| 摘要 |
<p>Each of the spreading frame elements is assembled of six round metal segments (31, 32, 33, 34, 35, 36) swivel mounted to each other and to the element sliding along the handle stick in order to be folded into a short object for transport and storage. The new design of a spreading element contains also six round segments (31, 32, 33, 34, 35, 36), but five of them (31, 32, 33, 34, 35) are flattened at their outer ends and the first segment (31) is also provided with flat center area. Two pulling wires (341, 351) with curved areas in the center joined with a ring to the appropriate metal segment (34, 35) and two straight wires (321, 331) are part of the frame.</p> |
