# Patent

## Title
Inflatable liquid furniture

## Abstract

An apparatus has a first section having a hollow interior that is filled with air, and a second section attached to the top of the first section and having a hollow interior that retains a liquid.

## Background
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to inflatable furniture, and in particular, to inflatable furniture having chambers filled with liquid.
2. Description of the Prior Art
Portable furniture, such as sofas, chairs, mattresses, sleeping bags, sleeping mats, futons and similar products have become very popular in recent times. Some of these furniture items are inflatable, which renders them more convenient for use because they can be deflated to a smaller profile for storage or transportation.
Unfortunately, these inflatable furniture items are not very comfortable. For example, inflatable mattresses provide a firm base for the user to sleep on, but is not very comfortable because a fully inflated mattress is very firm and does not conform to the user's body. Specifically, the inner chamber of a fully inflatable mattress is completely filled with air so that the surfaces of the mattress are not compliant to a user's body.
Thus, there still remains a need to provide portable furniture which is comfortable for the user, convenient to use, and easy to store.
SUMMARY OF THE DISCLOSURE
It is an object of the present invention to provide portable furniture which is comfortable for the user.
It is another object of the present invention to provide portable furniture that is convenient to use and easy to store.
In order to accomplish the objects of the present invention, the present invention provides an apparatus having a first section having a hollow interior that is filled with air, and a second section attached to the top of the first section and having a hollow interior that retains a liquid.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a portable bedding apparatus according to one embodiment of the present invention.
FIG. 2 is a cross-sectional view of the apparatus of FIG. 1 taken along lines 2—2 thereof.
FIG. 3 is a perspective view of a portable bedding apparatus according to another embodiment of the present invention.
FIG. 4 is a cross-sectional view of the apparatus of FIG. 3 taken along lines 4—4 thereof.
FIG. 5 is a perspective view of the apparatus of FIG. 3 shown with a cover and sleeping base added thereto.
FIG. 6 is a perspective view of a portable bedding apparatus according to another embodiment of the present invention.
FIG. 7 is a cross-sectional view of the apparatus of FIG. 6 taken along lines 7—7 thereof.
FIG. 8 is a perspective view of a portable bedding apparatus according to yet another embodiment of the present invention.
FIG. 9 is a cross-sectional view of the apparatus of FIG. 8 taken along lines 9—9 thereof.
FIG. 10 is a perspective view of a portable bedding apparatus according to yet a further embodiment of the present invention.
FIG. 11 is a cross-sectional view of the apparatus of FIG. 11 taken along lines 11—11 thereof.
FIGS. 12–14 are perspective views of portable bedding apparatus according to further embodiments of the present invention.
FIG. 15 is a cross-sectional view of the apparatus of FIG. 14 taken along lines 15—15 thereof.
FIG. 16 is a perspective view of a portable bedding apparatus according to yet a further embodiment of the present invention.
FIG. 17 is a perspective view of a portable massage table according to one embodiment of the present invention.
FIG. 18 is a perspective view of a chair according to one embodiment of the present invention.
FIG. 19 is a perspective view of an office chair according to one embodiment of the present invention.
FIG. 20 is a perspective view of a sofa according to one embodiment of the present invention.
FIG. 21 is a perspective view of an ottoman or seat according to one embodiment of the present invention.
FIGS. 22–24 are perspective views of chairs according to other embodiments of the present invention.
FIG. 25 is a perspective view of a pillow according to one embodiment of the present invention.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The following detailed description is of the best presently contemplated modes of carrying out the invention. This description is not to be taken in a limiting sense, but is made merely for the purpose of illustrating general principles of embodiments of the invention. The scope of the invention is best defined by the appended claims.
FIGS. 1 and 2 illustrate a portable bedding apparatus 20 according to one embodiment of the present invention. The apparatus 20 has a base section 22, a middle section 24 and a top section 26. The base section 22 can be an inflatable chamber having an inlet/outlet 28 through which air can pass. The middle section 24 can be a hollow chamber having an inlet/outlet 30 through which a liquid (e.g., water) can pass. The top section 26 can also be an inflatable chamber having an inlet/outlet 32 through which air can pass. Thus, the top and bottom sections 26, 22 can be filled with air, while the middle section 24 can be filled with a liquid 34. The three sections 22, 24, 26 can be sized and configured so that the apparatus 20 will appear to be a unitary structure; for example, the sections 22, 24, 26 can have the same size and shape. The sections 22 and 26 are inflatable, and are made from an inflatable material (e.g., plastic, PVC, leather and nylon) that has an interior chamber for receiving air or fluid that is introduced through an air inlet 26. Another example of a possible material for the sections 22 and 26 is a soft fabric that is lined with a plastic coating. In this regard, each section 22 and 26 can be similar to a conventional inflatable mattress. The middle section 24 can be made of a soft and flexible material that is adapted to hold liquids (e.g., plastics, PVC, etc.). Each section 22, 24, 26 can be irremovably secured to an adjacent section 22, 24, 26 (e.g., by heat fusing, glue, and similar techniques), or removably secured to an adjacent section 22, 24, 26 (e.g., by VELCROTM pads, ties, loops and similar devices).
The apparatus 20 can be used like a conventional mattress, with the added benefit that the middle section 24 provides a more comfortable support for the back and body. In this regard, the middle section 24 is filled with a liquid, which readily conforms to the user's body. However, if the middle section 34 is large, the large mass of liquid inside the middle section 34 may cause the middle section 24 to be very wavy and possibly uncomfortable (in other words, almost like sleeping on a water bed). Therefore, providing a thin top section 26 that is filled with air on top of the conforming middle section 24 firms up the liquid effect of the middle section 24 to provide a more comfortable sleeping surface. The thickness and volume of the chambers inside the sections 22, 24, 26 can be varied to adjust the desired firmness of the bedding apparatus 20. For example, providing a smaller volume middle section 24 with a larger volume top section 26 would provide a firmer sleeping surface.
FIGS. 3 and 4 illustrate another portable bedding apparatus 40 according to another embodiment of the present invention. The apparatus 40 is similar to the apparatus 20 in FIGS. 1 and 2 and applies the same principles as the apparatus 20 in FIGS. 1 and 2, but the configurations have been modified to provide different functionalities and results. The apparatus 40 has a base section 42, a middle section 44 and a top section 46. The base section 42 and the middle section 44 can be inflatable chambers having an inlet/outlet 48 and 50, respectively, through which air can pass. The top section 46 can be a hollow chamber having an inlet/outlet 52 through which a liquid (e.g., water) can pass. Thus, the base and middle sections 42, 44 can be filled with air, while the top section 46 can be filled with a liquid 54. The three sections 42, 44, 46 can be sized and configured so that the apparatus 40 will appear to be a unitary structure; for example, the sections 42, 44, 46 can have the same size and shape. The sections 42 and 44 can have the same construction (and materials) as the sections 22 and 26, and the section 46 can have the same construction (and materials) as the section 24. Each section 42, 44, 46 can be irremovably secured to an adjacent section 42, 44, 46 (e.g., by heat fusing, glue, and similar techniques), or removably secured to an adjacent section 42, 44, 46 (e.g., by VELCROTM pads, ties, loops and similar devices).
The apparatus 40 can also be used like a conventional air mattress, with the added benefit that the top section 46 provides a more comfortable support for the back and body. In this regard, the top section 46 is filled with a liquid, which readily conforms to the user's body and provides the improved comfort when compared to a conventional air mattress. More significantly, the volume of the top section 46 can be small, so that only a small amount of liquid is needed to fill the chamber of the top section 46. As a result, the overall weight of the apparatus 40 when in use is significantly lighter than compared to a conventional water bed. In addition, the reduced volume makes it faster and more convenient for a user to fill up the top section 46 when compared to a conventional water bed that typically requires a larger volume of liquid. An additional benefit realized by the reduced volume of liquid is that accidental leakage or puncture of the top section 46 will not result in a serious flooding problem in the bedroom when compared to a conventional water bed that would normally flood a bedroom if it were to leak or puncture. Thus, the apparatus 40 provides the benefits (e.g., reduced firmness) of a conventional water bed while avoiding the drawbacks of conventional water beds (e.g., large volume of water needed, and flooding) and conventional air mattresses (e.g., too firm). These principles and benefits relating to the reduction of water volume and varying firmness apply to all the other embodiments as well.
FIG. 5 illustrates the addition of a cover 56 to the top of the top section 46 to function as a blanket. In addition, a soft sleeping base 58 can can be attached to the top of the top section 46 to provide the user with a comfortable surface to lie on. The cover 56 and the sleeping base 58 define a sleeping space therebetween for the user's body. The cover 56 can be stitched to two sides of the sleeping base 58 so that the combined cover 56 and sleeping base 58 actually forms a sleeping bag. The cover 56 and the sleeping 58 is preferably made from a soft cloth-like material, and can include soft paddings, down and any other conventional material that is typically used to provide sleeping bags with a soft and fluffy feel. The length of the cover 56 is shorter than the length of the sleeping base 58 so that the user can place his or her head on the exposed portion of the sleeping base 58.
The sleeping base 58 can be removably attached to the top section 46 by a removable attachment mechanism, such as opposing VELCROTM pads provided on the bottom of the sleeping base 58 and the top of the top section 46. Other removable attachment mechanisms can be used, including but not limited to zippers, hooks and clasps, among others. Thus, the sleeping base 58 and the cover 56 can be removed so that the sleeping base 58 and the cover 56 can be washed.
The apparatus 40 can be easily and conveniently packed for storage by removing the sleeping base 58 and the cover 56 from the top section 46, and then folding the base 58 and the cover 56 in the same manner as folding a conventional sleeping bag. The liquid can then be emptied from the top section 46, and the middle section 44 and the base section 42 can be deflated. The sections 42, 44, 46 can then be folded into a small configuration. For example, a pouch (not shown) can be provided for holding the folded components of the apparatus 40. The pouch can then be conveniently carried around by the user. These same techniques can be applied to any of the other embodiments disclosed herein.
FIGS. 6 and 7 illustrate yet another portable bedding apparatus 60 according to another embodiment of the present invention. The apparatus 60 is similar to the apparatus 40 in FIGS. 3–5 and applies the same principles as the apparatus in FIGS. 1–5, but the configurations have been modified to provide different functionalities and results. The apparatus 60 has an outer base section 62 and a top inner section 64. The base section 62 can be an inflatable chamber having an inlet/outlet 68 through which air can pass. The top section 64 can be a hollow chamber having an inlet/outlet 70 through which a liquid (e.g., water) can pass. Thus, the base section 62 can be filled with air, while the top section 64 can be filled with a liquid 72. As best shown in FIG. 7, the base section 62 has a base 74 and a surrounding wall 66 that defines a cavity region therein, with the top section 64 sized and configured to fit snugly inside the cavity region. The base section 62 can have the same construction (and materials) as the sections 22 and 26, and the top section 64 can have the same construction (and materials) as the section 24. The section 64 can be irremovably secured (e.g., by heat fusing, glue, and similar techniques), or removably secured (e.g., by VELCROTM pads, ties, loops and similar devices), to the cavity region in the section 62.
The apparatus 60 can be used in the same manner as the apparatus 40 in FIGS. 3–5, and enjoys the same functions and benefits as the apparatus 40 in FIGS. 3–5, except that the apparatus 60 only provides one air-inflatable section, and provides an air-inflatable surrounding wall 66 for the liquid-filled top section 64. The surrounding wall 66 provides additional protection for the top section 64.
FIGS. 8 and 9 illustrate another portable bedding apparatus 80 according to another embodiment of the present invention. The apparatus 80 is similar to the apparatus 40 and 60 in FIGS. 3–7 and applies similar principles. The apparatus 80 has a base section 82 and a top section 84. The base section 82 can be an inflatable chamber having an inlet/outlet 88 through which air can pass. The top section 84 can be a hollow chamber having an inlet/outlet 90 through which a liquid (e.g., water) can pass. The sections 82, 84 can be sized and configured so that the apparatus 80 will appear to be a unitary structure; for example, the sections 82, 84 can have the same size and shape. The top section 84 has a base 86 and a surrounding wall 92 that defines a cavity region therein, with an inner section 94 sized and configured to fit snugly inside the cavity region. The inner section 94 can be an inflatable chamber having an inlet/outlet 98 through which air can pass. The base section 82 and the inner section 94 can have the same construction (and materials) as the sections 42 and 44, and the top section 84 can have the same construction (and materials) as the section 46. The sections 82, 84 and 94 can be irremovably secured (e.g., by heat fusing, glue, and similar techniques), or removably secured (e.g., by VELCROTM pads, ties, loops and similar devices), to each other.
The apparatus 80 can be used in the same manner as any of the other apparatus 20, 40, 60, and enjoys the same functions and benefits as these apparatus 20, 40, 60. The apparatus 80 borrows some of the principles from the apparatus 20 in FIGS. 1–2 (e.g., having an air-inflatable section at the very top) and the apparatus 60 in FIGS. 6–7 (e.g., providing a surrounding wall 84 for the section 94), and nicely illustrates how the various concepts and configurations of these embodiments can be modified and applied to create different embodiments.
FIGS. 10 and 11 illustrate another portable bedding apparatus 120 according to another embodiment of the present invention. The apparatus 120 is similar to the apparatus 60 and 80 in FIGS. 6–9 and applies similar principles. The apparatus 120 has a base section 122 and an upper wall section 124. Each section 122, 124 can be a hollow chamber that can receive and retain air or a liquid (e.g., water). Inlets/outlets 126 and 128 are provided in the sections 122 and 124, respectively, to allow air or liquid to pass therethrough. The sections 122, 124 can be sized and configured so that the apparatus 120 will appear to be a unitary structure; for example, the sections 122, 124 can have the same outer size. The wall section 124 is ring-like in that it forms an inner space 130 which receives one or more inner sections 132, 134, 136 snugly therein, one on top of the other. Inlets/outlets 138 can be provided for each of these inner sections 132, 134, 136 to allow liquid or air to be introduced into the section. These inlets/outlets 138 can extend through bores 140 provided in the wall section 124. The sections 122, 124, 132, 134, 136 can have the same construction (and materials) as any of the sections 42, 44 and 46 above. The sections 122, 124, 132, 134, 136 can be irremovably secured (e.g., by heat fusing, glue, and similar techniques), or removably secured (e.g., by VELCROTM pads, ties, loops and similar devices), to each other. Each inner section 132, 134, 136 can be a hollow chamber that can receive and retain air or a liquid (e.g., water). For example, one or more of the inner sections 132, 134, 136 (e.g., the top inner section 136) can be filled with liquid, while the other inner sections can be filled with air. The provision of three separate inner sections 132, 134, 136 (one on top of the other) allows for the firmness to be adjusted to a greater degree than the other embodiments set forth hereinabove. For example, filling one inner section (e.g., 134) with a liquid will provide a firmer sleeping support than filling two inner sections (e.g., 132, 136) with a liquid.
The apparatus 120 can be used in the same manner as any of the other apparatus 20, 40, 60 and 80, and enjoys the same functions and benefits as these apparatus 20, 40, 60 and 80. The apparatus 120 also borrows some of the principles from the apparatus 60 and 80 in FIGS. 6–9 (e.g., providing a surrounding wall 124 for the inner sections 132, 134, 136).
FIG. 12 illustrates a portable bedding apparatus 40a that is similar to the apparatus 40 in FIGS. 3 and 4. The apparatus 40a also has two sections 42a and 44a that can be the same as the sections 42 and 44, respectively, in FIGS. 3 and 4, but the section 46 in FIGS. 3 and 4 is now replaced by a plurality of separate sub-sections 46a. Each sub-section 46a can be the same as the section 46, except that each sub-section 46a is provided in a smaller size. Each sub-section 46a is attached (e.g., by heat sealing or stitching) to a separate sub-section 46a. Each sub-section 46a has a separate internal chamber than can be adapted to retain air or a liquid. An air pump 45a can be provided to inflate and deflate the sections 42a and 44a. 
If all the sub-sections 46a are filled with liquid, then the apparatus 40a can function in the same manner as the apparatus 40, with the primary difference being that the user can vary the firmness along the length of the apparatus 40 by varying the volume of liquid used to fill each sub-section 46a. For example, the user can choose to fill one of the end sub-sections 46a with less liquid so that the that particular sub-section 46a provides a firmer surface. This sub-section 46a can then be used for receiving a pillow, since it may be less comfortable to rest the head (via the pillow) on a very wavy or soft surface. In addition, by separating the entire volume of liquid needed to fill the section 46 in FIGS. 3–4 into a plurality of separate sub-sections 46a, the fact that each sub-section 46a retains less liquid would provide a slightly firmer sleeping surface throughout the length of the apparatus 40a when compared with the apparatus 40.
FIG. 13 illustrates a portable bedding apparatus 150 that is similar to the apparatus 40 in FIGS. 3 and 4. The apparatus 150 also has a top section 154 that can be the same as the top sections 46 in FIGS. 3 and 4, but the base section 152 in FIG. 13 can be either a section that is adapted to receive liquid or air, or a conventional mattress, or a conventional mattress box spring, or a foam block. In fact, it is possible to replace any of the air-filled sections described herein with a foam block section. If the base section 152 is a conventional mattress or box spring, then this embodiment illustrates the use of the liquid-filled top section 154 to provide a more comfortable, compliant, and softer sleeping surface. A user can use the top section 154 with any conventional mattress or box spring depending on the user's desired comfort level, health needs, or whim. Straps 156 (elastic or non-elastic) can be secured to the corners of the top section 154, and each strap 154 (four in total) can be looped around the bottom of each corner of the base section 152. Instead of the straps 156, opposing VELCROTM pads and other similar attachment mechanisms (as described above) can be used to removably attach the top section 154 and the base section 152 together.
FIGS. 14 and 15 illustrate another portable bedding apparatus 160 according to another embodiment of the present invention. The apparatus 160 has a main section 162, and a liquid section 164 retained inside the hollow interior of the main section 162. The main section 162 can be an inflatable chamber having an inlet/outlet 166, through which air can pass. The liquid section 164 can be a hollow chamber having an inlet/outlet 168 through which a liquid (e.g., water) can pass via a tubing 170. The inlet/outlet 168 can include a tube 178 that extends through the wall of the main section 162. The main section 162 can have the same construction (and materials) as the section 22, and the liquid section 164 can have the same construction (and materials) as the section 24.
Thus, the primary difference between the apparatus 160 and the other apparatus described hereinabove is that the liquid section 164 is retained inside the air-filled main section 162. Otherwise, the apparatus 160 can be used in the same manner as any of the other apparatus 20, 40, 60, 80, 120, 140 and 150, and enjoys the same functions and benefits as these apparatus 20, 40, 60, 80, 120, 140 and 150. Providing the liquid section 164 inside the main section 162 allows the sleeping surface of the main section 162 to be softened because the liquid section 164 imparts a wavy influence to the air retained inside the main section 162.
FIG. 16 illustrates a modification that can be made to the top section 46 in FIGS. 3 and 4, and borrows from the principles illustrated in FIG. 12. The top section 46b in FIG. 16 can be separated into a plurality of side-by-side elongated segments 100a, 100b, 100c, 100d, 100e, 100f, 100g. Each elongated segment can be filled with either air or a liquid. For example, all the segments 100a, 100b, 100c, 100d, 100e, 100f, 100g can be filled with air, all the segments 100a, 100b, 100c, 100d, 100e, 100f, 100g can be filled with a liquid, or alternating segments can be filled with air (e.g., 100a, 100c, 100e, 100g) and a liquid (e.g., 100b, 100d, 100f). As another example, selected segments (e.g., 100a and 100g) can be filled with air while other segments (e.g., 100b, 100c, 100d, 100e, 100f) can be filled with a liquid to provide firmer sides and a softer and more compliant interior. Thus, the top section 46b provides a user with a considerable amount of flexibility in adjusting the comfort level and feel of the sleeping surface.
The principles of the present invention are not limited to the portable bedding apparatus described above, and can applied to numerous other furniture and similar items. As one non-limiting example, FIG. 17 illustrates a massage table 200 that has two base sections 202 and 204, each of which can be the same as the section 42 in FIGS. 3 and 4. The two base sections 202, 204 can be hingedly attached (e.g., by stitching) to each other. The massage table 200 also has two top sections 206 and 208, each of which can be the same as the top section 46 in FIGS. 3 and 4. The two top sections 206, 208 can also be hingedly attached (e.g., by stitching) to each other. In addition, the top sections 206 and 208 are positioned directly above the base sections 202 and 204, respectively. Applying the principles set forth in FIGS. 3–4, the top sections 206, 208 would retain a liquid and the base sections 202, 204 would retain air. The top section 206 and the base section 202 can be hingedly folded on top of the top section 208 and the base section 204 to store the massage table 200. The massage table 200 also has a folding frame 210 and legs 212 that are part of the folding frame 210.
FIG. 18 illustrates a chair 220 that has a base section 222 and a seating section 224. The base section 222 has a backrest 226 that extends from the rear of the base section 222 and contiguous thereto. The seating section 224 can be attached (either removably or irremovably) to the top of the base section 222 via any of the attachment mechanisms described above. The sections 222, 224 can have the same construction (and materials) as the sections 42 or 46 in FIGS. 3 and 4. In this embodiment, air or liquid can be filled into the sections 222, 224. For example, if air is filled into the base section 222 and its backrest 226, and a liquid is filled into the seating section 224, the chair 220 can provide similar functions and benefits as the embodiments set forth in FIGS. 3–12 above. It is also possible to fill air into the base section 222 and the seating section 224. Providing a liquid-filled seating section 224 will allow the user to have a somewhat softer (i.e., more compliant) seating surface.
FIG. 19 illustrates an office chair 230 that has a conventional swivel base 232 and legs 234, a seat 236 and a backrest 238. The backrest 238 can be a conventional padded backrest, or it can be an inflatable backrest having the same construction as the section 42 in FIGS. 3–4. The seat 236 can be comprised of at least two sections, such as a base section 240 and a seating section 242 can be attached (either removably or irremovably) to the top of the base section 240 via any of the attachment mechanisms described above. The sections 240, 242 can have the same construction (and materials) as the sections 42 or 46 in FIGS. 3 and 4. As with the chair 220 in FIG. 18, air or liquid can be filled into the sections 240, 242. For example, if air is filled into the base section 240, and a liquid is filled into the seating section 242, the chair 230 can provide similar functions and benefits as the embodiments set forth in FIGS. 3–12 above. It is also possible to fill a liquid into the base section 240, and air into the seating section 242. Alternatively, both sections 240 and 242 can be filled with air, or with a liquid. Providing a liquid-filled seating section 242 will allow the user to have a somewhat softer (i.e., more compliant) seating surface.
FIG. 20 illustrates a sofa 220a that is similar to the chair 220 in FIG. 18. The sofa 220a has a base section 222a and a seating section 224a. The base section 222a can have the same construction (and materials) as the section 42 in FIGS. 3 and 4. The seating section 224a can be attached (either removably or irremovably) to the top of the base section 222a via any of the attachment mechanisms described above. The seating section 224a can have the same construction (and materials) as the section 46 in FIGS. 3 and 4. A plurality of backrest sections 225a and 226a can be attached (either removably or irremovably) to the top rear edge of the seating section 224a via any of the attachment mechanisms described above. The lower backrest section 225a can be attached to the top of the seating section 224a, and the upper backrest section 226a can be attached to the top of the lower backrest section 225a. Each backrest section 225a, 226a can have the same construction (and materials) as the sections 42 or 46 in FIGS. 3 and 4. In this embodiment, air or liquid can be filled into the sections 222a, 224a as described above for the chair 220 of FIG. 18. In addition, the backrest sections 225a, 226a can be filled with either air or a liquid. For example, the lower backrest section 225a can be filled with a liquid and the upper backrest section 226a can be filled with air, or vice versa. Alternatively, all the backrest sections 225a, 226a can be filled with air, or with a liquid. Thus, by providing the backrest in the form of two or more backrest sections 225a, 226a that can retain either air or a liquid, the sofa 220a allows the user to adjust the comfort level and feel of the entire backrest.
FIG. 21 illustrates an ottoman or seat 220e that is similar to the chair 220 in FIG. 18 and the sofa 220a in FIG. 20. The seat 220e has a base section 222e, an intermediate section 223e, and a seating section 224e. The sections 222e, 223e, 224e can have the same construction (and materials) as the sections 42 or 46 in FIGS. 3 and 4. The intermediate section 223e can be attached (either removably or irremovably) to the top of the base section 222e, and the seating section 224e can be attached (either removably or irremovably) to the top of the intermediate section 223e, via any of the attachment mechanisms described above. In this embodiment, air or liquid can be filled into the sections 222a, 223e, 224a as described above for the chair 220 of FIG. 18. For example, air can be filled into the sections 222e and 224e, with liquid filled into the section 223e. Alternatively, liquid can be filled into the sections 222e and 224e, with air filled into the section 223e. As another alternative, liquid can be filled into the section 224e, with air filled into the sections 222e and 223e. It is also possible to fill all sections 222e, 223e, 224e with air, or with a liquid.
FIG. 22 illustrates another chair 220h that is very similar to the chair 220 in FIG. 18. The chair 220h has a base section 222h, a seating section 224h and a backrest 226h that can be the same as the base section 222, the seating section 224 and the backrest 226 in FIG. 18. In addition, the chair 220h has two side arm sections 230h and 232h that can be irremovably secured (e.g., by heat fusing, glue, and similar techniques), or removably secured (e.g., by VELCROTM pads, ties, loops and similar devices), to the sides of the base section 222h, the seating section 224h and the backrest 226h. These sidearm sections 230h, 232h can have the same construction (and materials) as the sections 42 or 46 in FIGS. 3 and 4, and air or liquid can be filled into the sidearm sections 230h, 232h. The chair 220h can also include arm rest sections 234h and 236h that can be attached (either removably or irremovably) to the top of the sidearm sections 230h and 232h, respectively. These arm rest sections 234h, 236h can have the same construction (and materials) as the section 46 in FIGS. 3 and 4, and are adapted to retain a liquid. The liquid-filled arm rest sections 234h and 236h provide a softer and more compliant surface for receiving the arms of a user, thereby increasing the comfort level to the user.
FIG. 23 illustrates another chair 220m that is very similar to the chair 220 in FIG. 18. The chair 220m is a foldable chair, and has a base section 222m, a seating section 224m and a backrest section 226m that is separate from the seating section 224m. The base section 222m and the seating section 224m can be essentially the same as the base section 222 and the seating section 224 in FIG. 18. The backrest section 226m is hingedly attached (e.g., by stitching) to the seating section 224m, and can have the same construction (and materials) as the sections 42 or 46 in FIGS. 3 and 4. Air or liquid can be filled into the backrest section 226m. The chair 220m can be folded for storage, or extended into the deployed position shown in FIG. 23 while being supported by side straps 228m. 
The car seat 220p in FIG. 24 further extends the principles in FIGS. 18–23. The car seat 220p is adapted to be used on a conventional vehicle seat 230p to provide the driver with improved comfort. The car seat 220p is very similar to the chair 220m in FIG. 23, and has a base section 222p, a seating section 224p, an inner backrest section 225p, and an outer backrest section 226p. The backrest sections 225p and 226p are separate from the base section 222p and the seating section 224p. The base section 222p and the seating section 224p can be the same as the base section 222 and the seating section 224 in FIG. 18. The backrest sections 225p and 226p can be hingedly attached (e.g., by stitching) to the base section 222p and seating section 224p, and can have the same construction (and materials) as the sections 42 or 46 in FIGS. 3 and 4. Air or liquid can be filled into the backrest sections 225p and 226p. For example, air can be filled in the base section 222p and the inner backrest section 225p, with a liquid filled in the seating section 224p and the outer backrest section 226p. Filling the seating section 224p and the outer backrest section 226p with a liquid will provide both the seating surface and the backrest surface with a softer (i.e., more compliant) seating surface.
The principles of the present invention are applicable to a wide variety of products. For example, the bedding apparatus shown in FIGS. 1–15 can be used as a pet mattress. As another example, FIG. 25 illustrates a pillow 60a that has the same general construction as the apparatus 60 in FIGS. 6–7. The pillow 60a has an outer base section 62a and a top inner section 64a that can have the same construction and materials as the base section 62 and the top section 64 in FIGS. 6–7. Thus, the base section 62a can be filled with air, while the top section 64a can be filled with a liquid. The base section 62a has a base 74a and two longitudinal walls 66a that defines a concave region therebetween, with the top section 64a sized and configured to fit snugly inside the concave region. The section 64a can be irremovably secured (e.g., by heat fusing, glue, and similar techniques), or removably secured (e.g., by VELCROTM pads, ties, loops and similar devices), to the concave region in the section 62a. 
While the description above refers to particular embodiments of the present invention, it will be understood that many modifications may be made without departing from the spirit thereof. The accompanying claims are intended to cover such modifications as would fall within the true scope and spirit of the present invention.

## Claims

1. An apparatus, comprising:
a first section having a top and a bottom, and a hollow interior that is filled with air;
a second section attached to the top of the first section and having a hollow interior that retains a liquid; and
a third section attached to the bottom of the first section and having a hollow interior that is filled with air.

2. The apparatus of claim 1, wherein the first and second sections have the same size and shape.

3. The apparatus of claim 1, wherein the third section has the same size and shape as the first and second sections.

4. The apparatus of claim 1, wherein the second section has a top surface, and further including a cover attached to the top surface of the second section.

5. The apparatus of claim 1, wherein the second section comprises a plurality of separate sub-sections that are connected to each other.

6. The apparatus of claim 1, further including means for removably coupling the second section to the top of the first section.

7. The apparatus of claim 1, wherein the second section comprises a plurality of side-by-side elongated segments.

8. The apparatus of claim 1, wherein the first section comprises a first plurality of separate sub-sections that are hingedly connected to each other, and the second section comprises a second plurality of separate sub-sections that are hingedly connected to each other.

9. The apparatus of claim 1, further including a backrest extending from the first section.

10. The apparatus of claim 9, wherein the backrest comprises a plurality of separate backrest sections attached on top of each other, with each backrest section having a hollow interior that either is filled with air or retains a liquid.

11. The apparatus of claim 1, further including an arm rest section having a hollow interior that either is filled with air or retains a liquid.

12. An apparatus, comprising:
a first section having a top, and a hollow interior that is filled with air;
a second section attached to the top of the first section and having a hollow interior that retains a liquid, the second section having a top; and
a third section attached to the top of the second section and having a hollow interior that is filled with air;
wherein the third section has the same size and shape as the first and second sections.

13. An apparatus comprising:
a first section having a top and a bottom, and a hollow interior that is filled with air;
a second section attached to the top of the first section and having a hollow interior that retains a liquid; and
a third section attached to the bottom of the first section and having a hollow interior that is filled with air;
wherein the first section has a base and a surrounding wall that defines a cavity region therein, with the second section retained inside the cavity region.