Trenchduct construction having adjustable lid-supporting means
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United States of America Patent
Stats
-
Sep 20, 1983
Grant Date -
N/A
app pub date -
Apr 16, 1981
filing date -
Apr 10, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A subfloor trenchduct (10) construction in which the side wall members (14, 16) and lid-supporting means (37) are constructed of galvanized steel in order to provide a reduced cross section for the component members and thereby maximizing the availability of internal space within the trenchduct (10) for electric service. The galvanized steel construction obviates larger cross sections previously employed in utilization of aluminum components which detracted from the effective use of internal space of the duct, and the aluminum components required protective coating since aluminum, when exposed to alkaline concrete, experiences deterioration of the components. The lid-supporting means (37) is made vertically adjustable relative to floor level so that prior to pouring of the concrete (66) the lid (30) is accurately located in relation to the floor.
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