DOOR

Japanese Patent JP3609188

B2

PROBLEM TO BE SOLVED: To contrive to be solid against a force exerted from an outdoor side and reduce resistance to a force from an indoor side by extending two middle rails between upper and lower frames and fixing a web of a continuous long member which is laid out in a groove produced by cutting a front surface board between the middle rails and the upper and lower frames.
SOLUTION: A notched groove 6 closes an inlet with a flange 72 and sets up a door 1, thereby hiding the groove 6 from an outside. An external force is applied to the door 1, thereby cutting off a front surface board 3 and upper and lower frames so that the door 1 may bend inwardly, centering on a rear surface board 4. In this case, a web 71 is laid out in the groove 6 produced by cutting the front surface board 3 so that it may strike against both side surfaces. Furthermore, the flange 72 integrated with the web 71 strikes against the front surface board 3, thereby making it difficult to bent the door in the indoor side. The resistance against the force from the indoor side is restricted to the rear surface board 4 alone, thereby weakening the resistance exceptionally. This construction makes it possible to be solid against the force from the outside and safe for protection purposes and open the door 1, which is otherwise impossible to open due to deformations produced by an earthquake or the like by adding force from the indoor side and evacuate.

Hiroyuki Matsumoto

JP3870296A

January 12, 2005

January 31, 1996

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Ritaka Industry Co., Ltd.

E06B3/76; E06B5/00; (IPC1-7): E06B3/76; E06B5/00

JP56116593U
JP6066069A

Hiroshi Onishi

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