Beds – Bedclothing – And means to facilitate changing thereof
Patent
1989-08-17
1990-03-06
Grosz, Alexander
Beds
Bedclothing
And means to facilitate changing thereof
5451, A47C 2708
Patent
active
049053310
ABSTRACT:
An improved waterbed structure including an upwardly opening frame with a horizontal watermattress supporting platform and vertical longitudinally and laterally extending upwardly projecting side and end retaining boards about the perimeter of the platform, a waterfilled watermattress of soft flexible sheet plastic material with a bottom wall supported atop the platform, side and end walls supported by the side and end boards and a normally substantially flat horizontal user supporting top wall. The watermattress includes a multiplicity of longitudinally and laterally spaced elongate vertically extending and downwardly tapering support spring parts of soft resilient interconnected cellular material in load supporting relationship between the top and bottom walls. The support spring parts are shaped springs that afford progressively greater vertical load supporting force as they are compressed and are positioned within those portions of the watermattress where supplemental vertical load carrying capacity is advantageously afforded. Water within the parts controls their spring rate as it is expressed from and drawn into those parts upon compression and relaxation thereof. The downwardly tapered parts work to notably impede lateral movement of water and absorb wave motion energy within the upper portion of the watermattress while affording no appreciable resistance to the free movement and distribution of water throughout the lower portion thereof.
REFERENCES:
patent: 4301560 (1981-11-01), Fraige
patent: 4328599 (1982-05-01), Mollura
patent: 4330893 (1982-05-01), Matsui
patent: 4332043 (1982-06-01), Larson
patent: 4532662 (1985-08-01), Sama
patent: 4751756 (1988-06-01), Monzo
Grosz Alexander
Maxwell Georges A.
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