. American engineer and railroad journal . anics Association, and possibly therailway clubs, would tend to make it official as well. The termsnow creeping in are good enough as localisms, but they willnot prove satisfactory for general use. F. M. Whyte, New York. Mechanical Engineer. N. T. C. & H. R. R. R. THE DESIGN OF CONNECTING ROD ENDS. the usual practice, a. U-shaped block is placed back of the brasswith its flat portion bearing against the latter. The projectingends of the rod take a semi-circular gib which is threaded fora nut on its lower end to hold it securely. The key passesbetween
. American engineer and railroad journal . anics Association, and possibly therailway clubs, would tend to make it official as well. The termsnow creeping in are good enough as localisms, but they willnot prove satisfactory for general use. F. M. Whyte, New York. Mechanical Engineer. N. T. C. & H. R. R. R. THE DESIGN OF CONNECTING ROD ENDS. the usual practice, a. U-shaped block is placed back of the brasswith its flat portion bearing against the latter. The projectingends of the rod take a semi-circular gib which is threaded fora nut on its lower end to hold it securely. The key passesbetween the U-shaped block and the gib, and a keeper held bythe nut on the latter serves as a nut lock, and also holds a setscrew for the key. Fig. 2, reproduced from Vol. Ill of Maurice Demoulins TraitePratique de la Machine Locomotive, illustrates the type ofconnecting rod crank-end used for the outside cylinders of aclass of express compound locomotives belonging to the Prus-sian State Railways, and the feature of the design to which it is. —r^ I Fi£. 1. desired to direct attention is the method of fitting the closingblock in the fork, which relieves the bolt of shearing stress. A similar type of crank-end is employed by Signor Plancherfor the inside-rods of his 6-coupled, 4-cylinder compound expressengine, which was exhibited by the Southern Railway of Italyat the Vincennes Annexe of the Paris Exposition. In this case,however, the closing block, instead of the rear brass, is taperedfor the key, which, passing through the upper fork of the rod,is secured by a nut and lock nut bearing thereon. In all ofthe rods referred to, the keys at both ends of the rod arebehind the brasses which they close, which arrangement reducesthe change in length of the rod to a minimum. Both the Pennsylvania and the Prussian State Railways de- To the Editor: With the usual design of connecting rod crank-end of theopen or forked type, the closing block bolt is not only subjectedto the shearing stresses
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
