JPH0731034Y2 - Flexible tube fittings - Google Patents

Description

[Detailed Description of the Invention] [Field of Use and Outline of the Invention] The present invention relates to a joint for connecting a connected main body such as a gas cock to a pipe terminal made of a flexible pipe, and particularly for tightening the joint. By adopting the engagement mechanism in the tubular body, the connection work between the joint and the end of the flexible tube is simplified.

[Prior Art and Problems Thereof] In kitchens and the like, a gas cock is often attached to a wall surface. Recently, a large number of gypsum boards have been used to simplify the structure of the wall surface.

It is difficult to adopt a conventional steel pipe for such a wall surface, and recently, a bellows pipe, that is, a bendable flexible pipe is adopted as a gas pipe. This flexible tube expands the tube wall at regular intervals to make the axial section of the tube wall corrugated,
The outer diameters of the peaks (2a) (2a) are set to be constant. In this case, since the flexible tube itself has no rigidity,
The gas cock is fixed to the gypsum board and the flexible tube is connected to it.

As such a configuration, specifically, a configuration as shown in FIG. 9 is known.

As shown in the same figure, this conventional one is attached to the back surface of the wall plate (30) and the flange (12) which is extended from the gas inlet (11) of the gas cock body as the main body (1) to be connected. The gas cock body is fixed to the wall board (30) by screwing the backing plate (40) with the bolts (5) (5), and the flexible tube (2) is fixed to the gas cock body via the joint (20). Are connected.

The joint (20) includes a tubular main body (22) and a nut (2).
3), consisting of a pair of retainers (S) (S) and elastic packing (P), wherein the cross section of the retainer (S) (S) in the axial direction is the cross section of the pipe wall of the flexible tube (2) in the axial direction. And the retainer (S) (S) is externally fitted to the flexible tube (2) so as to face each other, and these are fitted to the tubular portion (25) of the main body portion (22).
It is used by inserting it together with the packing (P).

In this conventional type, the peripheral edge of the opening (30a) of the wall plate (30) covers a wide range over the flange (12) and the backing plate (4).
The gas cock body is securely fixed to the wall plate (30) because it is sandwiched by (0), and further, by the joint (20),
The gas cock body in the fixed state and the flexible tube (2) are connected. However, this conventional device has a problem that the connection between the flexible tube (2) and the joint (20) is troublesome.

That is, in the above-mentioned conventional one, when the joint (20) is attached to the flexible tube (2), the retainer (S) (S) and the packing (P) are set in advance and the main body portion (22) and the nut are attached. This is because (23) must be screwed together. In the work of mounting the gas cock, in which the flexible tube (2) is pulled out from the wall plate (30), the work is particularly troublesome, and the retainer (S) (S) is placed inside the wall plate (30). If it is lost, the joint (20) cannot be connected.

[Technical problem] The present invention is directed to such a "mountain portion (2a) formed on the pipe wall".
(2a) is a joint for a flexible tube (2), in which the ends of the flexible tube (2) which are uniformly continuous in the axial direction are connected to the tubular portion (25), the connection of the flexible tube (2) In order to improve the workability of the flexible tube (2), the end of the flexible tube (2) is directly inserted into the flexible tube connecting portion so that the flexible tube (2) can be connected to the tubular portion in a retaining state. This is a technical issue.

[Technical Means] The technical means of the present invention taken to solve the above technical problem is "a female screw portion (21) is formed over a certain range from the open end of the tubular portion (25), An intermediate diameter portion (24) having a diameter smaller than that of the female screw portion (21) and a small diameter portion (26) following the intermediate diameter portion (21) are provided in the inner portion, and a flow having a diameter smaller than that of the flexible tube (2) is provided in the inner portion of the small diameter portion (26). A taper portion (27) provided with a passage hole portion (28) and having a diameter reduced in the depth direction between the intermediate diameter portion (24) and the small diameter portion (26).
And a cylindrical screw (4) having a through hole (41) through which the flexible tube (2) is loosely fitted and penetrated, is screwed into the female screw portion (21),
The tip of the cylindrical screw (4) is formed as a taper portion (42) that expands in the depth direction, and the taper portion (42) and the taper portion (27) are provided.
A split ring (3) made of a wire having a circular cross section is interposed between the split ring (3) and the inner ring of the split ring (3) so that the split tube (3) can be fitted onto the flexible tube (2) exactly, and the tubular screw (4) is placed at the final position. The position of the tapered portion (27) is set so that the split ring (3) is screwed into the annular trough between the crests (2a) and (2a) of the flexible tube (2). The pair of split rings (3) and (3) are interposed between the tapered portion (27) and the tapered portion (42), and the auxiliary ring (31) is interposed between the split rings (3) and (3). Then, the cross-sectional shape of the auxiliary ring (31) has an inverted trapezoidal shape in which the width on the inner peripheral side is smaller than that on the outer peripheral side. "

[Operation] The technical means of the present invention operates as follows.

When the flexible tube (2) is not connected to the tubular portion (25), the split ring (3) (3), the auxiliary ring (31) and the tubular screw (4) are housed in the tubular portion (25). And the cylindrical screw (4) is not screwed in. Therefore, the split rings (3) and (3) are in a free state, and the inner diameter thereof is large enough to fit the flexible tube (2) therein.

When connecting the flexible tube (2), after inserting the end of the flexible tube (2) through the through hole (41), the cylindrical screw (4) is screwed into the final position.

When the flexible tube (2) is inserted all the way, since the diameter of the flow path hole (28) is smaller than that of the flexible tube (2), the tip of the flow path hole (28) is in the formation part of the flow path hole (28). Touch the end face. Since the disposition position of the taper part (27) is set to a predetermined position in advance, at this time, it is located in the outer peripheral area between the peak parts (2a) (2a) of the inserted flexible tube (2). However, it is interposed between the tapered portion (27) and the tapered portion (42).

If the tube screw (4) is screwed in from this state, the split ring (3)
The split ring (3) and the auxiliary ring (31) are pushed and sandwiched between the opposing tapered surfaces, and the diameters of the split rings (3) and (3) are reduced by the wedge action.
(3) will be pressed into the annular valley between the peaks (2a) and (2a).

At this time, the outer peripheral side of the split rings (3) and (3) is sandwiched by the taper portion (27) and the taper portion (42), and the inner peripheral side is engaged with the small diameter portion (26) so that the flexible tube (2). Is held in the retaining state and the connection is completed.

To remove the flexible tube (2) from this state, use the tube screw (4)
Loosen to make the split rings (3) and (3) free. When the split ring (3) is made of an elastic material, the inner diameter becomes larger than the outer shape of the flexible tube (2) in this state, so that the flexible tube (2) and the split ring (3) are engaged with each other. The flexible tube (2) is pulled out and pulled out. When the split ring (3) is made of an inelastic material, the flexible tube (2) is forcibly pulled out with the tubular screw (4) loosened. Since there is no member for preventing the expansion of the split ring (3) in the outer peripheral region, the flexible tube (2) can be pulled out while the diameter of the split ring (3) is increased.

[Effects] The present invention having the above-described configuration has the following unique effects.

Since the flexible tube (2) and the tubular portion (25) are connected to each other only by inserting the flexible tube (2) into the through hole (41) and screwing the tubular screw (4), Connection work of the flexible tube (2) is simplified.

Further, since the split ring (3) having the same function as the retainer (S) of the conventional example is held in the tubular portion (25), there is no inconvenience of losing them.

Since the flexible tube (2) is engaged and held by the two split rings (3) and (3), the engaging and holding strength of the flexible tube (2) is large.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

◎ First Example A first example shown in FIGS. 1 to 4 is similar to the conventional example.
The present invention is applied to the gas inlet portion (11) of the gas cock body, and as shown in FIGS. 1 and 4, this gas inlet portion (11) becomes the flow passage hole portion (28) as it is.

The small diameter portion (26), the intermediate diameter portion (24), and the female screw portion (21) are arranged in the above order in the upstream side of the gas inlet portion (11) toward the open end side of the tubular portion (25). Two split rings (3) and (3) are provided between the tapered portion (27) and the tapered portion (42) of the cylindrical screw (4).

In order to enable these two split rings (3) (3) to be simultaneously tightened to the flexible tube (2) side, in this embodiment, an auxiliary ring (31) is provided between the split rings (3) (3). Intervenes. The cross section of the auxiliary ring (31) is an inverted trapezoidal cross section in which the width in the axial direction on the inner peripheral side is smaller than that on the outer peripheral side, and both ends are tapered portions.

Further, the small-diameter portion (26) following the tapered portion (27) is tapered in the same direction as the tapered portion (27) and is gentler than this, and the outer periphery of the small-diameter portion (26) is small. Metal packing (3 with tapered surface and parallel hole on the inner peripheral side)
2) is fitted therein, and the inner diameter of the metal packing (32) is set to a size that allows it to be fitted onto the flexible tube (2).

An enlarged space (29) is formed in the inner part of the small diameter portion (26), and a cylindrical elastic packing (P) into which the flexible tube (2) is tightly fitted is formed in the enlarged space (29). ) Is accommodated, and a flow path hole (28) is opened in the bottom wall of the packing accommodating portion.

In the first embodiment, the split rings (3) and (3) are made of an elastic material such as spring steel, and when the tubular screw (4) is loosened, as shown in FIG. 3) The content of (3) is slightly larger than the outer shape of the flexible tube (2). Also, the metal packing (32) fitted in the small diameter portion (26).
The inner diameter of is also slightly larger.

Therefore, when the flexible tube (2) is inserted up to the position where its tip end is in contact with the bottom wall of the enlarged space (29), the vicinity of the tip end is pressed into the elastic packing (P). Then, when the tubular screw (4) is screwed in in this state, the flexible tube (2) is retained in the tubular portion (25) in the retaining state by the action as described above.

The split ring (3) with the cylinder screw (4) loosened
The position of (3) and the position of the auxiliary ring (31),
The position of the end surface of the metal packing (32) on the side of the tapered portion (27) is set to a predetermined position, and the split ring (3) in contact with one tapered portion (42) is a mountain of the flexible tube (2). The split ring (3) located on the outer peripheral side of the top of the part (2a) and facing the other tapered part (27) is located in the outer peripheral region of the valley between the peaks (2a) and (2a).

If the tube screw (4) is screwed in from this state, the split ring (3)
The split ring (3) and the auxiliary ring (31) are pushed in and sandwiched between the opposing tapered surfaces, and the diameters of the split rings (3) and (3) are reduced by the wedge action. In particular, taper part (4
As for the split ring (3) that is in contact with 2), the diameter of the split ring (3) shrinks while moving inward in the axial direction. The split ring (3) that is in contact with the tapered portion (27) is in contact with the end surface of the metal packing (32) during the diameter reduction, and this causes the metal packing (32) to be pushed in the axial direction, The diameter of the metal packing (32) is reduced by the taper fitting action with the small diameter portion (26) which is a tapered surface, as shown in FIG.

In this embodiment, the flexible tube (2) has two split rings (3).
The flexible tube (2) is engaged and held by (3) and the outer circumference of the flexible tube (2) is metal-sealed by reducing the diameter of the metal packing (32). Further, the distal end side of the flexible tube (2) is also kept airtight on the outer periphery by the elastic packing (P).

◎ Second Embodiment In a second embodiment shown in FIGS. 5 and 6, a metal packing (32) is interposed between a pair of auxiliary rings (31) (31),
The auxiliary ring (31) by screwing the tube screw (4)
The diameter of the metal packing (32) is reduced by the opposing approach of (31).

For this reason, the metal packing (32) interposed between the pair of auxiliary rings (31) (31) has an inverted trapezoidal cross-sectional shape, and the pair of auxiliary rings (31) (31) has a pair of auxiliary rings (31) (31). The combination of the auxiliary rings (31) and (31) and the metal packing (32) functions as the auxiliary ring (31) in the first embodiment.

In this case, the state where the cylinder screw (4) is loosened is as shown in FIG. 6, and when the cylinder screw (4) is screwed in,
As a result, the split rings (3) and (3) are slightly moved in the axial direction, and the split rings (3) and (3) are pressed into the troughs of the flexible tube (2). Finally, the state shown in FIG. 5 is reached, and the metal packing (32) is contracted by the mutual proximity of the auxiliary rings (31) and (31), and the inner peripheral surface is pressed against the top of (2a). It will be.

In addition, the metal packing (32) by screwing the cylinder screw (4)
In order to increase the diameter reduction force, the taper at both ends of the metal packing (32) may be set loosely. Therefore,
In this case, the tapered surfaces of the auxiliary rings (31) and (31) that are in contact with the metal packing (32) also have the same taper.

◎ Others In any of the above embodiments, the split ring (3) (3) is just a flexible tube (2) with the tubular screw (4) screwed into the final position.
The position of the taper part (27) was set so that it would be press-fitted into the valley part of the, but this was set as shown in Fig. 7, and when the cylinder screw (4) was loosened, the split ring (3) (3) is made to substantially coincide with the center of the trough, and the diameter of the split rings (3) and (3) is reduced by screwing the cylindrical screw (4), and the split ring (3) and (3) are moved as shown in FIG. This allows
The flexible tube (2) may be held in a retaining state. In this case, a force pushing in the axial direction acts on the flexible tube (2), and the tip of the flexible tube (2) is pressed against the bottom wall of the enlarged space (29). Become.

In any of the above-mentioned embodiments, the flexible tube (2) including the coating tube (H) is used, and the portion of the coating tube to be inserted into the tubular portion (25) is peeled off and used. The end portion of the covering tube (H) is fitted in an airtight state in an annular packing (49) provided in the through hole (41) of the cylindrical screw (4). This can prevent water from entering the inside.

[Brief description of drawings]

FIG. 1 is a sectional view showing a connection state of the first embodiment of the present invention, and FIG.
FIG. 4 is an enlarged view of the main part, FIG. 3 is an explanatory view during connection of a flexible tube, FIG. 4 is an exploded view of this embodiment, FIGS. 5 and 6 are sectional views of the second embodiment, and FIG. FIGS. 8 and 9 are cross-sectional views of another embodiment, and FIG. 9 is an explanatory view of a conventional example. In the drawings, (2a) ... mountain portion, (26) ... small diameter portion (2) ... flexible tube, (28) ... Flow path hole part (25) ... Cylindrical part, (27) ... Tapered part (21) ... Female screw part, (41) ... Through hole (24) ... Intermediate diameter part, (42) ... Tapered part ( 31)… Auxiliary ring

Claims (1)

[Scope of utility model registration request] 1. An end of a flexible tube (2), in which crests (2a) (2a) formed on a tube wall are continuous at a constant interval in the axial direction, is connected to a tube section (25). In flexible pipe joints,
From the open end of the tubular part (25), the female screw part (2
1) is formed, an intermediate diameter portion (24) having a diameter smaller than that of the female screw portion (21) and a small diameter portion (26) subsequent to the intermediate diameter portion (21) are provided, and a flexible tube is provided inside the small diameter portion (26). (2) A passage hole portion (28) having a smaller diameter is provided, and a taper portion (27) is formed between the intermediate diameter portion (24) and the small diameter portion (26) to reduce the diameter in the depth direction. A taper for screwing a cylindrical screw (4) having a through hole (41) through which the flexible tube (2) is loosely fitted and penetrated into the portion (21), and enlarging the tip of the cylindrical screw (4) in the depth direction. The split ring (3) made of a wire having a circular cross section is interposed between the tapered portion (42) and the tapered portion (27), and the inner diameter of the split ring (3) is set to a flexible tube. The split ring (3) is sized so that it can be fitted over (2), and the cylindrical screw (4) is screwed into the final position.
The position of the tapered portion (27) is set so that the tapered portion (27) is press-fitted into the annular valley portion between a), and the pair of split rings (3) ( 3) is interposed and an auxiliary ring (31) is interposed between the split rings (3) and (3), and the width of the auxiliary ring (31) on the inner peripheral side is smaller than that on the outer peripheral side. An inverted trapezoidal joint for flexible tubes.