US1316725A - Boiler and furnace grate - Google Patents

Description

W. M. KINGSBURY AND M. L. FOOTE. BOILER AND FURNACE GRATE.

APPLICATION FILED FEB. 12. ms.

1,316,725. Patented Sept. 23, 1919.

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W. M. KINGSBURY AND M. L. FOOTE. BOILER AND FURNACE GRATE.

APPLICATION FILED FEB. I2, 1918. 1,316,725. PatentedSept. 23, 1919.

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WILLIAM M. KINGSBURY AND MOSES L. room, or CLEVELAND, oHIo.

BOILER AND FURNACE Specification of Letters Patent.

Patented Sept. 23, 1919.

To alt whom it may concern:

Be it known that we, WILLIAM M. K1Nes- BURY and Moses L. Foo'rn, citizens of the United States, residing at Cleveland, in the county of C uyahoga and State of Ohio, have invented certain new and useful Improvements in Boiler and Furnace Grates, of which the following is a specification.

This invention relates to furnace grates for boilers or water heaters, and particularly to hollow grates through which water or other fluid may circulate, and it is especially useful in down draft furnaces.

An object of the invention is to construct a grate of this type of a plurality of units so connected that any one or more thereof may be removed or blanked off without pre- Venting the use of the remainder.

A further object is to combine such a grate with a header to distribute the circulation of the fluid through the units. f

A further feature of the invention is that the grate has no joints exposed to the action of the fire.

A further object is to so shape the grate sections as to accommodate the expansion thereof in proportion to the heat developed.

A further object of the invention is to so shape the units as to give clearance for the fuel; that is the bottom spaces between the units are wider than the top spaces.

The invention also provides convenient means for making the proper circulating connections with the grate units, for the circulating medium.

With these and other objects in View, one embodiment of the invention is illustrated inthe accompanying drawings in which Figure 1 is a vertical sectional view of the grate and part of the boiler;

Fig. 2 is a front elevation;

Fig. 3 is a sectional plan;

Fig. 4 is a detail in longitudinal section of one of the units;

Fig. 5 is a section on the line 5-5 of Fig. 4;

Fig. 6 is a front elev'atlon of the header;

Fig. 7 is an end view thereof;

Fig. 8 is a section on the llne 88 of Fig. 6;

Fig. 9 is a cross sectlon of two of the units, showing clearance therebetween.

The boiler may be of any suitable construction. As shown it comprises a plurality of sections A, with a fire box B and ash pit C, a section D at the rear of the fire box being extended downwardly to divide the fire box from the rear part of the boiler, said section having an opening E at the back of the ash pit, whereby the draft is downward through the grate and thence rearwardly through the boiler sections.

The grate proper consists of a plurality of units or bars standing edgewise beside each other as shown in Fig. 3. The front ends of these bars are supported at the boiler front, and the rear ends rest upon the ledge 13 extending across the partition section D. Each unit has an upper passage 6 and a lower passage 7, separated by the vertically tapering partition 5, the passages 7 and 6 communicating through a return bend at the inner end of the bar, the former be-' ing the inlet passage and the latter the outlet passage, so that the flow is rearward through the passage 7 and forward through the passage 6. These bars or units when assembled to form the grate are spaced apart by side flanges 30 at the front, and projections 17 at the rear, where they rest on the ledge 13. This ledge projects from a water-cooled bridge-wall section of the boiler and the ends of the bars are spaced from the wall of the section, to allow for expansion rearwardly on the ledge. As shown in Fig. 9 the units are tapered downwardly so that the space 24 at the top is narrower than the space 25 at the bottom, thereby giving clearance downwardly for the consumed fuel.

The respective units are connected at the front of the furnace to a single header extending across the front thereof. This header is indicated at 12 and has a lower or inlet passage 8 and an upper or outlet passage 4: separated by a partition 30, and

- the header is connected to the respective passages 6 and 7 by means of taper nipples or thimbles 3, which fit in the ends of said passages and in taper seats 28 in the inner wall of the header 12, the units and header being drawn or held together by bolts 2 at the top and bottom edges of the header engaging the notched flanges 31 at the top and bottom of the units.

The inlet passage 8 in the header is connected by pipes 11, at opposite ends to the lower side drums 50 of the boiler, and the upper header passage 4 is connected at its ends by the pipes 9 to one or more of the boiler sections, one such connection being shown at 15. This provides a circulation between the boiler and grate. v

By means of the construction shown the units composing the grate can be readily inserted side by side and bolted to the header, and if desired anyone of them can be removed by taking out the appropriate bolts, slipplng the unit rearwardly until it clears the nipples 3, and lifting the unit clear of the header and out through the front opening or door of the furnace, without disturbing the other units or taking down the header, and the space may then be blanked off. In any event repairs can be quickly made. The tapered form of the grate units is such as to most effectively accommodate the relative expansion, and the inclination of the passages 6 and 7 assists flow through the units and prevents trapping of steam therein. The units are without joints, except the single connection with the header outside of the furnace, which is a decided advantage in furnaces of this type.

We claim:

The combination with a firebox having an opening in the face plate thereof, of hollow grate bars having openings at the outer ends thereof, a transverse header extending across the outer ends of the bars and communicating with the openings therein, said bars having one set of flanges fastened to the header and also having another set of flanges which fit within the opening in the front wall of the firebox and space said bars apart.

In testimony whereof, we do affix our signatures in presence of two witnesses.

WILLIAM M. KINGSBURY. MOSES L. FOOTE.

lVitnesses R. G. CARPENTER, B. U. RANNELLS;

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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