JPS6037070Y2 - Double-ended vacuum double bottle - Google Patents

Description

[Detailed Description of the Invention] (Field of the Invention) The present invention relates to an improvement of a double-breasted vacuum bottle having openings at the upper and lower parts.

(Prior Art) Recently, there has been a demand for thermos flasks that can heat and keep warm at once by incorporating a heating element such as a heater inside the vacuum double bottle, or for thermos flasks that can be fitted with a collar.

However, a double-layer vacuum bottle that has a spout only on the top cannot meet the above requirements, and a double-layer vacuum bottle that also has a spout on the bottom has been developed.

Generally, thermos flasks are kept warm by filling them with extremely hot or cold liquids such as boiling water or ice water, but when such extremely hot or cold liquids are placed inside the flask, the inner bottle expands and contracts under the influence.

A vacuum double layer with an opening only at the top is less prone to thermal shock damage due to expansion and contraction of the inner bottle, but a vacuum double layer with both eyes and an opening at the bottom is less susceptible to thermal shock damage due to expansion and contraction of the inner bottle due to heat. Easy to occur.

(Purpose of the invention) The present invention is to provide a vacuum double layer with both eyes that completely absorbs the expansion and contraction caused by the heat of the inner bottle by using the inner wall of the lower mouth part and eliminates damage caused by heat. .

(Structure of the Invention) The dual-eye vacuum double layer of the present invention is characterized in that the inner wall of the lower opening of the vacuum double layer having upper and lower openings is expanded downward or upward into a substantially trumpet shape.

(Example) Fig. 1 shows a two-day vacuum double bottle 1 according to the present invention, which has an upper mouth part 2 and a lower mouth part 3, and the bottle body has an inner bottle 1a and an outer bottle 1.
b are connected at the upper and lower openings 2 and 3, a space 4 is formed with an appropriate interval between the two layers, and an exhaust pipe 5 is provided at the bottom of the outer bottle 1b.
From there, the air in the space 4 is evacuated to create a vacuum inside.

Reference numeral 6 denotes a heat-insulating spacing material that maintains the spacing between the inner and outer layers 1a and lb, and usually uses asbestos.

A trumpet-shaped thermal expansion/contraction absorption tube 7 of the inner bottle 1a, which expands downward in a trumpet shape and forms the inner wall of the lower mouth part 3, is connected to the center of the bottom of the inner bottle 1a, and the lower end is connected to the outer bottle 1b. It is integrally connected to the protrusion 8 at the center of the bottom.

The heat-expandable absorption tube 7 may be connected to the inner bottle 1a with the trumpet-shaped wide mouth facing upward and the narrow mouth facing downward.

Next, the manufacturing method will be explained step by step with reference to FIG.

First, in the inner bottle forming step, an inner bottle 1a as shown in FIG.

Thereafter, as in step B, the central position of the inner bottle bottom 10 is heated with a gas burner or the like to melt the glass, and at the same time, the narrow part of the approximately trumpet-shaped thermal expansion/contraction absorption tube 7 is also heated and melted to connect.

The heated bottom part 10 of the inner bottle melts like starch syrup and has a hole, and the narrow part of the approximately trumpet-shaped heat expansion/contraction absorption tube 7 also melts, so that the bottom part of the inner bottle 1a has an approximately trumpet-shaped inner bottle heat. The expandable absorption tube 7 is integrally welded as shown in Figure C.

The process of forming the outer bottle 1b into which the inner bottle 1a is inserted is shown in Figure A.
A protrusion 8 for inserting the heat-expandable absorption tube 7 forming the inner wall of the lower mouth portion of the inner bottle 1a is previously formed at the center of the bottom as shown in FIG. 1 and then blow molded.

Next, as shown in FIG. B', the bottom 11 of the outer bottle 1b is heated and melted using a gas burner or the like to make a hole, and the exhaust pipe 5 is also heated and melted to be welded.

Thereafter, as in step C, the upper shoulder of the body and the lower end of the protrusion 8 are cut to form an outer bottle 1b into which the inner bottle 1a is inserted.

The inner bottle 1a formed in the above process is inserted into the outer bottle 1b thus formed through the upper opening 12 as shown in the figure, with asbestos 6 interposed in the bottom, and the inner and outer bottles are set.

After setting the inner bottle 1a inside the outer bottle 1b, the upper edge 1 of the outer bottle
3 with a gas burner, and then heat roller 1 as shown in Figure E.
4, it is curved to follow the shape of the shoulder of the inner bottle, and the periphery of the lower protrusion 8 is also heated and melted with a gas burner.

The upper bottle mouth part is heated and melted when forming the outer bottle shoulder part, and the lower opening part 3 is also melted with a gas burner, so the heated mouth molds 15 and 15 that match the upper and lower mouth parts 2 and 3 are pressed respectively. The inner and outer mouths of the bottle are connected together and constructed in one piece.

When the heat-formed double layer is cooled to room temperature, deformation or strain may occur in the glass due to internal stress or external force, and breakage occurs when the strain becomes greater than the strength of the glass during use. There is a fear.

In order to eliminate such a risk, the double layer from which the mouth mold 15.15 has been removed is placed in a slow cooling oven and gradually cooled over a certain period of time to perform a slow cooling operation to prevent the occurrence of distortion.

After the double layer that has been slowly cooled is coated with silver, the exhaust pipe 5 is
The air in the space 4 of the inner and outer bottles is evacuated, the space 4 is evacuated, and the lower end of the exhaust pipe 5 is heated and melted to close it.

The two-day vacuum double layer of the present invention is manufactured through the above steps.

(Effect of the invention) The two-day vacuum double layer of the present invention has the inner wall surface of the lower mouth part 3 enlarged into a roughly trumpet shape, so that when hot water is poured into the bottle or ice is poured into the bottle, the inner bottle suddenly expands and contracts. Even if the inner bottle is heated, the trumpet-shaped trumpet tube acts as a buffer and protects the inner bottle from thermal shock.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the vacuum double layer according to the present invention, and FIG. 2 is a schematic explanatory diagram showing the manufacturing process of the double vacuum double layer according to the present invention. 1...Both vacuum double layer, 1a...Inner bottle, 1b...Outer bottle, 2...Upper opening, 3
・・・Lower mouth part, 4... Space part, 5...
...Exhaust pipe, 6...Asbestos, 7...
Trumpet tube, buttock...Protruding part of the outer bottle.

Claims (1)

[Scope of utility model registration request] A two-day vacuum double bottle characterized in that the inner wall of the lower mouth part of the vacuum double layer having upper and lower mouth parts is expanded downward or upward into a substantially trumpet shape.