US1936962A - Automatic stoker - Google Patents

Description

Nov. 28, 1933.

F. CH'AMBERLIN AUTOMATIC STOKER Filed April 21, 1932 flor/nego.

Patented Nov. 28, 1933 PATENT OFFICE- AUTOMATIC STOKER Forest Chamberlin, Painesville, Ohio Application April 21, 1932. Serial No. 606,745

1 Claim.

This invention relates to an automatic stdker designed primarily for use in connection with furnaces forming va part of heating plants of dwellings, small shops or the like.

An important object of the invention is the provision of a stoker including a reciprocating feeder onto which the coal is deposited and carried forwardly, a small portion of the fuel, or

that fuel at the forward end of the stolrer,`

being pushed into the fire box of the furnace, thereby reducing the power necessary for the operation of the feeder to a minimum, and eliminating the objectionable stoker which requires a maximum power, when feeders of the pusher type are employed in pushing the entire contents of the feeder tube of the stoker, in feeding the coal to the furnace.

A further object of the invention is to provide a feeder of a novel construction which will insure against the coal clogging in the feeder tube, of the apparatus as the feeder reciprocates in operation.

A still further object of the invention is to provide a stoker which will be thermostatically controlled, thereby insuring an even temperature within the building heated by the furnace equipped with a stroker constructed in accordance with the invention.

Withthe foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

Referring to the drawing:

Figure 1 is a longitudinal sectional view through a stoker constructed in accordance with the invention.

Figure 2 is a horizontal sectional view through the stoker.

Figure 3 is a sectional view taken online 3-3 of Figure 1.

Figure 4 is a sectional detail view illustrating the construction of the agitator used in the discharge pipe of the hopper,

Throughout the specification, the term forward is used meaning the direction in which the fuel is fed.

Referring to the drawing in detail, the Stoker comprises a housing or body portion 5, which embodies preferably an upper section 6 and a lower section 7, the sections being connected by means of the bolts 8.

Due to this construction, it will be seen that the body portion may be readily and easily opened permitting of ready access to the gearing supported within the housing 5.

Legs 9 are provided on the housing 5, to which legs wheels 10 are connected, so that the device may be readily moved in position at the front of the furnace.

The forward end of the housing 5 is formed with a threaded opening into which one end of the feeder tube 11 extends, the feeder tube being of a length to extend an appreciable distance within the furnace, the free end thereof lying directly over the coals of the fire bed.

Supported above the feeder tube is a hopper 12, which is, in communication with the feeder tube 11, through the discharge pipe 13 that is shown as extending into the feeder tube, through an opening formed in the wall of the feeder tube.

The wall of the discharge pipe 13 is formed with a slot, through which the pins 14 of the agitating bar 15 extend, the agitating bar 15 being slidably mounted in a guide 16 located directly'under the slot.

Extending from the .bar 15, is an ear 17, which ear is supplied with a transversely disposed pin 18 that is engaged by the forked end of the arm 19 which is pivotally mounted on the bearing 2O that is in turn supported on the partition 21, located in spaced relation with the forward end of the housing 5.

The space between the partition 21 and forward end of the housing 5, provides a blower chamber 22, the chamber 22 being in communication with the atmosphere, through the opening 23 formed in the upper wall of the housing.

A shaft 24 extends through the blower chamber, and provides the support for the blowers 25, which are shown as spaced apart. The space between the blowers is provided so that d ust or other foreign matterthat may be drawn into the blower chamber, from the feeder tube 11, may be forced from the blower chamber, by the blowers 25.

Pipes 26 extend from the blower housings, l'

by the jacket 29. which is shown as positioned around the feeder tube. Due to this construction, a portion of the blast of air may be shunted into the space 28' to maintain the feeder tube in a cool condition at all times.

The outer end of the jacket 29 is formed with an inwardly .extended annular ange that contacts with the feedertube closing the end of the space 28. Openings 10 are formed in the flange, to allow air to pass from the space 28.

The reference character 30 designates a crank shaft which is mounted within the housing and operated by means of the gear 31 which is mounted near one end of the crank shaft. Power is transmitted to the gear 31, byk the shaft 32, through the pinion 33 mounted on the shaft 32. Secured near one end of the shaft 32 is `a gear 34 that meshes with the pinion 35 secured to the shaft 36. V

This shaft 36 is of a `length to extend beyond the side wall of the housing 5, where it is supplied with pulleys 37 and 38 respectively. v

The power shaft which is indicatedby-the ref erence character 39 may be operated by any suitable source of power, however it is contemplated to employ an electric motor for supplying the power, so that a thermostat may be used in controlling theoperation of the power shaft.

A pulley 40 is mounted on the power shaft and transmits movement to the pulley 38, through the medium of the belt 41. The shaft 24 on which the blowers 25 are mouuted, has one of its ends extended beyond the side wall of the housformed in the partition 21, the inner end of the rod 49 being pivotally connected with the link 50,

vthat in turn connects with the crank 51 of the fthe draft through the pipe 28.

ing 5, where it is supplied with a pulley 42, which receives motion fromthe pulley 37, through the belt 43. y

Thus it will be seen that due to this construction the crank shaft 30 and blower shaft 24 are operated from the same power shaft so that they will operate simultaneously.

Secured to the shaft 30, is a cam 44 which operates in an elongated opening formed in the inner end of the arm 19, with the result that as the shaft 30 rotates, the arm 19 pivots on the bearingI 20, resulting in a reciprocating movement of the agitating bar to cause the coal vto be fed through the discharge pipe without danger of the coal clogging.

The feeder bar, which is indicated by the reference character 45 is of novel construction, and plays an important part in the operation of the st'oker, and as shown the feeder bar is formed with a curved lower surface conforming to the curvature of the feeder tube 11, while the upper surface thereof is fiat and of stepped formation, defining shoulders 46 and 47 respectively.

In order that the feeder bar 45 will be held in a position to insure a true horizontal movement Secured to the inner end of the feeder bar, is a rod 49 that operates through an opening In order that the various gears and pinions of the device may be properly lubricated, the lower section of the housing 5 is so constructed that it provides an oil casing so that the gears and pinions operate in oil.

A brace bar 53 extends from the upper surface of the housing 5 and connects with the hopper 12 for providing a support for the hopper.

The operationof the device isasfollows: Coal is deposited in the hopper 12, from where the coal feeds by-gravity through the discharge pipe 13, and falls onto the upper surface of the feeder bar, between the shoulders 46 and`47.

As the feeder bar moves rearward, the material passes over the shoulder 46 and falls onto the forward end of the feeder bar from where it drops into the feeder tube, and is pushed into the furnace, with the next movement of the feeder bar.

Due to this construction, the major portion of the weight of the material is carried by the feeder bar, to the end that a motor of a minimum horse power may be used in operating the device, and since only a small quantity of coal is pushed through the feeder tube at each stroke of the feeder bar, a free operation of the feeder bar is insured at all times.

It will of course be understood that the blowers operate to create a draft of ,air which circulates around the feeder tubey 11, cooling the feeder tube.

The blowers also create a draft in the furnace .to insure the burning of the coal.

Having thus described the invention what is claimed is:

A stoker comprising a housing, a vertical partition within the housing and spaced from the front wall thereof, providing a blower housing, a fuel feeding tube extending from the forward end of the housing and communicating with the blower housing, a reciprocating feeding bar operating Within the fuel feeding tube, spaced blowers mounted within the blower housing and having open inner ends to permit materialto pass into the blowers from the outer end of the fuel feeding tube, and having discharge passages, a passage communicating with said discharge passages, an air jacket surrounding the fuel feeding tube, spaced therefrom and provided with discharge openings near the discharge end of the feeding tube, and a passage leading from the last named passage to the air jacket, means for operating the feeding bar, and means for feeding material to the fuel vfeeding tube.

FOREST CHANIBERLIN.

Images