US1519382A

US1519382A - Underfeed stoker

Info

Publication number: US1519382A
Application number: US429968A
Authority: US
Inventors: Nathan M Lower
Original assignee: LOCOMOTIVE STOKER CO
Current assignee: LOCOMOTIVE STOKER Co
Priority date: 1920-12-11
Filing date: 1920-12-11
Publication date: 1924-12-16
Anticipated expiration: 1941-12-16

Description

Dec, 16,

N. M. LOWER UNDERFEED S'IOKER Filed Dec. 1920 4 Sheets-Sheet 2 Dec. 16, 1 4- 1,519,382 N. M. LOWER Y UNDERFEED STOKER Filed Dec. 11, 1920 4 Sheets-Sheet 5 Dec. 1924. 1,519,382

N.. M. LOWER UNDERFEED STOKER Filed Dec. 11, 1920 4 Sheets-Sheet 4 lfiyentor: jJf/hvz law a citizen of the United States, and resident toand which- Patented Dec. 16, 1924.

UNITED STATES PATENT OFFICE.

NATHAN M. LOWER, OF PITTSBURGH, PENNSYLVANIA, ASSIGNO'R TO LOCOMOTIVE STOKEB COMPANY, A CORPORATION OF PENNSYLVANIA.

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Application filed December 11, 1920. Serial No. 429,968.

To all whom it may concern: being formed in sections, as 19, 20, which Be it known that I, NATHAN M. LOWER, are located between the

channels

14, 15.

7 Fuel is delivered to the channel 13 from of Pittsburgh, county of Allegheny, and a conduit 21 entering through its bottom State of Pennsylvania, have invented cerand adjacent the front endof the fire-box, tain new and useful Improvements in Unthere being a conveying screw 22 within the derfeed Stokers, of which the following is a conduit 21 for advancing the fuel. Fuel is specification, and which-are illustrated in delivered into the conduit 21 from any suitthe accompanying drawings, forming a part able source, not shown. In the case of a thereof. locomotive fuel would be taken from the The invention relates to underfeed stokers tender, and inasmuch as the deviceis illusprimarily intended for use in connection trated as adapted for use on a locomotive with locomotives but readily adapted to the conduit 21 is shown as being sectional stationary furnaces. I in form, the two sections being united by The objects of the invention are to proa ball and socket joint, as 23, to permit vide improved means for feeding the fuel of relative movement of the two vehicles.

spreading it upon the grate surface, As the fuel enters the channel 13 a portion and to acilitate the coking of the fuel.

The invention consists in a structure such of lateral channels, the remainder being caras that hereinafter described and as illusried forward by the screw section 19, wheretrated in the. accompanying drawings, in upon a portion of it enters the next pair of lateral channels, and eventually all of Fig. 1 is a detail plan section of a furnace these lateral channels are su plied. v taken above its grate, some of the detailsof The bottom of the firex is inclined construction being in part omitted; downwardly from the central channel, and Fig. 2 is a detail central longitudinal consequently the fuel entering the lateral vertical section through the fire-box; channels will be advanced therein in part Fig. 3 is a detail, partly in section, of a by gravity. Tilting advancing plates, as

rear elevation of the furnace,- on line 3-3 24, are located in the bottoms of these several of Fig. 2; lateral channels, such plates at each side Fig. 4 is a detail section on the line of the fire-box being carried upon a single 4.-4 of Fig. 1, some parts being omitted; rocker shaft 25, by means of which they are Fig. 5 is a detail section on the line 55 swun upwardly and laterally, thereby pushof F 1g. 4; and ing orward the fuel which rests upon or Fig. 6 is a sectional detail of a ratchet do, has passed them. In order to prevent fuel vice used in the operating mechanism. from dropping tlfrough the apertures in the The fire-box of a locomotive is indicated. bottoms of the channels, within which these at 10, its back head 11 being provided with plates are fitted, each plate is provided at the usual hand firing opening 12. The its swinging end and sides with a depending bottom of the fire-box is provided with a skirt 26. central longitudinal channel 13, from which The pressure exerted upon the fuel by the there lead laterally toward each side wall screw 22 and the screw sections, as 19 and of the fire-box channels, as 14,. 15, their 20, forces the fuel into the lateral channels number being dependent upon the len h in such quantity as to cause it to overflow of the fire-box. The portions of the reupon the grate surfaces 16, and the advancbox. bottom, intermediate of the lateral ohaning ressure exerted by the plates 24 has a

nels

14, 15, are grated, as represented at 16, simi ar effect The lateral channels serve and upon them the combustion of the fuel the additional function of coking retorts, is mainly accomplished. The side walls of so that when the fuel reaches the

grate surthe channels

14, 15, may be and preferabl faces its volatile content has been largely are provided with a series of air oms}; eva orated. The combustion commences ad'acent their upper margins. within the channels, due to the air entering lthin the channel 13. there is located a through the ports 17, and is completed 11 on shaft 18, car ing a conveying screw or the grated surfaces. Any ash which oes spiral vane which 1s preferably interrupted, not escape through the grates gravitates to of it will find its way into the first pair I retained by the valve 28 a su cient time to cause its complete combustion, air ports 29 being provided in one wall of the passage 27. above the valve.

The shaft 18 is. rotated from a prime mover, conventionally shown at 30, the means provided for transmitting power -from this motor to the shaft being shown as ,wheel 48, driving the chain 31 thro a sprocket chain 31. The motor is preferably of the oscillating type,'and power is transmitted from its shaft 47 to the sprockelt ratchet and pawl mechanism 49, shown in Fig. 6.

The shafts, as 32, carrying the ash-dis-.

charging valves are rotated by a step by step movement by means of a ratchet wheel 33, mounted upon each, with which there cooperates a pawl 34, given an oscillating movement through the medium of a link bar 35, connected with a rocker arm 36 having a slot 37, within which works a wrist pin 38 carried by the sprocket wheel 39 on the shaft 18. The two links 35, one for each valve, are

adjustably secured to the rocker arm 36, thereby providing for variations in the throw of the pawls 34, and consequently of the rate at which the valves are turned. The shafts 25 are rocked by any suitable means, there being conventionally shown for this purpose as connected to each through one of the cranks 42 and a connecting-rod a reciprocating motor 40, rocking a shaft 41, which is connected to the shaft 25 b means of cranks 42 mounted on the sha 41, and connected by means of links with crank arms 42 mounted on the shaft 25.

The screw 22 -may be driven from any suitable source of power, preferably derived from the prime mover 30. To this end thereis shown a shaft 43, connected to the prime mover by means of ratchet and pawl mechanism housed within a casing 45, and which may be controlled in any well known manner, as by means of a lever 46. The shaft 43 may be suitably connected with the rearward end of the screw 22. This driving mechanism is common in locomotive stokers, and forming no part of the present invention is not fully illustrated.

While I have shown an operative structure, the invention may be embodied in different forms and I do not, therefore, desire to be limited to the details as herein shown and described.

I claim as my invention- 1'. In an underfeed stoking device, in com bination, a fire-box bottom inclined downward from its middle portion toward each side thereof and having a central longitudinal the central channel, the portions of such bottom intermediate of the lateral channels being grated meansfor advancing fuel in the central 0 annel, and means for advancing fuel in the lateral channels.

3. In a stoking device, in combination, a firebox bottom inclined downward from its central portion toward each side thereof and being provided with a central longitudinal channel, lateral channels leading outwardly from the central channel, the bottoms of the lateral channels inclining downward from the central channels, and having ash-discharge opening at the outer ends of said lateral channels, the portions of the bottom intermediate of the lateral channels being grated, and means for advancing fuel through the central channel and causing its discharge into the lateral channels.

4. In an underfeed stoking device, in combination, a fire-box bottom inclined downward from its middle portion toward each side thereof and having a central longitudinal channel and lateral channels leading outwardly therefrom, the bottoms of the lateral channels inclining downward from the central channel, the portions of such bottom intermediate of the lateral; channels being grated, and a screw conveyor within the central channel.

5. In an underfeed stoking device, in combination, a fire-box bottom inclined downward from its middle portion toward each side thereof and having a central longitudinal channel and lateral channels leadmg outwardl therefrom, the bottoms of the lateral c annels. inclining downward from the central channel, the portions of such bottom intermediate of the lateral channels being grated, and a shaft within the central channel having an interrupted screw vane.

6. In a stoking device, in combination, a fire-box bottom inclined downward from its central portion toward each side thereof and bein provided with a central longitudinal c annel, lateral channels leadin outwardly from the central channel an having ash-discharge openings at the outer ends of said, lateral channels, the bottoms of the lateral channels inclining downward nausea the lateral channels inclining downward from the central channel, the portions of such bottom intermediate of the lateral channels being grated and the side walls of the lateral channels having air ports, and means for advancing fuel in the central channel. 1

8. In an underfeed stoker, in combination, a fire-box bottom having a central longitudinal channel and lateral channels leading therefrom, the bottoms of the lateral channels inclining downward from the central channel, and means for forcing fuel throu h the central channel.

9. 11 an underfeed stoker, in'combination, a fire-box bottom having a central longitudinal channel and lateral channels leading therefrom, the bottoms of the lateral channels inclining downward from the central channel, the portions of the bottom between the lateral channels being grated, and means for forcing fuel through the central channel.

10. In an underfeed stoker, in combination, a fire-box bottom havin a central longitudinal channel and latera channels leading therefrom, the bottoms of the lateral channels inclining downward from the central channel, the side walls of the lateral channels being provided with air ports, and means for forcmg fuel through the central channel.

11. In an underfeed stoker, in combination, a fire-box bottom having a central longitudinal channel and lateral channels leading therefrom, the bottoms of the lateral channels inclining downward from the central channel, such bottom being provided with ash-discharge openings at its s1de margins, and means for forcing fuel through the central channel.

12. In an underfeed stoker, in combination, a fire-box bottom having a central lonitudinal channel and lateral channels leadmg therefrom, the bottoms of the lateral channels inclining downward from the central channel, such bottom being provided with valve-controlled ash-discharge openings at its side mar ins, and means for forcing fuel through t e central channel.

13. In an underfeed stoker, in combination, a fire-box bottom having a central longitudinal channel and lateral channels leading therefrom, the bottoms of the lateral channels inclining downward from the central channel, a feed conduit deliverin to the 'rearward end of the central channe andv means for forcing fuel through such conduit.

14. In an underfeed stoker, in combination, a fire-box bottom having a central Ion-- itudinal channel and lateral channels leadmg therefrom, the bottoms of the lateral channels inclinin downward from the central channel, a eed conduit delivering to the rearward end of the central channel, means for forcing fuel through such conduit, and means for advancing fuel in the lateral channels. a

15. In an underfeed stoker, in combination, a fire-box bottom having a central longitudinal channel and lateral channels leading therefrom, the bottoms of the lateral channels inclinin downward from the central channel, a eed conduit delivering to the forward end of the central channel, means for forcin fuel through such conduit, an oscillata le plate in each lateral channel for advancing fuel therein, and

means for actuating such plates.

16. In an underfeed stoker, in combination, a fire-box bottom having a central channel and lateral channels leading therefrom, a rotative shaft located longitudinally within the central channel, and a series of screw flights mounted on the shaft and between the lateral channels.

17. In an underfeed stoker, in combination, a fire-box bottom having a central channel extending longitudinally thereof and lateral channels in communication with said central channel, said lateral channels extending outwardly and forwardly from said main channel, and means for forcing fuel along said central channel.

18. In an underfeed stoker, in combina-, tion, a fire-box bottom having a central channel and lateral channels leading there from, said central channel inclined downward from the rear to the front of said fire-box, and means for forcing coal along a said central channel.

NATHAN M. LOWER.