US102367A - William brown - Google Patents

Description

diluted l# ita-tra @anni ken, in the county of Hudson and .State of New Jerv Valves and Valve- Gear for Steam-Engines; and I do pipe is connected. These ports are the cut0ii` or regf 'WILLIAM RoWN, or

Letters Patent No. 102,3

o is o K n N, N'E'W J Annen Y.

67, dated April 26, v1870.

VARIABLE CUT-OFF VALVE-GEAR AND VALVE. I

The Schedule referred to in these Letters Patent anamaking part of the same I arranged back to back', and hav To all whom yit 'may concern:

Be it known `that I, WILLIAM Bnowx, of Hobosey, have invented a new and useful Improvement in hereby declare that the following is a full, clear, and exact description of the same, reference heilig had to the accompanying drawings forming part of this specification.

This invention consistsy principally in a novel construction of the slide-valve or valves of a steam-engine, a novel construction of the valve-seat, a novel arrangement of the steam-passages, and a novel mode of operating theA valve or valves, whereby a separate regulating-valve for regulating the speed of the engine is dispensed with, and the same valve or valves which eiectthe induction, and the educt-ion also, if desired, of the steam, serve also as a regulating-valve to regulate the speed of the engine under the control of a governor.

rJhe invention is capable of some modifications, but I haverepresented in the drawing an example .of its simplest form, in which the induction 'and eduction of the steam and the regulation of the speed are effected by a single valve. y

Figure l is a plan of the Ina-in shaft, the governor, the steam-chest, theA valve, and the valve-operating.; mechanism of a horizontal engine, the valvev and'v steam-chest being shown in section.

Figure 2 is a longitudinal vertical section 'of the steam-chest.

Figure 3 is a face view of the valve.

Figure 4 is a transverse section of the steam-chest and valve.

Figure 5 is an elevation of the governor and the mechanism connecting it with the valve-stem, the' Astem being shown in transverse section.

Similar letters of reference indicate corresponding parts in the several figures.

A is the steam-chest, of cylindrical form, bored out truly from the valve-seat, and having ports, a, a','and b, like those commonly provided for what is known as the three-port slide-valve, the two ports (t a communicating with the opposite ends of the steam-cylinder of the engine, and the intermediate portbcommunicating with the exhaust-pipe. It-is provided, also, with two opposite ports, c c', for the admission of steam thereinto from a hollow belt, d, with which the steamulating ports, and their greatest length is parallel with the length of the steam-chest and with the ordinary sliding movement ofthe valve, by which the induction and eduction ofthe steam to and from the cylinder are effected.

ing their faces turned lto tit its seat in the cylindrical interiorof 'the steamchest.

The face of the segment B, which constitutes thev `v .valve proper foret'ecting the induction andcduction of the steam, is (except that it is cylindrical) like that of au ordinary three-port slide-valveand has those portions ofzits face at the side of the cavitya, cornmonly 'provided for the eduction of the steam from the ports a a to that, 11, inl the steam-chest,'somewhat wider than usual, to. provide for it-s action hereinafter described on the ports c c.

The segment G has its face perfectly 'pla-in, every portion of it fitting to the cylindrical interior of the steam-chest. The portion m of the valve-stem E which is received within the valve, and to which the latter isl secured by screw-nuts f g ou the said stem, is square in its transverse section and taperor wedge-shaped longitudinally, andthis portion of they stem'is, by the adjustment of the saidv nuts, made to set out the two segments B C against the interior of the steam-chest, whereby they fit steam-tight therein, thus compensating for the wear of the valve and boreof the chest.

,The ports c c' 'are so arranged, one at the side of the ports a a b and the other opposite Ato it, that the valve,` by a motion on its axis, is made. to close or contract the opening of both of them, and thus cut oi ordi minish the supply of steam from the passage in the hollow belt d to the interior of the stean'1cl1est-, the

centric on the. said shaft for operating the valve to produce the induction and eduction oi' the steamto and from the cylinder of the engine, the` said eccentric connecting vwith the valve-stem by a rod, H, and the operation of the valve produced hy it rbeing like that ot' an ordinary three-port valve.

I is the governor, having its slide h connected by a lever, J,'aud rod, K, with a lever, L, which is arranged upon a square or feathered portion, i, of the valvestein, radially thereto, and which is also itted into a stationary iillcrum-post, M, in such manner as tol be capable of oscillating, but notot moving in the dircc tion ofthe length ot' the valve-stem.

lhe square portion i ofthe stem is capable of sliding through the said lever L in the ordinary movement of the valve, before referred to as produced by tliee'ccentric.

The rise and fall o variations inthe velocity' ot' thecngine, are made to'so B C is the valve, madev in two pieces or segments,

act upon the lever L as to turn the valve in its seat in,

f the governor-slide, produced by.

the steam-chest, in one or the other direction, transvers to the movement by'which it effects the induction and eduction of the steam.

When the engine vis running steadily at its Anormal speed, the valve is turned to and held in such a position as to leave the side ports c c' as near as may be necessary uncovered by the valve, but, as soon as any tendency to :Ln-increased velocity of the engine is developed, the rise of the governor-slide h raises the t lever L, and so turns the valve to a position' to close or contract the openings ofthe side ports cc, and thusv made by a sleeve, j, in which the said stem is capable of turning freely, but to which it isconfined longitudinally by screw-nuts It k.

It will readily be understood by those conversant with steam-engines that the invention may be modied to adapt it to two short slide-valves, applied one to each of the cylinder-ports, either in the saine or in separate steam-chests; also, that it may be modified to adapt it to slide-valves which are only inductionvalves in engines in which separate eduction-valves are used. i

The invention might also be adapted to dat valves, for which a transverse motion, corresponding with the oscillating motion of the valve represented, is provided. Y It may also be adapted to any ordinary valve without a back-piece, l), in which case one port c only is required for the valve to produce its regulating action.

I do not claim'the dispensing with a separate valve for regulating the speed of the engine; but

W'hat I claim as my invention, and desire to secure by Letters Patent, is-

l. The combination of the one or more side ports c c iu the valve-seat, and the valve having a longitudinal and an oscillating or transverse motion, substantially as and for the purpose herein described.

2. rIhe combination ofthe two segments B O of the valve with `the taper interposed portionm of the valvestem, substantially as and for the purpose herein described.

3. The combination ofthe loose sleeve-connection j ofthe eccentric with the valve-stem and the lever L, connecting the said stem, by thesqnare or feathered portion i, withthe governor,substantially as and for the purpose hcrein specified. i

' WILLIAM BROWN.

Witnesses:

FRED. HAYNns, M. J. SHANLY.

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