发明授权
US3729921A Non-rotating rope with spiral strands 失效
非旋转绳索具有螺旋状结构

Non-rotating rope with spiral strands
摘要:
The present rope is torsion free mainly because it has an inner rope formed by an inner layer of strands which is surrounded by an outer layer of strands and since the inner rope is constructed of at least three flattened strands and at least three round strands which are smaller than the flattened strands to fill the spacings between adjacent flattened strands. The inner strands surround a center member of elastic material.
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