JPH07251228A - Method and device for connecting projecting and recessing tube - Google Patents

Abstract

PURPOSE:To provide a connecting device by which a projected and recessed tube satisfactorily becoming a sheeth tube in a header system sheath tube manufacturing method, etc., can be connected. CONSTITUTION:The device is equipped with a collet type pressing device consisting of collet parts 12 formed by plural pieces and plural projected and recessed strip parts 13 formed at the tip parts of these collet parts, a calking jig 10 composed by rod base part 21 and tapered rod 2 consisting of a tapered lever 22 to be inserted into the inside of the collet part, and a connecting fitting 20 with a rotable screw-in fitting 5 at a head part and by which a projected and recessed tube 6 and the tip part of an opening part are put on the outer peripheral part of a cylindrical fitting 4. The projected and recessed strip part 13 at the tip part of the collet part 12 of the calking jig 10, is allowed to position in the inner peripheral part of the cylindrical fitting 4 of the connecting fitting 20. The tapered rod 2 is allowed to move, the collet part 12 is allowed to expand, and the projected and recessed tube 6 is connected to the connecting fitting 20 by an inward calking force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for connecting a concavo-convex pipe for connecting a concavo-convex pipe, which serves as a sheath pipe in a pipe construction method for supplying hot water and water.

[0002]

2. Description of the Related Art In recent years, a header type sheath pipe construction method has been used to lay hot water supply and water supply pipes for houses. In this construction method, a sheath pipe serving as a guide pipe is laid in advance, and a flexible pipe for hot water supply and water supply is inserted into the sheath pipe for piping. Here, an uneven tube made of hard synthetic resin is used as the sheath tube.

FIG. 10 shows a schematic view of constructing a water supply pipe for a flush toilet by this header type sheathing method. In this figure, the concavo-convex tube 6 serving as a sheath tube is inserted from the lower opening portion 85 of the connection box 83 fixed to the back surface of the wall surface 82, and is supported by the lower opening portion 85 by the two pins 84. Wall surface 82 facing the connection box 83
A faucet 81 for water supply is attached to the front part of the. When the sheath pipe is laid in advance in this way, the flexible pipe 86 is inserted into the sheath pipe and the flexible pipe 86 is connected to the connection port 81a of the faucet, whereby the water supply pipe can be constructed.

[0004]

However, in the conventional construction method as described above, the lower opening 8 of the connection box 83 is formed.
Since a gap is formed in 5, the sound of the water supply flowing in the flexible pipe 86 leaks to the outside or the connection box 83
If the pipe is damaged inside, there is a problem of leaking water to the outside. Further, in the hot water supply pipe, if there is a gap in the lower opening portion 85 of the connection box 83, there is a problem that the heat retaining property becomes poor.

The present invention has been proposed in order to solve the problems of the prior art, and a connecting method and device for connecting a concavo-convex tube which is a good sheath in a header type sheath method. The purpose is to provide.

[0006]

In order to achieve this object, a method for connecting a concavo-convex tube according to the present invention is provided with a cylindrical metal fitting of a connecting metal fitting having a rotatable screw fitting on the head.
Insert the end of the opening of the uneven tube, and expand the tubular fitting and the end of the opening of the uneven tube into an uneven shape integrally from the inner peripheral side of the tubular fitting by the internal caulking force to form the uneven tube. This is the method of connecting to the connection fittings.

Further, the connection method of the uneven tube according to the present invention is
A tubular sealing material is fitted into the inner peripheral part of the opening end of the uneven tube, and the opening end of this uneven tube is sealed on the outer peripheral part of the tubular fitting of the connecting fitting that has a rotatable screw fitting on the head. Insert through the material, and connect the concavo-convex tube by expanding the cylindrical metal fitting, the sealing material and the opening end of the concavo-convex tube integrally into the concavo-convex shape from the inner peripheral side of the cylindrical clasp by internal caulking force. It is a method of connecting to metal fittings.

Further, the connection method of the uneven tube according to the present invention is
When the end portion of the opening of the concavo-convex tube is crimped from the inner peripheral side of the tubular fitting by the internal crimping force, the inner peripheral portion of the tubular fitting has the same diameter as the inner diameter of the concavo-convex tube.

Further, the connection device for the uneven tube according to the present invention is
A collet-shaped die pressing tool composed of a plurality of collet portions and a plurality of concave-convex strip portions formed at the tip of the collet portion,
A caulking jig composed of a rod rod and a taper rod formed of a taper rod inserted into the collet portion, a rotatable screw fitting on the head, and an opening end portion of the concavo-convex tube on the outer peripheral portion of the tubular fitting. Equipped with a connection fitting
The concavo-convex strip portion of the tip of the collet portion of the caulking jig is located at the inner peripheral portion of the tubular strip metal fitting of the connecting metal fitting, the taper rod is moved to expand the collet portion, and the concavo-convex tube is formed by the internal caulking force. It is configured to connect to the connection fittings.

[0010]

According to the structure corresponding to the above-mentioned claim 1, the concave and convex pipe ends are connected to the outer peripheral portion of the tubular metal fitting of the connecting fitting by the internal caulking method. At this time, since the tubular fitting and the end portion of the uneven tube are integrally expanded in an uneven shape, the uneven tube cannot be removed from the connection fitting.

According to the structure corresponding to claim 2,
The concavo-convex tube end into which the sealing material is inserted is connected to the outer peripheral portion of the tubular metal fitting of the connecting fitting by the internal caulking method. At this time, since the tubular metal fitting, the sealing material, and the end portion of the uneven pipe are integrally expanded in an uneven shape, the uneven pipe is connected to the connection fitting with good airtightness.

According to the structure corresponding to claim 3,
When the opening end of the concavo-convex tube is crimped from the inner peripheral side of the tubular fitting by the internal caulking force, the inner peripheral part of the tubular fitting has the same diameter as the inner diameter of the concavo-convex tube. In the pipe construction method, a hose for supplying hot water and water and wiring for power distribution can be smoothly inserted into the uneven pipe that serves as a sheath pipe.

According to the structure corresponding to claim 4,
When the taper rod is moved, the concavo-convex section of the collet part expands, and the conical tube fitting of the connection fitting and the concavo-convex tube end fitted in this fitting are expanded into a concavo-convex shape. Is firmly connected to the connection fitting.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the method and apparatus for connecting uneven pipes according to the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a cross-sectional view of the caulking jig 10, and FIG. 2 shows a cross-sectional view of the concavo-convex tube 6 fitted with a connecting fitting 20. Here, the caulking jig 10 and the connecting fitting 20 constitute the connecting device for the uneven tube according to the present invention. The caulking jig 10 includes a collet-shaped die pressing tool 1 and a taper rod 2. The collet-shaped die pressing tool 1 has a taper other than the base portion 11 formed as a plurality of collet portions 12, and the collet portion 1
A plurality of concavo-convex strips (or concavo-convex connecting strips) 13 are provided at the tip of 2. The taper rod 2 is composed of a rod base portion 21 and a taper rod 22. The connection fitting 20 that is crimped by the crimping jig 10 is composed of, for example, a female screw-in fitting 5 and a tubular fitting 4. The tubular metal fitting 4 is formed of a head 41, which is rotatably connected to the threaded metal fitting 5, a stopper 3 and a hollow tubular portion 42.

As the concavo-convex pipe 6 for connecting the connecting fitting 20, there is, for example, a corrugated pipe made of hard synthetic resin, a corrugated pipe reinforced by a spirally wound metal wire, or a suction pipe. The corrugated pipe is used as a sheath pipe through which a flexible pipe for supplying hot water is supplied in a header type sheath pipe construction method, or as a sheath pipe through which wiring is used in a distribution sheath pipe construction method.

Next, the concavo-convex tube 6 is manufactured by using the caulking jig 10.
A procedure for connecting the connection fitting 20 to the connector will be described with reference to FIGS. 3 and 4. First, the end portion of the opening of the concavo-convex tube 6 having the same inner diameter as the outer diameter of the hollow cylindrical portion 42 is fitted on the outer peripheral side of the hollow cylindrical portion 42 of the connection fitting 20. The insertion portion 42a of the hollow tubular portion 42 into which the end portion of the opening portion of the concavo-convex tube 6 is fitted has a smaller diameter than the side of the threaded fitting 5 side so that the hollow tubular portion 42 can be fitted easily, and the hollow tubular portion 42 can be fitted by caulking. When crimped, the inner diameter is the same as the inner diameter of the uneven tube 6. In this state,
As shown in (a), the caulking jig 10 is set so that the uneven strip portion 13 of the collet portion 12 of the embossing tool 1 is located on the inner peripheral portion of the hollow cylindrical portion 42. FIG.3 (b) shows sectional drawing of the collet part 12 before crimping. In this state, if the rod base portion 21 of the taper rod 2 is pushed in the direction of the arrow as shown in FIG. 4A, the collet portion 12 is expanded by the taper rod 22 in the radial direction as shown in FIG. An uneven line 43 is formed on the hollow cylindrical portion 42 by the uneven line portion 13. At this time, the inner caulking force of the collet portion 12 expands the opening end portion of the uneven tube 6 to form the uneven strip 61, and the uneven tube 6 is formed on the outer peripheral portion of the hollow cylindrical portion 42 of the connection fitting 20.
Are connected together. Since the uneven tube 6 hardly extends in the radial direction and the longitudinal direction, the uneven tube 6 is firmly and surely connected to the connection fitting 20 by this inner caulking connection method and is not pulled out.

5 (a) and 5 (b) show a procedure for connecting the connecting fitting 20 to the uneven tube 6 by using the caulking jig of another embodiment. In this embodiment, the collet portion 12 and the taper rod 22 in the above-described embodiment are formed so that the taper directions thereof are opposite to each other. When connecting the hollow cylindrical portion 42 to the concavo-convex tube 6, the taper rod 2 is moved in the arrow direction. Do as if pulling.

As a method of moving the taper rod 2 in the above-mentioned two embodiments, a hand press lever, a toggle, a cam, a screw, an air cylinder, a hydraulic cylinder or the like can be used. If a simple portable type hand press is used, it can be easily assembled at the work site, and the length of the uneven tube 6 can be freely selected.

With such a connecting method, the concavo-convex tube 6 can be easily connected to the hollow cylindrical portion 42 of the connecting fitting 20 as shown in FIG. 6 only by the internal caulking force.

Next, another embodiment shown in FIG. 7 will be described. In this embodiment, the concavo-convex tube 6 having concavo-convex grooves formed on the outer peripheral portion and the inner peripheral portion is used. A tubular seal material 7 is fitted into the inner peripheral portion of the opening end portion of the concave-convex tube 6, and the hollow tubular portion 42 of the connecting fitting 20 is inserted into the inner peripheral portion of the seal material 7 so that the inner caulking force is increased. Thus, the concavo-convex tube 6 is connected to the hollow cylindrical portion 42 of the connection fitting 20 with good airtightness via the sealing material 7.

As enlargedly shown in FIGS. 6 and 7, when the end portion of the opening of the concavo-convex tube 6 is caulked from the inner peripheral side of the hollow cylindrical portion 42 by the internal caulking force, the hollow cylindrical portion 42 is Since the inner peripheral portion of the concave-convex tube 6 has the same diameter as the inner diameter of the concave-convex tube 6, it can be smoothly inserted into the concave-convex tube 6 when inserting a flexible pipe or a wiring wire.

Next, still another embodiment shown in FIG. 8 will be described. In this embodiment, a concavo-convex tube 6 which is a wave tube reinforced by winding a metal wire in a spiral shape on the outer peripheral portion is used. The hollow cylindrical portion 42 of the connecting fitting 20 is inserted into the inner peripheral portion of the open end of the uneven tube 6 so that the uneven tube 6 is firmly connected to the connecting fitting 20 by the internal caulking force. It should be noted that the concavo-convex tube 6 can also be applied to the inner peripheral portion in which a metal wire is spirally wound and reinforced.

Since the fitting 20 is attached to the concavo-convex tube 6 as described above, when the concavo-convex tube 6 is connected to the lower opening of the connection box 83 in the header type sheath construction method as shown in FIG. Male screw part 8 formed on the part
7 can be easily connected by tightening the screw-in metal fitting 5 of the connecting metal fitting 20.

The present invention is not limited to the female fitting of the connecting fitting 20 and the male fitting of the fitting 5 is also applicable.

[0025]

As described above, according to the present invention, when the inner caulking pipe fitting is attached to the pipe, the hollow cylindrical portion of the pipe fitting is annealed and mounted in the pipe, and the embossing of the caulking jig is performed. The tubular body is expanded and attached to the pipe by means of a tool. At this time, the annealed and softened tubular body is work-hardened by the expanding process and recovers and maintains the material properties before annealing.

The inner caulking pipe fitting is not particularly limited to the embodiment. For example, if classified by the pipe shape,
It can be applied to a cylindrical pipe, a reinforcing strip provided with inner and / or outer irregularities, or a pipe with a linear strip, functionally, a suction pipe and the like. In addition, the embossing strip shape of the embossing tool of the caulking jig can be arbitrarily selected from the embossing strips or the striped strips corresponding to the above-described pipes. Moreover, the rotary fitting pivotally attached to the hose fitting is not particularly limited to the pivotal structure when the connecting fitting connected thereto is rotatable.

When used as a pod for water supply, since the header side and the box side are hermetically attached, the flow of air between the water supply pipe and the pod is cut off. The water supply effect can be enhanced by the silencing of vibration noise caused by the pulsation of the pipe and the heat insulation function of the air layer. Moreover, it is possible to prevent the water from leaking to the outside of the pipe due to breakage of the water supply pipe.

When used as a wire sheath or pipe for an electric wire or the like, it can be laid between an industrial machine and a switchboard so that the electric wire can be easily installed thereafter. Especially, since the inner diameter of the inner peripheral part of the tubular metal fitting of the pipe fitting is formed to be equal to or larger than the inner diameter of the pipe after the inner crimping, as a fluid pipe, a smooth flow for the fluid, Has characteristics such as reduction of the insertion diameter of the main body and easy handling.

Further, according to the present invention, in the header type sheathing method, a caulking jig by an internal caulking method is used for connecting the uneven pipe to be the sheath pipe to the lower opening of the connection box of the faucet for supplying hot water. Since the connection fitting is attached to the end of the uneven pipe, the screw fitting of this connection fitting can be easily connected by screwing it into the threaded portion of the lower opening of the connection box.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a caulking jig that constitutes a connecting device according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which a connection fitting is fitted into a concavo-convex tube.

FIG. 3 (a) is a cross-sectional view before caulking when the connecting fitting is attached to the concavo-convex pipe using the caulking jig,
(B) is a cross-sectional view of the collet portion.

4 is a cross-sectional view of the state shown in FIG. 3 after being crimped using a crimping jig, and FIG. 4B is a transverse sectional view of the collet portion.

FIG. 5A is a cross-sectional view before caulking for mounting on a concavo-convex pipe of a connecting fitting using a caulking jig of another embodiment, and FIG. 5B is a cross-sectional view after caulking.

FIG. 6 is a cross-sectional view showing a state in which a connection fitting is attached to the uneven tube according to the present invention.

FIG. 7 is a cross-sectional view showing another embodiment in which a connection fitting is attached to a concavo-convex tube via a sealing material.

FIG. 8 is a cross-sectional view showing another embodiment in which a connection fitting is attached to a concavo-convex tube reinforced by winding a metal wire in a spiral shape.

FIG. 9 is a cross-sectional view showing a state in which a concavo-convex pipe having a connection fitting attached thereto is connected to a lower opening portion of a faucet connection box, and a flexible pipe is piped.

FIG. 10 is a cross-sectional view showing a conventional method of supporting a concavo-convex tube on a connection box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Collet-shaped die pressing tool 2 Tapered rod 3 Stopper 4 Cylindrical metal fitting 5 Screw-in metal fitting 6 Concavo-convex tube 7 Sealing material 10 Caulking jig 11 Base 12 Collet part 13 Concavo-convex ridge 20 Connection metal fitting 21 Rod base 22 Tapered rod 41 Head 42 Hollow cylinder Part 43 Uneven line 44 End 61 Uneven line 81 Faucet 82 Wall surface 83 Connection box 87 Male screw part

Claims (4)

[Claims] 1. The inner peripheral portion of the tubular fitting has the same diameter as the inner diameter of the uneven pipe when the end portion of the opening of the uneven pipe is crimped from the inner peripheral side of the tubular fitting by an internal caulking force. A method for connecting uneven pipes, characterized by. 2. A collet-shaped die pressing tool comprising a plurality of collet portions and a plurality of concavo-convex ridge portions formed at the tip of the collet portion, a rod portion and a taper rod inserted into the collet portion. The caulking jig composed of a taper rod, the head having a rotatable screw fitting, and the connecting fitting into which the end of the opening of the concavo-convex tube is fitted on the outer circumference of the tubular fitting are provided. The concavo-convex ridge part at the tip of the part is positioned on the inner peripheral part of the tubular metal fitting of the above-mentioned connecting fitting, the taper rod is moved to expand the collet portion, and the concavo-convex tube is connected to the connecting fitting by the internal caulking force. A concavo-convex pipe connecting device characterized in that 3. An end portion of an opening of a concavo-convex tube is fitted into an outer peripheral portion of a tubular metal fitting of a connecting metal fitting having a screwed metal fitting on a head thereof, and an inner caulking force is applied to the tubular metal fitting from an inner peripheral side of the tubular metal fitting. A method for connecting a concavo-convex tube, characterized in that the concavo-convex tube is connected to a connection fitting by expanding the opening end of the concavo-convex tube integrally into a concavo-convex shape. 4. An opening of the concavo-convex tube in the outer peripheral portion of a tubular metal fitting of a connecting metal fitting having a screw-fitting metal fitting in the head and having a cylindrical seal member fitted in the inner peripheral portion of the opening end of the concavo-convex piping. Insert the end of the tubular member through the sealing material, and expand the tubular metallic member, the sealing material, and the opening end of the concave-convex tube integrally with the inner peripheral portion of the cylindrical metallic member by the internal caulking force to form an uneven shape. A method for connecting a concavo-convex tube, characterized in that the concavo-convex tube is connected to a connection fitting.