US701300A - Valve-gear. - Google Patents

Description

No; 701,300. Patented June 3, I902.

s. & w. s. GRAIN.

VALVE GEAR.

(Application filed Mar. 2, 1901.) (N0 M0d0l.) 2 Sheets-Sheefl I.

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No. 70|,300. Patented June 3, I902.

S. I. &' W. S. GRAIN.

VALVE GEAR.

(Application filed Mar. 2,1901.) (No Model.) 2 Sheets$heet 2.

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SIDNEY IRVIN GRAIN AND WVALTER S. GRAIN, OF CINCINNATI, OI-IIO, AS- SIGNORS OF ONE-THIRD TO STEIVART SHILLITO, OF CINCINNATI, OHIO.

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SPECIFICATION forming part of Letters Patent No. 701,300, dated June 3, 1902.

Application filed March 2, 1901, Serial No. 49,628. (No model.)

To 00% 1071,0121, it may concern.-

Be it known that we,-SIDNnY IRVIN GRAIN and WALTER S. GRAIN, citizens of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invent ed certain new and useful Improvements in Valve-Gears,of which the following is a specification.

The object of our invention is toprovide an improved valve-gear by means of which an engine may be controlled and reversed while in motion; and our invention consists of the combinations and arrangements of parts hereinafter described and claimed.

In the drawings, Figure 1 is a vertical section of a steam-engine equipped with a valvegear embodying our invention; Fig. 2, a horizontal section corresponding to Fig. 1; Fig. 3, a vertical section corresponding to Fig. 1, but showing the engine reversed; Fig. 4, an enlarged sectional elevation of the valve-gear; and Figs. 5 and 6 an enlarged section and end View, respectively, of the valve.

Reference-letter A denotes a casing; B, a driven shaft; G G, crank-arms for driving shaft B; D D, piston-rods connected with crank-arms C C; E E, pistons connected with piston-rods D D; F F, cylinders in which pistons E E operate; G, a valve; H, a valvechamber; J J, ports leading from the valvechamber to the cylinder; K, a valve-rod; L, a valve-actuating eccentric, and M a collar slidably mounted on shaft B and utilized for shifting eccentric L.

The shaft B, crank-arms C C, piston-rods D D, pistons E E, cylinders F F, valve G,-

valve-chamber H, ports J J, and valve-rods K K are the usual working parts of a steamengine and operate as follows to produce rotations of shaft B: Referring to Figs 1 and 2, steam is admitted to valve-chamber H through opening h, where it passes through port J to cylinder F, driving piston E in the direction indicated by the arrow. In the meantime cylinder F is being exhausted through port J and opening 71/. At the proper time in the cycle of operations valve G throws cylinder F into communication with the live steam and exhausts cylinder F through its central longitudinal openin g g and opening h in valvechamber II.

The motion of the valve G is controlled by eccentric L, carried by block Z, which is pivoted to crank-arm C by pin c, which is coaxial with crank-pin 0. upon one side and carries a bell-crank lever N, having an arm n with a bearing in eccentric L and arm n with a bearing in collar M. On the end of arm n is a ball of, partially inclosed by the concave surface of washers r1 which ride inthe centrally-located slot Z in eccentric L. The outer end of arm a is round ed, as shown, and engages slot on in collar M. At Z eccentric L is cut away to permit it to swing on pin 0 to either'side of shaft B, and at Z it is slotted to permit the passage of shaft 13 in placing it in or removing it from position. Ring Z and bent arm Z" serve to connect eccentric L with valve-rod K. Collar M is splined to shaft B'i. a, is free to slide longi- 7o tudinally thereon while rotating therewith and is operated by means of fingers 0, which engage channel m and are carried by shaft 0. It will be seen that by means of fingers o and collar M eccentric L may be swung to and from and across shaft B and that owing to the fact that it is pivoted in the crank-line its positions on either side of the shaft will be symmetrical with respect to thatline, and for corresponding positions on opposite sides of the erly locating the pivotal point the proper angle may be obtained for cut-oft lead and lap.

In operation, when it isdesired, reverse the direction of rotation of shaft 13, as indicated in Fig. 1. The eccentric Lis swung on pin 0 to the other side of the shaft by means of fingers 0 on shaft 0, as shown in Fig. 3. IVhen it is desired to shorten the stroke of valve G, and consequently reduce the supply of steam to the cylinders, the eccentricity of eccentric L is reduced by swinging it toward shaft B, and when it is desired to completely shut off the supply of steam the eccentric is swung to Shaft 13 isflattened 55 It will also be observed that the 85 a central position, the permanent eccentricity due to the mounting on pin 0 being equal to the lap of the valve.

While We have illustrated our invention as applied to two single-acting cylinders, its application is obviously not limited to that construction.

We-claim as our invention- The combination of a crank-shaft; an eccentric pivoted in the line of the crank, permanently eccentric to the extent of the lap of the valve, to swing across the crank-shaft; a collar splinecl t0 the crank-shaft; a flattened surface on the crank-shaft a bell-crank lever

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