JPH0726601A - Water-spouting device and production thereof - Google Patents

Abstract

PURPOSE:To improve the efficiency of production, by a method wherein a water- spouting device consisting of a connection part, a guide part and a water supply part is integrally molded out of synthetic resin, using, gas injection molding. CONSTITUTION:A water-spouting device 10 consisting of a connection part 11, a vertically standing part 12 as a guide part and an inclination part 13 as a water supply part is integrally molded out of synthetic resin, using gas injection molding as gas-blow molding. A male thread is wrought on the peripheral part of a cylindrical connection part 11 and is screwed into the female thread on the top end of a water supply pipe, and the connection part 11 is allowed to communicate with the water supply pipe. Furtheremore, a spout opening 13a is formed on the undersurface at the top end part of the inclination part 13 and a flow-distribut plate is inserted into the top end part of the spout opening 13a. Therefore, water is prevented from leaking at a boundary between assembled parts because of integral molding and the quality of the water- spouting device can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water discharge device and a method for manufacturing the same, and in particular, a water discharge device which is integrally formed of synthetic resin and is applied to a low tank water discharge port of a flush toilet or a shower head. The present invention relates to a device and a manufacturing method thereof.

[0002]

2. Description of the Related Art As a conventional water discharge device of this type, there is a technique shown in FIGS.

FIG. 7 is a perspective view showing a state in which a water discharger is attached to a low tank of a flush toilet. 8 is a cross-sectional view showing a conventional water discharger, and FIG. 9 is a rear view showing the conventional water discharger.

In FIG. 7, a low tank 1 of a flush toilet.
The water discharger 50 for water supply attached to is generally formed of a metal having corrosion resistance such as stainless steel, but recently, it has been proposed to form a synthetic resin in order to reduce costs. Conventionally, the water discharge device 50 made of synthetic resin is formed into a desired shape by injection molding.

For example, in FIGS. 8 and 9, the water discharge device 50 includes a water discharge portion 51, a connecting portion 52 and a cap 53. The water discharge portion 51 is formed in a bent tubular shape by a vertical portion 51a vertically arranged in the raw tank 1 and a sloped portion 51b extending laterally from the upper end of the vertical portion 51a.
A water discharge hole 51c is provided on the lower surface of the tip of the inclined portion 51b. Further, the water discharge part 51 is provided with a mounting hole 51d for mounting the cap 53 on the side surface of the upper end part of the upright part 51a opposite to the inclined part 51b, and at the lower end part of the upright part 51a, an enlarged diameter part 51e is formed. is doing. And the cap 5
3 is adhered and fixed to the mounting hole 51d of the water discharge part 51.
On the other hand, the connecting portion 52 has a cylindrical shape, and the upper end portion thereof is a close fitting portion 52a which is tightly fitted and adhered to the inner peripheral surface of the lower diameter expanding portion 51e of the water discharge portion 51, and the low tank 1 is provided on the outer periphery of the lower end portion. A male screw 52b that is screwed into a female screw at the tip of the water pipe 2 disposed inside is threaded. Then, the connecting portion 52 is
The tight fitting portion 52a is tightly fitted to the expanded diameter portion 51e of the water discharge portion 51 to be adhesively fixed, and is also screwed and fixed to the low tank 1 via the male screw 52b to be connected to the water distribution pipe 2 to communicate with the water distribution pipe 2. It is supposed to do. Thereby, the water discharge device 50
Is attached to the raw tank 1. In addition,
The water discharge hole 51c of the water discharger 51 of the water discharge device 50 is fitted with a flow straightening plate 54 that straightens the water discharge.

Next, a method of manufacturing the conventional water discharger 50 configured as described above will be described.

In order to manufacture the water discharger 50 having the shape shown in FIGS. 8 and 9, first, the first slide die having a shape corresponding to the inner surface shape of the upright portion 51a of the water discharge portion 51, and the inclined portion 51.
Injection molding of the water discharge part 51 is performed using a second slide mold having a shape corresponding to the inner surface shape of b. That is, the first slide mold and the second slide mold are inserted into a mold for molding the water discharge part 51, a predetermined synthetic resin is injected, the mold is opened, and then the first slide mold is moved to the water discharge part 51. Vertical section 51
The second slide mold is pulled out from the lower end opening of a and the mounting hole 51d at the upper end of the upright portion 51a. On the other hand, the connecting portion 52 and the cap 53 are separately injection molded from a predetermined synthetic resin, and after the water discharge portion 51 is completed,
Each of them is adhered and fixed to the mounting hole 51d and the inner peripheral surface of the expanded diameter portion 51e. Thereby, the water discharge device 50 shown in FIG. 8 and FIG.
Is completed.

[0008]

DISCLOSURE OF THE INVENTION Conventional water discharge device 50
Is configured as described above, the number of parts is as many as three, that is, the water discharge part 51, the connection part 52, and the cap 53,
A mold is required for molding each part. Further, it is necessary to tightly fit and bond the connection part 52 to the water discharge part 51 and fit and bond the cap 53, and
The expanded diameter portion 51e of the water discharge portion 51 and the tight fitting portion 52a of the connection portion 52
It is necessary to secure dimensional accuracy and adhesive strength between the cap 51 and the mounting hole 51d of the water discharge part 51 and the cap 53, which may complicate the work and reduce the production efficiency. Furthermore, since the cap 53 is visually recognized from the outside, the appearance quality of the water discharge device 50 as a whole may be deteriorated.

Further, in order to manufacture the conventional water discharger 50, the water discharger 51, the connecting portion 52, and the cap 53 are separately injection-molded, so that the number of manufacturing steps increases, the production efficiency decreases, and the cost increases. May cause rise. Further, since the water discharger 51 has a bent shape, it is necessary to use two slide molds, a first slide mold and a second slide mold, for injection molding of the water discharger 51, but use of the slide mold is considerable. There is room for improvement in terms of cost reduction, as it will increase costs. In addition, since it is necessary to provide the water discharge part 51 with a mounting hole 51d that is a hole for removing the second slide die from the inclined part 51b of the water discharge part 51, it is necessary to shield the mounting hole 51d with the cap 53. Therefore, as described above, there is a possibility that production efficiency may be reduced, cost may be increased, or appearance quality may be reduced. On the other hand, in order to complicate the shape of the water discharge part 51, it is necessary to increase the number and type of slide molds correspondingly, and there is a limit to the increase of slide molds in terms of cost, etc. The degree of freedom of the shape of the water discharger 51, which is the main shape of the water discharger 50, is also low. In particular, when the water discharge portion 51 is curved in a plurality of directions, its molding is difficult.

Therefore, the present invention provides a water spouting device and a method for manufacturing the same, which can be integrally molded entirely of synthetic resin and which can eliminate costs for a slide mold and can reduce costs, improve production efficiency and improve appearance quality. This is an issue.

[0011]

According to another aspect of the present invention, there is provided a water discharge device which is connectable to a water pipe and has a cylindrical connecting portion which communicates with the water pipe and which is extended to the connecting portion. A tubular guide portion that communicates with the connection portion, and a tubular water supply portion that extends in the guide portion at a predetermined bending angle and that communicates with the guide portion and that has a water discharge hole at the tip are provided in a predetermined manner. It is integrally formed of the synthetic resin.

According to a second aspect of the present invention, there is provided a water discharge device manufacturing method, wherein a space-like cavity extending in a predetermined direction, a gas inlet communicating with one end of the cavity in the extending direction, and an extending direction of the cavity. Using a mold having a predetermined space-like gas blowing portion that communicates with the other end, in the resin injecting step, the molten synthetic resin is injected into the cavity, and in the gas injecting step, the gas injecting port of the die is used. A gas is injected into the molten synthetic resin from the inside of the cavity, and the molten synthetic resin is pressed against the cavity surface from the inside by gas pressure to hold the molten synthetic resin in a shape corresponding to the cavity shape. A water supply passage is formed in the molten synthetic resin, the water supply passage extending from the gas inlet to the gas outlet, and is cooled and solidified in the cutting step. Said gas injection port side and the gas outlet side of the resin by cutting is to open the extending direction ends of the water supply passage.

In the resin injection step, it is possible to inject the molten synthetic resin into the cavity in a full shot and then inject the molten synthetic resin into the gas blowing portion by gas pressure.

[0014]

According to the invention of claim 1, when the water spouting device is connected to the water distribution pipe through the connection part to supply water, the water supply is discharged to the outside from the spouting hole of the water supply part through the connection part and the guide part. . At this time, the connection part, the guide part, and the water supply part are integrally formed of the same synthetic resin, so that the entire water supply passage in the water discharge device is a single and homogeneous molded product.

According to the second aspect of the invention, the molten synthetic resin injected into the cavity in the resin injection step forms a space inside and expands outward due to the gas pressure injected into the cavity in the gas injection step. Then, it is pressed against the surface of the cavity and shaped into the same outer shape as the cavity. In the molten synthetic resin, a gas pressure causes gas to flow from the gas inlet to the gas outlet to form a water supply passage that communicates from the gas inlet to the gas outlet. Then, by cutting the gas inlet side and the gas outlet side of the synthetic resin cooled and solidified in the cutting step, by opening both ends in the extending direction of the water supply passage,
A tubular water discharger that extends in a predetermined direction and has openings at both ends in the extending direction is integrally molded of a predetermined synthetic resin. Therefore, by connecting the opening at one end of the water discharger to the water distribution pipe, water can be freely discharged from the opening at the other end. on the other hand,
Even if the water spouting device has a complicated shape such as a multi-step curved shape, the gas from the gas inlet flows through the molten synthetic resin to the gas outlet along the extending direction of the cavity and then spreads into the molten synthetic resin. A water supply passage is formed as an internal space extending along the installation direction.

[0016]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 is a sectional view showing a water discharger according to the first embodiment of the present invention, and FIG. 2 is a rear view showing the water discharger according to the first embodiment of the present invention. 3A and 3B are schematic process diagrams showing a method for manufacturing a water discharger according to a first embodiment of the present invention, where FIG. 3A is a resin injection process, FIG. 3B is a gas injection process, and FIG. Indicates the end of the process. FIG. 4 is a sectional view showing a state in which the gas inlet and the gas outlet of the water discharger of the first embodiment of the present invention are cut.

In the drawings, the same reference numerals and symbols as those of the conventional example indicate the same or corresponding parts as those of the conventional example, and therefore, duplicated description will be omitted here.

In the figure, the water discharge device 10 of this embodiment is
The connection part 11, the upright part 12 as a guide part, and the inclined part 13 as a water supply part, which are embodied in the spout of the low tank 1 of the flush toilet, are formed by using gas injection molding as gas hollow molding. It is made of synthetic resin and integrally molded into a bent tubular shape. The connecting portion 11 has a cylindrical shape, and has a male screw threaded on a female screw at the end of the water pipe 2 in the low tank 1 which is threaded on the outer periphery so as to be connectable to the water pipe 2 and communicate with the water pipe 2. It is supposed to do. The upright portion 12 extends in the same direction as the connecting portion 11 and is integrally formed to form a tubular shape that communicates with the connecting portion 11.
By connecting and fixing 1 to the water distribution pipe 2 in the raw tank 1, it is arranged to stand upright in the raw tank 1.
The inclined portion 13 is integrally formed with the upright portion 12 so as to extend laterally from the upper end of the upright portion 12 at a predetermined bending angle, and has a tubular shape that communicates with the upright portion 12. ing. A water discharge hole 13a is provided on the lower surface of the tip of the inclined portion 13. The connection portion 11, the upright portion 12, and the inclined portion 13
A water supply passage 15 for supplying the water supplied from the water distribution pipe 2 to the water discharge receiving portion 1a of the low tank 1 is formed by each inner peripheral surface and the water discharge hole 13a of the inclined portion 13. Although not shown, in the water discharge hole 13a of the water supply unit 13 of the water discharge device 10,
Similar to the conventional example, a rectifying plate 54 for rectifying the discharged water is inserted.

The water discharge device 10 constructed as described above is
By screwing the male screw of the connection portion 11 into the female screw of the water distribution pipe 2 in the low tank 1, it is fixed to a predetermined position behind the water discharge receiving portion 1 a on the upper surface of the low tank 1 via the connection portion 11. Then, when water is supplied to the water discharger 10 via the water distribution pipe 2, the water is discharged from the water discharge port 13a of the inclined portion 13 to the water discharge receiver 1a of the low tank 1 via the connection portion 11 and the upright portion 12, and the low tank 1 Water can be supplied inside. At this time, the connecting portion 11, the upright portion 12, and the inclined portion 13
Is integrally formed of the same synthetic resin, the entire water supply passage in the water discharge device 10 is single,
And it becomes a homogeneous molded product.

Next, a method of manufacturing the water discharger 10 of the present embodiment having the above-mentioned structure will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, the water discharger 10 of this embodiment uses a mold having a cavity 21, a gas inlet 22 and a gas outlet 23, and uses a known synthetic resin. It is obtained by integrally molding by a gas injection molding method. The cavity 21 of the mold has the same shape as the outer shape of the water discharge device 10 and has a bent space shape extending in a predetermined direction.
Due to its surface, the connecting portion 11, the upright portion 12, and the inclined portion 13
Shape. Further, the gas injection port 22 is the water discharge hole 1 on the lower surface at one end (on the inclined portion 13 side) in the extending direction of the cavity 21.
The gas G from a gas injection nozzle (not shown) is arranged so as to extend in the axial direction of the water discharge hole 13a so as to communicate with the position corresponding to 3a, and the molten synthetic resin R in the cavity 21 is passed through the gas injection port 22. It can be freely injected into. Further, the gas blowout portion 23 is arranged so as to communicate with the other end (on the side of the connection portion 11) in the extending direction of the cavity 21 and extend in the axial direction of the upright portion 12 and the connection portion 11, and from the connection portion 11. It is a large-diameter predetermined space. It should be noted that the synthetic resin R is one having heat resistance, and the viscosity thereof has a certain limit so that it can smoothly flow in the cavity 21 by the pressure of the gas G. Examples of such synthetic resin R include AB
S resin or polypropylene (PP) resin can be used.

In order to carry out gas injection molding using such a mold, first, as shown in FIG. 3A, in a resin injection step, molten synthetic resin R is injected into the cavity 21 by a short shot. Next, FIG.
As shown in (b), in the gas injection step, a gas (nitrogen gas as an inert gas) G is injected into the molten synthetic resin R in the cavity 21 from the gas injection port 22 of the mold. Then, the gas G enters the molten synthetic resin R to form a space inside the molten synthetic resin R, urges the molten synthetic resin R from the inside toward the surface of the cavity 21 to expand, and press-contacts the surface of the cavity 21. Let In addition, when the amount of the gas G injected into the molten synthetic resin R increases, as shown in FIG.
As shown in (b), the molten synthetic resin R is
Flows and flows into the gas outlet 23. Then, as shown in FIG. 3C, when the molten synthetic resin R flows into the entire gas blowing portion 23, further flow of the molten synthetic resin R is stopped, and the gas G causes the molten synthetic resin R to flow into the cavity 2
The molten synthetic resin R is held in a shape corresponding to the shape of the cavity 21, that is, the shape of the water discharger 10 of the first embodiment by keeping pressure on the surface of No. 1 in a pressed state. On the other hand, when the molten synthetic resin R is caused to flow from the gas blowing port 22 into the gas blowing portion 23 by the gas G pressure injected from the gas blowing port 22 into the molten synthetic resin R, the gas blowing port 22 passes through the gas blowing port 23. A water supply passage 15 that communicates with and extends to is formed. After that, the molten synthetic resin R is cooled and solidified, whereby the water discharger 1
0 is molded into a state in which a cylindrical synthetic resin corresponding to the gas blowing port 22 and a synthetic resin having a shape corresponding to the gas blowing portion 23 are integrally formed at both ends thereof. Next, as shown in FIG. 4, the mold is opened, and in the cutting step, the synthetic resin gas blowing port portion 25 is cut to form the water discharge hole 13a, and the synthetic resin gas blowing portion portion 26 is cut. Disconnect
The lower end of the connecting portion 11 on the gas outlet portion 23 side of the water supply passage 15 is opened. As a result, as shown in FIGS. 1 and 4,
The tubular water discharger 10 that extends in the predetermined direction and has openings at both ends in the extending direction can be integrally molded of the same synthetic resin.

In the above, in order to improve the material yield, the amount of the molten synthetic resin R to be injected and the amount of the synthetic resin R to be injected are controlled so that the synthetic resin flowing into the gas blowing portion 23 is as thin as possible and the amount thereof is small. The size, volume, etc. of the gas blowing portion 23 are adjusted.

Next, another embodiment according to the present invention will be described below. Only the differences from the first embodiment will be described in each embodiment, and the same components as those in the first embodiment will be designated by the same reference numerals in the drawings and will not be described.

FIG. 5 is a sectional view showing a water discharger according to the second embodiment of the present invention.

In FIG. 5, the water discharger 30 of the present embodiment.
Is embodied in the spout of the low tank 1 of the flush toilet, as in the first embodiment, and utilizes gas injection molding to utilize the connection part 31, the upright part 32 as a guide part, and the inclined part 33 as a water supply part. Is formed integrally with a predetermined synthetic resin into a bent tubular shape, but the upright portion 32 is formed into a curved tubular shape that is slightly inclined rearward of the low tank 1 and mainly has a roundness in the first embodiment. It is different from the example water discharger 10. The configurations of the connection portion 31 and the inclined portion 33 are almost the same as those of the water discharger 10 of the first embodiment, and by connecting and fixing the connection portion 31 to the water distribution pipe 2 in the low tank 1, the water discharger is attached to the low tank 1. 30 are arranged. A water discharge hole 33a is provided on the lower surface of the tip of the inclined portion 33, as in the first embodiment.

The water discharger 30 constructed as described above is
The water discharger 10 of the first embodiment operates in the same manner and has the same effect. The manufacturing method thereof is also the same as that of the first embodiment, and the cavity shape and the like of the mold differ only in accordance with the shape of the water discharger 30.

FIG. 6 is a sectional view showing a water discharger according to the third embodiment of the present invention.

In FIG. 6, the water discharge device 40 of this embodiment is shown.
Is different from the first and second embodiments in that it is embodied as a shower head. The water spouting device 40 utilizes gas injection molding, and is connected to a shower hose (not shown) as a water distribution pipe by screwing and connecting with a connecting portion 41.
The guide part 42 and the water supply part 43 are integrally molded in a bent cylindrical shape from a predetermined synthetic resin. Further, a water discharge hole 43a is provided on the front end surface of the water supply unit 43.

The water discharge device 40 constructed as described above is
The water discharge devices 10 and 30 of the first and second embodiments operate in the same manner and have the same effect. The manufacturing method is also the same as in the first and second embodiments, and the cavity shape of the mold and the like differ only in accordance with the shape of the water discharger 40.

As described above, the water discharger 10 of the above embodiment,
Numerals 30 and 40 are screwed to the water distribution pipe 2 so that they can be freely connected to each other.
1, 31, 41 and the connecting portions 11, 3 made of the synthetic resin
A cylindrical guide portion 12, which is coaxially extended to the upper ends of the terminals 1, 41 and is integrally formed, and which communicates with the connection portions 11, 31, 41.
32, 42 and the guide portions 12, 32, made of the synthetic resin.
42 A cylindrical water supply part 13, 33 which is integrally formed by being extended at a predetermined bending angle at the upper end of 42, communicates with the guide parts 12, 32, 42, and has water discharge holes 13a, 33a, 43a formed at the tips thereof. , 43.

Therefore, in the above embodiment, the water discharger 1
When 0, 30, 40 is connected to the water distribution pipe 2 via the connecting portions 11, 31, 41 and water is supplied, the water is supplied to the connecting portions 11, 3.
1, 41 and the guide portions 12, 32, 42, and then the water supply portion 1
The water is discharged from the water discharge holes 13a, 33a, 43a of 3, 33, 43 to the outside. At this time, the connecting portions 11, 31, 41,
Since the guide portions 12, 32, 42 and the water supply portions 13, 33, 43 are integrally formed of the same synthetic resin,
The entire passage of the water supply in the water discharge device 10, 30, 40 becomes a single and homogeneous molded product. As a result, there is no water leakage from the assembly boundary between the parts,
The product quality can be improved, and the appearance of the entire water discharge device is uniform and uniform, so that the appearance quality can be improved. On the other hand, the water discharge device 10, 3
Only one mold is required for molding 0, 40, and there is no need to assemble each component (connecting part 52 and cap 53) as in the case where there are multiple components as in the conventional example. Since it is not necessary to secure dimensional accuracy between the parts to be assembled with each other, it is possible to improve production efficiency and reduce product cost.

Further, the water discharge device 10, 30,
The manufacturing method of 40 is a cavity 2 having a bent space shape extending in the same predetermined direction as the outer shapes of the water discharge devices 10, 30, 40.
1 and one end in the extending direction of the cavity 21 (the water discharge hole 13
a, 33a, 43a side), a gas inlet 22 communicating with
The other end of the cavity 21 in the extending direction (connecting portions 11, 31, 4
Resin injection step of injecting the molten synthetic resin R into the cavity 21 of the mold by a short shot, and a gas of the mold. Gas G is injected into the molten synthetic resin R in the cavity 21 from the blow-in port 22, and the molten synthetic resin R is urged and pressed against the surface of the cavity 21 from the inside by the gas G pressure to hold the molten synthetic resin R in a shape corresponding to the shape of the cavity 21. At the same time, it is made to flow into the gas outlet 23 from the gas inlet 22,
A gas injection step of forming a water supply passage 15 communicating from the gas injection port 22 to the gas injection port 23, and cutting the gas injection port portion 25 and the gas ejection portion portion 26 of the cooled and solidified synthetic resin after opening the mold to supply water. And a cutting step of opening both ends of the passage 15.

Therefore, in the above embodiment, the molten synthetic resin R injected into the cavity 21 in the resin injection step
In the gas injecting step, the gas G is injected into the inside to form a space inside and expand outward, and is pressed against the surface of the cavity 21 and shaped into the same shape as the shape of the cavity 21. In addition, the molten synthetic resin R flows into the gas blowing portion 23 from the gas blowing port 22 by the gas G pressure, and has a space-like water supply passage 15 that extends in communication with the gas blowing port 22 to the gas blowing portion 23. Form. Then, in the cutting step, by cutting the gas inlet port portion 25 and the gas outlet portion portion 26 of the synthetic resin that has been cooled and solidified to open both ends of the water supply passage 15, a curved tubular water discharge device 10 extending in a predetermined direction, 30 and 40 are integrally molded from a predetermined synthetic resin. Therefore, by connecting the connection portions 11, 31, 41 at one end of the water discharge device 10, 30, 40 to the water distribution pipe 2, water discharge from the water discharge ports 13a, 33a, 43a, which are the other end openings, becomes possible. As a result, compared with the case where a plurality of parts are separately injection-molded, the molding can be performed with one mold, and the manufacturing process can be reduced and the production efficiency can be improved. In addition, it is not necessary to assemble each part as in the case of multiple components, and it is not necessary to secure dimensional accuracy between the parts where each part is assembled, thus improving production efficiency. Product cost can be reduced.

On the other hand, when the water discharger 10, 30, 40 has a bent cylindrical shape as described above, particularly when it has a complicated shape such as a multi-step curved shape, the gas G from the gas inlet 22 is The molten synthetic resin R flows along the extending direction of the cavity 21 to the gas blowing portion 23, and the water supply passage 15 is formed in the molten synthetic resin R as an internal space extending along the extending direction. As a result, even if the water dischargers 10, 30, 40 have a complicated shape, the cylindrical water discharger 10 having a desired shape,
It is possible to mold 30, 40, and the water discharge device 10, 30,
The shape of 40 can be complicated, and the degree of freedom of shape is high. Then, the water discharge device 10, 30, 40 is generated by the gas G pressure.
Since the water supply passage 15 is formed inside, it is not necessary to use a slide mold that causes an increase in manufacturing cost, and cost can be reduced. In addition, since the slide mold is not used, it is not necessary to provide the mounting hole 51d which is a hole for removing the slide mold unlike the conventional example, and the mounting hole 51d is shielded by the cap 53 which is a separate member. No such work is required, and there is no fear of cost increase, workability deterioration, or appearance quality deterioration. Further, the present invention can be sufficiently applied to products that emphasize the appearance design, as compared with blow-molded products.

By the way, the water discharge devices 10 and 3 of the above embodiment.
Although 0 and 40 are embodied in the spout or the shower head of the low tank 1 of the flush toilet, the present invention is not limited to this, and an integrally molded product such as a faucet article, In particular, it can be embodied in a product having a shape that requires molding by a conventional slide mold.

Further, the water discharge device 10, 30,
Although 40 is formed in a bent cylindrical shape, the present invention is not limited to this, and as long as molding by gas injection molding is possible, for example, a multi-step curve such as an S shape is formed. Other shapes such as a tubular shape or a spiral tubular shape may be used as required.

Then, the water discharge devices 10 and 3 of the above embodiment.
In the manufacturing method of 0 and 40, the gas blowing port 22 is provided at one end of the cavity 21 and the gas blowing port 23 is provided at the other end, and the gas blowing port 22 is set to the water discharge holes 13a, 33a, 43a side, and the gas blowing port 23 is provided. Although the connection portions 11, 31, 41 are provided, the gas blowout portion 23 is used as the water discharge holes 13a, 33.
a, 43a side, and the gas injection port 22 is connected to the connection parts 11, 3
It may be the 1,41 side. Further, the water discharger may be formed into a shape having a plurality of water discharge holes, and the gas inlet 22 may be connected to the plurality of water discharge holes to inject the gas G.
Further, the shape of the gas blowing port 22 or the shape of the gas blowing portion 23 can be appropriately changed. Furthermore, in the resin injecting step, the molten synthetic resin R may be injected into the cavity 21 in a full shot, and then the molten synthetic resin R may be injected into the gas blowing portion 23 by gas pressure.

[0040]

As described above, the water discharger according to the invention of claim 1 can be freely connected to the water distribution pipe, and has a cylindrical connecting portion that communicates with the water distribution pipe, and extends to the connecting portion. A tubular guide portion that communicates with the connection portion, and a tubular water supply portion that extends in the guide portion at a predetermined bending angle, communicates with the guide portion, and has a tubular shape that has a water discharge hole at the tip, It is integrally formed of a predetermined synthetic resin.

Therefore, when the water spouting device is connected to the water distribution pipe through the connection part to supply water, the water supply is discharged to the outside from the water spouting hole of the water supply part through the connection part and the guide part. At this time, the connection part, the guide part, and the water supply part are integrally formed of the same synthetic resin, so that the entire water supply passage in the water discharge device is a single and homogeneous molded product. As a result, it is possible to improve product quality without causing water leakage from the assembly boundary between each part, and to make the appearance of the entire water discharge device uniform and uniform. Can be good. on the other hand,
Only one mold is required to mold the water discharge device, and there is no need for assembly work between parts, such as when there are multiple components, and dimensional accuracy between the parts where each part is assembled. Since it is not necessary to secure the production cost, it is possible to improve the production efficiency and reduce the product cost.

According to a second aspect of the present invention, there is provided a method for manufacturing a water discharge device, wherein a space-like cavity extending in a predetermined direction, a gas inlet communicating with one end of the cavity in the extending direction, and an extending direction of the cavity. Using a mold having a predetermined space-like gas blowing portion that communicates with the other end, in the resin injecting step, the molten synthetic resin is injected into the cavity, and in the gas injecting step, the gas injecting port of the die is used. A gas is injected into the molten synthetic resin from the inside of the cavity, and the molten synthetic resin is pressed against the cavity surface from the inside by gas pressure to hold the molten synthetic resin in a shape corresponding to the cavity shape. A water supply passage is formed in the molten synthetic resin, the water supply passage extending from the gas inlet to the gas outlet, and is cooled and solidified in the cutting step. Said gas injection port side and the gas outlet side of the resin by cutting is to open the extending direction ends of the water supply passage.

In the resin injection step, it is possible to inject the molten synthetic resin into the cavity in a full shot and then inject the molten synthetic resin into the gas blowing portion by gas pressure. Therefore, the molten synthetic resin injected into the cavity in the resin injecting step forms a space inside and expands outward due to the gas pressure injected into the cavity in the gas injecting step, and is pressed against the cavity surface to form a cavity. It has the same outer shape as the shape. In the molten synthetic resin, a gas pressure causes gas to flow from the gas inlet to the gas outlet to form a water supply passage that communicates from the gas inlet to the gas outlet. Then, by cutting the gas inlet side and the gas outlet side of the synthetic resin that has been cooled and solidified in the cutting step, and opening both ends in the extending direction of the water supply passage, the water supply passage extends in a predetermined direction and opens at both ends in the extending direction. The tubular water discharger having the above is integrally molded from a predetermined synthetic resin. Therefore, by connecting the opening at one end of the water discharger to the water distribution pipe, water can be freely discharged from the opening at the other end. As a result, compared with the case where a plurality of parts are separately injection-molded, the molding can be performed with one mold, and the manufacturing process can be reduced and the production efficiency can be improved. In addition, it is not necessary to assemble each part as in the case of multiple components, and it is not necessary to secure dimensional accuracy between the parts where each part is assembled, thus improving production efficiency. Product cost can be reduced.

On the other hand, even when the water discharger has a complicated shape such as a multi-step curved shape, the gas from the gas inlet flows through the molten synthetic resin to the gas outlet along the extending direction of the cavity and melts. A water supply passage is formed in the synthetic resin as an internal space extending along the extending direction. As a result, even if the water discharger has a complicated shape, a tubular water discharger having a desired shape can be formed, the shape of the water discharger can be complicated, and the degree of freedom of shape is high. Further, since the water supply passage is formed inside the water discharger by the gas pressure, there is no need to use a slide mold which causes an increase in manufacturing cost, and the cost can be reduced. In addition, since the slide mold is not used, it is not necessary to provide a hole for removing the slide mold, and the work of shielding the hole with a separate member is not required, resulting in an increase in cost, a reduction in workability, and a reduction in appearance quality. There is also no risk of deterioration.

[Brief description of drawings]

FIG. 1 is a sectional view showing a water discharger according to a first embodiment of the present invention.

FIG. 2 is a rear view showing the water discharger of the first embodiment of the present invention.

FIG. 3 is a schematic process diagram showing a method of manufacturing a water discharger according to a first embodiment of the present invention, in which (a) shows a resin injection process,
(B) shows the middle of the gas injection process, and (c) shows the end of the gas injection process.

FIG. 4 is a sectional view showing a state in which a gas inlet and a gas outlet of the water discharger according to the first embodiment of the present invention are cut.

FIG. 5 is a sectional view showing a water discharger according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a water discharger of a third embodiment of the present invention.

FIG. 7 is a perspective view showing a state in which a water discharge device is attached to a low tank of a flush toilet.

FIG. 8 is a cross-sectional view showing a conventional water discharger.

FIG. 9 is a rear view showing a conventional water discharger.

[Explanation of symbols]

 2 Water distribution pipe 11 Connection part 12 Vertical part (guide part) 13 Inclined part (water supply part) 15 Water supply passage 21 Cavity 22 Gas inlet port 23 Gas blowout part 31 Connection part 32 Vertical part (guide part) 33 Inclined part (water supply) Part) 41 connection part 42 guide part 43 water supply part G gas R molten synthetic resin

Claims (2)

[Claims] 1. A tubular connecting portion made of synthetic resin, which is connectable to a water pipe and communicates with the water pipe, and a synthetic resin which extends to the connecting portion and is integrally formed with the connecting portion. A cylindrical guide part that communicates with the guide part, which is made of the synthetic resin and extends integrally with the guide part at a predetermined bending angle, is integrally molded, and communicates with the guide part. And a water discharge device. 2. A space-shaped cavity extending in a predetermined direction, a gas inlet communicating with one end of the cavity in the extending direction, and a space-like gas communicating with the other end of the cavity in the extending direction. A resin injection step of injecting a molten synthetic resin into the cavity of a mold having a blowout part, and injecting a gas into the molten synthetic resin inside the cavity from a gas injection port of the mold, and melting the gas by gas pressure. While holding the synthetic resin in a shape corresponding to the cavity shape by pressing the synthetic resin into the cavity from the inside, the synthetic resin is caused to flow into the gas blowing portion from the gas blowing port, and the synthetic resin is melted into the molten synthetic resin from the gas blowing port. A gas injection step of forming a water supply passage extending to the gas outlet, and cutting the gas inlet side and the gas outlet side of the cooled and solidified synthetic resin to extend the water supply passage in both directions. Method for producing a water discharge device, characterized by comprising a cutting step of releasing the.