发明名称 Equipment and method for measuring convergence
摘要 A transducer is placed in a telescopic strut and connected to a roof cam and a floor cam. The cams are pivoted to a roof support and a constant load is applied to the cams by a gas spring. As convergence takes place a transducer in the telescopic strut records the relative movement between the floor and roof and transmits this as an electrical signal for analysis.
申请公布号 US4913499(A) 申请公布日期 1990.04.03
申请号 US19880271642 申请日期 1988.11.16
申请人 COAL INDUSTRY (PATENTS) LIMITED 发明人 SMART, BRIAN G. D.
分类号 E21D23/04;E21F17/18 主分类号 E21D23/04
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