A CONSTRUCTION BUILDING SET

Abstract: A construction building set comprises a plurality of box-shaped building elements. The building elements comprise a first type of building elements (1) which have a coupling surface (5) with coupling studs on a side, and a second type of building elements (2) with coupling means on one side which are complementary to the coupling studs. The complementary coupling studs (14) comprise a coupling skirt which enclose a plurality of coupling studs on the building element (1) of the first type upon releasable interconnecting of building elements (1, 2) of the first and the second types of elements. The building elements (1, 2) of the first and the second types further have cooperating abutment portions (6; 12, 18) which cooperate through free abutment outside the coupling skirt on the building element (2) of the second type upon interconnecting of the two building elements (1, 2).

Description: A construction building set The present invention relates to a construction building set with building elements having the constructive features described in the introductory part of claim 1. Today, construction building sets of this type are widely known and available, and examples thereof include the Applicant's own construction building sets marketed i.a. under the trade mark DUPLO®. This construction building set is disclosed in US patent No. 3,597,875. It is the object of the present invention to provide a construction building set whereby it is possible to build constructions wherein the couplings between said building elements are capable of resisting substantial impacts from external influences, by means of building elements having coupling means known per se. This object is achieved with the invention since the building elements of the construction building set include building elements having a structure as specified in the characterizing portion of claim 1. If a building element, e.g. in the form of an aeroplane wing, is looked upon as a lever, the fulcrum of the aeroplane wing will move away from a primary coupling area formed by the coupling skirt and the studs. The location of the fulcrum will be determined by a secondary coupling area in the form of the cooperating abutment portions. It is the only object of the cooperating abutment portions to serve as the fulcrum with a view to reducing the ratio between the lever arms, thereby reducing the separation force between the two building elements. The cooperating abutment portion on the building element of the first type constitutes an abutment surface without coupling studs, since the coupling studs in the primary coupling area will be able to provide adequate coupling. In practice, the preferred embodiment will be an injection-moulded plastics element and the top surface will be a plane surface with coupling studs whereas the underside, which is open since the core was withdrawn in connection with the casting operation, will have protruding columns, walls or the like to form the abutment portions of the element. The plane coupling surface with coupling studs will preferably merge with the plane abutment surface via a straight dividing line, the coupling surface and the abutment surface together forming an obtuse angle. In a preferred embodiment, the building element of the second type will have a rectangular coupling surface and two abutment surfaces which are adjacent to each their respective one of two opposite sides of the rectangular coupling surface, and the coupling surface and the two abutment surfaces in combination will form a convex surface on a portion of the building element. This construction is particularly suitable for aeroplane wings since the same element may be used for both the left and the right wings and the coupling is able to resist torsion, bending or flexing of the wing, depending on the respective designs of the primary and the secondary coupling surfaces. If, in addition to coupling studs and complementary coupling means, the building elements are provided with an integral screw whereby a strong coupling between the two elements may be established, an impact between the elements will cause a pulling force to be exerted on the screw. In case the elements are provided with secondary coupling areas as described above, the magnitude of the force exerted on the screw will be reduced whereby the threaded portions of the elements will not suffer any damage, even in case of powerful influences. As described in claim 7, a convex surface is formed on the element of the first type and the obtuse angle will normally be comprised within the range of 120-170°, i.e. the inclined abutment surface will form an angle relative to the imaginary extension of the coupling surface of 10- 60°. Preferred embodiments of the invention will now be described in further detail with reference to the drawings, wherein: Figure 1 is a schematic and perspective view of a preferred embodiment of two separate building elements for a construction building set according to the invention; Figure 2 is a sideview of the building elements illustrated in Figure 1 in their assembled state; and Figure 3 is a perspective bottom view of the building elements described in Figures 1 and 2. Figures 1 and 2 illustrate two building elements 1 and 2 in their separated and assembled states, respectively. The first element 1 has a box-shaped body 3 corresponding to building elements of the construction building set marketed by the Applicant under the trade mark DUPLO®. On the top surface of the body 3, a surface 17 with coupling studs is provided, while the underside comprises an annular coupling skirt and downwardly protruding tubular members which cooperate with the skirt to establish three-point couplings with the coupling studs on a another building element by interconnecting. The building element 1 has three tubular members in its body and in the two outermost tubular members threaded openings 8 are provided to receive screws from another building element whereas the central tubular member is provided with a displaceable screw 9 as seen in Figure 2. Screws of this type are known from the present Applicant's European patent application No. EP-A-612 262. Along the upper longitudinal sides of the body, the building element 1 is provided with two protruding carrier portions 4 for mounting of the building elements 2 which serve as aeroplane wings. The carrier portions 4 each have a coupling surface 5 with four coupling studs. Moreover, each carrier portion 4 has two abutment surfaces 6 which are inclined relative to the coupling surface 5. Centrally in the coupling surfaces 5 a threaded hole 7 is provided. The wing element 2 is also provided with a coupling surface 10 with coupling studs on the top surface and corresponding complementary coupling means on the underside, as will appear from Figure 3. The primary coupling surface on the wing element for coupling with the element 1 is designated by the reference numeral 11, and in this case the edges 14 constitute the coupling skirts. The cooperating abutment surfaces which cooperate through abument outside the coupling skirt 14 upon interconnecting of the two building elements 1 and 2, consist of wall portions 12 which, following interconnecting of the building elements, rest on the inclined abutment surfaces 6 of the second element. Hereby the force influencing the frictional coupling provided by the coupling studs and their complementary coupling means is reduced, thereby allowing the frictional coupling to tolerate more powerful impact acting upon the arm without ensuing separation. This is extremely important when the screw 15 has been screwed home in the hole 7 since the pulling force acting on the screw is reduced whereby the stress imposed on the threaded portions of the screw is reduced.

Claims: C l a i m s 1. A construction building set comprising a plurality of box-shaped building elements, wherein said building elements include: a first type of building elements (1) having a side with a coupling surface (5) with coupling studs, and a second type of building elements (2) provided on one side with coupling means (14) which are complementary to the coupling studs, said complementary coupling means (14) comprising a coupling skirt adapted to enclose a plurality of coupling studs on a building element (1) of the first type by releasable interconnecting of building elements (1,2) of the first and the second types, c h a r a c t e r i z e d in that the building elements (1,2) of the first and the second types are further provided with cooperating abutment portions (6;12,18) which cooperate through free abutment outside the coupling skirt on the building element (2) of the second type upon interconnecting of the two building elements (1,2) . 2. A construction building set according to claim 1, c h a r a c t e r i z e d in that the abutment portions (6;12,18) are shifted from the plane comprising the coupling surface (5) and are disposed at a distance from an imaginary extension of the coupling skirt. 3. A construction building set according to claim 1 or 2, c h a r a c t e r i z e d in that the abutment portion (6) on the building element (1) of the first type forms an abutment surface without coupling studs. 4. A construction building set according to claim 3, c h a r a c t e r i z e d in that the abutment portion (12,18) on the building element (2) of the second type is in the form of protrusions whose tips abut on the abutment surface of the building element (1) of the first type upon interconnecting. 5. A construction building set according to claim 4, c h a r a c t e r i z e d in that the abutment surface (6) on the building element (1) of the first type is substantially plane, and that the coupling surface (5) with coupling studs and the plane abutment surface (6) merge via a straight dividing line (19), the coupling surface (5) and the abutment surface (6) together forming an obtuse angle. 6. A construction building set according to claim 5, c h a r a c t e r i z e d in that the building element (1) of the first type has a rectangular coupling surface (5) and two abutment surfaces (6) which are adjacent to each their respective one of two opposite sides of the rectangular coupling surface (5), and that the coupling surface (5) and the two abutment surfaces (6) together form a convex surface on a portion of the building element (1). 7. A construction building set according to claims 1 through 6, c h a r a c t e r i z e d in that the building element of the first type is provided with a threaded hole, and that the building element of the second type is provided with a displaceable screw within its coupling skirt, said screw being aligned with and screwable into the threaded hole by interconnecting.

Inventors: BROEMSOE PER, OLSEN FLEMMING HOEJBERG, BROEMSOE, PER, OLSEN, FLEMMING, HOEJBERG
Applicants: BROEMSOE PER, INTERLEGO AG, LEGO AS, OLSEN FLEMMING HOEJBERG, BROEMSOE, PER, LEGO A/S, OLSEN, FLEMMING, HOEJBERG
Application year: 1996
Main classification: A63H33
IPC codes: A63H33