US828996A - Soot-scraper. - Google Patents

Description

No. 828,996. PATENTBD AUG. 21, 1906.

A. H. BLACKBURN.

569T SGRAPER.

APPLICATION FILED 11,111.25. 1905 wumtoz no: "III" I'IIIIII ca, mllwmcmn, n, c

ARTHUR H. BLACKBURN, OF MATTEAWA N, NEWV YORK.

SOOT-SORAPER.

Specification of Letters Patent.

Patented Aug. 21, 1906.

Application filed March 25, 1905. Serial No. 251.954.

To all whont it may concern.-

Be it known that I, ARTHUR H. BLACK- BURN, a subject of the King of England, residing at Matteawan, in the county of Dutchess and State of New York, have invented certain new and useful Improvements in Soot-Scrapers, of which the following is a specification, reference being had to the drawings accompanying and forming part of the same.

My invention relates to reciprocating sootscrapers of the eneral type shown in the patent to Edwar Green, No. 513,917, for dislodging soot from the ipes of fuel-economizers, air-heaters, and ot er ap aratus in which pipes are exposed to gases of combustion.

The object of my invention is to improve such scrapers, so that they will produce a clean scrape and not leave portions of the pipe covered with soot, and also to prevent the soot dislodged from the pipe from accumulating between the pipe and the scraper, thereby lessening the effectiveness of the latter.

To these ends the invention consists in the the novel features, arrangements of parts, and combinations of elements hereinafter described, and more fully set forth in the claims.

Referring now to the drawings, which show convenient embodiments of the invention, Figure 1 is a perspective view of one section of a scraper; and Fig. 2 is a perspective view of a section, showing a slightly different construction.

Each scra' er-section consists, essentially, of upper an lower cutters 1 2, each being a segment of a ring joined by a connecting-bar 3. Each cutter is concave on its inner side to provide 11 per and lower cutting edges 4 5. The lower edge 5 is continued upward on the connecting-bar 3 by a trian ular or pointed extension 6. The effect of t 's construction is to throw the soot to either side instead of allowing it to accumulate on the edge 5 in the space between the bar 3 and the pipe upon which the scraper operates, as sometimes happens with scrapers in which the cutting edge lies wholly in one plane-that is, runs strai ht across the connectin -bar. It can also e sharpened readily, as t e edges of the pointed extension can easily be reached by a grinding-tool, as a file or emery-wheel.

Fig. 2 shows the upper or lower half of a modified construction. In this case the pointed extension 7 extends farther up the connecting-bar 8, and to save weight and metal the center of the same is made open, as shown at 9.

Both forms are simple and cheap to manufacture, being easily made by casting in the usual way. 1

What I claim is 1. In a soot-scraper, the combination of a connecting-bar, a ring-segment at the end thereof arranged transversel thereto and having a scra ing edge provi ed with an ex tension of su stantially triangular form extending backward upon the connecting-bar, providing a continuous edge from the ends of the ring-segment to the point of the said extension, as set forth.

2. In a soot-scraper, the combination of a pair of ring-segments having scraping edges, and a connecting-bar therefor, one of said ring-segments having a substantially triangular extension of its cutting edge, extending upon, and toward the center of, the connecting-bar, providing a continuous ed e from the ends of the said ring-segment to t e point of the extension, as set forth.

ARTHUR H. BLACKBURN.

Witnesses IRVING E. ORMSBEE, HOWARD C. DUFF.

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