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Patent dated Oct. 24;, 1961. 7Thus, any of the elements illustrated in FIGS. 1, 2, 3, 4, 5, 6, 7, g and 12 the secondary projections 22 are of tubular shape, having a cylindrical cavity therein as shown more clearly in the sectional views, FIGURES 3, 5, 7 and 12. The LEGO Brick was first patented in 1958.
Due to some slight further developments of the brick, which were also patented, the term of protection ended not until the early nineties, while the main design elements of tubes and stubs constantly remained until today. A toy building block having a bottom wall, straight side Walls each having an inner surface, said walls encompassing the inner face of said bottom wall, at least two identical primary protuberances extending from the outer face of said bottom wall, at least one secondary protuberance extending from said inner face of said bottom wall and presenting a surface within the region encompassed by the inner surfaces of said side walls, a geometric projection of the peripheries of said primary protuberances normal to the inner face of said bottom wall each being in tangential contact with said surfaces at three points, at least one of said points of contact being with the surface of said secondary protuberance, said tangential contact producing a clamping effect when a primary protuberance of another such block engages the said surfaces.1. In a toy building set, a pair of identical building blocks each comprising a hollow parallelopiped body 'open at one face and having a bottom and four side Walls, primary projections extending normally outwardly from said bottom and arranged in two rows of opposed projections so that two adjacent pairs of said primary projections in each of said rows define a square, and at least one secondary projection on said bottom within the cavity coaxial with the center of one of said squares, the position of said primary projections relative to the walls and the secondary projection being such that a pair of primary projections of one block are clamped between at least one side wall and at least one secondary projection of the other block when said pair of identical blocks are assembled by inserting at least two primary projections of one block into the cavity of the other block.
Each of the secondary projections touches the geometrically projected cross sections of four primary projections. A toy building block according to claim 4 in which the block has eight primary protuberances and three secondary protuberances.FIGURE 12 is a view of a block comprising a square base plate with four projections at the external face, one corner being cut away to show the internal projection.It is also well-known to provide hollow building blocks with internal projections located in the cavity, but in the previously known blocks of thistype the internal projections are arranged co-axially with the primary projections. In 1961, LEGO was awarded its first US patent for "Toy Building Brick."
]FIGURE 6 is a view wherein the two blocks are laterally displaced relative to one another;FIGURE 2 is aplan view in the direction of the open face of a preferred embodiment of the invention in the form of a building block inthe shape of a rectangular parallelepiped of hollow construction with one open face and four side walls;Disclaimer 3,005,282.Gocltfred Kirk Chflstiansen, Billund, Denmark.