JP2001173859A - Aseismatic tube fitting having marring preventive function of insertion port projected part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damaging of an insertion port projected part by a lock ring at the time of connecting pipes and to simplify pipe connection without recovering jig to prevent marring after construction. SOLUTION: A protective member 4 made of a support ring 2 engaged with a socket opening side part of a lock ring storage groove 11b on an inner surface of a socket 11 and a skirt type cover 3 extended to an inner surface of a lock ring 13 stored in the lock ring storage groove by the support ring 2 is installed from a socket opening side part of the lock ring storage groove 11b over to the inner surface of the lock ring 13 and an insertion port projected part 1a of an insertion port 1 makes contact with the lock ring 13 through the skirt type cover 3 and passes through it at the time of connecting pipes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic pipe joint having a function of preventing an insertion projection from being damaged.

[0002]

2. Description of the Related Art A seismic pipe joint as shown in FIG. 5 is known as a pipe joint of a metal pipe such as a ductile cast iron pipe.
The seismic pipe joint 10 has a seal rubber ring storage groove 11a and a lock ring storage groove 11b formed on the inner surface of the receiving port 11, and the seal rubber ring 12 is formed in the seal rubber ring storage groove 11a as shown in the drawing. After mounting the centering rubber 14 and the lock ring 13 in the lock ring storage groove 11b, insert the insertion port 1 having the insertion projection 1a at the tip beyond the lock ring 13 and remove it from the joint section 10. When the power is working,
The insertion projection 1a and the lock ring 13 are engaged with each other to prevent escape.

[0003]

By the way, when the above-mentioned earthquake-resistant pipe joint 10 is joined, as shown in FIG.
a is inserted deep into the receptacle 11 while pushing and expanding the lock ring 13 by the tapered portion 1b. At this time, since the lock ring 13 comes into strong frictional contact with the lock ring 13, the corrosion-resistant coating on the outer surface of the insertion projection 1a is damaged. There has been a problem that inconvenience arises in corrosion protection.

[0004] In order to solve such a problem, when the insertion port 1 is inserted into the receiving port 11 as shown in FIG. The insertion member 15 is arranged, the insertion port 1 is inserted into the receiving port 11 (FIGS. 5 and 6) together with the insertion member 15, and the insertion projection 1a is encased by the insertion member 15 to lock the lock ring 13. To prevent the insertion protrusion 1a from being scratched, and then the interleaved member 15 may be collected by pulling the tied withdrawal cord 16.

However, in this case, there is a problem that the work of pulling out the insertion member 15 becomes necessary after the work of connecting the pipes, and the number of work steps increases. The present invention solves the above problems, prevents damage to the insertion projection by a lock ring at the time of pipe connection, and simplifies pipe connection without having to collect a jig for preventing damage after construction. Was made as an issue.

[0006]

In order to achieve the above object, according to the present invention, there is provided a support ring which is locked on a side of a receiving ring opening of a lock ring receiving groove on an inner surface of a receiving port. A protection member consisting of a skirt-shaped cover extending to the inner surface of the lock ring housed in the lock ring housing groove is attached from the socket opening side of the lock ring housing groove to the inner surface of the lock ring, and when connecting a pipe. The insertion projection of the insertion hole comes into contact with the lock ring via the skirt-shaped cover and passes therethrough.

Therefore, according to the present invention, the inner surface of the lock ring is covered with a skirt-shaped cover, which serves as a protective cover when the insertion projection is inserted, thereby protecting the surface of the insertion projection from damage.

[0008]

Next, an embodiment of the present invention will be described. FIG. 1 is an explanatory perspective view of an anti-scratch ring of an insertion projection according to the present invention. FIG. 2 is a sectional view of a seismic pipe joint having an anti-scratch function of an insertion projection according to an embodiment. FIG. 5 is a process explanatory view showing a connection state.

In FIG. 1, reference numeral 2 denotes a support ring, as shown in FIG. 2, which is attached to, for example, a groove wall 11c of the lock ring mounting groove 11b on the inner surface of the receptacle 10 on the side of the receptacle opening. The support ring 2 is integrally formed with a skirt-shaped cover 3 having a length that can be tapered along the inner surface of the groove wall 11c and the inner surface of the lock ring 13 and that can extend to the inner surface of the lock ring 13. However, as shown in FIG. 1, it is divided in the axial direction so that the diameter can be reduced and expanded.

[0010] The support ring 2 and the skirt-shaped cover 3 are integrally formed of a slippery resin such as a polyethylene resin.
Note that the split portion of the damage prevention ring 4 is not particularly required when the whole is formed of an elastic material such as polyethylene resin as described above. Further, the skirt-shaped cover 3 has a thickness of 200 μm to 500 μm. If the thickness is less than 200 μm, the lock ring 13 is too thin.
Damage to the surface of the insertion projection 1a due to the
If the thickness is larger than 500 μm, the lock ring 13 is pressed against the storage groove 11b by the thickness, and the detachment prevention function is impaired.

Next, the operation of the seismic pipe joint having the function of preventing the insertion projection from being damaged will be described. As shown in FIG.
After mounting the centering rubber 14 and the lock ring 13 in the lock ring storage groove 11b on the inner surface, the damage prevention ring 4 of the insertion projection of the present invention is mounted. In this mounting, the portion of the support ring 2 abuts on the groove wall 11c, and the skirt-like cover 3 extending from the support ring 2 is made to follow the inner surface of the lock ring 13. At this time, the end of the skirt-shaped cover 3 does not protrude deeper than the lock ring 1.

Next, the sealing rubber ring 12 is mounted in the sealing rubber ring storage groove 11a, and the preparation of the receiving port 10 side is completed. Next, as shown in FIG. 4, the insertion slot 1 is inserted. At this time, the insertion projection 1a is attached to the cover 3 of the damage prevention ring 4.
Is in contact with the lock ring 13. Therefore, damage to the corrosion-resistant coating film on the outer surface of the insertion projection 1a is prevented.

In addition, the damage prevention ring 4 of the insertion projection is
After the insertion port 1 is connected, it is left as it is on the inner surface of the receiving port 11, but since the skirt-shaped cover 3 does not protrude to the back of the pipe from the lock ring 13, there is no adverse effect on the function of preventing the joint from being pulled out. . Therefore, according to the seismic pipe joint having the function of preventing the insertion projection from being damaged in this embodiment,
It is possible to insert the insertion port into the receptacle without damaging the surface of the insertion projection, and even if the ring for preventing damage to the insertion projection is left after connection, Since there is no adverse effect, there is no need to remove it during the connection work.

[0014] A pipe joint having a structure for preventing the lock ring from coming off is a seismic pipe joint in which the lock ring is pushed out and inserted when the insertion hole is inserted, as shown in the above embodiment. Not only joints but also other types can be similarly implemented.

[0015]

As described above, according to the earthquake-resistant pipe joint of the present invention having the function of preventing the insertion projection from being damaged, the connection of the insertion can be performed without damaging the surface of the insertion projection. In addition, even if the damage prevention ring of the insertion projection is left unattended after connection, there is no adverse effect on the detachment prevention function of the fitting,
There is no need to remove it at the time of connection work, and therefore, the work of pulling out the intervening member, which was conventionally required, is not required at all, and the pipe laying work is simplified.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a damage prevention ring of an insertion projection according to the present invention.

FIG. 2 is a sectional view of a main part showing a seismic pipe joint having a function of preventing an insertion projection from being damaged according to the present invention;

FIG. 3 is a process explanatory view showing a connection state.

FIG. 4 is a process explanatory view showing a connection state.

FIG. 5 is an explanatory sectional view of a conventional earthquake-resistant pipe joint.

FIG. 6 is an explanatory sectional view showing a joined state of a conventional earthquake-resistant pipe joint.

FIG. 7 is an explanatory sectional view of a conventional means for preventing an insertion projection from being damaged.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insert 1a Insert projection 2 Supporting ring 3 Skirt cover 4 Damage prevention ring of insertion projection 10 Fitting 11 Reception port 12 Sealing ring 13 Lock ring 14 Centering ring

Claims (1)

[Claims] 1. A support ring which is locked to a side of an opening of a lock ring storage groove on an inner surface of a reception opening, and extends from the support ring to an inner surface of the lock ring stored in the lock ring storage groove. A protective member comprising a skirt-shaped cover is attached from the side of the receiving opening of the lock ring storage groove to the inner surface of the lock ring, and at the time of pipe connection, the insertion projection of the insertion port is interposed through the skirt-shaped cover. A seismic pipe joint having a function of preventing the insertion projection from being damaged in contact with and passing through the lock ring.