CA1046767A - Interlocking toy building element - Google Patents
Interlocking toy building elementInfo
- Publication number
- CA1046767A CA1046767A CA240,023A CA240023A CA1046767A CA 1046767 A CA1046767 A CA 1046767A CA 240023 A CA240023 A CA 240023A CA 1046767 A CA1046767 A CA 1046767A
- Authority
- CA
- Canada
- Prior art keywords
- face
- cylindrical projection
- element according
- block
- gripping members
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910052729 chemical element Inorganic materials 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002860 competitive effect Effects 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H33/00—Other toys
- A63H33/04—Building blocks, strips, or similar building parts
- A63H33/06—Building blocks, strips, or similar building parts to be assembled without the use of additional elements
- A63H33/08—Building blocks, strips, or similar building parts to be assembled without the use of additional elements provided with complementary holes, grooves, or protuberances, e.g. dovetails
- A63H33/086—Building blocks, strips, or similar building parts to be assembled without the use of additional elements provided with complementary holes, grooves, or protuberances, e.g. dovetails with primary projections fitting by friction in complementary spaces between secondary projections, e.g. sidewalls
Landscapes
- Toys (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A building element or toy building element is disclosed.
The hollow building element is of rectangular parallelopiped con-figuration and has side and end walls and one open face and one closed face having interior and exterior surfaces and at least one cylindrical projection on the closed face exterior surface.
At least one gripping member is provided within the hollow ele-ment and extends from the closed face interior surface substan-tially to the plane of the edges of the side and end walls at the open face, the gripping member having a circular arcuate surface with a radius equal to the radius of the cylindrical projection.
The central axis of the circular arcuate surface is coaxial with the axis of the cylindrical projection, whereby when two compatible blocks are positioned together a cylindrical projection on one block is received and resiliently held between the circular arcu-ate surface and adjacent side walls. This interlocking arrange-ment maintains the block in snug interfitting relationship which can easily be separated as desired.
A building element or toy building element is disclosed.
The hollow building element is of rectangular parallelopiped con-figuration and has side and end walls and one open face and one closed face having interior and exterior surfaces and at least one cylindrical projection on the closed face exterior surface.
At least one gripping member is provided within the hollow ele-ment and extends from the closed face interior surface substan-tially to the plane of the edges of the side and end walls at the open face, the gripping member having a circular arcuate surface with a radius equal to the radius of the cylindrical projection.
The central axis of the circular arcuate surface is coaxial with the axis of the cylindrical projection, whereby when two compatible blocks are positioned together a cylindrical projection on one block is received and resiliently held between the circular arcu-ate surface and adjacent side walls. This interlocking arrange-ment maintains the block in snug interfitting relationship which can easily be separated as desired.
Description
1046~767 The present invention relates to an interlocking build-ing element, and particularly to a hollow building element or block of small scale of the type used in erection sets enabling the user to construct any number of various structures and designs utilizing a number of similar or compatible interlocking building units or elements.
For simplicity, the element or block according to the present invention will hereafter be referred to as a building ele-ment or toy building element.
Building elements of the same general nature have ob-tained broad acceptance and are usuall,v molded from plastics mat-erial which interlock and interfit one with the other to provide any number of building possibilities. It is usual that erection kits or sets consist of a number of standard-size building ele-ments and also a number of specialized blocks which may be in the form of prisms or have inclined surfaces to enable inclined roof-ing structures to be made.
To date, the standard building elements of toy erection sets have been pretty well standard in overall exterior configura-tion having one closed side and one open side, with the closed side being provided with a number (usually an equal number in pairs) of primariy projections in the form of cylindrical pro-jections which are adapted to interlockingly engage with various-ly designed secondary projections in the form of gripping means provided within the interior of the element, and with which the primary projections interfit and interlock when the closed side of one block is positioned in contact with the open side of another identical or compatible block.
While the paired primary cylindrical projections of these known building elements have been unchanged for many years, much reasearch has been done in the design and configuration of the secondary means provided within the block and extending to-wards the open face thereof to attempt to achieve an increasing-ly satisfactory building element. ~
- 1- 4~ ~
~ 46~67 To be acceptable in the competitive world of the toy building blocks, the elements must:
1. Be durable;
For simplicity, the element or block according to the present invention will hereafter be referred to as a building ele-ment or toy building element.
Building elements of the same general nature have ob-tained broad acceptance and are usuall,v molded from plastics mat-erial which interlock and interfit one with the other to provide any number of building possibilities. It is usual that erection kits or sets consist of a number of standard-size building ele-ments and also a number of specialized blocks which may be in the form of prisms or have inclined surfaces to enable inclined roof-ing structures to be made.
To date, the standard building elements of toy erection sets have been pretty well standard in overall exterior configura-tion having one closed side and one open side, with the closed side being provided with a number (usually an equal number in pairs) of primariy projections in the form of cylindrical pro-jections which are adapted to interlockingly engage with various-ly designed secondary projections in the form of gripping means provided within the interior of the element, and with which the primary projections interfit and interlock when the closed side of one block is positioned in contact with the open side of another identical or compatible block.
While the paired primary cylindrical projections of these known building elements have been unchanged for many years, much reasearch has been done in the design and configuration of the secondary means provided within the block and extending to-wards the open face thereof to attempt to achieve an increasing-ly satisfactory building element. ~
- 1- 4~ ~
~ 46~67 To be acceptable in the competitive world of the toy building blocks, the elements must:
1. Be durable;
2. se economical in production; and
3. Provide a snug fitting interlock so that when adjacent blocks are interlocked they are held against inadvertent opening and yet when the blocks are desired to be separated, this can be accomplished using only a reasonable amount of force for in many instances such ~70c7cs are used and enjoyed by c~2ildren who do not possess the finger strength necessary to separate blocks which are tightl~ fitted together; and
4. se designed and manufacture~ in such a way whereby the blocks may be used many thousands of times without failure occurring.
To attain this goal, considerable research and develop-ment has been conducted in various countries throughout the world to provide a model toy building element which will meet all the stringent requirements of such use and yet be capable of being manufactured and distributed in as economical a manner as possible so that such an erection set (which in addition to being enjoyable is also educational) can be purchased and used by children of all families. The matter of economics in production and sale is also a very important criterion when considering toy building blocks for the loss factor of toy building blocks is high, and it is important that any lost or misplaced blocks can be replaced at acceptable cost.
The purpose of the present invention is to provide a building element or a toy building element which satisfies the above criteria of economy of manufacture and replacement and dura-bility and also the various requirements noted above which mustbe inherently possessed by such building blocks to render them attractive and marketable.
Specifically, the object of the invention is to provide ~0~1~767 a hollow building element of rectangular parallelopi~ed configura-tion having side and end walls, and one open face, and one closed face having interior and exterior surfaces, and at leas-t one cylin-drical projection on the closed face exterior surface. At least one gripping member is provided within the hollow element extending from the closed face interior surface substantially to the plane of the edges of the side and end walls at the open face. The gripping member has a circular arcuate surface with a radius equal to the radius of the cylindrical projection, the central axis of the circular arcuate surface being coaxial with the axis of the cylindrical projection, whereby when two compatible blocks are positioned together a cylindrical proiection on one block is received and resiliently held between the circular arcuate surface and an adjacent side wall.
These and other objects of the present invention will become apparent from the following description in conjunction with the accompanying drawings wherein:
Figure 1 illustrates in perspective view the known top configuration of a toy building block provided with a number of cylindrical projections provided thereon;
Figure 2 shows in bottom perspective view one embodiment of the secondary projection which provides the gripping members of the present invention;
Figure 3 is a bottom view of the embodiment illustrated in Figure 2;
Figure 4 is a bottom perspective view of a further embodi-ment of the secondary projections according to the present inven-tion;
Figure 5 is a bottom view of the secondary projections shown in Figure 4;
Figure 6 is a sectional view taken along line 6-6 of Figure 5;
Figure 7 i5 a still further embodiment of the secondary ~L046~67 projections according to the present invention;
Figure 8 is a bottom view of the embodiment shown in Figure 7;
Figure 9 is a sectional view taken along line 9-9 of Figure 8;
Figures 10, 11 and 12 all show in perspective view varia-tions in size of building elements which can advantageously employ the gripping member embodiments of the present invention;
Figure 13 shows a semi-block in perspective view;
Figure 14 shows in perspective view a thin building element, which may advantageously employ any of the present gripp-ing embodiments; and Figure 15 shows in perspective view a building element having an inclined surface and which may advantageously employ any of the present gripping embodiments.
Reference will now be had to the accompanying drawings wherein like reference numerals denote like parts.
The hollow building element shown generally by numeral 2 in Figure 1, consists of a block of rectangular parallelopiped configuration which has end walls 4 and side walls 6. One major face of the element is closed as shown at 8, while the other major face is open as shown generally at 10 in Figures 2 and 3 to provide a hollow structure completely open along one major face.
The exterior surface of the closed face 8 is provided with one or a number of cylindrical projections 12, and in the known building element shown in Figure 1, the projections 12 are provided in pairs lengthwise of the block.
The interior surface 14 (Figure 3) of the closed face 8 is provided with upstanding secondary projections in the form of gripping members 16 specifically adapted to resiliently engage and retain the cylindrical projections 12 of an identical or com-patible adjacent block when two such blocks are positioned in inter-fitting and interlocking relationship.
104~i'7ti7 One embodiment of gripping members very well suited to the satisfaction of the objects of the present invention is shown in Figures 2 and 3. Each of the gripping members 16 project from the interior surface 14 of the closed face 8 in which can be con-sidered parallel relationship with the planes of the end 4 and side walls 6, and the circular arcuate surfaces 18 coincide with a portion of an imaginary extension of the cylindrical projections 12 through the closed face and into the hollow cavity of the block. Figure 3 particularly well shows the positioning of the gripping elements 16 with respect to the cylindrical projections 12 carried on the other side of the closed surface 8 and which are shown in broken lines. Specifically, the circular arcuate sur-faces 18 of the engaging elements 16 define a portion of the cir-cumference of imagined extensions of the cylindrical projections and it will be appreciated from Figure 3 that when the closed face 8 of one block carrying projections 12 is mated to the open face 10 of a block as shown in Figure 3, that the projections 12 will be snugly and resiliently received between the gripping members 16 and the interior surface of adjacent side walls 6 of the block.
Stated in other terminology, a circular arcuate sur-face 18 has a radius equal to the radius of the cylindrical pro-jection 12 with the central axis of a circular arcuate surface being coaxial with the axis of a cylindrical projection.
It will be seen that the gripping members 16 are also provided in pairs longitudinally of the block, and the pairs of gripping members 16 may be strengthened if desired by the provision of bridgingmembers 20. ~hile Figures 2 and 3 show the presence of bridging members 20, the members 20 can be omitted as preferred.
While the circular arcuate surfaces 18 of the middle pairs of gripping members 16 may define a circular segment of 180 , it is preferred that the sutended arcuate surfaces be substantially 150 as represented by angle ~ in Figure 3. It has been found that a subtended arc of substantially 150 provides excellent resilient gripping of the cylindrical projections 12 so that the 1~)46767 blocks are firmly held together and will not inadvertently separate and yet may be relatively easily separated when such is desired.
The end pairs of the gripping elements may have a shorter arc than the middle pairs whereby when cylindrical pro-jections 12 are inserted in contact therewith the cylindrical pro-~ections are resiliently held between the shortened arcuate sur-face and adjacent side walls of the block.
A further embodiment of gripping members is shown in Figures 4 and 5 and where each gripping member 16 is individually separate without the provision of any bridging member, and the arcuate surfaces 18 of the end pairs merge smoothly with the end walls 4 of the block as clearly shown in Figure S.
In order that the gripping members 16 may more snugly and resiliently engage the cylindrical projections 12, it is sug-gested that the outwardly facing edges 22 of the gripping members inclined outwardly in a manner as shown in Figure 6. In this Fig-ure, the amount of lateral inclination of the side edges 22 of the gripping elements is shown by angle~ and an angle of 10 has been shown to provide an excellently resilient and yet durable gripping member configuration.
A further embodiment of the inventive concept is illus-trated in Figures 7, 8, and 9, and from Figure 9, it will be ap-preciated that the side edges 24 of the gripping elements angle uniformly inwardly in the direction towards the open face of the block for the purpose of providing a durable and long lasting unit. An angle of ~ of about 25 has been found most satisfactory.
The block according to Figures 4 through 9 may be pro-vided with bridging members such as shown in Figure 3 if desired, although it is considered that such strengthening means are not necessary with either of these embodiments.
Half blocks, or quarter blocks, or eighth blocks, such as shown in Figures 10, 11, 12, and 13, respectively, are also 1~46767 particularly well suited for the application or any of the em-bodiments of the gripping members of the present invention, as shown in Figures 2 through 9, inclusive.
Figure 4 shows a thinner building element, the depth of which is preferably a fraction 1/4, 1/3, 1/2, etc., of the height of the standard element whereby, if desired, like units can be combined together to provide a standard building unit or of course for other suitable erection applications. The gripping members carried by block such as shown in Figure 14, may be simi-lar to any of the engaging elements such as discussed above withrespect to Figures 2 through 9, inclusive.
Blocks other than square or rectangular may also include the novel engaging aspects of the present invention, and Figure 15 shows by way of example only a building element having an in-clined surface 26 which may be used for example in the construct-ing of the roof segments of a building structure. Any of the embodiments of Figures 2 through ~ can with modification be used with the block configuration shown in Figure 15.
To attain this goal, considerable research and develop-ment has been conducted in various countries throughout the world to provide a model toy building element which will meet all the stringent requirements of such use and yet be capable of being manufactured and distributed in as economical a manner as possible so that such an erection set (which in addition to being enjoyable is also educational) can be purchased and used by children of all families. The matter of economics in production and sale is also a very important criterion when considering toy building blocks for the loss factor of toy building blocks is high, and it is important that any lost or misplaced blocks can be replaced at acceptable cost.
The purpose of the present invention is to provide a building element or a toy building element which satisfies the above criteria of economy of manufacture and replacement and dura-bility and also the various requirements noted above which mustbe inherently possessed by such building blocks to render them attractive and marketable.
Specifically, the object of the invention is to provide ~0~1~767 a hollow building element of rectangular parallelopi~ed configura-tion having side and end walls, and one open face, and one closed face having interior and exterior surfaces, and at leas-t one cylin-drical projection on the closed face exterior surface. At least one gripping member is provided within the hollow element extending from the closed face interior surface substantially to the plane of the edges of the side and end walls at the open face. The gripping member has a circular arcuate surface with a radius equal to the radius of the cylindrical projection, the central axis of the circular arcuate surface being coaxial with the axis of the cylindrical projection, whereby when two compatible blocks are positioned together a cylindrical proiection on one block is received and resiliently held between the circular arcuate surface and an adjacent side wall.
These and other objects of the present invention will become apparent from the following description in conjunction with the accompanying drawings wherein:
Figure 1 illustrates in perspective view the known top configuration of a toy building block provided with a number of cylindrical projections provided thereon;
Figure 2 shows in bottom perspective view one embodiment of the secondary projection which provides the gripping members of the present invention;
Figure 3 is a bottom view of the embodiment illustrated in Figure 2;
Figure 4 is a bottom perspective view of a further embodi-ment of the secondary projections according to the present inven-tion;
Figure 5 is a bottom view of the secondary projections shown in Figure 4;
Figure 6 is a sectional view taken along line 6-6 of Figure 5;
Figure 7 i5 a still further embodiment of the secondary ~L046~67 projections according to the present invention;
Figure 8 is a bottom view of the embodiment shown in Figure 7;
Figure 9 is a sectional view taken along line 9-9 of Figure 8;
Figures 10, 11 and 12 all show in perspective view varia-tions in size of building elements which can advantageously employ the gripping member embodiments of the present invention;
Figure 13 shows a semi-block in perspective view;
Figure 14 shows in perspective view a thin building element, which may advantageously employ any of the present gripp-ing embodiments; and Figure 15 shows in perspective view a building element having an inclined surface and which may advantageously employ any of the present gripping embodiments.
Reference will now be had to the accompanying drawings wherein like reference numerals denote like parts.
The hollow building element shown generally by numeral 2 in Figure 1, consists of a block of rectangular parallelopiped configuration which has end walls 4 and side walls 6. One major face of the element is closed as shown at 8, while the other major face is open as shown generally at 10 in Figures 2 and 3 to provide a hollow structure completely open along one major face.
The exterior surface of the closed face 8 is provided with one or a number of cylindrical projections 12, and in the known building element shown in Figure 1, the projections 12 are provided in pairs lengthwise of the block.
The interior surface 14 (Figure 3) of the closed face 8 is provided with upstanding secondary projections in the form of gripping members 16 specifically adapted to resiliently engage and retain the cylindrical projections 12 of an identical or com-patible adjacent block when two such blocks are positioned in inter-fitting and interlocking relationship.
104~i'7ti7 One embodiment of gripping members very well suited to the satisfaction of the objects of the present invention is shown in Figures 2 and 3. Each of the gripping members 16 project from the interior surface 14 of the closed face 8 in which can be con-sidered parallel relationship with the planes of the end 4 and side walls 6, and the circular arcuate surfaces 18 coincide with a portion of an imaginary extension of the cylindrical projections 12 through the closed face and into the hollow cavity of the block. Figure 3 particularly well shows the positioning of the gripping elements 16 with respect to the cylindrical projections 12 carried on the other side of the closed surface 8 and which are shown in broken lines. Specifically, the circular arcuate sur-faces 18 of the engaging elements 16 define a portion of the cir-cumference of imagined extensions of the cylindrical projections and it will be appreciated from Figure 3 that when the closed face 8 of one block carrying projections 12 is mated to the open face 10 of a block as shown in Figure 3, that the projections 12 will be snugly and resiliently received between the gripping members 16 and the interior surface of adjacent side walls 6 of the block.
Stated in other terminology, a circular arcuate sur-face 18 has a radius equal to the radius of the cylindrical pro-jection 12 with the central axis of a circular arcuate surface being coaxial with the axis of a cylindrical projection.
It will be seen that the gripping members 16 are also provided in pairs longitudinally of the block, and the pairs of gripping members 16 may be strengthened if desired by the provision of bridgingmembers 20. ~hile Figures 2 and 3 show the presence of bridging members 20, the members 20 can be omitted as preferred.
While the circular arcuate surfaces 18 of the middle pairs of gripping members 16 may define a circular segment of 180 , it is preferred that the sutended arcuate surfaces be substantially 150 as represented by angle ~ in Figure 3. It has been found that a subtended arc of substantially 150 provides excellent resilient gripping of the cylindrical projections 12 so that the 1~)46767 blocks are firmly held together and will not inadvertently separate and yet may be relatively easily separated when such is desired.
The end pairs of the gripping elements may have a shorter arc than the middle pairs whereby when cylindrical pro-jections 12 are inserted in contact therewith the cylindrical pro-~ections are resiliently held between the shortened arcuate sur-face and adjacent side walls of the block.
A further embodiment of gripping members is shown in Figures 4 and 5 and where each gripping member 16 is individually separate without the provision of any bridging member, and the arcuate surfaces 18 of the end pairs merge smoothly with the end walls 4 of the block as clearly shown in Figure S.
In order that the gripping members 16 may more snugly and resiliently engage the cylindrical projections 12, it is sug-gested that the outwardly facing edges 22 of the gripping members inclined outwardly in a manner as shown in Figure 6. In this Fig-ure, the amount of lateral inclination of the side edges 22 of the gripping elements is shown by angle~ and an angle of 10 has been shown to provide an excellently resilient and yet durable gripping member configuration.
A further embodiment of the inventive concept is illus-trated in Figures 7, 8, and 9, and from Figure 9, it will be ap-preciated that the side edges 24 of the gripping elements angle uniformly inwardly in the direction towards the open face of the block for the purpose of providing a durable and long lasting unit. An angle of ~ of about 25 has been found most satisfactory.
The block according to Figures 4 through 9 may be pro-vided with bridging members such as shown in Figure 3 if desired, although it is considered that such strengthening means are not necessary with either of these embodiments.
Half blocks, or quarter blocks, or eighth blocks, such as shown in Figures 10, 11, 12, and 13, respectively, are also 1~46767 particularly well suited for the application or any of the em-bodiments of the gripping members of the present invention, as shown in Figures 2 through 9, inclusive.
Figure 4 shows a thinner building element, the depth of which is preferably a fraction 1/4, 1/3, 1/2, etc., of the height of the standard element whereby, if desired, like units can be combined together to provide a standard building unit or of course for other suitable erection applications. The gripping members carried by block such as shown in Figure 14, may be simi-lar to any of the engaging elements such as discussed above withrespect to Figures 2 through 9, inclusive.
Blocks other than square or rectangular may also include the novel engaging aspects of the present invention, and Figure 15 shows by way of example only a building element having an in-clined surface 26 which may be used for example in the construct-ing of the roof segments of a building structure. Any of the embodiments of Figures 2 through ~ can with modification be used with the block configuration shown in Figure 15.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A hollow building element of rectangular parallel-opiped configuration having side and end walls, and one open face, and one closed face having interior and exterior surfaces, at least one cylindrical projection on the closed face exterior surface, and at least one gripping member within the hollow element extending from the closed face interior surface substan-tially to the plane of the edges of the side and end walls at the open face, the gripping member having a circular arcuate surface with a radius equal to the radius of the cylindrical projection, the central axis of the circular arcuate surface being coaxial with the axis of the cylindrical projection, whereby when two compatable blocks are positioned to-gether a cylindrical projection on one block is received and resiliently held between the circular arcuate surface and an adja-cent side wall.
2. An element according to claim 1, including a number of cylindrical projections arranged uniformly in pairs along the closed face exterior surface, and including an equal number of correspondingly paired circular arcuate surfaces.
3. An element according to claim 2, wherein the arc-uate surfaces open towards adjacent side edges of the block.
4. An element according to claim 2, wherein the arc-uate surfaces of pairs gripping members open towards opposed side edges of the block.
5. An element according to claim 4, including a bridg-ing member extending between the gripping members of each pair.
6. An element according to claim 2, wherein at least some of the gripping members are free standing with side edges of the gripping members being obliquely angled with respect to the plane of an adjacent side wall.
7. An element according to claim 6, the side edges of the gripping members inclining outwardly from the closed face to the open face.
8. An element according to claim 6, the lateral edges of the gripping members inclining inwardly from the closed face to the open face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA240,023A CA1046767A (en) | 1975-11-19 | 1975-11-19 | Interlocking toy building element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA240,023A CA1046767A (en) | 1975-11-19 | 1975-11-19 | Interlocking toy building element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1046767A true CA1046767A (en) | 1979-01-23 |
Family
ID=4104558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA240,023A Expired CA1046767A (en) | 1975-11-19 | 1975-11-19 | Interlocking toy building element |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1046767A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0375544A1 (en) * | 1988-12-19 | 1990-06-27 | The Ritvik Group Inc. | Toy construction assembly |
| CN104487146A (en) * | 2012-06-13 | 2015-04-01 | 河田有限公司 | Toy block |
-
1975
- 1975-11-19 CA CA240,023A patent/CA1046767A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0375544A1 (en) * | 1988-12-19 | 1990-06-27 | The Ritvik Group Inc. | Toy construction assembly |
| CN104487146A (en) * | 2012-06-13 | 2015-04-01 | 河田有限公司 | Toy block |
| US20150174502A1 (en) * | 2012-06-13 | 2015-06-25 | Kawada Co., Ltd. | Toy block |
| TWI576142B (en) * | 2012-06-13 | 2017-04-01 | 河田股份有限公司 | Toy block |
| US9849398B2 (en) * | 2012-06-13 | 2017-12-26 | Kawada Co., Ltd. | Toy block |
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