公开(公告)号：US4784532A

公开(公告)日：1988-11-15

申请号：US63945

申请日：1987-06-19

申请人： Kenneth D. Prescott

发明人： Kenneth D. Prescott

IPC分类号： E21D23/00 ,  E21D23/06 ,  E21D17/05

CPC分类号： E21D23/0043 ,  E21D23/06

摘要： A roof engaging structure for a mine roof support comprises at least two relatively movable roof engaging members 21 and 23, which are coupled together by at least two spaced-apart pivotal joints 25 and 26. The pivotal joints combine to influence the relationship of the roof engaging surfaces of the two members. In one embodiment for example, the roof engaging surfaces of the two roof engaging members may adopt either an angular or a parallel relationship with respect to one another, one surface lying at least partially below the adjacent surface. The arrangement enables the roof engaging structure to shape itself to various forms of mine roof, while preventing jack knifing of the forward end of the roof engaging structure.

摘要翻译： 用于矿山屋顶支撑件的屋顶接合结构包括至少两个相对可移动的屋顶接合构件21和23，其通过至少两个间隔开的枢转接头25和26联接在一起。枢转接头组合以影响屋顶的关系 两个构件的接合表面。 在一个实施例中，例如，两个屋顶接合构件的屋顶接合表面可以相对于彼此采用角度或平行关系，一个表面至少部分地位于相邻表面下方。 该布置使得屋顶接合结构能够将自身的形状自身形成为各种形式的矿顶，同时防止顶部接合结构的前端的千斤顶切割。