopped and is prevented from coming off. ing.
[0049]
After inserting the corrugated tube T into the joint 10 in this way, the installer rotates the case 11 and the joint body 31 relatively by hand. By this turning operation, as shown in FIG. 3B, the key groove 37 of the body main body 35 and the key groove 17 of the outer case 15 are matched. Then, as shown in FIG. 3A, the spring receiver 51 receiving the elastic force of the coil spring 45 moves upward in the axial direction, and the key 57 of the spring receiver 51 enters the key groove 17 of the outer case 15. .
[0050]
When the spring receiver 51 is pushed up, the packing 43 is strongly pressed against the tip of the corrugated tube T. Thereby, the seal | sticker between the spring receiver 51 and the corrugated pipe T front-end | tip is ensured. The spring force of the coil spring 45 is also transmitted to the corrugated pipe T via the spring receiver 51, and the corrugated pipe T is also pushed up. When the corrugated pipe T is pushed up in this way, the retainer 21 engaged with the corrugated pipe T is also pushed up at the same time, and as shown in FIG. 3A, the inner peripheral tapered surface 12A of the inner case 12 and the retainer 21 The outer peripheral tapered surface 23A comes into contact.
[0051]
At this time, the retainer 21 is pressed from the upper side by the inner peripheral tapered surface 23 </ b> A of the inner case 12 and is pushed up from the lower side by the coil spring 45 through the corrugated pipe T, the packing 43 and the spring receiver 51. Therefore, each arcuate member 23 of the retainer 21 is in a state in which the tapered surface 23 </ b> A slips and narrows inward, and the corrugated tube T is tightened. In this way, the corrugated tube T is strongly fixed by the spring force of the coil spring 45 and is prevented from coming off.
[0052]
As described above, in the connection work using the joint 10, the corrugated pipe T can be inserted into and fixed to the joint 10 by inserting the corrugated pipe T into the case 11 and performing a slight turning operation manually. Therefore, the corrugated tube T can be easily and quickly connected without using a tool such as a pliers or a spanner in a narrow place. Furthermore, the spring force of the coil spring 45 is set to about 100 N (10 Kgf), and a force that cannot be directly pressed by a normal human force is obtained by the spring force. As a result, the pressing force of the packing 43 can be increased more than the manual insertion force, so that the sealing performance can be further improved.
[0053]
After the corrugated pipe T is connected to the joint 10, when the corrugated pipe T is desired to be extracted, the inner case 12 is turned and removed from the outer case 15. At the same time that the inner case 12 is removed, the corrugated pipe T and the retainer 21 fitted on the corrugated pipe T are removed. Thus, the corrugated tube T can be pulled out simply by removing the inner case 12 from the outer case 15.
[0054]
The corrugated pipe joint 10 of the present invention can be reused any number of times by disassembling and assembling. That is, after removing the inner case 12 from the outer case 15 and extracting the corrugated tube T once connected, the body main body 35 is rotated and removed from the connecting nut 32. At the same time as the body main body 35 is removed, the spring receiver 51 and the coil spring 45 of the seal mechanism 41 are also separated from the body main body 35.
[0055]
In order to reassemble the joint 10 thus disassembled into the state shown in FIG. 1A, a jig as shown in FIG. 8 is used.
FIG. 8 is a perspective view showing an example of a jig used when assembling the corrugated pipe joint of the above-described embodiment.
The jig 60 includes a shaft 61, a washer 63, a bolt 65, and a hexagon wrench 67.
[0056]
The shaft 61 has a large diameter part 61a and a small diameter part 61b. The diameter of the large diameter portion 61a is slightly larger than the inner diameter of the annular protrusion 53a of the spring receiver 51 and the lower inner hole 36c of the body main body 35. The diameter of the small diameter portion 61b is slightly smaller than the inner diameter of the annular protrusion 53a of the spring receiver 51 and the lower inner hole 36c of the body main body 35. A screw hole 61c into which the screw portion 65a of the bolt 65 is screwed is formed at the end of the small diameter portion 61b. The washer 63 is a disk having a center hole 63a. The diameter of the center hole 63a is large enough to allow the threaded portion of the bolt 65 to be inserted. A head 65b of the bolt 65 is formed with a hexagon hole 65a into which a hexagon wrench 67 can be engaged.
[0057]
A procedure for assembling the disassembled joint 10 using the jig 60 will be described.
(1) A coil spring 45 is mounted on the inner inner hole 36 b of the body main body 35, and a spring receiver 51 is mounted on the coil spring 45.
(2) Insert the small-diameter portion 61b of the shaft 61 of the jig 60 from the upper side of the spring receiver 51 (the packing 43 side). By inserting the shaft 61, the shaft step portion 61 x of the large diameter portion 61 a and the small diameter portion 61 b hits the annular protrusion 53 a of the spring receiver 51. Further, while pressing the shaft 61 of the jig 60, the spring receiver 51 is pushed in while the coil spring 45 is contracted to some extent.
[0058]
(3) With the coil spring 45 contracted to some extent, the bolt 65 is lightly screwed into the threaded portion 65a of the shaft 61 through the washer 63 from the lower inner hole 36c of the body main body 35. The washer 63 hits the lower surface of the body main body 35.
(4) Turn the bolt 65 with the hexagon wrench 67. As the bolt 65 is turned, the distance between the washer 63 and the shaft step portion 61x is narrowed, and the spring receiver 51 is pushed downward by the shaft step portion 61x. The spring receiver 51 is accommodated in the body main body 35 while the coil spring 45 is contracted. At this time, the positions of both are matched so that the key 57 of the spring receiver 51 is received in the key groove 37 of the body main body 35.
[0059]
(5) Subsequently, the hexagon wrench 67 is removed, and the connecting nut 32 and the outer case 15 connected thereto are inserted from the large diameter portion 61a side of the shaft 61 of the jig 60. Then, the female screw 32 b of the connection nut 32 is screwed into the male screw 35 b of the body main body 35. When the screwing is completed, the body main body 35 and the connecting nut 32 are integrated. The outer case 15 is rotatable with respect to the connecting nut 32.
[0060]
(6) The bolt 65 is turned again using the hexagon wrench 67, and the bolt 65 and the washer 63 are removed from the shaft 61 of the jig 60. At this time, the ridge lines of the hexagonal outer peripheral surfaces 15a and 35a of the case 11 and the joint body 31 so that the key 57 and the key groove 37 and the key groove 17 of the outer case 15 are in the positional relationship of FIG. Are aligned on a straight line. As the bolt 65 is loosened, the spring receiver 51 is pushed toward the outer case 15 by the spring force of the coil spring 45, and the upper end surface of the key 57 of the spring receiver 51 hits the lower end surface of the outer case 15. Due to the friction between them, the outer case 15 is fixed to such an extent that it does not easily rotate with respect to the connecting nut 32.
[0061]
(7) Pull out the shaft 61, place the retainer 21 on the retainer receiving portion 16 of the outer case 15, and screw the inner case 12 into the outer case 15. This completes the assembly. The assembled joint 10 can be used again as described above.
[0062]
In addition to the jig shown in FIG. 8, there is a jig as shown in FIG.
FIG. 13A is a front view showing another example of the jig according to the present invention, and FIG. 13B is a cross-sectional view for explaining an example of use of the jig of FIG.
As shown in FIG. 13A, the jig 70 includes a hexagonal head 73, a screw part 75, and a shaft part 77 in order from the upper end to the lower end.
The outer peripheral surface of the hexagonal head 73 is formed in a hexagonal shape. The screw part 75 below the hexagonal head 73 has a screw 75a formed on the outer peripheral surface. The male screw 75 a is screwed into the female screw 15 b of the outer case 15. A screw-less portion 74 is provided above the male screw 75 a of the screw portion 75. The outer diameter of the shaft portion 77 below the threaded portion 75 is larger than the inner diameter of the annular protrusion 53 a of the spring receiver 51 and smaller than the inner diameter of the packing 43.
[0063]
A method of using the jig 70 will be described.
After removing the inner case 12 from the outer case 15 and extracting the corrugated tube T once connected, a jig 70 is screwed into the outer case 15 as shown in FIG. By screwing the jig 70, the lower end of the shaft portion 77 hits the annular protrusion 53 a of the spring receiver 51. Further, the spring receiver 51 is pushed in while the coil spring 45 is contracted to some extent while the jig 70 is screwed in using, for example, a spanner or a wrench. When the jig 70 is fully screwed, the spring receiver 51 is detached from the outer case 15 and accommodated in the body main body 35. At this time, the outer case 15 and the jig 70 side and the connection nut 32, the body main body 35 and the spring receiver 51 side are in contact between the lower end surface of the shaft portion 77 of the jig 70 and the upper surface of the annular protrusion 53 a of the spring receiver 51. It is in a state of being slightly fixed by the frictional force.
[0064]
Next, against this frictional force, the connecting nut 32 and the body main body 35 are slightly rotated with respect to the outer case 15, and the key 57, the key groove 37, and the key groove 17 of the outer case 15 are shown in FIG. The ridgelines of the hexagonal outer peripheral surfaces 15a and 35a of the case 11 and the joint body 31 are aligned on a straight line so that the positional relationship is satisfied. Finally, the jig 70 is turned and removed from the outer case 15. As the jig 70 is turned and loosened, the spring receiver 51 is pushed toward the outer case 15 by the spring force of the coil spring 45, and the upper end surface of the key 57 of the spring receiver 51 hits the lower end surface of the outer case 15. Due to the friction between them, the outer case 15 is fixed to such an extent that it does not easily rotate with respect to the connecting nut 32.
[0065]
Such a jig 70 only needs to remove the inner case 12 from the outer case 15 and screw the jig 70, and it is not necessary to separate the body main body 35 and the connecting nut 32. Therefore, there is an advantage that the disassembly and assembly work of the joint can be simplified.
[0066]
{Second Example}
The second embodiment of the present invention will be described below with reference to FIGS.
FIG. 14 is a sectional view showing a state before the construction of the corrugated pipe joint according to the second embodiment of the present invention. (A) is side surface sectional drawing, (B) is a top view which shows the engagement positional relationship of a spring guide, (C) is an enlarged view of the engaging part of the spring guide in (A).
FIG. 15 is a cross-sectional view showing a state of the corrugated pipe joint according to the second embodiment of the present invention when the corrugated pipe is inserted. (A) is side surface sectional drawing, (B) is a top view which shows the engagement positional relationship of a spring guide, (C) is an enlarged view of the engaging part of the spring guide in (A).
FIG. 16: is sectional drawing which shows the state at the time of completion of construction of the corrugated pipe joint which concerns on 2nd Example of this invention. (A) is side surface sectional drawing, (B) is a top view which shows the engagement positional relationship of a spring guide, (C) is an enlarged view of the engaging part of the spring guide in (A).
[0067]
FIG. 17A is a plan view showing details of the spring guide (lower) of the corrugated pipe joint of FIGS. 14 to 16, and FIG. 17B is a cross-sectional view of the guide.
FIG. 18A is a plan view showing details of the spring guide (upper) of the corrugated pipe joint of FIGS. 14 to 16, and FIG. 18B is a cross-sectional view of the guide.
FIG. 19 is a perspective view showing an assembled state of the spring guide of FIGS. 17 and 18.
Note that in the following description, the vertical direction refers to the vertical direction in FIGS. 14A, 15A, and 16A unless otherwise specified.
[0068]
The corrugated pipe joint 200 of the second embodiment differs from the corrugated pipe joint 1 of the first embodiment in the structure of the outer case 215, the joint body 231 and the seal mechanism 241. About the inner case 12 and the retainer 21, since it is the same structure as what was described in 1st Example, it represents with the same code | symbol and simplified description.
[0069]
First, the outer case 215 will be described.
The outer case 215 is made of brass (an example) and constitutes the case 211 together with the inner case 12. As for the outer peripheral surface of the outer case 215, the upper end side 215a has a hexagonal shape, and the lower end side 215c has a straight shape. An upper female screw 215 b that is screwed into the male screw 12 b of the inner case 12 is cut on the inner peripheral surface on the upper end side of the outer case 215. The outer case 215 and the inner case 12 have a double structure that can be connected and separated by attaching and detaching the screws 215b and 12b. On the other hand, a lower female screw 215 d that is screwed into the upper male screw 231 a of the joint body 231 is cut on the inner peripheral surface on the lower end side of the outer case 215. The outer case 215 and the joint body 231 have a double structure that can be connected and separated by attaching and detaching the screws 215d and 231a.
[0070]
A retainer receiving portion 216 is formed inside the outer case 215 so as to project inward between the upper and lower female screws 215b and 215d. A protrusion 216 a protruding upward is formed on the end edge of the retainer receiving portion 216. A retainer 21 is disposed between the retainer receiving portion 216 and the lower end of the inner case 12.
[0071]
Next, the joint body 231 will be described.
The joint body 231 is made of steel (an example). The outer peripheral surface of the joint body 231 is an upper male screw 231a, a straight surface 231b, a hexagon outer peripheral surface 231c, and a lower male screw 231d in order from the upper side in the axial direction. The upper male screw 231a is screwed into the lower female screw 215d of the outer case 215. The lower male screw 231d is a connection part with other piping.
[0072]
A through hole 236 is formed in the joint body 231 along the axial direction. The through hole 236 includes an upper inner hole portion 236A on the upper end side and a lower inner hole portion 236B on the lower end side. The upper inner hole portion 236A has a larger diameter than the lower inner hole portion 236B. A protruding portion 237 that protrudes inward is formed at the lower end of the upper inner hole portion 236A. An annular tapered protrusion 237a protruding upward is formed on the end edge of the overhang portion 237. The taper protrusion 237a is formed so as to sag inwardly upward. A step portion 236C exists at a boundary portion between the overhang portion 237 and the lower inner hole portion 236B.
[0073]
Next, the seal mechanism 241 will be described.
The seal mechanism 241 is disposed in the upper inner hole 236A of the joint body 231. The seal mechanism 241 includes a spring unit 250 including three parts: a spring guide (lower) 251, a spring guide (upper) 253, and a coil spring 255. The spring guide (lower) 251 of the spring unit 250 is disposed on the step portion 236C of the joint body 231 through a ring-shaped spacer 247 made of NBR (one example). The spring guide (lower) 251 is a bottomed cylindrical body made of stainless steel (an example), as easily shown in FIG. The outer diameter of the spring guide (lower) 251 is slightly smaller than the inner diameter of the overhang portion 237 of the joint body 231. The inner diameter of the annular bottom 251b at the lower end of the spring guide (lower) 251 is slightly larger than the inner diameter of the lower inner hole 236B of the joint body 231. On the outer surface of the spring guide (lower) 251, an annular protrusion 251a protruding outward is formed. The annular protrusion 251a can be engaged with a ring groove 253a of a spring guide (upper) 253 described later. The upper edge of the annular protrusion 251a is chamfered and smooth.
[0074]
The spring guide (upper) 253 is fitted from the upper side of the spring guide (lower) 251 (see FIG. 19). The spring guide (upper) 253 is a cylindrical body (one example) made of nylon as shown in FIG. The outer diameter of the spring guide (upper) 253 is smaller than the inner diameter of the upper inner hole 236A of the joint body 231. The spring guide (upper) 253 is formed with a slit 254 extending in the axial direction from the lower end. A plurality (six in this example) of slits 254 are formed at equal intervals in the guide circumferential direction. A segment 256 is formed between the slits 254. The inner side of the lower end of each segment 256 is chamfered and smooth. On the inner surface near the lower end of each segment 256, a ring groove 253a is formed along the guide circumferential direction. The ring groove 253a can be engaged with the annular protrusion 251a of the spring guide (lower) 251. At the upper end of the spring guide (upper) 253, an annular ceiling portion 253b projecting inward is formed.
[0075]
The coil spring 255 is disposed inside the spring guide (lower) 251. The upper end of the coil spring 255 is in contact with the lower surface of the annular top 253b of the spring guide (upper) 253, and the lower end is in contact with the upper surface of the annular bottom 251b of the spring guide (lower) 251. The coil spring 255 biases the spring guide (lower) 251 and the spring guide (upper) 253 away from each other. The elastic force of the coil spring 255 is about 100 N (10 Kgf) in this embodiment.
[0076]
On the upper side of the spring unit 250 having such a configuration, a packing 243 is disposed via a ring-shaped packing guide 244 made of steel (one example). The packing 243 is a cylindrical body made of NBR (an example). The inner diameters of the packing 243 and the packing guide 244 are larger than the inner diameter of the annular top 253b at the upper end of the spring guide (upper) 253. The outer peripheral surface of the packing 243 is in close contact with the inner peripheral surface of the upper inner hole 236A of the joint body 231, and the upper end surface thereof is in close contact with the lower surface of the retainer receiving portion 216 of the outer case 215.
[0077]
Next, the usage method of the corrugated pipe joint 200 is demonstrated based on FIGS.
First, before construction, the corrugated pipe joint 200 is in a set state as shown in FIG. At this time, the spring unit 250 of the seal mechanism 241 includes a ring groove 253a of the spring guide (upper) 253 and an annular protrusion 251a of the spring guide (lower) 251 as shown in FIGS. 14 (B) and 14 (C). The coil spring 255 is contracted and accommodated inside (see also FIG. 19). At this time, in the spring unit 250, the spring guide (lower) 251 is disposed on the stepped portion 236C of the joint body 231 via the spacer 247, and the lower end edge of the segment 256 of the spring guide (upper) 253 is the protruding portion. 237 is in contact with the upper end of the taper protrusion 237a.
[0078]
When the corrugated tube T is inserted into the inner hole 13 of the case 211 from this set state, the tip of the corrugated tube T contacts the arcuate member 23 of the retainer 21. When the corrugated pipe T is further pushed in, the retainer 21 is deformed in the same manner as in the first embodiment, and gets over the claw 23b of the retainer 21 in order from the previous annular convex portion T1 of the corrugated pipe T. Then, as shown in FIG. 15A, when the fourth annular convex portion T4 at the tip of the corrugated tube T gets over the claw 23b of the retainer 21, the tip of the corrugated tube T passes through the packing 243 and springs. It hits the upper end of the spring guide (upper) 253 of the unit 250. When the tip of the corrugated tube T comes into contact with the upper end of the spring guide (upper) 253, as shown in FIGS. 15A to 15C, the ring groove 253a of the spring guide (upper) 253 and the spring guide (lower) ) It remains engaged with the annular protrusion 251a of 251.
[0079]
After the tip of the corrugated tube T hits the upper end of the spring guide (upper) 253, when the spring guide (upper) 253 is pushed downward by the tip of the corrugated tube T, as shown by a two-dot chain line in FIG. The lower end of the segment 256 of the spring guide (upper) 253 contacts the tapered surface of the tapered protrusion 237a of the joint body overhanging portion 237. At the same time, the spring 255 and the spring guide (lower) 251 are pushed downward, and the spacer 247 contracts. Then, the downward movement of the spring guide (lower) 251 at this time is absorbed by the crushing deformation of the spacer 247. When the corrugated tube T is further pushed in from this state, the spring guide (upper) 253 expands with the segments 256 deformed in the radial direction with the cut end portion of the slit 254 as a fulcrum. The expansion deformation of the segment 256 is performed in the upper inner hole portion 236A of the joint body 231.
[0080]
When the segment 256 is sufficiently expanded as the corrugated pipe T is pushed in, the engagement between the annular protrusion 251a of the spring guide (lower) 251 and the ring groove 253a of the spring guide (upper) 253 is released. Then, as shown in FIGS. 16A to 16C, the coil spring 255 extends to separate the spring guide (lower) 251 and the spring guide (upper) 253 from each other. That is, by the biasing force of the coil spring 255, the spring guide (lower) 251 is pushed downward, and the spring guide (upper) 253 is pushed upward.
[0081]
When the spring guide (upper) 253 is pushed upward, the packing guide 244 and the corrugated pipe T are also pushed upward simultaneously. When the packing guide 244 is pushed upward, the packing 243 is contracted in the inner diameter direction and strongly pressed against the outer surface of the corrugated tube T. On the other hand, when the corrugated tube T is pushed, the retainer 21 operates in the same manner as in the first embodiment to tighten the outer surface of the annular convex portion T5 of the corrugated tube T. Thus, the outer surface of the corrugated tube T is sealed by the packing 243, and the corrugated tube T is firmly fixed by the retainer 21 and is prevented from coming off.
[0082]
Thus, even in the connection work using the corrugated pipe joint 200 of the second embodiment, the connection work of the corrugated pipe T can be easily and quickly performed without using a tool such as a pliers or a spanner. Further, similarly to the first embodiment, the spring force of the coil spring 255 is set to about 100 N (10 Kgf), and a force that cannot be directly pressed by a normal human force is obtained by the spring force. Therefore, also in this case, the sealing performance can be further improved.
[0083]
The corrugated pipe joint 200 of the second embodiment can be reused any number of times by disassembling and assembling. That is, in order to disassemble after construction, the inner case 12 is removed from the outer case 215, the corrugated pipe T once connected is extracted, and then the outer case 215 is removed from the joint body 231. When the outer case 215 is removed, each component of the seal mechanism 241 can be removed in a separated state.
[0084]
In order to reassemble the joint 200 thus disassembled into the set state shown in FIG. 14A, first, the spring unit 250 is assembled as shown in FIG. That is, one of the spring guide (lower) 251 and the spring guide (upper) 253 is pushed into the other while the coil spring 255 is accommodated inside. Then, the chamfered portion at the lower end of the spring guide (upper) 253 slides against the chamfered portion at the upper end of the annular protrusion 251 a of the spring guide (lower) 251, and the segment with the cut end of the slit 254 of the spring guide (upper) 253 as a fulcrum Each 256 is deformed and expanded in the radial direction. When the push-in is continued further, the lower end of the spring guide (upper) 253 gets over the annular protrusion 251a of the spring guide (lower) 251 and the annular protrusion 251a and the ring groove 253a are engaged. Thus, the assembly of the spring unit 250 is completed.
[0085]
Then, the seal mechanism 241 is accommodated in the upper inner hole 236A of the joint body 231 in the order of the spacer 247, the spring unit 250, the packing guide 244, and the packing 243. On the other hand, the inner and outer cases 12, 215 and the retainer 21 are assembled to form the case 211, and finally the outer case 215 and the joint body 231 are connected. Thus, the assembly of the joint 200 is completed.
[0086]
【The invention's effect】
As described above, according to the present invention, connection work can be performed even in a narrow place without using a spanner or a wrench.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state before construction of a corrugated pipe joint according to a first embodiment of the present invention. (A) is side sectional drawing, (B) is a top view which shows the engagement positional relationship of a key and a key groove.
FIG. 2 is a cross-sectional view showing a state of the corrugated pipe joint according to the first embodiment of the present invention when the corrugated pipe is inserted. (A) is side sectional drawing, (B) is a top view which shows the engagement positional relationship of a key and a key groove.
FIG. 3 is a cross-sectional view showing a state when the construction of the corrugated pipe joint according to the first embodiment of the present invention is completed. (A) is side sectional drawing, (B) is a top view which shows the engagement positional relationship of a key and a key groove.
4 (A) is a plan view showing details of a spring receiver of the corrugated pipe joint of FIGS. 1 to 3, and FIG. 4 (B) is a cross-sectional view of the spring receiver.
5A is a plan view of the outer case of the corrugated pipe joint of FIGS. 1 to 3 as viewed from below, and FIG. 5B is a cross-sectional view of the outer case.
6A is a plan view of the body body of the corrugated pipe joint of FIGS. 1 to 3 as viewed from above, and FIG. 6B is a cross-sectional view of the body body.
7A is a view of the retainer of the corrugated pipe joint of FIGS. 1 to 3 as viewed from above, and FIG. 7B is a view of the retainer as viewed from below. (C) is a perspective view of the retainer.
FIG. 8 is a perspective view showing an example of a jig used when assembling the corrugated pipe joint of the present invention.
FIG. 9 is a cross-sectional view showing a conventional joint after being fastened (corrugated pipe connection state).
FIG. 10 is a cross-sectional view showing a corrugated tube provisional insertion state of a conventional joint.
11A is a perspective view of a retainer, FIG. 11B is a view for explaining expansion deformation of the retainer when the corrugated pipe is inserted, and FIG. 11C is a diagram showing that the concave part of the corrugated pipe is engaged with the retainer. It is a figure explaining a state.
FIG. 12 is a diagram schematically showing an example of gas piping in a building.
13A is a front view showing another example of the jig according to the present invention, and FIG. 13B is a cross-sectional view for explaining an example of use of the jig shown in FIG. 13A. FIG.
FIG. 14 is a cross-sectional view showing a state before construction of a corrugated pipe joint according to a second embodiment of the present invention. (A) is side surface sectional drawing, (B) is a top view which shows the engagement positional relationship of a spring guide, (C) is an enlarged view of the engaging part of the spring guide in (A).
FIG. 15 is a cross-sectional view showing a state in which a corrugated pipe joint according to a second embodiment of the present invention is inserted. (A) is side surface sectional drawing, (B) is a top view which shows the engagement positional relationship of a spring guide, (C) is an enlarged view of the engaging part of the spring guide in (A).
FIG. 16 is a cross-sectional view showing a state when the construction of the corrugated pipe joint according to the second embodiment of the present invention is completed. (A) is side surface sectional drawing, (B) is a top view which shows the engagement positional relationship of a spring guide, (C) is an enlarged view of the engaging part of the spring guide in (A).
17A is a plan view showing details of a spring guide (lower) of the corrugated pipe joint of FIGS. 14 to 16, and FIG. 17B is a cross-sectional view of the guide.
18A is a plan view showing details of the spring guide (upper) of the corrugated pipe joint of FIGS. 14 to 16, and FIG. 18B is a sectional view of the guide.
19 is a perspective view showing an assembled state of the spring guide of FIGS. 17 and 18. FIG.
[Explanation of symbols]
10 Corrugated fitting
11 Case 12 Inner case
12A Inner peripheral taper surface 12b Male thread
13 Inner hole 15 Outer case
15a Hexagonal outer surface 15a-1 to 15a-6 Top
15b Female thread 16 Retainer receiving part
17 (17-1 to 17-4) Keyway
21 Retainer
23 arc-shaped member 23A outer peripheral taper surface
23b Claw 25 Ring rubber
30 Stop ring
31 Joint body
32 connecting nut 32a connecting part
32b Female thread 35 Body body
35a Hexagonal outer surface 35a-1 to 35a-6 Top
35b Male thread 36a Upper inner hole
36b Middle inner hole 36c Lower inner hole
37 (37-1 to 37-4) Keyway
41 Sealing mechanism
43 Packing 45 Coil spring
51 Spring support 53 Flange
53a Annular protrusion 57 key
60, 70 jig
61 Shaft 63 Washer
65 bolt 67 hex wrench
73 Hex head 75 Screw part
75a Male thread 77 Shaft
200 corrugated fitting
211 Case 215 Outer case
215b female screw 215d female screw
216 Retainer receiving part
231 Joint body
231a Upper male screw 231d Lower male screw
236 Through hole 236A Upper inner hole
236B Lower inner hole portion 236C Step portion
237 Overhang portion 237a Taper protrusion
241 Seal mechanism
243 Packing 244 Packing guide
247 Spacer 250 Spring unit
251 Spring guide (bottom) 251a Annular projection
253 Spring guide (upper) 253a Ring groove
254 Slit 255 Coil spring
256 segments

Claims (15)

A corrugated joint for a corrugated tube having a bellows-like annular irregularity formed on the outer surface;
A case having an inner hole into which the corrugated tube end is inserted;
A retainer having a claw disposed in the annular recess on the outer surface of the corrugated pipe disposed in the inner hole;
A joint body connected to the case and having a connection with another pipe;
Sealing means for sealing between the corrugated pipe and the joint body;
Comprising
The sealing means has a packing pressed against the end of the corrugated pipe, and a spring that presses the packing,
Before construction, the spring is preliminarily contracted, and a spring biasing force expression mechanism is provided that extends the spring and presses the packing against the end of the corrugated pipe according to the manual operation of the installer after the corrugated pipe is inserted. Characteristic corrugated fitting.   The corrugated pipe joint according to claim 1, wherein the force by which the spring pushes the packing is stronger than the force by which an operator pushes the corrugated pipe by hand. As the spring urging force expression mechanism,
A spring receiver for transmitting the force of the spring to the packing;
A mechanism for locking the spring receiver so as not to move at a position on the joint body side, and a mechanism for releasing the lock so that the spring receiver can move to the case side;
The corrugated pipe joint according to claim 1 or 2, characterized by comprising:   4. The corrugated pipe joint according to claim 3, wherein means for sliding in the axial direction and not rotating in the circumferential direction are provided between the spring receiver and the joint body. The case and the joint body are rotatably connected.
The joint body side end of the case is provided with a receiving means capable of receiving a means that can slide in the axial direction and cannot rotate in the circumferential direction,
5. The corrugated pipe joint according to claim 4, wherein the spring receiver is locked and unlocked by selecting a relative rotational position of the case and the body.   3. A corrugated pipe joint according to claim 1, further comprising a jig for shrinking the spring. An outer peripheral tapered surface that swells toward the case side is formed on the outer peripheral surface of the retainer,
An inner peripheral taper surface with which the outer peripheral taper surface abuts the case is formed,
2. The corrugated pipe and the retainer are pushed toward the case by the biasing force of the spring, and the inner diameter of the retainer is reduced by the abutment of both the tapered surfaces and pressed against the corrugated pipe. Corrugated fitting.   8. The corrugated pipe joint according to claim 7, wherein the retainer includes a plurality of arc-shaped members having the claws and an elastic member that connects them in a ring shape. The case consists of two parts that can be disassembled,
The inner peripheral tapered surface is formed on one of the parts,
8. The corrugated pipe joint according to claim 7, further comprising means that is slidable in the axial direction and that is not rotatable in the circumferential direction, which forms part of the spring biasing force expression mechanism. The joint body is composed of two parts that can be disassembled, and one of the parts is formed with a connecting part rotatably connected to the case via a stop ring,
4. The corrugated pipe joint according to claim 3, further comprising: a housing portion for housing the spring receiver so as not to rotate in the circumferential direction and to be slidable in the axial direction. A corrugated joint for a corrugated pipe having an accordion-like annular irregularity formed on the outer surface;
A case having an inner hole into which the corrugated tube end is inserted;
A retainer having a claw disposed in the annular recess on the outer surface of the corrugated pipe disposed in the inner hole;
A joint body connected to the case and having a connection with another pipe;
Sealing means for sealing between the corrugated pipe and the joint body;
Comprising
An outer peripheral tapered surface that swells toward the case side is formed on the outer peripheral surface of the retainer,
An inner peripheral taper surface with which the outer peripheral taper surface abuts the case is formed,
Furthermore, urging means for pressing the corrugated pipe and the retainer to the case side is provided,
The inner diameter of the retainer is reduced by the contact of both tapered surfaces and pressed against the corrugated pipe,
The sealing means has a packing pressed against the outer surface of the corrugated pipe, and a spring that presses the packing,
Before installation the advance shorten the spring, features and to Turkey Rugate further comprising a spring biasing force release mechanism which stretch the spring pressing the packing to the corrugated pipe the outer surface depending on the insertion force of the corrugated pipe Pipe fittings.   The corrugated pipe joint according to claim 11, further comprising a mechanism for aligning the axis of the case with the axis of the retainer.   13. The biasing means includes a spring and a spring biasing force release mechanism that contracts the spring in advance before construction and extends the spring according to the insertion force of the corrugated pipe. Corrugated pipe joint as described. As the spring biasing force release mechanism, a guide for transmitting the spring force to the packing or the corrugated pipe joint is locked, and the guide is locked so as not to move at a position on the joint body side, and the guide is moved to the case side. claim 1 2 or 1 3 corrugated pipe joint wherein a having a mechanism for unlocking so as to be movable. Corrugated pipe joint according to claim 1 4, wherein the unlocking by pushing the guide above corrugated tube.

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