| 摘要 |
An improved covered backwasher for attaching an engaging member having at least one set of band-shaped prongs to a piece of material. The improved backwasher includes a frontplate having at least one pair of spaced-apart openings therein and a backplate having a recess therein opposite each opening in the frontplate for curling the prongs of the engaging member as they are inserted into the backwasher. The improvement resides in providing at least one rib member on the backplate adjacent the recesses for abutting portions of the edges of the prongs, thus effectively preventing turning of the engaging member relative to the backwasher.
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