JPH0424234Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a fire hose joint used for fire fighting, etc.

BACKGROUND OF THE INVENTION Conventionally, this type of joint has generally been formed as shown in FIG. In the figure, a is the main body of the cylindrical joint, b is the small diameter portion thereof, c is the large diameter portion, and d is the holding portion for the hose e, which has a nearly serrated cross section. This hose e is made of synthetic fiber, and has a rubber layer f formed as a liquid-tight layer on its inner surface. g is hose e
A space for accommodating the end packing h, i is an expand ring made of brass alloy. This expand ring i is expanded outward in the radial direction by a hydraulic expansion device (not shown), and the hose e is held in pressure contact between the ring i and the holding portion d.

Problems to be Solved by the Invention However, the conventional hose joint described above has the following problems. The reason is that after a long period of time, the rubber layer f of the hose e becomes gelatinous, and the hose e may come off from the main body a. The gelation of the rubber layer f occurs only in the portion that is in contact with the expand ring i.

Another problem is that the end gasket h may not be accommodated in the space g accurately at right angles to the axial direction. It is housed obliquely to the axis j, as shown in FIG. 5 in an exaggerated manner, and as a result, the effectiveness of the seal is weak and water may leak from this area.

This invention was made to solve such problems, and its purpose is that even after a long period of time, the rubber layer f of the hose e corresponding to the expand ring i gels, causing the hose to deteriorate. To provide a fire hose joint in which a hose (e) does not fall off from a main body (a). Another object of the present invention is to provide a fire hose joint in which the end gasket h is always housed in the space g in a state perpendicular to the axial direction, thereby eliminating the risk of water leakage. It is.

Means for Solving the Problems This invention for achieving the above object is described as follows: A holding portion 3 of a hose 2, which is formed on the inner surface of a cylindrical main body 1 and has a substantially serrated cross section;
In the main body 1, an accommodating part 5 for the end packing 4 formed at the base end of the holding part 3: a cylindrical expand ring 6 made of brass alloy and inserted into the main body 1; The expand ring 6 is provided endlessly on the outer peripheral surface of the expand ring 6.
This is a fire hose joint characterized in that it consists of a synthetic rubber packing 7 that elastically deforms and expands when it expands; and an end packing 4 housed in the housing section 5.

In addition, a holding portion 3 for the hose 2 having a substantially serrated cross section formed on the inner surface of the cylindrical main body 1;
A housing part 5 for the end packing 4 formed at the base end of the holding part 3; A cylindrical expand ring 6 made of brass alloy and housed in the main body 1; The expand ring A packing 7 made of synthetic rubber is provided to fit into the packing 6; a packing 7 made of synthetic rubber is formed integrally with the end of the packing 7 made of synthetic rubber, is fitted into the expand ring 6, and is housed in the housing portion 5; This is a fire hose joint characterized in that it consists of a bent end gasket 4.

Action: The hose 2 having the rubber layer 9 on the inner surface is brought into contact with the holding part 3 of the main body 1, the expanding ring 6 is inserted inside the hose 2, and the end gasket 4 is attached to the holding part 3 of the main body 1. The expand ring 6 is accommodated in the housing section 5, and in this state, the expand ring 6 is expanded radially outward by a hydraulic expansion device (not shown), and the hose 2 is inserted between the synthetic rubber packing 7 on the ring 6 and the holding section 3. are clamped together. In this case, the rubber layer 9 is provided inside the hose 2 as described in the conventional example, but the expand ring 6
A synthetic rubber packing 7 is provided on the outer surface of the rubber layer 9, and the synthetic rubber packing 7 elastically deforms and expands as the expand ring 6 expands, thereby blocking the gap between the rubber layer 9 and the expand ring 6. are doing.
In the conventional example, the rubber layer f on the inner surface of the hose 2 and the copper component in the expand ring i interacted with each other, resulting in a chemical change that caused the rubber layer f to gel. By interposing a synthetic rubber layer as the packing 7 between the rubber layer 9 and the brass layer forming the expand ring 6, it has been experimentally confirmed that gelation of the rubber layer 9 does not occur. . In this way, the problem of the hose e falling off mentioned in the prior art example was solved.

Furthermore, by forming the end gasket 4 accommodated in the housing portion 5 of the main body 1 integrally with the synthetic rubber gasket 7, the stability of the posture on the expand ring 6 is improved, and the axis is always maintained. The hose is fitted perpendicularly to the direction, thereby reliably preventing water from leaking from the end of the hose 2. Furthermore, since the end packing 4 is also made of synthetic rubber, it can be prevented from being chemically changed by the expanding ring 6 and becoming gelled, thereby reducing the packing effect.

Embodiment In FIGS. 1 to 3, 1 is a cylindrical main body, 2 is a hose, and 3 is a holding part for the hose 2. Also, 4 is the end packing, and 5 is the same end packing 4.
The housing part 6 is an expand ring, which is made of brass alloy. Reference numeral 7 denotes a synthetic rubber packing, and the end packing 4 is integrally formed at the end thereof. Both of these packings 4 and 7 are baked on the expand ring 6, for example, at 240°C.

Note that 2 is a hose as described above, which is made of synthetic fiber, and has a rubber layer 9 formed inside thereof. This rubber layer 9 is a layer made of natural rubber. The hose 2 is held in pressure contact with the holding part 3 by expanding the expand ring 6 using an expansion device using hydraulic pressure (not shown).

The synthetic rubber of the packing 7 is, for example,
NBR was used.

Effects of the invention This invention is constructed as described above, and by providing the packing 7 made of synthetic rubber on the outer circumferential surface of the expand ring 6 made of brass alloy, the rubber layer provided on the inner circumference of the hose 2 is 9 is expand ring 6
The copper component in the gel causes gelation, thereby preventing the hose 2 from falling off from the main body 1. This was revealed as a result of experiments.

Furthermore, since the packing 7 is made of synthetic rubber, it can be elastically deformed and expanded when the expand ring 6 expands, so that the packing 7 will not be damaged due to the expansion of the expand ring 6. There is no fear of being attacked. Furthermore, since the gasket 7 is made of synthetic rubber, its elasticity prevents the hose from slipping when using a hose that has a plastic layer inside instead of the rubber layer that is currently widely used. It is possible to prevent it from falling off.

Its elasticity can also serve as a cushion in the case of expansion of the expansion ring.

Furthermore, since the end gasket 4 is integrally formed with the synthetic rubber gasket 7,
The posture of the end packing 4 within the holding portion 3 can be stabilized, and therefore water leakage caused by the unstable posture can be prevented. Another effect is that since the end packing 4 is also made of synthetic rubber, it is chemically changed and gelled by the expand ring 6 into which it is fitted, thereby reducing the packing effect. It is possible to prevent this from happening.

[Brief explanation of the drawing]

Figures 1 to 3 show examples of this invention, with Figure 1 being a half-sectional view of a fire hose joint with a hose attached, and Figure 2 showing an expand ring with a packing used in the joint. Fig. 3 is a half-sectional view of the same ring, Fig. 4 is a half-sectional view of a conventional fire hose joint with a hose attached, and Fig. 5 is an exaggeration of the problem state of the joint. FIG. 1...Body, 2...Hose, 3...Holding part, 4
... End packing, 5... Accommodation section, 6... Expansion ring, 7... Synthetic rubber packing.

Claims (1)

[Claims for Utility Model Registration] 1. A holding portion 3 for the hose 2, which is formed on the inner surface of the cylindrical main body 1 and has a substantially serrated cross section;
accommodating part 5 for the end packing 4 formed at the base end of the holding part 3; a cylindrical expand ring 6 made of brass alloy inserted into the main body 1; The expand ring 6 is provided endlessly on the outer peripheral surface of the ring 6.
A fire hose joint characterized in that it consists of a synthetic rubber gasket 7 that elastically deforms and expands when the hose expands; and an end gasket 4 housed in the housing section 5. 2 Holding part 3 for the hose 2, which is formed on the inner surface of the cylindrical main body 1 and has a substantially serrated cross section; the main body 1
A accommodating portion 5 for the end packing 4 formed at the base end of the holding portion 3; a cylindrical expand ring 6 made of brass alloy and housed in the main body 1; A synthetic rubber packing 7 provided to fit into the pan ring 6; integrally formed at the end of the synthetic rubber packing 7;
an end gasket 4 fitted to the expand ring 6 and housed in the housing section 5;
A fire hose joint characterized by comprising: