JP2002257273A - Joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint capable of reducing slack of a pressing ring against a main body in a permanent fastening condition, and easily and quickly determining whether the pressing ring is temporarily fastened or permanently fastened to the body. SOLUTION: A joint body 12 is constructed of a substantially cylindrical body 13 and the substantially cylindrical pressing ring 14 screwed to the body 13, and a flat part 51 is arranged, in the base end part of a second external thread part 34 threaded in the pressing ring 14. On the flat part 51, a locking flange 52 is projected. In the temporary fastening condition, in which the pressing ring 14 is manually fastened to the body 13, a locking flange 52 prevents the pressing ring 14 from spirally entering the body 13. In the permanent fastening condition, in which the pressing ring 14 is fastened to the body 13 by means of a wrench, the locking flange 42 is deformed and locked on the inner circumferential face of the body 13, so that the pressing ring 14 is prevented from spirally retracting from the body 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for water supply piping, hot water piping, floor heating, road heating, and the like.

[0002]

Conventionally, the joint as described above is formed in a cylindrical shape, a body pipe can be inserted therein, a tubular shape,
It is composed of a press wheel to be screwed to one end of the body. A restricting member such as a lock ring is disposed inside the main body to restrict the inserted pipe from coming off, and the restricting member is positioned in the main body by a pressing ring screwed to the main body. It is fixed.

[0003] After the regulating member is accommodated in the main body, the joint is conveyed or the like in a temporarily tightened state in which a push ring is screwed into the main body with a weak force of an operator's hand. At the work site, first, the joint in the temporarily tightened state is screwed into a pipe such as a water pipe or the like, and then, by using a working tool, for example, a wrench or the like, the pressing ring is screwed against the main body with a strong force. Are combined.
This state is the final tightening state, and in the joint in the final tightening state, the restricting means is securely positioned and fixed inside the main body. After that, the pipe is inserted into the joint, and the removal of the pipe is restricted by the positioning and fixed restricting means.

[0004]

However, in this conventional joint, if the push ring is not screwed into the main body more than a certain degree in the temporarily tightened state, the push ring loosened by external force such as vibration or impact is detached from the main body. Will be done. Therefore, in the joint in the temporarily tightened state, the pressing ring is screwed to the main body until a state in which almost no gap is formed therebetween. For this reason, the operator cannot easily determine whether the joint is in the temporarily tightened state or the final tightened state, and may attach a pipe to the temporarily tightened state of the joint.

In this case, since the push ring is not securely screwed to the main body of the joint in the temporarily tightened state, the push ring is loosened by an external force such as vibration or impact after the pipe is attached to the joint. There has been a problem that a problem such as detachment of the push ring from the main body and leakage of water between the push ring and the main body may occur. In addition, as a checking operation to prevent such a problem, the operator must perform an operation such as retightening the pressing wheel to the fully tightened joint, and such an checking operation is complicated. There was also a problem that it is.

The present invention has been made by focusing on the problems existing in the prior art as described above. And has an object, it is possible to suppress loosening of the press wheel relative to the body in the clamped state, or easily and quickly wheel pressing against the body is or is tightened state provisionally clamped state It is to provide a joint that can be determined.

[0007]

In order to achieve the above object, a joint invention according to the first aspect of the present invention has a cylindrical body, into which a pipe can be inserted, and a body disposed inside the body. A regulating means for engaging the outer peripheral surface of the pipe to be inserted and restricting the pipe from coming out of the main body, and a push ring screwed into the main body and positioning and fixing the restricting means in the main body, wherein the press wheels or the proximal end of the male screw portion formed on the outer peripheral surface of the main body is provided on the entire circumference of the wheel or body pressing flat portion,
On the flat part, a locking projection is projected so that its height is higher than the thread of the male screw part, and the pressing ring is tightened against the main body with a force that does not deform the locking protrusion In the above, the locking projections restrict the screwing of the push ring into the main body, a gap is formed between the pressing ring and the main body, and the pressing ring is tightened against the main body with a force enough to deform the locking projection. In the fully tightened state, the locking projections restrict the screw ring from retreating with respect to the main body, so that the pressing ring and the main body are substantially brought into contact with each other.

[0008] The invention of the joint described in claim 2 is based on claim 1.
In the invention described in (1), the locking projection is an annular projection provided on the entire periphery of the flat portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 3B, the pipe 11 is
It is formed into a cylindrical shape with a synthetic resin such as polyolefin (cross-linked polyethylene, polybutene, etc.), and is used for water pipes and the like. The joint body 12 has a substantially cylindrical body 13 made of a metal such as an alloy (brass, bronze, etc.) and a substantially cylindrical body made of a metal, such as an alloy (brass, bronze, etc.), and is screwed to the body 13. And a press wheel 14.

[0011] The outer peripheral surface of the proximal end portion shown in FIG. 3 (b) in the right side body 13 is formed first male threaded portion 15, are enabled tube screwed water pipes and the like. A nut 16 is formed on the outer peripheral surface of the distal end of the main body 13. The screwing of the main body 13 and the tubular body and the release thereof are easily performed by engaging a work tool, for example, a spanner with the outer peripheral surface of the nut portion 16 and rotating the main body 13.

As shown in FIG. 1 and FIG. 2, a first female screw 1
7 are formed. The middle section of the main 13 abutting surface 1
8 is provided in an annular shape so as to be orthogonal to the axis of the main body 13, and when the pipe 11 is inserted into the joint main body 12, the insertion of the pipe 11 is regulated at a predetermined position. From the contact surface 18 to the inside of the base end of the main body 13,
9 is provided, and when the main body 13 is screwed into the tube, a liquid as a transport fluid flows in the introduction path 19.

On the outer peripheral surface of the base end of the main body 13, the first
The pipe 1 is located on the distal end side of the main body 13 with respect to the male screw portion 15.
An indication groove 20 is provided as a confirmation means for indicating a predetermined insertion depth into the joint body 12 of the first embodiment. This display groove 20
Is formed by cutting over the entire outer peripheral surface so as to be orthogonal to the axis of the main body 13. The display groove 20 forms a cross-section substantially V-shaped, its deepest portion 21 is positioned on the extension of the abutment surface 18.

[0014] inside the main body 13, a pair of lock ring 22 as the regulating means for preventing the escape from the fitting body 12 within the pipe 11 is disposed. The two lock rings 22 project from the base ring 23 in the same length as a base ring 23 made of a metal such as stainless steel, and extend in the direction of insertion of the pipe 11 toward the inside of the base ring 23. A plurality of inclined restricting pieces 2
4. A metal spacer 25 such as stainless steel is interposed between the lock rings 22. The width of this spacer 25 is
2 corresponds to the width of the base ring 23.

On the inner peripheral surface of the intermediate portion of the main body 13, there is formed an annular inclined surface 26 whose diameter increases toward the first female screw portion 17 and inclines outward. A receiving surface 27 with which the base ring 23 of the lock ring 22 abuts is formed in an annular shape on the inner peripheral surface on the distal end side of the main body 13 with respect to the inclined surface 26 so as to be orthogonal to the axis of the main body 13. Of the pair of lock rings 22, the lock ring 22 located on the base end side of the main body 13 has its base ring 23
7 and both restricting pieces 24 are
Are arranged so as to have a gap between them.

On the inner peripheral surface of the main body 13, between the contact surface 18 and the inclined surface 26, a first groove 28 and a second groove 29 extend in the circumferential direction from the base end side of the main body 13 in order. It is recessed as follows. A seal ring 30 having a circular cross section as a seal member is fitted into each of the first groove portion 28 and the second groove portion 29, and the outer peripheral surface of the pipe 11 inserted into the joint main body 12 and the inner peripheral surface of the main body 13. It is designed to seal between.

As shown in FIG. 1, FIG. 2 and FIG.
The press ring 14 includes a cylindrical tubular portion 31 and a main body 13.
Grip 32 formed smaller than the outer diameter of the nut 16
It is more configuration and. An insertion hole 33 for inserting the pipe 11 through the cylindrical portion 31 and the grip portion 32 is formed at the center of the push ring 14. In addition, a second male screw portion 34 is formed on the outer peripheral surface of the cylindrical portion 31, and the main body 13 is formed.
The first has to be screwed and the internal thread portion 17 of the. Gripping part 3
A pair of locking portions 35 are cut out at the outer periphery of the end portion 2 at positions facing each other. These locking portions 35 include the main body 13.
Wrench is adapted to be engaged in performing screwing or decouple the wheel 14 pushing against.

On the outer peripheral surface of the push ring 14, a flat portion 51 is formed by cutting over the entire circumference of the cylindrical portion 31 at the base end of the second external thread portion 34 which is a boundary between the cylindrical portion 31 and the grip portion 32. Is formed. A locking flange 52 as a locking projection is provided on the flat portion 51 so as to protrude in an annular shape so as to extend over the entire circumference of the flat portion 51. This locking flange 52
When the flat portion 51 is formed by cutting, the flat portion 51 is formed into a thin plate by performing cutting so as to leave this portion, and is suspended on the flat portion 51. In addition, an annular guide surface 53 is formed at the distal end of the first female screw portion 17 so as to increase in diameter toward the distal end of the main body 13 and incline outward.

As shown in FIG. 1, the push ring 14 is
When screwing into the cylindrical portion 31 with a weak force, for example,
Is screwed into the main body 13, and the locking flange 52 remains in a state of being suspended on the flat portion 51 without bending.
It is in contact with the guide surface 53 from the side. This state is a temporary fastening state. In this temporarily tightened state, the locking flange 52
Contact of the cylindrical portion 31 of the press ring 14 with the main body 13 by the contact of the
A gap 54 is formed between the body 2 and the main body 13. The flat portion 51 can be visually recognized from the gap 54.

As shown in FIG. 2, the push ring 14 is
When screwing the tubular portion 31 into the main body 13 with a strong force using a spanner when screwing into the
As a result, it is bent while being guided toward the grip portion 32. By contacting the outer peripheral edge of the bent locking flange 52 with the inner end surface 32a of the grip portion 32, the bent locking flange 52 is prevented from bending further, and maintains a tapered shape in which the diameter increases toward the inner end surface 32a. Supported in state. This state is the final tightening state. In this tightened condition, the inner peripheral surface of the locking flange 52 body 13 the corner portion of the outer peripheral surface thereof, for example, the guide surface 53 causes bite into such first female threaded portion 17, by being engaged, with respect to the body 13 Retraction of the cylindrical portion 31 of the push wheel 14 is restricted. Further, in the fully tightened state, the grip portion 32 of the press ring 14 has an inner end surface 32 a substantially in contact with the distal end surface of the main body 13.
A gap is not formed between the main body 13 and the main body 13.

The above-mentioned locking flange 52 does not deform when screwing the push ring 14 to the main body 13 by hand, and has a predetermined strength enough to maintain the strength of deformation when tightening with a spanner. It is preferable to set the thickness. When the locking flange 52 is thinner than a predetermined thickness, the locking flange 52 is bent even if the pressing ring 14 is manually tightened, so that it is difficult to determine the temporary tightening state and the final tightening state of the pressing ring 14 with respect to the main body 13. If it is thick, it is difficult to make it in the final tightening state.

Further, the locking flange 52 is set to high so as a predetermined height slightly larger than the thread 34a of the second male threaded portion 34. This predetermined height, so as not to contact the front end surface of the main body 13, i.e. to the extent that its upper portion when screwing the ring 14 pressed into the main body 13 is brought into contact with the guide surface 53 is the inner circumferential surface of the main body 13 It is preferable to set. If the locking flange 52 is lower than a predetermined height, the locking flange 5
2 are not deformed, less likely to restrict the retraction screw push wheel 14 relative to the body 13, is higher, the locking flange 52 body 1
There is a possibility that the pressing wheel 14 is hardly brought into the final tightening state by being sandwiched between the gripping portion 3 and the grip portion 32.

Further, the locking flange 52 has a flat portion 51.
In the above, it is preferable to provide the deformed state at a predetermined position such that only the outer peripheral edge of the flat portion 51 is in contact with the inner end surface 32 a of the grip portion 32 of the press ring 14 without falling over the flat portion 51. When the locking flange 52 is provided on the flat portion 51 on the second male screw portion 34 side from the predetermined position, the entire locking flange 52 falls down on the flat portion 51, and the locking flange 52 is guided by the guide surface 53. There is a possibility that the first female screw portion 17 or the like will not be locked. When the locking flange 52 is provided closer to the grip portion 32 than the predetermined position,
There is a possibility that the locking flange 52 is sandwiched between the main body 13 and the grip portion 32 and a gap is formed.

[0024] As shown in FIGS. 3 to 5, in-core 36
Includes an insertion tube portion 37 which forms an alloy (brass or bronze) or the like of a metal cylindrical, the annular flange portion 38. extending outwardly so as to be perpendicular to the insertion cylinder portion 37 at one end It is configured. The length of the in-core 36 in the longitudinal direction is the same as the length from the contact surface 18 of the joint body 12 to the end surface of the press ring 14. The insertion tube 37 is inserted into the end of the pipe 11 so as to prevent the pipe 11 from being deformed inward due to heat or the like. The outer peripheral surface 39 on the other end side of the insertion tube portion 37 is formed in a tapered surface shape whose diameter decreases toward the end portion, so that the in-core 36 can be easily inserted into the pipe 11.

Next, a description will be given of the operation of the configured coupling as described above. Now, in order to assemble the joint main body 12, a pair of lock rings 22 with a spacer 25 interposed therein are first inserted into the main body 13, and the pressing ring 14 is tightened to the main body 13 with a weak force by an operator's hand. Then, as shown in FIG. 1, when the cylindrical portion 31 of the push ring 14 is screwed into the main body 13 by a predetermined amount, the locking flange 52 comes into contact with the guide surface 53 from the side. At this time, the locking flange 52 cannot be bent by a weak force of the operator's hand,
Further screwing of the cylindrical portion 31 of the push ring 14 into the press ring 3 is restricted, and the joint body 12 is temporarily tightened. And
The operator confirms that the joint main body 12 is in the temporarily tightened state by visually recognizing the flat portion 51 from the gap 54 formed between the grip portion 32 of the push ring 14 and the main body 13.
In this state, the first male screw 15 of the main body 13 is screwed into a pipe such as a water pipe, and the nut 16 is tightened with a spanner.
By tightening, the body 13 is fixed. Then, the joint main body 12 is brought into the final tightening state.

In order to bring the joint body 12 into the fully tightened state, first, a wrench is engaged with the grip portion 32 of the push ring 14 and the push ring 1
4 tighten with a strong force to the body 13. Then, in accordance with the screwing of the cylindrical portion 31 into the main body 13, the locking flange 52 is bent so that the outer peripheral edge portion approaches the inner end surface 32 a of the grip portion 32 while being entirely guided by the guide surface 53 by external force. . Eventually, as shown in FIG.
2 comes into contact with the inner end surface 32a of the grip portion 32, the locking flange 52 moves the corner of the outer peripheral surface to the guide surface 5a.
3. The joint body 12 is locked to the first female screw portion 17 and the like, and the joint main body 12 is in a fully tightened state.

In this fully tightened state, the engagement of the locking flange 52 with the guide surface 53, the first female screw portion 17, and the like restricts the retraction of the cylindrical portion 31 of the press ring 14 with respect to the main body 13. Further, in the joint main body 12, a pair of lock rings 22 are connected to the distal end surface of the cylindrical portion 31 of the press ring 14 and the main body 13.
Between the receiving surface 27 and the positioning surface. Then, after the joint body 12 is in the final tightened state,
The pipe 11 is inserted into the joint body 12.

At this time, if the joint body 12 is in the fully tightened state, the inner end face 32a of the grip portion 32 of the push ring 14 and the body 1
3 is substantially in contact with the distal end surface, and the operator visually confirms that the joint main body 12 is quickly confirmed to be in the final tightening state. In addition, the grip portion 32 of the pressing wheel 14
A gap 54 between the inner end surface 32a of the
Is formed, and if the flat portion 51 is visible, it is confirmed that the joint main body 12 is in the temporarily tightened state, and the above operation is repeated, and the joint main body 12 in the temporarily tightened state is brought into the final tightened state.

[0029] Now, to insert a pipe 11 to the joint body 12, the insertion tube 37 of the first-core 36 pipe 1
1 at the end. Then, the outer end face 40 of the flange portion 38 of the in-core 36 on the extension of the deepest portion 21 of the display grooves 20
And the outer peripheral surface of the pipe 11 is
Are arranged along the outer peripheral surface of the. Thereafter, a line 41 is scribed on the outer peripheral surface of the pipe 11 at a position corresponding to an extension of the end surface of the press ring 14 using an oil-based pen or the like,
As shown in FIG. 5, the end of the pipe 11 on which the in-core 36 is inserted is inserted into the joint body 12 from the insertion hole 33. Then, as shown in FIG. 5, when the outer end surface 40 of the flange portion 38 of the in-core 36 reaches the abutment surface 18, becomes the same position as the end face of the ring 14 press line 41 of the outer peripheral surface of the pipe 11, incore 36 The outer end surface 40 of the flange portion 38 is in contact with the contact surface 18.

As shown in FIG.
When 1 is inserted, the space between the outer peripheral surface of the pipe 11 and the inner peripheral surface of the main body 13 is sealed by the pair of seal rings 30. When the end of the pipe 11 is inserted into the inside of the pair of lock rings 22, the restriction pieces 24 located at the two stages each slightly spread outward, and the tip ends are engaged with the outer periphery of the pipe 11 at the two stages. Are combined. As a result, escape of the pipe 11 from the joint body 12 is restricted.

[0031] The effects exerted by the first embodiment will be described below. The second body threaded on the outer peripheral surface of the cylindrical portion 31 of the push ring 14 among the main body 13 and the push ring 14 constituting the joint body 12
A flat portion 51 is provided at the base end of the male screw portion 34, and a locking flange 52 projects from the flat portion 51.
The locking flange 52 is formed in a thin plate shape, and has such a strength that it is not bent by a weak external force of a hand or the like but is bent by a strong external force of a wrench. When the joint body 12 is in the temporarily tightened state, the engagement of the locking flange 52 and the guide surface 53 of the main body 13 restricts the screwing of the cylindrical portion 31 of the push ring 14 into the main body 13, Push wheel 1
A gap 54 is formed between the main body 13 and the holding portion 32 of No. 4. When the joint body 12 is in the fully tightened state, the locking flange 52 bends and is locked by the first female screw portion 17 of the main body 13. Therefore, the gap 54 between the main body 13 and the pressing ring 14
It is possible to easily and quickly determine whether the press ring 14 is in the temporarily tightened state or the fully tightened state with respect to the main body 13 by the presence or absence of the first female screw portion 17 of the bent locking flange 52. the engagement of the, regulate retraction screw push wheel 14 relative to the body 13 in this clamped state, it is possible to prevent the loosening.

The locking flange 52 is annularly protruded over the entire circumference of the flat portion 51. Therefore, the locking flange 52 is securely brought into contact with the guide surface 53, and
Of the push ring 14 into the guide surface 5 can be surely restricted, and any portion of the locking flange 52 can be guided by the guide surface 5.
3. It can be locked to the first female screw portion 17 and the like, and the screw ring 14 can be reliably prevented from retreating from the main body 13 and the loosening thereof can be reliably prevented.

An annular guide surface 53 is formed at the distal end of the first female screw portion 17 so as to increase in diameter toward the distal end of the main body 13 and incline outward. By providing the guide surface 53, the locking flange 52 can be reliably contacted in the temporarily tightened state, and the bending direction of the locking flange 52 is guided by the guide surface 53 in the fully tightened state. The locking flange 52 can be easily and surely bent.

A display groove 20 is engraved on the outer peripheral surface of the main body 13 so that the outer end surface 40 of the flange 38 of the in-core 36 inserted into the pipe 11 corresponds to the display groove 20 and is formed linearly with an oil pen or the like. By scribing the line 41, this line 4
1, the pipe 11 can be reliably inserted into the joint body 12 by a predetermined insertion depth. (Second Embodiment) Hereinafter, a second embodiment of the present invention will be described in detail with reference to the drawings. In the second embodiment, the points different from the first embodiment will be mainly described.

As shown in FIG. 6, the joint main body 12 of the second embodiment includes a main body 13, a split ring 61 serving as a ring-shaped restricting means having one part cut off, and a ring-shaped washer. 62, and the push ring 14 having a substantially cylindrical shape. The split ring 61 and the washer 62 are made of a metal material such as an alloy (brass, bronze, etc.) like the main body 13 and the pressing ring 14.

On the outer peripheral surface of the main body 13, a nut portion 16 is formed at an intermediate portion, and a second male screw portion 3 is formed at a tip portion.
4 are formed. At the tip end of the main body 13, a pipe 1
The insertion hole 63 for inserting one is bored,
On the inner peripheral surface of the opening of the insertion hole 63, a first tapered surface 64 whose diameter increases toward the tip of the main body 13 is formed.
At the center of the insertion hole 63, an inner cylindrical portion 65 having a substantially cylindrical shape is provided.
From the middle portion in the axial direction of the main body 13, and is extended toward the distal end of the body 13. A second tapered surface 66 whose diameter decreases toward the end is formed on the outer periphery of the distal end of the inner cylinder 65 so that the end of the pipe 11 can be easily fitted into the inner cylinder 65. Has become. In addition, a through hole 70 is formed at an intermediate portion of the peripheral wall of the main body 13 as confirmation means having a substantially circular planar shape.
The insertion depth of the fitting body 12 is visible.

[0037] Between the inner cylindrical portion 65 and the inner peripheral surface of the insertion hole 63, annular insertion space 67 for inserting the pipe 11 in the body 13 is formed. Further, an inclined wall 68 whose diameter is reduced toward the inner end is formed in the inner part of the insertion hole 63. Further, an annular reduced diameter portion 69 whose outer diameter is smaller than the opening side of the insertion hole 63 is formed on the inner end side of the inclined wall 68 of the insertion hole 63. In the reduced diameter portion 69,
A seal ring 30 is fitted. When the pressing ring 14 is fastened to the main body 13, the end face of the pipe 11 is pressed against the seal ring 30 so that the pipe 1
The space between the end face 1 and the inner end wall of the reduced diameter portion 69 is sealed.

On the outer peripheral surface on the distal end side of the inner cylinder portion 65, a housing groove 72 for housing a seal member is formed so as to be concave over the entire circumference so as to be orthogonal to the axis of the inner cylinder portion 65. The receiving groove 72, a plurality of seal ring 30 is fitted. The outer diameter of these seal rings 30 is
, That is, the thickness of the seal ring 30 is the same as the depth of the accommodation groove 72. When the end of the pipe 11 is inserted into the inner cylinder 65, the pipe 1
The one end face does not come into contact with the outer peripheral portion of each seal ring 30.

A first female screw 17 which can be screwed with the second male screw 34 is threaded on the inner peripheral surface of the base end of the push ring 14, and a hexagonal nut-shaped nut is formed on the outer peripheral surface. The locking portion 35 is formed over the entire circumference. This locking portion 35
The wrench is engaged when the push ring 14 and the main body 13 are screwed together and released. The receiving surface 2 with which the washer 62 abuts on the tip side of the first female screw portion 17 inside the press ring 14
7 is formed in an annular shape so as to be orthogonal to the axis of the push ring 14. On the inner peripheral surface of the distal end portion of the press ring 14, housing recess 73 is recessed over the entire circumference. This housing recess 7
3, a seal ring 30 is fitted to prevent the pipe 11 from coming out of the joint body 12.

The split ring 61 is formed at one location so that a not-shown split extends in the axial direction, and can be reduced in diameter when an external force is applied from the outside toward the radial inside. The outer peripheral surface of the split ring 61 is
The third tapered surface 74 corresponds to the third first tapered surface 64. In addition, a pipe 1 is provided on the inner peripheral surface of the split ring 61.
An uneven surface is formed over the entire surface to prevent 1 from falling into the joint body 12. The washer 62 is interposed between the split ring 61 and the receiving surface 27 of the press ring 14.

On the outer peripheral surface of the main body 13, the second male screw portion 3 which is a boundary between the nut portion 16 and the second male screw portion 34
A flat portion 51 is formed at the base end of the main body 4 by cutting over the entire circumference of the main body 13. On the flat portion 51, a locking flange 52 as a locking projection is provided in an annular shape so as to extend over the entire circumference of the flat portion 51. An annular guide surface 53 is formed at the distal end of the first female screw portion 17 so as to increase in diameter toward the base end of the press ring 14 and to incline outward. The press wheels 14 temporarily fastened state where screwed by a weak force to the body 13, by contact with the guide surface 53 of the locking flange 52, a gap 54 is formed between the nut portion 16 of the pressing ring 14 and the body 13 It has become. The flat portion 51 can be visually recognized from the gap 54.

Next, the operation of the joint body 12 according to the second embodiment will be described. Now, when connecting the pipe 11 to the joint body 12, first, the split ring 61 and the washer 62 are arranged at the tip of the body 13, and then the press ring 14 is screwed with a small force to connect the joint body 12 to FIG. the temporarily fastened state shown in. In this temporarily tightened state, a gap 54 is formed between the push ring 14 and the nut portion 16 of the main body 13, and the flat portion 51 is formed.
Is visible.

[0043] Then, while viewing the through-hole 70, the pipe 1 to the end surface of the pipe 11 reaches the nearest inclined wall 68
1 is inserted into the joint body 12 in the temporarily tightened state, the end of the pipe 11 is inserted into the inner cylinder 65, and is disposed in the insertion space 67 of the body 13. Then, tighten the wheels 14 press with a working conveniences to the body 13. Then, the receiving surface 27 of the press ring 14 approaches the tip of the main body 13, and accordingly, the split ring 61 is pushed into the main body 13 via the washer 62. In this state, the third tapered surface 74 of the split ring 61 is engaged with the first tapered surface 64 of the main body 13, the diameter of the split ring 61 is reduced, and the inner peripheral surface of the split ring 61 is pressed against the outer peripheral surface of the pipe 11. You. As a result, the pipe 11 is firmly prevented from falling into the joint body 12.

The pressing wheel 14 is attached to the main body 1 using a spanner.
When tightened to 3, the split ring 61 is reduced in diameter, and at the same time, the entirety of the locking flange 52 is bent while being guided by the guide surface 53 such that the outer peripheral edge approaches the nut portion 16 by external force. Thereafter, the locking flange 52 which is bent is in contact with the inner end face 16a of the nut portion 16, the inner peripheral surface of the press wheel 14 is locked for example on the first female threaded portion 17, the fitting body 12 and a tightened state Become. And, the engagement of the locking flange 52 and the first female thread portion 17 restricts the screw ring 14 from retreating with respect to the main body 13.

[0045] According to the second embodiment described above, the following effects are exhibited. In the joint main body 12 of the second embodiment, after the pipe 11 is inserted into the joint main body 12 in the temporarily tightened state, the joint main body 12 is brought into the final tightened state, so that the pipe 11 can be removed from the inside of the joint main body 12. Exit is regulated. Therefore, the presence or absence of the gap 54 between the body 13 and the push ring 14, or press wheels 14 are or tightened state or a temporary tightening state can be discriminated easily and rapidly with respect to the body 13 At the same time, it is also possible to easily and quickly determine whether or not the removal of the pipe 11 from the inside of the joint body 12 is restricted. Moreover, the first female threaded portion 17 of the bent locking flange 52
The locking of the push ring 14 against the main body 13 in the fully tightened state can prevent the slack of the push ring 14 and prevent the pipe 11 from coming out of the joint body 12 due to the slack of the push ring 14. It can be reliably prevented.

A first tapered surface 64 whose diameter increases toward the end is formed on the inner peripheral surface of the distal end portion of the main body 13, and the outer peripheral surface of the split ring 61 is formed by the first tapered surface 64 of the main body 13. Is formed as the third tapered surface 74. Therefore, the split ring 61 can be easily reduced in diameter, and the pipe 11 can be prevented from coming out simply by setting the pressing ring 14 to the main body 13 in the final tightening state with a strong force.

The present embodiment can be embodied with the following modifications. -In each embodiment, although the locking projection was the annular locking flange 52 having a thin plate shape, the present invention is not limited to this. For example, the locking projection is constituted by a plurality of conical or polygonal pyramid-shaped projections projecting from the flat portion 51, and
When the press ring 14 is screwed into the projection, the projections may be deformed. Alternatively, as a thread having a triangular cross section, the thread may be deformed when the main body 13 and the press ring 14 are screwed together. Alternatively, the locking flange 52 of each embodiment may be cut off in the middle thereof, formed of a plurality of fan-shaped locking pieces made of a thin plate, and configured to bend when the main body 13 and the pressing ring 14 are screwed together. You may.

In the main body 13 of the first embodiment,
Instead of the display groove 20, a through-hole may be provided as checking means as in the second embodiment. Alternatively, the display groove 20 may be
3 may be provided at one location or at multiple locations. Alternatively, it may be displayed ridge instead of the display groove 20.

In each embodiment, the guide surface 53 is omitted, and the first female screw portion 1 of the locking flange 52 is temporarily tightened.
The screw thread 14 is restricted from being screwed in by contact with the thread of No. 7,
When in the final tightening state, the locking flange 52 may be guided in the bending direction by the side surface of the thread.

Further, the technical ideas that can be grasped from the above embodiment will be described below. (1) The locking projection is formed in a thin plate shape, and stands upright from a flat portion in a temporarily tightened state, and is brought into contact with the tip of a female screw portion formed on the main body or the pressing ring by contacting the side surface thereof with the pressing ring against the main body. The screwing is restricted, and in the fully tightened state, the tip of the flat ring is locked to the pressing ring or the inner end surface of the main body, thereby restricting screwing of the pressing ring with respect to the main body. The joint according to claim 1 or 2. In such a configuration, screwing of the push ring into the main body can be more reliably regulated in the temporarily tightened state, and screwing of the push ring into the main body can be more reliably regulated in the final tightened state.

(2) A tapered guide surface is formed at the distal end of the female screw portion formed on the main body or the press ring so as to increase in diameter from the base end toward the distal end. projections joint according to (1), characterized in that it is folded in the oblique direction while contacting the guide surface. In the case of such a configuration, the locking projection can be reliably bent in the final tightening state.

[0052] (3) the retaining member includes a metal base ring to an annular, while being projected in the same length from the base ring inwardly, the pipe insertion direction toward the inside of the base ring A lock ring composed of a plurality of restricting pieces having a slanted slope shape, wherein the restricting pieces are engaged with the outer peripheral surface of the pipe to prevent the pipe from coming off from the main body. The joint according to claim 1 or 2. In such a configuration, it is possible to prevent the pipe from falling out of the joint body only by inserting the pipe into the joint body.

(4) The locking projection according to claim 1 or 2, wherein the locking projection has a height slightly higher than the thread of the male screw portion and a predetermined height that does not contact the end surface of the main body or the pressing ring. fittings. In such a configuration, it is possible to surely deform the locking projection.

(5) The locking projection is provided at a predetermined position such that only the distal end thereof comes into contact with the inner end surface of the push ring or the main body in a state deformed on the flat portion. 1 or coupling as claimed in claim 2. With this configuration, it is possible to prevent the entire locking projection from being deformed so as to fall on the flat portion.

[0055]

As described above in detail, according to the present invention, the following effects can be obtained. According to the first aspect of the present invention, it is possible to easily and quickly determine whether the pressing ring is in the temporarily tightened state or the fully tightened state with respect to the main body, and to push the main body in the fully tightened state. Ring slack can be suppressed.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), screwing of the push ring into the main body can be reliably restricted, and slack of the push ring with respect to the main body can be reliably prevented.

[Brief description of the drawings]

Figure 1 is a partial cutaway view showing a joint body of the temporarily tightened state of the first embodiment.

FIG. 2 is a partially cutaway view showing the joint body in the fully tightened state according to the first embodiment.

3A is a side view showing a push ring, and FIG. 3B is an exploded perspective view showing a joint main body.

Figure 4 is a plan view showing a state of inserting the pipe into the fitting body.

Figure 5 is a partial cutaway view showing a state in which the pipe is inserted into the joint body.

FIG. 6 is a plan view showing a joint according to a second embodiment.

[Explanation of symbols]

11 pipe, 13 body, 14 press ring, 22 lock ring as restricting means, 34 second male screw portion as male screw portion, 34a screw thread, 51 flat portion, 52 as locking projection Locking flange, 54: gap, 61: split ring as regulating means.

Claims (2)

[The claims] 1. A main body having a cylindrical shape into which a pipe can be inserted, and a main body disposed in the main body and engaged with an outer peripheral surface of a pipe to be inserted to restrict the pipe from coming out of the main body. A restricting means, and a push ring screwed into the main body to position and fix the restricting means in the main body, and a flat part is provided at a base end of a male thread portion formed on the outer peripheral surface of the push ring or the main body. Or, provided on the entire circumference of the main body, a locking projection is protruded on the flat part so that the height is higher than the thread of the male screw part. In the temporary tightening state in which the pressing ring is tightened, the locking projection restricts the screwing of the pressing ring into the main body, a gap is formed between the pressing ring and the main body, and the main body is deformed by such a force that the locking projection is deformed. press in this clamped state in which tightened the wheels locking projection presses against the body against A coupling, wherein the joint is configured to regulate the screw from retreating so that the push ring and the main body are substantially in contact with each other. Wherein said locking projection is joint according to claim 1, characterized in that the annular provided on the entire periphery of the flat portion.