| 摘要 |
A power feed chain has two chain bands and a plurality of connecting struts. The strut construction resists twisting, so as to hold the two chain bands parallel to one another and in longitudinal alignment. It is in the form of a lightweight but rigid grid, comprising two cross-ties consisting of strips of flat material arranged in parallel planes, and a plurality of spacers of flat material which extend between the cross-ties and are arranged in parallel planes that are perpendicular to the planes of the cross-ties. Each spacer has in each of its long sides a relatively deep notch which has parallel sides and which fits around one of the flat cross-ties, so that the spacers and cross-ties form a rigid torsion-resistant grid frame.
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