Flexible hatch cover

Details Flexible hatch cover Flexible hatch cover

1976-06-28

1977-06-21

Hall, George T.

Receptacles

Closures

Motor driven

220287, 251212, B65D 5500

Patent

active

040306291

ABSTRACT:
A cover for a tank, hatch, or like container having an opening, including two rims about the perimeter of the opening connected by a flexible sleeve. At least one rim is rotatable with respect to the other, and, when rotated, causes the sleeve to close in an iris fashion and seal the opening. Reversing the rotation untwists the sleeve and causes the cover to open. The device of the present invention does not require sliding plates, cams or gears and is adaptable to closing about a pipe or other obstruction placed in the opening.

REFERENCES:
patent: 3329396 (1967-07-01), Heaton
patent: 3787022 (1974-01-01), Wilcox

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