USRE10987E - Grate for stoves - Google Patents

Description

juETovEs & FURNACES.

Grates, Rocking oar, Bud

BESTAVAILABLE COP 2 Sheets-Sheet 1.

D. G. LITTLEFIELD.

GRATE FOR STOVES, 6w.

No. 10,987. Reissued Feb. 19, 1889.

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12s. STOVES & qpmcgs Grates, Fiqcm; i

BEST AVAILABLE CQPY 2 SheetsSheet 2.

D. G. LITTLEFIELD.

GRATE FOR STOVES, dzc.

No. 10,987. Reissued Feb. 19, 1889.

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lrlnin MW WIN UNITED STATES PATENT OFFICE.

I DENNIS G. LITTLEFIELD, O F ALBANY, NEW YORK.

GRATE FOR STOVES, ac.

SPECIFICATION forming part of Reissued Letters Patent No. 10,987, dated February 19, 1889. Original No. 390,242, dated October 2, 1888. Application for reissue filed October 20, 1888. Serial No. 288,713-

To all whom it may concern:

Be it known that I, DENNIS G. LITTLEFIELD,

of the city and county of Albany, in the State of New York, have invented new and useful Improvements in Grates for Cooking Stoves or Ranges, of which the following is a specification.

My invention relates to improvements in the fire-place bed for cooking stoves or ranges, in which it is necessary that all the fuel contained in the fire-places shall be brought into a complete state of ignition before they can be effective for broiling, boiling, frying, and bakingfand where anthracite and other coal or crushed cokev is used as fuel; and the object of my invention is to maintain a continuous fire, if so required, without dumping and cleaning out the fire-place, and to permit the fire to go out when so required and afterward be able to start a new fire without emptying and cleaning out the fire-place, as required by all fireplaces for cooking stoves or ranges heretofore constructed.

My objects are obtained by means of new combinations of the mechanical devices illustrated in the accompanying drawings herein referred to and forming a part of this specification, in which Figure 1 is avertical section of the fire-place end of a cooking-range with two oscillatory concavo-convex grates turned to bring the central portion of the fire-bed to its highest position, as when used in combination with stationary-side grates to form a large gratesurface and a side opening, so that ashes and I cinders can be removed from the lowest part of the fire-place. Fig. 2 is a plan of these grates as shown in Fig. l, removed from the fire-place; Fig. 3, avertical section of the fireplace detached from the range, showing the oscillatory concavo-convex grates turned to their lowest position, so as to form a pocket therein to be used in combination with stationary side grates for the purpose of keeping the fire over night or for a long period, or for the purpose of starting a new fire upon the remnants of an old fire after it has been permitted to go out; Fig. 4, an end elevation of these grates removed from the range,'showing an arm and the gearing for operating the oscillatory grates and holding them in position, as may be required; Fig. 5, a front elevation of the same; Fig. '6, a detached perspective view of the stationary grates; and Figs. 7 and 8 are vertical sections of a slightly modified construction of the oscillatory concavo-convex grates.

In the drawings, A is the fire-box of a cooking range or stove, which fire-box is preferably made with an oblong form and having its oppositely-located sides form ed of any suitable material, as practiced by the trade. Through the front side of the fire-box is made a horizontal opening, a, for the purpose of admitting air to within the fire-box and for introducing a poker for operating with the coal, ashes, or clinkers, as occasion may require.

B is a stationary bottom plate, which sup ports the linings of fire-brick forming the sides of the fire-box. This stationary plate is made in the form of an oblong square frame, and has at its opposite sides the downwardlyinclined bars or fingers b, alternating with slots b, as shown in Figs. 1, 2, and 6, and between these two series of slotted bars or fingers is the clear opening b (Shown in Fig. 6.)

C O are oscillatory concave-convex grates, which are mounted on trunnions and are suspended within the opening I) of the bottom plate, B, and relatively below the slotted bars orfingers b, as illustrated. These oscillatory grates are used in pairs, and each grate is substantially a duplicate of the other and are each made to comprise a series of concave bars, 0, and convex bars 0', which bars 0 and c are connected together by being castin one piece and connected at their points of junction 0 with a longitudinal bar, 0 as shown in Figs. 1 and 2, or connected in line with the trunnions c, as shown in Figs. 7 and 8. The trunnions c of these oscillatory grates are suitably supported through the ends of the stove and are provided at one end with two segmental gears, D D, which gears engage with each other to produce a simultaneous movement of the oscillatory grates C. One of the trunnions c is preferably extended or has secured to it an arm which projects C C, as shown and above described, I am enabled to produce a grated bed to the fire-box A, which will be composed, substantially, of four parts namely, of the two series of slot ted fingers b at the sides of the clear opening I) of plate 1% and the side walls of the firebox A and the oscillatory grates O Cand these parts of the grate can individually contract. and expand without affecting the other parts; and, further, by the above-described construction of parts, there can be produced at will a grated fire-bed which will have substantially a level grated surface, which will have an extension from one side of the firebox to the other, and with the parts (forming this grated surface) so situated that the incandescent coals lying on the upper side of any one of said parts will not be in a situation to contribute to the excessive heating of any of the other parts of this grate and thereby rapidly burn out the same or contribute to effeet a warping of the same.

gers b, so as to At the will of an operator the oscillatory grates can have their members.the eonca e bars 0 and the convex bars c'changed in their situations relative to the grated bars or finproduce an extension of the vertical depth of the fire-box, as shown in Figs. 3 and 8, over that shown in Figs. 1 and 7, and this vertical extension will be downwardly from the plane of the lower ends of the fingers b and relatively central between the two side walls of the fire-box A, and in the opening I) in the plate B. This vertical ex tension of the fire-box A will operate as a receptacle for ashes and clinkers or partiallyburned fuel, to hold the same below the plane of the stationary fingers b, and thereby preserve to the fire-box A its full capacity for holding fuel in a state of combustion and sub stantially free from ashes or clinkers. 'hen the oscillatory grates C C are turned so that their convex bars 0 are in a situation substantially together, as shown in Figs. 1 and 7, the depth of the fire-box A will be lessened from that last described, and in this position of these grates I prefer to start the first fire. When these grates C are in the position last described, the stationary grates b and the bars 0 of the oscillatory concavo-convex grates form a continuous fire-bed on nearly a level plane, so that a poker can be introduced into the fire-place through the side opening, a, for the purpose of removing ashes and slag from the lowest part of the fire-place, and the oscillatory concavo-convex grates 0 may have a slight vibratory motion imparted to them by the use of the arm E, and thereby ashes may be removed from the lowest part of the fire-place without disturbance to the burning fuel. Thus used, astove or range can be used for an indefinite period and be as effective as when the fire was first started. To maintain the fire over night or in an active condition, the oscillatory concavo-convex grates must be turned to their lowest position, F, as shown in Fig. 3, whereby the pocket is formed for receiving the partially-burned fuel, clinkers, and other debris from the lowest part of the fireplace, when, by filling the fire-place A with fresh fuel and properly checking the draft leading from the range, the combustion will proceed in a slow and sluggish manner during the night -or for a long period, air to support combustion entering into the fire entering the fire-place through the stationary side grates, b, and through the side opening, a, the same as when keeping the fire over night or for along period. Burning in this Way for a time will produce a fire fully as effective as if started anew, when the oscillatory concavoconvex grates are in their highest position, and will so continue until all combustible matter contained in said pocket is consumed. This accomplished, by returning the oscillatory grates O to their highest position, G, Fig. 1, their sharp cutting-edges c will remove the ashes, clinkers, and other debris from the lowest part of the fire-place, so as to leave a clean bright fire, the same as when it is first started on the oscillatory concavo convex grates as combined with the side grates, b, to form a large grate-surface, and the horizontal openings a through which ashes and clinkers can be removed from the lowest part of the fire-place.

Having described my inven tion,what I claim as new, and desire .to secure by Letters Pat ent, is

1. The combination, with the stationary bottom plate, B, constructed substantially as described, and having the clear opening I) relatively between the oppositely-located series of downwardly-inclined fingers b, altermating with slots, of the two oscillatory confire-box, of the concavo-convex grates C, suitably connected, mounted on trunnions, and suspended within the opening of said stationary bottom plate and relatively below the slotted fingers b, substantially as and for the purposes set forth.

3. The combination, with the fire-box A,

stationary bottom plate, B,'at the lower end my bottom plate and relatively below the of said fire-box, and having the clear opening slotted fingers b, substantially as and for the b and the grated bars or fingers b, pro ecting purposes set forth. relatively inwardly from the bottom of said DENNIS G. LITTLEFIELD.

5 fire-box, of the concavo-convex grates O, suit- VVit-nesses:

ably connected, mounted on trunnions, and SAMUEL H. KAVANAGH,

' suspended wit-hinthe opening of said station- W. J. SCOTT.

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