US66156A - lodmis - Google Patents

Description

\ 2 Sheets-Sheet 1.

K. H. LOOMIS. VALVE FOR STEAM ENGINES.

No. 66,156. Patented June 25.1867.

sheetssheet 2. K. H.LooM1s.. VALVE FOR STEAM ENGINES. N6. 66,166. Patented June 26, 1667.

'v AjN ERUNT, 0F FISHK'ILL, NEW YORK.

` Laim Patent ne. 66,1356, ma June 25, 1867.

IIII*PEINEIIIENT.IN VALVES 0E STEAM ENGINES,

Y Sfctttule referrer tu in tteseettet gatent mit mating pnt nf tte sume.

one,

To ALL wEoM ITQMAr-CCNCERN:

Y Be it known 'that I, KELLOGG I-I. LOOMIS, of Cincinnati, in the county of l-ulamilton, and State of Ohio, have invented certain'new and useful improvements in Steam Engines; and I do hereby declare the following to be a full, clear, and ex'act description of the construction and operation of the saine,.reference being hadtothe accompanying drawings, making a part of this specification, in which- Figure 1 represents 'a side elevation. I Figures?, 3, 4, and represent, on an enlarged scale and in different positions, the earns for operating the valves. l i Figure 6 represents e vertical transverse section through the cylinder and valves and accompanying parts. Figure 7 represents s. longitudinal verticalsectionthrough thecylinder, valves, and the adjacent parts; and 'Figures 8., 9, 10, and 11 represent, on an enlarged scale, the conical plug-valves and their openings. Sirn'ilar letters of reference, where they occur in the several separate figures, denote like parts of the engine in allf the drawins. l

Myinvention consists, rst, in the construction, and incidental thereto, the operation of'the steain valves;

and secondly, my invention consists in the construction and operation ofthe cams on the .governor-shaft, and

the appliances connected thereto, for operating the steam-valves.

' To enable others skilled inthe artto make and use my invention, I will proceed to describe the same with reference to the drawings.

A represents, the frame or stand on which the engine rests. The steam-valves are arranged above and below the steam-cylinder, and in the line of their lengths at right angles relatively to each other, so that a' section taken through the valves and cylinder will be a crossss'fection of one and a longitudinal section of the other. My valves are what I term conical plug-valves, as seen more distinctly in figs. 6, 8, and 10. They are'` constructed as' follows: The ease o1' seat B, iri which the inner part C of the valve turns, is stationary, but made separate from the frame in which it is set, so that the openings through it may be more regularly and accurately madethan it could be in the frame from the inaccessibility of the necessary tools to dress them out,l

and so that also `they may he taken out and replaced by others should they become worn, or from any cause get out of order. The steam openings a, through the seat B, do not extend from `end to end thereof, there being a portion, in the liuc of these openings, which remains to give the seu-t suilicient strength and prevent,

springing or yielding', as would ybe the case if cut clean through.

Within the case or scat B'is the valve proper, C, made conical so as to snugly t and readily turn inside of the scat. The valve or plug C is also furnished with a series of openings, c, out through its perimeter, which correspond irl-shape and position with those, a, cut through the seat, and the plug or inner part C of the valve has a hub, d, inside of it, and a part of it ofthe general form shown in figs. 6 and 10, that is, of suflicieut length at its centre to make a firm fastening and support on the valve-rod D that turns it, and cutaway where it joins the interior of the plug, as seen at e, so as not to contract or interfere with the steam openings c. A portion also-of the plug fis left uncut, so that it will not spring or yield at its central portion, which it would do to an injurious extent if'the Aopenings ex ten ded throughout its length as in ordinary cases, except a ring et the ends. There are set-screws g and jam-nuts z vat each end of the valve-rod D, so that the plug C maybe tightened or loosened in its seat when necessary.

The valves are operated as follows: Motion froinfthe engine is imparted to the shaft E in any of the usual ways. This shaft E is horizontal, and has upon its end a bevelgear, F,'that takes into a similar gear, G, on the governor-shaft or rod H, and through this gearing the governor-shaft is revolved. Upon the lower endl of thc governor-shaft or rod there s secured a cam, II, which, as it turns with said rod, operates alternately the rods J J, said rods passing through cylinders or boxes K K in which springs (or an air-cushion) may be arranged to return said rods after they have been moved by the cani, or, in other words, to keep said'rods up to the can. The rods J J, after passing through the cylinders K, connect with an arm, respectively, t', ou the valve-rods D, and thus oseillate said rods and the valves or plugs C upon them, The openings a c through the seat and plug, it will be perceived, are rounded off or increased in arca. both where the steam ent-ers and leaves them. This is done to allow the steam to enter and leave said openings without impediment, as is the case .--w'here the openings are uniform in arca throughout. The escape-valves below the steam cylinder are worked with a uniform extent of rotation, varying, of course, in the time or speed of the rotation with the motion of 'thc governor-shaft. It is not so, however, with the inlet-valves, as they act as inlet and cut-ofi` valves both, so that their extent of rotation, as well as their speed, must be varied asv the speed of the engine varies.

The inlet-valves, though constructed like the escape-valves, are operated as `follows: Upon the governorxod H, nearly at the line between the inlet-valves or chests, is arranged a cam, L, which is both conical and spiral, andwhich, as it is raised up by the action of the governor-balls in the usual way, is constantly presenting a diil'ercnt and shorter beat or throw to the pistons orlrods J'J' that operate the'inlct-valves, and causing them to open the steam ways fora correspondingly shorter and shorter period; and when this cam is lowering, by the motion of the governor-balls, an increasedbeat or throw is presented to the rods J' J', which .hold open for an increased period of'time the steam openings in the valves.

The rods,J' J' like those worked by the under cam,pass through'cylinders or boxes K' K', wherein are springs, or an air-cushion, for returning or holding said rods against the cam L, and this cani is arranged within u ring that forms a support for the governor-shaft' and the cylinders K' K'. The cam L revolves within the ring M, and should the governor from any cause raise the cam so high as to be above and not touch the rods J', the consequence would be that tlievalves would remain closed, and no injury could happen to the' engine.

The steam passages N, to and' from the cylinder O, are of the usual form and construction, P being the inlet steam pipe, and Q the escape pipe. The steam valves being close to the steam cylinder, and operated by the governor, without the intervention of any other valves, the change of speed of the governor is `instantly imparted to thc piston, as the steam has such a short distance to go after passing the valve,

Having thus fully described my invention, what I claim therein as new, and desire to secure by Letters Patent, is

1. The case or seat B constructed as described, and arranged within a conical opening in its ,f1-ame, and provided with a tapering plug-valve, C, said valve being provided with a' transverse 'huh atits centre', and with longitudinal slots on each side of said hub, the steam openings being uniform .at their intersection, but made flaring from this point outwards and inwards as specified, thc whole being arranged as and for the purposes set forth.

l 2. The arrangement of the conical spiral cams L and I upon the vertical governor-shaft in combination with the tapering plug-valves J' J', foi-regulating the flow of steam to and from the cylinders, in the manner herein-specified.4

3. 'lhe valve-scat B, with central supports b Z1 bearing upon the cones/f f, when -arranged in combination with thc valve C, in the manner and for the purposes specified.

' KELLOGG' H. LOOMIS.

Witnesses:

A. B. SToUoH'roN, EDM. F. BROWN.

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