Permanent Way Rolling Stock and Technical Working of Railways; Rolling stock and traction, and atlas of 109 plates

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. 1878 Excerpt: ... two parts like eccentric clips; one of them carries an appendage with counterweight, which brings back the centre of gravity on to the throat taken by the chain of the crane. The central part of this sort of star is heated in a particular furnace alone where it is exposed to the action of the flame; a small wall of earth raised in the spaces of the spokes keeping the rest from the action of the heat. As the collar opposes the expansion of the system, there results, between the faces of the boss and of the spokes, brought to a high temperature, a very considerable pressure which perfectly prepares the welding; this is completed by three or four blows of the steam hammer, which terminate at the same time the shaping of the boss (and of the crank if there is one) as well as of the inside ends of the spokes. The collar now useless is removed, and the spokes cleaned off. 4. Rim.--The rim is a ring obtained by the same process, as the wrought iron or puddled steel tyres, called: weldless. A packet of No 4 iron, is rolled out into a flat bar, and then wound round a core, which is slightly conical, so as to facilitate taking off the helix. The annular packet is reheated, welded together in a mould, under the 15 ton hammer, reheated again, and twice rolled (reducing and finishing) in the circular rolling mill by hydraulic pressure. The notches which receive the shaped out ends of the spokes are then made on the inside face by the plotting machine. 5. Welding the spokes and the tyre.--The star lowered horizontally by the crane, slips down into the rim, the ends of the spokes lodging in the notches. For some, the joint is tight, and wants a little help with the hammer; for others, the joint is on the contrary a little loose, and small pieces of sheet iron have to be ...