the present invention is susceptible of embodiment in many different forms . while the drawings illustrate and the specification describes certain preferred embodiments of the invention , it is to be understood that such disclosure is by way of example only . there is no intent to limit the principles of the present invention to the particular disclosed embodiments . in one preferred embodiment of the invention , a set of blocks includes four different styles of blocks , a full set including multiple copies of each style . as shown in fig1 the four exemplary styles include a stooping man style block 10 , a cup style block 12 , a tripod style block 14 , and a tooth style block 16 . as will be seen , each of these pieces has one - half of a mechanical interfitting connection at one end and one - half of a magnetic coupling at the other end so that the pieces may be joined together in countless combinations and configurations , limited only by the child &# 39 ; s imagination and creativity . the man block 10 comprises an abstractly shaped body having a flat base 18 at one end , a trunk 20 projecting upwardly from base 18 , a reduced dimension neck 22 projecting from trunk 20 , and a head or bulb 24 located at the distal end of neck 22 . trunk 20 tapers very gradually toward neck 22 and is provided with a pair of generally flat opposite sides 26 and 28 , a slightly rounded back 30 , and a slightly rounded front 32 . neck 22 slopes upwardly and forwardly at an oblique angle from the upper end of trunk 20 so as to dispose bulb 24 in forwardly overhanging relationship to the front 32 of the body . bulb 24 is somewhat teardrop - shaped , having its largest width at the upper outboard end thereof while its lower inboard end tapers somewhat symmetrically inwardly to a reduced diameter at the junction with neck 22 . bulb 24 comprises one - half of a mechanical connection formed when bulb 24 is interfitted into a mating component as will be discussed below . the body of man block 10 is integrally molded from a suitable synthetic resinous material such as toy grade polyvinyl chloride , the characteristics and composition of such material being well understood by those of ordinary skill in this art . advantageously , the block 10 may be injection molded and provided with a smooth , solid , yet slightly resilient body . a suitable pigment may be added for increased appeal . a recess 34 in base 18 ( fig2 ) fixedly receives a disc magnet 36 that is secured in place by a suitable layer of bonding material 38 . disc magnet 36 is flush with the exposed surface of base 18 and comprises one - half of a magnetic coupling formed when the bases of two of the blocks are brought into face - to - face engagement with one another . although the magnetic coupling can take several different forms including , for example , a simple magnet in one - half of the coupling and a ferrous metal component in the other half , in one preferred form of the invention the coupling comprises two magnets having mutually opposite polarities . thus , as illustrated in fig7 and 8 , two of the disc magnets 36 a and 36 b comprise the separate halves of a magnetic coupling and are of mutually opposite polarity , each of the magnets having a suitable indication of its polarity such as , for example , a dot 37 on the magnet 36 a and a smooth dot - free surface on the magnet 36 b . it is to be understood that , in accordance with one preferred embodiment of the invention , a number of the man blocks 10 will be provided with magnetic bases that are of one polarity , while another group of the man blocks 10 will be provided with bases of opposite polarity . thus , a pair of the man blocks 10 may be magnetically coupled together at their bases , provided only that one of the bases is positive and the other is negative . depending upon the strength of the magnets used , it may be necessary or desirable to somewhat reduce the weight of the block 10 . this may be accomplished , for example , by providing a void or hollow space ( not shown ) internally of the block , such as within its trunk adjacent the recess 34 . the size and shape of any such recess must be such as to avoid adversely impacting the structural integrity and strength of the product , however . desirably , the strength of the magnets is such as to permit young children to easily disconnect the magnets from one another and yet securely hold a pair of the blocks together . a second piece in the set is the cup block 12 which , like the man block 10 , has one half of a magnetic coupling at one end and one half of a mechanical connection at another end . cup block 12 has a flat base 40 , a trunk 42 projecting upwardly from base 40 that takes the form generally of an asymmetrical cone , a neck 44 of reduced dimensions projecting upwardly from the upper end of trunk 42 , and a cup 46 disposed at the upper distal end of neck 44 . although the surface of trunk 42 is substantially arcuate throughout a full 360 ° degrees thereof , trunk 42 still presents a pair of opposite sides 48 and 50 , a back 52 , and a front 54 . it will thus be seen that the body of cup block 12 leans slightly toward side 48 as neck 44 projects upwardly from trunk 42 at a slight lean angle from side - to - side . additionally , neck 44 leans slightly forwardly at an oblique angle so as to position cup 46 out into overhanging relationship with the front 54 of trunk 42 . cup 46 has a socket 56 that is configured to complementally and matingly receive a connecting bulb such as bulb 24 of man block 10 ( see fig2 , for example ). the configuration of socket 56 is such that bulb 24 is snugly received and held therein when man block 10 and cup block 12 are interconnected , yet bulb 24 is free to rotate within socket 56 such that the rotative positions of the two blocks can be varied with respect to one another . preferably , when bulb 24 is inserted into socket 56 , there is a slight snap fit , achieved in part by the relative configurations of bulb 24 and socket 56 and in part by the nature of the material from which the blocks are constructed . in this respect , it is desirable that such material be slightly compressively resilient so that the walls of cup 46 can yield slightly as necessary to accommodate the bulb 24 as it is inserted into place . like the man block 10 , cup block 12 is integrally molded from a suitable synthetic resinous material such as polyvinyl chloride and has a magnet bonded within a recess such as the magnet 36 and recess 34 . also like the man block 10 , cup block 12 is preferably provided in multiples within a set of the blocks , certain of those cup blocks having magnetic bases of one polarity and others having magnetic bases of the opposite polarity . thus , pairs of the cup blocks 12 can be attached together at their bases 40 when the bases are of opposite polarity . a third style is the tripod block 14 , which has one - half of a magnetic coupling at one end and one - half of a mechanical connection at the other end . the body of tripod block 14 includes a flat base 58 , a generally symmetrically conical trunk 60 projecting upwardly from base 58 , a neck 62 projecting from the upper end of trunk 60 , and a tripod 64 projecting from the distal end of neck 62 . three legs 66 , 68 and 70 diverge from the upper end of neck 62 toward outermost ends that are configured in the shape of bulbs 72 , 74 and 76 respectively . each of the bulbs 72 , 74 and 76 is configured complementally to the socket 56 of cup 46 of cup block 12 such that any selected one of the bulbs 72 , 74 and 76 may be releasably snapped into cup 46 ( see , for example , fig2 ). it will be seen , therefore , that bulbs 72 , 74 and 76 are substantially of the same configuration as the bulb 24 of man block 10 . the two legs 68 and 70 of tripod 64 are offset from one another approximately 180 ° degrees . on the other hand , the third leg 66 is offset from legs 68 and 70 by only approximately 90 ° degrees . moreover , leg 66 is somewhat longer than legs 68 and 70 and projects from neck 62 at a shallower angle than legs 68 and 70 . notwithstanding the fact that leg 66 is longer than legs 68 , 70 and projects at a shallower angle , the outermost ends of bulbs 72 , 74 and 76 lie in a common plane that is close to being parallel with the plane of base 58 . consequently , when tripod block 14 is inverted with its base 58 up and the bulbs of the tripod 64 resting upon a level supporting surface , the base 58 is likewise almost or at least substantially level so as to provide a convenient and stable platform from which to erect variously shaped structures that rise from base 58 . like the previously described blocks , tripod block 14 has a recess in its base that fixedly receives a magnet to which other blocks having bases of an opposite polarity may be attached . it is contemplated that multiples of the tripod blocks 14 will be included in each set of blocks , some having bases of one polarity and others of the opposite polarity such that a pair of the tripod blocks can be magnetically attached together at their bases when opposite polarities are selected . in one preferred form of the invention , legs 66 , 68 and 70 are so configured that tripods 64 of adjacent tripod blocks may be mutually interconnected as shown in fig1 and 27 wherein the legs of one tripod are interdigitated between the legs of the other . preferably , webbing 78 between the various tripod legs is configured , arranged and dimensioned such that when the legs of the two tripods are interdigitated , there is a relatively snug fit therebetween without excessive looseness or relative rotation permitted . the enlarged nature of bulbs 72 , 74 and 76 at the outer ends of legs 66 , 68 and 70 relative to the somewhat narrower inner ends of such legs is helpful in obtaining a light snap fit when the two tripod blocks are forced axially into interfitting engagement with one another . as with the previously described blocks , the tripod style block 14 is preferably integrally molded from a synthetic resinous material such as polyvinyl chloride . in one preferred form , tripod block 14 , like the others , is essentially solid , except perhaps for certain void areas ( not shown ) which may be provided adjacent or at the trunk to provide weight control . the slightly compressively resilient nature of tripod legs 66 , 68 and 70 , coupled with the nature of the material used for tripod block 14 , helps in establishing a snap fit interconnection of a pair of tripods into one another . while in a preferred form of the invention the tripods can be interengaged in any selected one of three rotative positions , it will be appreciated that when the tripods are interengaged with the long legs 66 diametrically opposed to one another , the flat bases 58 of the two interengaged blocks become disposed in substantially parallel relationship to one another . this provides a number of benefits and construction opportunities . the fourth style of block in the set is the symmetrical tooth block 16 which , like the other previously described blocks , is adapted for magnetic coupling at one end and mechanical connection at the other end . the body of tooth block 16 includes a flat base 80 , a generally cylindrical trunk 82 projecting upwardly from base 80 , and a group of axially extending , symmetrical , laterally spaced apart , tapered teeth 84 at the upper end of trunk 82 . in one preferred form of the invention , fourteeth are provided at substantially equally spaced intervals about the circumference of trunk 82 . each tooth 84 tapers to a generally pointed tip 86 that is rounded off or blunted to avoid the presence of a sharp comer . each tooth is somewhat prism - shaped , having an outermost curved face 88 and a pair of generally flat , triangular , upwardly converging inner faces 90 and 92 . notches 94 are defined between the spaced apart teeth 84 . like the previously described blocks , tooth blocks 16 are preferably integrally molded from a synthetic resinous material such as polyvinyl chloride and are substantially solid throughout . furthermore , each is provided with an inset magnet , with certain of the tooth blocks having magnets of one polarity and others having magnets of the opposite polarity so that a pair of the tooth blocks can be attached together magnetically at their bases . in addition , a pair of the tooth blocks can be mechanically interconnected at their opposite ends by inserting the teeth 84 of one block into the notches 94 of the other . in one preferred embodiment , the teeth and notches are so configured that the two blocks do not lock up against axial displacement ; however , they do preclude relative rotation of the blocks due to the interfitting nature of the teeth and notches . various polymeric based compositions are suitable for making the blocks of the present invention . particularly suitable is a composition containing approximately 67 . 00 % by weight suitable polyvinyl chloride resin , approximately 24 . 00 % by weight suitable plasticizer , approximately 3 . 50 % by weight suitable stabilizer , approximately 3 . 50 % by weight suitable epoxy , approximately 1 . 00 % by weight suitable processing addivitves , approximately 0 . 50 % by weight suitable lubricant , and approximately 1 . 00 % by weight suitable modifier . one particularly preferred polyvinyl chloride resin is available from shin - etsu chemical co ., ltd . of tokyo , japan under the trade designation tk - 1000 . one particularly preferred plasticizer is phthalate , such as available under the trade designation jayflex dinp from exxon chemical company . a particularly preferred stabilizer is mark cz 123 available from witco vinyl additives gmbh of lampertheim , germany . a particularly preferred epoxy is epoxidised soya bean oil available from ciba - geigy corporation of tarrytown , n . y . under the trade designation irgaplast 39 or from witco vinyl additives gmbh of lampertheim , germany under the trade designation drapex 39 . the processing additives , lubricant and modifier may be selected from a wide variety of brands and sources , as well known to those skilled in the art . preferably , the material from which the blocks are made has a shore hardness of about 90 to about 95 durometer on the a scale . the abstractly shaped blocks of the present invention can be combined in any number of creative ways to allow and encourage children to express themselves freely . animals , creatures , people , and structures of various shapes and sizes can all be formed , limited only by the imagination . one very simple structure , representing no entity in particular , is illustrated in fig2 to provide but one example of how the blocks of the present invention can be mechanically interconnected or magnetically coupled together , or both . although preferred forms of the invention have been described above , it is to be recognized that such disclosure is by way of illustration only , and should not be utilized in a limiting sense in interpreting the scope of the present invention . obvious modifications to the exemplary embodiments , as 3 hereinabove set forth , could be readily made by those skilled in the art without departing from the spirit of the present invention . the inventor ( s ) hereby state ( s ) his / their intent to rely on the doctrine of equivalents to determine and assess the reasonably fair scope of his / their invention as pertains to any apparatus not materially departing from but outside the literal scope of the invention as set out in the following claims .
a set of toy building blocks has several different basic block shapes with multiple numbers of each shape . each block has a magnetic base at one end that enables the block to be attached magnetically to the base end of another block . further , each block has one - half of a mechanical connection at its other end that is complemental to certain of the connectors on other blocks in the set . the mechanical connectors at one end of the blocks and the magnetic couplings at the other , together with a variety of different shapes , preferably of abstract form , permit a wide variety of toy structures to be created and erected in accordance with the child &# 39 ; s imagination and creativity .