Beds – Bedclothing – And means to facilitate changing thereof
Patent
1985-04-26
1990-07-24
Raduazo, Henry E.
Beds
Bedclothing
And means to facilitate changing thereof
5451, 5455, A47C 2708
Patent
active
049426346
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to support systems. More particularly, the invention relates to support systems such as mattresses, cushions, upholstery padding and the like which have a liquid in them such as, for example, waterbeds.
Support systems which contain liquids, such as waterbeds and cushions and the various benefits thereof are well-known. On the other hand, such systems exhibit many disadvantages. For example, conventional waterbeds and cushions produce a kind of wave action or rolling motion when in use due to the tendency of the water or other liquid inside the system to rush rapidly from one part thereof to another when an individual places his weight thereon and forces the liquid to flow to another part of the system. Moreover, since the envelope containing the liquid in such a system is typically elastically yieldable, a reaction to the initial liquid surge occurs. This reaction results in a succession of countersurges within the envelope until the system reaches equilibrium. The described undamped surging and countersurging of the liquid in such systems is not only annoying to most individual users of such systems, but actually results in motion sickness in some of them. In order to obviate the above-mentioned disadvantages, many waterbed manufacturers do not employ liquid displacement in that portion of the system which is intended to support the head and shoulders of the user. Instead, they employ a section of mattressing constructed in the usual manner utilizing coil springs or other equivalent non-liquid structures. Obviously, this introduces an element of complexity to the manufacturing processes and, as well, increased costs.
Some manufacturers of waterbeds have attempted to dampen wave motion in various ways. For example, in U.S. Pat. No. 3,585,356 solid particles, such as styrofoam are disposed in the liquid for this purpose, while U.S. Pat. No. 3,600,726 discloses a therapeutic or comfort pad having a flexible film outer envelope filled with a fluid pervious foam material, water or other fluid being introduced thereto through a valve in the envelope. A flotation pad of somewhat similar construction is disclosed in U.S. Pat. No. 3,611,455. On the other hand, U.S. Pat. No. 3,736,604 discloses flap means, as illustrated in FIG. 11 thereof, for this purpose. In U.S. Pat. No. 4,245,361 there is disclosed a waterbed mattress having a sealed liquid enclosure made of a relatively stiff peripheral cushion of foam material having a central cavity which contains a resilient open-cell filling.
A pad having open-cell resilient foam material encased in and bonded to an impervious envelope provided with a valve for communication with the interior of the envelope to permit passage and containment of fluid is disclosed in U.S. Pat. No. 3,872,525 to provide a damped liquid displacement system. Another liquid displacement system is disclosed in U.S. Pat. No. 3,789,442 which shows a low liquid volume, low weight liquid or water pad for use as a mattress in which a lower cellular foamed material flexible pad is partially hollowed out for reception of a flexible material, liquid filled container, an unhollowed portion of the pad being provided for a user's head and upper body, which the liquid container does not rest on. An upper flexible pad of the same cellular foamed material extends across the lower pad. The entire structure described is contained within a flexible water impervious sheath, the structure being inserted through openings in the ends of the sheath which are subsequently closed. Another low-water volume, low-weight water pad for use as a mattress or cushion having a water-filled container sandwiched between upper and lower layers of cellular foam sheets all surrounded with a water impervious sheet is disclosed in U.S. Pat. No. 3,702,484.
U.S. Pat. No. 2,748,399, on the other hand, discloses a light-weight foam rubber cushioning structure in which a bag or chamber having a plurality of compartments, which may either communicate with or be isolated from one another,
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Saloff David
Saloff William S.
Lumex, Inc.
Raduazo Henry E.
Smith Creighton
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