USRE2328E - Improvement in cut-off valve-gear for steam-engines - Google Patents

Description

UNITED STATES ALBERT D. onoMBIE AND LUCY eoLBoInv,f 0FV BALTIMoEEM-ARYLAND,

PATENT OFFICE..

' XAND JOHN M. D. GREENE, OFZFUNKVILLE, PENNSYLVANIA, rASSIGNEES,

BY.lllESNE ASSIGNMENTS, OEWELLS L. COLBORN. V

IMPROVEMENT iN CUT-oFF VALVE-GEAR FOR STEAM-ENGINES.

Specification forming part of Letters Patent No. 41,810, dated March .1, 1864; Reissue No. 2,328, dated August 7, 1866. l

DIVISION B.

To all whom it muy concern: v

Be it known that WELLS L. GoLBoRN, of Elmira, in the county of Cheinung and State of New York, has invented a new and useful Improvement in Variable Apparatus for Operating (lut-Oli' Valves of l'SteamEngines5 and we do hereby declare that the following is a full, clear, and exact description thereof', ret? erence being had to the accompanying draw- YVings, making part Aof this specification.

- Figure 1 is a central longitudinal vertical section of the improved device, the lparts for:

operating the valve being' shown i-n elevation; Fig. 2, an end elevatiom thereof; Fig. 3, a transverse vertical section of the valve and case in the plane of linea x, Fig. 1; Fig. 4, a perspective view of the opera-ting parts detached 5 Fig. 5,- an elevation of the rock-lever and slide that operate the valve; Fig. 6, a transverse horizontal section of the operating parts in plane of line y y, Fig. l.

,Like letters of 'reference indicate corresponding parts in all the gures.

The object of this invention is to regulate the ilow of steam from the steam-pipe to the steam-chest, so as to equalize the action whether the pressure be greater or fless;

As represented 1n the drawings, A 1s a valve-ease, whose iiiductioii-opeiiin g a receives the steam from the stcan1-pipe, Aand whose Y eduction-ontlet b discharges it into the steamohest, whence it passes to the piston-cylinder through the ordinary slide-valves. ln this case A are .situated two cylinders, B and C, which form the valve proper, the outer one heilig stationary and having a steam -cham ber,

c, around it, and the inner-oneturning with a shaft, D, and tittin g closely within the outer. Both cylinders are provided with ports through which the steam enters, six b eing'represented in each in the drawings, and these' are so rela- .tively arranged that'those of Atheinner cylinder pass those of the outer at each direeta'nd reverse stroke, whether said stroke is long or short. i

The regulation ofthe flow of steam is accomplished not vby the length of stroke or extent 0f movement of the inner cylinder, but by the quickness or slowness of the stroke, whereby the ports are a less or a greater time in passing each other.

The shaft D extends through both ends of the ease, being adjusted, if desired, at the near extremity' by means of a serew-thread-and nut,

while with the opposite extremity is connected the variable apparatus by which the valve is operated. Tothe end of the shaft is rigidly secured a crank, E, of` suitable length, having at its bottom a pivot-jointr-which connects with a `rock-lever, G, actuated by means of a rod, H, at the opposite end, that receives motion from the' eccentric of the engine.y This rock-lever is 'provided with a slot, f, or equivalentg'ot' suitable len gthin which adjusts up and down a fulcrums1ide,g, connected with and turning freely on a wrist, h, Fig. 6, connecting in a similar manner with a sliding block, I. This slide g forms the fulcrum on which the-reels lever Gr. turns, and as the upper and lower arms are lengthened or shortened it is apparent the motion of the shaft D and valve-cylinder C are correspondingly retarded oraecelerated. Th us when the upper arm of the lever or that above' the fnlcrum g is the shortest (by reason ofthe rising of the fulcrum in the slotj) the motion of the cylinder C is the greatest, produced by the same length, and, consequently, the passage of the ports pass each other the quickest, so as to allow a shorter time for the passage of the steam; but when the lower arm ofthe 'lever is the shortest(by reason of the fall of the fulcrum) the' motion of the cylinder isthe slowest, so as to give the greater time for the passage of the steam.-

This arrangement is Very simple and not -liable to get ont of order, andV is very effective in eeeomplishing theoljjeet for which it lis d@ signed.V The valve is nearly balanced vby the pressure of the steam all around it, and therefore but very little Aforee is necessary inopereting it.- By regulating tlie 110W of the steam by a. variation in the motion of the Valve instead of by opening ai greater or less space of the ports simply the action is much morer regula.1,tl1ere is less'jer and. strain to the ma.- ehinery,y and' a. great saving in the expense of running zin engine.-

- What We claim ns this invention, and desire t0 secure by Letters Patent. is

The sliding block I, the fulernm g, and the rock-lever G, or their equivalent devices, in combination with a steam-valve and governor. A. D. GROMBIE,

J. M. D. GREENE, LUCY COLBORN, Assignees. Witnesses as to signature of A. D.Crombe G. LOGKWOOD, JNO. R. ERGOOD. Witnesses as to signature of J. M. D. Greene:

J. P. VARIAN, P. T. WTHEROY. Vitnesses. as to signature of Lucy Golborn:

, J F; WEISHAMPEL, Jr.,

MILES G. SHOREY.

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