JPH0647981Y2 - Drain pipe trap made of synthetic resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a drain pipe trap made of synthetic resin.

[Conventional technology and its problems]

In general, a drain pipe trap is a horizontal pipe with a diameter of 50 mm, which is used to drain sewage from the kitchen, bathroom, etc. into the sewer main.
A U trap (for example, see Japanese Utility Model Publication No. 37-5468) provided in the middle of a drainage pipe in a residential land of φ to 150 mmφ,
Recently, since the drainage pipe in the residential area uses a pipe made of PVC, the drainage pipe trap is also a U trap made of PVC.

By the way, this U-trap made of vinyl chloride, for example, has its major curvature formed by a large curvature of 120 ° or more, and is further provided with a minor curvature curved in the opposite direction continuously to this major curvature. Since the structure is such that the end of the small curved portion is provided with a socket, it was difficult to mold it with a simple rotary core, but a device that overcomes this difficulty (for example, Jikho Sho 58 No. 39865), various improvements have been made regarding the molding of U traps, and PVC U traps are now in widespread use.

However, since this type of PVC U-trap requires a fixed leg for positioning or preventing tilting, it is necessary to form the fixed leg in the outer mold of the injection molding die. there were. On the other hand, since the mold for molding is so important that it determines the quality of the molded product, its manufacturing requires extremely difficult technology and is sometimes designed by the can of the mold factory. Are extremely expensive. Therefore, there is a problem that the conventional mold for molding the U-trap with fixed legs made of vinyl chloride is expensive.

[Means for Solving the Problems]

Therefore, the present invention has been devised in order to eliminate such problems as much as possible, and the gist of the present invention is that the U-trap has a tapered shape at the time of injection molding, which is projected on the outer circumference of the bottom surface of the large curved portion. It is a drain trap made of synthetic resin, characterized in that the sprue is left as a fixed leg.

〔Example〕

The structure of the present invention, together with its operation, will be described in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 is a side sectional view of an embodiment of the present invention, FIG. 2 is a bottom view of an essential part of FIG. 1, and FIG. 3 is a side sectional view of another embodiment.

In these drawings, reference numeral 1 indicates a PVC drain pipe U trap, and this U trap 1 is formed by injection molding. A mold for molding the U trap 1 is composed of an outer surface outer mold, an inner surface outer mold, and a rotating core, which are not shown. A gate is opened in the outer surface outer mold, and a molten resin is press-fitted from the gate. Therefore, a sprue (here, a sprue is herein referred to as
In the injection molding, it means that the molten resin from the molding machine nozzle is solidified in the route to the gate of the single die.
2 remains. That is, the sprue 2 remains in the approximate center of the outer circumference of the bottom of the U-trap. This sprue 2
It is formed by a so-called direct gate, and it is tapered from the mold toward the molding machine nozzle with a gradient of 1.5 °.
Further, this sprue 2 is usually cut using a nipper or a cutter after forming the U trap, but in the present invention, this is not cut, and the conventional U trap is used instead of the integrally formed earth ring fixed leg. ing. Therefore, in the outer surface outer mold, the necessary sprue path is naturally provided and the shape of the fixed leg is not recessed. Therefore, the mold becomes a simple mold, and if the sprue 2 is inserted into the U trap burying position, This positioning and tilt prevention.

That is, for example, in FIG. 3, when the U trap 1 is used when constructing a pipe in a residential land, the following can be done. When joining the drain pipe 22 on the upstream side and the drain pipe 23 on the downstream side via the U trap 1, the sprue 2 of this U trap 1 is pierced into the excavation groove and temporarily placed, and these drain pipes 22 , 23 can be measured. In addition, in FIG. 3, 24 is a cleaning pipe, 25 is cheese, and 26 is an elbow.

Next, to describe an example in which the U trap 1 of the present embodiment is applied to a small-diameter basin, a cleaning port pipe receptacle 4 is opened upward in the small-diameter basin body 3, and an overflow is provided immediately below in a substantially central position. A dam 5 is provided so as to project from the bottom, a drain pipe flow path 6 is formed on one side of the dam 5, and a trap receiving port 7 for joining the U trap 1 is opened downward on the other side. The outlet port 9 of the U-trap 1 is inserted into the trap receiving port 7 through a diameter-reducing bush 8 having the following structure and joined as a port. That is, the diameter-reducing bush 8 is formed of a concentric double ring, and the ring 10 on the outer periphery of the bush 8 is used as the trap receiving port 7.
It is rotatably fitted to the inner wall of the ring 11 and has a second trap receiving port 12 having a diameter reduced to a predetermined size on the inner ring 11. Further, the O-ring groove 13 is formed in the trap receiving port 7,
An O-ring 14 is fitted therein, and a plurality of hooking projections 15 are formed in the upper connecting portion between the outer ring 10 and the second trap receiving port 12, and the hooking projections 15 are formed. The diameter-reducing bush 8 is attached to the small-diameter basin body 3 by being locked to the upper end of the trap receiving opening 7.

Therefore, an adhesive is applied to the outer circumference of the outflow port 9 of the U trap 1 to be fitted into the second trap receiving port 12 and fixed,
Put the U-trap 1 against the small-diameter basin body 3 and the outer ring 10
Also, the hooking projection 15 can be used as a turning surface to swing.

[Effect of device]

According to the present invention, since the sprue at the time of injection molding protruding on the bottom of the outer circumference of the large curved portion of the U trap is left as a substitute for the fixed leg, only the sprue required at the time of molding becomes the shape of the mold. It can be simplified and can contribute to cost reduction of the mold. Moreover, since this sprue is tapered from the U trap, it can be used for positioning the U trap and preventing tilting.

In addition, this sprue can be provided by simply cutting it for use in U-traps that do not require fixed legs.

Furthermore, since the sprue path is provided on the outer circumference of the bottom surface of the large curved portion of the U trap, the molten resin can be filled well.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention, FIG. 2 is a bottom view of an essential part of FIG. 1, and FIG. 3 is a side sectional view of another embodiment. 1 ... U trap, 2 ... spruce.

Claims (1)

[Scope of utility model registration request] 1. A drain trap made of synthetic resin, characterized in that a tapered sprue, which is provided at the outer periphery of the bottom surface of a large curved portion of a U trap, is left as a fixed leg during injection molding to form a fixed leg.