Receptacles – Outlet or junction box type – Sectional receptacle
Patent
1990-03-13
1991-03-26
Pollard, Steven M.
Receptacles
Outlet or junction box type
Sectional receptacle
220469, 220470, G01M 300
Patent
active
050021958
ABSTRACT:
A plastic liner sheet is positioned between an outer bottom wall and an inner bottom wall of a dual wall tank providing uniform spacing and a degree of support. The liner sheet is molded with integral spacer elements in the form of semi-spherical bosses extending from the top and bottom surfaces of the liner sheet. Equilaterally positioned depressions surround each boss so that a boss on one side forms a depression on the opposite side and vice versa. The support function is augmented by providing a series of steel balls which are placed in selected depressions dependent on the expected loading on the tank bottom from the weight of the tank and its contents. The inner tank bottom may be constructed by butt welding a series of steel plates of desired shape to form the tank floor with weld backing plates resting on the liner top and supported by a linear line of the spaced steel balls in a spaced number of linearly aligned depressions.
REFERENCES:
patent: 4000595 (1977-01-01), Fortescue
patent: 4552166 (1985-11-01), Chadbourne, Sr. et al.
patent: 4651893 (1987-03-01), Mooney
patent: 4739895 (1988-04-01), Bachmann
patent: 4840283 (1989-06-01), Lillywhite et al.
patent: 4859262 (1989-08-01), Sharp
patent: 4871081 (1989-10-01), Ershig
Baker Hughes Incorporated
Pollard Steven M.
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