Abstract:
Construction units for forming multiple-faced polyhedrons and a wide variety of structural forms. The units are in the form of a circular disk and a link. The disk having concentric rings formed thereon, and further having a threaded female connector on one side and a male connector on the other side. The link is in the form of a ladder-shape having two end clamps for engagement with disk units and other link units.

Description:
BACKGROUND OF THE INVENTION 
     Charles O. Perry disclosed Rhombic Hexahedra Blocks for making Rhombic Dodecahedra in his U.S. Pat. No. 3,611,620, in which geometric toy blocks can be made by fitting four obtuse hexahedra together to have geometric shapes, and however have the following defects: 
     1. Even many shapes of geometric polyhedra can be assembled by assembling several individual polyhedron units different from each other. The production cost for modling the basic units such as cubical hexahedron, rhombic hexahedron or other shapes will be increased. 
     2. Every two neighboring blocks are coupled by pair of stems and spherical end portions. The stems as fixed inside each block may increase their production complexity and each stem may be broken or damaged after repeated services. 
     3. It is difficult to assembly an irregularly shaped toy bokcs such as to mimic an animal, a machine or an article since they are lacking of linear linking elements or rotating elements, so that it is difficult to form diversified vivid gigantic structures. 
     The present invention has found the defects of such a conventional blocks and invented the present block unit for making three dimensional blocks. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide a block unit comprising a circular disk means and a ladder-shaped link means wherein each circular disk means may serve as a point or vertex and each link means may serve as a line section so that a diversified geometric polyhedron or an irregularly-shaped gigantic structure or skeleton can be assembled by assembling a plurality of the disk means and the link means to include geometric points, lines to vividly mimic the true articles or animals and enrich the player&#39;s interest. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a top view of a circular disk means of the present invention. 
     FIG. 2 is a sectional drawing showing a circular disk to be assembled with the other disk in accordance with the present invention. 
     FIG. 3 is an illustration of a ladder-shaped link means of the present invention. 
     FIG. 4 is an illustration showing the assembly of a link means with the other link in accordance with the present invention. 
     FIG. 5 shows still another application for the assembly of several link means of the present invention. 
     FIG. 6 shows the assembly of link means on a circular means of the present invention. 
     FIG. 7 shows a geometric tetrahedron assembled in accordance with the present invention. 
     FIG. 8 shows a helicopter assembled in accordance with the present invention. 
     FIG. 9 shows a star-like plane assembled in accordance with the present invention. 
     FIG. 10 is a partially enlarged illustration showing the assembly of a star plane as shown in FIG. 9. 
    
    
     DETAILED DESCRIPTION 
     As shown in FIGS. 1-3, the block unit of the present invention comprises a circular disk means 1 and a ladder-shaped link means 2, each circular disk means 1 serving as a point or a vertex and each ladder-shaped link means 2 serving as a line section for a geometric shape. 
     Each circular disk means 1 includes an upper female socket 11 formed on a central portion of a central disk portion 10, a lower male screw 12 engageable with female socket 11 of another circular disk 1 and extending downwardly from the central disk portion 10 by a neck portion 13, an inner ring 14 concentric to the center of the central disk portion 10 and secured to the disk portion 10 and extending on both sides of the disk portion 10, a middle ring 15 concentric to the center of the disk portion 10 and extending on both upper and lower sides of the disk portion 10, an outer ring 16 concentric to the center of disk portion 10 outside the inner ring and spaced from the middle ring 15 by an annular groove 18 outside the middle ring and connected to the ring 15 by a pair of radial connectors 17 across the annular groove 18. 
     Each ladder-shaped link means 2 includes a pair of parallel longitudinal bars 22 transversely connected by a central bar 21 perpendicular to the two longitudinal bars 22 and also transversely connected by a pair of side bars 27 each bar 27 positioned on an outer side of the central bar 21 and perpendicular to the two bars 22, having a pair of side clamps 23 disposed on two opposite ends of the two side bars 37. Each side clamp 23 includes an outer notch 24, a middle notch 25 and an inner notch 26 inwardly subsequently formed along a slit 230 recessed from the outermost end of each clamp 23. A pair of intermediate windows 28 are formed on two opposite sides of the central bar 21 each window 28 defined by the two longitudinal bars 22, each side bar 27 and the central bar 21. On the intermediate surface of each longitudinal bar 22, there is formed with corrugations 29 to limit the longitudinal slipping of the assembled links. 
     In FIG. 4, one link means 2 is coupled to the other link 2 by coupling one outer notch 24 of the right link 2 with the other side bar 27 (as shown in dotted line) of the left link 2, and the right link 2 can be further pushed leftwards to deeply couple the left link 2 until the inner notch 26 of the right link 2 engaging with the right side bar 27 of left link 2 (full line). Plural links 2 can be linearly assembled to form a geometric line or line section. 
     In FIG. 5, other styles for assembling the links 2 can be optionally done to form diversified geometric structure or skeleton. Any notch of the link 2 should be able to engage with either central bar 21, or side bar 27 or longitudinal bar 22 in any direction of other link. 
     In FIG. 6, one link 2 can be coupled to the circular disk 1 by engaging the notch 24 or 25 or 26 of the link 2 with the neck portion 13 of the circular disk 1. Another link 2 can be coupled to the radial connector 17 of the circular disk 1. Any notch 24 or 25 or 26 of the link 2 can be engaged with either ring 16 or 15 or 14 for circular movement of each link 2 along the perimeter of each ring. On the outer ring 16, the link 2 having its outer notch 24 engaged with the ring 16 can be either horizontally moved along the ring perimeter (H) or verically moved (V) along the intersection of the ring 16. 
     From the aforementioned, the length of the slit 230 of each link clamp 23 should be long enough to allow all notches 24, 25, 26 operatively engaged with each ring 16 or 15 or 14 of the disk means 1, and should also be long enough so that one inner notch 26 of one link 2 may be deeply engaged with one side arm 27 of the other link 2. 
     By using each disk means 1 as a vertex and each link means 2 as a line section, a geometric shape of a tetrahedron can be assembled as shown in FIG. 7. By the way, other polyhedra such as: six-faced, 8-faced, 12-faced, 20-faced, and other multiple-faced polyhedron can be easily assembled. In FIG. 7 two circular disk means 1 can be overlain together to frictionally pressurize the neighbor link means 1 for stable construction of geometric shape. The coupling of two disks 1 can be adjusted for diversified geometric polyhedra. 
     In FIG. 8, an irregularly-shaped skeleton such as a helicopter can be assembled in which the cabin of the helicopter is composed of a tetrahedron by plural circular disk means 1 and plural link means 2, the rotor blades are formed by engaging three linear assemblies each having three link means 2 fixed on a central circular disk means 1, and the tailrotor is formed by a circular disk means 1 rotatably mounted on a link means 2 which is then secured to the tetrahedron cabin by several linear arrangement of link means 2. 
     As shown in FIG. 9, a star-like plane is formed by assembling plural circular disk means 1 and plural link means 2. Since the link 2 can be optionally engaged with either ring 16 or 15 or 14 of the circular disk 1, the distance between every two neighboring points (circular disk 1) can be conveniently adjusted for smoother connection of the two neighboring circular disks 1. For instance, the center point A is connected to middle point B by a link 2 having the notch 24 of its inner end connected with ring 14 of point A and having the other notch 24 of the outer end connected to ring 14 of point B. Between point B with another point B, the connecting link 2 has its left-end notch 24 connected with the ring 15 of left point B and has its right-end notch 24 connected with the ring 15 of right point B. The link 2, used to connect point B with point C, has its outer notch 24 connected with ring 14 of point B and has its outer notch 24 of the other link end engaged with the other ring 15 of point C. 
     The present invention has advantages superior to conventional geometric blocks such as: 
     1. Each link 2 can be horizontally or vertically rotated along the circular disk 1 to diversify the assembled angles or orientations to easily assembly a compelx geometric shapes or irregular gigantic skeleton so as to vividly form or mimic an article, animal, a machine or other structures for teaching aids, interesting play or decorative uses. 
     2. Only two basic units are required, i.e. a circular disk and a link to thereby reduce production cost of the blocks. 
     3. The basic unit includes only two basic elements which can be easily assembled or played regardless of player&#39;s age.