. American engineer . ch side frame.* Fig. 1 illustrates the general principle of a link motion deviceof this type that has been designed by A. Stoikowitz, of Mont- real, Que. .1 and B represent fulcrum points for the links Rwhich support oscillator O at points A and B. Point D willtravel on a straight line, when certain approximate proportionsbetween the dimensions fi, H, E, and C are met. The move-ment of point D denotes the side bearing travel which is com-paratively small, and as the angular movement of the pivotpoints is correspondingly small and lever C is greater than K,the frictional r
. American engineer . ch side frame.* Fig. 1 illustrates the general principle of a link motion deviceof this type that has been designed by A. Stoikowitz, of Mont- real, Que. .1 and B represent fulcrum points for the links Rwhich support oscillator O at points A and B. Point D willtravel on a straight line, when certain approximate proportionsbetween the dimensions fi, H, E, and C are met. The move-ment of point D denotes the side bearing travel which is com-paratively small, and as the angular movement of the pivotpoints is correspondingly small and lever C is greater than K,the frictional resistance resulting from these points will be smalland can be safely neglected. As the load is being carried onwhat might be called a floating support, the oscillator O pro-vides for a nearly frictionless horizontal and radial truck move-ment on a curve (Figs. 2 and 3), while the links or hangers Ralso allow sufficient lateral movement of the car body, as isthe case in a swing motion truck. Furthermore if D is pivoted. •For description of the Summers side bearing truckneer, April, 1912, pages 193 and 19-t. A,ncrico,i E„gi. Fig. 4—Link Principle Applied to Ordinary Side Bearing. to its fulcrum by a pin, it will form an effective anti-telescoping•Jevice, as, in case of an accident, it will prevent the cars beinglifted from their respective trucks. Fig. 2 shows the application of this device to a six-wheel pas-senger truck; the oscillator is U shaped and straddles the sideliearing arch as shown; the hangers are of the solid link typeand engage both the oscillator and the side bearing arch. Theanti-telescoping feature is applied by pivoting the top of theoscillator to the side bearing fulcrum by means of a 2 in. pin is under double shear and would require an enormousforce to tear a truck from its body, provided all the details in-volved are of equal or greater strength. Fig. 3 illustrates a standard arch bar truck with bolsters andcenter plates eliminated and the e
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
