JPS6135096Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a novel structure of a transparent plate used for the door of a refrigerating case.

A conventional transparent plate body used for the door of a refrigerating case has the structure shown in Fig. 2, in which two 3 mm thick transparent glass plates 7, 7 are separated by a spacer 6 filled with a desiccant 5 at a distance of about 6 mm. The glass plates 7, 7 and the spacer 6 are sealed with a filler 8 such as putty while maintaining the
After hardening and fixing, the periphery is reinforced with a frame 4 to form an integrated hollow plate.

This plate has a heat transmission coefficient of approximately 2.0 Kcal/hm ² °C, and has excellent heat and insulation properties, and has a hard surface that is resistant to scratches. Its disadvantages are that it is expensive and heavy, and it also has the problem that it is susceptible to shock and is easily damaged, both during transportation and after installation, and when it breaks, it poses a danger.

The present invention has been made to improve upon the drawbacks of such conventional plates, and aims to provide a structure that is easy to process, lightweight, and highly impact resistant.

Therefore, in order to achieve such an object, the present invention utilizes an integral molding method made of particularly transparent synthetic resin, and has a depth having six sides consisting of four circumferential surfaces extending between the front surface, the rear surface, and the peripheral edges of both surfaces, which are close to each other. A shallow hollow rectangular box is formed, with a window near one side of the front for introducing desiccant, and a sheet material made of a transparent, hard synthetic resin such as polycarbonate resin, which is resistant to tension and bending and has high impact resistance, is dried. After the agent has been introduced, the window is covered and pasted on one side of the front surface, and
The structure is such that the four peripheries of the front and rear surfaces and the four peripheral surfaces 1c are reinforced by fitting a frame body having a U-shaped cross section, and the airtightness of the hollow part is reliably maintained and the permeability is maintained. As a result, it has become possible to provide a plate that has excellent heat resistance and insulation properties, as well as sufficient resistance to mechanical shock.

Hereinafter, one example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an example of the plate body of the present invention, and numeral 1 indicates a hollow rectangular box with a shallow depth.

This hollow rectangular box is made of transparent synthetic resin such as acrylic resin, which is relatively inexpensive and versatile, and is integrally molded using blow, vacuum, or injection molding methods, with predetermined intervals of about 6 mm. The front surface 1a and the rear surface 1b are located close to each other and face each other.
It is formed into a hollow box body having six sides: and four circumferential surfaces 1c extending between the peripheries of both surfaces 1a and 1b.

A slit-shaped window 3 whose longitudinal direction is parallel to the lower side is formed on one side of the front surface 1a, for example, near the lower side, at the same time as the integral molding or by cutting after the molding.

Reference numeral 2 is a sheet material made of a transparent and hard synthetic resin, and the front surface 1a made of acrylic resin or the like has some problems with the mechanical strength of the surface and is particularly prone to scratches, so it is provided to reinforce it. However, it is important that the sheet material 2 is made of a resin that is strong in tension and bending and has high impact resistance, and polycarbonate resin is a suitable example.

For example, polycarbonate resin
By pasting a sheet material 2 with a thickness of 0.5 to 1 mm on one side of the front surface 1a to cover the window 3,
It is possible to simultaneously reinforce the front surface 1a and maintain airtightness within the hollow rectangular box 1.

In addition, before pasting the sheet material 2, a desiccant 5 is introduced through the window 3, and in order to make the sheet material 2 and the front surface 1a come into close contact with each other without even the slightest air bubbles, ultrasonic waves are applied. Adhesive means are preferred.

For the hollow rectangular box 1 with the sheet material 2 attached to the front surface 1a in this way, the front surface 1a,
By fitting the frame 4 having a U-shaped cross section to the four peripheries of the rear surface 1b and the four circumferential surfaces 1c, a plate whose periphery is reinforced by the frame-shaped frame 4 is formed.

It goes without saying that it is preferable to provide the window 3 in a position where it is hidden by the frame 4, as shown in the illustrated example, and by providing it further toward the lower side, it is possible to prevent the desiccant 5 from moving in a predetermined position. Stable fixation is possible, and this is also a preferred method.

As is clear from the above description, the present invention is lightweight because the transparent plate is formed by integral molding of synthetic resin, and the manufacturing cost is low because mass production is easy.

Furthermore, since the front surface 1a is reinforced by pasting a sheet material 2 with high impact resistance, it is less likely to be scratched, and even if it breaks, it will not be as dangerous as glass.

In addition, the hollow rectangular box 1 has a seamless integral structure, and the window 3 is reliably closed with the sheet material 2, so the airtightness of the hollow part inside the box is excellent, and moisture can not enter the front surface 1a. , there is also the advantage that there is little risk of clouding occurring on the rear surface 1b, and transparency can be ensured for a long period of time.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional structural diagram of one example of the plate body of the present invention, and FIG. 2 is a cross-sectional structural diagram of a conventional plate body. 1... Hollow square box, 1a... Front, 1b... Back, 1c... Four circumferential surfaces, 2... Sheet material, 3...
Window, 4...frame.

Claims (1)

[Scope of utility model registration request] By integrally molding the material from transparent synthetic resin,
A shallow hollow rectangular box 1 is formed with six sides, consisting of a front face 1a, a rear face 1b, which face each other closely, and four peripheral faces 1c extending between the peripheral edges of both faces 1a and 1b, and a desiccant is placed near one side of the front face 1a. A loading window 3 is provided, and a sheet material 2 made of a transparent and hard synthetic resin such as polycarbonate resin that is resistant to tension and bending and has high impact resistance is inserted into the window 3 after the desiccant 5 is loaded.
is attached to one surface of the front surface 1a, and the four peripheries of the front surface 1a, the rear surface 1b, and the four circumferential surfaces 1c... are reinforced by fitting a frame 4 having a U-shaped cross section. A plate for the case door.