초록 ▼

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 (1

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).

대표청구항 ▼

1. An aerial system adapted to carry cables between poles comprising a duct having a plurality of longitudinally extending layers of a pliant material, said layers having lateral edges, at least one longitudinally extending pocket formed between at least one set of adjacent layers, a longitudinally

1. An aerial system adapted to carry cables between poles comprising a duct having a plurality of longitudinally extending layers of a pliant material, said layers having lateral edges, at least one longitudinally extending pocket formed between at least one set of adjacent layers, a longitudinally extending pulling mechanism positioned in each said pocket, nothing other than said pulling mechanism being positioned in each said pocket, a loop formed adjacent to each said pocket, said loop being formed by one of said layers extending over said lateral edges of the other said layers, and a strength member received in said loop, said loop and said strength member being positioned to be engaged so that said duct may be carried by the poles.2. The aerial system according to claim 1 wherein said loop is formed of said pliant material.3. The aerial system according to claim 1 wherein said longitudinally extending pulling mechanism is a pull tape.4. The aerial system according to claim 1, wherein said layers are connected near said lateral edges so as to form each said pocket.5. The aerial system according to claim 4 further comprising stitching to connect said layers near each said lateral edges.6. The aerial system according to claim 5 wherein said stitching at one of said lateral edges also forms said loop.7. The aerial system according to claim 1 wherein said layers are of different lateral widths.8. A system adapted to be carried overhead by a pole having an arm attached thereto, and a clamp carried by said arm, the system including a duct comprising a plurality of longitudinally extending layers of a pliant material, said layers having lateral edges, at least one longitudinally extending pocket formed between at least one set of adjacent layers, a loop formed adjacent to each said pocket, said loop being formed by one of said layers extending over said lateral edges of the other said layers, and a strength member received in said loop, the clamp being adapted to engage said loop and said strength member.9. A duct comprising a plurality of longitudinally extending layers of material, each layer having a first lateral edge spaced from a second lateral edge, said layers being attached to each other near said first lateral edges, one of said layers having a portion passing over said second lateral edges of the other of said layers, at least some of said layers being attached to each other near said second lateral edges and attached to said one layer to form pockets between adjacent layers, said portion of said one layer thereby forming a loop adjacent to said second lateral edges of the other of said layers.10. The duct according to claim 9 further comprising a strength member positioned in said loop.11. The duct according to claim 9 further comprising a longitudinally extending pull tape positioned in each said pocket.12. The duct according to claim 9 wherein stitching attaches said second lateral edges of said layers to each other and to said one layer, said stitching thereby forming one lateral edge of each said pocket and forming said loop.13. The duct according to claim 9 wherein the attachment of said first lateral edges of said layers to each other also attaches the second lateral edge of said one of said layers to the first lateral edges of said other layers.14. A duct comprising a plurality of enclosed loops positioned adjacent to each other, said loops including layers of material forming pockets, an additional loop formed outside of said pockets by one of said loops, said additional loop having no layer in common with any of the other of said loops, and a strength member received in said additional loop.15. The duct according to claim 14 further comprising stitching to attach said enclosed loops to each other and to form said additional loop.16. The duct according to claim 15 wherein said one of said enclosed loops is larger than the other said enclosed loops.17. The duct according to claim 14 wherein said enclosed loops are formed of a pliant material.18. A duct comprising a plurality of longitudinally extending layers of material having lateral edges and being of different lateral widths, at least one longitudinally extending pocket formed between adjacent layers, the lateral edge of the longest layer extending around the lateral edges of the other layers thereby forming a loop adjacent to said lateral edges of the other layers, and a strength member received in said loop.19. The duct according to claim 18 further comprising stitching to attach the lateral edges of said layers to each other.20. The duct according to claim 18 wherein said layers are formed of a pliant material.21. An aerial system adapted to carry cables between poles comprising a duct having a plurality of pockets formed between adjacent layers of fabric and including a loop, said layers having lateral edges which are connected to form said pockets, one of said layers extending over said lateral edges of the other said layers to form said loop, a strength member positioned in said loop, and a clamp adapted to be carried by a pole and engaging said loop and said strength member so that said duct may be carried by the pole.22. The system of claim 21 further comprising an arm adapted to be carried by the pole, said arm being connected to said clamp.23. The system of claim 21 further comprising a longitudinally extending pull tape in each said pocket.24. An aerial system adapted to carry cables between poles comprising a duct having a plurality of pockets formed between adjacent layers of fabric and including a loop, said layers having lateral edges, one of said layers extending over said lateral edges of the other said layers to form said loop, means to connect said layers to form said pockets, said means to connect also forming said loop, a strength member positioned in said loop, and a clamp adapted to be carried by a pole and engaging said strength member so that said duct may be carried by the pole.25. An aerial system adapted to carry cables between poles comprising a duct having a plurality of pockets formed between adjacent layers of fabric and including a loop, said layers having lateral edges which are connected to form said pockets, one of said layers extending over said lateral edges of the other said layers to form said loop, and a strength member positioned in said loop, said loop and said strength member adapted to be engaged so that said duct may be carried by the pole.