US777330A - Damper. - Google Patents

Description

N0. 777,330. PATENTED DEG. 13, 1904l M. J. GARRIGAN.

DAMPEB..

APPLIUATIDN FILED JUNE 8. 1903. RENBWED NOV. l0 1904.

N0 MODEL. SHEL'l'SwHBBT` 1.

2 SHEETS--BHBET 2. G Z4 .AU 0 9 l .3 l Uw E D D E T N E T A D..

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M. I. CARRIGAN. DAMPER.

APPLICATION FILED JUNE s. 1903. RBNEWBD Nov. 10, 1904.

No MODEL.

Patented December 13, 1904:.

PATENT OEEICE.

MICHAEL JQ CARRIGAN, 0F GLENNS FERRY, IDAHO.

DAMER.

SECFICATION forming part of Letters Patent No. 777,330, dated December 13, 1904.

Application tiled June 8, 1903. Renewed November 10,I 1904;. Serial No, 232,253. (No model.)

To all whom, t may concern.'

Be it known that I, MICHAEL J. CARRIGAN, a citizen of the United States, residing at Glenns Ferry, in the county of Elmore and State of Idaho, have invented a new and useful Damper, of which the following is a specification.

This invention relates to dampers designed especially for use in the {ire-boxes of locomotives.

The object of the invention is to provide an improved form of damper whereby the feed of air to the iire-box may be controlled by the fireman in a simple and effective manner and by which the air supplied to the lirebox will be so directed as to facilitate the consumption of the smoke and the production of complete combustion.

With the object above stated and others in View, as will appear when the invention is more fully disclosed, the same consists in the construction and combination of parts of a damper hereinafter described, illustrated in the accompanying' drawings, in which corresponding parts are designated by the same characters of reference, and having the novel features thereof particularly pointed out in the appended claims.

In the drawings, Figure 1 is a View in vertical longitudinal section through the lire-box and the adjoining portions of a boiler, showing the damper in closed position in association with the fire-box. Fig. 2 is a detail View in section through the back head of the lireboX, showing the damper in open position. Fig. 3 is a view in section through the back head of the fire-box, showing a modified. form of damper in closed position.

Referring' to the drawings byreference characters, l designates the back head7 or rear wall of the {ire-box of a locomotive.

2 2 designate the side bars upon which are supported the transverse grate-bars 3.

4 designates a brick arch disposed over the forward portion of the fire-box and set on an incline with the rear margin thereof above the front margin, as shown. The arch l is supported in any suitable manner, as by inclined members 6. The line-sheet 7 is provided in front of the arch in the usual manner, and the lire-hox is provided at the rear with a door 8, covering an opening in the back head l.

` The rearmost one of the gratebars 3 is spaced from the back head l, as shown, leaving' an opening between the grate and the back head which extends transversely across the entire fire-box between the side bars 2. Pivotally supported immediately below the opening between the rearmost grate-bar and the back head is a dan1per-plate 9, I n'eferably supported by trunnions 1l), at the ends thereof resting in bearing-slots 1l in the ends of the side bars. l/Vhen the damper 9 is thus supported, the trunnions l() are disposed intermediate of the front and rear edges of the damper-plate and nearer the rear margin, as shown. The damper-platc is of such width that when raised into horizontal position the rearward margin lies substantially in contact with the back head and the forward margin is under the rearmost grate-bar, so closing completely the opening' left at the rear of the grate.

Above the level of the grate and over the opening at the rear is supported a curved iron shield 12, the lower portion of which is inserted into a socket 13, provided in an upwardly-dsposed extension 14 on each of the side bars 2. The shield lf2 lis provided with a plurality of perforations l5 to permit the free passage of air, and itis curved at the top so that the rear margin thereof rests against the back head 1. The shield l2 prevents the waste of coal by passing' downward through the opening' at the rear of the grate and also permits the passage into the furnace of air allowed to pass upward through said opening when the damper-plate is not in closed position.

A curved deiiector 16 is adjustably mounted above the shield l2 and extends over the upper portion thereof, as shown. The dellector 16 may be shifted in position so as lto vary in height above the shield l2 from three to iive inches, so that the defiector may be brought into most effective position in relation to the shield and to the damper. The purpose of the guide-plate is to direct the air which passes upward through the opening at the back of the grate when the damper is open forward and downward, so that it may not pass too soon up over the rear margin of the brick arch and forward to the flue-sheet. The delector projects only a short distance beyond the shield, so as to permit the fireman to deposit coal just in front of said shield.

Movement is imparted to the damper-plate by means of a bent connecting-rod pivoted at its forward end to a projection 17 on the lower surface of the damper-plate and pivoted at its rear end to one arm of a bell-crank level' 18, supported by an eyebolt 19, which is attached to the under side of the deck 2O of the engine-cab. From the other arm of the bellcrank lever 18 extends upward an operatingrod 21, provided with notches 22 in the side thereof to engage with a lug28 or other suitable locking member and having at the top a suitable foot-piece Q4. By means of a slight pressure upon the top of the foot-piece 24 the fireman can disengage the rod 21 from the locking member and can shift the rod up and down until the desired adjustment of the damper-plate has been effected. Then the damper-plate has been brought into suitable position, the notch upon the rod 21, adapted to hold the damper-plate in proper position, will be brought into engagement with the pin 23 or other locking member, thus securing the damper-plate at the proper inclination.

In the modified form of the invention (shown in Fig. 3) the damper-plate 9a is hinged at l()a to the back head 1 and the other parts of the structure are as already described.

In the operation of the damper mechanism above described the damper-plate 9 is always adjusted by the rod 21, which extends up through the deck of the locomotive-cab on the firemans side. By means of this rod the fireman is enabled to set the damper instantly at any desired inclination in relation to the plane of the grate-bars, so that the amount of air admitted may be accurately regulated to meet the needs of the fire. The damper-plate being pivoted near its rear margin and being arranged beneath the grate acts not only as means for controlling the size of the opening at the rear of the grate through which air may enter, but serves also as a deflector to direct upward through the opening at the rear of the grate the air which passes between the grate and the ash-pan. (Not shown.) Owing to the fact that the air which passes upward through the opening at the rear of the grate must first pass rearward between the grate and the ash-pan below it,the air will be warmed before it enters the fire-box, and itstendency to support combustion will be accordingly heightened. Furthermore, the fact that the air passes backward from the front of the ashpan, which is open, makes the pivoted damper-plate serve when the engine is in motion as means to produce a forced draft. The air which passes upward through the opening at the rear of the grate passes through openings in the shield and either goes directly forward or is directed forward and downward by the deflector mounted above the shield. The action of the deflector causes the air-currents passing through the shield to travel forward beyond the rear margin of the brick arch over the forward portion of the grate to effect complete combustion of the smoke and combustible gases in the fire-box before turning backward and rising over the rear margin of the brick arch in order to pass forward through the fire-tubes to the smoke-stack at the front of the engine.

While I have described in the foregoing paragraphs and have illustrated in the accompanying drawings the preferred form of embodiment of the invention, it is obvious that changes may be made in the form, proportions, and mode of assemblage of the elements without departing from the spirit of the invention or sacrificing any of its advantages.

Having thus described the nature and operation of my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination with the fire-box of a furnace, of a grate terminating a distance from one wall thereof for providing an opening through which air is forced from below the grate for intercepting the gases and products of combustion rising from the fire-bed, and means for bridging said opening to prevent the escape of fuel, comprising a curved plate abutting at its upper longitudinal edge against the said wall of the fire-box, and having an engagement at its lower longitudinal edge with the grate, said plate having orifices extending therethrough for directing air-currents close to the surface of the fire-bed and substantially parallel therewith, and other currents a distance above the first currents and at an angle thereto, substantially as described.

2. The combination with a fire-box, of a grate including cross-bars and side bars supporting the same and projecting' at one end beyond the outermost cross-bar between which cross-bar and the adjacent walls of the fireboX an opening is provided through which air is forced from below the grate to intercept the gases and products of combustion rising from the fire-bed, a curved perforated plate bridging said opening having an engagement at its lower edge with said projecting portion of the side bars and supported thereby, and at its upper edge an engagement with said wall of the fire-box, and a damper pivotally mounted at opposite ends in said side bars adjacent the outer ends of the same and having a swinging movement toward and away from the said wall of the fire-box, substantially as described.

3. The combination with a furnace, of a IOO IIO

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ire-bed having' an opening' at one margin thereof, a shield over said opening', and a de- Hector-plate adjustably mounted above the shield to direct the current of air downward toward the lire-bed, substantially asdescribed.

1l. The combination with a furnace having a transverse opening' between the lire-bed and the rear wall of the lire-box, of a damperplate beneath said opening, means for tilting plate having a similar curvature to said shield disposed above said shield, and at a slight distance therefrom, substantially as described.

6. The combination with a furnace, of a fire-bed having' an opening at the back thereof, a shield above said opening to preventthe escape of fuel, a deiiector above the shield to direct air-currents downward and forward, an arch over the forward portion of the lire-bed to prevent the direct passage of air-currents from the deflector to the lines leading to the smole-staclr, and means beneath the opening' at the back of the fire-bed for forcing a current of air upward through said opening.

In testimony that I claim the foregoing as my own I have hereto ailixed my signature .in the presence of two witnesses.

MICHAEL J. CARRIGAN.

Witnesses:

FRED SARS-ENT, EPHRAIM McDownLL.

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