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Title: Water closet tank
Claims: I claim: 1. A water closet tank for toilets, comprising: tank means formed of a thin, rigid, high-impact strength plastic, including a generally-rectangular, open-topped tank and a cover therefor; and liner means formed of a thin plastic having a substantially greater pliability than said plastic of said tank means, including a generally-rectangular, open-topped liner having overall dimensions sufficiently less than those of said tank to fit within said tank and form an air space between the bottoms and side walls of said liner and said tank and an upper rim extended outwardly and offset from the remaining portion of said liner a sufficient distance to contact the inside of said side walls of said tank, said pliability of said liner being sufficient to form a nearly air-tight seal between said upper rim of said liner and said inside of said side walls of said tank. 2. A tank in accordance with claim 1, wherein, the dimensions of the tank and the cover and the undercutting are such that a flush outer surface is presented at the juncture of said cover and said tank. 3. A tank in accordance with claim 1, wherein, both the bottom of the cover and the top of the tank are undercut to present a flush outer surface at the juncture of said cover and said tank. 4. A tank in accordance with claim 1, wherein, the bottom of the cover overlaps the top of the tank and the locking means includes a plurality of downwardly projecting tabs formed on the interior of the bottom of the cover and spaced inwardly from the inside of said bottom of said cover a distance sufficient to clamp said top of said tank between the overlapping portion of said bottom of said cover and said tabs. 5. A tank in accordance with claim 4, wherein, at least some of said tabs are generally flat and parallel to the inner wall of the cover and are spaced from and joined to said inner wall of said cover by generally flat structures perpendicular to said tabs, to thereby form a generally T-shaped structure, and a plurality of slots, equal in number to the number of said T-shaped structures, are formed in the upper edge of the tank to receive the portions of said T-shaped structures which join said tabs to said wall of said cover. 6. A tank in accordance with claim 5, wherein, the T-shaped structures and mating slots form the locking means at least along the front and sides of the tank. 7. A tank in accordance with claim 1, wherein, a horizontally-disposed slot is formed in one of the lower edge of the cover and the upper edge of the tank to receive an object to facilitate removal of said cover from said tank. 8. A tank in accordance with claim 1, wherein, at least one vacuum breaker hole is formed in one of the bottom portion of the cover and the top portion of the tank to facilitate removal of said cover from said tank. 9. A tank in accordance with claim 1, wherein, perpendicularly disposed spacer ribs are formed on one of the outside surface of the liner and the inside surface of the tank, said ribs terminating sufficiently short of the other of said outside surface of said liner and the inside surface of said tank to permit a limited amount of outward flexing of said liner. 10. A tank in accordance with claim 9, wherein, the spacer ribs are formed on the sides of the liner and on the bottom of the tank. 11. A tank in accordance with claim 1, wherein, at least two flat-topped inward projections are formed in the bottom of the tank. 12. A tank in accordance with claim 11, wherein the tops of two of the projections are in essential contact with the bottom of the liner, an aperture is formed in said top of one of said two projections and a mating aperture is formed in the liner to permit mounting of a flush valve assembly therethrough and an aperture is formed in said top of the other of said two projections and a mating aperture is formed in the liner to permit mounting of a ball cock assembly therethrough. 13. A tank in accordance with claim 12, wherein, the flush valve assembly and the ball cock assembly are constructed in a manner to clamp the peripheral edges surrounding the corresponding apertures in the projections and the apertures in the liner together and thereby provide water-tight seals and also bind said liner to the tank. 14. A tank in accordance with claim 11, wherein, the tops of at least two of the projections are spaced a sufficient distance from the bottom of the liner to accommodate the head of a bolt. 15. A tank in accordance with claim 11, wherein, the pliability of the liner and proximity of the tops of the projections to the bottom of said liner are such that downward pressure on said bottom of said liner can be applied to frictionally hold the head of the bolt during mounting of said bolt through said projection. Other info: Inventors: Bemis, Richard A. (Sheboygan, WI, US) Application Number: 557706 Filing Date: 1975-03-12 Publication_date: 1976-06-29 Assignee: Bemis Manufacturing Company (Sheboygan, WI) Primary Class(es): 4/416 4/251.2 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Artis, Henry K. Assistant Examiner: Attorney: Philpitt; Fred |
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