US1066670A - Fire-door for furnaces. - Google Patents

Description

W. N. SPRINGER.

PIRE DOOR FOR FURNAGES.

APPLICATION FILED JUNE 1, 1905).v

Patented July 8, 1913.

2 SHEETS-SHEET l.

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W. N. SPRINGER.

FIRE DOOR POBI FURNACBS.

APPLIoATIoN fILBD JUNE 1, 1909.

1,066,670, Patented July 8, 1913.

2 SHEETS-SHEET 2.

@GOCDGQG wf/M @www atkwwux WILLIAM N. SPRINGER, 0F

PEORIA, ILLINOIS, ASSIGNOR TO AVERY COMPANY, A

CORPORATION OF ILLINOIS.

FIRE-DOOR FOR FURNACES.

Specification of Iletters Patent.

Patented'- Juiy e, 191e.

Application led June 1, 1909. Serial No. 499,454.

To all whom it may concern.'

Be it known that I, WILLIAM N. SPRINGER, a citizen of the United States, residing at Peoria, in the county of Peoria and State of Illinois, have invented certain new and useful Improvements in Fire-Doors for Furnaces, of whichthe following is a specification, reference being had therein to the accompanying. drawing.

This invention relates to fire doors for furnaces and in particular to those adapted and intended for use `on the furnaces of traction engines or locomotives. It will be understood, however, that a ireloor embodying my invention is equally applicable to any other furnace into which it is desirable to feed fuel by means of a shovel.

The principal objectof the invention is to produce a door of the type specified which may be quickly and readily opened by means of a lever within reach of the firemans foot.

My invention further relates to various details of construction and arrangements of parts `which will be fully set forth in the following specification.

Of the drawings-Figure 1 is a fragmentary view showing the rear part of a traction engine with a door embodying my invention attached. Fig. 2 is a cross sectional view through the door and the-frame. The dotted lines show the door in the open position. Fig. 3 is'an elet/ation. Fig. 4 is a crosstsectional view through the frame and one set ofvbearings, the corresponding door` section being shown in elevation. Fig. 5 is a detail view of one of the gear wheels.

Referring to the drawings, 1 represents y the frame of the door. This frame 1s adaptbearings 7 7 for tened in place by ed to be attached to the fire-box of a boiler or to .any other suitable furnace by means of bolts passing through the holes 2.

3 and 3 are the 4sections of the 'door which carry the tapered trunnions 5, 5.

6, 6 are bea-ring bracketswhich are bolted to the framel and which have tapered the trunnions 5, 5. y

The outer endsyof the trunnions are pref.- erably square in cross section. Gears 8 and 8 are mounted upon the s uare ends ofy the trunnions at one end of t e -door sections and mesh with each other. They `are fasthe cotter pins 9. Each ofthe gears 8 and 8 is'formed of two secl be adjusted relatively proper and are provided with the lugs .4., l .are rotated, carrying with t tions 8 and 8" which Aare 4secured together. .essary to use by the through bolts 8 which pass through slots 8d in the inner section 8". By loosening the nuts on the bolts the section 8 may to the section 8b.

Each of the door sections 3 and 3 is provided with a plate 10 which is attached by means of the bolts 11. Each of these plates is in the form of asection of a cylinder having its axis passing through the axis of the corresponding trunnions, 5. The plates are intended to protect the door sections from the injurious effect of the heat and of the products of combustion. These plates may be renewed from time to time, whenever such renewal is necessary. The door section 3 is provided with a lip l2 which is formed to engage the frame' 1 and limit the motion of the door section. The section 3 is provided with a similar lip 13. The section `3 is also provided with a lip .14: which is adapted to overlap the section 3, and thus form a comparatively tight joint between the two.

15 is va pitman pivotally attached at its upper end to the gear 8 in such a way that the downward movement of the pitman will rotate the gears to open the door sections. The lower end of the pitman is .attachedto a foot-lever 16 which is pivotally one end and provided with ay spring 17 which tends to lift` the lever.

The operation of the device The inner and outer parts of the gears 8 and 8 are first adjusted so that the door sections may be moved into the closed position shown bythe full lines of Fig. 2. The corresponding positions of the gears and the operating mechanism is shown in Fig. 1. When it 1s desired to open the doors to throw in .a shovelful of coal, the fireman depresses with his foot Ithe lever 16. `By means of the pitman 15, the glears 8 and 8 sections which assume the `positions indicated by the dotted lines of Fig. 2. As soon as the fireman releases the lever 16, the spring 17 lifts it and the operation above described is reversed brought to their closed position.

It will be understood that I do not desire to limit myselfto' the exact details herein shown and described, as many changes in the details may be made within the scope of my invention. For instance, it is not necmounted at em the door and door sections are the complete gears which have 11 shovelful of coal.

l proved door.

been shown, for as the an angle of somewhat grees, fragmentary gears or would be found sutlicient sections. The foot operating mechanism which I have shown and described is the one which I at present able mechanism may be used for actuating the gears.

The advantages of a fire door embodying my invention wil-l be readily apparentto those familiar with eration of furnaces and boilers. With the simple swing doors which are at present commonly used it is necessary for the fireman to open the door before picking up a This necessitates the door being open for a considerable time with aconsequent loss of heat by radiation. A considerable amount of cold air goes into the furnace and this tends not only to deaden the fire but also in time to bring the boiler into a leaky condition because of the consequent contraction and expansion of the tlues. All of these diliiculties and disadvantages are obviated bythe use of my im'- A still further advantage incident to my improved door is that t-he fireman is more fully protected from theheat of the fire and is enabled todo his work more comfortably and more satisfactorily. Another advantage in the construction which I employ is that it is entirely counterbalanced. The section 3 is moving downward at the same time-that the section 3a is moving upward, and therefore the only force required is that necessary to overcome the friction and the tensio-n of the spring 17.

am aware that various forms of doors have been proposed which may be operated by a foot or hand lever or by power, and I do'not, therefore, claim broadly a door so operated. What I claim is:

1. In a boiler furnace door, the combination of a yvertical door frame, two parallel pairs of alined' bearings mounted on the frame in a remote plane. parallel to and on the outer side of the vplane of the said frame, twodoor sections normally positioned adjacent one another at the outer side of the door frame to close the opening therethrough, a pair of trunnions on one door section mounted in one pair of the said alined bearings, a second pair of trunnions von the other door section Ymounted in the other pair `of alined bearings, gearing between the door sections -for causing the gears rotate through less than ninety demovement of one of the sections upward about its trunnion axis along a path between the said axis and the frame simultaneously with the-movement of the other section downward about its trunnion axis alongva pat-h betweenthe said axis and the f-frame, whereby counterbalancingis effectquadrants to operate the door door opening and to swing oppositely about prefer but other suit-4 vsurface concentric with the lpivotal .axis of the construction and opl ed, and means for moving the doors, substantially as set forth.

2. In a furnace door,

a'door frame, and door sections adapted to normally close the pivotalpomts 1n a plane on the outer side of the plane of the said door frame, each door sectioncomprising a main outer plate and a removable inner plate having a curved the door, substantially as set forth.

3. In a furnace door, two parallel door sections, each provided with two pivotal trunnionsin alinement with each other outside of the plane of the section and substantially midway bet-Ween its edges, a door frame provided with outwardly extending bearings one for each trunnion, and two intermeshing gears one mounted on a trunnion of one section and the other on the corresponding trunnion of the other section, one of said gears being adjustable angularly about lthe said trunnion axis, substantially as set forth.

4. In a furnace door, two parallel door sections, each provided with two pivotal trunnions in alinement with each other outside of the plane of the section and substantially lmidway between its edges, a door frame provided with outwardly extending bearings one for each trunnion, two intermeshing gears one mounted on a trunnion of one section and the other on the corresponding trunnion of the other section, one of said gears` being adjustable angularly about the said trunnion axis, and mechanism for ro- 100 tating said gears to open or close the said vdoor sections, substantially as set forth.

5.*In a furnace door, two parallel door sections, each provided with two pivotal trunnions in alinement with each other outside of the plane of the section and substani tially midwt y between its edges, a door frame provided with outwardly extending bearings one for each trunnion, two intcrmeshing gears one mounted on a trunnion of 1.1.0 one section and the other on the corresponding trunnion of the other section, one of said gears being adjustable angularly about the said trunnion axis, mechanism for rotating said gearsto open said door sections, and .M5 means for automatically closing said door` sections,-substantially as set forth.l

In -ahfurnace door, a door frame, two

door sections normally positioned adjacent one another at the outer sidel of the door frame to close the ope-ning therethrough, means for pivotally mounting the sections to swing away from each other, about points in a plane outside the plane of the sections, means for connecting the sections toinsure their simultaneous movement in opposite directions, a'lip on one of the adjacent edges ofthe sections to overlap the other edge when the sections are in normal position, anda lip at each of the non-adjacent edges of the `door sections, each lip lying at an angle to the plane of the corresponding section and adapted to engage the door frame, substantially as set forth. p y

7. In a door, a frame, bearing brackets, one at each end of the frame, each bracket being provided with two bearing apertures, two door sections each provided with two trunnions in alinement with each other and located in a line outside of and parallel to the plane of the door section, and similarly placed relative to -its edges, and each adapted to fit into and turn' 1n the bearing aper-l tures of the brackets, lips on the door sections whereby they may engage the frame to limit their motion and make an overlapping joint therewith, a lip on one of the sections which overlaps 4the other section when they are in the closed position, intermeshin gears upon the trunnions at one end of eac door section, and means for rotating one of the gears to move the door sections, substantially as set forth.

I In testimony whereof I ailix my signature,

in presence of -two witnesses.

WILLIAM N. SPRINGER.

Witnesses:

H. N. BLAcKMoN, E. M. Vooizmms.

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