. Bulletin. Science. Si Figure 4.—A 4-wheel safety truck fitted with A. F. Smith's swing-bolter centering device. Built by the Hinkley Locomotive Works. From Gustavus Weissenborn, American Locomotive Engineering and Railway Mechanism, New York, 1871, pi. 88. neously lifted ofT the track, the truck could pass over "quite a considerable ; ^ Bissell further claimed: In running on either a straight or curved track one of the truck wheels often breaks off, and the truck swivels around on its center pin in consequence, and throws the engine off the track, but with my device one
. Bulletin. Science. Si Figure 4.—A 4-wheel safety truck fitted with A. F. Smith's swing-bolter centering device. Built by the Hinkley Locomotive Works. From Gustavus Weissenborn, American Locomotive Engineering and Railway Mechanism, New York, 1871, pi. 88. neously lifted ofT the track, the truck could pass over "quite a considerable ; ^ Bissell further claimed: In running on either a straight or curved track one of the truck wheels often breaks off, and the truck swivels around on its center pin in consequence, and throws the engine off the track, but with my device one wheel, or even the two wheels on the opposite sides diagonally of the truck might break off and still the truck would not run off, because its position is set and it has no of motion around which it could swing. . The other problem Bissell wished to correct was the oscillation and chatter of the leading truck. This was accomplished by a simple centering device in the form of a pair of V-shaped double incline planes (D on fig. 3) situated at the center of the truck frame (A). The lower planes of the pair were fastened to the truck frame and the upper, cast in the form of a bridge, were attached to the locomotive frame (C) by a center plate. But while the portion of the locomotive's weight assigned to the leading wheels was borne at the center of the truck, as in the conventional design, the center plate was no longer the point of rotation. On a straight track the V's would be at their bottom position and thus prevent the truck from vibrating.'' When the locomotive entered a curve the planes allowed its forward weight to bear continuously on all four wheels, and at the same time controlled any exaggerated swing caused by centrifugal force. The centering device is thus explained in the patent specification (figure numbers are omitted): I therefore obviate this difficulty [the oscillation of the truck] by providing two inclined planes . . formed double as shown and of an a
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Keywords: ., bookauthorunitedstatesdepto, bookcentury1900, booksubjectscience
