The invention relates to a modular construction system comprising at least one object and a coupling element releasably connectable to the object, wherein: the object comprises at least one surface with at least one opening, which opening comprises a number of inward extending lips arranged distributed over the periphery of the opening; the coupling element comprises a body with an axial axis arrangeable in the opening, which body is provided along its outer periphery with at least one outward extending locking cam; wherein the coupling element is arrangeable in at least one arranging orientation in the opening of the object, and is rotatable in the opening relative to the object to at least one locking orientation, in which locking orientation the coupling element is locked in an axial direction and a rotational direction. The invention also relates to a coupling element, object and tool intended and configured to form part of such a modular construction system. External elements such as a skin plate, a fabric, a cord or the like can be attached to a structure according to the invention by means of an attaching element with a shank and a widened head, which shank can be inserted releasably into a continuous opening of a coupling element.

An insert-and-twist building block structure includes a connection bar and a connection terminal unit. The connection bar has an end from which a combination projection section extends and has a conic shape. The combination projection section has an external circumferential surface formed with a bead ring including multiple raised beads intermittently arranged in a ring configuration. The connection terminal unit includes a connection terminal having an end inward recessed to form a combination cavity in a conic shape. The combination cavity has an internal circumferential surface formed with a groove ring including multiple recessed grooves intermittently arranged in a ring configuration. The recessed grooves each a middle portion forming a deep trough section and two ends each forming a shallow trough section, and a depth is decreased from the deep trough section toward the shallow trough sections.

A vehicle configured to move through a network of interconnected tubes includes a body, a motor, a motorized wheel, a biasing assembly, and a first element. The motorized wheel directly engages an inner surface of the tubes. The biasing assembly causes the motorized wheel to maintain continuous contact with the inner surface of the tubes during operation. A waist of the vehicle is constrained by an inner diameter (D) of the curved tube, a radius of curvature (R) of the curved tube, and a length (L) of the wheelbase of the vehicle. The waist of the body is sized such that the vehicle can freely move within any of the tubes without getting stuck therein.

A vehicle configured to move through a network of interconnected tubes includes a body, a motor, a motorized wheel, a biasing assembly, and a first element. The motorized wheel directly engages an inner surface of the tubes. The biasing assembly causes the motorized wheel to maintain continuous contact with the inner surface of the tubes during operation. A waist of the vehicle is constrained by an inner diameter (D) of the curved tube, a radius of curvature (R) of the curved tube, and a length (L) of the wheelbase of the vehicle. The waist of the body is sized such that the vehicle can freely move within any of the tubes without getting stuck therein.

Most children's construction sets fail when to comes to providing children with a fast and easy way to build large structures, such as houses and forts. They fail because the methods they use to connect the pieces of the set are not feasible, don't enable the children to build large structure, or quickly damage the pieces themselves. This application represents years of refinement to produce a novel turn-key design that makes it very easy for children to build such structuresor any other large objects they can imagine. The novelty of this approach includes a slotted Connecting Element that users can slip between cutout made in the edges of Planar Elements. The user inserts the Connecting Element, lines up the slots on the element with the edges of two adjacent Planar Elements, and then rotates the Connecting Element approximately 90 degrees to connect said Planar Elements using friction and compression.

A construction teaching set for education. A polyhedral block body has first and second divided members and provided by engaging and assembling of the first and second divided members. Each of the first and second divided members has a rectangular plane, a plurality of rectangular inclined surfaces adjoining sides of the rectangular plane, triangular connectors formed between the adjacent rectangular inclined surfaces, and a plurality of vertical skirts extending from the plurality of rectangular inclined surfaces and the triangular connectors. A connection bar has a protruding fastener at one end or both ends to be selectively connected to one among a first fastening hole passing through the rectangular plane, second fastening holes passing through the plurality of rectangular inclined surfaces, and third fastening holes formed in a pair of the vertical skirts adjoining each other. A coupling unit generates coupling force for the first and second divided members.

A construction system includes at least two building elements provided with one or more cylindrical holes and one or more connection pins having a first end, a second end and a longitudinal axis. The connection pins are configured to be detachably inserted into the holes and hereby connect two adjacent building elements. The connection pins are provided with a first notch extending along the longitudinal axis and a second notch extending along the longitudinal axis, wherein the first notch extends from the first end to a position between the first end and the second end, wherein the second notch extends from the second end to a position between the first end and the second end. The width of the connection pins is larger than the width of the cylindrical holes.

The invention relates to a modular construction system comprising at least one object and a coupling element releasably connectable to the object, wherein: the object comprises at least one surface with at least one opening, which opening comprises a number of inward extending lips arranged distributed over the periphery of the opening; the coupling element comprises a body with an axial axis arrangeable in the opening, which body is provided along its outer periphery with at least one outward extending locking cam; wherein the coupling element is arrangeable in at least one arranging orientation in the opening of the object, and is rotatable in the opening relative to the object to at least one locking orientation, in which locking orientation the coupling element is locked in an axial direction and a rotational direction. The invention also relates to a coupling element, object and tool intended and configured to form part of such a modular construction system. External elements such as a skin plate, a fabric, a cord or the like can be attached to a structure according to the invention by means of an attaching element with a shank and a widened head, which shank can be inserted releasably into a continuous opening of a coupling element.

The invention relates to a coupling element comprising a body with an axial axis arrangeable in an opening of an object, which body is provided along its outer periphery with at least one outward extending locking cam, wherein the body is provided with at least one resiliently movable tongue extending therefrom, to which tongue the locking cam is connected, wherein the at least one tongue is movable inward by a force being exerted thereon.

A vehicle configured to move through a network of interconnected tubes includes a body, a motor, a motorized wheel, a biasing assembly, and a first element. The motorized wheel directly engages an inner surface of the tubes. The biasing assembly causes the motorized wheel to maintain continuous contact with the inner surface of the tubes during operation. A waist of the vehicle is constrained by an inner diameter (D) of the curved tube, a radius of curvature (R) of the curved tube, and a length (L) of the wheelbase of the vehicle. The waist of the body is sized such that the vehicle can freely move within any of the tubes without getting stuck therein.