YIELDABLE ROOF SUPPORT SYSTEM

摘要

A support (10) includes a base member (12) having an open end (14) and a hollow interior (16), a forcing member (18) having an end (22) extending through the open end (14) of the base member (12) into the hollow interior (16) thereof and having threads (20) thereon and a mandrel (40) or sliding nut capable of engaging the threads (20) of the forcing member (18) at an adjustable position and providing an interfering relationship between the base (12) and forcing members (18) as a compressive load is applied thereto. The support (10) is particularly adapted for use in supporting the roof of a mine.