JPS63204Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a metal thermos flask.

Recently, thermoses made of metal materials such as stainless steel have become popular as thermoses that do not break even when subjected to some shock.
When hot water is poured into a medium bottle, gas is generated from the medium bottle or outer bottle that forms the vacuum chamber, reducing the degree of vacuum in the vacuum chamber and reducing the insulation effect.
A gas adsorbent such as getter is sealed in the vacuum chamber to adsorb the generated gas and prevent the degree of vacuum from decreasing.

However, if a gas adsorbent is simply sealed in the vacuum chamber of a metal thermos flask, the gas adsorbent will move inside the vacuum chamber every time the thermos is moved, making noise, giving users suspicions that the product is defective. Because of the concern that gas adsorption may occur, attempts have been made to attach the gas adsorbent to the inside of the outer bottle of the thermos flask or to the sealing plate. In metal thermos flasks, at the same time as in glass thermos flasks, the inner surface of the vacuum chamber is plated with silver to reflect radiant heat and increase the insulation effect, but gas adsorbent is coated on the inner surface of the outer bottle. When locking, the inner and outer bottles that have been silver-plated and locked must be welded, which increases the degree of damage to the silver-plated surface during welding, leading to a decrease in the thermos' insulation performance. It's hard to avoid that. Attempts have also been made to avoid the above-mentioned difficulties by welding together the inner bottle and the outer bottle with an opening at the bottom, then silver-plating the inside, and attaching a gas adsorbent to the sealing plate welded to the opening. However, this was done by placing a holding member in the form of a hat with a hole on top of the gas adsorbent and fixing it, so the sealing plate with this holding member attached was attached to a thermos bottle. In order to weld to the bottom, it is necessary to provide a hole in the bottom of the outer bottle that is large enough to accommodate the edge of the presser member. This inevitably requires a certain size, and in the manufacturing process of thermos bottles, it not only becomes a bottleneck for reducing the welding area and lowering manufacturing costs, but also the area of the welding part is large. However, it is highly desirable to minimize the area of the welded area by making the sealing plate smaller, as this increases the chances of leakage due to pinholes in the welded area. The reality is that this technical problem has remained unsolved until now, as it is unavoidable that it requires a certain amount of size.

The inventors of this invention have been studying for many years to improve the performance of metal thermos flasks, and as a result of various experiments and studies regarding the problem of locking the gas adsorbent,
This led us to the present invention.

The present invention provides a metal thermos flask in which an inner metal bottle, an outer metal bottle, and a sealing plate are welded together, and a vacuum chamber is formed between them.
When a metal locking member having a plurality of locking pawl pieces is used to lock a gas adsorbent, the area of the locking member in contact with the sealing plate is substantially extended to the outer periphery of the gas adsorbent. A metal locking member whose dimensions do not exceed the thickness of Concerning thermos flasks.

The main body of the metal thermos flask of the present invention may be made of stainless steel, Cypronickel, or other various metal materials; the present invention applies to thermos flasks made of any metal material. The most common one is a stainless steel thermos flask, although other types may also be applicable.

The metal thermos flask of the present invention will be explained in detail using figures showing embodiments.

Embodiment 1 of the metal (stainless steel) thermos flask according to the present invention is shown in FIGS. 1 to 4. FIG. 1 shows a plan view of a metal (stainless steel) locking member 2 having four locking claw pieces 3, and FIG. 2 shows a metal locking member 2 on a sealing plate 1 of a thermos flask. A sketch of an example in which a disk-shaped getter 4, which is a gas adsorbent, is placed on the locking member by point welding, and the getter 4 is locked by bending the four restraining claw pieces 3 of the locking member 2 is shown in FIG. 3
The figure shows a longitudinal sectional front view of an example of a metal thermos flask in which the sealing plate shown in FIG. 2 is welded to the bottom 7 of the outer bottle 6. 5 is a medium bottle.

In FIG. 4, a metal locking member 2 similar to that in Example 1 is used as Example 2, but the locking claw piece 2 is
A front view of the sealing plate is shown when the sealing plate is bent twice and locked.

5 to 7 show a third embodiment in which the three stopper claws 3 of the stopper member 2, which has a substantially equilateral triangle shape in plan view, are each bent twice to hold the gas adsorbent 4. Indicated. FIG. 5 is a plan view of the locking member 2, FIG. 6 is a sketch when the gas adsorbent 4 is locked on the bottom plate 1 by bending the stopper claw 3 of the locking member 2 twice, and FIG. 7 is a plan view of the locking member 2. FIG. 6 is a front view of the case shown in FIG. 6;

8 is a front view of the sealing plate of Example 4 in which the stopper claw piece 3 in Example 3 is bent once to retain the adsorbent 4.
Shown in the figure.

FIG. 9 shows a locking member 2 having two locking claw pieces.
10 and 11 show the gas adsorbent 4 being locked onto the sealing plate 1 by bending the locking claw piece 3 once or twice, respectively, using this locking member. The sketches of Example 5 and Example 6 are shown.

FIG. 12 shows a plan view of the locking member 2 having one pointed stopper claw piece 3, and FIGS. 13 and 14 show a plan view of the locking member 2 that uses this locking member to lock the gas adsorbent The sketches of Example 7 and Example 8 are shown. 1st
In Example 7 shown in Fig. 3, the tip of the stopper claw piece is inserted into a hole provided in the center of the gas adsorbent to lock it, and in Example 8 shown in Fig. 14, the gas adsorbent is inserted from the outside. It is held in place by a restraining claw piece. In Example 8, holes were made near the edge of the gas adsorbent,
It is also possible to make a groove on the edge and insert the tip of the stopper claw into the groove.

FIG. 15 shows a plan view of the locking member 2 having the stopper claw piece 3 with a widened tip, and FIG. 16 shows the locking member 2 used to lock the gas adsorbent 4 onto the sealing plate 1. A sketch of Example 9 is shown.

FIG. 17 shows a plan view of the locking member 2 having a stopper claw piece 3 with a band-shaped tip, and FIG. A schematic diagram of Example 10 is shown. The band-shaped portion of the stopper claw piece is bent along the outer periphery of the gas adsorbent.

FIG. 19 shows a plan view of a locking member having four restraining pawls, and FIG. 20 shows this locking member with a second
The sample is placed in a gas adsorbent with a hole in the center as shown in Figure 1, and the stopper claw piece is placed in the hole and bent outward to lock it, as shown in the sketch. FIG. 22 shows a sketch of Example 11 in which the gas adsorbent was locked onto the sealing plate using this locking member. The locking member shown in FIG. 19 may be used as shown in FIGS. 2 and 3 by bending the locking claw piece 3 inward.

The locking member 2 having a ribbon-shaped stopper claw piece 3 whose plan view is shown in FIG. 23 is point-welded onto the sealing plate 1 as shown in a sketch in FIG. As shown in the sketch of No. 12, a ribbon-shaped stopper claw 3 was passed through the opening of the gas adsorbent having a hole in the center and bent to lock the gas adsorbent.

FIG. 26 is a plan view of the locking member 2 having two ribbon-shaped restraining claw pieces 3, and FIG. 27 shows a plan view of the locking member 2 having two ribbon-shaped restraining claw pieces 3, and FIG. A sketch of a locking member having two bent pawl pieces 3 standing upright in the center is shown. In Fig. 28, this locking member is point-welded to the sealing plate, the hole provided in the center of the gas adsorbent is fitted into the upright stopper claw piece 3, and the tip of the stopper claw piece is bent and locked. A sketch of Example 13 is shown. FIG. 29 is a sketch showing the shape of the restraining pawl piece when locking is performed. A gas adsorbent having holes may be similarly locked using a locking member having three or more ribbon-shaped locking claw pieces.

If a locking member such as the one shown in the plan view in Fig. 30 is used, it is possible to lock the gas adsorbent with a cap placed over it, as shown in the sketch of Example 14 in Fig. 31. can. FIG. 32 shows a sketch of the shape of the locking member and the restraining pawl in this case. In this case, the shape and number of the restraining claw pieces may be changed as appropriate.

As shown in these embodiments, the metal locking member must have at least one restraining claw piece, but the shape and number of the restraining claw pieces may be determined as appropriate. The examples are merely illustrative, and the scope of the present invention is not limited to the examples.

The metal material of the locking member is not particularly limited and may be used as long as it can be spot welded to the sealing plate at the bottom of the thermos bottle, but in general, it can be used with the body of the metal thermos bottle. It is safe to use metals of the same quality. For example, in the case of a stainless steel thermos flask, a locking member made of a stainless steel plate may be used for the sealing plate of the stainless steel plate.

As the gas adsorbent, a substance used as a known getter may be used in the shape of a disk, donut disk, or any other arbitrary shape, and the shape and dimensions of the locking member and the gas adsorbent should correspond well to each other. It should be designed with consideration given to this.

For spot welding the metal locking member and the sealing plate, a well-known spot welding method may be used, and a heat source such as electric current, high-frequency current, plasma, laser, etc. may be used as appropriate. No problem.

In order to lock the gas adsorbent, the method of bending the locking claw pieces of the metal locking member, the number of bending points, etc. can be changed as desired.

By using the simple components described above, the present invention allows the gas adsorbent to be reliably attached to the bottom of the metal thermos flask even if the sealing plate welded to the bottom of the flask is small, ensuring reliable airtightness and ensuring a good silver-plated surface. This makes it possible to make a metal thermos flask, which greatly contributes to improving the performance of metal thermos flasks, and the practical value of the present invention is extremely high.

[Brief explanation of the drawing]

Figure 1, Figure 5, Figure 9, Figure 12, Figure 15
17, 19, 23, 26, and 30 are plan views, FIG. 2, FIG. 6, FIG. 10, and FIG. 11
13, 14, 16, 18, 22, 25, 28, and 31 show that the locking member is used in the sealing plate of the metal thermos flask of the present invention. Schematic diagram of the example in which the gas adsorbent is locked by the 3rd
The figure is a longitudinal sectional front view of one embodiment of the thermos flask of the present invention, and Figures 4, 7, and 8 are examples of the thermos flask of the present invention in which a gas adsorbent is locked to the sealing plate using a locking member. FIGS. 20, 27, and 32 are sketches of examples of the locking member used in the present invention, and FIGS. 24 and 29 show the locking member on the sealing plate of the thermos flask of the present invention. Fig. 21 is a sketch of an example of a gas adsorbent used in a thermos flask of the present invention. 1... Metal thermos sealing plate, 2... Metal locking member, 3... Stopping claw piece, 4... Gas adsorbent, 5...
... Inner bottle of a metal thermos bottle, 6... Outer bottle of a metal thermos bottle, 7... Welded part at the bottom of the thermos bottle.

Claims (1)

[Scope of utility model registration request] At least one locking claw that can be bent to hold a gas adsorbent in a metal thermos flask in which a metal inner bottle, outer bottle, and sealing plate are welded together to create a vacuum chamber between them. When a metal locking member having a piece is used for locking a gas adsorbent, the area of the locking member in contact with the sealing plate is substantially the outer circumference of the gas adsorbent plus the thickness of the locking member. A metal thermos flask comprising a sealing plate in which a metal locking member having a size that does not exceed the specified range is preliminarily dot-welded onto the sealing plate, and a gas adsorbent is locked with a stopper claw of the locking member.