JP2528584B2 - How to attach fittings to the hose - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of attaching a fitting to a jacket type hose used for fire fighting.

[0002]

2. Description of the Related Art In general fire hoses, a lining layer of rubber or synthetic resin is applied to the inside of a jacket in which a warp yarn made of fibers and a weft yarn made of fibers are woven in a tubular shape.
If necessary, the outer surface of the hose is coated with rubber or synthetic resin.

To attach a fitting to the end of this jacket type hose, a short pipe is fitted to the outer circumference of the hose, and the fitting is fitted to the inner circumference of the tip of the hose. By pressurizing, the short pipe is fastened to the fitting.

That is, the inscribed surface of the crimping piece with the short pipe is formed into a curved surface having a curvature smaller than the curvature of the short pipe when the crimping is finished, and at the beginning of crimping, only both ends of the crimping piece are short pipes. It comes into contact with the outer peripheral surface.

The method of attaching the joint fitting to this hose is described in JP-B-52-17886 and JP-A-54-11.
2012, JP-A-59-57674, JP-A-60-38986, and JP-A-1-92589.
No. 1993, which is hereby incorporated by reference.

According to Japanese Patent Publication No. 52-17886, a slack portion produced by tightening a short pipe is pushed (a gap between a crimping piece and a crimping piece at the end of crimping), a horizontal formwork and an upper and lower formwork. It is designed to be escaped to the recessed groove provided in the. Therefore, a convex portion (hereinafter referred to as a vertical streak) is formed on the outer periphery of the short pipe, and a force (hereinafter referred to as a grip force) against the hose axially coming off from the fitting is It has sufficient strength.

However, variations in the force (hereinafter referred to as the sealing force) against the water leakage between the joint fitting and the hose are recognized, and in the resin-lined hose having a thin hose lining layer, Water leakage may occur. It was found that the cause of this water leak was "Tateshin". In other words, it was found that the "vertical streak" changes depending on the wall thickness, inner diameter, etc. of the hose to be attached, and when the "horizontal streak" greatly occurs, it is generated by leaking through the "vertical streak". .

FIG. 5 is a cross-sectional view when a short pipe is crimped by a conventional crimping device, where a is a joint fitting and b is a fitting.
Is a hose and c is a short pipe. On the outer circumference of the short tube c, four vertical streaks d ... In addition, a vertical pipe d allows a short tube c such as an aluminum ring
There are vertical cracks on the inside, and rust easily occurs. When this crack is large, the short pipe c may crack and the hose b may come off from the joint fitting a.

Further, Japanese Patent Laid-Open No. 54-122012,
Japanese Unexamined Patent Publication No. 59-57674 discloses a method of forming "vertical stripes" in the axial direction on the outer circumference of a short pipe and at the same time forming a dent line on the peripheral wall of the short pipe for tightening by a lateral ridge.
This is to improve the grip force, and no consideration has been given to the sealing force. In other words, there is a "vertical streak" that causes water leakage, and if there is a lateral ridge, it becomes impossible to absorb the slack of the short pipe as a contraction in the circumferential direction.

Further, Japanese Utility Model Publication No. 60-38986 discloses that
A large number of long holes along the longitudinal direction are drilled on the outer circumference of the short pipe in alternate positions in the front and rear in the longitudinal direction, which prevents the occurrence of "vertical streaks" and improves the sealing force. It is intended. However, drilling a large number of long holes greatly increases the cost.

Further, Japanese Utility Model Laid-Open No. 1-92589 discloses that
The gripping force is improved by the annular crimping at regular intervals, but no consideration is given to the improvement of the sealing force.

[0012]

As described above, in the conventional method of attaching the joint fitting to the hose, the "vertical streak" is generated particularly sharply inside the short pipe such as the aluminum ring,
There are often vertical cracks. There is a risk that water leakage will occur along this “vertical streak” and that if this crack is large, the short pipe will break and the hose will come off from the fitting.

Further, according to the variation of the outer diameter of each hose to be crimped, several kinds of short pipes are prepared every 1 mm, and the crimping amount of the short pipe is selected by selecting each time according to the hose. However, it is uneconomical to prepare a large number of short pipes having different diameters, and the management of parts is complicated, which is not suitable for practical use.

Specifically, in the case of a fire hose, the working pressure is 20, 16.13, 9,7 kg / cm ^2. There are five types, and the hose wall thickness is different, so the outer diameter of the hose will also be different. Further, there are rubber and synthetic resin as the material of the lining layer, which have different diameters, and there are many types. In addition, the inner diameter of the hose is 3 mm at the maximum and the minimum in the standard, and naturally the outer diameter of the hose also changes. Therefore, in order to reduce the crimping amount of the short pipe, the inner diameter is also 1 m.
It is difficult to manufacture because it must be manufactured with a narrow dimensional tolerance of about m.

The present invention has been made in view of the above circumstances, and the purpose thereof is to be able to swage into a substantially perfect cylindrical shape without generation of vertical lines, burrs, unevenness, etc. An object of the present invention is to provide a method for attaching a joint fitting to a hose that can improve the force and grip.

[0016]

In order to achieve the above-mentioned object, the present invention provides a lining layer of rubber or synthetic resin on the inside of a jacket in which a warp yarn made of fibers and a weft yarn made of fibers are woven in a tubular shape. The short tube is fitted to the outer circumference of the hose, and the fitting is fitted to the inner circumference of the end of the hose.The short tube is evenly pressed by the caulking piece that approximates the outer diameter of the short tube. In the method of attaching a fitting to a hose for fastening a pipe to a fitting, the wall thickness of the short pipe before tightening is 1 / outer diameter of the outer diameter of the short pipe before tightening.
Is 15 or less, the material of the short pipe is aluminum alloy or a copper alloy, as well as equally arranged six or more pressurized Shimekoma circumferentially outer circumference of the short pipe, and the crimping piece and the crimping piece Between the short pipes is 0 or less than twice the wall thickness of the short pipe before tightening, and these crimping pieces are simultaneously moved in the center direction of the short pipe by the same amount to push the short pipe, thereby joining the short pipe. It is characterized by being fastened to a metal fitting. Further, the inscribed surface of each crimping piece with the short pipe is the same as the curvature of the short pipe at the end of the crimping or a curved surface not less than the curvature after crimping but not more than the curvature before crimping. To do.

[0017]

[Operation] With the short pipe fitted to the outer circumference at the end of the hose and the fitting fitting fitted to the inner circumference of the end of the hose,
The end of this hose is set in a crimping section surrounded by 6 or more crimping pieces. When each caulking piece is moved toward the center of the caulking portion in this state, each caulking piece moves forward toward the center of the caulking portion while being kept at a constant interval, so that the caulking piece is set on the caulking portion. The short pipe fitted to the end of the hose is evenly pressed by the crimping piece and fastened to the joint fitting.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show a caulking device, and FIG. 3 shows a jacket type hose. The jacket 12 of the hose 11 is formed by weaving a warp yarn made of fibers and a weft yarn made of fibers into a tubular shape.
A lining layer 13 made of rubber or synthetic resin is provided on the inside.

A short pipe 1 is provided on the outer periphery of the end of the hose 11.
4 is fitted, and a fitting 15 is fitted on the inner circumference of the end of the hose 11. A caulking piece that approximates the short pipe 14 to the outer diameter of the short pipe 14 by means described later is used. Even if the caulking device is provided, the short pipe 14 is pressed uniformly and the short pipe 14
It is supposed to be fastened to. The short tube 14 has a wall thickness of not more than 1/15 of the outer diameter of the short tube before fastening , and the material of the short tube 14 is an aluminum alloy or a copper alloy.

Next, a caulking device for fastening the short pipe 14 to the joint fitting 15 and attaching the joint fitting 15 to the hose 11 will be described. In FIGS. 1 and 2, 21 is a lower mold and 22 is an upper mold. A pair of left and right horizontal dies 23, 24 is provided between the lower die 21 and the upper die 22.

The lower mold 21 and the upper mold 22 have basically the same shape, and are provided with crimping pieces 25a and 25b facing each other in the vertical direction. Further, on both sides of the lower mold 21 and the upper mold 22, an inclined sliding surface 2 having an inclination of 45 ° with respect to a horizontal plane.
1a and 22a are provided.

The horizontal molds 23, 24 are slidably interposed between the inclined sliding surfaces 21a, 22a, and the lower mold 2
The horizontal dies 23 and 24 are provided with crimping pieces 25c and 25d facing left and right, respectively.

Further, the lower mold 21 and the upper mold 22 are extended in the left-right direction from the center portions in the left-right direction and extend 2 in relation to the horizontal plane.
Slant sliding surfaces 21b and 22b having an inclination of 2.5 ° are provided.

Further, the upper and lower portions of the horizontal molds 23, 24 are provided with inclined sliding surfaces 23a, 24a having an inclination of 67.5 ° with respect to a horizontal plane extending in the vertical direction. Therefore, the lower mold 21 and the horizontal mold 2 are formed by the 22.5 ° inclined sliding faces 21b and 22b of the lower mold 21 and the upper mold 22 and the 67.5 ° inclined sliding faces 23a and 24a of the horizontal molds 23 and 24.
3, 24 and between the upper mold 22 and the horizontal molds 23, 24 at a wide angle V-shaped portion 26 having an angle of 135 °.
... are formed.

The wide-angle V-shaped portions 26 at the above-mentioned four places ...
Are provided with crimping pieces 25e to 25h facing each other along a diagonal line passing through the center O. Therefore, a total of eight caulking pieces 25a to 25h supported by the lower mold 21, the upper mold 22, and the horizontal dies 23 and 24 are arranged at equal intervals in the circumferential direction, and are arranged between the eight caulking pieces 25a to 25h. Have springs 27 interposed therebetween and are always kept at equal intervals.

The inscribed surfaces of these eight caulking pieces 25a to 25h with the short pipe 14 have the same curvature as that of the short pipe 14 when the caulking pieces 25a to 25h have finished caulking, or the curvature after caulking. As described above, the curved surface is formed to have a curvature equal to or less than that before the caulking.

The space between the eight caulking pieces 25a to 25h, that is, the slack that occurs when the short pipe 14 is tightened is easy to escape. The gap between the bridge and the bridge is set to be equal to or less than the wall thickness of the short pipe 14.

Further, spring pins 28a to 28h are provided on both side surfaces of the horizontal molds 23 and 24 and the six caulking pieces 25a, 25b and 25e to 25h. Side plates 29 and 30 are joined to both sides of the lower mold 21 and the upper mold 22, and are fixed to the lower mold 21 and the upper mold 22 by a plurality of bolts 31.

The side plates 29 and 30 of the lower mold 21 and the upper mold 22 have through holes 32a into which the spring pins 28c of the caulking pieces 25a are inserted, and caulking pieces 25e and 25h.
Long holes 32b into which the spring pins 28e and 28h of the above are slidably inserted, and the spring pins 2 of the horizontal molds 23 and 24.
An elongated hole 32c into which 8a and 28b are slidably inserted is provided. Next, the operation of the crimping device configured as described above will be described.

A short pipe 1 is provided on the outer periphery of the end of the hose 11.
4 is fitted and a fitting 15 is fitted on the inner circumference of the end of the hose 11. The end portion of the hose 11 is inserted into the crimping portion A surrounded by the crimping pieces 25a to 25h of the crimping device.

In this state, when the lower die 21 and the upper die 22 are vertically pressed by hydraulic pressure or the like, the lower die 21 and the upper die 22 are pressed.
The crimping pieces 25a, 25b move in the direction of the center O of the crimping portion A in accordance with the approach of the crimping section A, and the horizontal dies 23, 24 move by the inclined sliding surfaces 21a, 22a to form the crimping pieces 25c, 2c.
5d moves toward the center of the caulking portion A. Horizontal type 23, 24
As a result, the caulking pieces 25e to 25h also move in the direction of the center O of the caulking portion A by the inclined sliding surfaces 23a and 24a.

As described above, the eight caulking pieces 25a to 25h are moved forward in the direction of the center O of the caulking portion A while being kept at a constant interval by the springs 27 ... The short tube 14 fitted at the end of 11 is 8
The individual crimping pieces 25a to 25h uniformly apply pressure from eight directions and press-fit the joint fitting 15.

Therefore, the fitting 15 is firmly crimped to the end of the hose 11 and the short pipe 14 is uniformly pressed from eight directions by the eight caulking pieces 25a to 25h. The slack can be absorbed as a contraction in the circumferential direction, and as shown in FIG. 4, there is no protrusion in the axial direction of the short pipe 14, and the short pipe 14 is tightened into a substantially complete cylindrical shape without unevenness. Although the eight caulking pieces are arranged at equal intervals in the one embodiment, the present invention
The number is not limited to eight and may be an even number of six or more.

[0035]

As described above, according to the present invention, the wall thickness of the short pipe before tightening is 1/15 or less of the outer diameter thereof, and an even number of 6 or more is provided on the outer circumference of the short pipe. Of the crimping pieces are evenly arranged in the circumferential direction, and the pressing margin between the crimping pieces is 0 or less than twice the wall thickness of the short pipe before fastening. By simultaneously and uniformly crimping, the short pipe can be crimped into a substantially perfect cylindrical shape without vertical streaks, burrs, unevenness, etc.
There is an effect that the sealing force and the grip force can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a caulking device showing an embodiment of the present invention.

FIG. 2 is a side view of the crimping device according to the embodiment.

FIG. 3 is a half sectional view showing a state in which a short pipe and a fitting are fastened to a hose.

FIG. 4 is a cross-sectional view showing a state in which a short pipe and a fitting are fastened to a hose by the caulking device of the same embodiment.

FIG. 5 is a cross-sectional view of a state in which a short pipe and a joint metal fitting are fastened to a hose by a conventional caulking device.

[Explanation of symbols]

11 ... Hose, 14 ... Short pipe, 15 ... Joint fitting, 25a ...
25h ... Crimping piece.

Claims (2)

(57) [Claims] 1. A short pipe is fitted to the outer circumference of a hose having a rubber or synthetic resin lining layer inside a jacket made by weaving a warp yarn made of fibers and a weft yarn made of fibers in a tubular shape, In the fitting method of the fitting for the hose, which fits the fitting on the inner circumference and uniformly presses this short pipe with a crimping piece that approximates the outer diameter of the short pipe to fasten the short pipe to the fitting. Before fastening the short pipe, the wall thickness before fastening
The outer diameter of the short pipe is less than 1/15, and the material of the short pipe is aluminum alloy or copper alloy.
While Distribute pieces or more pressurized Shimekoma circumferentially, a press allowance between the caulking piece and the crimping piece and less than twice the short pipe wall thickness before 0 or fastening, these pressure A method of attaching a fitting to a hose, characterized in that the short pipe is fastened to the fitting by simultaneously moving the pressing pieces in the center direction of the short tube and pushing them. 2. The inscribed surface of each crimping piece with the short pipe is the same as the curvature of the short pipe when the crimping is finished, or is a curved surface which is equal to or more than the curvature after crimping and less than the curvature before crimping. The method for mounting a joint fitting to a hose according to claim 1, wherein.