Minutes of Proceedings of the Institution of Civil Engineers Volume 166 (Paperback)

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. 1906 edition. Excerpt: ... shown in Fig. 18, Plate 5. It is an adaptation of the Blanton form of cam-shaft (Fig. 19, Plate 5), but whereas in the Blanton system a tightening-wedge is inserted between the cam and the cam-shaft, in the system illustrated in Fig. 18, Plate 5, the studded wedge is replaced by a swelling on the shaft. Blanton Cam-Shaft.--The Blanton cam-shaft (Fig. 19, Plate 5) is made of mild steel or faggoted iron, and has holes drilled in it at appropriate intervals to give the required drop, the cams being made all alike. The cam-shaft pulley is usually keyed to the shaft as shown, but sometimes it is fixed with a Blanton taper-bushing like the cams. The " New" Blanton cam-shaft (Figs. 20, Plate 5) has its circumference divided into ten taper-faces corresponding to the ordinary taper-bushings, and the cam (Fig. 21, Plate 5) is made with ten slots accurately divided to fit these faces. It is evident that this construction gives great flexibility in the arrangement of the cams on the shaft, whether for a five-stamp or a ten-stamp unit, and for any drop. The stress on the boss is much more evenly distributed than with the older single-taper bushings. The ends of the shaft are, of course, turned, to form the journals and to receive the collars and cam-shaft pulleys. The ordinary Blanton taper-bushing is shown for the attachment of the pulley. In the earlier types of cam-shafts, two key-seats were cut along almost the whole length of the shaft, and the positions of the cam on the shaft's circumference were fixed by so disposing the key-ways in the hub of the cam as to give the proper circumferential distribution. This type of cam-shaft has, however, become a thing of the past. It presents such practical difficulties in working as the...