| 摘要 |
A sheet is disclosed for forming a plurality of coupling bands for connecting the ends of corrugated drain tubes having external grooves. The sheet includes a plurality of parallel lines of hollow lugs. The lugs are separated from each other by an integral web of plastic material. The lugs in each line are spaced sufficiently to allow the resulting coupling bands formed from the sheet to bend freely about the drain tubes to which the couplings are applied. Each line of hollow lugs includes a plurality of spaced-apart columns of hollow lugs aligned in end-to-end relation. Each column includes, in sequence, a first end lug formed to include a flat end wall upstanding in substantially perpendicular relation to the plastic web, a plurality of intermediate lugs of generally frustro-pyramidal shape, and a second end lug formed to include a flat end wall upstanding in substantially perpendicular relation to the plastic web. The aligned columns of each of the parallel lines of hollow lugs are arranged to align said border areas thereby to define a plurality of parallel spaced-apart avenues in the web. The web avenues are aligned in perpendicular relation to the lines of hollow lugs. The sheet is formed with the intermediate transverse cut lines situated in the web avenues so that the sheet can be cut to provide coupling bands of selected lengths to fit tubes of varying diameters.
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