Cassier's Engineering Monthly Volume 43

Cassier's Engineering Monthly Volume 43

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 edition. Excerpt: ... is made with the mains by means of flexible leads with plugs situated every 50 feet (15 metres). The cranes can be moved along the quay by means of a small trolley, carrying a 8 H.P. motor, which when coupled up with the travelling motion of the crane enables it to move at a speed of 75 to 100 ft. per minute. The cranes, except in a few cases, are of the portal type spanning two rail tracks. The jib is situated at a height of 42! feet above quay level. The outer wheel of the crane formerly moved over the granite coping, but, owing to the excessive wear which supervened, rails have been provided for the outer as well as the inner wheels. The heaviest cranes (4 to 8 tons) instead of travelling on four wheels, run on the rails by means of bogies with two wheels each. At Hamburg, the crane which has attained the best development and proved most successful is a semiportal crane of 3 tons maximum capacity. The lifting speed under full load is 120 ft. per minute, and the slewing speed, 6J ft. per second. The maximum outreach is 36 ft., and this is reducible by luffing to 26 ft. The smallness of the radius is due to the restricted conditions under which the cranes work, two and three cranes frequently operating jointly side by side. The lifting of the cargo from the holds is done by means of the ship's winches and the quay cranes only take charge from deck level. The shortening of the jib is effected by hand on the unloaded crane, by means of a rope winch with worm drive, the worm of which forms the nut for the axle of the jib itself. The motive power of the cranes is supplied by slow running, 4 pole motors of 26 H.P. With gear wheels and pinions in the ratio of 1:8, the driving motor makes about 210 revolutions per minute. The lifting, as well...
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Product details

  • Paperback | 326 pages
  • 189 x 246 x 17mm | 585g
  • United States
  • English
  • black & white illustrations
  • 1236787447
  • 9781236787446