JP3010288B1 - Flexible pipe joint - Google Patents

Abstract

A retainer (3) that surrounds the outer periphery of the distal end of a bellows pipe (91) that protrudes into a connected cylinder (1) from within a tightening cylinder (2) that is screwed into the connected cylinder (1). The retainer (3) is forcibly pushed into the retainer accommodating chamber (17) in the connected cylinder (1) by the fastening cylinder (2), and the bellows pipe (91) is provided. In the flexible pipe joint that fits outside, the thin flange (38) formed on the outer circumference of the retainer (3) is engaged with the protrusion (11) formed on the inner circumference of the connected cylinder (1). Even when the retainer (3) is temporarily fixed at the initial position, the risk of damage to the flange (38) during manufacture and storage of the retainer (3) is reduced. SOLUTION: A flange is formed on an outer periphery of the retainer (3) so as to engage with a projecting portion (11) of an inner periphery of a connected cylinder (1) from behind in a screwing direction of the tightening cylinder (2). (38), and the outer peripheral portion of the flange (38) is set to be thicker (35) than other portions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible pipe joint, and more particularly to a joint for connecting a flexible metal bellows pipe to a connected portion, for example, when connecting a gas pipe to a gas cock. Applicable to

[0002]

2. Description of the Related Art As a joint for connecting a flexible metal bellows tube to a connected portion, there is a joint having a structure shown in FIG. In this device, a fastening cylinder (2) screwed into one end of a connected cylinder (1) connected to a gas inlet of a gas cock or the like.
A proximal end (33) of a cylindrical retainer (3) is rotatably fitted to the distal end of the cylindrical retainer (3). In the retainer (3), slits (31) (31) cut in the axial direction from the distal end are formed at a constant pitch in the circumferential direction, whereby the retainer (3)
Can be deformed in a widened shape. Further, a tapered portion (17) into which the retainer (3) is pushed is formed on the inner periphery of the connected cylinder (1).

On the other hand, a tightening cylinder protruding from the connected cylinder (1)
An elastic C-ring (6) is interposed between the enlarged diameter portion (20) of (2) and the base end (16) of the connected cylinder (1). C
When the ring (6) is provided, the distance between the distal end face of the retainer (3) and the pipe receiving surface (51) of the connected cylinder (1) is determined in the state of FIG. This is set to one peak of the pipe (91), so that a valley (93) following the first peak (92) at the tip of the bellows pipe has an engaging projection on the inner periphery of the tip of the retainer (3). This is for ensuring that (37) is engaged.

In this apparatus, when a bellows tube (91) is forcibly inserted from the rear end of the tightening cylinder (2), a first ridge (92) at the front end thereof is provided.
Moves in the insertion direction while pushing and spreading the tip of the retainer (3), whereby the bellows tube (91) protrudes by one mountain from the tip of the retainer (3) (see the imaginary line in FIG. 8). ).
In this state, when the C ring (6) is removed and the tightening tube (2) is tightened, the retainer (3) is pushed into the tapered portion (17) in the connected tube (1) and its diameter shrinks. This allows
The engaging projection (37) bites deep into the valley (93) of the bellows tube (91).
When the tightening cylinder (2) is further tightened, the first peak of the bellows pipe (91) is
(92) is the tip of the retainer (3) and the connected cylinder facing it
The pressure is flattened by the tube receiving surface (51) of (1), and the tip of the bellows tube (91) and the O-ring (52) are in contact with each other to ensure the sealing performance. Thereby, the bellows pipe (91) is connected to the connected cylinder (1).

In this case, in the initial state before the bellows tube (91) is connected, the enlarged diameter portion (20) near the rear end of the tightening tube (2) and the base of the connected tube (1) opposed thereto are connected. C-ring between ends (16)
(6) is interposed, so that only one peak of the bellows pipe (91) protrudes from the retainer (3) so that the pipe receiving surface (51) of the retainer (3) and the connected cylinder (1) can be used. ) Interval can be set.

However, the C-ring (6) allows the retainer (3) to be connected to the tube (1) so that only one peak of the bellows tube (91) protrudes from the retainer (3).
Since the interval of (51) is set, the C ring
There is a problem that as many parts as necessary are required for (6). In order to solve the above problem, FIG.
The structure shown in FIG. That is, a protrusion (11) is provided on the inner periphery of the connected cylinder (1), and the protrusion (1) is provided.
An easily breakable flange (38), which engages with 1) from the rear in the screwing direction of the tightening cylinder (2), is provided around the outer periphery of the retainer (3). When the retainer (3) moves toward the tapered portion (17) while the flange (38) is kept engaged with the projecting portion (11), the flange (38) moves along the inner periphery thereof. Break and separate from the retainer (3) or the flange (38)
Is deformed toward the tightening cylinder (2) side (the state of the imaginary line in FIG. 9).

In this device, the flange (38) on the outer periphery of the retainer (3) engages with the projection (11) on the inner periphery of the connected cylinder (1), so that the retainer (3) is returned to the initial position. Positioned. Therefore, in this device, the C ring for positioning described above is used.
Independent components as in (6) become unnecessary, and the number of components can be reduced.

[0008]

However, according to the improvement shown in FIG. 9, the flange (38) separates from the retainer (3) or is deformed with the tightening of the tightening cylinder (2). It is necessary to reduce the strength by setting the flange (38) to be thin so that it can be performed. Therefore, there is a problem that the thin-walled flange (38) having low strength is easily hit by an obstacle when the retainer (3) is manufactured and stored, and the thin-walled flange (38) is easily damaged.

SUMMARY OF THE INVENTION The present invention has been made in view of the above point, and "protrudes into the connected cylinder (1) from within the tightening cylinder (2) screwed into one end of the connected cylinder (1). A retainer (3) surrounding the outer periphery of the distal end of the bellows pipe (91), wherein the retainer (3) is screwed into the tightening cylinder (2),
A flexible pipe joint which is forcibly pushed into the retainer storage chamber from an initial position in the connected cylinder (1), contracts in diameter, and fits outside the valley portion of the bellows pipe (91) in a state of preventing expansion. , A retainer for the projection (11) formed on the inner circumference of the connected cylinder (1).
Even if the retainer (3) is temporarily fixed at the initial position by engaging a thin flange (38) formed on the outer periphery of (3), the manufacture and storage of the retainer (3) are performed. It is an object to reduce the fear that the flange (38) is sometimes damaged. * 1

[0010]

The technical means of the present invention for solving the above-mentioned problems includes a projecting portion (11) provided on the inner periphery of the connected cylinder (1) and the projecting portion (11). ) For the tightening cylinder
(2) The retainer is engaged so as to engage from the rear in the screwing direction.
A flange (38) provided on the outer periphery of (3) and broken so that the engagement is forcibly released by a pushing force acting on the retainer (3) from the tightening cylinder (2); The outer peripheral portion of the flange (38) is set to be thicker than other portions. "

According to the above technical means, the flange (3) of the retainer (3) in the initial state is similar to that of the above-mentioned improvement plan.
8) is engaged with a protruding portion (11) provided on the inner periphery of the connected cylinder from the rear in the screwing direction of the tightening cylinder (2). In this state, when the bellows tube (91) is inserted into the joint and the tightening tube (2) is tightened, the pushing portion (11) acts on the retainer (3) from the tightening tube (2) to press the projecting portion (11). The flange (38) on the outer periphery of the retainer (3) is broken so that the engagement of the retainer (3) is forcibly released.
Here, "breakage" is a concept including both deformation of the flange (38) and breakage of the flange (38) and separation from the retainer (3).

As a result, the retainer (3) is connected to the connected cylinder (1).
And the retainer (3) holds the bellows tube (91) in a retaining state. On the other hand, in the above technical means, since the outer peripheral portion of the flange (38) is set to be thicker than the other portions, the thick portion improves the strength of the entire flange (38). Exhibits a reinforcing function.

[0013]

Since the present invention has the above-described structure, the present invention has the following specific effects. The reinforcing function of the thick part on the outer periphery of the flange (38) increases the strength of the entire flange (38), so that even if an obstacle hits the flange (38) during manufacture or storage of the retainer (3), it is not easily damaged. .

[0014] From the rear in the screwing direction of the tightening cylinder (2),
At the time of assembling a joint in which the retainer (3) is inserted into (1), there is an advantage that the retainer (3) can be smoothly inserted into the connected cylinder (1). That is, the outer flange (3) of the retainer (3)
8) In the case of the improvement shown in FIG. 9 in which the whole body is thin, when the joint for inserting the retainer (3) into the connected cylinder (1) is assembled, the outer periphery of the flange (38) is connected to one end of the connected cylinder (1). Female screw (tightening cylinder
(2) It is easy to get caught in the valley of the screw). On the other hand, according to the above technical means, since the outer periphery of the flange (38) is set to be thick, the outer peripheral portion is less likely to be caught by the valley portion of the female screw, and as a result, the retainer (3)
Can be smoothly inserted into the connected cylinder (1). [Others] * 2 In the above item 1, the flange (38) is continuous over the entire circumference in the outer circumferential direction of the retainer (3), and the outer circumferential portion of the flange (38) is the entire area in the circumferential direction. Is thicker than the other portions of the retainer (3), the flange (38) is a continuous annular body surrounding the outer periphery of the retainer (3), and the flange (38) is annularly continuous. Since the entire outer periphery of (38) is thick, the strength of the flange (38) is further improved as compared with the case where the flange (38) is divided into a plurality of parts in the circumferential direction of the retainer (3). * Item 3 In the above item 1 or 2, the "Flange (38)
The means for setting the outer peripheral portion of the flange to be thicker is a ridge that bends from the outer peripheral portion of the flange (38) backward in the screwing direction of the tightening cylinder (2). ” ), The flat surface opposite to the surface on which the raised ridge is provided is engaged with the protruding portion (11) on the inner periphery of the connected cylinder (1). Therefore, compared with the case where the surface of the flange (38) on which the raised ridges are provided (the surface is uneven due to the formation of the raised ridges) is engaged with the protrusion (11), the flange (38) is When the bellows tube (91) is connected, it stably engages with the protrusion (11). * 4. As described above, the flexible pipe joint of the above-mentioned paragraph 1 includes a type in which the flange (38) is deformed in accordance with the tightening of the tightening cylinder (2). In order to ensure the deformation of the flange (38), the following specific configuration can be adopted.

That is, in the state where the retainer (3) is pushed by the tightening cylinder (2) screwed into the connected cylinder (1),
A flange relief space recessed toward the joint center axis from the tip of the protrusion (11) is formed in a portion that is continuous with the flange (38) in the screwing direction of the tightening cylinder (2). Configuration "can be adopted. With this structure, when the tightening cylinder (2) is tightened, a flange relief space (connected cylinder (2)) is formed in a portion that is continuous with the flange (38) in the screwing direction of the tightening cylinder (2). 1) The flange (38) is deformed so as to escape into the joint center side from the tip of the protruding portion on the inner periphery), so that the flange (38) is less likely to break and separate from the retainer (3). Become. Therefore, it is possible to avoid such a problem that the flange (38) separated from the retainer (3) bites into a moving part such as the tightening cylinder (2) or the bellows pipe (91).

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described together with the illustrated example. As shown in FIG. 1, the flexible pipe joint according to the present embodiment includes a connected cylinder (1) connected to a gas cock, and a retainer (3) inserted into the connected cylinder (1).
And a tightening cylinder (2) for pushing the retainer (3) into the back of the connected cylinder (1), and these connected cylinders (1),
The fastening cylinder (2) and the retainer (3) are made of a metal material such as brass.

The details of each section will be described below. [Regarding Connected Tube (1)] As shown in FIGS. 1 and 2, a gas inlet (not shown) of a gas cock (not shown) is provided on the outer periphery of the downstream end (the upper end in FIG. 1) of the connected tube (1). A male screw (10) is screwed into the hole.

The connected cylinder (1) has a female screw (13) engraved on the inner periphery of the screwing side end of a tightening cylinder (2), which will be described later, on the upstream side. A projection (11) is formed on the inner periphery on the downstream side of (13) (in front of the tightening cylinder (2) in the screwing direction), and the projection (11) is formed on the inner surface of the connected cylinder (1). It is continuous over the entire circumferential direction. On the inner circumference of the connected cylinder (1), an annular ridge (119) adjacent to the upstream side of the protrusion (11) (rearward in the screwing direction of the tightening cylinder (2)) is provided in the entire circumferential direction. The inner diameter of the annular ridge (119) portion is formed so as to be connected to the projection (11).
It is set slightly larger than the inner diameter of the part.

A retainer escape portion (15) having an enlarged inner diameter of the connected cylinder (1) is formed downstream of the formation portion of the protruding portion (11). The retainer escape portion (15) is formed to secure a space that allows the outer periphery of the tip of the retainer (3) to spread when the bellows tube (91) is forcibly inserted into the retainer (3) described later. is there. A tapered portion (17) is formed on the inner periphery of the downstream end side of the retainer escape portion (15), which is a retainer storage chamber whose diameter decreases gradually toward the front in the screwing direction of the tightening cylinder (2). A small-diameter gas passage (18) is continuous downstream of the tapered portion (17). A tubular portion (19) extends at the upstream end of the gas passage (18), and the tubular portion (19)
An annular groove (5) for mounting an O-ring (52) is provided on an annular pipe receiving surface (51) connected from the base end of the tapered portion (17) to the small-diameter end of the tapered portion (17).
3) is formed. [Regarding Tightening Tube (2)] The tightening tube (2) screwed into one end of the connected tube (1) has a wrench engaging portion (22) having a hexagonal outer periphery and a It has a cylindrical portion (23) that follows.
Also, a male screw (29) is provided on the outer periphery of the cylindrical portion (23) in the middle of the axial direction.
And a small-diameter cylindrical portion (205) to be inserted into a retainer (3) described later protrudes from the distal end of the cylindrical portion (23). A retainer pressing surface (28) extending from the base end of the small-diameter tube portion (205) to the outside in the radial direction of the tightening tube (2) comes into contact with the end surface of the retainer (3).

The outer diameter of a portion (239) of the cylindrical portion (23) that continues from the retainer pressing surface (28) to the upstream side is an annular ridge (119) in the connected cylinder (1). It is smaller by a predetermined dimension than the inner diameter of the part. This allows the flange
A flange relief space (S) recessed toward the joint center axis from the end of the protruding portion (11) is provided in a portion that continues to the rear in the screwing direction of the tightening cylinder (2) with respect to (38). Is formed.

The inner periphery of the wrench engaging portion (22) is covered with a covering tube (95) made of an elastic synthetic resin for covering the outer periphery of the bellows tube (91).
A concave portion (24) for loading a waterproof packing (27) in contact with (see FIG. 3) is provided. [Retainer (3)] The retainer (3) pushed deep into the connected cylinder (1) by screwing the tightening cylinder (2) into
The main body (30) formed in a cylindrical shape as a whole and the tightening cylinder
The retainer (3) has a slit (31) (31) cut in the axial direction from the downstream end face, in addition to a thin flange (38) projecting from the outer periphery of the end on the (2) side. ) Are arranged in a circumferential direction at a pitch of 90 degrees. And slit (31)
The bottom wall portions (34) and (34) of (31) are formed to be thin, so that the inner diameter of the downstream end portion of the retainer (3) can be easily enlarged.
It is easy to bend so that it can contract. Also, retainer
As described above, the flange (38) is provided around the outer periphery of the end of the tightening cylinder (2) in (3), and the flange (3)
The outer diameter of 8) is the same as that of the connected cylinder (1).
Substantially coincides with the inner diameter of the portion. Therefore, retainer (3)
With the flange (3) attached to the connected cylinder (1).
The outer peripheral surface of (8) comes into substantially contact with the inner peripheral surface of the annular ridge (119), whereby the retainer (3) does not rattle in the connected cylinder (1) in the radial direction, and the outer peripheral surface of the annular protrusion (119) does not rattle. Connection tube (1)
And is positioned coaxially. A gap (103) is provided between the outer periphery of the retainer (3) near the base end of the flange (38) and the inner periphery of the protruding portion (11) in the connected cylinder (1). Is formed.

The outer peripheral portion of the flange (38) is provided with a tightening cylinder (2).
A bent piece (35) is formed as a ridge that bends toward the side, so that the outer periphery of the flange (38) is set to be thick. The bent piece (35) is continuous in the circumferential direction. The bent piece (35) is provided with a thin flange (38)
This is to increase the strength by making the outer periphery thicker, which prevents the flange (38) from being damaged even if it hits the flange (38) during the manufacture and storage of the retainer (3) before the joint is assembled. You.

A concave groove (36) in which an elastic ring (55) is fitted is formed on the outer periphery near the distal end of the retainer (3), and the inner peripheral surface of the downstream distal end of the retainer (3) is formed. Is provided with an engaging projection (37). In the natural state where the tip of the retainer (3) does not expand or contract, the engagement protrusion (3
The diameter of the circle connecting the inner peripheral end of 7) is set slightly smaller than the diameter of the peak of the bellows tube (91) and larger than the diameter of the valley of the bellows tube (91).

The elastic ring 55 may be a C-ring having elasticity or an elastic rubber ring. [Assembly work of flexible pipe joint] In order to assemble the flexible pipe joint according to the present embodiment using the above-mentioned parts, first, the connected pipe (1) starts from the upstream end of the connected pipe (1). Retainer inside
Insert (3). In this case, the retainer (3) is positioned such that the flange (38) formed at one end of the retainer (3) faces rearward.
Into the connected cylinder (1). Then, the flange (38) of the retainer (3) is moved from the upstream side (from the rear in the screwing direction of the tightening tube (2)) to the protruding portion (11) of the inner periphery of the connected tube (1).
Engage. In this state, the outer peripheral surface of the flange (38) is substantially in contact with the inner peripheral surface of the annular protruding portion (119) provided around the connected cylinder (1).
(3) is positioned coaxially with the connected tube (1) and the tightening tube (2). That is, the retainer (3) is prevented from rattling in the radial direction in the connected cylinder (1).

Next, a tightening cylinder is attached to the female screw (13) of the connection cylinder (1).
Screw in the male screw (29) of (2), thereby tightening the tightening cylinder.
The retainer pressing surface (28) at the front end of (2) is once loosely contacted with the base end surface (360) of the retainer (3) opposed thereto, and then is slightly unscrewed and retracted. Thereby, the tightening cylinder (2) is attached to the initial position. As a result, the engaging projection (37) at the tip of the retainer (3) and the pipe receiving surface (5
Distance L ₁ between 1) is set to a dimension of about a mountain portion of the bellows tube below (91). [Regarding connection work of bellows pipe (91)] Next, the work of connecting the bellows pipe (91) as a flexible pipe to a connection object such as a gas cock using the above-mentioned flexible pipe joint will be described.

As shown in FIG. 3, the male screw (10) at the downstream end of the connected cylinder (1) and the gas inlet of the gas cock (G) are screwed in advance. Next, as shown in the same figure, when a flexible bellows pipe (91) for gas supply is inserted from the rear end which is the upstream end of the tightening cylinder (2), the bellows pipe (91) at the top of the bellows pipe (91) is inserted. The first ridge (92) comes into contact with the engaging projection (37) of the retainer (3). From this state,
When the bellows tube (91) is forcibly pushed, the engagement projection (37) is strongly pushed outward in the radial direction by the first peak (92). Then, the tip of the retainer (3), which is easily deformed in the radial direction due to the formation of the slits (31), (31), is attached to the elastic ring.
The diameter is increased against the urging force of (55), whereby the engaging projection (37) of the retainer (3) climbs over the first peak (92) of the bellows tube (91) and continues to the valley. It matches the part (93). At this time, the distal end of the retainer (3) contracts in diameter due to the urging force of the elastic ring (55), whereby the engaging projection (37) is reduced to the valley portion of the bellows tube (91).
(93) loosely engaged. Then, the flange (38) of the retainer (3) engaging with the projecting portion (11) on the inner circumference of the connected cylinder (1) causes the engaging convex portion (37) of the retainer (3) to be connected to the connected convex portion (37). cylinder (1) bellows tube as the distance L ₁ is already described tube receiving surface (51)
Since it is set to one mountain of (91), the first of the bellows pipe (91)
Only the peak (92) protrudes downstream from the retainer (3) (see FIG. 4).

When the tightening cylinder (2) is tightened from the state shown in FIG. 4, when the retainer pressing surface (28) of the tightening cylinder (2) is used, the retainer (3)
Is pressed. When the tightening cylinder (2) is further tightened, the retainer (3) is tapered while the thin flange (38) provided at one end of the retainer (3) remains engaged with the protrusion (11). Move to (17) side. At this time, the flange (38) on the outer periphery of the retainer (3) is located between the outer periphery near the tip of the cylindrical portion (23) of the tightening tube (2) and the annular ridge (119) of the connected tube (1). Deforms so as to escape into the flange escape space (S). This forcibly releases the engagement between the retainer (3) and the projection (11) on the inner periphery of the connected cylinder (1). When the tightening cylinder (2) is further tightened, the retainer (3) pressed by the retainer pressing surface (28) of the tightening cylinder (2) is tapered (17) as a retainer storage chamber of the connected cylinder (1). The retainer (3) is pushed into the engagement protrusion (37) at the tip of the retainer (3), and is deeply engaged with the first peak (92) of the bellows tube (91) (see FIG. 5). That is, the retainer (3) is a bellows tube (91)
Outside of the valley portion (93) in an expansion preventing state. Also, tightening cylinder (2)
In the state of FIG. 5 in which the
(3) The engaging projection (37) at the tip and the tube receiving surface (51) of the connected cylinder (1)
The first peak portion (92) of the bellows pipe (91) is pinched and flattened and pressed against the O-ring (52), whereby the sealing property of the tip of the bellows pipe (91) is ensured and the piping work is performed. Is completed. [Others] In the above embodiment, the tapered portion (17) formed in the connected cylinder (1) is the retainer storage chamber. However, the cylindrical vacant chamber having an inner diameter uniform in the axial direction is defined as the retainer storage chamber. And the distal end of the retainer (3) is formed in a tapered shape tapering toward the distal end, and the retainer (3) contracts in diameter when the tapered portion is forcibly pushed into the cylindrical empty space. It may be. In the above embodiment, the flange (38) is provided around the end of the retainer (3). However, as shown in the imaginary line in FIG. 1 and FIG. 6, the end of the retainer (3) shifts in the axial direction. Four flanges (38) (38) arranged in the circumferential direction may be formed at the specified positions. In this device, the flanges (38) and (38) are separated from each other at slits (31) and (31) formed in the retainer (3), and the outer peripheral portions of the flanges (38) and (38) are separated. Is a tightening cylinder
(2) A bent piece (35) is formed by bending to the side. Thereby, the thickness of the outer periphery of the flange (38) is increased to improve the strength of the outer periphery of the flange (38). In this case, the cylindrical main body (30) of the retainer (3) is formed at the bottom of the slits (31) (31) formed therein (the end on the side of the tightening cylinder (2)).
At the thin connecting portion (33). Even in this case, when the retainer (3) is pushed by the tightening cylinder (2), the retainer (3) is formed at a portion that is continuous with the flange (38) behind the screwing direction of the tightening cylinder (2). Flange relief space (S)
The flanges (38) and (38) are deformed so as to escape into the space. Fig. 7 shows the structure of the retainer (3) in which the flange (38) breaks along the inner periphery of the retainer (3) when the tightening cylinder (2) is tightened.
It is intended to be separated from. For this reason, the connected cylinder
The protruding part (11) of the inner circumference of (1) is attached to the main part (3) of the retainer (3).
0) While approaching the outer circumference, the inner diameter of the protruding portion (11) in the connected cylinder (1) and the outer diameter of the retainer pressing surface (28) in the tightening cylinder (2) almost coincide with each other. ing. As a result, when the tightening cylinder (2) is tightened, the inner peripheral portion of the flange (38) is cut by being sandwiched between the protrusion (11) and the retainer pressing surface (28) of the tightening cylinder (2). Thus, the flange (38) is separated from the main body (30) of the retainer (3). Also in this case, a bent piece (35) as a reinforcing projection is provided around the entire periphery of the flange (38) so that an obstacle hits the thin-walled flange (38). This makes it difficult to deform.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a partially cutout of a flexible pipe joint according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a flexible pipe joint according to the first embodiment of the present invention.

FIG. 3 is an operation explanatory view of the flexible pipe joint according to the first embodiment of the present invention, showing a state immediately before the bellows pipe (91) is inserted into the retainer (3).

FIG. 4 is an operation explanatory view of the flexible pipe joint according to the first embodiment of the present invention, showing a state in which a bellows pipe (91) is inserted through a retainer (3).

FIG. 5 is an operation explanatory view of the flexible pipe joint according to the first embodiment of the present invention, showing a state in which the tightening of the tightening cylinder (2) is completed.

FIG. 6 is a sectional view of an embodiment in which a flange (38) is provided forward from a rear end of a retainer (3).

FIG. 7 is a cross-sectional view of a flexible pipe joint according to an embodiment in which a flange (38) breaks at an inner peripheral portion and separates from a retainer (3) with tightening of a tightening cylinder (2).

FIG. 8 is an explanatory view of a conventional example.

FIG. 9 is an explanatory view of an improvement plan.

[Explanation of symbols]

(1) ・ ・ ・ Connected cylinder (2) ・ ・ ・ Tightening cylinder (3) ・ ・ ・ Retainer (11) ・ ・ ・ Protrusion (38) ・ ・ ・ Flange (35) ・ ・ ・ Bent piece (91 ) ・ ・ ・ Collapsible tube

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Higashitaro Higashiro 18 Kaname Toba Hanana, Minami-ku, Kyoto 1 Inside Fujii Alloy Manufacturing Co., Ltd. No. 1 Inside Fujii Alloy Manufacturing Co., Ltd. (56) References JP-A-1-71291 (JP, U) Patent 2958661 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 33 / 00

Claims (4)

(57) [Claims] 1. A tightening cylinder screwed into one end of a connected cylinder (1).
(2) A retainer (3) surrounding the outer periphery of the bellows pipe (91) projecting into the connected cylinder (1) from the inside, wherein the retainer (3) is screwed. The tightening tube (2) is forcibly pushed into the retainer storage chamber from an initial position in the connected tube (1) and contracts in diameter to reduce the diameter of the bellows tube (9).
In the flexible pipe joint which is fitted to the valley of (1) in an expansion-prevented state, a protrusion (11) provided on the inner periphery of the connected cylinder (1); The retainer (3) is provided on the outer periphery of the retainer (3) so as to engage from behind in the screwing direction of the tightening cylinder (2), and the engaging force is applied from the tightening cylinder (2) to the retainer (3). Flange broken as mating is released
A flexible pipe joint comprising (38), wherein an outer peripheral portion of the flange (38) is set to be thicker than other portions. 2. The flexible pipe joint according to claim 1, wherein the flange (38) is continuous over the entire circumference in the outer circumferential direction of the retainer (3), and the outer circumference of the flange (38). A flexible pipe joint whose part is set to be thicker than other parts over the entire circumferential direction. 3. The flexible pipe joint according to claim 1, wherein the means for setting the outer peripheral portion of the flange (38) to be thicker includes the outer peripheral portion of the flange (38) and the tightening means. A flexible pipe joint that is a raised ridge that is bent rearward in the screwing direction of the tube (2). 4. The flexible pipe joint according to claim 1, wherein the retainer (3) is formed by the tightening cylinder (2) screwed into the connected cylinder (1). In the pushed state, a flange recessed toward the joint center axis from the tip of the protrusion (11) is provided at a portion that is continuous with the flange (38) in the screwing direction of the tightening cylinder (2). A flexible pipe joint in which an escape space is formed.