Abstract: Modular structural elements found by cutting, scoring and folding multiple layer corrugated paperboard sheets which can be used singly and in combination in the construction of a building structure.

Abstract: A construction system comprises modules of polygonal shape including elongated rectangles, squares, triangles and trapezoids of stiff sheet material formed with integral interlocking tabs along their margins to permit them to be easily and firmly secured to each other to form three dimension structures. Some of the modules also incorporate interlocking slots for securement to each other. This system is especially adapted to the construction by children of an infinite variety of large structures such as playhouses and the like of sufficient size to permit children to play in them.

Abstract: A toy building which is easily carried and yet which can form a larger size play unit. A first floor part 3 of the building is slidably received within a ground floor part 1. Clip elements 7 include lugs 21 and 23 slidable on rails 19 engage with respective projections 33 and 37 to locate the upper part 3 in its elevated position. The lug 23 is engageable with an upper projection 35 for locating the parts 1 and 3 in their collapsed positions.

Abstract: A toy transport set is disclosed which includes a toy truck having a cab and a trailer for carrying one or more toy vehicles, such as toy cars. The trailer is convertible from a transport configuration in which the trailer is releasably coupled to the cab, into a bridge configuration wherein the trailer forms a bridge having a relatively smoothly curving upper surface over which toy vehicles can move and under which toy vehicles may pass. The trailer has a main body portion with a substantially semi-circular upper exterior surface and a substantially flat bottom surface, and two end portions which are pivotally connected adjacent respective ends of the main portion. The end portions each have a surface having a concave contour matching a portion of the upper surface of the main body portion such that the end portions can be placed in facial engagement with the upper exterior surface of the main body portion.