US48418A - Improvement in the valve-gear of steam-engines - Google Patents

Description

Y UNITED STATES PATENT OFEIcE.

.d JAMES MALOY, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN THE VALVE-GEAR OF STEAM-ENGINES.

Specification forming part of Letters Patent No. 48,418, dated June 527, 1865; antedated June 9, 1865.

To all whom it may concern:

Be it known that I, JAMES W. MALOY, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Steam-Engines; and I do hereby declare that the following description, taken in connection with the accompanying plate of drawings, hereinafter referred to, forms a-full and exact specification of the same, wherein I have set forth the nature and principles of my said improvements, by 4which my invention may be distinguished from all others of a similar class, together with such parts as I claim and desire to have secured to me by Letters Patent.

The present invention relates to certain new and useful improvements in steam-engines, having for their object the regulating of the amount of steam supplied to the cylinder, with l `a view to adapting the power furnished to the actual Work to be performed or the load upon the engine.

My improvements are applicable to the Wellknown link-motion, or motion in which the medium of communication between the `valverod and eccentric-rod is by means of a link, the leverage of which can be changed at pleasure, and consequently the play of the sliding valve varied accordingly. This link has hereto- Y fore been operated by several different methods, but principally by means ofthe regulator itself; but in these cases it has been found very dif- `fcult to actuate it successfully, because suflicient power could not be furnished by such means, the force furnished by the regulator or governor, for instance', bein g insufficient to give the link its necessary motion.

My improvement consists in giving the required play or motions to `the link by means of a small auxiliary steam chest and cylinder fitted with a proper valve and piston, respectively, the valve being actuated by means of the vertical play of the regulator-rod.

The accompanying plate of drawings represents my improvements.

Figure l represents a top view of aV stationaryengine. Fig. 2 is a side view of the same. Fig. 3 is a detailed section of the saule, taken in theplane of the line A B, Fig. 2.

a a a in the drawings represent the bedpieoe of a stationary engine. b b is the cylinder; c, the piston-rod; d, the connecting-rod, and e the iiy-wheel.

fis the main steam-chest, in which slides the upon a pivot, Z, thereby increasing-or diminishing the leverage that the eccentric-rod h has upon the valve-rod t in the same manner as heretofore used in other engines 5 but this link 7c, instead of reeeivin g its motion from the regulator-rod m, or from any other moving y part of the engine, is driven by a piston-rod, n, attached .to the link k at the point o. The

piston-rod n travels up and down in a small steam-cylinder,p, which is supplied with steam from a steam-chest, q.

ln the steam-chest q works a valve, r', which opens and closes the ports that communicate with the cylinder p at the proper times. The

- valvep is fastened to the lower end ot' the regulator-rod m. Thus it will be seen that according as the balls of the regulator s s are more or less extended, in accordance with the load upon the engine, the valve p `will admit more or less steam to a the cylinder p, and through the piston-rod a the link k will be more or less raised upon its pivot l, thereby increasing or diminishing the play ot' the sliding valve g, and consequently supplying` the main steam-cylinder b b with a quantity of steam proportionate to the load upon the engine. It will be observed, therefore, that the play of the link 7c to effect this desideratum is entirely performed by means of the auxiliary steam-cylinder and its piston, and that its certainty of operation is insured at all times, instead of being dependent upon the movement of the regulator-rod or other uncertain and inadequate means.

Having thus described my improvements, what I claim as my invention, and desire to have secured to me by Letters Patent, is-

Actuatin g the link that forms the communication between the eccentric-rod and slidingyvalve rod by means of an auxiliary steam cylinder and piston when supplied with steam by the movement of the regulator-rod, as set forth.

J AMES WALE MALOY.

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