File:Railway master mechanic (microform) (1895) (14575081868).jpg

Identifier: railwaymastermec33newy (find matches)
Title: Railway master mechanic (microform)
Year: 1895 (1890s)
Authors:
Subjects: Railroads Railroads
Publisher: New York : (Simmons-Boardman Pub. Corp.)
Contributing Library: MIT Libraries
Digitizing Sponsor: Boston Library Consortium Member Libraries

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oped and tried, the most generally adopted ofthem to date is the Walschaert. A study of this gear in itssimple action will no doubt be of interest to the reader. head slides. One end of these guide bars is fastened by ayoke which supports the auxiliary guide bar for the valverod. On this yoke is fixed a rocker box. This bearing car-ries the rocker shaft, to which is fixed the link 1. This linkis pivoted on the rocker shaft in its center. In some prac-tice the link is operated by the link rod being attached to the rocker arm on the opposite end of the rock shaft fromthe link, or as in this illustration, the link rod is attached to the lower end of the link direct- In either event the actionis the same, and the method of application varies with therequirements. The curvature of the link is towards the steam chest, andthe radius is governed by the length of the radius rod, d,or from the center of link to the center of pin on lap andlead lever. One end of radius rod, d, spans the link and a
Text Appearing After Image:
Fig. 1. The principal features of this gear over the Stephensonlink are that it drives the valve directly, or is a direct valvemotion and has a constant lead under all conditions ofoperation. To understand this clearly, let us take up thestudy of the skeleton diagrams, the main features being de-scribed in Figure 1. Here A A is the center line of the cylinder, crossheadslides, and drive wheel axles. B, B, is the center of cross-head pin on the two extremes ana center of travel. C Cis the center of cylinder ports. D D is the center of valverod pin travel. The main crank is shown at a, the valvecrank at b, link rod at c, radius rod at d, lap and lead leverat e, radius link at f, valve rod at g, lifting arm at h, revers-ing rod at j, suspension rod at k, link at 1, and valve at m. The relative positions of the main crank pin, valve crankpin, fulcrum pin, valve rod pin and link block center for onecomplete revolution forward is shown at the figures 1, 2, 3,and 4. In the main we have the g

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