US689740A - Fuel-feeding mechanism for furnaces. - Google Patents

Description

No. 689,740. Patented Dec. 24, I90]. W. McCLAVE.

FUEL FEEDING MECHANISM FOR FURNACES. (Application filed Feb. 13; 1901.

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no. 689.740. Pat ent ad Dec. 2.4, l90l.

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UNITED STATES,

PATENT OFFICE.

WILLIAM MCOLAVE, OF SORANTON, PENNSYLVANIA.

'FUEL-FEEDlNG MECHANISM .FOR FURNACES.

sracrrlcarroiv forming atter Letters Iatent 1%. 689,740, dated December 24, 1901.

l I. Application filed February 13. 1901. Serial No 47,164. (Remodel-l To'aZl whom it may concern.-

Be it known that I, WILLIAM'MCCLAVma citizen of the United'States, residing at Scranton, in the county of Lackawanna and State of Pennsylvania, have invented'certain new and useful Improvements in Fuel-Feeding Mechanism for Furnaces; and I do hereby declare'th'e following to be a full, clear, and eX- act description. of the invention, such as will enable others skilled in the art to which it appertains to make and "use'the same.

My invention relates to improvements in fuel-feeding mechanisms for furnaceswhereby the fuel may be forcedinto'the furnace regularly and uniformly and in greater or less qnantities, as may be required, and is more particularly designed for supplying fuel to furnaces employing 'stoking-grates. 7

It also relates to improvements in mechanisms for furnaces for obtaining easy access to the interior of same and for the admission of Y the dead-plate of the furnace-grate.

air above the plane of thefire-surface when required.

It consists in stoking means for furnaces, comprising a hopper for delivering fuel tothe furnace, said hopperbeing provided near the lower portion of its rear wall with an opening, a swinging gate at the bottom of the hopper for controlling thedischarge of fuel therefrom, a door pivoted to the front wall of the hopper, said gate and door each adapted to close said opening, and a reciprocating pusher below the fuel-gate.

It furtherconsists instoking means for furnaces made up of a hopper for deliveringfuel to the furnace, a passage-way being provided below said hopper which leads'into the f urnace, a gate for controlling the discharge of fuelfrom the hopper into said passage-way, a door arranged near the outer end of said passage-way for controlling the entrance of air thereto, and means for forcing the fuel from the passage-way into the furnace.

It further consists of certain other novel constructions and combinations, as will be hereinafter fully described and set forth.

In the. accompanying drawings, forming part of this application, Figure 1 is a vertical transverse section through a stoking-hopper embodying my invention and also illustrating the arrangement of the same with'respect to Fig. 2

is a front elevation of the said hopper. I 3 is a detail sectional View showing the manner of mounting the fuel-controlling gate in 55.

the hopper.

My improved stoking mechanism is well Fig.

naces employing inclined grates which are 6c adapted to assist in the stoking of fuel. My

improved stokiug-hopper is especially designed for. use in connection with an inclined grate such as described and claimed by me in with, Serial No. 47,163. The hopper is'so designed ihat fuel can be fed continuously and,

at a rate ofspeed corresponding with the speed an application for patent of even date herethe grate-operating lmechanism itself, the

structure being suchalso thatt'he fuel can be. checked to allowa chance to gain access'to the top' of thegrate from the furnace-front when it is needful to bank the fire or to perform some other operation on the grate-surface.

In this instance also the amount of air which is admitted to the top of the grate when the fires are banked can be controlled to a nicety. In constructing such a stoking-hopper I preferably arrange the same upon the front of the furnace immediately above-the deadplate thereof, the said, hopper l beingformed' With arear plate, as 2, end plates 33, and a front plate 4, which latter is inclined from the front toward the rear, as illustrated in Fig. 1 of the drawings. The rear plate 2 of the hopper is secured to the furnace-'structure in such, manner as to leave an air-space, as at 5, behind? the same, whereby the hop space may also be employed to supply-air to the top of the grate, it being preferable to locate to the rear side of the plate 2 and below the air-spaces 5 a twyer 6, provided with peris protected from extreme heat, and this go suitable openings or passages,as 7 7, of appropriate size to admit the proper quantity of air to prevent the formation of smoke at the top of the grate. Another plate may be This structhe hopper.

ture is convenient and forms a good backing for the hopper in a furnace of the character shown. This structure, however, is not essential to the invention, as other structures may be employed in connection with the hopper.

At the lower end of the front plate 4 is suspended a swinging door or gate, as at 11, which is journaled at its ends in journalblocks 12, secured to the end walls 3 of the hopper. These journal-blocks 12 are preferably bolted, as at 13 13, to the inner surfaces of the said wall and are provided with journal-bosses 14 14, which project through apertures 15, formed in the said end walls 3. The trunnions formed at the ends of the said gate 11 extend through the said apertures, and at one end of the hopper one of the said trunnions is preferably extended a sufficient distance to receive a ratchet-wheel, as 16, which is controlled by a pawl 17, pivoted to the end wall of the hopper. This trunnion also projects beyond the ratchetwheel 16 and has secured to it a lever-stub, as 18, which may be engaged by a socketed lever for turning the trunnion and swinging the door 11 at the bottom of the hopper. The swinging door 11 is so arranged that when itis swung upwardly its lower edge will meet the lower edge of the rear wall of the hopper and may thus be made to completely shut off the flow of fuel from the hopper at any time. The said door 11 may be held in any desired position by the pawl 17 engaging the teeth of the ratchet-wheel 16, and thus the door may be held in any intermediate position for regulating the amount of fuelwhich passes outof The upper edge of the door 11 is preferably rounded, so as to fit snugly beneath the lower edge of the hopper-front 4, forming a close joint at this point no matter what the position of the said door.

It is desirable at all times to regulate the amount of air which may be permitted to enter the furnace at the point where the fuel enters the same, and in order to have this within the complete control of the furnace operators I employ an outer swinging door 19, which is pivoted at suitable pointssay clined wall 4 of the hopper.

at 20 20-upon the front surface of the in- This gate at its lower edge is adapted to rest when closed against the sealing-rib, as at 21, formed upon I a lower cross or bottom plate 22 of the hopper. By raising the door 19 from the said rib 21 a greater or less quantity of air may from the said pulley 25 and may be provided with a handle, as 26, by which the said chain may be pulled. This handle 2Q may be in the form of a counterbalance for the door, if desired, so that the door may be held open at different positions for regulating the amount of air permitted to enter at this point. This door forms an important feature of the present invention, for when the fuel is checked in its flow by closing the gate 11 a large space would be left open at the top of the grate through which air would be admitted, and this would be objectionable, since it would permit the inflow of too large a quantity of air at this point. The door 19, therefore, may be advantageously used at this time to entirely exclude the air or to admit small or large quantities of thesame.

The stoking-hopper is preferably arranged immediately above the dead-plate 27 of the furnace, and in order to force the fuel downwardly from such dead-plate as it drops from the hopper I employ a reciprocating slide or pusher, as at 28, which is adapted to work between the upper surfaces of the dead-plate and the lower surfaces of the hopper-bottom plate 22. The lower edge of the said bottom plate 22 is preferably arranged to come very closely to the upper edge of the said pusher 28, so that the fuel will not be carried upwardly behind the said plate by the action of the pusher 28. The pusher 28 is made of an elongated body portion having downwardlyprojecting strengthening-webs. Two of the said webs, as 29 and 30, form the front and rear walls of the pusher, respectively. While the pusher may be constructed to operate upon a horizontal dead-plate, it is preferable to employ an inclined dead-plate, as shown in the drawings, and to construct the said pusher of such shape as to be capable of action between an inclined dead-plate and an inclined bottom plate 22, I therefore arrange the walls 29 and 30 and the strengthening-ribs in a vertical plane, the upper surfaces of the said pusher being inclined thereto. The forward edge of the pusher is adapted to extend a suitable distance beyond the front edge of the plate 22 and will force all fuel which drops in front of the same from the hopper down to the dead-plate and onto the top of the grate. In order to render the operation of the pusher without a great deal of friction, I preferably mount the pusher on antifriction-rollers, as at 31, which are preferably pivoted upon studs 32, secured to the inner surfaces of the end walls of the pusher. These antifriction -rollers 31 project sufiiciently below the lower edge of the pusher to support the same at a slight distance from the surface of the dead-plate. In order to reciprocate the said pusher, I connect the same, by means of rods or links 33,with actuating-arms 34. outside the furnace-front, the said links 33 projecting through suitable openings in the said front. These arms 34 are pivoted upon brackets 36, which are riveted to the furnacetrated and described in the application for patent above referred to. This manner of operating the mechanism, itwill be seen, consists in connecting the said arms, by means of links or rods 37, withvarms 38, secured to the rock-shaft 39, which is mounted beneath the dead-plate 27. The shaft 39 may be rocked in any suitable manner, but is preferably operated in conjunction with the movement of the stoking-grate bars of the furnacegrate. As shown in the drawings, the rockshaft is provided with an arm 40, which is connected, by means of link 41, with the upper grate-bar 42, the said arm being also connected, by means of another link 43, with an actuating rocking lever44. This lever 44 is loosely pivoted upon the shaft 45, which is arranged just inside the furnace-front. The upper end of the rocking lever 44 is connected, by means of a link 46, with an adjust-able block 47, arranged in a swinging yoke 48. A power rock-shaft, as 49, is arranged outside the furnace-door and carries the yoke 48.

The block 47 is adjustable in the yoke 48, as

described in the application referred to above, and therefore needs no further description in this application. The rocking ofthe shaft 48 will thus transmit motion through the links and levers described to the rock-shaft 39, and the arms 34, above described, will cause a reciprocation of the pusher 28 in correspondence with the movement of the upper grate bar 42. This is desirable, since the pusher will always supply enough fuel to occupy the space left by the fuel pushed down the grate through the operation of the upper grate-bar and Will prevent the forming of a gap in the fuel at this point. It would be also undesirable to force a greater quantity of fuel upon the grate than could be disposed of by the upper grate-bar, as this would cause the fuel to pile up on the grate at this point. Itwill of course be apparent that I might use any direct means for operating the pusher 28 without departing in the least from thespirit of my invention.

In furnaces employing two or .more gratesections it is preferable to provide a hopper for each grate-section, and each hopper will be provided with its own gate 11, door 19, and pusher 28. Of course a hopper could be constructed to extend entirely across one furnace whether the same had two or more grate-sections; but this would render the doorsunnecessarily heavy and more difiicult to operate,

and the more desirable way is to provide a separate hopper for each grate-section.

From the above description it will be apparent that my improved stoking-hopper is well adapted for use in connection with 'in-,

clined stoking-grates and capable of adj ustment to accommodate itself to a grate or furnace towhich it might be applied. The use of the door 19 in connection with the gate 11 makes it possible also to gain access to the upper surface of the grate at any time without having to empty the hopper of its fuel, a

feature which has not been heretofore em- 1 bodied in hopper mechanisms of a similar character.

While I have shown the door 19 as pivoted at its upper edge, it will be evident that it can be pivoted at its lower edge and opened downwardly. It also might be hinged at its end or could be hinged at both ends and open from the center each way, all within the spirit of the invention.

Having thus described my invention, what I claim, and desire to secure by Letters'Patout, is- 1 1. In stoking means for 'furnaces,.the combination of a hopper for delivering fuel to the furnace, said hopper being provided near the lower portion of its rear wall with an opening,

a swinging gate at the bottom of the hopper for controlling the discharge of fuel therefrom, a door pivoted tothe front wall of the hopper, said. gate and door each adapted. to

close said opening and a reciprocating pusher below the fuel gate, substantially as described.

2. In stoking means for furnaces, the combination of a-hopper for delivering fuel to the furnace arranged above the dead-plate of said furnace, said hopper being providednear the lower portion of its rear wall with an opening, aswinging gate at the bottom of the hopper for controlling the discharge of fuel therefrom, a pivoted door on the front wall of the hopper, said gate and door-being each adapted to close the said opening and a reciprocating pusher adapted to travel back and forth on the dead-plate beneath the hopper for forcing the fuel into-the furnace, substantially as described.

3. In a stoking means for furnaces-,the

otal points and holding it in various adjustable positions, a door pivoted on the front wall of the hopper, said gate and door being each adapted to close said opening, and means below. the fuel-gate for forcing fuel into the furnace, substantially as described.

4. In stoking means for furnaces, the combination of a hopper for delivering fuel to the furnace, said hopper being providednear the lower portion of its rear wall with an opening, a swinging gate at the bottom of the hopper for controllin g the discharge of fuel therefrom, a ratchet-wheel secured to one of the trunnions of said gate, a pawl for holding the same, a lever-stub secured to the end of one of the gate-trunnions, whereby a socketed 1e ver may be employed for operating the swinging gate, a door pivoted to the front Wall of the hopper, said gate and door being each adapted to close said opening, and reciprocating means below the hopper for forcing fuel into the furnace, substantially as described.

5. In stoking means for furnaces, the combination of a hopper for delivering fuel to the furnace, said hopper being provided near the lower portion of its rear wall with an opening, a swinging gate at the bottom of the hopper for controlling the discharge of fuel therefrom, a door pivoted to the front wall of the hopper, the said gate and door being both adapted to close said opening, a reciprocating pusher below the fuel-gate, and wheels supporting said pusher, whereby it may be easily moved back and forth, substantially as described.

6. In stoking means for furnaces, the combination of a hopper for delivering fuel to the furnace, said hopper being provided near the lower portion of its rear wall with an opening, a swinging'gate at the bottom of the hopper for controlling the discharge of fuel therefrom, a door pivoted to the front wall of the hopper, the gate and door being both adapted to close said opening, a reciprocating pusher below the fuel-gate, actuating-arms mounted outside the furnace-front and connected with the pusher, and means for moving the arms back and forthupon their pivotal points forreciprocating the pusher, substantially as described.

7. In stoking means for furnaces, the combination with a hopper for delivering the fuel to the furnace, said hopper being provided near the lower portion of its rear wall with an opening, a swinging gate at the bottom of the hopper, for controlling the discharge of fuel therefrom, a door pivoted to the front wall of the hopper, the gate and door being both adapted to close said opening, a reciprocatingpnsher located below the hopper, links pivotally connecting the said pusher with operating means outside the furnace-front, levers pivoted to said front and connected with said links, a rock-shaft mounted beneath the dead-plate of the furnace for connecting the said levers, and adjustable means for varying the extent to which the shaft is rocked, whereby a greater or less force may be imparted to the pnsher when it isreciprocated, substantially as described.

8. In stoking means for furnaces, the combination with a hopper provided near the lower portion of its rear wall with an opening, of a swinging gate at the bottom of the hopper, for controlling the discharge of fuel therefrom, a door pivoted to the frontwall of the hopper, said gate and door being each adapted to close said opening, a reciprocating pusher beneath the fuel-gate, a rock-shaft mounted beneath the dead-plate gate and connected with said pusher for actuating the same, one or more of the grate-bars of the furnace being connected with the said rockshaft, levers and links connecting said rockshaft with a swinging yoke outside the furnace-front, means for varying the amount of movement imparted by the yoke, an outer shaft carrying said yoke, the construction being such that motion will be imparted to the pusher beneath the hopper, which corresponds exactly with the motion imparted to one or more of the grate-bars of the furnace, substantially as described.

9. In stoking means for furnaces, the combination of a'hopper arranged above the deadplate' of the furnace, a passage-way being formed between the dead-plate and the hopper for admitting air to the top of the furnacegrate, a bottom plate in said passage-way forming between it and the dead-plate, a recess for a pusher for forcing fuel from the passage-way into the grate, a swinging gate at the lower end of the hoppers front wall, adapted to control the discharge of fuel from the bottom of the hopper, said gate when in its open position resting against the said plate in the passage-way, a door pivoted to the front wall of the hopper and engaging a flange on the passage-way plate, and means for raising and lowering the door whereby air may be admitted to the passage-way at this point or may be entirely shut off from the same, substantially as described.

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

WILLIAM MCCLAVE.

lVitnesses:

FENTON S. BELT, RICHARD B. CAVANAGH.

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