US540669A - Furnace - Google Patents

Description

(N o Model.)

F. W. INGRAM & B. E. CARR.

FURNAGE. j

No. 540,669. Patented June 11, 18 95.

@Nrrnn I STATES PATENT omce.

FRANKLIN W. INGRAM AND ELMER E. CARE, OF CHICAGOfILLINO I S.

.FURNACE.

SPECIFICATIONforming part of Letters Patent No. 540,669, dated June 11, 1895.

' Application filed March 1,6, 1 894. Serial No. $3,899. (No model.)

To all wijwm, it mayvconcern:

Be i'tknown that we, FRANKLIN W. INGRAM and ELMER E. CARR, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have inventedcertain newand useful Improvements in Furnaces; and we do'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 appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, whichform a part of this specification. w

Our invention relates to self feeding furnaces. Its objects are, to provide for the delivery of the fuel to the forward end of the grate by dropping it thereon in small quanti' ties so that combustion may be maintained to the extreme front of the grate; to provide for close joints in connection with the movable parts of the stoker so as to prevent leakage when fine fuel is used; to provide for the regulation of the fuel feed; and to provide for the convenient use of the ordinary hand feeding doors in connection with mechanical feed apparatus. f

The invention consists in the location of the fuel magazine above the usual firing doors; the use of an inclined delivery plate below the mouth of the hopper, over which the pusher is adapted to reciprocate; asupplemental bar connected with the pusher for closing the jointbetween it and the plate over which it moves; special mechanical connection between the pusher and the source of power; a vertically movable plate for preventing leakage of fuel at the front of the grate ;*and such other parts and arrangement of parts as are hereinafter disclosed.

In the accompanying drawings, Figure 1 is an elevation of a portion of the face-plate of a furnace with our-automatic stoker attached. Fig. 2 is a sectional View on the line 2 2 of Fig. 1; and Figs. 3, 4, and 5 are detailsof the mechanism, Fig. 4 being a sectional view on the line 4 4 of Fig. 3, and" Fig. 5 being a sectional view on the line 5 5 of Fig. 1.

At A, isshownthe fire-box; at B, the front wall of the furnace; at O, the arch of the fire-box, and at R, the grate, which is of the form shown in our Patent of the United States, dated the 4thday r April, A. D. 1 93,

An aperture, D, is provided in the front wall, B, for the delivery of the fuel to the fire-box by the automatic stoking device, the fuel being discharged from a dead plate, d, which as shown,forms the roof of a hand feeding aperture, D, ordinarily found in furnaces and closedby the door, a, and, having the usual dead plate, 01'.

The fuel magazine, or hopper, is located across the front of the furnace, as shown at,

E, and is substantially.triangular, in cross section, the face plate, b, of the furnace servingas its back wall, its front wall, e, being inclined forwardly and terminating, approximately upon a level with the top of the aperture, D, so as to leave an opening between its lower edge and the face plate, I), for the delivery of the fuel. The ends, 6', e, of the hopper, are provided at their inner edges with flanges whereby they may be bolted to the facei plate,,b, and at their outer edges with parallel ribs, c forming a groove for the reception of the ends of the front plate, e. The two ends, 6, e, of the hopper, aredrawn together by means of the bolts, or rods, F.

An inclined delivery plate, G, is located across and below the mouth of the hopper,E, its inclination being the same as that of the front plate, 8, of the hopper, and its lower edgebearing snugly against the front of the furnace and upon a level with thedead plate, d. The plate, G, is supported by the bracks l ,A pusher, H, having a vertical face plate, rests upon the plate, G, and is adapted to play across themouth ofthe hopper, E, so as to crowd the fuel which falls uponfthe plate, G,

from'the hopper, over the dead plate, d. An upwardly inclined plate, h, extends backwardly from the top of the vertical plate of the pusher, H, under the front plate 6, of the hopper, its inclination being the same as the latter plate. The office of the plate, 71, is to prevent fuel falling behind the pusher, 'H, as the latter advances. Fingers, i, 'i, extend downwardly from one of the rods, F, beneath the plate, It, so that it may rest upon them.

The pusher, H, is provided with backwardly extending flanges, h, of any desired number, which flanges are vertically recessed for the reception of a bar, K, of the same length as the pusher, II, and which fits loosely within these recesses so as to ride upon the delivery plate, G, and close the joint between this plate and the pusher so as to wholly prevent the leakage of fuel.

The pusher, H, is actuated by means of a rock shaft M, journaled in the brackets, L, and also, if desired, in the end plates, 6, of the hopper, and connected with the pusher by means of a crank arm, m, and a link, m, running from the end of the crank arm to 2. lug on the central flange h. Power is transmitted to the rock shaft, M, from a rock shaft, 0, journaled in brackets, 0, secured to the face plate, I), below the doors, a. The connection between the rock shafts, M, O, is by means of a link bar, or pitman,P, connecting crank arms, 19, upon the shaft, M, andp', upon the shaft, 0. The means of applying power to the rock shaft, 0, are not shown and may consist of any of'the well known appliances for that purpose. The rock shaft, 0, also actuates the rocking grate, R, a connecting rod, q, leading from a crank arm, Q, carried by the shaft, 0, to the rocking bar, 0'', of the grate.

"When it is desired to feed a maximum quantity of fuel the pusher, H, is caused to reciprocate from the lower edge of the plate, c, forwardly. To reduce the quantity of fuel fed to the furnace, the pusher, II, is caused to recede beyond the lower edge of the plate, e, and to advance but a portion of the way across the mouth of the hopper, the pusher traveling through the same distancein either event. This change of feed is accomplished in the following manner, without changing the movement of the grate bars: The crank arm, 29, is radially adjustable with reference to the shaft, 0, being mounted thereon by means of .a collar, or band, T, from which hand there projects also a hand lever, S, carrying a pawl, 3, adapted to engage a segmental rack, Q. For convenience, We prefer to form the rack, Q, integral with the crank arm, Q, and to mount the band,T, upon a hub, t, of this crank arm, which is rigidly fixed to the shaft, 0, by means of a key, q. The band, T, is heldinits place upon the hub, t, by means of a collar, U, of greater external diameter than thehub,t, and which is secured to the shaft, 0, by means of a set screw, a.

By releasing the pawl, s, from engagement with the rack, Q, the angular position of the crank arm, upon the shaft, 0, may be changed without disturbing that of the crank arm, Q.

A stop plate, or bar, 0, is adjusted loosely between flanges, v, 1;, depending from the bed plate, 01', and riding upon the first leaves of the grate, R, thereby preventing the leakage of fuel over the front end of the grate.

\Ve do not desire to be limited to the pre cise mechanism for varying the fuel feed as minor changes may be made in the operating mechanism without departing from the scope of the invention.

By means of the construction herein shown and described, we are able to secure a delivery of the coal to the grates in such manner that fine bituminous coal may be used without danger of having it become impacted at thefront of the grates, and thereby greatly reducing the available grate area. VJe also secure the very decided advantage of being able to feed the furnace by hand while the fire is being kindled and during any period at which it may be found desirable to stop the action of the mechanical stoker, the pusher itself providing means for closing the feed opening at the mouth of the hopper, and thereby cutting olf the large induction of air which would otherwise destroy the draft of the furnace.

\Ve claim as our invention- 1. In a self feeding furnace, the combina tion with an inclined oscillating grate, of a fuel magazine, a furnace wall having a feed opening at the mouth of the magazine, and a dead plate forming the floor of the feed opening, its inner or delivery edge being directly over and at such elevation above the grates that the fuel is precipitated from the plate directly upon the grates, whereby the impacting of the fuel at the front of the grate is prevented.

2, In a self feeding furnace, the combination with an inclined oscillating grate, of a fuel magazine, a furnace wall having a feed opening at the mouth of the magazine, adead plate forming the floor of the feed opening, its inner or delivery edge being directly over and at such elevation above the grates that the fuel is precipitated from the plate directly upon the grates, whereby the impacting of the fuel at the front of the grateis prevented, and an opening for hand feeding between the grates and the dead plate of the opening at the mouth of the magazine.

3. In a self feeding furnace having a fuel hopper, or magazine, a reciprocating pusher for forcing the fuel into the combustion chamber, an oscillating grate and a power actuated rock shaft for transmitting motion to the pusher and to the grate, a crank-arm fixed to the shaft and adapted to actuate the grate, and a crank arm carried by the shaft for actu ating the pusher and adapted to be adjusted in angular position relatively to the fixed crank-arm whereby the travel of the pusher may be changed and the fuel feed varied without changing the grate action, substantially .as described and for the purpose specified.

IOC

the leakage of f uel is prevented, substantially as described and for the'purpose specified.

5. In a self feeding furnace the combina by the air supply through the hopper feedopening is restricted while the furnace is fed by hand.

In testimony whereof We affix our signa- I5 tures in presence of two witnesses.

FRANKLIN W. INGRAM. ELMER E. CARR.

Witnesses:

LOUIS K. GILLsoN, M. H. L. WING.

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