US2568657A

US2568657A - Furnace grate structure, including ash removal means

Info

Publication number: US2568657A
Application number: US791859A
Authority: US
Inventors: William F Pfau
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-12-15
Filing date: 1947-12-15
Publication date: 1951-09-18
Anticipated expiration: 1968-09-18

Description

W. F. PFAU Sept, 18, 1951 FURNACE GRATE STRUCTURE INCLUDING ASH REMOVAL MEANS Filed Dec. 15, 1947 an ll INVENTOR. WILLIAM E PFAU BY Dl-EJARDINS, ROBINSON KEISER HIS ATTORNEYS Patented Sept. 18, 1951 UN 'IiTE 'l) PAT ENT QFFIiC Ei ormica GRA'TE' STRUCTURE, INGIQUDING asHRE ovAnMEAN-s William-"E; Pfau, Norwod-,,0hio Applicationfie'cemlierili 1947; sesame.- 791,859

4:16laims. (01. 1130-36):

This invention relat'esi-to a novel and improved combustion device' irr whichselid fuels; such ascoal, c'oke -or the like, are' burned'inheatingand cooking stoves, boilers-or furnaces, more particularly of the 'types used-in small homes I and dwell ings; The improved device provides aneflicient combustion. chamber." to which the fuel is-fed tobe completely burned; and the ash residue is removeddn; anLeVen-and uniform: flow in continuity witlrthefl'ow of: thetfuelthrough the combustion chamber.

The: inventionip'ertainsrparticularly" to a circular. grate: formed fromaseveral superposed circu larfrings: disposed to-prov-ide .acombustiomchamberr above. an; oscillating plate which serves as the bottomfor' the combustion; chamber; Ilever: arms are; provided. on the: top: of the oscillating; plate to be: manipulated". relatively 'torthe. plate: whereby theashresidue is removed continually from thebottom of thEcomb'ustionZchamber an'di over the edge of the plate wherelitl cank'be col= lected and removed; The lever arms form a U- shaped pocket or chamber in the bottom of the combustion chamber, and, when oscillated relatively to and with theplate, they continually push the ash residue out of the open side of the U-- shaped pocket or chamber to an ash receptacle or remover;

For a. better understandingof the invention, referenceis made. totheaccompanying drawings inzwhichti Fig. I is1a vertical cross-sectional view of the device embodying the invention.

Fig. 2 is a horizontal cross-section on line 2-2 of Fig. 1.

Referring to the drawings in which like numerals are used to designate like parts, numeral I is a base or foundation of a furnace bowl 2 of conventional design. A refractory ring 3 is supported on a ledge 4, preferably integral with the bowl, in the furnace above a grate composed of grate rings 5 with the bore of the refractory ring registering with the bore of the grate rings. There are any number of superposed grate rings to build up a fire box or combustion chamber of any desired depth. Knobs 5a may be formed at spaced intervals on the top or bottom edges of the grate rings to contact with the adjacent rings to provide air spaces therebetween. The grate rings are supported by means of any number of legs or brackets 51) which are attached to some fixed part of the furnace, such as wall 6 or the base I, or the bottom ends of the brackets or legs may be fixed to the plate I as shown. When the legs or brackets are fixed to some fixed 2- part ofthefurnace, such as base I or side wa'll 6; the grate rings are supported entirely in dependentlycf' the plate I, and this facilitates insertion-and removal of the oscillating plate unit. However; when the-legs -or bracekts are fixed to theplate 'f', thegrate ringswill be oscillated withthe-plate to-further agitate the contentsof the combustion chamber. About three or more of thes'elegs orbrackets, spaced apart, are-sufficient for supporting the grate rings,

The' pl'ate"! is-movably mounted-upon the baseor foundation- I by means o-fa-bearingunit 8, prefer-ably an anti friction one, intl-zrpose'd be tween the foundation and the plate: This bearin'g may. Ice-any conventional roller or ball bearing withtherollers: or balls 8a interposed betweent'woraceways 8-1;. A center stud 9isadvantagecusl y pro-vided; if desired, as a pivot for holdingthepl'ate'i centered; although the bearing alone may sufilce to keep the plate centered, particu larly if the raceways be fixed respectively'toi the base and' the plate a's' theymay be by spot .welding;- The studcan be fixedleither tos therfcnndae tionorthe plat'e by any suitable means such. welding, andi is' of a: diameter to th'ezboren of the"- raceway ringszof thei bearing;

Two: arms 15!]. are eaclit pivoted1to the top. sideof the plate! by means ofaawstudzshaft. H cfixed to'zthe plate: TheLarms-J are/duplicates,- and are: oppositelyfdisposed'with'thezcurvedends l2 iabut'. ting and: the main portions of the {arms s'parallell. The inside. edge. surfaces 13- of the ncurvedends; are arcuate, and,v with the'main -portions of: the: arms, they form a U-shaped member on the top of the plate to provide a U-shaped pocket or chamber for the bottom of the combustion chamber. The ends of the arms opposite to the curved ends are pivoted at 14 to a cross piece l5 which in turn is pivoted at I6 to a cross support [1. The ends l8 of the cross support may be fastened to thefurnace wall 5 by any suitable means, such as bolts Hi. This cross support thus firmly holds the plate unit in position.

The arms, as well as the plate to which they are pivoted, are oscillated by a prime mover, such as motor 20, which is attached to the arms by any suitable power transmission mechanism. This mechanism may advantageously be a link 2! pivoted at one end to the cross piece [5 or to one of the arms at M as shown. The link is pivoted at the other end by stud 23 on a cam 24 which is attached to the motor shaft.

As the arms are oscillated from the full to the dotted line positions, their arcuate inner edges will work the ash residue towards the opposite 3 side of the plate and over its edge where it gravitates to an ash remover 25, the ash remover being typified by a screw conveyor.

In order to prevent any ashes Working between the curved ends of the arms, their outer end surfaces 26 are diverged to provide a triangular area which can be partially or completely filled by a triangular piece 21 which is attached to the upper surface of the plate.

A front door 28 can be provided as shown in the wall of the bowl of the furnace to permit the unit being inserted in and removed from the furnace. The door can have an air draft regulator of conventional construction for letting in or shutting out the air.

The furnace may be hand fired or mechanically fired with a screw conveyor 29 disposed to discharge a supply of fuel into the furnace at the top of the combustion chamber. If mechanically fired, the necessary automatic thermostat controls may be used, but these are, of course, conventional, and may be used or not, as desired.

The device is simple in construction and may be readily installed as a unit in any conventional coal-burning furnace] It lends itself to hand or mechanical firing and moves the coal evenly through the combustion chamber where all parts are exposed to air mixture so that combustion will be complete. As the ash residue is removed, the fuel in the combustion chamber is slightly agitated and is moved uniformly towards the U-shaped chamber in the bottom where the ash residue is also uniformly removed to an ash containeror collector.

While I have illustrated and described one preferred embodiment for carrying the invention into effect, it will be understood that there may be various changes in details of construction without departing from the spirit of the invention.

I claim:

1. A combustion device for burning solid fuels 4 the bottom of the combustion chamber over the surface of the plate.

2. A combustion device for burning solid fuels comprising a fire box forming a combustion chamber, a plate beneath the fire box and disposed horizontally for supporting the solid fuel thereon, a bearing for movably supporting the plate, a pair of lever arms having curved ends and pivoted intermediate their length to the margin of the plate in spaced apart relation with the curved ends of the lever arms adjacent each other to form a U-shaped wall in the bottom of the combustion chamber around the top surface of said plate, and means for oscillating the plate and lever arms for causing said lever arms to push the contents of the bottom of the combustion chamber out of the U-shaped opening resulting from the U-shaped wall.

3. A combustion device for burning solid fuels comprising a fire box forming a combustion chamber, a plate movably mounted beneath the fire box, a pair of lever arms having curved ends and pivoted intermediate their length to the plate in spaced relation with the curved ends of the lever arms disposed adjacent each other to form a U-shaped pocket in the bottom of the combustion chamber above the plate, and means for oscillating the lever arms relatively to the plate for causing same to push the contents of the bottom of the combustion chamber out of the open end of the U-shaped pocket.

4. A combustion device for burning solid fuel comprising a fire box forming a combustion chamber for burning the solid fuels, a movable horizontally disposed plate beneath the fire box for supporting the fuels in said fire box, a lever pivotally supported intermediate its length to said plate with one end thereof in position to be moved adjacent to the top surface of the plate for pushing the material within the fire box toward one edge of the plate.

WILLIAM F. PFAU.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 753,793 Gorman Mar. 1, 1904 1,112,702 Jefferies et a1 Oct. 6, 1914 1,194,730 Glover et a1 Aug. 15, 1916