Friction yoke for yielding arch mine support has yokes slidably fitted to same profile so hooks bear on channel on profile face here acting as thrust lever to discount transverse forces in pressure screws under strata load.

摘要

The friction yokes (50-53) fitted slidably (9) to the same arch profile (15) retain their several functions despite strata loading so that even should the slide join (9) spread, the sides of locking hooks bear with their supporting faces on the yoke clamp part below the clamping channels on the outside of the respective support profile here acting as thrust lever. Transverse forces in the pressure screws are avoided by means of their sliding fit in the reversal leg (48). This enables yokes with several screws to be fitted. The locking edges and/or weld beads stand at right angles to the length of the profile leg and the head of the hook (11) is radial to the leg or again raised in arch section and fitted with external locking edges.