Ventilation – Exterior vault or manhole cover
Patent
1998-02-27
1999-11-02
Joyce, Harold
Ventilation
Exterior vault or manhole cover
55506, 454271, F24F 1328
Patent
active
059760079
ABSTRACT:
A security vent, providing a housing assembly mounted to a support, the housing assembly including a side wall portion having first and second distal ends thereof and defining a passageway therebetween; a drawer assembly having a filter-receiving slot therein, the drawer assembly being slidingly received by the housing assembly second distal end, the drawer assembly being moveable within the housing assembly passageway between an open position and a closed position, wherein the filter-receiving slot is disposed within the housing assembly when the drawer assembly is in the closed position, and wherein the filter-receiving slot is in communication with a region outside the housing support when the drawer assembly is in the open position; and, a latch assembly mounted to the housing assembly, the latch assembly being moveable between a locked position and an unlocked position, the latch assembly being received by a latch-receiving notch provided in the drawer assembly when the drawer assembly is in the closed position and the latch assembly is in the locked position.
REFERENCES:
patent: 2575499 (1951-11-01), Manow
patent: 3204392 (1965-09-01), Schwab
patent: 3301168 (1967-01-01), Schindler et al.
patent: 3740934 (1973-06-01), Shuler
patent: 5280273 (1994-01-01), Goldstein
patent: 5421862 (1995-06-01), Davis
patent: 5679121 (1997-10-01), Kim
Powell Robert A.
Stephens Richard W.
Joyce Harold
Stelter Daniel C.
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