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 The present invention relates to enclosures for swimming pools, particularly aboveground pools.
 A swimming or wading pool has an enclosed area for playing games such as volleyball and basketball, so that the enclosed pool serves as a game court. Various constructions are possible. Advantageously, a pool is surrounded by an enclosure having at least one inflatable bladder.
 In the drawings:
 Swimming or wading pools having an enclosed area for playing games such as volleyball, basketball, and the like are shown in all of the drawing figures. These enclosed pools serve as game courts. Game balls and other equipment are retained within the enclosed area; and the enclosure serves as a fence to prevent a person, who jumps up from inside the pool, from falling onto the surrounding ground. The enclosure also serves as a barrier to prevent persons from falling into the water accidentally.
 An enclosure
 Flexible fencing, netting or other fabric-like material
 The upper ring bladder
 In FIGS.
 The pool and enclosure system of FIGS.
 The pool and enclosure systems of FIGS.
 The enclosures add structural support to pools having inflatable or resilient sidewalls, such that an impact force applied to the top or side of the pool is partially absorbed by the enclosure. These enclosures are physically or frictionally connected to the pool to accomplish this goal. The added support provided by such an enclosure reduces the amount of water that would otherwise spill out during a given impact to the top or side of the resilient pool wall.
 The inflatable bladders, of the pool and enclosure systems of FIGS.
 One way to avoid such fluctuations in firmness is to use an air pump that operates to inflate the bladder(s) when the pressure is below a desired level. Such a pump could be mechanical or electrical. A mechanical pump could operate on the energy generated from the movement of persons inside the enclosure. A solar energy cell or battery could power an electrical pump.
 A second method for controlling pressure variations due to temperature fluctuations is shown in
 A third method is to fill some or all of the bladders with a liquid such as water, in which case there would be substantially no expansion. An advantage of this approach is that the water would have greater mass that a gas, and thus would make the bladders more rigid to better resist impacts on exposed surfaces of the enclosure.
 One could combine the second and third methods, or provide a mix air and liquid in a bladder, and/or include an air shock to give the water someplace to go when the bladder is impacted since water does not compress. Filling one or more bladder members with both air and water has important advantages. The performance of the enclosure can be tuned by varying the ration of air to water. Usually, best results are obtained when half the volume of a bladder is occupied with water and the other half of the volume is filled with air. When a pool is to be used by relatively heavy persons, more water could be used. If lighter persons will use the pool, the amount of air relative to the amount of water can be increased to achieve comparable performance.
 The freestanding enclosures shown in FIGS.
 It will be appreciated that pool and enclosure systems can be configured in numerous other ways and combinations based on the principles described herein.
 For example, the base and upper rings and vertical supports could, as shown in some of the drawing figures, be made of resilient or less-resilient materials such as PVC, fiberglass, and even non-resilient tubular or solid steel members.
 Although base and upper rings are most often illustrated as being generally circular, such members could have other ring shapes, including polygonal rings such as octagons, hexagons, and rectangles.
 Accessories, such as squirt guns, baskets, ball tubes, lights, and water hoses, can be attached for playing games that teach eye hand coordination, timing, and the like.
 An enclosure system, having one or more inflatable bladders, could also be used to surround a trampoline to provide a protective fence. To avoid fluctuations in firmness of the bladder(s), a mechanical or electrical air pump that operates to inflate the bladder(s) could be powered the bed of trampoline. The trampoline could have more than one bed for greater shock absorption. The trampoline could have a shock surface fixed to top or bottom of its bed(s). Bottom attachment helps prevent injury if bed bottoms out on ground. The trampoline could have cams attached in line with some or all of the springs or elastic members.
 Many of the above-described enclosures could be used with an inflatable trampoline frame of the type that looks like a big inner tube with an elastic top surface for jumping. The inflatable ring that serves as the trampoline frame could be filled with a liquid or a liquid/gas mixture for reasons described above. And poles or tubes could extend upwardly from the frame to serve as enclosure upright members.