Transactions . fts: 1,500 feet and deeper. DISCUSSION—GUIDES FOR CAGES. 25 Mi*. Herbert Perkin (Leeds) wrote that, in dealing with theconstruction of rope guides, Mr. Eoutledge did not mention thewellknown locked-eoil guide rope, which seemed to be the mostsuitable as presenting a perfectly uniform wearing surface. Agood form of clamp (figs. 23 and 24) was in use at the Slielton Coaland Iron Company, Limiteds deep pit at Hanley, Avhere ropeguides were in use in a shaft 2,550 feet deep. It consisted of arectangular block-forging in which a slot was cut, and twowedges, gripping the rope, were fi
Transactions . fts: 1,500 feet and deeper. DISCUSSION—GUIDES FOR CAGES. 25 Mi*. Herbert Perkin (Leeds) wrote that, in dealing with theconstruction of rope guides, Mr. Eoutledge did not mention thewellknown locked-eoil guide rope, which seemed to be the mostsuitable as presenting a perfectly uniform wearing surface. Agood form of clamp (figs. 23 and 24) was in use at the Slielton Coaland Iron Company, Limiteds deep pit at Hanley, Avhere ropeguides were in use in a shaft 2,550 feet deep. It consisted of arectangular block-forging in which a slot was cut, and twowedges, gripping the rope, were fitted into the slot. Above this,with a slight gap in between, two or three clamps of the ordinarybolted type were fixed on the rope, the gap being used to indicatewhether any slip was taking place. In the sump, the method ofattaching the weights was simply the reverse of the arrangementused in the headgear. This method had been found eminently satis-factory. With regard to the weights hung upon the conductors,. : 71 m Fig. 23.—Side Elevationof Clamp. Fig. 24.—Plan of , 1 Foot to 1 Inch. the limit, of course, Mas reached when further increase woulddangerously lower the factor of safety: this should not be below5, that was, the attached weights together with the weight ofthe hanging rope should not be more than one-fifth of the break-ing load. The clearance of 18 inches between the cage-corners andthe shaft-wall was certainly most important, because of the possi-bility of a bulging of the shaft taking place, and 15 inchesbetween the centre guides were ample. He (Mr. Per kin) could not agree with Mr. Kennedys con-clusions that wooden guides were either as safe, as efficient,or economical as rope guides for great depths. It seemed avery dangerous plan to fill a downcast shaft with timber,especially if electric cables were taken down the pit. The boltedjoints were also a source of danger. Mr. Kennedys addition of 26 DISCUSSION GUIDES FOR CAGES. £1 per foot for t
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1887
