working group for imbullonatrice perfected and imbullonatrice adopting party this working group

摘要

The work unit (19) has the task of placing and fastening nuts (36) on bolts (44) already positioned (13) together with clips and washers on rails (12), and comprises two wrench means (20-21) positioned in series, of which the first (20) performs at least the prescrewing of the nut (36) onto the bolt (44), whereas the other (21) carries out the final tightening of the nut (36). The invention also concerns a platelayer waggon (10) for rails which employs such improved work unit (19).