Receptacles – Table dish
Patent
1998-03-19
1999-06-22
Castellano, Stephen
Receptacles
Table dish
215 131, 22059227, B65D 558
Patent
active
059134453
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to insulated containers and insulated lids for use in vacuum flasks, cooler boxes, ice boxes, insulated cups, temperature maintaining lunch boxes, and the like. More specifically, the present invention relates to insulated synthetic resin containers and insulated synthetic resin lids which have a double wall structure which encloses an insulating layer in which a gas having low thermal conductivity has been sealed. A contact preventing projection is formed on the insulating layer side of one of the walls of the double wall structure, this projection supports the other wall which is elastically deformed during the vacuum evacuation of the space formed between the double wall when replacing the gas, as a result, efficient gas replacement is possible, and the insulated synthetic resin container and the insulated synthetic resin lid have excellent insulating performance.
BACKGROUND OF THE INVENTION
Up to the present, for insulated containers which can be used as vacuum flasks, temperature maintaining lunch boxes, and the like, development of insulated synthetic resin containers, which have the advantages of being light weight, easily molded and for which manufacturing costs are low, have been progressing. As this type of insulated synthetic resin container, a container having a lid which can be fitted thereto having the following structure has been proposed. This container is an insulated container formed from an inner container and an outer container which are formed from synthetic resin. The inner container and the outer container which is dimensionally larger than the inner container are put together leaving a space therebetween, and the inner and outer containers are then joined at the respective edges of their mouth parts to give a double walled container. Then a gas having low thermal conductivity comprising at least one gas from the group consisting of xenon, krypton, and argon is enclosed in the space formed between the inner and outer containers. In the same way, the lid is an insulated lid formed from a bottom surface wall and a top surface wall which are formed from synthetic resin. The bottom surface wall and the top surface wall, which is dimensionally larger than the bottom surface wall, are put together leaving a space therebetween, and the top and bottom surface walls are then joined at the respective edges of their mouth parts to give a double walled lid. Then a gas having low thermal conductivity comprising at least one gas from the group consisting of xenon, krypton, and argon is enclosed in the space formed between the top and bottom surface wall.
After the joining of the inner and outer containers to form a double walled container, the above-mentioned insulated synthetic resin container requires a process of vacuum evacuation of the space formed between these inner and outer containers and a subsequent process of charging this space with gas, therefore, for this purpose, a penetrating hole (hereinafter referred to as a penetrating hole) which is an evacuation hole and a gas charging hole is provided in either of the inner container or outer container.
In the same way, after the joining of the top and bottom surface walls to form a double walled lid, the above-mentioned insulated synthetic resin lid requires a process of vacuum evacuation of the space formed between these top and bottom surface walls and a subsequent process of charging this space with gas, therefore, for this purpose, a penetrating hole which is an evacuation hole and a gas charging hole is provided in either of the top surface wall or the bottom surface wall.
When vacuum evacuating the contents of the insulating layer between the inner and outer containers or the top and bottom surfaces having the above-mentioned structure, the space of the insulating layer becomes gradually narrower due to deformation of the inner container and the outer container, and the top surface wall and the bottom surface wall bear the load of atmospheric pressure due to a reduction in press
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Fujii Takafumi
Furuyama Kensuke
Kamachi Hidefumi
Tanaka Atsuhiko
Yamada Masashi
Castellano Stephen
Nippon Sanso Corporation
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