US325651A - cobdray - Google Patents

Description

(No Model.)

G. W. BLACKBURN 8e W. I. CORDRAY.

PUBNAGE eRATB. e

No.'325,651. 1 Patented Sept. 8, 1885.

We Z... mmrlll me l nun UNITED STATES FFiCE@ PATENT GEORGE XV. BLACKBURN AND TWILLIAM F. COBDRAY, OF COLUMBUS, OHIO; SAID CORDRAY ASSIGNOR TO HARRIET CORDRAY, OF SAME PLACE.

FU RNAC SPECIFICATION forming part of Letters Patent No. 325,651, dated September 8, 1885.

Application filed March 22, 1884. (No model.)

To all whom it 11i/ay concern:

Be it known that we, GEORGE W. BLACK- BURN and WILLIAM F. CORDRAY, citizens of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Furnace-Gratos, of which the following is a specification, reference being had therein tothe accompanying drawings, in which- Figure 1 is a plan or top view of the grate. Fig. 2 is a longitudinal vertical section of the same. Fig. 3 is a perspective view of the front tumble-bar. Fig. 4. is a side view of one of the tipping grate-bars.

Our invention relates to improvements in furnace grate-bars; and the objects of our in1- proveniente are to provide a furnace having a series of stationary grate-bars, made narrower at the fore end and curved upward at the rear end, with one or more grate-bars provided with a bearing in the middle of their length, and adapted to have their fore end tipped downward and again locked on the same level as the others. We attain these objects by the construction illustrated in the accompanying drawings, in which- A represents the side wal ls, and A the bridgewall, of a furnace provided with the improved grate-bars B. Each of these bars is so formed that the upper face of its forward portion, I), (extending about one-half of the length of the grate-ban) is narrower than the upper face, b2, of the rear portion, so that the air-openings c in the front end of the furnace are wider than the air-openings c2 in therear end. The draft is thus improved at the front of the furnace, where it is most needed, time is saved in getting up steam, and the danger of overheating or blistering the boiler over the bridge-wall is obviated.

To protect the bridge-wall A against intense heat, and thus permit ordinary bricks to be used in its construction, the rear portion, b2, of each grate-bar is gradually curved upward, and extends on alevel with the top of the bridge-wall. The curve given to said rear portion, Z, is substantially a segment of a circle, and permits a poker to follow the curve, turn any clinkers upside down, and bring them forward to be easily removed. The gratebars are supported at the rear end upon the I transverse bars D and at the front upon the transverse bars D2.

To facilitate the removal of cinders, elinkers, dto., the two grate-bars B2 next to the last grate-bar on each side of the furnace are constructed so as to have their forward -endeasily tipped downward. For this purpose they are provided, about the middle of their length, with a semi-cylindrical bearing, b3, in the under side thereof, to rest upon trunnions b4, projecting from theside ofthe two adjoining gratebars. (A. transverse bar extending across the ash-pit may be used in place of the trunnions.)

The two tipping grate-bars B2 are connected at their fore end by a tumble-bar, E, the ends of which enter mortises or recesses b5 in the sides of the bars B2.

To retain'the front end of the bars B2 on a level with the bars B, there is projecting from the front of the tumble-bar E a lug, e, to rest upon a spring-latcl1,f, passing through the front wall of the furnace. This latch is carried by a spring, F, secured to the front wall at f2, and is provided with a handle, f3, at its upper end. The ends of both the latch f and the lug e of the tumble-bar are beveled, so as to readily pass each other when the grate-bars B2 are to be returned to their normal position.

The grate-bars B and also are provided with the usual check-pieces or side projections, b5, at the ends and intermediate portions thereof, to prevent their warping and retain them at proper distances apart.

The rear half of the tipping grate-bars is slightly heavier than the front portion; but when coal and clinlrers are piled upon said forward portion it will have a tendency to tip down, and said motion is arrested by a chain, C, having one end secured to the rear portion of the grate-bar, and the other to the rear wall or to some other stationary part. TWhen the bars have been relieved by the fireman of the coal and clinkers upon their front end, they will return to their normal horizontal position either automatically or with the help of the fireman.

Having now fully described our invention, we claiml. The combination of stationary grate-bars, having their rear portion curved upward and provided with trunuions or their described equiva1ents,with the grate-bars B2, connectingin the pivotcd grate-bars, substantially as and ro bar E, having lug e, and the latch f, substanfor the purpose described.

tially as and for the purpose described. In testimony whereof we affix our signatures 2. The combination of stationary grate-bars, in presence of two witnesses. 5 having their rear portion curved upward in GEORGE WV. BLACKBURN.

substantially the form of a segment of a circle, WM. F. CORDRAY. with simi1ar1y-curved bars adapted to have Witnesses: their forward end tipped downward, and a con- C. C. SHEPHERD,

necting-bar having its ends entering recesses FREDERICK BUEHNE.

Images