A modular building system includes pluralities of regular and short plates and beams, and a plurality of sticks, all of which include symmetrically and equidistantly positioned holes and pins, such that the plates, beams, and sticks are detachably connectable to form construction assemblies. Also disclosed are related reinforced construction members, block-based construction members, and a threaded tubular rivet that includes holes for pins and accepts a screw for securing plates with a bracket and the screw.

Circuit blocks are provided. A circuit block may include a corner section including an outer edge and an inner edge, opposite the outer edge, the corner section including a flexible, conductive material. The circuit block may also include a retainer section configured to electrically couple to a substrate. The inner edge of the corner section and the retainer section may be configured to form an inner region configured to receive and retain a magnet. Associated devices are also provided.

A modular structure for being at least partly submerged in a body of water, is disclosed. The modular structure comprises structure elements and strengthening elements providing structural integrity and flexibility, and can typically be a closed structure like e.g. a tank structure. Further, macro structures comprising attached modular structures are presented. Finally, methods for construction of such structures are disclosed.

As an embodiment of the present disclosure, a connection member of an assembly toy includes: a body formed as a solid figure similar to a rectangular parallelepiped, the body including a circular opening in a center of an upper surface and openings of oval shapes in a left side surface and a right side surface; a leg protruding out of the body through the openings of the oval shapes in the left and right side surfaces of the body; and foot models respectively connected to left and right end portions of the leg.

A modular wing, adapted to be used on a flying device such as a toy airplane, drone, or other small fixed wing flying device, or form a part of a wind turbine or any other apparatus that requires a wing or blade, that is compatible with all block-based toy systems such as LEGO?, DECOOL? or KAZI?. The modular wing is comprised of a series of modular aerodynamic surfaces that may be suitable for manufacture by a low-cost method such as molding or additive manufacturing such as 3D printing, typically but not necessarily from plastic, to form wing sub elements which, when assembled together, form a wing or blade such as an airplane wing or turbine blade. The modular wing may comprise cambered or symmetric wing shapes. The modular wing may be used in a static display model fully flying aerodynamic aircraft, sailing hydrodynamic boat, or aerodynamic functioning turbine.

A modular construction kit includes modular construction blocks, each includes at least one interface face. The interface face includes a recess, a plurality of connection apertures disposed proximate to the edge of the recess, and a circular interface receptacle disposed in the center of the recess. The kit also includes modular construction connectors, each includes two opposite sides, wherein each side including a body, a plurality of connection studs extending outwardly from the body, and a protrusion extending outwardly from the body. Some modular construction blocks include predetermined functions. A modular system block includes at least a processor, storage, and wireless communication.

An assembly unit includes side plate having first coupling member on first side, second coupling member on second side, and third coupling member on each of third and fourth sides, top plate including fourth coupling member and top stud, and bottom plate including fifth coupling member and bottom stud. The first coupling member is engaged with the second coupling member of neighboring side plate. The fourth coupling member is engaged with the third coupling member. The fifth coupling member is engaged with the third coupling member. The first coupling member includes protrusion. The second coupling member includes groove. The protrusion is fitted into the groove of the neighboring side plate. The third coupling member includes thread. Each of the fourth and fifth coupling members includes thread. The fourth and fifth coupling members are engaged with the third coupling member in a screwed manner using the threads.

A ring combination toy includes plural assembling bodies which are ring structures, each having plural first connecting portions; and plural assembling pieces, each having two connecting structures and a bent portion, and the connecting structures are connected by the bent portion to form the assembling piece, and each of the connecting structures has a second connecting portion corresponding to the respective first connecting portion. When the second connecting portions of any one of the assembling pieces is engaged to the first connecting portions of any two of the assembling bodies respectively, the assembling bodies are combined with the assembling pieces. Through the design of different shapes, the young children will not be injured easily while playing the game, and the parents can be assured to let their young children play the game and have fun freely.

A toy building brick system includes a base brick having a cubic shape such that the base brick comprises six outer walls. The base brick has an open interior and each of the outer walls comprises a female receiver such that six female receivers are formed in the base brick. In this manner, the base brick defines an all-female brick. A plurality of inserts is provided and each of the inserts is removably engaged with one of the female receivers such that an outer surface of each of the inserts faces outwardly of the open interior.