The eccentric in a special relation to the shaft and the engine crank

Steam-Engine Reversing-Gear

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Specification forming part of Letters Patent No. 223,632, dated January 20, 1880. Application filed May 28, 1879


Be it known that I, William Baxter, of the city of Newark, in 'the county of Essex and State of New Jersey, have invented a new and useful Improvement in Steam Engine Reversing-Gears, which improvement is fully described in the following specification.

My invention relates to an improvement in steam engine reversing gears and cut offs for reciprocating engines; and it consists in a novel mode of securing a shifting eccentric upon the crank shaft of the engine, and in a peculiar device for shifting the eccentric while the engine is in motion, to reverse the motion of the engine or alter the center of cutting off, and in setting the center of the eccentric in a special relation to the shaft and the engine crank.

Figure 1 of the drawings is a side view of a crank shaft provided with my improved eccentric. Fig. 2 is a plan of the shaft with the traveler and clutch ring. Fig. 3 is an end view of the crank shaft, showing the traveler fitted thereon and the eccentric in its central position. Fig. 4 is a similar view, showing the eccentric at one extreme position; and Fig. 5 is a detached view of collar c.


Steam-Engine Reversing-Gear.

No. 223,632., Patented Jan. 20, 1880.

The eccentric a is mounted upon the shaft between two collars or flanges, b c, the collar b being secured to the shaft and provided on the side toward the eccentric with V shaped ribs f, which fit into corresponding grooves g in the slide of the eccentric, while the collar c is held firmly beside the eccentric by a clamp screw or screws tapped through the collar and pressed against the crank shaft e.

Other set screws, d', with tapering points i, are fitted into the collar c, and are applied to tapering holes in the shaft in such a manner as to draw the collar toward the eccentric at pleasure, to compensate for wear upon the ribs f.

The eccentric has a slot h, formed in it, through Which the shaft e is passed, and the slot being parallel with the ribs f, the eccentric is easily moved across the shaft between the collars b c. The crank shaft is both enlarged and flatten, ed where it passes through the slot h, and formed with a groove or seat, m, to receive a key of peculiar construction, which will be hereinafter described. The slot h is arranged at ring-ht angles to the direction of the driving crank j, and being formed of sufficient length, the eccentric can be moved far enough from its central position to move the engine valve its full stroke for the backward or forward motion.