USRE2060E - Improvement in steam-engines - Google Patents

Description

UNITED STATES PATENT .'OFFICE.

EnwAnn' n. Bauamt AND H. B, BIGELoW, or NEW HAvE N,coNNEcfri.

our, Assicnnns 0F E; D. BARRETT.

IMPROVEMENT IN STEAM-ENGINES.

Speciiication formingpartot Letters Patent No. 19,119,`dated January 19, 185B.; Reissue No. 2,060, dated August '29, 1865.

T0 alZ whom, it may concern:

\ l-le it known that I, EDWD. D. BARRETT, (formerly ot' Cincinnati, Ohio,) of New Haven, in the county of New llaven and State of Connecticut, have invented a new and useful 1m-r provement in Steam-Engines; and [do hereby declare the following to be a full, clear, and exact description ot' the same, when taken in connection with the accompanying drawings'v and the letters of reference marked thereon, and which said drawings constitute part of this specilica-tion, and represent, ill- 1 Figure l, an axial section through the. cylinder and valve-chambers, and in Fig. 2 the auxiliary port and valve enlarged.

Similar letters indicate corresponding parts. l

My invention is designed to operate the valve of steam-cylinder, to reverse the piston, and avoid the necessary use of a crank or its equivalent.; and my invention consists in the arrangement of two connected pistons vwithin a cylinder auxiliary to the principal cylinder to operate the valve ofthe principal cylinder, and so constructed and combinedwith the steam-passages of the auxiliary cylinder as to close the exhaust-ports ofthe auxiliary cylinder after the ports of the principal cylinder are opened, to admit steam to the said principal cylinder, by which closing ofthe exhaustports of the auxiliary cylinder the pistons of the auxiliary cylinder cushion upon steam at either end ofthe said auxiliary cylinder; secondly, in an arrangement ot' valves and passages in the cylinder of steam-engines for cushioning the piston and aiding in reversing its stroke.

*y Toenable others skilled in the art to construct and operate my invention, lwill proceed to fully describe the same, as illustrated in the accompanying drawings.

A is a steam-cylinder having piston P, slidevalve B, exhaust-passage U, and side passages, 1) and D', all of ordinary construction, except that the passages D and D open into the cylinder at a less than the length of the piston from the cylinder-heads instead of at 'the extremities ofthe cylinder, asin ordinary steamengines.

'E and E are two auxiliary passages, opening into the cylinder at its extremities, for the purpose of conducting steam into the cylinder at certain periods of they stroke, steam entering the said passages E and E' from the pas- 4 sages l) D through the ports e e.

l is a rocker arm operated by a tappet, G, on the piston-rod lt.

a is an auxiliary cylinder attached to and forming a steam-chest to the. principal cylinder A. 1

p p are two pistons connected by a rod, i",

and the said rod r attached to the valve B ot' lthe principal cylinder Af d d are steam-passages to the auxiliary cylinder, likethe passages D D of the main cylinder, opening into the auxiliary cylinder at the same relative distance from the heads ot' the auxiliary'cylinder.

vf f are two .-passa'ges, auxiliary to the passages d d,opening into the auxiliary cylinder at its extremities, for the purpose ot' conducting steam into the auxiliary cylinder at eertain periods of-the stroke of the pistons p p, steam entering the said passages fj' through orts t' i in like manne-r as -in the main c linder.

a. B' may be connected, as denoted by the brok n red lines, so as to receive vsteam from one and the same pipe, or separate pipes may he employed to conduct the steam to each steamchest.

T is the valve-rod, connecting with .the

rocker-arm F and the slide-valve b of the auxiliary cylinder.

The valves which close the portse e it' are constructed as follows, (shown. enlarged in Fig. 2:) I is a cup-shaped valve, fitting the said ports,having acap, J,`pierced by a stem K, which is retained within thecnp by a foot,

L. The stem K is screw-threaded,so as to ht a corres pendingV thread below the stuflng-box M. The stem K, extending up through the said stuing-box, terminates in a handle, O, by means of which the stem may be turned up or down, to govern the operation of the valve I, to hold the said valve permanently open, re-

U tlie exhaust-passage for the' auxiliary cylinder, which may or may not connect with s The steam .thus admitted-forccs exhaust-passage 'and for the same purpose as ""valveB-permits the steam P51' cylinder to escapethrougb psssage,

tinning to act. ing thelvalve cylinder will continue tctraversc from end to s end of its cylinder,l preventing the piston of strict its opening, or permancntlyclbse it, at the pleasure of the, engineer. Stea.m,being4 admitted to the steam-chests,enters the steamchest a and lills the space .between the two pistons p p and holds them in equilibrium.

The tappet rock-er arm F, slide-valve b, and pistoni 'P are arranged relatively to each other and to the steam and exhaust passages" of the auxiliary cylinder so lthat the instant the main piston P has passed (for example) the side passage D atthe (then) exhaust end of the cylinder the slide-velvet will be drawnback by the rocker-arm to the position indicated in Figi 1, (the pistons p p and valve B being at theirextreme position, as denoted in red,)which will admit steam through the pas sage d, thence lthrough the p ort and passage f to thecylinder before the piston p, forcing the connected pistons p p with the valve B quickly to the opposite end of the cylinder; lThe p'iston p,closingthe exhanstpassaged,re tains sufficient quantity of steam at' that end of the cylinder. to cushion against andprevent thepiston from striking the cylinder-head. By this movement of the pistons p p', carrying 'with them the valve B, opensthe side passage, D, through lwhich steam lpasses tothe princi-- Y pal cylinder through the port e and passage E in front ofthe piston P, as denoted by arrows. the piston P 'tothe other end of the cylinder until the (now) D'is closed'by. the piston P, as denoted lin red. The steam Ythen remaining in Athe-cylinder between the piston and cylinder-head forms a cushion in like manner described for the pistons inthe auxiliary cylinder. l In the last y part of thet travel of the piston P the tappet G turns l y valve b to reverse lthe auxiliary vpiston to exthe rockerarm, to throw the small haust the steam from Tthe auxiliary cylinder when the pistons p p, carrying with them the valve B,` will return to the position denoted in red, cushioning at that end in like man-ner as .before `described, which .movement of 'the within the yprinci-` thc exhaustandmore steam to he admittedto the cylinder'uponlthe opposite side ofthe piston causingthesaid pistonP to return 'toithe Fig.- 1,l cushioning at, that pos'tion denoted in Zend 'of the cylinder in like manner as described at the'othe'r end of the cylinder', and so con- The auxiliary'pistens operat-l B, theipiston P iulthe principal ranged substantially Yst ibai-,an'ti'ally as specified.

which they are cushioned.y The cushion may aid in reversing the pistons, but. such aid is not necessary to the successful working of my invention. y The rocker-is so'coustructed that alter the. arm 'F has been suliiciently turned llo openf/ the valve b the tappet G will' complete init, movement with the piston Pwithout further' Y movement of the rocker.v Asthe surfaces of the lrocker abovcthe tappet and thegu'ide below are'parallel, therefore by changing'the form offthe' rocker or. making it adjustable the valve b may be opened at any required point in-the movement of the piston P, and so as to i open more or less the ports of the auxiliar-y cylinder.

dead-points,andbynopossibilitytobestoppcd except by cutting..oif the steam entirelyv or.'

accidental derangement of some of the parts,

lwherebyit is made peculiarly applicable to all pui-poses where a simple reciprocating movement only is requir A :Having therefore thus fully describedmy invention, what I claim as new and useful and desire to secure by 'Letters'Patent ig...

'1' Impaltllg t0 the valve of the auxiliaryfj" l"folllel apositive movement from the piston `0f the principal cylinder by means of the tappet G and rocker, F, for the4 mitting and exhausting steam purpose of ad to actuatethe pistons of theauxiliary cylinder, when the said pistons are constructed of equal areas and arv as described, and the` steam .which act'uates them received 4direct from the boiler for the purpose of operating .the valve or valves of the principal cylinder, substantially as and for the purpose set forth herein. f 1' l 2. The .pistons P .and P', constructed and arranged relatively'to the passages d d' operate in the manner'-- and for the purpose s..

, 3.' The arrau gement ofthe check-valve I -I'f and passages E E', in .relation-to the.passagesV D and D'. and the main valve, substantially@ -RUFU's SANFORD.

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