Tamper-proof emergency exit window grate

Details Tamper-proof emergency exit window grate Tamper-proof emergency exit window grate

1977-05-09

1978-09-05

Holko, Thomas J.

Closure fasteners

Bolts

Emergency operating means

49 56, 49141, 292188, E05C 1502, E05C 106

Patent

active

041114728

ABSTRACT:
A locking mechanized enclosure is mounted at the edge of a hinged window grate so that its interior side wall and front wall are inaccessible from the outside and all of its exposed walls are solid. A locking member extends into the enclosure from the window frame in back of vertical blocking member within the enclosure. The blocking member can be raised by depressing a pivoted plate. However, access to the plate is only through a door in the enclosure which can be opened only from inside the grate.

REFERENCES:
patent: 69236 (1867-09-01), Miller et al.
patent: 250592 (1881-12-01), Smith
patent: 1436892 (1922-11-01), Morse et al.
patent: 1670430 (1928-05-01), Alexander
patent: 1801284 (1931-04-01), McNulty
patent: 2031725 (1936-02-01), Mellor
patent: 2641494 (1953-06-01), Burris
patent: 2789849 (1957-04-01), Hughes
patent: 3724130 (1973-04-01), Bogue
patent: 3921334 (1975-11-01), Black
patent: 3953939 (1976-05-01), Klein
patent: 4033156 (1977-07-01), Cottingham

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