USRE3440E - Improvement in steam-enguke exhaust-valves - Google Patents

Description

@dial-1rd gland tslwt @Dllllm THOMAS S. DAVIS, GF JERSEY CITY, NEW JERSEY.

Lette/rs .Patent No. 85,289, dated December 29, 1868; cnt-@dated December 23, 1868; reissue No. 3,440, dated llay 18, 1869.

The Schedule .referred to in these Letters Patent and niialnirxgV Part 0f the 5am' To all persons to whom these presents shall come:

it known'that l, THOMAS S. Davis, of -Jersey City, in the county oi Hudson, and State of New Jen soy, have invented a new and improved ittachment to or Construction of the Exhaust-Passages to Engines; and that the lfollowing description, .taken in connection with the'accompanyingI drawings, forming a. paxtof this specification, gives a full and complete explanation of the nature and principles of my said-v improvemeut, by which my invention may be distin guished from all others, with details of what I consider the best means of carrying outthe same in practice.

Figure 3, a vertical section, taken in the plane ci'- thc .line z x,.g. 1.

A, in the drawings, represents an exhaustfpassage 01* tube. n

This tube A, at its lower end, `is provided with two openings or ports, one alongside ofthe other, to which` pipes or tubes, shown in red lines in the drawings,

to be attached, for forming a connection between the passage Aand the exhaust-ports of the steam or piston-cylinder to an engine.

The upper end, A, of the tube A1 when placed in position upon a locomotive-engine, is arrangedthereon so as to open into the smoke-chamber ofthe same,

and thus allow the exhaust-steam, passing through.

the said tubefrom the cylinder, to lescape into the said chamber. p A

B is a light self-acting valve, of brass or other suitable material, opening freely outward, as represented.

E is a suitablcseat for it to rest and t tightly upon.

Abovesuoh seat is fixed a cross-bar, F, having a hole, as represented, for a. stem, c, of the valve to play through, and thus to guide and steady it in its upward motion from or downward motion to its scat El The means of guiding or steadyiug may be faried at will.

This valve B, when resting ou its seat E,vtightly closes the said passage A to the inward passage from the smoke-chamber', of any smoke, cnders, coal-dust,

heat-ed air, or other deleterious matter, to the cylinder or' valve-chest,1 the val-vc beingonly arranged to open outward,` for the passage of the exhaust-steam to the smoke'chamber.

With a valve, arranged for operation within theel haast-passage of an engine, substantially as above described, it is plainly apparent, that while but little obstruction is given to the escape of the exhaust-steam the smol'rechamber, to the cylinder or valve-chest, is

entirely and eii'ectually prevented, a result of the utmost importauce'and advantage in the running of a locomotive-engine, more particularly, as, for instance, when the engine is running without steam in the cylinders, and by its previous-acquired momentum, or when the engine is reversed, in order to stop quickly, for the reason that, in such cases, without'the said valve, there would be no hindrance to thepassage of cinders, 85o., from the smokechamber to the cylinder and valve-chest, which ciuders, 85o., being gritty, would cause great injury tothe pistons and valves, as welles to the cylinders and valve-chests, linally destmying and rendering them useless.

And it may .be here observed, that while the safety valves of most locomotive engines are sufficient for all ordinary purposes and occasions, they are greatly de festive iu this respect: that they allow, even when wide open, the-pressure in the boiler to accumulate to a fearful extent at times, as, for instance, whenfthe engine, with a heavy train, is moving over a down grade, and it becomes absolutely necessary, for safety, to chock the speed of the train, by reversing the engine; for, if then the pressure upon the pstonsbe not sufficient to hold the driving-wheels, oritoturu them backwards, the air from the smoke-box is necessarily pumped into the boiler, thus raising the pressure therein much faster than the safety-valves are able to relieve it, and, as a consequence, either exploding'the boiler or collapsing the tubes, the latter, more generally, being the, result. obvious, is a source of great annoyance and expense to roads that haveheavy grades, and necessarily heavy engines to run their trains and, consequently, in lieu of reversing the engine, the engineers generally depend upon the ordinary brakes of the cars to retard or hold the train, which are not only complicated but expensive arrangements, while, if the engine could be reversed without dangerof exploding the boiler or collapsing the tubes, no better or more perfect and sure hiuke could be had; and by my invention, as is manifest, the engine is so enabled to be employed, without the least danger thereto or to its boiler, as the inward passage or pumping ofthe heated air, &c., from the smoke-box cannot possibly occur, but is entirely prevented.

v In addition to the several advantages and results above stated as secured by my invention, it maybe well to here observe that, as auotherconsequenoe of the exclusion of gritty particles, heated air, &e. from the `cylinders and valve-chests of an engine, less oil is required to ne employe-dto keep the cylinders, 85o.,

lubricated, as' the full effectof the steam, for such This effect, as is y purposes, is secured, (steam being well known to bea sucient lubricat-or therefor,) thus reducingin that respect, the expense of ruiming the engine.

By the au'an gement of the valve B above described, it is 'left free to close by its own gravity, or by the pressure of the atmosphere within the smoke-box; bui; springs may be employed in connection with it, if so desired.

`In locating thevalve within the exhaust-passage, I prefer, for convenience, to place itat the extremity of such passage, the fas'thest lemoved from the cylinders, f

but it may be located at other polnts and further, more than 'one valve may be emp1cyed,fso desired.

Having thus described my improvement, I claim as follows:

I claim the. valve B, Iend its arrangementrelating to the seat Dl in the exhaust-passage A .of a locomotive or other analogous engine liable to be reversed, as herein ,set forth.

I In testimony whereof, I have hereunto'set my name, in the presenue of two subscribing witnesses.

' THS. S. DAVIS.

Witnesses W. (l. DEY, A. HOERMANN.

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