公开(公告)号：US4514905A

公开(公告)日：1985-05-07

申请号：US535428

申请日：1983-09-26

申请人： William W. Lutzens

发明人： William W. Lutzens

IPC分类号： E21F17/18 ,  G01B5/30 ,  G08B21/00

CPC分类号： G01B5/30 ,  E21F17/185

摘要： An extensometer for measuring changes in the vertical distance between the roof and floor of a mine opening which comprises; a pair of rigid telescoping members, a tension spring securing said members to each other in a telescoping relationship, a hook for attaching a non-extensible cable to each of said members, and an indicator for determining telescopic movement of said members. The extensometer of this invention is utilized by securing one of said telescoping members to the roof of the mine and the other telescoping member to the floor of the mine with the axis of said members being disposed along the vertical. The telescoping members are secured, under tension, to the mine roof and floor by means of a non-extendible cable such as a steel cable. The indicator for determining the telescopic movement of the members may be a pair of lugs or flanges or other indicating marks, each member of which pair is affixed to a separate telescoping member.

摘要翻译： 一种用于测量矿井开口的屋顶和地板之间的垂直距离变化的伸长计，包括： 一对刚性伸缩构件，拉伸弹簧，其将所述构件以伸缩关系彼此固定，用于将不可延伸的电缆连接到每个所述构件的钩以及用于确定所述构件的伸缩运动的指示器。 通过将所述伸缩构件中的一个固定到矿井的顶部并且将另一个伸缩构件固定到矿井的地板上，利用所述构件的轴线沿垂直方向设置本发明的引伸计。 伸缩构件通过不可延伸的电缆（例如钢缆）在张紧下固定到矿顶和地板。 用于确定构件的伸缩运动的指示器可以是一对凸耳或凸缘或其他指示标记，其中每个构件对被固定到单独的伸缩构件。