Gerald Lathan Mccall

US Patent:

53795555, Jan 10, 1995

Filed:

Aug 4, 1992

Appl. No.:

7/924671

Inventors:

Stephen F. Strieb - Novato CA
Gerald W. McCall - Vallejo CA

International Classification:

F04B 500
F04D 514

US Classification:

52 3

Abstract:

In accordance with the invention, the device is provided for constructing a temporary cover for a drain opening surrounded by a framing surface of horizontal, curved or irregular shape, comprising M sheets of flame and/or chemical resistant materials in broad surface contact defining coextensive top and bottom surfaces, said top and bottom surfaces each including a smooth, non-quilted central section and an outer edge section in integral contact with said central section, said outer edge sections together defining a series of undulations therebetween, weighted chain means inserted within said series of undulations so as to add loft and weight as a function of radial extent whereby sealing pressure of said bottom surface relative to an associated horizontal, slightly curved or irregular attaching surface is surprising strong. Method steps related to use and manufacture are also recited.