US76140A - baldwin - Google Patents

Description

. @with gisten attntffig,

GYRUS W. BALDWIN, OF EOSTON, iiSSlGNGl T() LAFAYETTE HUNTOON, GF MlLlTORD, M.^.SSAGHUSETTS.

Lcterc Patent IVO. 76,14@ dated March 31, 1858.

IMEROVEMEET 1N STEAM-ENGINES.,

TO ALL TO WHOlVl THESE PRESENTS SHALL COME:

De it known that L'CYItUS W. BALDWIN, of Boston, county of Suifolk, and State of Massachusetts, have invented a new and useful lmprovcm'en'trin SteamfEngin'esg; and do hereby declare the following to be a full,

clear, and exact description` thereof, due reference beinghad to 'the drawings, which accompany and make part of this Specification, and in whichf' i l Figure-1 is a plan, l

Figure 2 an end elevation,

Figure 3 a vertical and transverse section of my invention.

`Figures 4: and 5 are sections of the valve-ports, and

Figure 6 a vertical section of the two cam-shafts, to be hereinafter described, while A Figures 7, 8,v and 9 areviews showing the construction of the valves.

This invention` `has rcferencevto or is an improvement upon that class of steam-engines in which two cylinders of dii'erent capacities are employed, the steam from the smaller cylinder boing exhausted into and used expansively in the larger. 4 I Y The object of this invention is to obtain in such class of en gines the advantage of thc well-known puppetvalves, and consists inthe arrangement -with such engines of a'series of such valves, in manner and to produce results substantially as hereinafterexplained.

One advantage, among others, of the above-described arrangement of the valves is, that by being placed at the bottom of or below the bottom of the cylinder or cylinders, the condensed water is allowed to escape' freely and automaticallyfrom such cylinder. The mechanical construction and application, also, ofthe valves is such that they-may be easily got at for inspection or repair, and are applied, in the rst instance, with economy and ease.

` In the above-mentioned drawings, A denotes thesmall cylinder; B, the large cylinder. C is the bed, the valves being-numbered 1, 2, 3, 4,- 5, and 6 respectively. D is the governor-shaft, on which is a small cam, E, which'operates the valves by means of tappets a2 a3 on the arms a al, which carry the levers b', attached to the stems of the valves l, 3,4, and 6. On the-governor-shaft* there is also a large cam, E', which operates the levers c c1, attached to the stems ofthe valves 2 and 5. On the governor-shaft D is also an incline, F, which 'is attached to the spindle G by means of a pin passing through a slot in the governor-shaft, which permits the spindle G and the incline F to bc raised or lowered as the balls shall be dropped or raised byccntrifugal force, the balls being connected with the spindle G. The incline F, being lowered with thc spindle Gr, strikes the bellcrank d, which operates the catches e2 e3, to release the levers e203, and allow thevalves 1 and 6 to drop, as regulated by the governor. vThe governor-shaft is driven by means of a longitudinal shaft, running under the bed C, and connected with the governor-shaft D and main shaft by the proper gears, in such' a manner that the governor-shaft D shall turn at the same speed as the main shaft. The cup puppet-valves are of a new and peculiar construction, which will be readily understood by reference to the accompanying drawings, the operation of which will. be hereinafter described. VThe valves and ports are placed as near as possible to the large cylinder 13. i l

The operation of the above-described arrangements will be readily understood to be with precision, cer` tainty, and case. Y The governor is so adjusted that, when the engine is working under a full load, the steam will bc allowed to follow piston, in small cylinder A, the'full stroke. Steam is iirst admitted from boiler, through the valve 1, to small cylinder A, by means of the ea-m E, which also closes it at the end of the stroke, or as the governor may determine, when valve 2 is opened by the caurE and levers c el, which permits the exhaust from small cylinderA to pass into large cylinder B, where it is expanded in proportionto the diifercncein the capacity of the two .cylinders` `Valve 2 closes at the end kof the stroke, when valve lis again opened by cam E, which 'admits steam at the boiler-pressure into cylinder A. At the same time valve 5 is opened by the camE', allowing thc'cxhaust from cylinder A to pass into cylinder B; and valve 3 is opened by cam E, which exhausts from large cylinder into the open air; lthe small cam, opening the valves 1 and 3, which admit steam from the boiler into small cylinder A, and exhausts from large cylinderl into the open air. At the same time cani E opens valve 5, and allows the exhaust from small cylinder to pass into large cylinder B and be expanded. At the end of the stroke, thc valves l, 3, and 5 close simultaneously, und valves G and l are opened by earn E, which admits steam from the boiler into small cylinder A, and exhausts ein large cylinder B into the open air, and large cum E, at the same time opening valve 2, ulrich exhausts from smell cylinder A into large cylinder B, whereit expands.

This operation of the valves G, 4, and 2 is the saule as that of valves l, 3, and 5, except it is on the return stroke, and on the opposite side of the pistons. If a part oralllot` the load at anytime be taken from the engine, the balls rising, the moment the engine increases its speed, force the spindle Gr, with the incline F, down upon the bell-crank d, which operates the catches c2 e, releasing'the levers e: c3, and the valves l and G, closing and cutting oil` the supply or" steam from the boiler to small cylinder A, shorter or longer, according:r as more or less amount of load is removed from the engine. rlhis, eut-oilhas a range through the whole length of stroke, and, in ease of necessity, will cut oil' the supply of steam` from the boiler entirely. The instant closinglr of the valve is secured by use of the springs e c e e e e.

The construction ofthe valves, as shown in figs. 7, 8, and 9 of the drawings, is very simple, and their action is with certainty and ease. It requires but one scat, which prevents any leakage by unequal expansion. The opening being on the side of the frustum of a cone or pyramid, causes the principal pressure to be inward and downward only, in the amount proportioned to the incline of the seat, which is Aonly sufficient to prevent the.

valve from sticking. Any weer in thevalve or seat rfill only cause them to it more closely, if possible. v It cannot cause leakage. The moment-the valve rises, steam rushes into the port7 both under and through the top of the valve7 thus allowing ample and unobstructed passage for the steam. The closing of the valves is certain, without the use of other guides than the usualstulhng-box around the stein, the valve and-seat themselves forming a sure guide.

I claim the arrangement of puppet-valves, with reference to that class of steam-engines in which two cyl.

inders of different capacities, and exhausting from one to the other, are employed, substantially as herein vshown and described. v

I claim the arrangementof the valves, their casings, and the steam-passages, in rela-tion to each other, and

operating essentially as before explained.

C. W.'BALDWIN.

`Witnesses :v

FREDERICK CURTIS, E. C. GRIFFITH.

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