| 摘要 |
PCT No. PCT/FI91/00145 Sec. 371 Date Nov. 4, 1992 Sec. 102(e) Date Nov. 4, 1992 PCT Filed May 9, 1991 PCT Pub. No. WO91/17905 PCT Pub. Date Nov. 28, 1991.A trolley-type power supply means and a turntable switch for moving apparatuses such as mining equipment. The switch is provided with two coupling portions installed in parallel with each other and reversely symmetrical with respect to a turning axis. By using coupling portions, a trolley can be turned in a desired direction or shunted from the trolley track to allow another trolley to pass by. |
