US7973A - Improvement in air-tight frankun stoves - Google Patents

Description

R. D. GRANGER.. AIR TIGHT FRANKLIN -sToI/'II No. 7,973. Patented Mar. lull 17851.

UNITED' STATES PATENT OFFICE.

E. D. CHANGER, or ALBANY, ,NEWv YORK. 1

Specification forming p'art'of Letters Patent No;V 7,973, dated March 11, `185] To ctZZwhom, it maylcoitcern:

Beit known that I, RENssELAER D. GRAN GER, of Albany cityQand county, in the State of vNew York, -have invented a new and Improved Parlor-Stove, which I callfGrangers. Air-Tight Franklin Stove#7 -and I do hereby declare that the followingis a fu1l,..clear, and exact-description of the same, reference being had to the accompanying drawings, makingY partei' thisr specification, in which- Figure 1A shows a cross or profile .section `through the middleof the stove; Fig. 2, a perv spective view ofthe stove with the front opem The first Apart of my invention consistslin making the front and back of thefre-box'of closed metalplates to. form a hot-air chamber in front and one'behind, with the bottom-prof vided with a grate occupying about one-third of the area ,from thefront to back, and" provided with a damper to close the whole gratesurface or any part thereof, whereby the supplyofair to pass through the grate can be regulatedv to suit the draft ofthe chimney and the amount of combustion-required, or be entirely cut oif,- so that a slow combustion can be maintained in the fire-chamber by a. supply of oxygen fromfabove, on the principle of what is knownras the air-tightfstove. The front and back plates ofthe said fire-box, while.

they are employed to form `andre-box with but a small proportional grate-surface, at the same time constitute the linner plates of two airchambers, so that the air entering therein from the room will be heated by radiation.'

The second part of my invention cons-ists in combining with a fire-box-such as above described-havin g a grate at the bottom governed by a damper, vertically-sliding doors in front andtabove the fire-chamber, whereby the supply of air from the' room to the iniiammable products of the combustion of the fuel in the lire-pot can be regulated and directed at pleasure. The effect of the said sliding doors -in front is at the saine time such as to admit of a ready means of regulating the height and capacity ofthe front aperture, that the stove may be used as an open Franklin without smoking.

In the accompanying drawings, A A A A curvilinear or inclined front andback plates, a a b b, rounding or slanting. from the horizontal lower lines' of the front opening of the stove down-to the grate`B,.whi'e h occupiesa space at or near thecenter of the `lower part .of the stove, and is a little less than one-third of the width of the stove in breadth, extend.- ing from side to side thereof in its length, and is placed at the usual height `fromthe bottom of the stove, so A*as to allow a suicient ash- -V pit, C, beneath the grate.V l

The damper is asliding plate, ff, 'arranged to be, when not used, in the space between the back edgeV of the grate 'and-1 the back plate of the stove,,(or front edge and front plate, if preferred,) and when lpushed out vfrom there- 4 cess by its handle y is capable of closing airtight the said spaces of the grate and lire-box.

I arrange a sliding door or portcullis, h'h, moving verticallyy inja groove or recess in the jambs of theropen front, and continuing behind thefront plate of the stove; AThe door, whendrawn up,"lies behind the front plate, as shown in Fig. 2, and when dropped down Vcloses the front opening, 'as shown in Fig. 1. The door can be set to any desired height by means of a little dog or pawl hinged to a projection of ,the sliding door, which protrudes through alslot in the center of the front plate and. catches into teeth cut in the side moldings'of theslot, as shown in Fig. 3.

The iiueF. is constructed by throwing the upper back plate, 7;, of the nre-box with a slope forward from thefuel-receptacle at d,

and upward for a short distance, when with a curve itturns upward and backward toward the rear ofthe upper part of the stove, where the iiue passesthrough the ytop or upper part of the back'plate. The front part of the flue is a plate, which starts from the top' of the front opening of the stove at m and turns with a gradual curve toward the rear, slowly approaching the back plate till it reaches the exit-passage of the line. the flue leaves vacant spaces between it and the top, front, rear, and sides of the stove, which is constructed of plates perforated with openings, after some ornament-al design, permitting free radiation of heat from the flueplates.

It will beobserved from the drawings tha-t vsimilar spaces lie between the receptacle for fuel and the'vfront and back plates, also cov g This disposition of v .become heated, pass out andA circulate through the room.

When the lstove isfto be used as an open Franklin, the front door is to be'drawn up, -and the bottom may be drawn out. Dropping the door and closingthe damper under the grate converts the open Franklin into anair-tight Franklin;

By partially opening the front door and set-- ting Iit at any desired degree the draft of the 'stove may be managed at pleasure.

The great objection to Franklin'stovcs heretofore made has been their liability to smoke when Without doors, or with doors swinging on hinges, since the quantity of air admitted could not be controlled to meet the 'capacity' of the stove-and ilues, and the smoke would escape from the stove. My object in the construction-'oi' this Franklin is lto obviate this difficulty, and at the same time so to construct and combine my improvements that the `open Franklin may be converted at pleasure into an air-tight stove for economy in fuel and safety and convenience in use. y

What I claim as my invention, and desire to secure by Letters Patent, is-

'1., Making the fire-box with closed plate in front and behind, with a grate-surface at bottom occupying about one-third of the space between the front and back stove-plates to constitute Ahot-air chambers front and back, when such fire-box is. combined with a sliding damper at bottom, substantially as and for the purpose specified. Y

2. In combination with a hre-chamber constructed as above specifi-ed, and governed at bottom with a sliding damper, as specied, the open front with vertically-sliding doors, as described, and for the purpose specified.

BENssELAER D. GRANGER.

Witnesses:

ALEX. PORTER BRoWNE,

BISHOP.

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