JP2757219B2 - Planar heating system heating toilet seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a resin product having a built-in planar heating element, which is provided with a heating toilet seat, a hot water tank, and a heater for preventing light oil freezing. Used for in-vehicle fuel tanks.

(Prior Art) As a prior art relating to the present invention, there is a gazette of Japanese Patent Publication No. 62-58248.

As shown in the cross-sectional view of the seating portion in FIG. 6, the heating toilet seat has a heating element 11 made of a composite material obtained by mixing a synthetic resin with a conductive material. This is a heating toilet seat in which electrodes are embedded in a heating element.

However, the heating toilet seat has the following features. (1) The thickness of the seat surface of the toilet seat is made thinner than the thickness of the rear surface, so that heat radiation from the seating side is made larger than that of the rear surface, and the thermal efficiency is improved. When compared with the structure including, the thermal efficiency is inferior and the power consumption increases.

(2) Since the thickness of the back surface cannot be increased, there is a limitation in design and a high-quality toilet seat cannot be provided.

(3) Increasing the thickness of the back surface causes problems such as sink marks and a decrease in operability of opening and closing the toilet seat due to an increase in weight, a decrease in opening and closing durability due to an increase in load on the hinge portion, and an increase in cost due to an increase in material costs. I got a point.

For this reason, the applicant has filed Japanese Patent Application No. 1-170971 (Japanese Unexamined Patent Application Publication No.
No. 1), a foamed resin molded article 13 or a hollow molded part 14 is arranged on the back side opposite to the seating surface of the sheet heating element to release gas, as shown in FIGS. An application for a heating toilet seat having a structure including a part including the same.

This method of manufacturing a heating toilet seat is effective when all parts are sequentially placed in a mold and molded. However, since the appearance of a foamed resin molded product is poor, a foamed resin is coated on the outside to improve the appearance. A part 15 to be formed is required, the number of molded parts increases by one, the cost increases, and it is difficult to obtain a hollow molded product with a normal injection molding machine. There is a problem that it is necessary.

In the molding of a synthetic resin heating toilet seat, the present invention inserts a sheet heating element and other electric components into a mold when molding a resin portion on the seat surface side, and inserts the rear surface side and the seat surface side. When the synthetic resin is welded and integrated, a technical object is to provide a heating toilet seat which has a space portion of a fixed volume on the side of the heating element on the back side and can be molded by a usual injection molding machine.

[Configuration of the invention]

(Means for solving the problem) The technical measures taken to solve the problem are as follows. That is, in a heating toilet seat having a sheet heating element formed by injection molding of a conductive heat generating material inside, and being integrated with a synthetic resin, a synthetic resin that covers the seat surface side is injection-molded. At the time, after the sheet heating element, the synthetic resin portion covering the opposite side to the seating surface of the sheet heating element, other electric components, etc. are arranged in a mold, injection molding is performed, and heat during molding at that time is used. In a heating toilet seat that is molded by being integrated by pressure, it is integrated by providing ribs, grooves, holes, etc. on the side of the synthetic resin part that covers the opposite side of the seat surface with the planar heating element. This is a heating toilet seat having a space containing gas on the side opposite to the seating surface of the rear heating element.

(Operation) A space is formed by providing a rib, a groove, a hole, and the like on the side of the synthetic resin portion that covers the opposite side of the seat surface of the heating toilet seat, in contact with the planar heating element. The weight can be reduced by the volume, and the synthetic resin material can be saved, so that a durable and reliable heating seat with a planar heating system can be manufactured.

Example An example will be described below.

Example 1 In FIG. 1, 1 is a sheet-like heating element made of a conductive material and a synthetic resin, which is formed by injection molding, 2 is an electrode, and 3 is a cord.

The sheet heating element 1 was made into a pellet by mixing 28 wt% of 6-4 brass short fiber φ90 μm × 13 mm (manufactured by Aisin Seiki Co., Ltd.) with ABS resin Y511D (manufactured by Ube Sycon Co., Ltd.) containing 10 wt% of carbon black. What was used was used. At this time, the electrode fitting with a cord was insert-molded.

Next, as shown in FIG. 2, a natural rubber sheet of t = 0.5 mm was punched out, covered with a sheet 5, and stopped with a double-sided tape.
The heating element 4 having a heavy insulating structure was formed.

Next, as shown in FIG. 3, the synthetic resin portion 6 on the backside was injection-molded using ABS resin GM-1K Misty Ivory manufactured by Mitsubishi Rayon Co., Ltd. On the side in contact with the planar heating portion, grid-like ribs 7a7b shown in FIG.
・ Many are provided.

The dimensional intervals of the ribs 7a7b... Are formed in a fine lattice shape so that when the surface covering resin portion of the seat surface is molded in the final stage, the heat generating portion molded body is not broken by the resin pressure at the time of molding. The synthetic resin portion on the back surface has a groove 8 for fitting a thermosensor and a groove for fitting a cord of a heat generating portion, as shown in FIG. Instead of the ribs 7a7b..., Grooves or holes may be used.

Next, as shown in FIG. 4, the backside synthetic resin portion, the sheet heating element 4 coated with the insulating material, and the thermosensor are temporarily assembled as shown in FIG. , And the surface-encapsulated synthetic resin portion 9 shown in FIG.
A heating toilet seat 10 having a sheet heating element having a double insulating structure inside and being integrally covered with a synthetic resin was completed.

The total weight of this heating toilet seat 10 is relatively light at 1280 g, and the power consumption for maintaining the seat surface temperature at 35 ° C in a windless room where the outside air temperature is controlled at 5 ° C is
It was 575 wh / day, and no abnormalities were seen in the appearance and operation even after the toilet seat was opened and closed for 60,000 times.

Comparative Example 1 A back package having a shape shown in FIG. 9 in which ribs 7a7b... For creating a space portion of the back cover synthetic resin portion in FIG. Synthetic resin No. 16 was prepared using the same ABS resin material as used in Example 1, and this was used instead of the one shown in FIG. The heating toilet seat, which was temporarily assembled and molded and integrated with the surface-encapsulated synthetic resin part 9, had a total weight of 2080 g and had a problem with opening and closing operability due to its heavy weight. At 23,400 times, it was found that cracks entered the hinge and lacked durability.

This heating toilet seat is 5 ° C outside air, and the surface temperature of the seat surface in a windless room
In order to maintain the temperature at 35 ° C., power of 690 wh / day was required, and it was found that the power consumption was increased by about 20% as compared with Example 1 of the product of the present invention.

COMPARATIVE EXAMPLE 2 A heating toilet seat having substantially the same appearance as that of Example 1 and having a structure including a foam molded body 13 therein as shown in FIG. The foamed resin part 13 separately molded, the separately molded backside normal resin molded part and the electric circuit are temporarily assembled, and the front wrapped synthetic resin part 12 is molded and integrated to form a heating toilet seat, Although there is no significant difference in weight and power consumption from the present invention, the number of molded parts increases by one point, and the total cost increases by about 20%.

(Effects of the Invention) The present invention has the following effects. That is, (1) power consumption can be reduced because of the backside heat insulating effect.

(2) Since the thickness of the resin portion on the back surface can be freely set, the degree of freedom in design is increased, and a high-quality toilet seat can be obtained.

(3) Material cost can be reduced, toilet seat opening / closing operability can be improved, and toilet seat opening / closing durability can be improved by weight reduction.

(4) A back molded product for appearance cosmetics is not required as compared with the case where the back is molded by foam molding, and the cost is reduced.

(5) A special injection molding machine can be manufactured without the need for a special injection molding machine, as compared with the case where the back surface is formed by injection molding.

[Brief description of the drawings]

FIG. 1 (a) is a plan view of a sheet heating element, and FIG. 1 (b) is (a).
2A is a cross-sectional view, FIG. 2A is a plan view of a sheet heating element sealed with rubber, FIG. 2B is a BB cross-sectional view of FIG.
3A is an explanatory plan view of the backside wrapped synthetic resin portion, FIG. 3B is a cross-sectional view taken along line C-C of FIG. 3A, and FIG. Plan view with body temporarily assembled,
5B is a cross-sectional view taken along line D-D of FIG. 5A, FIG. 5A is a plan view of this embodiment, FIG. 5B is a cross-sectional view taken along line E-E of FIG. FIG. 9 is a sectional view of a conventional heating toilet seat, and FIG. 9 is a sectional view of a comparative example. 1,4 ... sheet heating element, 2 ... electrode, 6 ... synthetic resin part on back,
7a, 7b …… Rib, 10 …… Planar heating type heating toilet seat

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A47K 13/30

Claims (1)

(57) [Claims] When a synthetic resin for covering a seat surface side of a heating toilet seat having a sheet heating element therein is molded, the sheet heating element, and a side opposite to the seat surface of the sheet heating element are covered. Injection molding after placing synthetic resin and other electric parts in the mold, and integrating by heat and pressure at the time of molding at the time. In the heating toilet seat, the side opposite to the seat surface is covered. A rib on the side of the synthetic resin portion on the back side that contacts the planar heating element,
A planar heating type heating toilet seat having a space containing gas on the side opposite to the seating surface of the integrated rear heating element by providing a groove or the like.