Abstract: The present invention relates to a straightly assembled block comprising engaging assembly means configured in male and female types, first ends of which can be coupled to each other, such that male and female piece blocks can be assembled by connecting the same to each other straightly, and the engaging assembly means are improved such that wear is prevented in spite of repeated separation/coupling, thereby maintaining continuous assembly power. To this end, the male and female piece blocks have engaging assembly means, first ends of which protrude in arc shapes, and the second ends of which are coupled to each other. Alternatively, connecting blocks have engaging assembly means formed on both ends thereof in different types. The engaging assembly means formed on the piece blocks or on the connecting blocks comprise a recessed portion and a protruding portion.

Abstract: The present disclosure relates to a chain block toy assembled by interconnecting multiple assembly blocks in a fitting manner by using a female coupling part and a male coupling part. In particular, in each of the assembly blocks provided with a plurality of female coupling parts defined by a partition, an open groove is formed in the partition for forming the plurality of female coupling parts such that, when coupling or decoupling a male coupling part or rotating same in a coupled state, vertical supports of the female coupling parts are rolled to the left and right sides, thereby facilitating the coupling and decoupling, while preventing abrasion by minimizing friction.

Abstract: A wheel for a prefabricated toy using a chain block is provided. The wheel is formed by assembling a wheel assembly, and a drum into which an assembling piece of the chain block is inserted and assembled, and in which the drum has a sill formed at a cylindrical body such that the drum and the wheel assembly are assembled to spin with no traction while the drum is inserted into and assembled to a mounting hole of the wheel assembly, coupling parts having a polygonal shape are formed at both surfaces of the cylindrical body of the drum so as to be simply assembled regardless of an assembling angle of the assembling piece and the wheel, and the wheel itself is utilized as the assembling piece or the drum embedded in the wheel is separated to be utilized as the assembling piece.