Movable or removable closures – Removable closure
Patent
1993-04-19
1995-04-11
Kannan, Philip C.
Movable or removable closures
Removable closure
404 25, E06B 332, E02D 2914
Patent
active
054046769
ABSTRACT:
A subsurface chamber formed by a pit and buried beneath a surface across which aircraft travel is provided with an effective sealing system at its opening. The opening to the chamber is formed by a mounting frame adapted to receive and seat a lid therewithin. The mounting frame is formed with a frustoconical wall tapering downwardly and inwardly toward the opening into the chamber. The lid is provided with a peripheral rim having a plurality of flexible, resilient, annular, water impervious sealing flaps that extend outwardly from the lid an which are vertically spaced from each other. As the lid is lowered into position, the sealing flaps do not scrape or slide against the frustoconical wall of the mounting frame. Rather, they establish contact with the frame only as the lid approaches to within one quarter inch of its fully seated position. With this contact the sealing flaps are deflected upwardly to form a liquid tight seal against the mounting frame without frictional abrasion against the wall of the frame.
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Dabico Inc.
Kannan Philip C.
Thomas Charles H.
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