Sectional three-dimensional model

Abstract

Disclosed herein is a sectional three-dimensional model, which can be assembled by use of an independent single type of pieces without requiring several kinds of pieces having different shapes from one another, and achieve a three-dimensional connection of the pieces. The sectional three-dimensional model includes a plurality of spherical pieces, and each spherical piece includes a pair of coupling recesses symmetrically formed in the spherical piece along a center axis of the spherical piece, and a plurality of coupling protrusions integrally formed at an outer surface of the spherical piece to be arranged in directions perpendicular to the coupling recesses, thereby allowing the plurality of spherical pieces to be connected to one another via insertion of the coupling protrusions into the coupling recesses.

1 . A sectional three-dimensional model comprising: 
 a plurality of spherical pieces, each spherical piece comprising a pair of coupling recesses symmetrically formed in the spherical piece along a center axis of the spherical piece, and a plurality of coupling protrusions integrally formed at an outer surface of the spherical piece to be arranged in directions perpendicular to the coupling recesses, thereby allowing the plurality of spherical pieces to be connected to one another via insertion of the coupling protrusions into the coupling recesses.    
   
   
       2 . The model according to  claim 1 , wherein each coupling protrusion of the spherical pieces, which has a circular cross section, comprises: 
 a semi-spherical end;    an annular locking groove formed at an outer circumference thereof to correspond to a raised locking portion formed at an inner circumference of an associated one of the coupling recesses; and    a stopper formed at a rear side of the locking groove.    
   
   
       3 . The model according to  claim 2 , wherein each coupling protrusion is provided at a root thereof with a notch piece.  
   
   
       4 . The model according to  claim 3 , wherein the notch piece comprises: 
 a plane portion having a quadrilateral cross section provided at the root of the coupling protrusion; and    a pair of symmetrical V-shaped notches formed at upper and lower surfaces of the plane portion.    
   
   
       5 . The model according to  claim 1 , further comprising: 
 one or more connection rods having an elongated bar shape and formed with protuberances at both ends thereof, the protuberances having the same shape as the end of each coupling protrusion of the spherical pieces to be inserted into the selected coupling recesses of two spherical pieces, respectively, for the connection of the two spherical pieces.    
   
   
       6 . The model according to  claim 5 , wherein each protuberance has a semi-spherical shape, and is externally formed with an annular locking groove corresponding to the raised locking portion formed at an inner circumference of the associated coupling recess of-the spherical piece.  
   
   
       7 . The model according to  claim 6 , wherein the protuberance has a slit communicating with the locking groove.  
   
   
       8 . The model according to  claim 5 , wherein the connection rod has a pleated flexible portion formed at a center portion thereof.  
   
   
       9 . The model according to  claim 1 , further comprising: 
 one or more connection pipes each configured to allow the selected coupling protrusions of two spherical pieces to be inserted into both ends thereof, respectively, for the connection of the two spherical pieces.    
   
   
       10 . The model according to  claim 9 , wherein each connection pipe comprises a pair of raised locking portions formed at an inner circumference thereof at positions of both the ends thereof, each locking portion corresponding to the locking groove formed at the outer circumference of the associated coupling protrusion of the spherical piece.  
   
   
       11 . The model according to  claim 10 , wherein the connection pipe further comprises a pleated flexible portion formed at a center portion thereof.  
   
   
       12 . The model according to  claim 9 , further comprising: 
 one or more connectors each comprising protuberances formed at both ends thereof and having the same shape as the end of each coupling protrusion of the spherical pieces, and an annular raised stopper formed at a center portion thereof, thereby being used for the connection of the adjacent spherical pieces as well as for the connection of the adjacent connection pipes.    
   
   
       13 . The model according to  claim 12 , wherein each connector further comprises: 
 a pair of annular first locking grooves formed at opposite sides of the stopper, each first locking groove corresponding to the raised locking portion formed at the inner circumference of the associated coupling recess of the spherical piece; and    a pair of annular second locking grooves formed between the stopper and the respective first locking grooves, each second locking groove corresponding to the raised locking portion formed at the inner circumference of the connection pipe.    
   
   
       14 . The model according to  claim 13 , wherein the connector further comprises slits communicating with the first locking grooves.