US746855A

US746855A - Furnace-door for steam-boilers, &c.

Info

Publication number: US746855A
Application number: US11872402A
Authority: US
Inventors: John Teodor Lindahl
Original assignee: Individual
Current assignee: Individual
Priority date: 1902-08-07
Filing date: 1902-08-07
Publication date: 1903-12-15
Anticipated expiration: 1920-12-15

Description

PATENTED DEG. l5, 1.903.l J. T. LINDAHL. FURNAGE DOOR POR STEAM BOILERS, &o.

APPLIATION FILED AUG. 7, 1802.

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J. T. LINDAHL. PURNAGB DOOR FOR STEAM BoILBBs, am.

APPLIUATION FILED UG. 7, 1902.

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UNITED STATES Patented December 15, 1903.

PATENT OEEICE.

JOHN TEODOR LINDAHL, OF STOCKHOLM, SWEDEN, ASSIGNOR TO CARL ROBERT LAMM, OF STOCKHOLM, SWEDEN.

FU RNACE-DOOR FOR STEAM-BOILERS, 81.0.'

VSPIEIDIIEIGAELION forming part of Letters Patent No. 746,855, dated December 1 5, 1903. Application led August 7. 1902. Serial No. 118.724. (No model.)

T0 all whom it may concern.-

Be it known that I, JOHNVTEODORLINDAHL, a subject of the King of Sweden and Norway, and a resident of Stockholm, Sweden, have invented new and useful Improvements in Furnace-Doors for Steam-Boilers and the Like, of which the following is a specification, reference being had to the drawings accompanying and forming a part hereof.

This invention relates to improvements in furnace-doors for steam-boilers and the like.

.As well known, fu rnace-doors for boilers and the like are usually kept open some minutes each time a new charge of fuel has been brought into the furnace in order to diminish the generation of smoke due to the said introducing of the cold charge of fuel. lf, however, the furnace-door be kept open during a longer time than is necessary-to obviate the generation of smoke, the ring will not be economical, and it is therefore desirous to obtain a furnace-door which may automatically let in the air required for obviating the generation of smoke without being kept open after each introduction of fuel into the furnace.

rlhe object of my presentinvention is,therefore, to provide a furnace-door for boilers and` the like, which by means of a suitable shutter or the like will let in fresh air into-the furnace during a certain predetermined time after the furnace-door has been shut and which will preferably simultaneously heat the said air to a certain degree before it enters the furnace, ak somewhat heated air being, as well known, much better for the purpose in question than cold air.

The invention consists chiey in providing in the furnace-door a suitable shutter so arranged that it will preferably be automatically opened when the furnace-door is opened and be automatically closed a prede-- termined time after the furnace-door has been shut and a suitable heating device for the air let in through the opening of the furnacedoor normally closed by the said shutter.

The invention iinally consists in the arrangements and combinations of parts hereinafter described and claimed.

In the accompanyingr drawings I have shown a suitable constructional form of my present invention.

Figure l shows a front elevation of my improved furnace-door. Fig. 2 is a plan view ofthe same with the shutter in open position. Fig. 3 shows a section on line A B in Fig. l; Fig. 4., a cross-section on an enlarged scale of a-detail, and Fig. 5 a cross-section on line C D in Fig. et.

Like reference-figures indicate the same parts throughout.

Referring to the drawings, the furnacedoor consists of a frame 1, to the inner side :of which may be fixed a number of lamellse 2, preferably made of angle-iron, as illustrated in Fig. 2. The said angle-irons 2 may be held at a suitable distancefrom each other by means of intermediate plates 3 and fixed together by means of screw-bolts el and to jthe said frame 1 by means of angle-irons 2l preferably containing mercury and adapted to close the said shutter 6. The said apparatus consistsof a body l5, Fig. 4, containing two chambers 8 and 9, connected to each other by means of achannel 10, in which is arranged a valve 11, tightening when in the position shown in Fig. 4 against a preferably conical seat 23 in the bottom of the upper chamber 8. The said valve 11 may be provided with a small channel (or channels) 13, through which the mercury will slowly flow from the chamber 8 into the chamber 9 when the former stands on a higher level than the latter. To the top of the said Valve ll may be xed a pin 14 or the like of such length that :it will strike the insideuof the outer end of the chamber 8 or a screw 24, closing the said said valve 11 may for this purpose preferably be of triangularcross-section, as illustrated in Fig. 5. The outer end of the chamber 9 may also be closed by a screw 25. Between the said chambers 8 and 9 and preferably somewhat at the side of the middle of the apparatus is provided a nave 26 or the like by means of which the apparatus is adapted to be fixed to the said axle 7, which preferably runs in ball-bearings, so as to be easily-turned. On the pivot 16 of the furnace-door may be attached a hook 17, the outer part of which preferably is bent on a Icircular arc and at the same time forms an inclined guide. The said hook 17 is further so arranged that when the furnace-door is opened it will engage with the lower part of the said apparatus 15 and turn the latter from the position shown by full lines in Fig. 3 into the position shown by dotted lines in the same figure, so that the chamber 9 will come above the chamber 8, the valve 11 thereby leaving its seat 23, so that the mercury in the chamber 9 can rapidly dow into the chamber 8. At the same time the shutter 6, being fixed to the same axle 7 as the apparatus 15, will be opened and will be kept in open position by the mercury in the chamber 8 when the fire door is thereupon shut. In order to enable the shutter 6 to be automatically closed by the said apparatus 15, I provide a turnable arm 18 or the like suitably attached to the one end of the casing 5 and provided at its outer end with a weight 19', preferably in the form of a roller or the like. The said weight bears normally against the one of the bearings 20 of the said axle 7, but will be lifted by the shutter 6 when the same, while the furnacedoor is being opened, is turned into the said position shown by dotted lines in Fig. 3. When the furnace-door is thereupon closed, the hook 17 does not prevent the shutter 6 from being turned, so the Weight 19 will turn the same into an intermediate position, (represented by the dotted line 27, Fig. 3,) whereby the apparatus 15 is turned so that the chamber 8 will stand somewhat above the chamber 9, and the valve 1l will, on account of its own weight and that of the mercury in the chamber 8, fall down onto its seat 23. The mercury will now gradually fiow back into the chamber 9 through the small channel 13 in the said valve 11, whereby the apparatus 15, and thus the shutter 6, will gradually swing back into the position shown by full lines in Fig. 3. The speed of said swinging may be predetermined by making the cross-section of the channel 13, respectively, its lower mouth 131 in the case the latter, as illustrated in Fig. 4, is of smaller cross-section than that of the channel 13 itself, to suit.

The arrangements described above may obviously be modified in many ways without departing from the principle of the invention. Thus, for instance, the shutter 6, as well as the heating device for the air, may be of any convenient form and construction. For the hour-glass-shaped apparatus 15 any other suitable device may be substituted, and vso on.` In order to facilitate the turning of the shutter 6, the axle 7 may be journaled in wellknown manner in roller-bearings, and the pins of the said axle 7 may for the same purpose be arranged eccentrically, though I have not illustrated this in the drawings, because the said arrangements are well understood by any person skilled in the art.A

Having now described my invention and in what manner the same may be carried out, what I claim as new, and desire to secure by Letters Patent, is

1. The combination with a furnace-d oor for boilers and the like of, a casing having an opening, an axle in the said opening, a shutter fixed to the said axle and adapted to close the said opening, an hour-glass-shaped apparatus fixed to the said axle and adapted to K automatically close the said shutter a predetermined time after the furnace-door has been shut, and a number of angle-irons attached to the inside of the door and forming between them passages for the air iowing in through the said casing, substantially as and for the purpose set forth.

2. The combination with a furnace-door for boilers and the like of, a casing having an opening, an axle in the said opening, a shutter fixed to the said axle and adapted to close the said opening, an hour-glass-shaped apparatus fixed to the said axle and adapted to automatically close the said shutter a predetermined time after the furnace-door has been shut, a numberof angle-irons attached to the inside of the door and forming between them passages for the air flowing in through the said casing, and a hook adapted to engage the said hour-glass-shaped apparatus and to turn the same when the furnace-door is opened, substantially as and for the purpose set forth.

3. The combination with a furnace-door for IOO IIO

boilers and the like of, a casing having an opening, an axle in the said opening, a shutter fixed to the said axle and adapted to close the said opening, an hour-glass-shaped apparatus fixed to the said axle and adapted to automatically close the said shutter a predetermined time after the furnace-door has been shut, an arm pivotally-fixed to the said casing and adapted to turr the said shutter into a certain position after the latter has been opened, and a number of angle-irons attached to the inside of the door and forming between them passages for the air fiowing in through the said casing, substantially as and for the purpose set forth.

4. The combination-with a furnace-door for boilers and the like of, a casing having an opening, an axle in the said opening, a shutter fixed to the said axle and adapted to close the said opening, an hour-glass-shaped apparatus fixed to the said axle and. adapted to automatically close the said shutter a predetermined time after the furnace-door has been shut, an arm pivotally xed to the said easing and adapted to turn the said shutter into a certain position after the latter has been opened, a hook adapted to engage the said hour-glass-shaped apparatus and to turn the same'when the furnace-door is opened, and a number of angle-irons attached to the inside of the door and forming between them passages for the air flowing in through' the