Handbook of Mining Details

Handbook of Mining Details

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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. 1912 edition. Excerpt: ...enough to hold 9 tons, but only three cars, a skip load, are dumped in at a time. The pocket is lined with steel, on top of which, both on the sides and bottom, wearing plates are bolted. The steel bottom plate rests on a cast-iron bottom plate 4 in. thick which in turn rests on a bottom of 12X 12-in. timbers, as trouble was experienced with the steel bottom plate when it rested directly on the timber bottom on account of the size of the boulders--some weighing a ton and a half--that are dumped from the cars into the skip pocket. This skip pocket has a hand-operated swinging door as shown in Fig. 103. The door piece A is hinged at the top, the strain on the hinge seats being carried back to rock wall of the pocket pit by means of two bolts equipped with turnbuckles. A lever, B, leads back from this door to the main locking lever, C, to which it is connected by a pin joint. The door as it swings back after it is released by easing on the band brake (with which the shaft of the locking lever is equipped so as to prevent the return of the door before the pocket has emptied itself, as might be the case if there was much fine ore in the pocket) forces this locking lever past dead center so that the weight of the ore pressing against the door holds the lever against the inside stop that limits its downward motion. The outward swing of the door is limited by the locking lever coming in contact with a similar stop at the other end of its range of travel. In case that this lock FIG. 103.--DETAILS OF A STEEL ORE POCKET IN RED JACKET SHAFT. ing lever sticks so that a man cannot conveniently start it by a moderate lift on its outer end, the skip tender resorts to the use of a wooden auxiliary lever that is fastened to the back post of the pocket so as to aid...show more

Product details

  • Paperback | 120 pages
  • 189 x 246 x 6mm | 227g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236633792
  • 9781236633798