US1149416A - Driving mechanism for stoker-boxes. - Google Patents

Description

B. C. STEWART. DRIVING MECHANISM FOR STOK ER BOXES.

APPLICATION FILED JAN. 16, 1914.

Patented Aug. 10, 1915.

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1,149,416, Patented Aug. 10, 1915.

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. UNTTEED STATES PATENT QFFTCE.

BURT C. STEWART, OF DETROIT, MICHIGAN, ASSIGNOR TO MURPHY IRON WORKS, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

DRIVING MECHANISM FOR STOKER-BOXES.

Specification of Letters Patent.

Application filed January 16, 1914. Serial No. 812,564.

nism for stokers, and more particularly to a variable speed drive for stoker boxes, which permits of the stoker boxes at one end of a furnace being moved at a different speed from the stoker boxes at the other end of the furnace.

It is a well known fact that fuel is consumed with greater rapidity at the rear end ofa combustion chamber or fire box than at the forward end thereof, consequently it is necessary to operate the stoker boxes at the rear end of a furnace more often than at the forward end, whereby a greater amount of fuel will be automatically fed into the furnace. To permit of the stoker boxes at the rear end of the furnace being automatically operated independently of the stoker boxes at the forward end of a furnace, I have devised a driving mechanism which permits of either set of stoker boxes being thrown out of operation or permits of either set being manually actuated independent of the .automatic drive. l

The driving mechanism will be herein after specifically described and then claimed, and reference will now be had tothe drawings, wherein Figure 1 is a front elevation of a furnace provided with'a driving mechanism for the stoker boxes thereof; Fig. 2 is an enlarged longitudinal sectional view of a portion of the driving mechanism; Fig. 3 is a front elevation of the same partly brdken away and partly in section, and Fig. 4 is a plan of a portion of the driving mechanism. In describing my invention by aid of the drawings above referred to I desire to point out that I intend said views as merely illustrative of an examplewhereby my invention may be applied in practice, and I do notlimit my claims to the precise arrangement and construction. of. parts indicated. The following description is therefore to be construed broadly as including substitute arrangements and constructions which are the obvious equivalent of those shown.

Patented Aug. 10, 1915.

In the drawing, 1 denotes the front wall of the furnace of that type commonly known as the side over feed, wherein inclined stationary and movable grate bars 2 receive fuel from coking plates 3 and fuel magazines 4, the fuel being automatically fed by stoker boxes 5. The stoker boxes '5 are provided with racks 6 and engaging said racks are segment gears 7 and 8, the former being mounted upon'a sleeve 9 and the latter upon a shaft 10, said sleeve and said shaft extending through the front wall 1 ofthe furnace. The shaft 10 protrudes beyond the end of the sleeve 9 and is provided with a rectangular shank 11 upon which there is mounted a circular head 12. The head 12 has the periphery thereof provided with a notch 13 and the front side of said head has a neck 14 and a rectangular shank 15, said hub portion 18 of a lever 19 and said hub portion has a radially disposed bearing 20, the purpose'of which will presently appear. Mounted upon the outer end of the sleeve 9 and confronting the head 12 is a head 21 having the periphery thereof provided with a notch 22. The head 21 also has a neck 23 an-dloosely mounted upon said neckis the- 20 of the lever 19. The bearings 20 and 26 r a:

are connected by a bolt 27 and a nut 28, said boltserving as a pivot pin for dogs 29 and 30 adapted to engage in the notches 13' and 22 respectively.

The periphery of the head 21 is provided with a seriesof teeth or a rack 31 and meshing with said rack is a gear 32 rotatably mounted upon a stud shaft or pin 33, supported byv the front wall 1 of the furnace. The sector gear 32 has a rectangular shank 34:, the purpose of which will hereinafter appear. v

The lower ends of the levers 19 and 25 are longitudinally slotted, as at 35 and connected by an adjustable bolt 36, which has the threaded end thereof provided with a nut 37 having a handle or crank 38 that permits of the bolt 36 being rapidly adjusted relatively to the levers 19 and 25. Arranged upon the bolt 36, between the levers 19 and 25 is a rotatable spacing sleeve 39 and engaging said sleeve is the hook-shaped end of a link 40 pivotally connected, as at 11 to.

the end of a connecting bar 42. The connecting bar 42 is slidably mounted in brackets 01* straps 43carried by the front wall of the furnace and said connecting bar permits of the stoker boxes atone side of the furnace being operated in unison With the stoker boxes at the opposite side thereof.

Associated with the connecting bar 42 are connections generally designated 44, these connections being of the ordinary and well known type employed for; operating the movable grate bars and the clinker grinder of the furnace.

-' bar 42. a

When the connecting bar 42 is recipro- Arranged at one side of the furnace is an engine or motor driven shaft having one of. the driven wheels 16 thereof provided with a wrist pin 47. This wrist pin sup ports one end of a'pitman. 48 that is pivotally connected, as at 49 to the connecting cated, an oscillatory movement is imparted to the levers 19 and 25, and with the dogs 29 and 30 inengagement with the heads 12 and, 21, the sleeve 9 and the shaft 10 are rocked to impart a reciprocatory movement to the stoker-boxes 5 through the medium of the racks 6 and the segment gears 7. z When it is desired to operate one set of stoker boxes that is, the boxes either at the front or rear end of a furnace, one of the dogs 29 or 30 can be thrown out of engagement with one of the heads 12 or 21 whereby the hub portion of one-of the levers is free to moveupon the neckof the head with which it is associated. It is therefore possible to rock thesleeve 9 or the shaft 10 and should it be necessary to manually rock either the sleeve-9 or theshaft 10 a wrench or other suitable instrument can be placed upon either of. the shanks 15 or 34, the latter imparting movement to the sleeve 9 and the former movement to the shaft 10. It is necessary to provide the rack 31 and the and 25 it is necessary From the-foregoing it will be observed spacensleeves 39, and since it is practically.

that the elements 40'to 49 inclusive constitute automatic meansfor imparting moveis through the medium of the above mentioned means that the speed at which'the stoker boxes push the coal into the grates canbe easily regulated to conform with the duty required.

What I claim is z 1. In a driving mechanism for stoker boxes,r the combination with a shaft and sleeve adapted to impart movement to stoker boxes, of means having connection withsaid sleeve and said shaft whereby one can be rocked independently of the other.

2. In a driving mechanism for stoker boxes, the combination with a shaft and sleeve adapted to impart movement to stoker boxes, of means havin connection with said sleeve and said sha t whereby one can be rocked independently of the other, and means ,'to facilitate manually rocking said shaft and said sleeve independently of said means.

3. In a driving mechanism for stokerboxes, a shaft adapted to impart movement to one set of boxes, a sleeve arranged upon said shaft and adapted to impart movement to another set of boxes, confronting heads mounted upon said shaft and said sleeve, and means capable of rocking one head independently of the other'head.

4. In a driving mechanism for stoker boxes, the combination with a shaft and a sleeve adapted to impart movement to stoker boxes, of a head carried by said sleeve, a head carried by said shaft, levers loosely supported by said'head, means adapted to oscillate said levers, said levers relatively to said heads.

5. In a driving mechanism for stoker boxes, the combination with a shaft adapted to impart movement to stoker boxes, a sleeve arranged upon said shaft and adapted to impart movement to stoker boxes, a head and means for fixing fixedupon said sleeve, a head fixed upon said shaft and confronting the head of said sleeve, oscillatory levers loosely supported by said heads and capable of being fixed relatively to either head, and means to fa cilitate manually rocking said head independent of said levers.

6. In a variable speed drive for stoker boxes, a sleeve adapted to impart movement to one set of boxes, a shaft extending through said sleeve and adapted to impart movement to another set of boxes, oscillatory levers loosely supported relatively to said shaft and said sleeve and capable of imparting a rocking movement to said shaft I 'and said sleeve, and means for controlling the operation of said levers relatively to said shaft and said sleeve.

7. In a variable speed drive for stoker boxes, a sleeve adapted to impart movement to one set of boxes, a shaft extending through said sleeve and adapted to impart movement to another set of boxes, oscillatory levers loosely supported relatively to said shaft and said sleeve and capable of im: parting a rocking movement to said shaft and said sleeve, means for controlling the operation of saidlevers relatively to sald of boxes, of a head mounted upon said sleeve,

- a head mounted upon said shaft, oscillatory levers loosely supported by said heads, dogs.

supported by said levers and adapted to be manually thrown into engagement with said heads, and means to facilitate manually rocking said shaft and said sleeve independently of said oscillatory levers.

9.- In a variable speed drive for stoker boxes, the combination with a furnace having stoker boxes, of confronting heads supported at the front. wall of said furnace and adapted to be oscillated to impart movement to the stoker boxes of said furnace, levers supported by said heads, and means for independently fixing said levers relatively to said heads.

10. In a driving mechanism for stoker boxes, the combination with a sleeve adapted to impart movement to one set of stoker boxes, a shaft extending through said sleeve adapted to impart movement to another set of stoker boxes, a head mounted upon said sleeve, a head mounted upon said shaft and provided with a shank, a rack forming part of the head of said sleeve, a sector gear engaging said rack and adapted to facilitate manually rocking said sleeve, oscillatory levers loosely supported by said heads, and.

dogs supported by said levers and capable of being thrown into and out of engagement with said heads whereby either of said heads can be rocked by said levers.

In testimony whereof I afilx my signature in presence of two Witnesses.

BURT o. STEWART.

Witnesses:

LEWIS E. FLANDERs, ANNA M. Donn.

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