| 摘要 |
A duct ( 10 ) is made up of a plurality of layers ( 11, 12, 13 ) of pliant material. The layers ( 11, 12, 13 ) are attached by stitching ( 20, 22 ) to form pockets ( 23, 24 ) between adjacent layers. One of the layers ( 11 ) is wider than the others and extends over the lateral edges ( 17, 19 ) of those layers ( 12, 13 ), and when the stitching ( 22 ) is applied, a loop ( 21 ) is formed. The loop ( 21 ) receives a strength member ( 26 ) which may be engaged by a clamp ( 31 ) carried by a bracket ( 34 ) which may be attached to a utility pole ( 30 ) to carry the duct ( 10 ) overhead. In another embodiment, a duct ( 40 ) includes enclosed loops ( 41, 42, 43 ) forming pockets ( 50, 51, 52 ). Stitching ( 54 ) connects the loops ( 41, 42, 43 ) and forms another loop ( 55 ) to receive a strength member ( 56 ). In yet another embodiment, the layers ( 61, 62, 63 and 64 ) are of different lateral widths, and the longest layer ( 64 ) extends around one of the edges of the other layers ( 61, 62, 63 ) to form a loop ( 71 ) when stitching ( 65 ) is applied. The loop ( 71 ) receives the strength member ( 73 ).
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