Elements of Mechanism

Elements of Mechanism

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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. 1852 edition. Excerpt: ...THE HIE ENGINE. 165. This engine is used to drive piles into the ground for the support of the piers of bridges, or heavy walls, where the soil is not sufficiently firm to carry the structure, B is a heavy block of metal, usually about 10 cwt., called the ram, which being drawn up by a chain passing over the pulley p, falls by its own gravity upon the head of the pile p, and thus drives it into the ground. The ram is drawn up by a crab (described at the beginning of this Chapter), and at the end of the chain is a pair of nippers t, which lay hold of the loop at the top of the ram; r is a heavy sliding piece fixed on the nippers, and when the ram is drawn up to near the top of the frame A A Bb, the two forks s of the nippers are closed between the inclined stays Cd, en, thus causing the nippers to open below, which, releasing the loop, allows the ram to fall upon the head of the pile. The nippers are then allowed to fall by the weight of the sliding piece r, and they are so contrived as to fix themselves on the loop of the ram, which is thus prepared for another ascent. The height of the frame A B is usually from 20 to 30 feet. There are various other methods of constructing the pile engine, hut the one just described is the most commonly used. THE HAND JACK. 166. This machine is much used in raising large blocks of timber or stone through a short space, by builders; part of the case of the machine is open to show the wheel-work, &c. H is the handle, which turns the pinion a acting on the spur-wheel c; the pinion b, on the axle of c, acts upon the teeth of the rack B E, which is provided with a fork to lay hold of the beam or other material to be raised; and D is a detent to hold the rack as it is raised. The power of this machine may...show more

Product details

  • Paperback | 60 pages
  • 189 x 246 x 3mm | 127g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236572084
  • 9781236572080