| 摘要 |
The variable-mass frame for flat structures has a knot element (1) utilizing four arms (2) serially hinged one to another by interaction of respective crown wheels (22) exhibited by the arms (2) at one end (21), at which one end (21) the arms (2) are constrained one to another by a plate (3) exhibiting four pivots (31) defining four rotation axes (A1, A2, A3, A4) for the crown wheels (22); the surface mass of the knot element (1) being varied by nearing or distancing free ends (23) of the arms, which free ends (23) are opposite to said first ends (21). <IMAGE>
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