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Reversibly expandable doubly-curved truss structure

DC
  • US 4,942,700 A
  • Filed: 10/27/1988
  • Issued: 07/24/1990
  • Est. Priority Date: 10/27/1988
  • Status: Expired due to Term
First Claim
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1. A loop-assembly comprising:

  • at least three scissors-pairs, at least two of the pairs comprising;

    two essentially identical rigid angulated strut elements, each having a central and two terminal pivot points which do not lie on a straight line, each strut being pivotally joined to the other of its pair by their central pivot points,each pair being pivotally joined by two terminal pivot points to two terminal pivot points of another pair such that both scissors pairs lie essentially in the same planewhereby a closed loop-assembly is thus formed of scissors pairs, and this loop-assembly can freely fold and unfold without bending or distortion of any of its elements, anda normal line that intersects and is perpendicular to the axes of any two terminal pivot points is non-parallel with at least two other similarly formed lines in the assembly,the angles formed between said lines remaining constant as the loop assembly is folded and unfolded.

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