JPH0314111Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The invention relates to a metal thermos flask, and more specifically, an opening for vacuuming is provided at the bottom of a metal outer bottle. This invention relates to an improvement of a metal thermos flask in which closure is achieved by a lid member brazed to the bottom of the outer bottle, and the brazed portion of the lid member is covered by a synthetic resin bottom plate. .

``Prior Art'' Figures 6 to 8 show conventional examples of metal thermos flasks of the type described above. The top is equipped with a cap 2 that also serves as an exterior. and,
A small inner stopper 4 and a large inner stopper 5 are accommodated between the inner stopper 3 that closes the mouth of the bottle body 1 and the above-mentioned stopper 2.

The bottle body 1 includes a metal inner bottle 6 and a metal inner bottle 6.
The outer bottle 7 and the inner bottle 6 are integrated with each other by joining their upper ends to each other. Further, at the bottom of the outer bottle 7, as shown in FIG. 9 is provided, and this opening 9 is closed by a lid member 10 that is brazed to the bottom of the outer bottle 7 after the evacuation operation. The bottom plate 12 made of synthetic resin protects the brazed portion 11 of the lid member 10 from impact and hides the brazed portion 11 to improve the external decoration. It is attached to the lower end surface of the outer bottle 7 so as to cover it.

Further, a portable handle 13 is provided at a suitable location on the outer periphery of the outer bottle 7.

``Problems to be solved by the invention'' At this point, in the conventional device described above, an air pocket is formed in the sealed space 14 between the bottom of the outer bottle 7 and the bottom plate 12, and the temperature of the outside increases. The bottom plate 12 was deformed due to repeated thermal expansion and contraction of the air that entered the space 14 as it was raised and lowered, resulting in some products being defective.

As a countermeasure against such inconvenience, the bottom plate 1
It is conceivable to increase the strength of the bottom plate 12 by increasing the thickness of the bottom plate 2, and to increase the bonding strength of the bottom plate 12 to the bottom of the outer bottle 7. but,
On the other hand, such a measure requires a large amount of material for the bottom plate 12, which not only increases cost but also causes a new problem of increased weight.

This idea was made in view of the above circumstances,
This not only prevents the deformation of the bottom plate due to thermal expansion and contraction of the air in the bottom space and reduces the defective rate due to deformation of the bottom plate, but also reduces costs and weight by saving the material of the bottom plate. The purpose is to provide a metal thermos flask that can be used.

"Means for Solving the Problems" The metal thermos flask according to this invention has a double structure in which the bottle body has a metal inner bottle and a metal outer bottle that accommodates the inner bottle, and A vacuum opening is provided at the bottom of the outer bottle to create a vacuum insulation layer between the inner bottle and the outer bottle, and this opening is closed after the vacuum operation. This is achieved by a lid member brazed to the bottom of the outer bottle, and a synthetic resin bottom plate that covers the brazed part of the lid member is attached to the lower end of the outer bottle, and the bottom plate is attached to the center of the outer bottle. It is characterized by being ring-shaped with a hole in it.

"Function" In the thermos according to this invention, the bottom plate that covers the brazed portion of the lid member is ring-shaped, and most of the space formed between the lid member and the bottom plate is formed through the hole in the center of the bottom plate. Since the structure is such that air is released to the atmosphere through the space, air accumulation in the space is reduced, and deformation of the bottom plate due to thermal expansion and contraction of air is prevented.
Therefore, the defect rate due to deformation of the bottom plate can be reduced.

Moreover, the material of the bottom plate can be saved by the hole provided in the center of the bottom plate, and this material saving can also reduce costs and weight.

In addition, in the case of this type of thermos bottle, the appearance of the bottom can be improved by making the holes in the bottom plate have various shapes such as circular, oval, and polygonal
You can devise ways to diversify your design.

Therefore, this has an extremely large impact on the product value.

Embodiment FIGS. 1 to 3 show side views of an embodiment of the present invention, and reference numeral 20 in the figures is the bottle body.

This bottle body 20 has a double structure consisting of a metal inner bottle 21 and a metal outer bottle 22 that accommodates the inner bottle 21, and the inner bottle 21 and the outer bottle 22 have their own respective parts. They are integrated by airtightly joining the upper ends to each other, and a lip rubber 23 is attached to the upper edge formed by this joining so as to cover both sides of the edge. A shoulder member 24 having a threaded portion 24a is attached. The upper end opening of this bottle body 20 is closed by an inner stopper 25, and a stopper 26 is attached to cover the outside thereof. This tip 26 is locked by being screwed into the threaded portion 24a of the shoulder member 24.

At the center of the bottom of the outer bottle 22, as shown in FIG. 2, a circular recess 22a is formed, which is recessed inward. A vacuum opening 29 is provided to make the space 28 between the two parts a vacuum heat insulating layer. Further, a groove 22b is formed on the outer periphery of the recessed portion 22a substantially concentrically therewith.

The opening 29 is closed by a lid member 30 that is brazed to the recess 22a in a vacuum heating furnace after evacuation. The recess 22a
The depth is set to be greater than the plate thickness of the lid member 30, so that the lid member 30 is located inside the lower end surface 22c of the bottom of the outer bottle 22.

Further, as shown in FIG. 3, a bottom plate 32 made of synthetic resin is attached to the lower end surface 22c.

The bottom plate 32 has a ring shape with a hole 32a in the center, and has a protrusion 32b that fits into the groove 22c at a position corresponding to the groove 22c. Possibly positioning (centering) the outer bottle 22 at the bottom.
It is fixed to the lower end surface 22c of the outer bottle 22 by the fitting force between the protrusion 32b and the groove 22c and the bonding force by an appropriate means such as an adhesive.

One of the purposes of this bottom plate 32 is to protect the brazed portion 33 of the lid member 30 from impact, and to increase the design effect of hiding the brazing portion 33 and improving the appearance. On the inner circumferential side, the brazing portion 3 extends toward the lid member 30 side.
An inner edge portion 32c that covers 3 is formed. Also,
The lower end surface 32d of this bottom plate 32 is located below the lower end surface 22c of the outer bottle 22, and when it is placed upright on a table or the like, the lower end surface 32d of this bottom plate 32 is the actual ground surface. becomes. In this way, when the synthetic resin bottom plate 32 is placed in contact with the ground when placed upright, the feel when placed is better than when the metal outer bottle 22 is in direct contact with the earth. This is also effective in preventing damage to the outer bottle 22 when dropped.

In the above embodiment, the outer periphery of the bottom plate 32 is circular, and the hole 32a provided in the center is also circular, but the shape of the bottom plate 32 is not limited to the above embodiment.

For example, as shown in FIG. 4, the outer periphery of the bottom plate 32 is made oval and the holes 32a are made circular, or as shown in FIG. 5, the outer periphery is made circular and the holes 32a are made hexagonal. It is also possible to take any other shape. However, from the point of view of saving materials, etc., it is advantageous to match the shapes of the inner and outer circumferences of the bottom plate 32.

Further, as means for attaching the bottom plate 32 to the lower end surface of the outer bottle 22, in addition to bonding with an adhesive, fitting using the elastic force of the outer plate or connection using screws can be considered.

In the thermos bottle as described above, the bottom plate 32 that covers the brazed portion 33 of the lid member 30 has a ring shape, and there are a large space 34, small spaces 35, 36, etc. between the lid member 30 and the bottom plate 32. However, the space 34 that occupies most of the space is opened to the atmosphere through the hole 32a in the center of the bottom plate 32, and the sealed spaces 35 and 36 where air accumulates become extremely small. Deformation of the bottom plate 32 due to thermal expansion or contraction is prevented.

In fact, a thermal cycle test from -40°C to +80°C was conducted, and no deformation of the bottom plate 32 occurred in this test.

Therefore, the rate of defects due to deformation of the bottom plate 32 can be reduced.

Moreover, the material of the bottom plate 32 can be reduced by the amount of the hole 32a provided in the center of the bottom plate 32, and this material saving can also reduce costs and weight.

In one example, the weight of the parts could be reduced by about 25%.

In addition, in the case of such a type of thermos flask, the bottom part is exposed to the outside when it is carried around.
Therefore, the appearance of the bottom also has an influence on the product value, and efforts are required to improve the appearance of the bottom and diversify the design. However, in the thermos according to this invention, the central part of the bottom plate 32 is simply By changing the shape of the hole 32a, the appearance can be varied and various designs can be easily obtained.

Further, by providing the hole 32a in the center of the bottom plate 32, the bottom plate 32 can be given appropriate flexibility, and compared to the conventional simple disk-shaped one, the lower end surface 32d of the outer bottle 22 Even if there is slight warpage or distortion, it can be easily and reliably brought into close contact with the lower end surface 32d, and sufficient adhesive strength can be obtained.

"Effect of the invention" As is clear from the above explanation, the metal thermos flask of the invention has a vacuum opening provided at the bottom of the outer bottle that is brazed to the bottom of the outer bottle in a vacuum environment. It is closed with a lid member, and the brazed part of this lid member is covered with a synthetic resin bottom plate, and the bottom plate is in the shape of a ring with a hole in the center, and is formed between the lid member and the bottom plate. Since most of the space is exposed to the atmosphere through the hole in the center of the bottom plate, air pockets in the space are reduced, and deformation of the bottom plate due to thermal expansion of air is prevented. Therefore, the defect rate due to deformation of the bottom plate can be reduced.

Moreover, the material of the bottom plate can be saved by the hole provided in the center of the bottom plate, and this material saving can also reduce costs and weight.

In addition, in the case of such a type of thermos flask, the bottom part is exposed to the outside when it is carried around.
Therefore, the appearance of the bottom also has an influence on the product value, and efforts are required to improve the appearance of the bottom and diversify the design.However, in the thermos according to this invention, the hole in the center of the bottom plate is simply By changing the shape, the appearance can be varied and a variety of designs can be easily obtained.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention. Figure 1 is a partially sectional side view, Figure 2 is an enlarged view of the main part of Figure 1, and Figure 3 is an enlarged view of the main part of Figure 1. Fig. 1 is a bottom view of the thermos flask shown in Fig. 4, Fig. 4 is a bottom view of another embodiment of the present invention, Fig. 5 is a bottom view of still another embodiment of the present invention, and Fig. 6 is a conventional thermos flask. 7 is an enlarged view of the main part of FIG. 6, and FIG. 8 is a bottom view of the thermos flask shown in FIG. 6. 20...bottle body, 21...inner bottle, 22...outer bottle, 22a...recess, 22b...groove, 22c...
Lower end surface, 28... space, 29... opening, 30...
...Lid member, 32... Bottom plate, 32a... Hole, 32c
...Inner edge part, 33...Brazing part, 34.35.
36...Space.

Claims (1)

[Scope of utility model registration request] The bottle body has a double structure consisting of a metal inner bottle and a metal outer bottle that houses the inner bottle, and
A vacuum opening is provided at the bottom of the outer bottle to create a vacuum insulation layer between the inner bottle and the outer bottle, and this opening is closed after the vacuum operation. A metal thermos flask having a lid member brazed to the bottom of the outer bottle, and a synthetic resin bottom plate covering the brazed portion of the lid member attached to the lower end surface of the outer bottle, A metal thermos flask characterized in that the bottom plate is ring-shaped with a hole in the center.