US2286844A - Coal supplying mechanism for stokers - Google Patents

Description

June 16, 1942. H. c. CARTER 2,286,844

GOAL SUPPLYING MECHANISM FOR STOKERS Filed Sept. 13, 193'? 2 Sheets-Sheet@ Ow L /NME/v TDR H. .CARTER E /4' TTURNE s/ June 16, 1942. CARTER 2,286,844`

COAL SUPPLYING MECHANISM FOR STOK'ERS l Filed sept. r13, 1937 2 sheets+snee 2 H` C.. CARTER Patented June 16, 1942 G IVIECHANISM FOR COAL SUPPLYIN STO Haskell o.' carter, Peruana, ereg., assignerv te Iron Fireman Manufacturing Company, Portland, Oreg. v

Application September 13, 1937, Serial No. 163,595

s, claims. (ci. 25e- 4.6)

VrIhis invention relatesv generally to coalstokers, and particularly ,to a coal supplying mechanism therefor.

The main object of this invention is' the construction of a stoker and a coal supplying mechanism therefor by means of which coal may be drawn from a bin.

The second object is to construct a coal supplying mechanism especially adapted for use in stokers in which themain driving mechanism isdisposed between the; point of coal storage and the point of combustion.

I accomplish these and other objects in the manner setl forth in the followingfspecieation as illustrated in the accompanying drawings, in

which:

Fig. 1 is a perspective view of a stoker equippedv v Fig. 1.

Y with my device showing -a part of the coal bin Fig. 3 is a horizontal section through the coal feeding worm with parts thereof in section.

Fig. 4 is a section taken along the line II-Il-in Fig. 3.

. Fig. 5 is a section taken along the line 5-5 in Fig. 1.

Similar numerals refer to similar parts throughout the several views.

Referring in detail to the drawings, there is shown a retort I0 into whose base II extends the broken` away air duct I2 and the coal tube I3. Air is supplied to the duct I2 by means of the fan I4 which is driven by a motorv I5. Theshaft I6 of the motor I5 is providedwith a stepped-pulley I1 which is in alinement with a similar pulley I8 of the transnected by means of a chain 33. 'I'he sprocket wheel 32 is mounted on the shaft 34 of the'coal feeding-worm 25 which journals in the standard The sprocket wheel 3I isfmounted on the shaft 35 which journals in the standard 30 and is driven through the square coupling pin 36 from the transmission I9.

In order to prevent the coal from arching in the bin 23, vI have provided the agitatorwheels 31 which are pivotally mounted on the bearings 38 which are supported b'y the brackets 39 which rise from the .base 29. The agitator wheels 31 mesh with the coal feeding worm 25 and the rotation thereof causes the wheels 31 :to rotate and thereby prevent archingof the coal.

It is desirable in some instances to provide a yieldable agitating arm 4I! on the shaft 35 in front of the agitator wheels 31. In -other instances, it may bev desirable to provide more of the wheels 31 or more of the arms 40.'

'I'he operation of. that portion of the device the shaft 35 istransmitted through the sprocket wheels 3| and 32 to the same shaft 34 therebyv causing the coal feeding worm 25 to rotate and conveycoal from the .bin 23 to the retort I0.

In order that this invention may be more clearly understood, vit is explained that 'in the common type of coal stokers, coal is placed in a relatively small hopper and this fhopperis disposed b'emission I9. A '.belt IB-A connects the pulleys I1 and I8. A casing 20 encloses the fan I4, the

motor I5 and the transmission I9.

The tube I3 extends from the base II .to the clean-out box'il whichis secured to the plate z2 of the coal bin is whoseboaom Sides 24 slope vdownwardly toward the coal feeding worm 25 which extends from the retort I0 to the rear wall 26 of the coal bin 23. The front wall 21 of the coal bin .23 may be close to the casing 20 if desired. The sidezwalls 28 may form a portion of the wall of the building in which the stoker is placed or may be separately made as desired.

' Referring more particularly to my invention, it

will be noted that there extends from the casing 20 a horizontal base 29 uponwhose outermost end is mounted a standard 30 which is a housing for the sprocket wheels 3| and 32 which are conare not-specifically described herein;

tween the retort and the drive mechanism. The

small hopper must of course be lled as often-as it is lempty which is objectionable from the standpoint of automatic heat requirements. By the use of my device, it is possible to draw coal directly from the bin without the necessity of repeatedly filling the small hopper.

It must be understood that while Ihave illustrated the shaft 35 as being directly above the coal feeding wor-m 25, it may also be placed in other relative positions/without departing from the spirit of this invention.'

Stoker details which have no bearingon the present invention but which have been illustrated I claim:

l. In a stoker, a hopper consisting of an elongated,'horizontal base having standards at opposite ends thereof, 'a` coal feeding Worm disposed above said base, a horizontal drive shaft disposed above said worm and baseandin the sa'me plane T. {oFFic` at the end'thereof farthest from the delivery end of said worm, and a hopper casing independently enclosing said base.

2. In a stoker, a hopper consisting of an elongated, inverted, horizontal channel constituting the hopper base, an upright standard mounted at one end of said base, a coal worm having its driving end journaling in said standard, a drive shaft having its driven end journaling in said standard, means for drivably connecting the driven end of said shaft with the driving end of said worin, a V shaped bracket mounted on said base, each end of said bracket having an agitator sprocket wheel mounted thereon and meshing with said worm, the two wheels forming a V shaped saddle directly under said drive shaft and a hopper casing enclosing said sprocket wheels and coal worm independently of said agitating wheels.

HASKELL C. CARTER.

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