USRE7813E - Improvement in valves and gear for direct-acting engines - Google Patents

Description

ZSheets-Sheet 1.

G. F. BLAKE.

` Assignor to G. F. Blake Manufacturing Company. VALVES AND GEAR. FOR DIRECT-ACTING ENGINES".`l` No. 7,813.

Ressued July 24, 1877.

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VALVES AND GEAR Eon DIRECT-ACTING ENGINES. No..7,813. Y Reissuea July 24,1877.

'Wh Est-:1:5 i v Trlveqinr UNITED STATES PATENT OFFICE.

GEORGE E. BLAKE, 0B BOSTON, MASSACHUSETTS, ASSIGNOB To eEoncfE E. BLAKE MAEUEAGTUBING COMPANY.

I MPRoveMENT m vArvEsiANn GEAR .FoRongecT-Acrme ENemEs.

Specification forming part of Letters Patent No. 60,852, dated January 1, 1867 Reissue No. 1,813, dated J uly 24, 1877 application filed June 13, 1877.

To all 4whom it may concern.' them. F is a tappet-rod, which extends from Be it known that 1, GEORGE F. BLAKE, of one to the other cylinder, as shown in Fig. 2, the city of Boston, in the State of Massachuit being adapted to.,.,move freely, but steamsetts, have invented certain new and useful tight, through the s' {lifting-boxes d diu obe- Improvements in Steam-Pumps; and 1 do dience to impulses received alternately and at hereby declare the following to be a full and intervals from 'the pistons B and D. correct description of the same, reference he Attached by slotted joint to the tappeting had to the accompanying drawings, in" rod is aswinging lever, G, which is pivoted at whichy g to the standard I.

Figure 1 is a longitudinal vertical central To this lever is also pivoted, through a slot section of the engine and pump looking toat f, the valve-rod H, which passes into the ward the `left side. Fig. 2 is a similar section steam-chest J l through the stuffing-box h. K looking toward the right -side. Fig. 3 is -a marks the main inletport,and L the main horizontal section on the line ux u* of Figs. exlvxaustoutlet. M is the small slide-valve, huidig. vFig. .4 is a Itransverse .vertical secand N the main valve, -whicllis carriedabyhe 'online n tot' Figs; Ii'iil'. -s'a "aixiiiarycylindrieal piston() in the auzciliary"A similar section on line w w o'f said figures. cylinder Pf. Eig. 6 is a similar section-on line n: of the The valve M is a atslide-valve of the orsame. Fig. 7 is a similar sectioncn line y y dinary kind, having two cups, i Ii, and it conof the same. Fig. 8 is a similar section on trols the ports which supply and exhaust the line z z of the same. Fig. 9 is a. perspective auxiliary cylinder P, and also the additional view of the auxiliary piston of the 'upper cylexhaust-ports of the main cylinder. iuder, and Fig. 10 is a similar view of the The main valve N, (See Figs. 1, 2, and 10,) vah'e which is operated by said piston. made as a segment of a cylinder, controls the One portion yof thisl invention consists in supply and exhaust ports-of the main cylinthe combination, `with the main valve, the der, and also, in conjunction with-1 valve M, auxiliary piston, and the main ports, of the acts as a cut-olf, as will be hereinafter exanxiliary valve, the ports covered by it, and plained. the ports k and t, which serve-the purpose of 4 'lhe plain Surfaces of the main valve are exhaust-ports for the main cylinder, as her-eshown as projecting at each end sornc distance inafter set forth. beyond the cups a and b. 'By supplying the main cylinder promptly The auxiliary piston O (see Fig. 9) is a j with steam when its piston nears the end of hollow cylinder, `solid at each end, open at its stroke, and by the peculiar method of center, and provided with slots d in its sides cutting oil.l the pounding of such piston to receive a pin, e', which allows it to recipro' :against the cylinder-head, which is so'comcate in the auxiliary cylinder P, but prevents mon and injurious in steam-pumping engines, it-fron1 turning on its axis. v'is prevented. 1 ThevalveNisreceivedintotheloweropening The invention also has reference to the comof the piston l?, and moves with it.- biuation of the auxiliary piston and main The connectioibetweeu the main valve N valve, as hereinafter described, so that they and the auxiliary piston is such that the valve may be moved over a d be supported upon is free to move radially with relation' to the the same curved surface. v axis of the auxiliaryv piston, .to keep its face kTo enable others to make andnse my imagainst the valve-scat, and so as to move prov/ed steam-pump, I will proceed to delongitudinally with the piston during its'rescribe its construetionand operation, referciprocations y ring to the drawings. r Steam-passages c of allow the free circula A designates the purnp-cyliuder; E, the vtion of steamraroundfthe auxiliarytpiston bc steam-cylinder; B, the pump-piston; D,`tl1el tween its ends, and thus equalizes the press` steam-pistomand Othe piston-.rodcounecting figue on theyalve N, and lessons its tendency y through port p, and outlet to wear. These grooves c c'g also enable the valve-seat to be so separated from the interior surface of the-cylinder that the valve may, in its reciprocation, wipe itself on the walls of such grooves. A

The steanrports are marked` j k l m u p q r s t u. Of these,j leads from'the steam-chest to the rear end of the auxiliaryl cylinder 1. k is the exhaust for the auxiliary cylinder P, and the additional exhaust for the main cylinder, communicating, as seen in Fig. 3, with passage R, leading to exhaust-outlet L. The port lcounects the steam-chest with the steamway n', leading to the rear end ofjthe main cylinder, and serves to connect that steamway with the auxiliary exhaust k. The port 'm is the supply-port for the rear end of cylinder E. The port n is alternately the supply and exhaust of the same en d of that cylinder.

The .port p is the, common exhaust'for both ends of the main cylinder, and communicates 4directly Awith the steambutlet L.

The course of the steamis as follows: When the valvel Mv is in the position show'n in Fig. 3, steam passes through port m, under valve N, through port n, and passage n", into the vrearward end of cylinder E, driving the piston D toward the forwardLend of the cylinder. At the same time the exhaust takes'place through passage q', port q, under 'valve N,

The additional exhaust'also. takes placesimultaneously through port s, under valve M,

and through port tinto steamway R, and out at main outlet L, thus facilitating the r'apid discharge of steam from the end ot'- themainv cylinder toward which the pistou is moving.

When piston D is moved'forward farenough to strike the tappet-rod F, then port j is 'uucovered by valve M, and :the en dof the auxiliary cylinder P takes steamthrough passage i', and under the spring-yalve v2, itthen opening under the pressure of the steam. The auxili- 'ary piston O is driven forward, and-at thevopi' posite end the steam `is exhausted through ports uy and t, which are connected `by'valve M. 'The forward end of themain cylinder then takes steam through porter-,(1, and q', which are connected by the main valve N, port r beingthen'uucovered by valve -M for the passage of steam `from the steam-chest.

The mainexhaustof the `main cylinder takes place through ports 'r1/and p, connected by valve N,aud theadditional exhaust of the same end' is through ports l and k, connected by valve M.

-When the ports u audj are net covered by the auxiliary pistou, thespring-valve o1 and o. are closed, as the pressure is the same on both sides; consequently, when the auxiliary piston approaches either end of its cylinder, a certain amountof4 steam is entrapped between the end of the piston and head after it has 'covered the exlianst'port u or j', forming' an elastic cushion. l

The main valve 'N not only serves to regulate the supply and exhanst'ot' the maincylinder in the ordinary way, but cozoperates with valve M in forming aout-off. The valve being prolonged at the ends beyond the cups' a. b', those prolongations serve, at a proper period of the stroke, as a cutoff, by preventing the flow ot' steam through the spplyfports m and r,fa lternately, to the ends oirthe' main cylinder, with which those ports respectively connect. l I "'he drawings, this valve is shown as t cutting the upper-end ot port r,.wh1le l the lower end of the same port is closed by valve M. Thus, beforethe piston gets to the end of its stroke, the supply of steam behindv it is-cut off, and that end ,of the cylinder put in communication with the auxiliary and mainl exhaust-ports.

In this way theobjectionable pounding i-l the piston against the end of the cylinder vis to surround the main pston-rod, and arranged to move thereon' without appacking b elween them lto prevent the passage of steam from` one tothe other cylinder.

`Having thus fully described my invention,

what I claim, and desire 'to secure by Letters Patent, isil 1. 'In a steam-pump provided with two pistous connected by a piston-rod sustained in stnngboxes in the cylinder-heads the combination with the main piston-rod,'ot' an independent tappet-rod parallel with but removed from contact with the main piston-rod,v and connections substantially as described between such tappet-rod and the" auxiliary valves to operate as set forth.

2.-'lhe llever G, pivoted at g, in combination with the tappet-rod, and the rod H, con--v nectedf with and to operate the double 'auxiliary valve during the movement of, and inthe vdirection of the movement of, the steam-pis tou, snbstantially'as set forth.

3. In combinatiomthe main valve, the-aux iliary piston, the main ports, the auxiliary valve, the ports covered by it,and the' ports k and t, which serve the purpose of exhaust# ports for the main cylinder, the combination being and operating substantially as described,

4. The auxiliary piston and the Asegmental main valve connec edloosely therewith, in

combination with t 1e auxiliary cylinder and mais, I 'a its segmental or curved seat, adapted to sustain both the auxiliary piston and the main valve on the same curved surface, substantially as described. f

5. In a steam-pump, a. single segmental or curved valve-seat, extendec'li from end to end of the auxiliary cylinder, and provided with ports r q p m n, in combination with the main valve audits loosely-connected auxiliary piston, both adapted to rest upon and be reciprocated over and in contact with the same curved seat, substantially as set forth.

6. The combination,l with an auxiliary valve and its seat, provided with ports leading to the auxiliary cylinder, of the main valve'and main cylinder, whereby a single valve serves to operate the main valve to r'ut off steam from the main cylinder, and as an additional exhaust from said cylinder.

GEO. F. BLAKE;

Witnesses:

G. W. GREGORY, W. J. PRATT.

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