Bridge mill for cold rolled steel tractor in the form of vergalhoes or wire

摘要

In a device wherein rod or wire is cold worked to provide it with one or more series of ribs thereon by being passed through three profile rolls simultaneously pressing against the rod or wire, a single drive is provided for said profile rolls, comprising a primary drive shaft and two secondary drive shafts at 60 DEG to each other and to the primary drive shaft. Each of the shafts for the profile rollers is driven from its corresponding primary or secondary drive shaft and each of said shafts for the profile rollers is pivotally mounted with respect to its primary or secondary drive shaft. Means are provided to releasably hold the pivotally mounted profile rollers against the rod to be worked regardless of variations in diameter along the length of such a rod.