US404739A - Exhaust mechanism - Google Patents

Description

(No Model.)

J. D. SMITH. EXHAUST MECHANISM.

No. 404,739. Patented June 4, 1889.

UNIT D STATES PATENT OFFICE.

JOHN D. SMITH, OF MURFREESBOROUGH, TENNESSEE.

EXHAUST MECHANISM.

SPECIFICATION forming part of Letters Patent No. 404,739, dated June 4, 1889. Application filed December 18, 1888. Serial No. 293,938. (No model.)

To all 1072,0712 it may concern:

Be it known that I, JOHN D. SMITH, of Murfreesborough, in the county of Rutherford and State of Tennessee, have invented certain new and useful Improvements in Attachments for Exhaust Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings,which form part of this specification.

My invention relates to an improvement in attachments for exhaust mechanism; and the object of my invention is to place in the smokestack a pipe which is movable at its lower end in relation to the exhaust-pipe, whereby the exhaust-steam can be turned into the lower end of the movable pipe, which is contracted and perforated at its upper end for the purpose of destroying the draft through the stack when the door of the furnace is opened.

Figure 1 is a perspective of a boiler, partly in section, showing my attachment applied thereto. Fig. 2 is a vertical section taken through the stack.

A represents the boiler of a portable steamengine or locomotive, B its stack, and O the exhaust-pipe leading from the cylinder of the engine. Extending horizontally through the stack, at anysuitable distance above its lower end, is the pivotal rod D,upon which the pipe F, having a number of perforations through its upper end, is placed. Upon this rod, at each side of the pipe F, is placed a stop, G, in order to prevent the pipe from having any lateral movement in the stack and thus becoming displaced. Extending through the stack near its lower end is a revolving shaft H, which is provided with a crank I, inside of the stack, for operating the lower end of the pipe F, and a crank J at one end, to which the operating-rod L is connected. The crank I inside of the stack is loosely connected to the lower end of the pipe F by means of a catch 0, of either the form here shown or any other which will answer the same purpose. This catch allows the crank I to move freely along the side of the pipe at the same time that the lower end of the pipe is moved laterally, so as to bring it directly over the mouth of the exhaust-pipe C,

or move the end of the pipe F to one side, where the exhaust-steam escaping from the pipe 0 will not enter into the pipe F. The operating-rod L has the notches or recessesQ in it near its outer end, so as to catch upon the projection R, formed upon the top of the boiler, and thus hold the rod and the pipeF into any position into which they may be adjusted. \Vhen the rod F is moved into the position shown in solid lines in Fig. 1, the exhauststeam is discharged directly into the lower end of the stack for the purpose of creating an increased draft in the usual manner. When the pipe F has its lower end moved directly over the end of the exhaust-pipe O, the exhaust-steam passes through the pipe F and is discharged into the stack through the perforations made in the upper end of the pipe. These perforations serve to break up the steam into small jets, and, these jets being discharged into the stack at a suitable distance above its lower end, they do not affect the draft, as is the case when the exhaust-steam is discharged directly into the lower 'end of the stack.

I do not limit my invention to the exact mechanism for operating the pipe F, for this may be varied at will without departing from the spirit of my invention.

This pipe applied to portable engines and locomotives serves to protectthe flues and the interior of the fire-box, and it saves steam, fuel, and labor, and is a great protection against those fires which originate from the sparks which are blown out of the stack. If the door of the furnace is opened While the steam is being exhausted directly into the lower end of the stack, a great draftis created through the furnace, and the cold air in passing through the furnace and boiler injures both the fire-box and the flues by the sudden contraction which it causes. As the pipe Fis to be moved over the exhaust-pipe C before the furnace-door is opened, the draft through the stack B is destroyed, and the fire-door may be opened and closed at leisure without the loss of steam or damage through the firebox or flues. When the fire is being stirred, more sparks are detached from the burning fuel than at any other time; but, as there is no current of air passing through them, they fall into the ash-box and do no harm. This attachment overcomes all contraction and expansion of the fire-box and flues, as no cold air is admitted through the fire-door, causing expansion and contraction each time the door is opened and closed; but an approximately uniform degree of heat is retained at all times. As will be seen, the upper end of the pipe is contracted or has a small opening" through it, so as to send a jet of steam directly up through the stack for the purpose of carrying the smoke and the exhausted steam. The upper end of the pipe should not be left entirely open nor entirely closed, as an upward j ct of steam is very necessary.

Having thus described my invention, I claim" The combination of the stack, the exhaustpipe, a pipe pivoted in the stack and having its lower end movable in relation to the eX- haust-pipe, and a meehanism for adjusting the lower end of the movable pipe, the upper end of the movable pipe beingeontracted and perforated and thereby partially closed, substantially as described.

In testimony whereof I alfix my signature in presence of two witnesses.

JOHN D. SMI'llI.

\Vitnesses:

\V. (LVFROS'JQV H. (Human.

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