| 摘要 |
Four elements are each provided with protrusions constituted by forks, the branches of which are resilient. Each fork is provided with a recess and with an embossment. The protrusions engage with each other, their embossments and their recesses hooking each other, and are thus assembled to each other around rotation axes. The series of protrusions and of the free spaces which separate them are arranged in such a way that the four elements can be articulated to each other two by two, that has for consequence they can be assembled together by engagement of the protrusions of any one element with those of another element. The protrusions on respective halves of each element are not arranged symmetrically, but they can be identical.
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