JP3331335B2 - Flexible pipe joint - Google Patents

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 flexible pipe joint to which a flexible metal bellows pipe is connected.

[0002]

2. Description of the Related Art Japanese Patent No. 268623 describes a flexible pipe joint.
No. 7 discloses a technique disclosed in Japanese Patent Application Laid-Open No. H07-139,873. As shown in FIGS. 5 and 6, the flexible pipe joint includes, for example, a joint body (5) connected to a gas inlet (G) of a gas cock, and a joint body (5).
Tightening tube (51) screwed from the rear (left end in the drawing)
An annular retainer (52) rotatably connected to the front end of the tightening cylinder (51) and pushed into the tapered inner peripheral surface (50) of the joint body (5) by tightening the tightening cylinder (51). FIG. 5 is a cross-sectional view showing a temporarily tightened state of the tightening cylinder (51) before final tightening, and FIG. 6 shows a state where the tightening of the tightening cylinder (51) is completed (the bellows tube (8) FIG. 4 is a cross-sectional view showing the state ()).

The retainer (52) is divided into a plurality of divided members by a plurality of slits formed in the circumferential direction from the front end thereof, and the front end of the retainer (52) is fitted into the valley of the bellows pipe (8). (53) is formed and the rear end is a tightening cylinder
It is rotatably mounted on the front end of (51).

In this case, a tightening cylinder (51) is attached to a joint body (5).
Between the bite portion (53) of the retainer (52) and the pipe receiving surface (55) located forward of the tapered inner peripheral surface (50) of the joint body (5). 8) An interval approximately corresponding to the size of one mountain is formed, and the biting portion (53) is formed.
Until it reaches the temporary fixing position corresponding to the retainer expansion allowance recess (54) formed in the joint body (5).
Tighten. In order to position at the temporary fixing position,
A spacer ring (56) is interposed between the front end of the tightening cylinder (51) and the rear end of the joint body (5).

A bellows tube (8) is inserted from the rear of the tightening tube (51) into the flexible pipe joint where the tightening tube (51) is set at the temporary fixing position, and the front end of the retainer (52) is expanded. While elastically deforming in the opening direction, the insertion end of the bellows pipe (8) is projected forward from the retainer (52), and the pipe receiving surface (5
Make contact with 5). At this time, since the front end of the retainer (52) is fitted into the retainer expansion allowance concave portion (54), the expansion of the retainer (52) is not hindered, and the bellows tube (8 ) Can be inserted.

In this state, the tightening cylinder (51) is tightened to the final tightening position. Then, as shown in FIG. 6, the retainer (52)
Is pushed forward by the fastening cylinder (51), moved forward (to the right in the drawing) of the joint body (5), and pushed into the tapered inner peripheral surface (50). Since the retainer (52) is formed into an annular body having a plurality of slits formed in the circumferential direction from the front end side, the retainer (52) is pushed into the tapered inner peripheral surface (50), The diameter is reduced from the front end side along the tapered inner peripheral surface (50), and the bite portion (53) provided at the front end of the retainer (52) is cut into the valley of the bellows tube (8). Will be included. By further tightening the tightening cylinder (51), the insertion end of the bellows tube (8) inserted forward of the bite portion (53) of the tapered inner peripheral surface (50) is located at the front of the bite portion (53). And between the tube receiving surface (55) and the bellows tube (54).

[0007]

In this conventional device,
If the fastening cylinder (51) equipped with the retainer (52) is temporarily fixed by screwing it to the joint body (5), the bellows tube (8) can be inserted and tightened without disassembly at the time of construction. By tightening the tube (51) to the final tightening position, the bellows tube (8) can be connected, and when the bellows tube (8) is not inserted correctly, the tightening tube (51) is tightened. Since the bellows tube (8) is easily pulled out later, the bellows tube (8)
Is in the correct connection state.

However, in the case where the joint body (5) is previously attached to the gas inlet of the gas cock which is difficult to see from the outside and is arranged in a narrow place,
When the tightening cylinder (51) is screwed into (5) and the tightening cylinder (51) is positioned at the temporary fixing position, the spacer ring (56) is removed, and the bellows tube (8) is inserted and tightened again. Since the tube (51) must be tightened to connect and fix the bellows tube (8), the operation of connecting the bellows tube is difficult and inconvenient. or,
The fastening cylinder (51) and the retainer (52) may be screwed into the joint body (5) in a state where it is set in the bellows tube (8) in advance. Once the tightening cylinder (51) and the retainer (52) are loosened, the tightening cylinder (51) is loosened once and removed from the joint body (5), and the tightening cylinder (51) and the retainer (52) are separated. After setting in the bellows pipe (8), the tightening cylinder (51) must be tightened again to the joint body (5), and the construction work is troublesome.

The present invention provides a tubular joint main body, a tightening cylinder inserted into the joint main body from the rear and positioned at a temporary fixing position in the joint main body, and a rotating front end of the tightening cylinder. It consists of an annular retainer that is freely connected,
The tightening cylinder holds the bellows tube in a temporarily fixed state at the temporary fixing position, and the retainer is configured so that the front end portion can be freely expanded and contracted, and the tightening cylinder is finally tightened from the temporary fixing position. When tightened to the position, the flexible pipe joint is pushed into the retainer accommodating chamber in the joint body while being externally fitted to the bellows tube, and the front end is maintained in the expansion preventing state. It is an object of the present invention to make it possible to easily temporarily attach the attached cylinder to further facilitate the work of connecting the bellows tube. <1>

[0010]

Means for Solving the Problems The first means of solving the present invention to solve the above-mentioned problem is as follows: "The flange portion integrally projects from the outer surface of the retainer, and An engagement protrusion with which the flange engages in a disengagement direction, a female screw portion having a larger diameter than the outer diameter of the flange, and an inlet cylindrical portion having an inner diameter substantially matching the root diameter of the female screw portion; Are successively formed toward the rear open end of the joint body,
A male screw portion is formed on the outer periphery of the tightening cylinder so as to be screwed with the female screw portion. Before the engagement of the male screw portion and the female screw portion starts, the tightening cylinder is temporarily inserted into the joint body. Positioning means is provided to be inserted to the stop position and to prevent further pushing of the tightening cylinder, and the positioning by the positioning means is released as the male screw portion and the female screw portion are screwed together. Configuration.

The above solution works as follows. When the tightening cylinder having the retainer connected to the front end portion is accommodated in the joint body from the rear thereof, the tightening cylinder has a flange portion that is not caught by the female screw portion in the joint body and the male screw portion of the tightening cylinder. Is inserted into the joint body while contacting the inner peripheral surface of the inlet tubular portion of the joint body. Then, the tightening cylinder is positioned at the temporary fixing position in the joint body by the positioning means, and is not inserted any more. Further, at this time, since the flange portion is engaged with the engaging projection in the detaching direction, the tightening cylinder does not accidentally fall out of the joint body. A bellows tube as a flexible tube is inserted into the temporarily assembled flexible tube joint from behind the tightening tube. The foremost peak of the bellows tube projects forward of the retainer while expanding the diameter of the front end of the retainer, and the front end of the retainer fits over the valley of the bellows tube. In this state, tighten the tightening cylinder. By this tightening, the positioning state at the temporary fixing position by the positioning means is released, and the tightening cylinder is moved forward in the joint body. Thereafter, as in the conventional case, the retainer is pushed into the retainer housing chamber in the joint body while pressing the ridge of the bellows tube, and the front end thereof is held in the expansion preventing state, and the tightening cylinder is finally tightened. When tightened to the position, the connection of the bellows tube will be completed.

<Item 2> In the invention described in the above item 1, it is preferable that "an annular groove is formed in the joint body, and the engaging projection is formed on a rear edge of the annular groove. When the annular convex portion is extended from the front edge, the positioning means is the annular convex portion, and when the tightening cylinder is inserted into the joint main body, before the engagement of the male screw portion and the female screw portion starts, The flange is fitted into the annular groove beyond the engagement protrusion and engages the annular protrusion from the insertion direction, so that the tightening cylinder is in the temporary fixing position in the joint body. The flange portion is pushed over the annular convex portion by screwing by engagement of the male screw portion and the female screw portion. " When inserted inside, the male thread is screwed into the female thread The flange portion is the penetration of the insertion direction into the annular convex portion with fitted into the annular groove to contact with the fitting body tube tightening is prevented Before. By the time the flange portion comes into contact with the annular convex portion, the flange portion first engages with the engaging projection formed rearward of the annular convex portion, but the tightening cylinder is forcibly inserted into the joint body. Accordingly, the degree of engagement of the flange with the engagement projection is set so that the flange is received in the annular recess beyond the engagement projection. The state in which the flange is engaged with the annular projection in the insertion direction and the insertion of the tightening cylinder is prevented is the state in which the tightening cylinder is positioned at the temporary fixing position. When the bellows tube is inserted into this and the tightening cylinder is tightened, the flange portion engaged with the annular convex portion is deformed and forcibly disengaged from the annular convex portion, and The collar is pushed over the annular protrusion.
Thereafter, as in the conventional case, the tightening cylinder may be tightened to the final tightening position to connect the bellows tube.

<3> In the invention described in detail in the above item 1, the positioning means may be a crest located at the tail end of the female screw portion, and when the tightening cylinder is inserted into the joint body, The front end of the male screw portion is in contact with the rearmost mountain portion of the female screw, whereby the tightening cylinder is positioned at the temporary fixing position in the joint main body. When the tightening cylinder is housed in the joint body, the front end of the male thread portion of the tightening cylinder abuts the rear end of the female screw section in the joint body, so that the tightening cylinder is temporarily fixed in the joint body. At the same time, the flange is engaged with the engaging projection in the detaching direction. Then, the bellows tube may be connected by tightening the tightening cylinder.

<4> In the invention described in the above item 3, the tapered cylindrical portion which is reduced in diameter toward the front is formed in the joint main body, and the engaging projection is a minimum diameter portion of the tapered cylindrical portion. And the flange portion is set so as to engage with the minimum diameter portion of the tapered tube portion. ”In this case, the tightening tube is temporarily fixed in the joint body by the same operation as in the above item 3. The flange is positioned at the position and the one-way engagement of the flange portion with the minimum diameter portion is achieved.

<5> In the invention described in each of the above items,
"The degree of engagement of the flange portion with the engagement projection is set to such an extent that it can be released by forcibly pulling out the fastening cylinder at the temporary fixing position from the joint body." If the tightening cylinder is forcibly inserted into the joint body, the tightening cylinder can be positioned at the temporary fixing position, and the state is maintained unless the forcible tube is forcibly pulled out. Then, when the bellows tube inserted from the rear end of the tightening cylinder at the temporary fixing position or the rear thereof is pulled out, the tightening cylinder can be removed from the joint body together with the retainer.

<Section 6> In the invention described in each of the above sections, in the invention described in the above sections, "the retainers are located side by side in the circumferential direction through slits cut from the front end, and are mutually connected at a thin portion at the rear end. A plurality of metal split members connected at the front end and elastically expanded and contracted; and an auxiliary cylinder made of an elastic material such as rubber or synthetic resin mounted on the outside of the split member. At the front end, a biting portion that fits into the valley of the bellows tube projects inward, and the flange is provided integrally with the auxiliary cylinder, and is located rearward of the retainer housing chamber in the joint body. Is provided with a retainer expansion allowance concave portion that allows the front end portion of the retainer to expand, and the bite portion of the retainer corresponds to the retainer expansion allowance concave portion while being positioned at the temporary fixing position. Is set to Intended, retainer, a metal partition member and the elastic synthetic resin or rubber tubular member is that of relatively rotatable structure assembled integrally.
When the bellows tube is forcibly pushed in from the back of the tightening cylinder at the temporary fixing position in the joint main body, the split member expands the retainer with the thin part at the rear end as a fulcrum in the same manner as the conventional one. The bite portion expands at a position corresponding to the allowable concave portion, and the peak portion of the bellows tube projects forward from the bite portion. Thereafter, the split member is returned to the initial state by the elastic return force of the auxiliary cylinder, and the biting portion bites into the valley following the peak of the bellows tube. In this state, the bellows tube can be connected by tightening the tightening cylinder until it reaches the final tightening position.

[0017]

According to the present invention, it is possible to reliably position the tightening cylinder at the temporary fixing position before the bellows tube is inserted into the joint body simply by inserting the tightening cylinder into the joint body without screwing it.
The work of attaching the tightening cylinder to the temporary fixing position on the joint main body attached to a place where it is difficult to perform construction work, such as a narrow place, becomes easy. There is no inconvenience that the tightening cylinder temporarily fixed in the joint body is accidentally dropped because the flange is engaged with the engaging projection in the pulling-out direction.

According to the second aspect, the tightening cylinder is inserted into the joint body, and the flange is brought into contact with the annular convex portion in the inserting direction, whereby the tightening cylinder is positioned at the temporary fixing position. Therefore, it can be recognized by the feel of the hand that the tightening cylinder is positioned at the temporary fixing position in the joint body,
Temporary fastening of the tightening cylinder becomes easier and more reliable. Further, since there is no need to separately provide a positioning member for positioning the tightening cylinder such as a spacer ring at the temporary fixing position, the number of parts is reduced, the assembly becomes easy, and the cost can be reduced. .

In the case of item 3, the tightening cylinder is inserted into the joint main body, and the front end of the male screw portion of the tightening cylinder is brought into contact with the rear end of the female screw portion in the joint main body. Since the attachment cylinder can be positioned at the temporary fixing position, the temporary fixing of the fastening cylinder can be easily performed in the same manner as described in item 2.

According to the fourth aspect, the flange can be one-way engaged with the minimum diameter portion of the tapered tubular portion provided in the joint body, so that the engagement of the flange in the pull-out direction is easy, and The retaining effect of the attached cylinder also increases.

In the item (5), since the tightening cylinder can be detachably attached to the joint body together with the retainer, for example, a connection in which the tightening cylinder and the retainer are screwed into the joint body with the bellows tube set in advance. When the method is adopted, both the fastening cylinder and the retainer that have been temporarily assembled in the joint body in advance are removed from the joint body, and the fastening cylinder and the retainer are set in the bellows tube and then pulled out again into the joint body. The work can be easily performed without troublesome work for mounting in the stopped state. Further, since the tightening cylinder and the retainer temporarily fixed to the joint body together with the bellows tube can be removed from the joint body by pulling the bellows tube, various parts can be easily replaced before the final construction. Can be done.

In the item (6), the flange portion is integrally provided on an elastically deformable synthetic resin auxiliary cylinder, so that the engagement of the flange portion with the engagement projection or the release thereof can be performed smoothly. Can be.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. As shown in FIGS. 1 and 2, a flexible pipe joint according to a first embodiment of the present invention includes a tubular joint body (1) and a front (left side in the drawing) of the joint body (1). ), And a retainer (3) attached to the front end of the fastening tube (2). FIG. 1 shows the fastening tube (2) connected to the joint body. FIG. 2 shows a state where it is positioned at a temporary fixing position in (1), and FIG. 2 shows a state in which the tightening cylinder (2) is tightened to the final tightening state and the bellows tube (8) is connected. Note that the joint body (1), the tightening cylinder (2), and the division member (30) which is a part of the retainer (3) are formed of a metal material such as brass.

First, the joint body (1) will be described. In the joint body (1), for example, a male screw (100) for screwing and connecting to a gas inlet of a gas cock is engraved on an outer periphery of a front end. Then, on the inner periphery of the joint body (1), from the rear open end which is the screw-in side end of the tightening cylinder (2) described later, the inlet cylinder (16) and the tightening cylinder (2) Female thread part (13) into which male thread part (29) is screwed, tapered cylindrical part (4) with diameter decreasing toward the front
Are formed.

The inner diameter of the minimum diameter portion of the tapered cylindrical portion (4) is
The inner diameter of the inlet cylinder (16) is set to be slightly smaller than the diameter of the female thread (13), and the inner diameter of the inlet cylinder (16) is a female thread (13).
Valley diameter is almost matched.

Further, further in front of the tapered tubular portion (4), a retainer expansion allowable concave portion (12) and a cylindrical retainer storage chamber (17) are formed continuously, and this retainer storage chamber is formed.
Further in front of (17), a small-diameter gas passage (18) is formed. The rear end of this gas passage (18) and the retainer accommodation chamber (1
An annular pipe receiving surface (15) is formed between the front end of (7) and the inner peripheral surface of the retainer chamber (17) at right angles. An annular groove (19) is formed outside the pipe receiving surface (15), and a bellows tube (8) is formed in the annular groove (19).
An O-ring (14) for ensuring airtightness is mounted.

Next, the tightening cylinder (2) will be described. The tightening cylinder (2) is composed of a hexagonal spanner engaging portion (22) and a cylindrical portion (23) following the engaging portion.

The cylindrical portion (23) is composed of a large-diameter cylindrical portion (23a) close to the wrench engaging portion (22) and a small-diameter cylindrical portion (23b) following the large-diameter cylindrical portion (23b). On the outer periphery of the male screw part mentioned above
(29) is engraved. On the outer peripheral surface near the front end of the small-diameter cylindrical portion (23b), an engagement recess (20) for engaging a rear end of a retainer to be described later is formed in an annular shape and the inner peripheral surface is formed. Has a step (21) formed in a step shape.

The diameter of the male thread portion (29) in the large-diameter cylindrical portion (23a) substantially matches the inner diameter of the inlet cylindrical portion (16) of the joint body (1). The portion (23b) is set to a size that can be inserted forward of the tapered tube portion (4).

Further, a concave portion (24) extending all around the inner periphery of the spanner engaging portion (22) is formed.
(24) is loaded with an annular packing (27). The annular packing (27) is for preventing rainwater or the like from entering the flexible pipe joint by coming into contact with a synthetic resin covering pipe (80) covering the outer periphery of the bellows pipe (8). is there.

Finally, the retainer (3) will be described.
The retainer (3) is composed of a plurality of metal split members (30) connected at a thin portion at the rear end and an elastic synthetic resin auxiliary cylinder (31) rotatably fitted to the split members. A fitting recess (3) for fitting the front end of the auxiliary cylinder (31) is fitted on the outer surface of (30).
6) is formed, and a step portion is
(35) is formed. Insert the auxiliary cylinder (31) into the fitting recess (36)
In a state where both are integrated into each other, a gap having a width substantially equal to the height of the step portion (35) is provided between the dividing member (30) and the auxiliary cylinder (31) in the rear region thereof. The portion is formed, and the auxiliary cylinder (31) further extends rearward, and an engagement claw (34) is formed at the extended end.

In the middle of the outer surface of the auxiliary cylinder (31), an annular flange is provided.
(32) projecting integrally, the outer diameter of which is smaller than the thread diameter of the female screw portion (13) and the tapered cylindrical portion.
It is assumed that it is configured to be slightly larger than the inner diameter of the minimum diameter part of (4).

The auxiliary cylinder (31) is provided with a plurality of slits from both front and rear ends, so that both ends of the auxiliary cylinder (31) are easily bent outward. As a result, the front end of the auxiliary cylinder (31) expands its inner diameter, and
0), and can be rotatably fitted in the fitting concave portion (36), and the front end of the tightening cylinder (2) has a clearance in the rear region of the retainer (3). When inserted, the inner diameter of the rear end of the auxiliary cylinder (31) expands, and the front end of the tightening cylinder (2) can be fitted into the gap.

Even when the auxiliary cylinder (31) is mounted,
The front end of the split member (30) can be expanded or reduced with the rear end as a fulcrum, and the front end of the retainer (3) in a state where the front end of the split member (30) is reduced in diameter. The outer diameter is set to substantially match the inner diameter of the retainer storage chamber (17).

The front surface of the split member (30) is a flat surface, and its inner edge protrudes inward, so that the diameter of the tip side of the retainer (3) is free from expansion or contraction. The diameter of the bellows (81) of the bellows tube (8) is smaller than the diameter of the bellows tube (81) and the bellows tube (8)
The bite portion (33) has an inner diameter slightly larger than the diameter of the valley portion (82).

The procedure for assembling the flexible pipe joint will be described. First, the auxiliary cylinder (31) is divided into
The retainer (3) is formed by being fitted from behind the (30), and the front end of the tightening cylinder (2) is fitted from behind. Then
As shown in FIG. 1, the step (21) of the tightening cylinder (2) is
0) abuts the rear end and the tip of the tightening cylinder (2)
(35), and at the same time, the engaging claw (34) is
0) is engaged. As a result, the retainer (3) is rotatably mounted on the tightening cylinder (2).

The distance from the rear surface of the flange portion (32) to the front end of the male screw portion (29) (the boundary portion between the large-diameter cylindrical portion (23a) and the small-diameter cylindrical portion (23b)) is a tapered cylindrical portion. Part (4) from the minimum diameter part to the female screw part (1
3) The distance is set to be longer than the distance to the rear end (the boundary between the female screw part (13) and the inlet cylinder part (16)).

When the coupling body of the tightening cylinder (2) and the retainer (3) is inserted into the inlet cylinder (16) of the joint body (1), the tapered cylinder (4)
The flange portion (32) is one-way engaged with the minimum diameter portion, and at the same time, the foremost peak portion of the male screw portion (29) comes into contact with the rearmost peak portion of the female screw portion (13). This prevents the tightening cylinder (2) from being further inserted into the joint body (1) and tightens the tightening cylinder (2).
Will be kept in the retaining state. This state
This is a state in which the tightening cylinder (2) is positioned at the temporary fixing position in the joint body (1). In this state, the front end of the retainer (3) is located at the retainer expansion allowing portion (12) of the joint body (1), and the front end face of the retainer (3) and the pipe receiving surface (15) opposed thereto. Is set to substantially match the size of one peak of the bellows tube (8).

The inner diameter of the inlet cylinder (16), which substantially matches the root diameter of the female screw (13), substantially matches the peak diameter of the male screw (29). When the large-diameter portion (23a) of the tightening cylinder (2) is inserted into the inside, the inner surface of the inlet cylindrical portion (16) will function as a guide cylinder for the large-diameter portion (23a). The insertion posture of the cylinder (2) does not fluctuate.

Next, a bellows pipe (8), which is a flexible pipe, is inserted into the flexible pipe joint from the rear of the tightening cylinder (2). Then, as shown by the solid line in FIG. 1, the foremost peak (81) of the bellows tube (8) comes into contact with the bite portion (33) of the retainer (3).

From this abutting state, the bellows tube (8) is further pushed in so that the front end of the dividing member (30) is expanded, and the peak (81) is passed between the biting portions (33). At this time, since the front end is located in the retainer expansion allowing recess (12), the front end side of the retainer (3) is located at the retainer expansion allowing recess.
Expand while fitting into (12), then split member (30)
Is returned to the free state by the elastic return force of the auxiliary cylinder (31), and as shown by the two-dot chain line in FIG. Bites into the bellows tube
Only the foremost ridge (81) of (8) protrudes forward from the retainer (3).

From this state, the male screw portion (29) of the tightening cylinder (2)
Into the female screw (13) of the fitting body (1) and tighten the tightening cylinder (2).
In a state fitted outside the valley (82), it is pushed into the retainer accommodating chamber (17), and is kept in the expansion preventing state.

Thus, the bellows tube () located between the front surface of the biting portion (33) and the open edge of the annular groove (19) corresponding to the outer edge of the tube receiving surface (15). 8) Foremost mountain
(81) is a part of a mountain portion (81) that is pressed against the open edge of the annular groove (19) by the front surface of the biting portion (33), is crushed, and protrudes outward from the outer edge. Is pushed into the annular groove (19), and is pressed together with the O-ring (14) in a press-contact state by the front surface of the dividing member (30). This is the state where the connection of the bellows tube (8) is completed.

FIGS. 3 and 4 are explanatory views showing a flexible pipe joint and a bellows pipe insertion mode according to a second embodiment of the present invention. In this embodiment, an annular concave groove (10) is formed from the rear open end of the joint body (1) to the inlet cylindrical part (16), the female screw part (13), and the annular concave groove. An annular projection (11a) is formed annularly over the entire circumference continuously from the front edge of (10), and a second engagement projection (11b) is formed at the rear edge. It has a configuration.

The inner diameter of the second engagement protrusion (11b) of the inner diameter of the joint body (1) projects inward so as to be slightly smaller than the diameter of the female screw portion (13). And the annular projection (11
The inner diameter of a) is provided to be even smaller than the inner diameter of the second engagement protrusion (11b). In other words, female screw
The degree of inward projection of the second engagement projection (11b) is greater than the peak of (13), and the annular projection (11a) is larger than the second engagement projection (11b).
It is assumed that the respective dimensional relations are set so that the degree of protrusion is further increased.

The inner diameter of the inlet cylinder (16) is substantially equal to the root diameter of the female screw (13), as in the first embodiment, and is located in the front area of the annular projection (11a). Is also similar to that of the first embodiment.

The tightening cylinder (2) comprises a wrench engaging portion (22) and a cylindrical portion (23), as in the first embodiment.
The large-diameter cylindrical portion (23a) of the cylindrical portion (23) is formed with a male screw portion (29) that is screwed into the female screw portion (13), and an engaging recess is formed on the outer surface of the small-diameter cylindrical portion (23b). (20) is formed. The small-diameter tube (2
3b) is set to a size that can be inserted forward of the engagement protrusion (11a).

Similarly to the first embodiment, the retainer (3) is formed on a plurality of metal dividing members (30) connected at the rear end and openable at the front end, and formed on the outer surface thereof. An auxiliary cylinder (31) made of an elastic synthetic resin attached to the recess so as to be fitted externally, and the rear end of the divided member (30) is fixed to the tightening cylinder (2).
The tightening cylinder (2) and the retainer (3) are connected by rotatably engaging with the engaging concave portion (20).

It should be noted that the auxiliary cylinder (3
The outer diameter of the rear side of the concave portion is set to be slightly larger than the inner diameter of the auxiliary cylinder (31) so that the outer diameter of the concave portion can be fitted to 1), and the outer diameter of the front region of the concave portion is also set. Is formed so as to substantially match the outer diameter of the auxiliary cylinder (31).

At the rear end of the auxiliary cylinder (31), an annular flange (32) is provided.
Are formed integrally so as to protrude outward, and the outer diameter thereof is smaller than the ridge diameter of the female screw portion (13) and slightly smaller than the inner diameter of the second engagement protrusion (11b). It is set large.

When the retainer (3) is attached to the tightening cylinder (2), the front end portion of the male screw portion (29) (from the large-diameter cylindrical portion (23a)) The distance from the annular projection (11a) of the joint body (1) to the rear end of the female thread (13) (the female thread (13) and the inlet cylinder) (The boundary with (16)). Thus, when the flange (32) is in contact with the annular projection (11a), the female screw (13) of the joint body (1) and the male screw of the tightening cylinder (2) are used.
(29) does not reach the screwed state.

In order to assemble the flexible pipe joint of this embodiment, first, the auxiliary cylinder (31) is housed in the concave portion of the dividing member (30) so as to be fitted externally, and the two are integrated together.
The rear end of (30) is fitted into the engaging recess (20) at the front end of the tightening cylinder (2) from outside, and the retainer (3) and the tightening cylinder (2) are integrated, and the joint body ( Insert the retainer (3) with the tightening cylinder (2) attached to the front end into 1).

When the male thread portion (29) is inserted into the inner peripheral surface of the inlet cylinder portion (16) while being in contact with the inner peripheral surface, the flange portion (32) is caught by the second engagement protrusion (11b). However, since the degree of catch is small, when the tightening cylinder (2) is forcibly pushed in, the flange portion (32) easily exceeds the second engagement protrusion (11b), and the engagement recess ( At the same time, it fits into the inside and comes into contact with the annular convex portion (11a).

This state is a state in which the tightening cylinder (2) is positioned at the temporary fixing position in the joint main body (1), and the flange portion (32) has an annular groove (10) in the joint main body (1). ), The first and second engagement projections (11a) and (11b) are in a state where movement in both the front and rear directions is prevented. In this state, the male thread (29) of the tightening cylinder (2) is connected to the female thread (1) of the joint body (1).
3), the front end of the retainer (3) is located at the retainer expansion allowing portion (12), and the front end face of the retainer (3) and the pipe receiving surface (15) facing the front end face. Is set to substantially match the size of one peak of the bellows tube (8), as in the case of the first embodiment.

Thereafter, in the same manner as in the first embodiment, the bellows tube (8) is inserted from behind the tightening cylinder (2), and the bite portion (33) of the retainer (3) is inserted. Also, after projecting the foremost peak (81) of the bellows tube (8) forward, the male thread (29) is screwed into the female thread (13).
2) is pressed forward by the fastening tube (2) while being in contact with the annular convex portion (11a). Since the flange portion (32) is made of the same elastic synthetic resin as the auxiliary cylinder (31), it is bent or cut rearward on the base end side from the contact portion with the annular convex portion (11a) by the pressing. Will be done. Thereby, the collar (32)
Is disengaged from the engagement projection (11a), and then further tightened cylinder
By tightening (2), the retainer (3) is pushed into the retainer chamber (17) with the bite portion (33) fitted outside the valley (82) of the bellows tube (8). It will be.

In each of the above embodiments, the joint body (1)
The bellows tube (8)
The method of connecting the bellows tube to insert the bellows tube was explained. With the fastening tube (2) and the retainer (3) pre-mounted on the insertion end of the bellows tube (8), the bellows tube (8) was tightened. (2) and retainer (3)
At the same time, they may be inserted and connected to the joint body (1).

In this case, the fastening cylinder (2) and the retainer (3) temporarily fixed to the joint body (1) before construction must be temporarily removed, but the fastening cylinder housed in the temporarily fixed state is required.
(2) is not screwed to the joint body (1), and in the case of the first embodiment, the flange portion (32) and the minimum diameter portion of the tapered tubular portion (4) The degree of engagement, in the case of the second embodiment, the flange (32) and the second engagement protrusion (11b)
Since the degree of engagement with the fastening cylinder (2) is set to be small, the tightening cylinder (2) in the temporary fixing position is easily pulled out of the joint body (1) together with the retainer (3) by being forcibly pulled backward. It will be. As described above, since the connected body of the tightening cylinder (2) and the retainer (3) can be easily pulled out from the joint body (1), the tightening cylinder can be removed from the joint body (1) before construction.
There is no time and effort to remove the (2) and the retainer (3).

Even if the bellows tube (8) is housed in the joint body (1) together with the tightening tube (2) and the retainer (3), the state before the final tightening of the tightening tube (2) is obtained. By pulling out the bellows tube (8), both the tightening cylinder (2) and the retainer (3) can be pulled out from the joint body (1), so that various parts can be easily replaced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view showing a state in which a tightening cylinder of a flexible pipe joint according to a first embodiment of the present invention is positioned at a temporary fixing position.

FIG. 2 is a partially cutaway sectional view showing a state in which the tightening cylinder of the flexible pipe joint according to the first embodiment of the present invention has been tightened to a final tightening position.

FIG. 3 is a partially cutaway sectional view showing a state in which a tightening cylinder of a flexible pipe joint according to a second embodiment of the present invention is positioned at a temporary fixing position.

FIG. 4 is a partially cutaway sectional view showing a state in which a tightening cylinder of a flexible pipe joint according to a second embodiment of the present invention has been tightened to a final tightening position.

FIG. 5 is an explanatory view showing a state in which a bellows tube is inserted into a conventional flexible pipe joint before tightening.

FIG. 6 is an explanatory view showing a state in which a bellows tube is inserted into a conventional flexible pipe joint after completion of tightening.

[Explanation of symbols]

 (1) ・ ・ ・ Coupling body (13) ・ ・ ・ Female thread (16) ・ ・ ・ Inlet cylinder (17) ・ ・ ・ Retainer storage chamber (2) ・ ・ ・ Tightening cylinder (29) ・ ・ ・Male thread part (3) ・ ・ ・ Retainer (32) ・ ・ ・ Flange part (33) ・ ・ ・ Bite-in part (8) ・ ・ ・ Collapsible tube

────────────────────────────────────────────────── ─── Continuation of the front page Examiner Kazumi Kawamukai (56) References JP-A-9-210274 (JP, A) JP-A 8-159350 (JP, A) JP-A 2000-2381 (JP, A) ( 58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 33/00 F16L 33/28

Claims (6)

(57) [Claims] 1. A tubular joint body, a tightening tube inserted into the joint body from the rear and positioned at a temporary fixing position in the joint body, and rotatably connected to a front end of the tightening tube. The tightening cylinder is configured to hold the bellows tube in a temporarily fixed state at the temporarily fixed position, and the retainer is configured such that a front end portion is freely expandable and contractable and the tightening is performed. When the tube is tightened from the temporary fixing position to the final tightening position, it can be pushed into the retainer accommodating chamber in the joint body while being externally fitted to the bellows tube, so that the front end can be maintained in the expansion preventing state. In the flexible pipe joint, a flange portion integrally projects from an outer surface of the retainer, and an engagement protrusion with which the flange portion is engaged in a disengagement direction and a mountain larger than an outer diameter of the flange portion are formed in the joint body. Female screw part of the diameter An inlet cylinder having an inner diameter substantially matching the valley diameter of the joint portion is formed continuously in order toward the rear open end of the joint body, and is screwed to the female screw on the outer periphery of the tightening cylinder. A male screw portion is formed, and before the engagement of the male screw portion and the female screw portion starts, the tightening cylinder is inserted into the joint body up to the temporary fixing position, and the further tightening cylinder is further inserted. Positioning means for preventing pushing is provided, and positioning by the positioning means is released when the male screw portion and the female screw portion are screwed together. 2. The flexible pipe joint according to claim 1, wherein an annular groove is formed in the joint body, and the engagement protrusion is formed on a rear edge of the annular groove, and a front side is formed. Extending the annular convex portion from the edge of the, the positioning means is the annular convex portion, When the fastening cylinder is inserted into the joint body, before the engagement of the male screw portion and the female screw portion, The flange is fitted into the annular groove beyond the engagement protrusion and engages the annular protrusion from the insertion direction, whereby the tightening cylinder is positioned at the temporary fixing position in the joint body. The flexible pipe joint, wherein the flange portion is pushed over the annular convex portion by screwing by engagement of the male screw portion and the female screw portion. 3. The flexible pipe joint according to claim 1, wherein the positioning means is a crest located at the end of the female screw portion, and the female member is provided when the tightening cylinder is inserted into the joint body. The fastening cylinder is positioned at the temporary fixing position in the joint body by contacting the crest at the front end of the male screw with the crest at the tail of the screw. Flexible fittings. 4. The flexible pipe joint according to claim 3, wherein a tapered cylindrical portion that decreases in diameter toward the front is formed in the joint main body, and the engagement protrusion is formed at a minimum diameter portion of the tapered cylindrical portion. A flexible pipe joint that is formed and the flange portion is set to engage with the minimum diameter portion of the tapered tubular portion. 5. The flexible pipe joint according to claim 1, wherein a degree of engagement of the flange portion with the engagement protrusion is determined by changing the degree of engagement between the fastening cylinder at the temporary fixing position and the joint. A flexible pipe joint set to such an extent that it can be released by forcibly pulling it out of the main body. 6. The flexible pipe joint according to claim 1, wherein the retainers are arranged side by side in a circumferential direction through a slit cut from the front end and have a thin wall at a rear end. A plurality of metal split members whose front ends are resiliently expanded and contracted by being connected to each other, and an auxiliary cylinder made of an elastic material such as rubber or synthetic resin attached to the outside of the split members, At the front end of the split member, a biting portion that fits into the valley of the bellows tube projects inward and the flange is integrally provided with the auxiliary cylinder, and the retainer housing chamber in the joint body is provided. Behind the retainer, there is provided a retainer expansion allowance recess that allows the front end of the retainer to expand, and the bite portion of the retainer is the retainer expansion allowance recess positioned in the temporary fixing position. To respond to Flexible pipe joint which is characterized in that it is a constant.