Door-like closure

Details Door-like closure Door-like closure

1977-08-30

1979-12-18

Corbin, David H.

Safes, bank protection, or a related device

Combined

With means to prevent successful use of explosives

109 42, 109 76, 109 83, 109 85, E05G 1026

Patent

active

041788591

ABSTRACT:
A door-like closure for passageways in high-risk high-security installations includes a multilayer protective plate which has a rather high resistance to mechanical, thermal and chemical damaging influences, but which can be rather easily damaged by the action of explosives. To reinforce the protective plate, a reinforcing grid is juxtaposed therewith at the major surface thereof which faces the interior of the installation so that, when an attempt is made to destroy the protective plate by explosives, the reinforcing grid not only will increase the resistance of the protective plate to damage but also will permit the explosive shockwave and the possible debris of the protective plate propelled thereby to penetrate through the apertures of the grid without causing any considerable damage to the grid. The apertures of the grid have such dimensions that an intruder will not be able to reach through the aperture into the interior of the installation to, for instance, manipulate the lock of the closure. The grid may consist of a plurality of grid elements of polygonal cross sections which intersect each other at right angles in two sets and in one or two layers, being connected to each other between the two sets. However, the reinforcing grid may be a homogeneous reinforcing plate formed with the apertures. A plurality of passages may be provided in the protective plate, extending substantially parallel to the plane of the protective plate and serving to divert the flow of the effects of the explosion from normal to the plane of the protective plate to substantially parallel thereto. A contact mesh may be incorporated in the protective plate and generate a signal when the latter is damaged or otherwise tampered with.

REFERENCES:
patent: 139414 (1873-05-01), Mulford
patent: 317688 (1885-05-01), Tripp
patent: 530410 (1894-12-01), Giessler
patent: 893288 (1908-07-01), Walters
patent: 960767 (1910-06-01), Allen
patent: 1026207 (1912-05-01), Johnson
patent: 1232330 (1917-07-01), Kenyon
patent: 1440484 (1923-01-01), Mooney
patent: 1538223 (1925-05-01), Smyers et al.
patent: 1805610 (1931-05-01), Young
patent: 1888042 (1932-11-01), Lynn et al.
patent: 2181466 (1939-11-01), Shackett
patent: 3826172 (1974-07-01), Dawson

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