Abstract:
A multiple use, light weight, cost-effective, indoor and all-weather outdoor construction toy for stimulating children&#39;s imaginations and encouraging physical activity comprises a basic modular unit with open ended cup-like coupling-means on its perimeter for male to female coupling and decoupling to other couple-able units, is described. The coupling-means may be molded as an integral part forming one seamless basic unit. The open bottom end of the coupling means provides for coupling, the open top end prevents the buildup of snow inside the coupling unit. Coupling can be achieved via coupling-means on basic units to each other or through the use of accessory independent coupler-units. The basic unit of the modular toy may be in the form of a saucer, disc, an oval, or in a rectilinear-shape for use as a sled, skiing device, a flotation device, or as fort building modules. Additional accessory parts include skis and inner-tubes, for example.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This Continuation-in-Part claims the benefit of Non-provisional application Ser. No. 11/413,317 filed on Apr. 28, 2006 
    
    
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not Applicable 
     REFERENCE TO SEQUENCE LISTING, A TABLE OR A COMPUTER PROGRAM LISTING COMPACT DISK APPENDIX 
     Not Applicable 
     BACKGROUND 
     The present invention relates generally to building toys and, more particularly, to indoor and all-season outdoor coupleable/decoupleable modular construction toys. 
     The background information discussed below is presented to better illustrate the novelty and usefulness of the present invention. This background information is not admitted prior art. 
     The market for toys and games is a booming industry in the United States and around the world. Nearly $40 billion dollars each year is spent on the newest and most popular games and toys, and since deregulation of children&#39;s television in 1984, there has been an explosion of multi-media based toys. At least half of all new toys this year are projected to be such toys and it is predicted that this ratio will grow. 
     In addition to multi-media based toys; there is an abundance of electronic games and gadgets aimed at getting a child&#39;s attention. These toys are known to have deleterious effects on children. Many of these toys encourage imitative play that can promote undesirable behavior in children, especially when the toys are based on television shows and movies that promote violence as they often lead children into imitating the violence in their play. 
     SUMMARY 
     The present inventor realized that most the new toys and/or games coming on the market, regardless of how costly, do not hold a child&#39;s interest for long. The Inventor concluded this is due, in part, to the fact that more and more toys are designed for “imitative” play where a child is encouraged to imitate characters made popular by the television shows, movies, and books. Imitative toys present an ordered activity of play that undermine a child&#39;s imagination, creativity, and ability to recognize and appreciate interesting problems to explore and solve. Examples of such ordered activity toys include computer based toys and games that usually result in children sitting passively indoors for hours, instead of being involved in active outdoor play. Moreover, many of these presently available toys are provided with a comprehensive set of game playing rules that leave little room for independent thinking undermining active play and discouraging creativity. The present inventor theorized that a child&#39;s interest in playing with a toy would be extended if the child&#39;s imagination had to be utilized in order to play with the toy. 
     As a parent, who also happens to be trained in the medical field, the present Inventor appreciates the beneficial and therapeutic effects that imaginative play, especially outdoors imaginative play, activity promotes. Physical activity helps children sleep better at night and helps battle the obesity epidemic among America&#39;s youngsters. Moreover, physical activity may help reduce hyperactivity in children. When a child in involved in an activity that requires both mental and physical activity his and her level of independence, resourcefulness, and competence grow, which of course helps the children to develop into positively oriented, creative, and competent adults. 
     The present inventor studied the many attempts to provide toys that encourage active, creative, outdoors play. One set of such toys include inflatable toys and injection molded boats or polyurethane foam floating toys of various shapes for use in water areas, such as in swimming pools or at the beach. Injection molded plastic floating toys while providing some incentive for summer time activity, are not only costly, which seems even costlier in northern climates where their period of use is limited, but their creative stimulation value is minimal at best. A similar situation exits with expensive inflatable winter sledding toys, which can be used only for the snowy months of the year. Moreover, both of these seasonal toys require storage during their “off” seasons and as children physically and developmentally outgrow such toys within a few years, their lifespan is limited. 
     One attempt at providing for a multiple use outdoors toy offers a convertible, floatable toy that can be used either in the water or for downhill sledding and comes is equipped with steering capability and contains interchangeable parts, which include a water propulsion means or ski runners. While this toy has the versatility of use in the water as a floatation device or in the snow as a sled, it serves no purpose as a toy in any other environment. So, while its dual nature may save parents some expense, and while it may encourage children to play outdoors, this device must be used either in water or on snow and only minimally does it encourage a child&#39;s creativity. Additionally, its interchangeable parts offer only two toys for the price of one. 
     Another attempt at providing for an outdoors toy with multiple uses is a multi-season ski sled for use in skiing and sledding. The ski sled is not used for conventional skiing because the user&#39;s feet are not fixed to the ski runners. Instead, the “ski sled” refers to the use of a ski runner for sliding over the snow or the use of ski runners in fixed parallel or tandem relationship. This invention provides a multi-season ski sled that can be used for skiing or sledding because it also has detachably mounted wheel assemblies that convert the ski sled for scooting use. Although this invention may be used on snow or dry land, it cannot be used in the water, and does not require much creativity. 
     Another attempt to fulfill the as yet unmet need is a sled that has a plurality of wheels for use when desired. The sled also has a steering member operatively coupled to at least two of the several pairs of wheels and a hand brake that is attached to the steering member. While this invention is a toy that can serve both as a sled for use on snow or as a sled with wheels for use on dry land or on snow, it cannot be used in the water. 
     Accordingly, the present inventor teaches herein a child&#39;s toy that encourages children to use their imagination while being fun, safe, and durable. The toy is designed to accommodate a growing child&#39;s changing interests and encourages both mental and physical indoor and outdoor activity in all seasons. Moreover the toy provides creative challenging play for children of a range of ages, from young to beyond the teen years. 
     The primary toy devised by the present Inventor consists of a basic modular unit having a body section, a perimeter that is, or approximates being equidistant from the center of the unit, and couplers extending out away from the perimeter, A perimeter is herein described as the continuous path that surrounds an area. The term may be thought of as the length of the outline of a shape. The perimeter of a circular area is called circumference. Hence, as used herein a basic unit having a round shape has a circumference that is equidistant from the center of the unit at all points of the circumference. Basic modular units are also contemplated being shaped as regular polygons, for example as having a perimeter that can be defined as a hexagon, octagon, or a similar shape. A regular polygon is defined as an equilateral polygon which is cyclic, that is its vertices are on a circle and thus all of the vertices are equidistant from the center of the unit. This provides for all basic units having or generally having a perimeter that approximates being equi-dimensional from the center of the unit. 
     The center of each basic unit is depressed to provide a comfortable seating area for the user regardless if the unit is being used with a flotation device or as sled. The depressed seating area helps to secure the user in the sled preventing the sled user from falling off of the sled. 
     The facts that each basic unit is round, or a regular polygon, and that each basic unit has a centrally located depressed seating area results in a weight stable configuration. That is, the weight of the user is kept in the center of the sled, thus stabilizing the user on the sled and also stabilizing the combination of user and sled. 
     Each basic unit may be used as is, that is by itself, but also may be used in conjunction with other basic modular units. Each basic unit has one or more couplers extending out from the equi-dimensional, or nearly equi-dimensional, perimeter of each sled. The couplers are used to attach basic units to other basic units. In the example illustrated, the couplers are male/female couplers designed to be an extension off of the perimeter of the basic unit, in that they are formed as part of the basic unit at the time the basic unit is formed but extend out away from the perimeter of the basic unit. One method of manufacture would be by a molding process. The cup-like shape of the couplers provides for each coupler to be used as both a male and a female coupling unit. 
     Coupling basic units to each other provides children with an array of construction options, such as the ability to build a multi-user sled, a walled fort, and a domed fort similar to an igloo. Two basic units may be coupled to form a side by side couplet sled. Three sleds may be coupled so that they are arranged in a line and can be used as a train or a line of units extending from the right and/or left of another user. Alternatively, three sleds may be coupled so that a line connecting the center points of each of the sleds describes a triangle. The number of sleds that can be coupled is limited only by the number of users and the space available. The sleds may be used in such configurations because each sled and rider is weight stable due to a user being positioned in the center depression of the unit, as discussed above. 
     One series of basic units are sized so that each basic unit fits snuggly, safely, and securely into the open center of any standard sized inflatable, floatable inner-tubes. The fact that the male/female couplers extend out away from the perimeter of the basic unit provide for basic units, even while positioned within an inner-tube to be coupled. In fact a basic unit in an inner-tube can be coupled to another basic unit that is not positioned in an inner-tube. 
     The basic units may be coupled to directly each other, as taught above, or through the use of a separate coupler unit. A coupler unit has a triangularly shaped body with female/male couplers on the apex of each of the three vertices. The female/male couplers of the coupler units are shaped and sized to be used with any of the couplers on any of the other basic units. 
     The fact that each unit has a set of couplers means that the each unit is attachable to various accessories. For example, the invention includes providing for skis that can be used with a basic unit for skiing on either snow or water. Each ski is equipped with one or more couplers that are couple-able to the couplers of a basic unit. 
     When the discs are coupled side by side in a vertical orientation to form a circle, a vertically-walled fort is formed. Basic units may be added to the upper portions of the basic units forming the walls to form a domed fort. 
     Another accessory is a turn-table onto which a basic unit may be attached providing for a spinning toy. Attachable to an accepting aperture of the turntable is a propeller sitting atop a long shaft so that while the bottom of the propeller shaft is fitted into and supported by the accepting aperture of the turntable the propeller extends out above a fort made of basic units. 
     Also available are a collection of accessories that extend the number of ways the basic unit can be used and that provide an endless array of toys that engage the imagination as well as require physical activity from children, such as sliding toys, tricycle toys, and toys with roofs. Such accessory pieces provide children the options of constructing a more complicated domed fort with helicopter or airplane like appendages, a water or snow ski-able device, tricycles, and floatable devices, including water tricycles. The toys are constructed of buoyant, water and weather resistant materials that provide for the toys to be used indoors or out, winter or summer. As taught herein, the toys encourage active play to help children build and maintain physical strength and endurance. According to the principles of the present invention, the toy also encourages contemplation, imagination, and confidence. Its use is open ended, there is no one way a child should be playing with the toy, its use induces imaginative and creative play. Moreover, the toy inspires children to more deeply explore their imaginations to develop their own creative ideas. Furthermore, use of the toy often presents children with various technical problems allowing and encouraging children to explore various ways to resolve the problems. Once the problem is solved, the child is able to experience pride and satisfaction in their successful problem solving. The various ways in which the toy may be used are limited only by the child&#39;s imagination and thus, is likely to maintain a child&#39;s interest. The toy may be used equally well by one child or by a number of children. Importantly, the toy is inexpensive to make, partly because it can be produced by common molding techniques using available and low cost materials, so that it is affordable for all. 
     Still other benefits and advantages of this invention will become apparent to those skilled in the art upon reading and understanding the following detailed specification and related drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order that these and other objects, features, and advantages of the present invention may be more fully comprehended and appreciated, the invention will now be described, by way of example, with reference to specific embodiments thereof which are illustrated in appended drawings wherein like reference characters indicate like parts throughout the several figures. It should be understood that these drawings only depict preferred embodiments of the present invention and are not therefore to be considered limiting in scope, thus, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings, in which: 
         FIG. 1   a  is a top plan view illustrating a basic unit of the toy of the present invention. 
         FIG. 1   b  is a perspective view illustrating a basic unit, as shown in  FIG. 1   a.    
         FIG. 1   c  is a cross-sectional view taken along line  1   c - 1   c  of  FIG. 1   b.    
         FIG. 2   a  is a top plan view illustrating a coupler-unit of this invention. 
         FIG. 2   b  is a partial perspective view of the coupler-unit illustrated in  FIG. 2   a.    
         FIG. 2   c  is a side plan view of the coupler-unit, as illustrated in  FIGS. 2   a  and  2   b.    
         FIG. 3   a  is a top plan view illustrating another style coupler-unit of this invention. 
         FIG. 3   b  is a partial perspective view of the coupler-unit illustrated in  FIG. 3   a.    
         FIG. 3   c  is a side plan view of the coupler-unit, as illustrated in  FIGS. 3   a  and  3   b.    
         FIG. 4   a  is a top plan view of three basic units each coupled to a coupler-unit. 
         FIG. 4   b  is a perspective view of two cup-like coupling-means illustrating how the coupling-means couple. 
         FIG. 5   a  is a top plan view of a basic unit positioned on an inner-tube for use in the water or on the snow or ice. 
         FIG. 5   b  is a top plan view of four basic units each situated on an inner-tube and each coupled to a basic unit not situated on an inner-tube. 
         FIG. 6   a  is a partial perspective view illustrating a top side of a short ski having only one coupling-means. 
         FIG. 6   b  is a partial perspective illustrating a top side of a full length ski having coupling-means on each of its two ends. 
         FIG. 6   c  is a plan view illustrating a bottom side of a short ski having only one coupling-means. 
         FIG. 6   d  is a plan view illustrating a bottom side of a full length ski having a coupling-means on each of its two ends. 
         FIG. 6   e  is a top plan view illustrating a basic unit coupled to an accompanying set of couple-able skis including a set of two full length skis and one short ski. 
         FIG. 7  is a perspective view illustrating six basic units coupled to each other forming a vertically-walled structure. 
         FIG. 8  is a perspective view showing a domed fort constructed from nine basic units coupled to each other. 
         FIG. 9  is a perspective view showing domed fort constructed from thirteen basic units coupled to each other. 
         FIG. 10   a  is a side plan view illustrating a rotable sitting means. 
         FIG. 10   b  is a perspective view of the rotable sitting means as illustrated in  FIG. 10   a.    
         FIG. 11  is a side plan view of the fort as illustrated in  FIG. 8  with the front central basic unit removed to show how a helicopter-like toy is constructed using the rotable sitting means as illustrated in  FIG. 10   a.    
         FIG. 11   a  is a side plan view of a multi-use device. 
         FIG. 12  is a side plan view of the fort as illustrated in  FIG. 9  with front basic unit removed to show how an airplane-like toy is constructed using the rotable sitting means as illustrated in  FIG. 10   a  with gear means. 
         FIG. 13  is a top plan view of a steerable multiple coupled tube-discs sled. 
         FIG. 14   a  is a side plan view of a coupleable tricycle. 
         FIG. 14   b  is a perspective view of coupleable tricycle, as illustrated in  FIG. 14   a.    
         FIG. 14   c  is a top plan view of coupleable tricycle as illustrated in  FIG. 14   a  and  FIG. 14   b.    
         FIG. 14   d  is a plan view of the individual parts used to make the coupleable tricycle, as illustrated in  FIG. 14   a ,  FIG. 14   b , and  FIG. 14   c.    
         FIG. 15  is a side plan view of a water disc-cycle. 
         FIG. 15   a  is a side plan view illustrating the construction used to support seat, to secure first and third inner-tube to the seat, and to support sun-roof basic unit. 
         FIG. 16   a  is a top plan view illustrating yet another style coupler-unit of this invention. 
         FIG. 16   b  is a side plan view illustrating yet another style coupler-unit of this invention, as illustrated in  FIG. 16   a.    
     
    
    
     A LIST OF REFERENCE NUMERALS AND THE PARTS TO WHICH THEY REFER 
     
         
           10  Basic unit of multi-seasonal, multi-use modular construction toy with coupling-means  12 . 
           12  Cup-shaped coupling-means. 
           12   a  Alternative coupling-means. 
           12   c  Aperture within coupling-means  12 . 
           12   d  Aperture within coupling-means  12 . 
           12   e  Aperture within coupling-means  12 . 
           12   k  Aperture within coupling-means  12 . 
           14  Body part of basic unit  10 . 
           16  Upper or sitting surface of  14 . 
           18  Bottom surface of  14 . 
           20  Coupler-unit with three coupler-means  12 . 
           24  Body part of coupler-unit  20 . 
           30  A second styled coupler-unit with alternative coupler-means  12   a.    
           34  Body frame part of coupler-unit  30 . 
           36  Threaded apertures. 
           50  Tube-disc, a basic unit in combination with inner tube. 
           55  Inner tube. 
           55   a  A first inner tube. 
           55   b  A second inner tube. 
           60  Basic unit  10  with skis  64  and  64   s  attached via coupling-means  12 . 
           62  Front side of full length ski with two coupling-means. 
           62   s  Front side of short ski with a coupling-means. 
           63  Back side of full length ski with two coupling-means. 
           63   s  Back side of short ski with a coupling-means. 
           64  Full length ski with coupling-means. 
           64   s  Short ski with a coupling-means. 
           70  A vertically walled structure comprising six coupled basic units. 
           80  A domed structure comprising nine coupled basic units. 
           90  A domed structure comprising thirteen coupled basic units. 
           100  A turn table sitting device. 
           103  An aperture. 
           105  Rotable seating platform of  100 . 
           107  Rotable shaped shaft connecting  105  and  109   a.    
           109  Base part of  100 . 
           109   a  Top part of base part of  100 . 
           109   b  Bottom part of base part of  100 . 
           110  Helicopter-like toy. 
           111  Multi-use device comprising part  122  that may function as part of an oar, paddle, propeller, or support, for example, and shaft part  119 . 
           115  Rotable connecting part for connecting  120  to  117 . 
           119  Long, rod-like shaft. 
           119   a  A first long, rod-like shaft. 
           119   b  A second long, rod-like shaft. 
           120  Airplane-like toy made using  90 . 
           122  Propeller-like curved blades. 
           130  Steerable multiple coupled tube-discs sled. 
           132  Threaded connector means. 
           132   a  Rod shaped connector means. 
           132   b  Coupling connector aperture. 
           133  Coupleable steering bar. 
           135  Coupleable sled. 
           136  Coupleable accessory seat. 
           136   a  Upwardly directed portion of accessory seat  136 . 
           136   b  Coupleable aperture for accepting  136   c.    
           136   c  Coupleable stem for inserting into  136   b.    
           137  Coupleable backrest. 
           139  Coupleable sled attachment means. 
           139   a  Washer for coupleable sled attachment means  139 . 
           139   b  Threaded bolt for coupleable sled attachment means  139 . 
           139   c  Nut for coupleable sled attachment means  139 . 
           140  A coupleable tricycle. 
           142  Rear wheel. 
           142   a  Outside side of rear tire. 
           142   b  Inside side of rear tire. 
           142   c  Threaded axel receiving aperture of rear tire. 
           143  Front wheel. 
           144  Pedals. 
           145  Rear tire axel. 
           146  Steering fork. 
           148  Crank arm. 
           150  Water disc-cycle. 
           160  Another style coupler-unit of this invention. 
           165  Body part of coupler-unit  160 . 
           166  Casting impressions for making snow or ice cube-like toys. 
           170  Central open space in  174  for holding axel and to serve as inlet of water. 
           174  Right side and left side planar wheel cover faces. 
       
    
     It should be understood that the drawings are not necessarily to scale. In certain instances, details which are not necessary for an understanding of the present invention or which render other details difficult to perceive may have been omitted. 
     DETAILED DESCRIPTION 
     Referring now, with more particularity, to the drawings, it should be noted that the disclosed invention is disposed to embodiments in various sizes, shapes, and forms. Therefore, the embodiments described herein are provided with the understanding that the present disclosure is intended as illustrative and is not intended to limit the invention to the embodiments described herein. 
     The present invention is a toy that provides a range of play choices. The fundamental structure on which all variations are based is what we refer to as the basic unit. In one favored embodiment, illustrated herein, a basic unit comprises a disc-shaped saucer that is available in a smaller size to support one child or in a larger size to support several. It is to be understood that the shape and the size of the basic unit may vary, as desired, and that the invention does not reside in either the shape or the size of the units of the present invention. However, the there are some features upon which the invention relies. In order to provide for the maximum amount of stability each basic unit should be either round or have a shape of a regular polygon. All of the vertices of a regular polygon lie on a common circle (the circumscribed circle) which is what is referred to as the perimeter of the basic units as described herein. These shapes all share the fact that either all points on the circumference (the perimeter) of the basic unit or all of the vertices of the perimeter of the basic unit are equidistant from the center point of the basic unit, which is turn provides the seating position of greatest stability for the user on the unit. Additionally, each unit is made to have a depressed center to provide for a comfortable and secure seating area. By itself, the disc-like device may be used as a sled for gliding on surfaces one equates with winter-like weather. The toy, however, is designed to be much more than a simple saucer or sled. For example, it may also be used in conjunction with a floatation device, such as an inner-tube for use either in winter on the snow or in summer on the water, which will be described in more detail below. As such, the fundamental basic unit of the toy may be fully enjoyed by itself. 
     Each fundamental basic toy unit however is provided with coupling means that extend out away from the perimeter of the basic unit so that, when desired, each basic unit may be coupled to other basic units to provide the user with a wide variety of toys. Additionally, the invention includes accessory pieces that further expand the ways the toy may be used. One such accessory is a set of skis where each ski is provided with one or more coupling means that are couple-able with the coupling means on a basic unit. The resulting ski-sled could be used either in winter on the snow or in summer on the water. Furthermore, each of the basic units may be coupled to one or two other basic units to provide for a multi-ski-vehicle toy. Moreover, the basic units may be coupled, either directly, or indirectly using one of a variety of coupling units, to other basic units to provide for a walled or domed forts. 
     Turning now to the drawings,  FIG. 1   a , a top plan view, illustrates basic unit  10  of the modular construction toy of this invention. In this exemplary illustration, basic unit  10  is presented as a saucer-like disc form having a circumferential perimeter. As mentioned, it is to be appreciated that a modular construction toy basic unit according to the principles of the present invention may assume a variety of shapes, as long as the shapes may be described as polygonal to provide maximum stability for a user on the basic unit, has a depressed central seating area, and is available in a variety of sizes.  FIG. 1   a , a planar view, and  FIG. 1   b , a perspective view, illustrate coupling means  12  disposed about and extending out and away from the perimeter of body  14  of basic unit  10 . Coupling means  12  in the example illustrated are male to female couplers providing for coupling and decoupling of the basic unit to like coupling-means of at least one other unit, such as another basic unit or other types of units which will be discussed below. Body  14  comprises an upper sitting surface  16  and bottom surface  18 . The embodiment chosen for illustration presents body  14  in the form of a circular disc, which is but one of many possible styles for the basic unit. The convex disc shape of upper sitting surface  16  provides for a depressed comfortable and secure seat for one or more users. In the example illustrated, the basic unit has a round shape, meaning that all points on the perimeter (the circumference) of the body are equidistance from the center. The centering of a user in a centrally located depressed seating area provides for the user to be in a maximum stable position.  FIG. 1   c , a cross-sectional view, of the basic unit, illustrates clearly that in this embodiment coupling means  12  are molded as an integral part of the basic unit.  FIG. 1   a  and  FIG. 1   b  illustrate eight coupling means positioned proximate to, but extending, out away from the perimeter of the saucer shaped disc. Having the coupling means extending out and away from the perimeter of the body of the unit provides for the modular construction toy basic unit  10  to be linked directly to other like modular construction toy basic units (see  FIG. 4   a ). 
     It is to be understood that the number of coupling means is not confined to eight coupling means; any number desired will be effective. In the examples illustrated, the coupling means are presented as female/male coupling cups  12 . In this embodiment, coupling cups  12  are shown as cups with both their top and bottom ends open. The bottom ends of the coupling means  12  are open to receive other coupling means for coupling purposes. The top ends of coupling means  12  are open to avoid the coupling cups from becoming packed with snow when the toy is used in the snow. 
       FIG. 2   a , a top plan view, and  FIG. 2   b , a partial perspective view, illustrate one embodiment of a coupler-unit according to the principles of this invention. Central coupler body  24  of coupler-unit  20  is illustrated having a triangular polygonal perimeter with coupling-means  12  affixed proximate to but extending our and away from said perimeter, wherein coupling-means  12  provide for male or female coupling and decoupling of said coupler-unit to like coupling-means on at least one other unit provided with coupling means.  FIG. 2   c  a side plan view of the coupler coupling means, illustrates coupling-means  12  molded as an integral part of coupler-unit  20  forming one seamless coupler-unit. As are the coupling means discussed above, the bottom ends of the coupling means  12  of coupler-unit  20  are open to receive other coupling means for coupling purposes. The top ends of coupling means  12  are open to avoid the coupling cups from becoming packed with snow when the toy is used in the snow. 
       FIG. 3   a , a top plan view, illustrates another embodiment of a coupler-unit according to the principles of this invention. Right-angled coupler body frame  34  of coupler-unit  30  has coupling-means  12   a  affixed at and defining each apex, where coupling-means  12   a  provides for male or female coupling and decoupling of said coupler-unit to the cup-like coupling-means found on other coupling units and on the basic units. Unlike the cup-like coupling means described previously, the height of coupling-means  12   a  is limited to the height of coupler frame  34 . Looking down into coupling-means  12   a  in the top plan view of  FIG. 3   a , gives the impression that the coupling-means are open holes because, as can be seen in the side view presented in  FIG. 3   b  the circumference of coupling-means  12   a  increases with depth, whereas in  FIG. 3   c , which is a bottom plan view of the coupler coupling unit, both the bottom circumference line and the top circumference line are seen. As are the coupling means discussed above, the bottom ends of the coupling means  12   a  of coupler-unit  30  are open to receive other coupling means for coupling purposes. Incised into each of the two arms of coupler unit defining the right angle is a threaded aperture  36 . The use for these apertures will become apparent in the discussion of  FIG. 12 . 
       FIG. 4   a , a top plan view, illustrates three basic units  10  each coupled to coupler-unit  20  via coupling means  12  forming a multi-person sled.  FIG. 4   b , a side plan view, provides an enlarged view of two cup-like coupling-means  12  to illustrate how simple it is to couple and to decouple coupling-means. No tools or special skills are required for coupling. One cup-like coupling means is simply placed under or over another cup-like coupling means to couple. To decouple one cup-like coupling means is simply lifted up from or down away from the cup-like coupling means to which it is coupled. Although,  FIG. 4   a  illustrates three basic units  10  coupled via coupler-unit  20  the three basic units  10  could just as easily and rapidly be coupled to each other without the use of coupler-unit  20 . 
       FIG. 5   a , a top plan view, illustrates basic unit  10  snugly situated on an inner-tube  55  providing tube-disc  50  for use in the water or on the snow or ice.  FIG. 5   b , a top plan view, illustrates four basic units  10  each situated on an inner-tube  55  and each coupled directly via coupling means  12  to basic unit  10  not situated on an inner-tube forming a multi-person device for use in the snow or water. 
       FIG. 6   a , a partial perspective view, illustrates a top side  62   s  of short ski  64   s  having only one coupling-means  12 .  FIG. 6   b , a partial perspective, illustrates a top side  62  of full length ski  64  having coupling-means  12  on each of its two ends.  FIG. 6   c , a plan view, illustrates bottom side  63   s  of a short ski  64   s  having only one coupling-means  12 .  FIG. 6   d , a plan view, illustrates bottom side  63  of full length ski  64  having a coupling-means on each of its two ends.  FIG. 6   e , a top plan view, illustrates basic unit  10  coupled to an accompanying set of couple-able skis and including a set of two full length skis  64  and one short ski  64   s  providing for ski-disc  60  that can be used to ski on snow or ice or for water skiing. 
     For indoor and all-season outdoor play, various numbers of basic units  10  may be coupled together to form structures, such as play forts of varying complexity.  FIG. 7 , a perspective view, illustrates six basic units coupled to each other forming vertically-walled structure  70 .  FIG. 8 , a perspective view, illustrates nine basic units coupled to each other to form domed fort  80 .  FIG. 9 , a perspective view, illustrates thirteen basic units coupled to each other to form more complicated domed fort  90 . Each of the structures illustrated in  FIGS. 7-9  are constructed by coupling the coupling means  12  of each basic unit directly to the coupling means of neighboring basic units. The ease by which the coupling and decoupling is accomplished and the light weight of the each of the modules means that even young children are able to build a fort of their imagination. 
       FIG. 10   a , a side plan view, and  FIG. 10   b , a perspective view, illustrate rotatable, turntable-like sitting device  100 , another accessory part of the indoor and all season outdoor coupleable/decoupleable modular construction toy of the present invention. Rotatable sitting device  100  comprises rotable seating platform  105  rotably attached to shaft  107  that is in turn rotably connected to top cover part  109   a  rotably positioned over bottom support part  109   b  of base part  109 . Rotatable sitting device  100  is a sit-on-able variation of a turntable. There are a number of known ways to construct turntables in the art and any of these would work within the principle of the present invention. The uses for rotatable sitting device  100  are limited only by the user&#39;s imagination. One contemplated use is described below. 
       FIG. 11 , which is, in part, a cutaway longitudinal view of the fort illustrated in  FIG. 8  with the front central basic unit removed to provide a view of the inside of the fort, also illustrates rotable sitting device  100  positioned within the fort to construct helicopter-like toy  110 . Rotable sitting device  100  comprises base  109   a , connecting shaft  107 , and rotable seat  105 .  FIG. 11   a , a side plan view, illustrates multi-use device  111  comprising multi-use part  122  that functions as part of an oar, paddle, propeller, or support, for example, and multi-use shaft part  119 . In the embodiment illustrated, there are also accessory parts long rod-like shaft  119  and rear tire axel  145  that, in this instance, are connected to each other, for example, by screwing their reciprocally receiving threaded ends together or alternatively, if desired to be manufactured without threaded parts, by friction fitting the parts to each other. There are many ways to connect such shafts known to those of ordinary skill in the art and, thus, need not be discussed in any further detail here. One end of the two section rod-like shaft is then connected to rotatable sitting device  100  using, for example, receiving threaded aperture  103 . The opposite end of the elongated, the two section rotable shaft is connected to rotable connecting part  115  to which propeller-like blades  122  are also connected. To make the propeller-like blades  122  spin, a child, for example, may simply sit on rotable seating part  105  of rotatable sitting device  100  and use his or her feet to rotate the seat, which turns the two section shaft, which turns part  115 , which turns the propellers. 
       FIG. 12 , a side plan view illustrates airplane-like toy  120  constructed using the fort shown in  FIG. 9 . Several of the front basic units of the fort are removed to provide a view of the airplane propeller driving structure constructed within the interior of the fort. To make the airplane propeller driving structure, the inside surface of a first rear tire  142  is positioned against the inside surface of the first right angle defining arm of coupler-unit  30 , as is illustrated in  FIGS. 3   a ,  3   b , and  3   c , so that the threaded receiving aperture  142   c  of first rear tire  142  is aligned with threaded receiving aperture  36  of the first right angle defining arm of coupler-unit  30 , then the inside surface of a second rear tire  142  is positioned against the inside surface of the second right angle defining arm of coupler-unit  30  so that the threaded receiving aperture  142   c  of second rear tire  142  is aligned with threaded receiving aperture  36  of the second right angle defining arm of coupler-unit  30 . Next, a first end of rear tire axel  145  is rotably connected to rotable sitting means  100  while the second end of rear tire axel  145  is screwed into threaded receiving aperture  36  of first right angle defining arm of coupler-unit  30  and then into threaded receiving aperture  142   c  of rear tire  142 . Similarly, screwed into threaded receiving aperture  36  on the second right angle defining arm of coupler-unit  30 , is a first end of rod-like shaft  119 . Connected to the second end of shaft  119  is rotable connecting part  115  for connecting propeller-like blades  122 . 
       FIG. 13 , a top plan view, illustrates a first, second, and third tube-disc  50  coupled to each other and to coupleable sled  135  to form steerable multiple coupled tube-discs sled  130 . In particular, steerable multiple coupled tube-discs sled  130  comprises a first tube-disc  50  coupled via two coupler-means  12  of first coupler-unit  20  to second tube-disc  50  which is coupled via two coupler-means  12  of second coupler-unit  20  to third tube-disc  50 . Coupleable, steerable sled  135  is coupled to second tube-disc  50  via coupleable sled attachment means  139 . Coupleable sled attachment means  139  comprises washer  139   a , threaded bolt  139   b , and nut  139   c  (illustrated in  FIG. 13   a ). Coupleable steerable sled  135  comprises coupleable accessory seat  136  coupled to first and second full length skies  64  with coupling-means, as described above. The steering of tube-discs sled  130  is accomplished using coupleable steering bar  133  that is coupled to the sled, in this embodiment by screwing steering bar mechanism  133  onto threaded coupleable sled attachment means  139 . A first end of steering bar  133  is adapted to fit into aperture  12   d  of the coupling-means  12  of first coupler-unit  20  that is not being used to couple the first and second tube-discs  50  while a second end of steering bar mechanism  133  is adapted to fit into aperture  12   e  of the coupling-means  12  of second coupler-unit  20  that is not being used to couple the second and third tube-discs  50  so that moving an end of the steering bar in a desired direction directs the movement the tube-disc functionally attached to that end of the steering bar to move in the desired direction. Optional coupleable backrest  137  may be coupled to coupleable accessory seat  136  providing for a more comfortable ride. 
       FIG. 14   a , a side plan view,  FIG. 14   b , a perspective view, and  FIG. 14   c , a top plan view, illustrate yet still another way the accessory parts of the coupleable construction toy of the present invention may be used for creative construction. In this embodiment, the accessory parts provide for the construction of coupleable tricycle  140 .  FIG. 14   d  provides a plan view of the individual accessory parts that are used to make coupleable tricycle  140 . In particular, coupleable tricycle  140  comprises coupleable accessory seat  136  adapted for rotably receiving rear axel  145  onto which is mounted the pair of rear wheels  142 .  FIG. 14   d  illustrates the individual parts used in the construction of the coupleable tricycle, such as threaded axel receiving aperture  142   c  located on the inside side  142   b  of rear wheel  142  opposite outside side  142   a . Optional backrest  137  may be coupled onto the sitting surface of accessory seat  136  by inserting coupleable stems  136   c  into coupleable accepting apertures  136   b . The upwardly directed portion  136   a  of accessory seat  136  supports steering fork  146  of conventional construction to be functionally engaged with steering bar mechanism  133 . Front wheel  143  is of conventional construction in that it includes an axle (not shown) that extends outwardly from both planar wheel cover faces  174  of the extent of the wheel through steering fork  146  to be then bent into a pair of oppositely disposed crank arms  148  that in turn support pedals  144 . Front wheel  143  is constructed to function as a tricycle front wheel and as a water cycle wheel (which will be discussed below), therefore the wheel construction includes a right side planar face  174  wheel cover and a left side planar face wheel cover each having opening or aperture  170  in the center. Aperture  170  serves to receive the axle and also serves as an inlet for water when used as part of the water cycle. Instead of ordinary spokes, front wheel  143  has “water wheel blades”  172  that are constructed and function just as the blades or paddles do on a conventional water wheel, however, the only function “water wheel blades”  172  serve coupleable tricycle  140  is to provide support to the wheel and to the tricycle. 
     Yet still another imaginative construction that can be constructed using the accessory parts already described with the addition of one other part is water disc-cycle  150 , as illustrated in  FIG. 15 . The buoyancy of water disc-cycle  150  is, in part, maintained by a first  55   a , second  55   b , and third inner-tube (third inner-tube is hidden from view behind first inner tube  55   a ). Water disc-cycle  150  comprises accessory seat  136 . Upwardly directed portion  136   a  of accessory seat  136  supports steering fork  146  for functional engagement with steering bar mechanism  133 . Front wheel  143  is of conventional construction in that it includes an axle (not shown) that extends outwardly from both planar wheel cover faces  174  of the extent of the wheel through steering fork  146  to be then bent into a pair of oppositely disposed crank arms  148  that in turn support pedals  144 . Front wheel  143  is constructed to function as a water cycle wheel in addition to a tricycle wheel therefore the construction includes a right side planar face cover  174  and a left side planar face wheel cover  174  (mirror image cannot see in illustration) having an aperture in the center. The aperture serves to hold the axle and as an inlet for water when used as part of the water cycle. Instead of spokes, front wheel  143  has “water wheel blades”  172  (see  FIGS. 14   b  and  14   c ) that are constructed and function just as the blades or paddles do on a water wheel. Peddling pedals  144  in a conventional peddling manner turns water wheel  143  which causes water disc-cycle  150  to be propelled through the water. Opening  170  allows water to be drawn in adding to the amount of water present to turn the wheel. Attached to upwardly directed portion  136   a  of accessory seat  136  via rod shaped connector means  132   a  is rotable shaft  107  that is in turn connected to seating part  105  that is hooked over the second inner-tube to hold the second inner-tube securely to the cycle. Basic disc  10  provides for a sun roof for the user who sits on accessory seat  136 . Basic disc  10  is supported in its sun roof position by three long, rod-like shafts, of which only  119   a  and  119   b  can be seen in the figure.  FIG. 15   a  illustrates the construction used to support seat  136 , to secure first and third inner-tube to seat  136 , and to support sun-roof basic unit  10 . Each end of rear tire axel, which is used as the support for seat  136  is connected to a paddle part  122  via connector attachment means  132 . In particular, the male threaded ends of  145  and  122  and secured into the female threaded accepting part of  132   b  forming not only a support for seat  136 , but providing the curved blades  122  that rests on first inner tube  55  and on not seen third inner tube. Moreover, the threaded ends of parts  132   a  are now in position to be connected to the complementary threaded ends of shaft  119   a  (as a mirror image, and thus not shown, first end of the third shaft is supported by a second propeller-like curved blade that rests on third inner tube) which positions shaft  119   a  to be inserted through the coupling-means  12  to be screwed into the axel accepting aperture  142   c  (as illustrated in  FIG. 14   d ) of rear wheel  142  which is situated on top of basic unit  10  to hold basic unit  10  securely in its place as a sun umbrella. Again, in mirror imagine and thus not shown, there is an identical support on the other side of the device. First shaft  119   a  also serves to keep first inner tube  55   a  fixed to water disc-cycle  150 . A second support for basic disc  10  sun roof is provided by second shaft  119   b  where first end of second shaft  119   b  is supported in coupling connector aperture  132   b  that is fixed about rod shaped connector means  132   a  while second end of second shaft  119   b  is positioned through the apertures of a second coupling cup  12  to provide support for basic disc  10 . Securely tucked in between and supported by second shaft  119   b  and first inner tube  55   a  is second inner tube  55   b , which is also kept securely related to the cycle by rotable shaft  107  that is connected to seating part  105 . Only the rearward half of second inner tube  55   b  is shown so as not to obscure the relationship between second inner tube  55   b  and the cycle parts. Hidden from view in this figure, is third inner tube that is a mirror image of first inner tube  55   a  which also provides support for the opposite side of basic disc  10 . 
       FIG. 16   a  is a top plan view and  FIG. 16   b  is a side plan view illustrating yet another style coupler-unit of this invention. Coupler-unit  160  serves as a bi-coupler having first coupler  12  on a first end of body part  165  and second coupler  12  on a second end of body part  165 . Coupler-unit  160  also serves as a means for making snow or ice cube-like toys. Body part  165  of coupler-unit  160  is provided with a plurality of casting impressions  166  that can be filled with snow or water. In the example illustrated in  FIG. 16   a  the impressions are of a penguin, but they can be of anything desired. Once the snow or water sets or freezes in the cast to form a set of molded impression toys, the molded toys are removed from the casts. The toys can be used in a multitude of ways. One way is for children to throw the toys down a snowy hill to see who can retrieve the largest number of toys as they slide down the hill on their coupleable sled, for example. The toys may be used to play catch, for juggling, or to throw through coupler openings, to give just a few more examples. The toys of this invention are designed to allow and encourage children to use their imaginations. 
     The foregoing description, for purposes of explanation, uses specific and defined nomenclature to provide a thorough understanding of the invention. However, it will be apparent to one skilled in the art that the specific details are not required in order to practice the invention. Thus, the foregoing description of the specific embodiment is presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the precise form disclosed. Those skilled in the art will recognize that many changes may be made to the features, embodiments, and methods of making the embodiments of the invention described herein without departing from the spirit and scope of the invention. Furthermore, the present invention is not limited to the described methods, embodiments, features or combinations of features but include all the variation, methods, modifications, and combinations of features within the scope of the appended claims. The invention is limited only by the claims.