# Patent

## Title
Toy building blocks

## Abstract

The invention relates to a toy building block system (100) comprising one or more building blocks (200); and one or more wheels (300); wherein each said building block (200) comprises:
a first elongate portion (2) extending in a longitudinal direction (X); a second elongate portion (4) extending in said longitudinal direction (X); an intermediate portion (6) connecting said first elongate portion (2) with said second elongate portion (4) at a middle position (8) thereof; a first end portion (10) extending in a transverse direction (Y), perpendicular to said longitudinal direction (X), from said first elongate portion (2), at a side thereof opposite to said intermediate portion (6), and at a middle position thereof;

a second end portion (12) extending in said transverse direction (Y), perpendicular to said longitudinal direction (X), from said second elongate portion (4), at a side opposite to said intermediate portion (6), and at a middle position thereof;

said building block thereby comprises six protrusions (14) and two voids (16), wherein each void (16) is being defined between an end of said first elongate portion (2) and an end of said second elongate portion (4).

wherein each said wheel (300) comprises a hub (18); and a wheel rim (20);

wherein said wheel rim (20) is surrounding said hub (18); and wherein said wheel rim (20) is being attached to said hub (18) in such a way that said wheel rim is configured to be able to swivel around a rotational axis (A) in relation to said hub;

wherein said hub (18) at a centre (22) thereof comprises a hole (24) extending in an axial direction (A); wherein the dimensions and geometry of said hole (24) are adapted to the dimensions and geometry of one of said protrusions (14) of said building block (200); so as to be able to accommodate said protrusion (14) and thereby hold said protrusion (14) of said building block (200) in place in said hole (24) of said hub (18) solely by friction.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a U.S. national stage application under 35 U.S.C. § 371(c) of International Application No. PCT/DK2020/050191, filed May 20, 2020, which claims priority to Danish Patent Application No. PA201901155, filed Oct. 2, 2019 and entitled “Toy Building Blocks”, the entire content of which is incorporated by reference herein.
FIELD OF THE INVENTION
The present invention relates in general to the field of toys. More specifically, the present invention relates in a first aspect to a toy building block system. In a second aspect the present invention relates to the use of such a toy building block system for activation of children.
BACKGROUND OF THE INVENTION
For decades, toy building blocks have been available on the market. Toy building blocks represent elements of various geometrical forms and shapes which can be put to together in one or more ways so as to construct a final creation.
When a child makes the decision that he or she wants to build, say a house from a plurality of building blocks, the child will be intellectually challenged because he or she will have to figure out how a number of small building blocks can be put together in order to end up as something resembling a house. At the same time, the child will learn that putting effort into a project can lead to achievement of a result, and the child will feel the satisfaction of having achieved a result which he or she can admire and be proud of. Thereby, the child will also be taught that patience may be necessary before one can obtain the rewarding feeling of being proud of one's achievement.
Moreover, the child will experience training of motorically skills because he or she will have to coordinate the motions of his or her hands in order to put together the building blocks.
Accordingly, for these reasons, toy building blocks are considered to represent a valuable educational, intellectually stimulating toy which as the same time aids in training small children's fine motorically skills.
A vast variety of toy building blocks are known. These range from types of building blocks being present in a single geometrical shape only to being present in a few slightly modified geometrical shapes. Other types of toy building blocks comprise a system of building blocks which exist in hundreds or even thousand different geometrical shapes.
An example of the latter type of toy building blocks is Lego®. Examples of the former type of building blocks are Plus-Plus®, Kapla and Incastro®.
Whereas, the latter type of building blocks may not to a maximum extent challenge the imagination of the child because the set of building blocks already may comprise prefabricated building blocks resembling a window, a door, a roof tile and so on and so forth, the former type to a greater extent challenges the child's imagination, because the individual building blocks does not resemble anything else than a building block and the child himself/herself will have to put the individual blocks together so as to make the combination look like familiar items.
As already mentioned, one example of building blocks of the former type is marketed as Plus-Plus®. This building block comprises a three-dimensional element comprising two vertical bars and one horizontal cross-bar fused into the two vertical bars, wherein each vertical bar, at a position facing away from the horizontal cross-bar, and at a midpoint of that vertical bar, additionally comprises a protrusion having an extension corresponding to 1⁄3 of the height of one of the vertical bars.
The Plus-Plus® building block thereby comprises a total of six protrusions (two in respect of each vertical bar and the two horizontally protrusions) and two voids (between upper parts of vertical bars and lower parts of the vertical bars, respectively).
As the dimensions of each void is adapted to the dimension of each protrusion, two similar Plus-Plus® building blocks can be put together and held in place solely by virtue of friction by squeezing a protrusion of one building block into a void of another building block.
Accordingly, the fact that the Plus-Plus® building blocks, in themselves, do not resemble any familiar everyday item, allows them to become combined with other similar building blocks so as to create various geometrical shapes, figures, structures or creations.
However, although the Plus-Plus® building block is very simple in its design, yet still allowing to be combined with similar building blocks so as to create various geometrical shapes, figures, structures and creations, the functional features of the Plus-Plus® building block is nevertheless rather restricted, especially in terms of allowing individual building blocks to move in relation to other individual building blocks in a combined creation of Plus-Plus® building blocks.
It is an objective of the present invention to create a toy building block system with improved functionality.
BRIEF DESCRIPTION OF THE INVENTION
This objective is fulfilled according to the first and the second aspect of the present invention. Accordingly, the present invention in its first aspect relates to a toy building block system comprising:

    
    
        one or more building blocks; and
        one or more wheels;

wherein each said building block comprises:

        a first elongate portion extending in a longitudinal direction X;
        a second elongate portion extending in said longitudinal direction X;
        an intermediate portion connecting said first elongate portion with said second elongate portion at a middle position thereof;
        a first end portion extending in a transverse direction Y, perpendicular to said longitudinal direction X, from said first elongate portion, at a side thereof opposite to said intermediate portion, and at a middle position thereof;
        a second end portion extending in said transverse direction Y, perpendicular to said longitudinal direction X, from said second elongate portion, at a side opposite to said intermediate portion, and at a middle position thereof;
        said building block thereby comprises six protrusions and two voids, wherein each void is being defined between an end of said first elongate portion and an end of said second elongate portion.

wherein each said wheel comprises:

        a hub; and
        a wheel rim;

wherein said wheel rim is surrounding said hub; and wherein said wheel rim is being attached to said hub in such a way that said wheel rim is configured to be able to swivel around a rotational axis A in relation to said hub;

wherein said hub at a centre thereof comprises a hole extending in an axial direction A; wherein the dimensions and geometry of said hole are adapted to the dimensions and geometry of one of said protrusions of said building block; so as to be able to accommodate said protrusion and thereby hold said protrusion of said building block in place in said hole of said hub solely by friction.

    
    


In a second aspect the present invention relates to the use of a toy building block system according to the first aspect for activation of children.
The present invention in its various aspects provides for a simple building block system made up a few different component which yet allows a variety of combinations, and thereby in an easy and cost efficient manner, in terms og production cost, will represent a valuable educational and intellectually stimulating toy for children.



BRIEF DESCRIPTION OF THE FIGURES
FIG. 1a is a perspective view illustrating the prior art toy building block marketed as Plus-Plus®.
FIG. 1b is a perspective view of the toy building block of FIG. 1a illustrating that this block can be geometrically considered as constituting nine cubes fused together as an coherent entity.
FIG. 2 is a perspective view illustrating a sculpture in the form of a figurine made up of a plurality of the building blocks illustrated in FIG. 1a. 
FIG. 3 is a perspective view illustrating a toy building block system according to the present invention comprising the prior art toy building block of FIG. 1a in combination with a wheel.
FIGS. 4a and 4b are perspective views illustrating a wheel of the toy building block system according to the present invention.
FIGS. 5a and 5b are plan views illustrating a wheel of the toy building block system according to the present invention.
FIGS. 6a and 6b are cross-sectional views illustrating a wheel rim of a wheel of the toy building block system according to the present invention.
FIG. 7 is a plan view illustrating a hub of a wheel of the toy building block system according to the present invention.
FIG. 8 is a perspective view illustrating a creation made up of a plurality of the building blocks and four wheels according to the present invention.
FIG. 9 is a perspective view illustrating another toy building block system according to the present invention comprising the system of FIG. 3 in combination with a base plate.
FIG. 10 is a plan view illustrating the base plate of FIG. 9.
FIG. 11 is a perspective view illustrating a creation in the form of a toy vehicle made up of a plurality of the building blocks and four wheels and a base plate according to the present invention.
FIG. 12a is a cross-sectional view of a disassembled state of another embodiment of the wheel of the toy building block system according to the present invention.
FIG. 12b is a cross-sectional view of the assembled wheel shown in FIG. 12a. 
FIG. 13 is a perspective view illustrating a preferred embodiment of a first or second hub part of the wheel of a of the toy building block system according to one embodiment of the present invention.
FIG. 14 is a plane view showing the outside surface of the embodiment of FIG. 13.
FIG. 15 is a perspective view illustrating a preferred embodiment of the wheel rim of the wheel of a of the toy building block system according to one embodiment of the present invention.



DETAILED DESCRIPTION OF THE INVENTION
The First Aspect of the Present Invention
The present invention in its first aspect relates to a toy building block system comprising:

    
    
        one or more building blocks; and
        one or more wheels;

wherein each said building block comprises:

        a first elongate portion extending in a longitudinal direction X;
        a second elongate portion extending in said longitudinal direction X;
        an intermediate portion connecting said first elongate portion with said second elongate portion at a middle position thereof;
        a first end portion extending in a transverse direction Y, perpendicular to said longitudinal direction X, from said first elongate portion, at a side thereof opposite to said intermediate portion, and at a middle position thereof;
        a second end portion extending in said transverse direction Y, perpendicular to said longitudinal direction X, from said second elongate portion, at a side opposite to said intermediate portion, and at a middle position thereof;
        said building block thereby comprises six protrusions and two voids, wherein each void is being defined between an end of said first elongate portion and an end of said second elongate portion.

wherein each said wheel comprises:

        a hub; and
        a wheel rim;

wherein said wheel rim is surrounding said hub; and wherein said wheel rim is being attached to said hub in such a way that said wheel rim is configured to be able to swivel around a rotational axis A in relation to said hub;

wherein said hub at a centre thereof comprises a hole extending in an axial direction A; wherein the dimensions and geometry of said hole are adapted to the dimensions and geometry of one of said protrusions of said building block; so as to be able to accommodate said protrusion and thereby hold said protrusion of said building block in place in said hole of said hub solely by friction.

    
    


The toy building block system according to the first aspect at least comprises two different elements. The first element is in the form of a building block in the form of a fixed structure having no components being able to move in relation to other components.
The other element, on the other hand is in the form of a wheel comprising a hub and a wheel rim which are configured to be able to swivel in relation to each other (by application of an external force, such as by the action of a human hand).
With a plurality of such building blocks and wheels a huge amount of different combinations in the form of different structures can be build.
It should be noted that in the present description and in the appended claims the element of the toy building block system denoted as a “wheel” in general may be considered as a bearing allowing one part of a structure made from the inventive system to rotate in relation to another part of that structure.
In an embodiment of the toy building block system according to the first aspect of the present invention, the distance between the first elongate portion and the second elongate portion, in a transverse direction Y, corresponds to the extension in a longitudinal direction X or to the extension in a height direction Z of said first and/or of said second end portion; said height direction Z being perpendicular to said longitudinal direction X and to said transverse direction Y.
In an embodiment of the toy building block system according to the first aspect of the present invention the intermediate portion is having an extension in said longitudinal direction X of unit size=1; wherein said first end portion is having an extension in said longitudinal direction X of unit size=1; and wherein said first elongate portion is having an extension in said longitudinal direction of unit size=3; and wherein said second elongate portion is having an extension in said longitudinal direction of unit size=3.
In an embodiment of the toy building block system according to the first aspect of the present invention the intermediate portion is having an extension in said transverse direction Y of unit size=1; wherein said first end portion is having an extension in said transverse direction Y of unit size=1; and wherein said first elongate portion is having an extension in said transverse direction Y of unit size=1; and wherein said second elongate portion is having an extension in said longitudinal direction X of unit size=1.
In an embodiment of the toy building block system according to the first aspect of the present invention the intermediate portion is having an extension in a height direction Z of unit size=1; wherein said first end portion is having an extension in said height direction Z of unit size=1; and wherein said first elongate portion is having an extension in said height direction Z of unit size=1; and wherein said second elongate portion is having an extension in said height direction Z of unit size=1; said height direction Z being perpendicular to said longitudinal direction X and to said transverse direction Y.
In an embodiment of the toy building block system according to the first aspect of the present invention the above mentioned unit size is selected from the ranges of 0.2-40 cm, such as 0.4-35 cm, e.g. 0.5-30 cm, such as 1-25 cm, e.g. 2-20 cm, for example 3-18 cm, such as 4-17 cm, for example 5-16 cm, such as 6-15 cm, e.g. 7-14 cm, such as 8-13 cm, 9-12 cm or 10-11 cm.
In an embodiment of the toy building block system according to the first aspect of the present invention the first elongate portion, the second elongate portion, the intermediate portion, the first end portion and the second end portion are being present as an integrated, coherent entity.
In an embodiment of the toy building block system according to the first aspect of the present invention the geometry of the building block is selected in such a way that the building block geometrically is having an outer shape corresponding to nine cubes being fused together to a coherent entity.
In an embodiment of the toy building block system according to the first aspect of the present invention one or more of said building blocks is/are being a toy building block of the type which prior to the priority date of the present patent application has been marketed as a Plus-Plus® toy building block or as a Plus-Plus® MINI toy building block or a Plus-Plus® BIG toy building block.
The above geometries and dimensions of the building block have proven to be appropriate for the intended use.
In an embodiment of the toy building block system according to the first aspect of the present invention the first elongate portion, second elongate portion and the intermediate portion, the first end portion and the second end portion, and thereby said building block is being made from a polymeric material, such as poly ethylene (PE), poly propylene (PP) or acrylonitrile butadiene styrene polymer (ABS); and/or wherein said wheel rim and/or said hub of said wheel is/are being made from a polymeric material, such as poly ethylene (PE), poly propylene (PP) or acrylonitrile butadiene styrene polymer (ABS).
These materials have proven suitable for use as a toy building block.
In an embodiment of the toy building block system according to the first aspect of the present invention the hole in the hub one or more of said wheels is independently being a through-going hole or a non-through-going hole.
In an embodiment of the toy building block system according to the first aspect of the present invention the wheel rim along an end surface thereof comprises one or more holes extending in an axial direction A; wherein the dimensions and geometry of said one or more holes of said wheel rim is/are adapted to the dimensions and geometry of one or more protrusions of said building block; so as to be able to accommodate and hold said protrusion and thereby said building block in place in said wheel rim solely by friction.
As mentioned, providing such holes in the wheel rim allows for attaching a building block to said hole. Thereby further combinations of putting together elements of the toy building system is possible.
In an embodiment of the toy building block system according to the first aspect of the present invention the wheel rim along an end surface thereof comprises one or more holes extending in an axial direction A; wherein the dimensions of said one or more holes of said wheel rim is/are smaller than the dimensions of the hole in said hub.
Hereby it is possible to attach a building block to said hole in the wheel rim, wherein that specific building block is smaller than a building block having a protrusion which fits the hole in the hub of that wheel. Thereby even further combinations of putting together elements of the toy building system is possible.
In an embodiment of the toy building block system according to the first aspect of the present invention the holes of said wheel rim are arranged in 1, 2, 3, 4 or five groups of 1, 2 or 3 holes, such as in four groups of two holes, wherein said four groups are arranged along said surface of said wheel rim at an equiangular spacing of 90°.
In an embodiment of the toy building block system according to the first aspect of the present invention the distance between two adjacent holes in each group of holes corresponds to the distance, in a transverse direction, between the first elongate portion and the second elongate portion of said building block.
Hereby the two protrusions of the first end portion and the second end portion, respectively can be accommodated in such a pair of holes.
In an embodiment of the toy building block system according to the first aspect of the present invention the wheel rim at a surface facing the axial axis A thereof comprises one or more circular recesses extending into said wheel rim; and wherein said hub at a surface facing away from said axial axis A comprises a corresponding number of protrusions extending away from said axial axis A; wherein the dimensions and geometry of said wheel rim are adapted to the dimensions and geometry of said hub in such a way that said wheel rim is being able to swivel around said hub when said wheel rim is attached to said hub.
In an embodiment of the toy building block system according to the first aspect of the present invention the hub at a surface facing away from the axial axis A thereof comprises one or more circular recesses extending into said hub; and wherein said wheel rim at a surface facing said axial axis comprises a corresponding number of protrusions extending towards said axial axis A; wherein the dimensions and geometry of said wheel rim are adapted to the dimensions and geometry of said hub in such a way that said wheel rim is being able to swivel around said hub when said wheel rim is attached to said hub.
These two embodiments represent simple ways of making the wheel rim swivel around the hub.
In an embodiment of the toy building block system according to the first aspect of the present invention the hub comprises a first hub part and a second hub part; wherein said first hub part comprises one or more of a first engagement means extending in an axial direction from a side thereof, and wherein said second hub part comprises one or more of a second engagement means extending from a side thereof; wherein said wheel rim comprises a central through-going hole; wherein said through going hole is having a first diameter at the central part of said through-going hole, and wherein said through-going hole is having a second diameter at the side of said wheel rim; wherein the first diameter is smaller than the second diameter; wherein the diameter of the first hub part essentially corresponds to the second diameter of the wheel rim, and wherein the diameter of the second hub part essentially corresponds to the second diameter of the wheel rim; wherein one or more of said first engagement means of said first hub part is being configured to enter into engagement with one or more of said second engagement means of said second hub part, thereby allowing to sandwich the wheel rim between the first hub part and the second hub part and releasable lock the first hub part and the second hub part together.
Accordingly, in this embodiment each wheel comprises a wheel rim and two hub parts.
It should be noted that the diameter of the first and the second hub part should have a magnitude that allows for accommodating these hub parts in the through-going hole of the wheel rim at the outer surface of said wheel rim and having said second diameter, yet allowing the first and the second hub part to swivel in that through-going hole, once being engaged into engagement with each other.
In an embodiment of this embodiment the number of said first engagement means of said first hub part, and/or the number of said second engagement means of said second hub part independently is being 1, 2, 3, 4, 5, 6 or more.
Hereby the fastening of the two hub parts to each other is secured.
In an embodiment of the toy building block system according to the first aspect of the present invention the first engagement means of said first hub part comprises an end element protruding in a direction perpendicular to an axial direction of said first hub part; and said second engagement means of said second hub part comprises an end element protruding in a direction perpendicular to an axial direction of said second hub part.
In an embodiment of the toy building block system according to the first aspect of the present invention and in respect of one or more of said engagement means, said end element is/are protruding in a direction perpendicular to an axial direction of said first or second hub part and away from or towards a central axis of said first or second hub part.
In the above two embodiments, the end elements further improve securing of the first hub part to the second hub part.
In an embodiment of the toy building block system according to the first aspect of the present invention the first hub part comprises two first engagement means each comprising an end element protruding in a direction perpendicular to an axial direction of said first hub part and away from a central axis of said first hub part; and wherein said first hub part comprises two first engagement means each comprising an end element protruding in a direction perpendicular to an axial direction of said first hub part and towards a central axis of said first hub par; and wherein said second hub part comprises two second engagement means each comprising an end element protruding in a direction perpendicular to an axial direction of said second hub part and away from a central axis of said second hub part; and wherein said second hub part comprises two second engagement means each comprising an end element protruding in a direction perpendicular to an axial direction of said first hub part and towards a central axis of said second hub part.
In this embodiment of the toy building block system, the end elements further improve securing of the first hub part to the second hub part.
In one embodiment and in respect of the first hub part two identically oriented first engagement means are arranged opposite to each other on said first hub part; and in respect of the second hub part two identically oriented second engagement means are arranged opposite to each other on said second hub part.
In an embodiment of the toy building block system and in respect of the first hub part and in respect of the second hub part, the four engagement means are equiangular spaced by an angle of 90°.
In an embodiment of the toy building block system the radial position of said first engagement means on the side of said first hub part is different from the radial position of said corresponding second engagement means on the side of said second hub part with which the first engagement means is/are to enter into engagement with.
This embodiment ensures the engagement of the engagement means of the first hub part with the engagement means of the second hub part.
In an embodiment of the toy building block system the first hub part and the second hub part of the wheel are geometrically and dimensionally similar.
Such a design provides for a more simple toy building block system.
In an embodiment of the toy building block system according to the first aspect of the present invention the one or more holes in the wheel rim of one or more wheels is/are a through-going hole or non-through-going hole.
In an embodiment of the toy building block system according to the first aspect of the present invention two or more of said building blocks, preferably all toy building blocks of said system are having similar dimensions.
In an embodiment of the toy building block system according to the first aspect of the present invention the two or more of said building blocks are having different dimensions, such as comprising two or more groups of building blocks, wherein the dimensions of the building blocks of one group is different from the dimensions of the building blocks of another group.
Providing the building blocks in two or more sizes provides for more possible ways of putting together building blocks in the creation of a structure thereof.
In an embodiment of the toy building block system according to the first aspect of the present invention the toy building block system comprises building blocks and/or wheels of different colours.
In an embodiment of the toy building block system according to the first aspect of the present invention the toy building block system further comprising a base plate, wherein said base plate comprises an array of holes extending into said plate, said array of holes are arranged at a surface of said plate in two perpendicular directions;
wherein one or more of said holes is/are having dimensions and geometries which are adapted to the dimensions and geometry of one of said protrusions of said building block;
wherein the distance between any two nearest and adjacent holes in said base plate corresponds to the distance, in a transverse direction, between the first elongate portion and the second elongate portion of said building block; so as to be able to accommodate said protrusions and thereby hold said building block in place in said base plate solely via friction.
Providing the toy building system with a base plate allows for putting together elements of the building block system in even more different combinations.
In an embodiment of the toy building block system according to the first aspect of the present invention the base plate is having an extension in a longitudinal direction and an extension in a transverse direction, said longitudinal direction being perpendicular a transverse direction, wherein said array of holes are arranged in said base plate along said longitudinal direction and said transverse direction so as to form a regular pattern of holes.
In an embodiment of the toy building block system according to the first aspect of the present invention the base plate comprises 2-75 holes, such as 5-70, for example 10-65, such as 15-60, for example 20-55, e.g. 25-50, such as 30-45 or 40-45 holes along one or more lines extending in a longitudinal direction.
In an embodiment of the toy building block system according to the first aspect of the present invention the base plate comprises 2-75 holes, such as 5-70, for example 10-65, such as 15-60, for example 20-55, e.g. 25-50, such as 30-45 or 40-45 holes along one or more lines extending in a transverse direction.
In an embodiment of the toy building block system according to the first aspect of the present invention the base plate is having an outer perimeter forming a rectangle, such as a square or forming a triangle, a pentagon, a hexagon, a heptagon, an octagon, or forming a circle or forming an oval shape.
In an embodiment of the toy building block system according to the first aspect of the present invention the one or more holes of said base plate independently are being through-going holes or non-through-going holes.
These geometries of the base plate are suitable for use in a toy building system.
In an embodiment of the toy building block system according to the first aspect of the present invention the number of building blocks independently is selected from the ranges 2-1000 or more, such as 5-900, for example 10-800, such as 20-700, e.g. 20-700, such as 30-600, for example 50-500, such as 100-400 or 200-300; and/or wherein the number of wheels independently is selected from the ranges 2-15, such as 3-14, e.g. 4-13, such as 5-12, for example 6-11, such as 7-10 or 8-9; and/or wherein the number of base plate, if being present, independently is selected from the ranges 2-15, such as 3-14, e.g. 4-13, such as 5-12, for example 6-11, such as 7-10 or 8-9.
In an embodiment of the toy building block system according to the first aspect of the present invention the additionally comprises one or more additional building elements, wherein said one or more additional building elements comprises one or more holes, such as one or more through-going holes, wherein said one or more holes is/are having dimensions and a geometry which are adapted to the dimensions of one or more protrusion of said building block; so as to be able to accommodate said protrusion and thereby hold said building block in place in said additional building elements solely by friction.
The Second Aspect of the Present Invention
In a second aspect the present invention relates to the use of a toy building block system according to the first aspect for activation of children.
Referring to the figure in order to better illustrating the present invention, FIG. 1a is a perspective view illustrating the prior art toy building block marketed as Plus-Plus®.
FIG. 1a shows the prior art toy building block Plus-Plus® 200 which comprises

    
    
        a first elongate portion 2 extending in a longitudinal direction X;
        
            a second elongate portion 4 extending in said longitudinal direction X;
            an intermediate portion 6 connecting said first elongate portion 2 with said second elongate portion 4 at a middle position 8 thereof;
            a first end portion 10 extending in a transverse direction Y, perpendicular to said longitudinal direction X, from said first elongate portion 2, at a side thereof opposite to said intermediate portion 6, and at a middle position thereof;
            a second end portion 12 extending in said transverse direction Y, perpendicular to said longitudinal direction X, from said second elongate portion 4, at a side opposite to said intermediate portion 6, and at a middle position thereof;
            said building block thereby comprises six protrusions 14 and two voids 16, wherein each void 16 is being defined between an end of said first elongate portion 2 and an end of said second elongate portion 4.
        
        
    
    


It is seen in FIG. 1a that all the elements 2,4, 6 and 14 of the toy building block 200 are having the same extension (unit size=1) in a height direction Z, which is perpendicular to the longitudinal direction X and to the transverse direction Y.
It is also seen in FIG. 1a that all the elements 2 and 4 are having an extension in the longitudinal direction X of unit size=3, and an extension in the transversal direction Y of unit size=1.
Further, it is seen in FIG. 1a that all the elements 6 and 14 are having an extension in the longitudinal direction X of unit size=1, and an extension in the transversal direction Y of unit size=1.
Hereby, the toy building block 200 illustrated in FIG. 1a geometrically may be considered as being made up of nice cubes of equal unit size 1 fused together as a single coherent entity. This is illustrated in FIG. 1b, in which the dashed lines mark the separation of the imaginary separation lines between individual cubes.
Accordingly, FIGS. 1a and 1b shows that the toy building block 200 comprises six protrusions 14 and two voids 16, wherein each void 16 is being defined between an end of said first elongate portion 2 and an end of said second elongate portion 4.
The presence of such protrusions 14 and voids 16 allows for assembling two or more toy building blocks 200 of similar size and geometry in such a way that one protrusion of one building block 200 is accommodated in a void 16 of another building block 200.
This is illustrated in FIG. 2.
FIG. 2 FIG. 2 is a perspective view illustrating a creation in the form of a figurine made up of a plurality of the building blocks illustrated in FIGS. 1a and 1b. 
The figurine illustrated in FIG. 2 resembles a person and a bench.
FIG. 3 is a perspective view illustrating a toy building block system according to the present invention comprising the prior art toy building block of FIG. 1a in combination with a wheel.
FIG. 3 accordingly shows that the toy building block system 100 comprising the prior art toy building block 200 in combination with a wheel 300.
The building block 200 of the toy building system 100 is as described in respect of the prior art toy building block Plus-Plus® above.
The wheel 300 of the system comprises a hub 18 and a wheel rim 20.
The wheel rim 20 is surrounding the hub 18, and the wheel rim 20 is being attached to the hub 18 in such a way that the wheel rim is configured to be able to swivel around a rotational axis A in relation to the hub 18.
Moreover, the hub 18 at a centre 22 thereof comprises a hole 24 extending in an axial direction A. The dimensions and geometry of the hole 24 are adapted to the dimensions and geometry of one of the protrusions 14 of the building block 200. In this way the hole 24 is able to accommodate the protrusion 14 and thereby hold that protrusion 14 and thereby also the building block 200 in place in said hole 24 of said hub 18 solely by friction.
Accordingly, the toy building block system 100 of the present invention allows for much greater variations in construction of structures made up of the Plus-Plus® building blocks.
FIGS. 4a and 4b are perspective views illustrating a wheel of the toy building block system according to the present invention.
Again, it is seen that the wheel comprises a hub 18 and a wheel rim 20.
FIGS. 4a and 4b shows that the wheel rim 20 along an end surface 25 thereof comprises eight holes 26 extending in an axial direction A.
The dimensions and geometry of the holes 26 of the wheel rim 20 of the wheel 300 illustrated in FIG. 4a are adapted to the dimensions and geometry of the one or more protrusions 14 of the building block, and also to the dimensions and geometry of the hole 24 in the hub.
In this way it is possible to accommodate and hold a protrusion 14 of a building block 200 and thereby to hold that building block 200 in place in the wheel rim 20 solely by friction.
An alternative embodiment is shown in FIG. 4b. In this embodiment the wheel rim 20 along an end surface 25 thereof also comprises eight holes 26 extending in an axial direction A. However, in this embodiment, the dimensions of these holes 26 of the wheel rim 20 are smaller than the dimensions of the hole 24 in said hub 18 and also smaller than the dimensions of the protrusions 14 of the building block 200.
In this way, the toy building block system 100 may comprise two sizes of building blocks 200, wherein one size of building blocks 200 are adapted, in respect of geometry and dimensions, to be connected to a hub 18 of a wheel 300 via the hole 24 therein, whereas another type of one size of building blocks 200 are adapted, in respect of geometry and dimensions, to be connected to the wheel rim 20 of a wheel 300, in its associated hole 26.
It is seen in FIGS. 4a and 4b that the eight holes 26 in the wheel rim 20 are arranged in four groups 28 of holes 26, wherein each group 28 comprises two holes 26. The four groups 28 are arranged along the end surface 25 of the wheel rim at an equiangular spacing of 90°.
FIGS. 5a and 5b are plan views illustrating a wheels of FIGS. 4a and 4b, respectively.
The distance between two adjacent holes 26 in each group 28 of holes corresponds to the distance, in a transverse direction Y, between the first elongate portion 2 and the second elongate portion 4 of the building block 200.
FIGS. 6a and 6b are cross-sectional views illustrating a wheel rim of a wheel of the toy building block system according to the present invention.
FIG. 6a illustrates the wheel rim 20 of the wheel 300 of the toy building block system 100 of the present invention.
FIG. 6a shows the wheel rim 20 which at a surface 30 facing the axial axis A thereof comprises a single circular recess 32 extending into the wheel rim 20.
FIG. 6b shows an alternative embodiment wherein the wheel rim 20 which at a surface 30 facing the axial axis A thereof comprises two circular recesses 32 extending into the wheel rim 20.
Hereby the hub, when being provided with protrusions which are adapted to enter into engagement with the recess/recesses 32 of the wheel rim 20 can be attached together in a swivelling fashion.
Such a hub is illustrated in FIG. 7.
FIG. 7 is a plan view illustrating a hub of a wheel of the toy building block system according to the present invention.
FIG. 7 shows the hub 18 which at a surface 34 facing away from the axial axis A comprises a protrusion 36 extending away from the axial axis A in a radial direction
Accordingly, the dimensions and geometry of the wheel rim 20 with its recess/recesses are adapted to the dimensions and geometry of the hub 18 with its protrusion/protrusions in such a way that the wheel rim 20 is being able to swivel around the hub when the wheel rim 20 is attached to the hub 18.
Designing the wheel rim 20 and the hub 18 in a way illustrated in FIGS. 6a, 6b and 7 allows the hub 18 and the wheel rim 20 to be simple clicked together in order to achieve the swivelling fashion of attachment.
In an alternative embodiment to the embodiment illustrated in FIGS. 6a, 6b and 7, the hub 18 at a surface 30 facing away from the axial axis A thereof may comprise one or more circular recesses extending into the hub 18; and the wheel rim 20 at a surface 34 facing said axial axis may comprise a corresponding number of protrusions 36 extending towards the axial axis A in such a way that the dimensions and geometry of the wheel rim 20 with its protrusion(s) are adapted to the dimensions and geometry of the hub 18 with its recess(es) in such a way that the wheel rim is being able to swivel around the hub when the wheel rim 20 is attached to the hub 18 (not illustrated in the figures).
FIG. 8 is a perspective view illustrating a creation made up of a plurality of the building blocks and four wheels according to the present invention.
Accordingly, FIG. 8 illustrates a toy vehicle 500 according to the toy building block system 100 of the present invention having a body which is made up of a plurality of building blocks 200. The vehicle also comprises four wheels 300.
Each wheel 300 is being attached to the body of the vehicle in that an end portion 10,12 of a building block 200 is arranged in the hole 24 of the hub 18 of that wheel. The remainder of that building block is attached to the body of the vehicle.
FIG. 9 illustrates a further embodiment of the toy building block system of the first aspect of the present invention.
FIG. 9 shows a toy building block system 100 comprising a building block 200, a wheel 300 and further comprises a base plate 400.
The details of the building block 200 and the wheel 300 are as described above.
The base plate comprises an array of holes 38 extending into the plate 400. The array of holes 38 are arranged at a surface of the plate and extends in two perpendicular directions;
Each of the holes 38 are having dimensions and geometries which are adapted to the dimensions and geometry of one of the protrusions 14 of said building block 200.
Moreover, the distance between any two nearest and adjacent holes 38 in the base plate corresponds to the distance, in a transverse direction, between the first elongate portion 2 and the second elongate portion 4 of the building block 200.
In this way, it is possible to accommodate the protrusions 14 and thereby hold the building block 200 in place in the base plate 400 solely via friction.
FIG. 9 shows that the base plate 400 comprises an array of holes 38 consisting of 6×14 holes, equal to 84 holes thereby being arranged in the base plate along a longitudinal direction and a transverse direction so as to form a regular pattern of holes.
In alternative embodiments the base plate 400 may comprise 2-75 holes or more, such as 5-70, for example 10-65, such as 15-60, for example 20-55, e.g. 25-50, such as 30-45 or 40-45 holes along one or more lines extending in a longitudinal direction and/or in a transversal direction.
The base plate 400 may have any geometrical shape, such as having an outer perimeter forming a rectangle, such as a square or forming a triangle, a pentagon, a hexagon, a heptagon, an octagon, or forming a circle or forming an oval shape.
FIG. 10 is a plan view illustrating the base plate of FIG. 9.
Incorporating a base plate 400 into the toy building block system 100 of the present invention enhances the number of combinations of putting together various elements of the toy building system 100 of the invention.
An example is illustrated in FIG. 11.
FIG. 11 is a perspective view illustrating a creation in the form of a toy vehicle made up of a plurality of the building blocks and four wheels and a base plate according to the present invention.
Accordingly, FIG. 11 illustrates a toy vehicle 500 according to the toy building block system 100 of the present invention having a chassis which is made up of a base plate 400. The vehicle also comprises four wheels 300 which are being attached via their respective hub hole 24 to a building block 200 which in turn is being attached to the base plate 400.
FIG. 12a is a cross-sectional view of another embodiment of the wheel of the toy building block system according to the present invention.
FIG. 12a shows the wheel 300 comprising a wheel rim 20 and a wheel hub 18 comprising a first hub part 18a and a second hub part 18b. 
The first hub part 18a comprises a pair of a first engagement means 42 extending in an axial direction from a side 40 thereof. The second hub part 18b comprises a pair of a second engagement means 44 extending from a side 40 thereof.
The wheel rim 20 comprises a central through-going hole 46 having a first diameter D1 at the central part of the through-going hole 46, a second diameter D2 at each side 48 of said wheel rim 20. It is seen that the first diameter D1 is smaller than the second diameter D2.
The diameter of the first hub part 18a the second hub part 18b corresponds to the diameter D2.
Moreover, the first engagement means 42 of the first hub part 18a is being configured to enter into engagement with the second engagement means 44 of said second hub part 18b, thereby allowing to sandwich the wheel rim 20 between the first hub part 18a and the second hub part 18b and releasable lock the first hub part 18a and the second hub part 18b together.
FIG. 12b illustrates the wheel 300 illustrated in FIG. 12a in an assembled state.
It is seen in FIG. 12a that the engagement means 42 of said first hub part 18a comprises an end element 50a which protrudes in a direction perpendicular to an axial direction of the first hub part 18a and away from the central axis A of the first hub part 18a. 
It is also seen in FIG. 12a that the engagement means 44 of the second hub part 18b comprises an end element 50b which protrudes in a direction perpendicular to an axial direction of the first hub part 18b and towards the central axis A of the second hub part 18b. 
FIG. 12a also shows that the radial position of the first engagement means 42 on the side 40 of the first hub part 18a is different from the radial position of the corresponding second engagement means 44 on the side 40 of the second hub part 18b with which the first engagement means 18a is/are to enter into engagement with.
Such configuration of the engagement means 42,44 ensures a reliable engagement of the first hub part 18a with the second hub part 18b. 
The number of first engagement means 42 of said first hub part 18a and the number of the second engagement means 44 of the second hub part 18b may independently be 1, 2, 3, 4, 5, 6 or more.
However, a number of four engagement means in each hub part 18a,18b has proven to be advantageous.
Such an embodiment is further illustrated in FIG. 13.
FIG. 13 is a perspective view showing a first hub part 18a comprising four engagement means 42. The four engagement means 42 are equiangular spaced by an angle of 90°.
Each engagement means 42 comprises an end element 50a. FIG. 13 shows that two end elements 50a of the engagement means 42 protrudes towards the central axis A of said first hub part 18a and these two engagement means are oppositely arranged on the side 40 of the first hub part 18a. Likewise, the other end elements 50a of the two remainder engagement means 42 protrude away from the central axis A of said first hub part 18a and these two engagement means are oppositely arranged on the side 40 of the first hub part 18a. 
Providing both the first hub part 18a and the second hub part 18b with such a design allows for an identical design of these two hub parts 18a,18b and still enables making the two hub parts enter into engagement with each other simply by clicking them together while sandwiching the wheel rim 20 therebetween.
FIG. 14 is a plane view of the outer side of the hub part 18a,18b as illustrated in FIG. 13.
FIG. 14 shows that the first of second hub part 18a,18b is having a diameter D2 corresponding to the larger diameter D2 of the through-going hole 46 of the wheel rim 20 illustrated in FIG. 12a. 
FIG. 15 is a perspective view showing the wheel rim of the wheel 300.
FIG. 15 shows that the wheel 20 comprises a through-going hole 46 having a first diameter D1 at the central part of the through-going hole 46, and a second diameter D2 at the side 48 of said wheel rim 20. It is seen that the first diameter D1 is smaller than the second diameter D2.
The part of the hole 46 corresponding to the larger diameter provides for accommodation of the first or second hub part 18a,18b upon assembly of the wheel 300 from the first hub part 18a, the second hub part 18b and the wheel rim 20.
It should be understood that all features and achievements discussed above and in the appended claims in relation to one aspect of the present invention and embodiments thereof apply equally well to the other aspects of the present invention and embodiments thereof.
LIST OF REFERENCE NUMERALS


    2 First elongate portion of building block
    4 Second elongate portion of building block
    6 Intermediate portion connecting first and second elongate portion
    8 Middle portion of first and second elongate portion
    10 First end portion
    12 Second end portion
    14 Protrusion
    16 Void between protrusions of first and second elongate portion
    18 Hub
    18a First hub part
    18b Second hub part
    20 Wheel rim
    22 Centre of hub
    24 Centre hole in hub
    25 End surface of wheel rim
    26 Hole in wheel rim
    28 Group of holes in wheel rim
    30 Surface of wheel rim facing the axial axis of wheel
    32 Circular recess of wheel rim
    34 Surface of hub facing away from axial axis of wheel
    36 Protrusion of hub, extending away from axial axis of wheel
    38 Hole in base plate
    40 Side of hub part
    42 First engagement means
    44 Second engagement means
    46 Central though-going hole of wheel rim
    48 Side of wheel rim
    50a,50b End element of engagement means
    100 Toy building block system
    200 Toy building block
    300 Wheel
    400 Base plate
    500 Creation
    A Rotational axis of wheel
    D1 Diameter of central part of through-going hole in wheel rim
    D2 Diameter of outer part of through-going hole in wheel rim
    X Longitudinal direction
    Y Transverse direction
    Z Height direction

## Claims

1. A toy building block system comprising:
one or more building blocks; and
one or more wheels;

wherein each of the one or more building blocks has six protrusions and two voids formed by:
a first elongate portion extending in a longitudinal direction;
a second elongate portion extending in said longitudinal direction;
an intermediate portion connecting said first elongate portion with said second elongate portion at a middle position thereof;
a first end portion extending in a transverse direction, perpendicular to said longitudinal direction, from said first elongate portion, at a side thereof opposite to said intermediate portion, and at a middle position thereof; and
a second end portion extending in said transverse direction, perpendicular to said longitudinal direction, from said second elongate portion, at a side opposite to said intermediate portion, and at a middle position thereof;
wherein each void is defined between an end of said first elongate portion and an end of said second elongate portion; and

wherein each of the one or more wheels comprises:
a hub; and
a wheel rim surrounding said hub, the wheel rim being attached to said hub in such a way that said wheel rim is configured to swivel around a rotational axis in relation to said hub;
wherein a center of said hub comprises a hole extending in an axial direction, dimensions and geometry of said hole being adapted to dimensions and geometry of at least one of the six protrusions of the one or more building blocks; such that the hole is configured to receive the at least one of the six protrusions and thereby hold the at least one of the six protrusions of the one or more building blocks in place in said hole of said hub solely by friction,
wherein said hub comprises a first hub part and a second hub part, said first hub part comprising one or more first connectors extending in the axial direction from a side of the first hub part and the second hub part comprises one or more second connectors extending from a side of the second hub part, the wheel rim comprising a central through hole with a first diameter at a center of the through hole and a second diameter at a side of the wheel rim, the first diameter of the through hole being smaller than the second diameter of the through hole and the second diameter of the through hole being approximately the same as a respective diameter of each of the first hub part and the second hub part, and
wherein the one or more first connectors is configured to engage with the one or more second connectors to sandwich the wheel rim between the first hub part and the second hub part and to releasably lock the first hub part to the second hub part.

2. The toy building block system according to claim 1, wherein said first elongate portion, said second elongate portion, said intermediate portion, said first end portion and said second end portion form an integrated, coherent structure.

3. The toy building block system according to claim 1, wherein the one or more building blocks has an outer shape corresponding to nine cubes fused together to form a coherent structure.

4. The toy building block system according to claim 1, wherein an end surface of said wheel rim comprises one or more holes extending in the axial direction; and wherein dimensions and geometry of said one or more holes of said wheel rim are adapted to the dimensions and the geometry of the at least one of the six protrusions of the one or more building blocks; such that the one or more holes of the wheel rim are configured to receive and hold the at least one of the six protrusions and thereby the one or more building blocks in place in said wheel rim solely by friction.

5. The toy building block system according to claim 1, wherein an end surface of said wheel rim comprises one or more holes extending in the axial direction; and wherein dimensions of said one or more holes of said wheel rim are smaller than the dimensions of the hole in said hub.

6. The toy building block system according to claim 5, wherein the one or more holes of said wheel rim are arranged in 1, 2, 3, 4 or five groups of 1, 2 or 3 holes.

7. The toy building block system according to claim 6, wherein the one or more holes of said wheel rim are arranged in four groups of two adjacent holes, the four groups being arranged along a surface of said wheel rim at an equiangular spacing of 90°, wherein a distance between the two adjacent holes in each of the four groups of holes corresponds to a distance, in a transverse direction, between the first elongate portion and the second elongate portion of the one or more building blocks.

8. The toy building block system according to claim 1, wherein a number of the one or more first connectors of said first hub part and/or a number of the one or more second connectors of said second hub part is respectively 1, 2, 3, 4, 5, 6 or more.

9. The toy building block system according to claim 1, wherein the one or more first connectors of said first hub part comprise an end element protruding in a direction perpendicular to an axial direction of said first hub part; and wherein the one or more second connectors of said second hub part comprise an end element protruding in a direction perpendicular to an axial direction of said second hub part.

10. The toy building block system according to claim 9, wherein the respective end elements of the one or more first connectors and the one or more second connectors protrude in a direction perpendicular to the respective axial direction of said first or second hub part and away from or towards a central axis of said first or second hub part.

11. The toy building block system according to claim 10, wherein said first hub part comprises two first connectors, each first connector comprising an end element protruding in a direction perpendicular to the axial direction of said first hub part and away from the central axis of said first hub part or an end element protruding in a direction perpendicular to the axial direction of said first hub part and towards the central axis of said first hub part; and wherein said second hub part comprises two second connectors, each second connector comprising an end element protruding in a direction perpendicular to the axial direction of said second hub part and away from the central axis of said second hub part or an end element protruding in a direction perpendicular to the axial direction of said second hub part and towards the central axis of said second hub part.

12. The toy building block system according to claim 11, wherein the first hub part includes two identically oriented first connectors arranged opposite to each other on said first hub part; and wherein the second hub part includes two identically oriented second connectors arranged opposite to each other on said second hub part.

13. The toy building block system according to claim 11, wherein the two first connectors of the first hub part and the two second connectors of the second hub part are equiangular spaced by an angle of 90°.

14. The toy building block system according to claim 1, wherein a radial position of the one or more first connectors on the side of said first hub part is different from a radial position of the one or more second connectors on the side of said second hub part with which the one or more first connectors is configured to engage with.

15. The toy building block system according to claim 1, wherein the first hub part and the second hub part of the one or more wheels are geometrically and dimensionally similar or identical.

16. The toy building block system according to claim 1, further comprising a base plate, wherein said base plate comprises an array of holes extending into said base plate, said array of holes being arranged at a surface of said base plate in two perpendicular directions;
wherein one or more of said holes have dimensions and geometries which are adapted to the dimensions and the geometry of at least one of the six protrusions of the one or more building blocks;
wherein a distance between any two adjacent holes in said base plate corresponds to a distance, in a transverse direction, between the first elongate portion and the second elongate portion of the one or more building blocks, such that the distance between the any two adjacent holes is configured to accommodate the at least one of the six protrusions and thereby hold the one or more building blocks in place in said base plate solely via friction.

17. The toy building block system according to claim 16, wherein said base plate has an extension in the longitudinal direction and an extension in the transverse direction, said longitudinal direction being perpendicular to the transverse direction, wherein said array of holes is arranged in said base plate along said longitudinal direction and said transverse direction so as to form a regular pattern of holes.

18. The toy building block system according to claim 16, wherein said base plate has an outer perimeter forming a rectangle, a triangle, a pentagon, a hexagon, a heptagon, an octagon, or forming a circle or an oval shape.

19. The toy building block system according to claim 1, wherein said toy building block system additionally comprises one or more additional building elements, wherein said one or more additional building elements comprises one or more holes, and wherein said one or more holes have dimensions and a geometry which are adapted to the dimensions of the at least one of the six protrusions of the one or more building blocks, so as to be able to accommodate the at least one of the six protrusions and thereby hold the one or more building blocks in place in said additional building elements solely by friction.

20. A method of using the toy building block system according to claim 1, the method comprising:
enabling a child to connect the one or more building blocks to the one or more wheels.