US1089237A

US1089237A - Forced-draft grate.

Info

Publication number: US1089237A
Application number: US70734212A
Authority: US
Inventors: Robert G Long
Original assignee: Individual
Current assignee: Individual
Priority date: 1912-07-02
Filing date: 1912-07-02
Publication date: 1914-03-03
Anticipated expiration: 1931-03-03

Description

R. G. LONG.

FORCED DRAFT GRATB.

APPLICATION FILED JULY 2, 1912A 1,089,237, Patented Mar. 3, 1914.

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R. Grx LONG.

FORCED DRAFT GRATE.

APPLICATION FILED JULY 2, 1912.

1,089,237. Patented Mar. 3, 1914.

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ROBERT Gr. LONG, OF LAWRENCE, KANSAS.

FORCED-DRAFT (5R-ATE.

reageer.

Specification of Letters Patent.

Patented listar. 3, rigid.

Application filed July 2, 1912. Serial No. 707,342.

T0 @ZZ 'whom it may concern Be it known that l, Roem-zr G. LONG, a citizen of the United States, residing at Lawrence, in the county o-f Douglas and State of Kansas, have invented new and useful improvements in Forced- Draft Gratos, of which the following is a specification.

he invention relates to grate bars, and more particularly to the class of forced draft hollow grates for use in fire boxes of furnaces, locomotives, or the like.

The primary object of 'the invention is the provision of a hollow grate in which the bars thereof will permit an air blast to be distributed uniformly throughout the fuel bed, thus assuring perfect combustion when burning low grade fuel and refuse.

Another object of the invention is the provision of a grate of this character wherein the hollow grate bars thereof have removable top sections which when mounted in proper position will be secure without requiring the use of bolts or other fasteners which latter have heretofore been a source of annoyance and trouble because the same become loose due to the expansion and contraction of the grate bars and on cleaning the gate they become disarranged or fractured requiring new bolts to be substituted, the top sections when removed permitting access to be had to the interior of the grate bars to enable the ready and quick cleaning thereof, it being impossible for the top sections of the grate bars to work loose or out of place because of the expansion and contraction, thereby avoiding dirt working underneath or into the said grate bars when in use.

i further object of the invention is the provision of a grate of this character wherein a forced draft will be uniformly distributed throughout the fuel bed for obtaining a perfect combustion of the fuel, the grate being capable of conversion so as to afford a natural draft furnace.

A still further object of the invention is the provision of a grate of this character in which the bars thereof 'taper for maintaining the uniform pressure of air entering the fuel bed throughout the entire length of each bar, the latter being fitted together so as to leave no dead space between them, and the forced air blast passing through the grate bars will become equally distributed so as to intermingle or unite with the carbon gases as they are distilled from the fuel for the perfect combustion thereof with maximum heat quality.

A still further object of the invention is the provision of a grate wherein the bars thereof are given direct communication with a main air duct or conduit at the front end of the furnace, the top sect-ions of the grate bars being readily removed without disturbing the same.

A still further object of the invention is the provision of a grate in which all kinds of fuel can be burned to the best advantage and more especially slack coal, or low grade fuel, whereby perfect results therefrom can be attained.

A still further object of the invention is the provision of a grate wherein the bars thereof may be automatically cleaned in a simple and convenient manner.

1With these and other objects in view, the invention consists in the construction, co1nhina-tion and arrangement of parts as will be hereinafter more fully described, illustrated in the accon'ipanying drawings, and pointed out in the claims hereunto appended.

ln the drawings :"Figure l is a fragmentary perspective view of a furnace with its front partly broken away, showing the improved forced draft grate constructed in accordance with the invention mounted therein. Fig. i2, is a fragmentary vertical longitudinal sectional view through the furnace. Fig. 3 is a top plan view of one of the grate bars. Fig. l is a vertical longitudinal sectional view of the same. Fig. 5 is a vertical transverse sectional view through a pair of the grate bars. Fig. G is an enlarged fragmentary vertical longitudinal sectional view through one of the grate bars showing the main air duct communicating therewith. lTig. 7 is a plan view of the bottom section of one of the grate bars. Fig. S is a fragmentary vertical longitudinal sectional view through one of the grate bars at the rear end thereof.

Similar reference characters indicate corresponding parts throughout the several views in the drawings.

Referring to the drawings by numerals, l0 designates a portion of a furnace of any ordinary well-known construction having the usual tire-box 1l and ash-pit 'l2 therein, the side walls of the fire-box l1 being formed with a raised shoulder 13 for hori- Zontally supporting a forced draft hollow Cil jio

grate A, the details of which will be hereinafter more fully described.

The forced draft hollow grate comprises a plurality of independent or individual hollow grate bars each including a box like bottom section or body 14 formed with rearwardly inclined upper side edges 15, thus presenting a rearwardly tapered formation to the said body or section, the front and rear top edges of the section or body 14 being formed `with out-turned marginal edges 14 which, together with the sides, have an upstanding portion 15 to provide a seat 1G in which is engaged the depending rim 17 of a removable top section 18 for the grate bar. The depending rim 17 of the top section 18 for each grate bar at its rear end is formed with an out-turned lip 19 which is adapted to detachably engage in a groove 2O opening into the seat 16 at the rear of the section or body 14 and formed by the iii-turned portion 19 on the said flange 14 so as to fasten the top section thereon.

Formed in the top section 18 of each grate bar are transverse rows of longitudinally disposed slots 21 formed with beveled end and side walls 22, the slots being designed to emit forced air drafts from the body or section 14 to the fuel bed of the grate with uniform pressure and throughout the extent or area of the same.

it is of course understood that the slots 21 may be dierently arranged should the occasion require from that shown in the drawing'.

Leading upwardly through the ash-pit 12 in the furnace 10 is a forced draft main a-ir duct or conduit 23 provided with a hollow head 24 having reversely tapered ends 25, the said head being suitably connected with the body 14 of each grate bar at the front end thereof so as to supply an air blast interiorly thereof from the front end of the furnace. rThe duct or conduit 23 is connected with any suitable source of forced air supply.

Provided in the bottom of each section or body 14 of the hollow grate bars are a plurality of transversely disposed openings 25. the same being adapted to register with similar openings 26 formed in a slide 27 arranged interiorly of the body or section 14 and superimposed upon the bottom thereof. Each slide 27 is actuated by sliding movement through the medium of a crank arm 28 engaging the same, and iixed to a rocking shaft 29 mounted in bearings 30 which are fixed to and depend from the sections or bodies 14 of the grate bars.

rlfhe shaft 29 is manually operated by means of a throw lever 31 having connection therewith so that the slide may be shifted to closed or open position. The slide 27 when open permits a natural draft to enter the grate bars, and also when a forced draft is admitted to the grate bars any dust, ashes, or the like will be blown through the slots 25 and 2G for the cleaning of the grate bars.

The main duct 23 is provided with the usual cut-off damper 32 whereby the forced draft passing therethrough may be entirely cut-off or regulated as the occasion may require.

The box-like bottom section or body 14 of each grate bar having the rearwardly inclined upper edges permits the removable top section 18 to rest thereon and be disposed at a rearward inclination within the nre-box, thereby increasing the combustion space within the furnace over the grate bars which are designed to sustain a uniform pressure of air entering the fuel bed through the entire length of each bar. By reason of the mounting of the top section 18 upon the bottom section or body 14 the use of bolt fasteners or the like is obviated, and also enables the easy removal of the said top section from the bottom section by reason of the front end of the top section so that the bottom sect-ion or body 14 can be readily cleaned as the occasion may require. It will be obvious that the bottom of the bottom section or body 14 is straight and disposed horizontally so as to afford a uniform space beneath the fuel bed. The out-turned flange 19 on the rim at the rear end of each top section 18 is designed to engage in the groove 2O provided at the rear end of the bottom section or body 14 so that the rear end of the said top section will not become disengaged from the bottom section or body 14 until the front end of the top section is raised. The vertical straight side walls of the bottom section or body 14 of each grate bar permits the placing of the said bars in juxta-position to each other whereby the side walls of adjacent bars will contact throughout the extent thereof thereby preventing the accumulation of ashes or the falling of the same or fuel therebetween from the fuel bed.

From the foregoing it is thought that the construction and manner of operation of the device will be clearly understood, and therefore a more extended explanation has been omitted.

That is claimed is 1. A grate comprising a plurality of hollow grate bars, each bar including separable top and bottom sections formed with straight side and end walls7 the upper edges of the side walls of the bottom section being rear wardly inclined, an out-turned marginal iiange formed at the front and rear upper edges of the bottom section, said bottom section being formed with an upstanding portion about its free edge to provide a seat, a top section having a depending rim resting upon the seat, an out-turned lip formed at the rear end of the said rim7 the upstanding portion at the rear end of the bottom section being in-turned to overlap the lip at the rear end of the rim on the top section, and a draft iue connected with the largerend of the bottom section and Communicating therewith.

2. A grate Comprising a plurality of holloW grate bars, each bar including separable top and bottom Sections formed With Straight side and end Walls, the upper edges of the side walls of the bottom section being rearwardly inclined, an out-turned marginal flange formed at the front and rear upper edges of the bottom section, said bottom seotion being formed with an upstanding portion about its free edge to provide a seat, a top sect-ion having a depending rim resting upon the seat, an out-turned lip formed at the rear end of the said rim, the upstanding portion at the rear end of the bottom section being iii-turned to overlap the lip at the rear end of the rim on the top Section, a draft flue connected With the larger end of the bottom section and communicating therewith, the said bottom section being provided with draft openings, a slide mounted Within each bottom section for controlling the draft openings, and means for actuating the said slide.

In testimony whereof I aix my signature in presence of two Witnesses.

ROBERT G. LONG.

Vitnesses O. F. RUSSELL, HARRY C. ALLPHIN.

Y Home@ of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D. C.