Drop vent wall system

Details Drop vent wall system Drop vent wall system

1976-05-21

1978-04-11

Kannan, Philip C.

Movable or removable closures

Closure hangs on flaccid connector

49360, 49404, 52 64, 52207, E01F 1300, E05F 1100

Patent

active

040831493

ABSTRACT:
A wall system suitable for use in the ventilating of buildings which incls a vertically adjustable, drop vent, upper wall section subwall which is offset from and adapted to be raised or lowered relative to a stationary lower subwall by means of a winch and pulley arrangement.

REFERENCES:
patent: 1452746 (1923-04-01), Lyding
patent: 2160366 (1939-05-01), Marchenko
patent: 3154303 (1964-10-01), Cavallero et al.
patent: 3429298 (1969-02-01), Thomason
patent: 3511299 (1970-05-01), Newell et al.
patent: 3802479 (1974-04-01), Newell et al.
patent: 3915377 (1975-10-01), Sutton, Jr.

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