US711669A - Mechanical stoker. - Google Patents

Description

E. MCCOVNNELL. MECHANICAL sTuKE. (,'Application led June 3, 1902.)

2 Sheets-Sheet I.

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E. MccoNNELL.

MECHANICAL STOKER.

(Application med June 3, 1902.|

(No Model.)

2 Sheets-Sheet 2.

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Inventar."l www on. u, c.

m: ohms Pnzns co., sumo-Umb.. wnsumcr AUNITED STATES PATENT OEEICE.'

ELLICOTT MCCONNELL, OF BROOKLYN, NEW YORK.

MECHANICAL sToKER.

SPECIFICATION forming part of Letters Patent No. 711,669, dated October 21, 1902.

Application tied :rete 3,1902. sentito. 110,025. (No man.)

To all whom it may concern.; l

Beit known that I, ELLIooTT'McCoNNELL, acitizen of the United States, residing in the borough of Brooklymcity of New York,county of Kings,and State of New York,have invented a new and useful Improvement in Mechanical Stokers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

Myinvention relates to mechanical stokers. It is particularly adapted to application to the fire-box of a locomotive, although it is applicable with equaladvantage to a stationary boiler.

One of the difficulties incidental to mechanical stoking is to secure an even and uniform distribution of the fuel over the grate-V surface.

. The object of my invention is to effect an even distribution of coalover the entire gratesurface. This I accomplish by such a construction and arrangement of an underfeed stoker that the coal will be uniformly distributed along the longitudinal center line of theY grate and thence spread out over the grate and toward the sides thereof in a layer of substantially uniform thickness.

The invention consists of the combination,

with the grate, of a reciprocating fuel retort,`

' nately cover and uncover the same in the reciprocating movement of the trough.

The invention also consists in a special arrangement of the deflectors as to location and relative size, in a special construction of said dei'lectors, and in details of construction and arrangement.

In the drawings,Figure 1 is a side elevation of a locomotive with my invention applied. Fig. 2 is longitudinal section, showing in detail the bottom of the lire-box, Stoker, and hopper. Fig. 3 is a plan view of Fig. 2. Fig. 4 is asection on line 4 4 of Fig. 2. Figs. 5, 6, and 7 are sections ou line 5 5 of Fig. 4,

showing the different positions assumed by one of the pivoted-deiectors at different positions of the Stoker. Y

A is the fire-box of a locomotive; X', the boiler. The grate of the ire -box is composed of two sets of grate-bars B B, said grate-bars being shown as extending transversely and 'the two sets extending longitudinally of the Iire-box and separated by an open space.

.The inner end of each trausversely-extending grate-bar rests in a bearing in one of the longitudinally-extending bearing-bars Y Y, while the other end rests ,in a bearing in one of the longitudinally extending bars Z Z.

These bearing-bars are each secured to the mud-ring M of the fire-box by means of bolts m.

Secured to the bearing-bars Y Yare a plurality of brackets y, which extend below the bearing-bars. c represents rollers rotatable in bearings in the lower ends of oppositelylocated brackets y. v l

C is a trough or conveyor, of steel, castiron, or other suitable material, of greater length than the length of the fire-box or the longitudinaldimensions of the grate-surface,

said trough 'resting on the rollers c. The bearing-bars Y Y are provided with recesses extending throughout their entire length of ya depth substantially equal to the thickness` of the side members of the trough, and the larly hinged at its base to the foot-plate, so

as to be capable of yfolding outwardly and downwardly. Any fuel-supply device may be substituted for the hopper.

Extending between and through the bear ing-bars Y Y are a plurality of shafts e, having secured thereto, between the bearing- Vbars,`deflectors E, extending normally down into the trough C. Embracing and secured ICO to the outer ends of said shafts, outside of the bearing-bars, are arms F, resting upon stops f, secured to the outside of the bearingbars. g represents lugs secured to the outside of the bearing-bars, and G represents springs, one end of each spring being secured to Said arm F and the other end to said lug g. The deflectors E are thus free to swing forwardly and upwardly, except so far as they are restrained bythe springs G; but they are prevented from swinging backwardly beyond the vertical position by the engagement of arms F against stops f'.

Secured near the rear end of the trough and overhanging the same is a fiat plate K, preferably toothed, as shown.

I have provided the following means for reciprocating the trough C Secured to a cross tie L of the locomotive is a motor H. This motor consists of a cylinder and piston and valve-gear of any ordinary construction, the same being driven by steam from the boiler or by compressed air from the brake system. The piston-rod 72, is attached to a lug c'.

The operation of the Stoker constructed as I have described is as follows: Normally the parts are in the positions shown in Figs. l to 5, inclusive. The plate K is immediately back of the mouth of the hopper, and the defiectors E hang vertically, permitting coal to be deposited into the trough. Steam or air being admitted to the cylinder of motor I'I, the trough or conveyer C reciprocates. The initial movement is a forward one, causing the coal to be carried forward, and the forwardlymoving plate crushes or breaks any large masses or lumps of coal that may be lodged in the mouth of the hopper. The backward movement of the trough uncovers the mouth of the hopper and permits another charge of coal to be deposited into the trough. At each successive forward movement of the trough the contained coal is carrried forward and a fresh supply of coal is received from the hopper until the trough is illed throughout its entire length. The deliectors E are actuated in the following manner: In the forward movement of the trough the forwardly-moving coal pushes the deflectors forwardly and upwardly on their pivots. (See Fig. 6.) On the return stroke the deectors swing in the opposite direction-z'. e., downward and backward, (see Fig. 7)-being urged in that direction bythe return movement of the coal and further constrained by the springs G. The detlectors cannot swing back beyond a vertical position, as their movement is stopped by the engagement of arms F with stops j.

By the described operation a portion of the coal contained in the trough is lifted and deposited on the grate-surface either in front of or behind the respective deectors during both the forward and backward movement of the trough.

The location and size of the defiectors will depend upon the particular design of the locomotive to which the stoker is applied and will also depend upon the dimensions of the trough and the distance thereof below the grate surface. Ordinarily, however, if the deliectors are of uniform size and uniformly distributed beneath the grate surface the tendency will be to Vdistribute the coal unequally and discharge an excessive quantity of coal ovel` the portionof the grate-surface farthest from the hopper. I find that I can obviate this by placing the dedectors of larger dimensions nearer the hopperend of the stoker. Thus the defiector nearest to the hopper is shown as substan tially longer than the deflector farthest from the hopper, while the intermediate deflector or deflectors is shown as of an intermediate length. Thus the tendency to bank up the coal at the front of the grate is counteracted by the decreased feeding capacity of that end of the Stoker. The deflectOr nearest the throat of the hopper besides acting as a fnel-distributer performs also the specific purpose of a gate, as it prevents the coal on the return stroke from being drawn back under the mouth of the hopper, which would prevent a fresh charge of coal falling into the conveyer or trough.

Having now fully described Inyinvention,`

what I claim, and desire to protect by Letters Patent, is-

1. In a mechanical stoker, the combination, with the grate, of a fuel-retort beneath the grate, means for reciprocating the fuel-retort, fuel-distributing devices within the retort, and means to introduce fuel to the retort.

2. In a mechanical Stoker, the combination, with the grate, of a conveyer beneath the grate, means for reciprocating the conveyer, deflectors within the conveyer adapted to swing on stationary pivots, and means to introduce fuel to the conveyer.

3. In a mechanical stoker, the combination, with the grate, of a fuel-retort beneath the grate,means for reciprocating the fuel-retort, fuel-distributing devices within the retort but not movable therewith, and means to introduce fuel to the retort.

4. A mechanical stoker consisting of a reciprocatory fuelcontaining trough, and deflectors within the trough adapted to swing on stationary pivots.

5. In a mechanical Stoker, the combination, with the grate, of a fuel-retort beneath the grate, means for reciprocating the fuel-retort, movable fuel-distributing devices within the retort but not reciprocating therewith, and means to introduce fuel to the retort.

6. A mechanical Stoker consisting of a reciprocatoryfuel-containing trough, deiiectors within the trough adapted to swing on stationary pivots, and a hopper at one end of the trough, the deflector nearest the hopper being substantially larger than the deflector most remote from the hopper.

7. A mechanical stoker consisting of a reciprocatory fuel-containing trough, and deflectors within the trough adapted to swing on stationary pivots, and a hopper at one end of the trough, the defiector nearest the hopper being substantially larger than the deflector most remote from the hopper, and the IOC IIO

intermediate delector or detlectors being of- 9. In a mechanical stoker, the combination,`

with the grate, of a fuel-containing trough having fioor and sides and open at the top and located beneath the grate, means for reciprocating the trough, means to introduce fuel into the trough at one end thereof, and a deiiector or gate, within the trough, but not movable therewith, adjacent to that end of the grate nearest the fuel-supply end of the trough.

10. In a mechanical stoker,the combination, with the grate, of a conveyer beneath the grate, means for reciprocating the conveyer, means to introduce fuel into the conveyer at one end thereof, and a gate within the conveyer adjacentV to that end of the grate nearest to the fuel-supply end of the conveyer, said gate being adapted to swing on a stationary pivot.

11. A mechanical stoker consisting of a reciprocatory f nel-containin g trough, deflectors within the trough adapted to swing on stationary pivots, said defiectors occupying a normally vertical position, and tension devices tending to restore said deflectors to their normal or vertical position.

12. A mechanical Stoker consisting of a reciprocatory fuel-containing trough, deflectors within the trough adapted to swing on stationary pivots, and stops adapted to limit the movement of said deiiectors in one direction.

13. A mechanical stoker consisting of areciprocatory fuel-containing trough, deiiectors within the trough adapted to swing on stationary pivots, said deflectors occupying a normally vertical position, tension devices tending to restore said del'lectors to their normal position, and stopsy adapted to limit the movement of said deflectors in one direction.

14. In a mechanical stoker,the combination, with the grate, of two bearing-bars, spaced apart, beneath the grate, afuel-containing trough having floor and sides and open at the top and located beneath said bearing-bars, means for reciprocating the trough, fuel-distributing devices Within the trough but not movable therewith, and means to introduce fuel to the trough.

15. In amechanical stoker,the combination, with the grate, of two bearing-bars, spaced apart, beneath the grate, a fuel-containing trough having floor and sides and open at the top and located beneath said hearing-bars, the inner walls of the bearing-bars and the inner side walls of the trough being substantially coincident, means for reciprocating the trough,fuel-distributing devices within the trough but not movable therewith, and means tointrod'uce fuel to the trough.

16. A mechanical stoker consisting of two stationary bearing-bars, spaced apart, a fuelcontaining trough having floor and sides and open at the top and located beneath said bearing-bars, means for reciprocating the trough, and fuel-distributing deflectors attached to said bearing-bars.

17. A mechanical stoker consisting of two stationary bearing-bars, spaced apart, brackets depending therefrom, rollers sustained in said brackets, a fuel-containing trough having floor and sides and open at the top and resting on said rollers, and means to reciprocate the trough.

1S. A mechanical stoker stationary bearing-bars, spaced apart, brackets depending therefrom, rollers sustained in said brackets, a fuel-containing trough having iioor and sides and open at the top and resting on said rollers, fuel-distributing deflectors attached to said bearing-bars, and means to reciprocate the-trough.

19. A mechanical stoker consisting of two consisting of two v stationary bearing-bars, spaced apart, a conveyer beneath said bearing-bars, means for reciprocating the conveyer, a shaft extending between said bearing-bars, said shaft carrying a fuel-distributing deflector within the conveyer and an arm outside thereof, and a stop adapted to engage said arm and thus limit the movement of said detlector in one direction.

20. A mechanical Stoker consisting of two stationary bearing-bars, spaced apart, a conveyer beneath said bearing-bars, means for reciprocating the con veyer, a shaft extending between said bearing-bars, said shaft carry- IOO ing a fuel-distributing deector within the conveyer and an arm outside thereof, a stop adapted to engage said arm and thus limit the movement of said dei-lector in one direction, and a tension device secured to one of said bearing-bars and tending to swing said deiiector in one direction.

21. A mechanical stoker consisting of two stationary bearing-bars, spaced apart, a conveyer beneath said bearing-bars, means for reciprocating the con veyer, a shaft extending between said bearing-bars, said shaft carrying a fueldistributing deliector within the conveyer and an arm outside thereof, a stop adapted to engage said arm and thus limit the movement of said defiector in one direction, brackets depending from said bearing-bars, and rollers sustained in said brackets, said conveyer resting on said rollers.

In testimony of which invention I have hereu nto set my hand, at Philadelphia, on this 2 7 th day of May, 1902.

ELLICOTT. MCCONNELL.

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