JP3077735B2 - Fluid pipe detachment prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing a pipe from being detached by using it at a joint between fluid pipes, and more particularly to a fluid pipe having an improved push bolt and a locking piece pressed by the push bolt. The present invention relates to a separation prevention device.

[0002]

2. Description of the Related Art As an apparatus of this kind, for example, the present applicant has already disclosed Japanese Utility Model Publication No. 1-39077 and Japanese Utility Model Publication 3-9
There is a device for preventing the detachment of a fluid pipe proposed in Japanese Patent Publication No. 598.

[0003] These conventional devices are provided with a locking piece for tightening a push bolt so that the cutting edge bites into the outer peripheral surface of the fluid tube insertion portion to prevent the tube from being detached.
This locking piece is used by being housed in a concave portion formed on the inner surface of the push ring fitted to the joint portion of the fluid pipe, so that in a device manufacturing factory or the like, parts management and mounting can be easily performed. For this purpose, the locking piece is often mounted in the recess in advance.

[0004] At this time, it is necessary to prevent the locking piece from falling out of the concave portion when transporting or mounting the device. The support piece is provided, and the locking piece is pressed against one of the inner walls of the concave portion to prevent the locking piece from falling off.

[0005]

In the above-mentioned conventional apparatus, the means for preventing the locking piece from falling off is a rubber-based elastic support piece, so that the elastic holding force of the locking piece is lost due to deterioration with time or the like. It may be damaged by bending or shear load or the like, and in this case, the locking piece may fall off from the concave portion.

Therefore, conventionally, when the detachment prevention device is left unused for a long period of time, or when the detachment prevention device is reattached due to the replacement of the fluid pipe or the like, a new elastic support piece is used. Had to be replaced, and the work was cumbersome and uneconomical.

Further, in the conventional apparatus, the locking piece and the push bolt are completely separated from each other, and only when the push bolt is tightened, the locking piece engages with the locking piece. If the push bolt is loosened due to vibrations during operation, or if a worker unfamiliar with handling the device loosens the push bolt carelessly,
There was a risk that it would come off the screw hole and be lost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a fluid pipe capable of completely preventing a locking piece from dropping out of a recess and a push bolt from coming off a screw hole. It is an object of the present invention to provide a detachment prevention device.

In order to achieve the above object, the present invention is to insert an insertion port 2a of the other fluid pipe 2 in a liquid-tight manner into a reception port 1a at one end of the fluid pipe 1, A locking piece that is tiltably received in a plurality of circumferentially facing recesses 14 formed in the inner surface of the anti-separation fitting or the inner surface of the receiving portion that is attached to the mouth portion 2a and engages with the receiving portion 1a. 13 is pressed and constrained by a push bolt 17 screwed into a screw hole communicating with the recess, so that the arc-shaped blade portion 13a formed near the inner surface front of the locking piece 13 is inserted. Mouth 2
was bite into the outer peripheral surface of a, the separation preventing device for a fluid pipe so as to prevent separation between the fluid tube, the locking piece
13 has a concave groove 16 formed on the outer surface thereof.
3c has a chevron-shaped cross-sectional shape.
The outer openings 16a face each other on the outer surface of the locking piece 13.
The protruding pieces 13d, 13d arranged in the shape of
The push bolt 1 is inserted into the concave groove 16.
7 so that the locking step 17a formed at the tip of the tip 7 can be loosely fitted.
In addition, a small space is provided between the upper surface of the locking step 17a and the projection 13d.
A gap that allows the locking piece 13 to tilt
It is characterized by being formed (claim 1).

[0010]

[0011] In this case, between the inner wall surface of the inner toward the recess 14 of the rear surface of the locking piece 13, to dispose the elastic member 19 presses the locking piece forward desired (claim 2) .

[0012] to fit into the fitting hole 18 of the end portion of the engaging side is formed on the engaging piece 13 of the elastic member 19 is desirable (claim 3).

The locking piece 13 and the push bolt 17
4 is always in the engaged state.
Even if you loosen the bolt 17, it may come off and be lost
Absent. In addition, the locking piece 13 is rotated by the push bolt 17.
Because it moves in and out in conjunction with the work, for example, when not in use
Loosen the push bolt 17 and set the locking piece 13
If it is retracted to the innermost part, damage to the blade part 13a is prevented.
When removing the press ring 6 from the pipe
If the push bolt 17 is loosened, the locking piece 13
Can be easily removed from the tube. And complete
In this device, the fluid pipes 1 and 2 are separated by fluid pressure or the like.
And the insertion part 2a separates from the reception part 1a.
When the locking piece 13 is moved, the top 13c and the push bolt 1
7 is tilted backward about the contact point with the bottom surface of the
a further penetrates into the outer peripheral surface of the insertion portion 2a. So
As a result, the detachment of the insertion portion 2a is completely prevented.
You.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show an example in which the present invention is applied to a two-part separation prevention device S.

In FIGS. 1 and 2, reference numerals 1 and 2 denote fluid pipes connected to each other, and reference numerals 1a and 2a denote their receiving portions and insertion portions. An outwardly facing flange 3 is continuously provided at the open end of the receiving portion 1a. The flange 3 has a plurality of (four in the embodiment) bolt insertion holes 3 at equal intervals in the circumferential direction.
a is drilled.

An annular recess 4 is provided on the inner surface of the opening of the receiving portion 1a.
Is formed, and a packing 5 for sealing the joint portion is inserted into the concave portion 4.

Reference numerals 6 and 6 denote annular detachment prevention fittings fitted on the outer peripheral surface of the insertion opening 2a, that is, a pair of two-part press rings. These pair of press rings 6 are shown in FIG. As described above, the pair of outward flanges 6a connected to the opposing portions are integrally fastened to each other by the bolts 7 and the nuts 8 screwed into the bolts.

Each pressing wheel 6 is composed of a main body 6a and a bulging portion 6b continuously provided in the middle of the main body 6a in the circumferential direction.
A bolt insertion hole 9 corresponding to the bolt communication hole 3a formed in the flange 3 is formed. Reference numeral 10 denotes a protrusion for pressing the packing 5 protruding from the front surface of the main body 6a (hereinafter, the direction will be described with the joint between the fluid pipes being the front).

Each pressing wheel 6 and the flange 3 of the receiving portion 1a are
The nuts 12 are connected to each other by screwing the nuts 12 into the bolts 11 inserted into the bolt insertion holes 3a and 9 respectively.

On the inner surface of the bulging portion 6b of the pressing wheel 6, a concave portion 14 for accommodating a locking piece 13 to be described in detail later, and a threaded hole 15 extending in the radial direction of the tube communicating with the concave portion 14 are formed. I have.

As shown in FIG. 3 to FIG.
An arc-shaped blade portion 13a having a size that can be tilted in the front-rear direction in the concave portion 14 and having a curvature substantially equal to that of the outer mold of the fluid pipe 2 is formed inwardly and forward of the inner surface thereof. An inner surface 13b behind the blade portion 13a is an inclined surface slightly inclined outward.

A concave groove 16 is formed on the outer surface of the locking piece 13, and the groove bottom has a mountain-shaped cross-sectional shape having a top 13c near the rear. Outer opening 16a of concave groove 16
Is a protruding piece 1 continuously provided on the outer surface of the locking piece 13 so as to face each other.
Due to 3d and 13d, the width of the groove is smaller than the internal groove width, and both ends of the concave groove 16 in the tube axis direction are open.

The front and rear surfaces 13e and 13f of the locking piece 13 are flat surfaces, and the distance between the front and rear surfaces is slightly reduced toward the outside.

Into the screw hole 15 formed in the bulging portion 6b, a push bolt 17 having a circular locking step portion 17a at its tip, which is loosely fitted and engaged with the concave groove 16, is screwed. The bottom of the stop 17a is in line contact with the top 13c of the groove bottom.

An appropriate gap is provided between the concave groove 16 and the locking step 17a in the radial direction of the tube, and the locking piece 13 can tilt in the longitudinal direction about the top 13c as a fulcrum in the concave groove 16. It is like that. That is, the upper surface of the locking step 17a and the projection 1
3d, a gap is formed to allow at least the inclined movement of the locking piece 13.

At the center of the rear surface 13f of the locking piece 13 is located slightly inward, and a bottomed fitting hole 18 is formed, into which a front end of an elastic member 19 such as rubber is fitted. The rear end of the elastic member 19 is in pressure contact with the inner wall surface of the enlarged diameter portion 20 that is continuous with the concave portion 14, whereby the locking piece 13 is pressed forward, and its front surface 13 e contacts the front wall surface of the concave portion 14. As a result, it is held in a predetermined posture, and the sneaking movement in the concave portion 14 is restricted.

When the locking step 17a of the push bolt 17 is engaged with the concave groove 16 of the locking piece 13, prior to mounting the pressing ring 6 on the fluid pipe 2, the following steps are performed in a factory or the like. Done. First, the push bolt 17 is screwed in until its tip protrudes from the opening end of the concave portion 14. Then, the concave groove 16 of the locking piece 13 in which the elastic member 19 is previously fitted is inserted into the locking step 17a. Insert from either open end.

Next, when the push bolt 17 is loosened, the locking piece 13 is pulled into the recess 14 together with the elastic member 19 and is held in a predetermined posture.

Next, the operation of the above embodiment will be described.

After a pair of push rings 6 fitted to the insertion portion 2a are connected to the receiving portion 1a to complete the joining of the fluid pipes 1 and 2, the push bolts 17 of each push ring 6 are gradually tightened. The cutting edge of the blade portion 13a of the locking piece 13 is brought into contact with the outer peripheral surface of the insertion portion 2a as shown in FIG.

When the push bolt 17 is further tightened, the locking piece 13 tilts rearward with the blade portion 13a as a fulcrum, as shown in FIG. Touched and restrained.

When the push bolt 17 is further tightened with a predetermined torque in this state, the blade portion 13a slightly bites into the outer peripheral surface of the insertion portion 2a, and the mounting is completed.

When the fluid pipes 1 and 2 are displaced in a direction in which the fluid pipes 1 and 2 are separated from each other due to fluid pressure or the like, and the insertion port 2a attempts to separate from the reception port 1a, as shown by the imaginary line in FIG. The blade 13a is tilted backward about the contact point between the top portion 13c and the bottom surface of the push bolt 17, and the blade portion 13a further bites into the outer peripheral surface of the insertion portion 2a. As a result, detachment of the insertion portion 2a is completely prevented.

At this time, the locking piece 13 is prevented from further tilting by the rear surface 13f being in contact with the rear wall surface of the concave portion 14, so that excessive cutting of the blade portion 13a is prevented. .

As described above, in the apparatus of the above embodiment, similar to the conventional apparatus already proposed by the applicant of the present invention, only the excellent effect of preventing the fluid pipes 1 and 2 from separating can be exhibited. In addition, the problem of the conventional device can be solved.

That is, in the present invention, the locking piece 13 is prevented from dropping out of the recess 14 by mechanically engaging the locking step 17a of the push bolt 17 with the concave groove 16 formed in the locking piece 13. Therefore, the falling off of the locking piece 13 is completely prevented as compared with the conventional one using the rubber-based elastic supporting piece.

The locking piece 13 and the push bolt 17 are
Since the push bolt 17 is always engaged in the concave portion 14, even if the push bolt 17 is inadvertently loosened, it does not come off and be lost. In addition, since the locking piece 13 moves in and out in conjunction with the turning operation of the push bolt 17, for example, when not in use, the push bolt 17 is loosened and the locking piece 13 is moved to the innermost portion of the concave portion 14. If it is retracted, the blade portion 13a can be prevented from being damaged, and if the push ring 17 is loosened when the press ring 6 is removed from the tube, the locking piece 13 that has deeply penetrated the insertion portion 2a can be removed from the tube. It can be more easily removed.

The present invention is not limited to the above embodiment, but can take various forms.

For example, the locking piece 13 and the push bolt 17 may be in a dovetail groove and dovetail engagement mode.

A compression coil spring or a leaf spring bent in a V-shape may be used as the elastic member 19, and the elastic member 19 may be implemented without using such an elastic member 19.

In the embodiment, the locking piece 13 and the push bolt 17 are provided on the pressing wheel 6 side. However, a concave portion is formed on the inner surface of the receiving portion 1a to accommodate the locking piece, and the structure of the flange 3 is slightly changed. Alternatively, a push bolt may be screwed into this.

The present invention can be applied not only to the above-described two-parting type separation prevention device S but also to a device having a ring of a pressing ring, and the number of locking pieces 13 is limited to two. However, the present invention can also be applied to an appropriate number of press wheels provided in accordance with the pipe diameter in the circumferential direction.

[0044]

According to the present invention, the following effects can be obtained.

(A) According to the first aspect of the invention, locking
The piece 13 and the push bolt 17 are always in the recess 14.
In the engaged state, carelessly loosen the push bolt 17
Nor does it come off and get lost. Moreover,
The stop piece 13 moves inward and outward in conjunction with the turning operation of the push bolt 17.
So that, for example, push bolts when not in use
17 and pull the locking piece 13 into the deepest part of the concave part 14
By doing so, damage to the blade portion 13a can be prevented, and
When removing the press ring 6 from the pipe,
If loosened, the biting locking piece 13 can be easily released from the tube.
Can be escaped. And this device when mounting is completed,
Fluid pipes 1 and 2 are displaced in the direction of separation by fluid pressure
When the insertion portion 2a tries to separate from the reception portion 1a,
The piece 13 is a contact point between the top 13c and the bottom of the push bolt 17.
Is tilted rearward about
It will further penetrate the outer peripheral surface. As a result, the insertion part 2
The separation of a is completely prevented.

[0046]

( B ) According to the second aspect of the present invention, since the locking piece is held in a predetermined position without rattling in the concave portion, it is convenient when setting the locking piece in the fluid pipe. is there.

( C ) According to the third aspect of the invention, it is possible to prevent the elastic member from being displaced with respect to the locking piece or falling off.

[0049]

[Brief description of the drawings]

FIG. 1 is a longitudinal rear view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a longitudinal sectional view taken along line BB in FIG.

FIG. 4 is a rear view of the locking piece.

FIG. 5 is a longitudinal sectional view taken along the line CC in FIG. 4;

FIG. 6 is an enlarged cross-sectional view of a main part of the present invention, and is an explanatory view showing a state before a locking piece is set.

FIG. 7 is an explanatory view showing a state when the setting of the locking pieces is completed.

[Explanation of symbols]

1, 2 Fluid pipe 1a Reception port 2a Insertion section 3 Flange 4 Annular recess 5 Packing 6 Press ring (removal prevention fitting) 6a Outward flange 6b Swelling section 7 Bolt 8 Nut 9 Bolt insertion hole 10 Projection section 11 Bolt 12 Nut 13 Locking piece 13a Blade 13b Inner surface 13c Top 13d Protrusion 13e Front 13f Rear 14 Concave 15 Screw hole 16 Concave groove 17 Push bolt 18 Fitting hole 19 Elastic member 20 Large diameter portion S Detachment prevention device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 58-72586 (JP, U) JP-B 61-515 (JP, B2) JP-B-59-15827 (JP, Y2) JP-B-59- 40630 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 21/08

Claims (3)

(57) [Claims] 1. An insertion port 2a of the other fluid pipe 2 is inserted in a liquid-tight manner into a reception port 1a at an end of one of the fluid pipes 1 and attached to the insertion port 2a. Locking piece 1 tiltably accommodated in a plurality of circumferentially oriented recesses 14 formed on the inner surface of the anti-separation metal fitting or the inner surface of the socket that engages with the portion 1a.
3 is pressed and constrained by a push bolt 17 screwed into a screw hole communicating with the recess, thereby forming an arc-shaped blade formed near the inner surface front of the locking piece 13.
In a fluid pipe detachment prevention device in which 13a bites into the outer peripheral surface of the insertion portion 2a to prevent detachment of the fluid pipes, a concave groove 16 is formed on the outer surface of the locking piece 13. groove
The bottom has a mountain-shaped cross-section as the top 13c,
The outer opening 16 a of the concave groove 16 is formed on the outer surface of the locking piece 13.
The protruding pieces 13d, 13d provided in a mutually opposing shape
The locking step 17 a formed at the tip of the push bolt 17 is loosely fitted in the concave groove 16.
Between the upper surface of the locking step 17a and the protruding piece 13d.
Only allow at least the tilting movement of the locking piece 13
Wherein the gap is formed . 2. An inward portion of the rear surface of the locking piece 13 and a recess 14
The detachment prevention device for a fluid pipe according to claim 1, wherein an elastic member ( 19) for pressing the locking piece toward the front is provided between the fluid pipe and the inner wall surface of the fluid pipe. 3. An end of the elastic member 19 on the side of the locking piece is provided with a locking piece.
Separation preventing device for a fluid pipe according to claim 2, characterized in that fitted into the fitting hole 18 formed in the 13.