This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 Excerpt: ...also employed (a, Fig. 290). It may be considered as Q. a prolongation of the winding rope, but is shorter than the vertical distance from the capping to the top of the cage. To it is attached an apparatus, b, shown enlarged in Fig. 291. The central bridlechain is connected to a stirrup, o, while the pin, b, is ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 Excerpt: ...also employed (a, Fig. 290). It may be considered as Q. a prolongation of the winding rope, but is shorter than the vertical distance from the capping to the top of the cage. To it is attached an apparatus, b, shown enlarged in Fig. 291. The central bridlechain is connected to a stirrup, o, while the pin, b, is attached to the cage. Threaded on this pin are alternate discs of sheet-iron, c, and india-rubber, e, kept in proper place by the nut and locknut at the top of the pin, b; both india-rubber and sheet-iron discs are enclosed in a cylindrical case, d, to protect them from dirt, kc. When the lift commences, the central chain, being shortest, does all the work, the stirrup, o, slides on the spindle, b, and compresses the india-rubber discs, until the central chain lengthens to such an extent that the corner chains come into operation and do their share of work. Instead of this arrangement, volute springs are sometimes employed, and have been used at Mariemont, but were abandoned through unreliability, as they often broke and caused mishap. The weight of such a rope-easing gear, including the central chain, two angle pieces across the top of the cage, and all the iittings caused by the addition, is only 71 lbs., and its cost is small. In some cases india-rubber blocks have been placed beneath the pulley pedestals, but, being exposed to the weather, the blocks soon become hard and lose their elasticity. A superior plan is to place the pedestal on springs similar to those used in railway waggons. Fig. 292 shows such an arrangement at Bell End Pit. The pedestals, a, work in guides, b, and have a play of about 2 in. The guides compel the pulley to travel in a vertical plane anil prevent it from canting. A stop, c, is provided underneath the spring to prevent ...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.