JPS5839647Y2 - thermal container - Google Patents

Description

[Detailed description of the invention] This invention is related to heat-insulating containers such as thermos flasks that utilize air pressure, and its purpose is to construct a bellows used in a mechanism that compresses air by integral molding of resin. This simplifies the production of the air compression mechanism, thereby providing a heat insulating container at a low price.

In conventional thermal containers of this type, the air compression mechanism was assembled by welding the bellows part to the top or bottom plate.
This would make the assembly work extremely troublesome, and there was a risk of air leakage from the welded parts due to aging or poor processing.

Furthermore, although it has been acknowledged that it is necessary to construct the bellows by integral molding of resin, its practical application has been hindered because it has been impossible to insert a coil spring inside the bellows.

Therefore, this invention is intended to solve the above-mentioned problems.

Hereinafter, the configuration of this invention will be explained according to the drawings shown as examples.

First, as shown in FIG. 1, the head 1 of this heat insulating container has side and upper edges formed by a lid exterior 2, an intake valve 3 in the center of the upper surface, and an intake valve 3 and the lid exterior. A push plate 4 is provided between the two.

Furthermore, a bellows 6 having a bellows 5 on its side surface is disposed in the internal space of the head 1, and this bellows 6 has a vent hole 7 formed in the center of its bottom surface at the outer periphery thereof, and a bellows 6 that is parallel to the bottom plate 8 of the head 1. By fitting the packing seals 9 fixed to each other,
It is fixed to the bottom plate 8.

Further, the push plate 4 is placed on the upper surface of the bellows 6, and the edge of the first part 10 between the upper surfaces of the bellows 6 is bent upward to form an insertion portion 11, and the back surface of the push plate 4 is This insertion portion 11 is inserted into the formed annular groove 12 to support the push plate 4.

Next, a −L side opening 1 is placed in the center of the bottom surface of the bellows 6.
A coil spring 14 whose diameter gradually decreases upward is formed by forming four parts 13 that are one step lower and have a diameter smaller than 0, and a coil spring 14 whose diameter gradually decreases upward is provided, and the tip of this coil spring 14 is an annular groove formed on the back surface of the intake valve 3. 15 to support the intake valve 3.

Further, a claw 17 that projects outward is formed at the lower end of the protruding edge 16 forming the annular groove 15, and the claw 17 is engaged with and supported by the back surface of the inner edge of the push plate 4. There is.

Furthermore, a plurality of air circulation holes 18 are formed at the outer base of the protruding edge 16.

Next, the state of use of the heat-insulating container according to the invention having the above-mentioned structure will be explained.

First, when the intake valve 3 is pressed from above, the intake valve 3 descends against the pressing force of the coil spring 14, and presses the push plate 4 downward.

Then, the bellows 6 is pressed by the push plate 4, and the bellows 5
is contracted, and the bellows 6 is contracted.

At this time, the back edge 19 of the intake valve 3 comes into close contact with the push plate 4 and closes the air circulation hole 18, so that the air compressed by the contraction of the bellows flows out from the ventilation hole 7.

Then, when the pressure on the intake hole 3 is stopped, the intake valve 3 is automatically pushed up by the pressing force of the coil spring 14, and its back edge 19 is separated from the push plate 4 again, and the air circulation hole 18
is opened, air is sent into the bellows 6, the bellows 5 extends, and the push plate 4 rises to its original position together with the intake valve 3.

As mentioned above, this invention simplifies the production of the air compression mechanism by constructing the bellows 6 used in the air compression mechanism by integral molding of resin, thereby providing a heat insulating container at a low cost, and is practical. Excellent effectiveness.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of the head of the heat-insulating container according to this invention, Figure 2 is its bottom view, Figure 3 is a top view of the bellows, and Figure 4 is a top view of the bellows.
The figure is a longitudinal cross-sectional view. 1... Head, 6... Bellows, 7...
...Vent hole, 10...Top opening, 13.
...Recess, 14...Coil spring.

Claims (1)

[Scope of utility model registration request] Bellows 6 made of synthetic resin integrally molded inside the head 1
An upper surface opening 10 having a diameter larger than the maximum diameter of the coil spring 14 is formed at the center of the upper part of the bellows 6, and the periphery thereof is bent upward to form an insertion section 11, and the bottom surface of the bellows 6 is A ventilation hole 7 and a recess 13 are formed in the center, and the bottom of a coil spring 14 inserted into the bellows 6 through the upper opening 10 is fixed in the recess 13, and its tip is formed on the back surface of the intake valve 3. The heat-retaining container is characterized in that the bellows 6 is fitted into an annular groove 15 formed on the back surface of the push plate 4, and the insertion portion 11 of the bellows 6 is fitted into an annular groove 12 formed on the back surface of the push plate 4.