| 摘要 |
A manipulative puzzle which comprises a first member and a second member pivoted for rotation in relation to said first about an axis which comprises a sequence of projectional units in line longitudinally of said axis, each unit engaged to one of said members for rotation relative to the other one of said members about said axis, which comprises a releasable fastening device holding said members mutually engaged longitudinally of said axis, which comprises a set of annular elements, each element defining a bore and defining a keyway at the periphery of the bore which displays a form in which said elements are coaxially pinned for rotation about said axis, in which certain rotations of said second member relative to first permit respective rotations of an exclusive lot of said elements, the make up of which lot is variable by movements of said elements longitudinally of said axis in relation to said members and by which through a placement of said keyway, said members may be withdrawn from said bore. Even upon the destruction of said form by the withdrawal of said members from said bore, said fastening device confines each of said members at each end of said sequence to a rotatable position in relation to the other member at a controlled distance from said axis and thereby said units of said sequence are rotationally engaged.
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