| 摘要 |
PCT No. PCT/JP87/01030 Sec. 371 Date May 18, 1989 Sec. 102(e) Date May 18, 1989 PCT Filed Dec. 25, 1987 PCT Pub. No. WO88/04942 PCT Pub. Date Jul. 14, 1988.An emergency descending device comprising a rotary wheel and a cam mounted between a pair of side plates, with a main rope passing between the rotary wheel and the cam. The rotation of the rotary wheel caused by the main rope generates a centrifugal force on a brake shoe, and the brake shoe tends to rotate a brake drum. The rotation of the brake drum rotates the cam toward the rotary wheel thereby clamping the main rope therebetween, and suitable descending speed can be obtained.
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