초록 ▼

A lunch box has a housing defining a hot and a cold compartment. An arrangement is provided in the lunch box for creating vacuum inside the compartments so as to releasably seal the cover of the lunch box onto the housing. Ribs or protrusions are provided on inner surfaces of the compartments to sub

A lunch box has a housing defining a hot and a cold compartment. An arrangement is provided in the lunch box for creating vacuum inside the compartments so as to releasably seal the cover of the lunch box onto the housing. Ribs or protrusions are provided on inner surfaces of the compartments to substantially prevent contact between stored food and the inner surfaces of the compartments. A device for producing heat may be provided in the hot compartment. Vacuum created inside the lunch box and minimal contact between the stored food and surfaces of the compartments substantially eliminates convection and conduction of heat to and from the stored food thereby effectively maintaining the temperature of the stored food over longer periods of time.

대표청구항 ▼

A lunch box for maintaining the temperature of stored food, comprising: an external box housing defining within itself at least one compartment for storing food therein; the compartment for storing food having inner wall surfaces, means formed on at least a portion of the inner wall surfaces for sub

A lunch box for maintaining the temperature of stored food, comprising: an external box housing defining within itself at least one compartment for storing food therein; the compartment for storing food having inner wall surfaces, means formed on at least a portion of the inner wall surfaces for substantially preventing contact between food stored in the compartment and the inner wall surfaces of the compartment; and a cover over the housing for enclosing the compartment, whereby transfer of heat between the stored food and the inner wall surfaces of the compartment is substantially eliminated; and further comprising vacuum creating means in fluid communication with the compartment for creating a vacuum in the compartment. A lunch box for maintaining the temperature of stored food, comprising: an external box housing defining within itself at least one compartment for storing food therein; the compartment for storing food having inner wall surfaces, means formed on at least a portion of the inner wall surfaces for substantially preventing contact between food stored in the compartment and the inner wall surfaces of the compartment; a cover over the housing for enclosing the compartment; and vacuum creating means in the housing in fluid connection with the inside of the compartment for creating vacuum in the compartment by evacuating substantially all of the air therein, whereby a vacuum is created inside the compartment so as to releasably secure the cover to the housing and to maintain the inside of the compartment below atmospheric pressure.