US1267298A - Furnace-door attachment. - Google Patents

Description

L. D. WEST.

FURNACE DOOR ATTACHMENT.

' APPLICATION FILED JUNE 29.1917. 1,267,298.

Patented May 21, 1918.

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FURNACE DOOR ATTACHMENT.

APPLICATION FILED JUNE 29, 1917.

1,267,.Q98. Patented May 21, 1918.

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FURNACE-DOOR ATTACHMENT.

Specification of Letters Patent.

Patented May 21, 1918.

Application filed June 29, 1917. Serial No. 177,822.

Toallwhom it may concern:

Be it known that I, Lnonroxs D. WVEST, a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in Furnace-Door Attachments; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to improvements in smoke consuming and fuel saving devices. It is well known that when a fresh supply of coal is spread over the fuel bed in a stove or furnace, it is heated to ap proximately two thousand degrees within two or three minutes. This rapidly distils the gases which constitute anywhere from fifteen per cent. to forty per cent. of the coal and this distillation occurs whether air is admitted or not, but to consume these gases requires both air and ignition heat as well as thorough intermixture with gases in the fire box. If either is lacking, there will be a great quantity of smoke created.

Coal, wood, oil'or any combustible matter can be consumed in the open air with unlimited oxygen and yet produce an unmense volume of smoke. It is evident, therefore, that the problem of abating smoke supply of oxygen in proper prothe right periods, at proper ignition temperature, and at the correct point or points to produce instant and thorough intermixture of the oxygen and gases, before the latter escape from the combustion chamber. My invention has for its object to meet these requirements,

1. By the opening of an air inlet valve when the fireman opens the coal door, so that he cannot forget to feed the extra quantity of'air which is necessary immediately after coaling to assist in burning the gases.

2. By the provision of an air pro-heating device through which the incoming air passes before it is discharged into the fire box.

3. By the utilization of the usual space between the coaling door and the perforated flame buffer for a secondary air heating chamber and,

4. By constructing the device to render it adaptable for use in connection with other air heating devices.

portion, at

7 With the foregoing general objects in view, the invention resides in the novel features of construction and unique combination of parts to be hereinafter fully described and claimed, the descriptive matter being supplemented by the accompanying drawings which form a part of this specification and in which:

Figure 1 is a front elevation of a portion of a furnace showing the application of the invention to the coaling door thereof.

Fig. 2 is a vertical section showing an edge elevation of the parts depicted in Fig. 1.

Fig. 3 is a vertical section on the plane of the line 3-3 of Fig. 1.

Fig. l is a view similar to Fig. 2 showing the supplemental air inlet in open position.

Figs. 5 and 6 are vertical sections on the planes indicated by the lines 5-5 and 6-6 respectively of Fig. 3.

' In the drawings above briefly described, the numeral 1 designates a portion of a furnace which is equipped with the usual door opening 2 and coaling door 3. The door 3 is provided with a common type of perforated flame buffer spaced therefrom by sleeves 5 through which screws or the like 6 pass, this being common construction. One feature of the present invention, however, consists in closing the space between thebufier and the door, along the vertical and the top edges of the former, this being accomplished by the provision of a frame 7 of arch shape extending around and supported by the sleeves 6 as illustrated clearly in Fig. 6. In some instances the frame 7 could well be constructed of one piece but in most cases it will be formed of a pair of inverted L-shaped bars 8 whose horizontal arms overlap each other and are secured to gether by a bolt or the like 9.

By the provision of the frame 7 the space between the buffer 4: and the door 3 constitutes an air heating chamber into which a quantity of air is admitted by the opening of a damper 10, when the handle 11 of the door is actuated to open said door. The air, after being heated in the chamber in question, and in another pre-heating chamber to be described, is discharged from the perforations of the buffer 4 in a plurality of jets which insure thorough mixing thereof with the hot gases in the fire box. A thin sheet of the heated air is simultaneously discharged at the lower end of the buffer, between said end and the door 2. This heated air mingling with that supplied by the other air heating means yet to be described, produces perfect combustion even immediately after coaling and thus prevents excessive smoking, by prompt and thorough burning of the gases.

The damper plate 10 above referred to is pivoted at 12 t the upper end of an air heating casing 13 which is either formed integrally with or otherwise secured to the outside of the door 3, the outer end of said casing having an air inlet which is normally closed by said damper plate, said inlet, however, serving to admit air to perforations let in the door 3, when said plate is opened.

The air passes not only directly through the upper portion of the casing and through the perforations 14, but heated air is displaced from the lower portion 15 of said casing, and this rising air causes a quantity of the incoming air to pass downwardly into the chamber 15 so that such air is more or less pro-heated. The heating efficiency of the chamber 15 is increased by the provision of a suitable web 16 positioned therein and contacting with the door 3 so that heat is I absorbed from the latter, the web in question being preferably though not necessarily of the Y-shape illustrated in Fig. 5, whereby the ascending air will be forced to impinge upon the horizontal arms of the web as well as upon the sides of the casing.

These ribs support and brace the center of the casing 13 to prevent its breakage.

For the purpose of opening the damper plate 10 when the handle 11 is operated to open the door 3, any suitable connections could well be employed. F or illustration purposes, however, I have shown a link 17 which may be pivoted at its upper end to.

either of a pair of cars 18 which project outwardly from the damper, the link being pivoted to one car when the handle 11 is positioned at one edge of the door, while it is necessary to connect said link with the other ear when the handle is located at the opposite edge of the door. The lower end of link 17 is pivoted to a latch 19 which is in turn pivoted at 20 to the door or to a plate 21 which may be secured to said door, said latch cooperating with a hook-shaped cam 22 which may be formed integrally with or otherwise secured to the handle 11, the, latter being pivoted to the door or to plate 21 as indicated at 23. In the present SllOWll'lg, the latch 11 is mounted for vertical swinging but it will be understood that it could well move horizontally and in some case's it might well have a sliding rather than a pivotal motion, such details lying clearly within the scope of the invention.

The device constructed as or substantially as so far described may be operated independently of any other air heating means if required but in most cases it will be employed in conjunction with a suitable air heating casing 24 mounted on the door 3 and spaced slightly in rear thereof, saidcasing having upper and lower air spraying devices 25 and 26, whose construction constitutes no part of the present invention,

beingincorporated in my copending U. S.

application, Serial No. 174319, filed on or about June 12, 1917. The casing 24; is equipped with a pair of air supply pipes 27 which pass through the buffer 4, through the door 3, and through the lower portion of the casing 13, the inner ends of said pipes having nuts or other suitable stops 28, contacting with the buffer 1, whereas sleeves or the like 29 are threaded on the outer ends of said pipes in contact with the casing 13. This arrangement of pipes 27 causes them to not only support the casing 24: and serve as air supplying means therefor but effectively clamps the casing 13 in place without the necessity of employing other fastening means. On account of these advantages therefore, the specific features of construction in question are by preference employed although it is to be understood that other suitable means could well be provided for carrying out the same ends.

The specific operation of the parts 2 1, 25

and 26 is set forth in the application above referred to and it need therefore be only stated here, that these devices serve to sup ply heated air at different temperatures to the fire box to set up a circulation therein, which circulation insures thorough mixing of the air with the hot gases, so that combustion is greatly augmented. The hot air supplied from the spraying device 25 and 26 mixes with the heated air which is discharged from the perforated buffer a when the damper plate 10 is opened, the compounding or mixing of all of this air with the hot gases and smoke in the fire box, serving to cause practically perfect combustion so that the furnace will not smoke excessively even after a fresh quantity of coal has been supplied. v

Particular emphasis is laid upon the fact that the damper 10 is opened when the handie 11 is actuated to open the-door, it being thus insured that the fireman shall not neglect to supply the needed'quantity of extra air after supplying the coal. It is also to be observed that the damper 10 is held in open position by the cam 22 and the latch 19 as shown in Fig. at. By thisarrangement, the damper may be held open any suitable length of time and then closed, byv tripping the latch but as aboveset forth, thereis no danger whatever of the fireman failing to open the same since opening of the door opens said damper.

Another feature worthy. of note is the frame 7, since the use of-this frame converts the space between the usual buffer and coaling door into an air heating chamber. It is to be understood, however, that on furnaces in which the buffer extends entirely to the edges of the door, the frame 7 need not be employed. This rarely occurs, however, in comparatively large furnaces.

Yet another feature upon which particular emphasis is laid, is the pre-heating chamber 15 in the lower portion of the casing 13, for the purpose of heating the incoming air to a slight extent before it is admitted into the heating chamber between the door and the buffer.

On account of the several advantages of the specific features of construction above described and illustrated in the drawing, these features constitute the preferred form of the improved device. I wish it understood, however, that within the scope of the invention as claimed, numerous minor changes may Well be made.

No claim is herein made to the construction of the parts 2 1, 25 and 26 as they form the subject matter of another application, Serial No. 174,319, filed June 12, 1917. There is nevertheless an important coaction be tween these parts and the pivoted damper 10, since the heater 24 continuously supplies hot air to the fire box to insure proper oombustion while the door remains closed, and the damper 1O augments the action of said heater immediately after coaling.

I claim:

1. The combination with a furnace coaling door havin an air inlet for admitting air into the firebox after coaling, of a damper pivoted on said door for controlling the entrance of air through said inlet, a handle pivoted to the door and extending forwardly therefrom for opening said door, and operating connections between said damper and said handle for opening the former from the latter and holding it open when said handle is operated to open said door.

The combination with the coaling door of a furnace, said door having a movable handle and also having an air inlet, of means on the door for controlling admission of air into the furnace through said inlet, a combined latch and operating member connected operatively with said air controlling means, and means on said handle for actuating said Copies of this patent may be obtained for five cents each, by addressing the ing-additional air "for controlling said member to open said air controlling means when said handle is actuated to open the door and for coaction with said member in holding said air controlling means in open position.

3. The combination with the coaling door of a furnace, said door havin a movable handle and also having an air in ct, of means on the door for controlling admission of air into the furnace through said inlet, a combined latch and operating member connected operatively with said air controlling means, and a cam on said handle for actuatlng said member to open said air controlling means when said handle is actuated to open the door, and for coaction with said member in holding said air controlling means in open position.

4:. The combination with a furnace coaling door having an air inlet for admitting air immediately after coaling, of a damper pivoted to said door for controlling the entrance of air through said inlet, a vertically swinging handle member pivoted to the door below said damper for opening said door, said handle member having a cam, a latch member pivoted to the door above said handle member and having a shoulder, the raising of said handle member serving to cause said cam to correspondingly raise said latch member, and a link pivoted to said damper at one end and pivoted at its other end to one of said members for opening said damper when said handle member is actuated to open the door, said cam and said shoulder coacting in holding said link in raised position.

5. The combination with a furnace coaling door, of an air heater carried thereby for continuously supplying hot air to the firebox, an inlet through said door for supplyafter coaling, a damper inlet, a movable handle for opening said door, and operating connections between said handle and said damper for opening the latter from the former and holding it open when said handle is actuated to open the door.

In testimony whereof I have hereunto set my hand.

LEONIDAS D. WEST.

Commissioner of Yatents,

Washington, D. G.

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