US287363A - Thirds to h - Google Patents

Description

(No Model.)

P. B. CHARBONEAU.

` SAW SWAGE. No. 287,363. K Patented Oct. 23, 1883.

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PASCAL B. CHARBONEAU, CF BAY CITY, MICHIGAN, ASSIGNCR OF TWC- THIRDS TC H. A. FRASER AND J. B. BARBER, BOTH OF SAME PLACE.

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SPECIFICATION forming pare of Letters Patent No. 287,363, dated october 23, 1883.

Application filed May 10, 1883. (No model.)r

To all whom, it may concern,.-

v Be itknownthat I, PiiscALB. GHARBONEAU',

of Bay City, in the county of Bay and State of llIichigan, have invented new and useful Improvements in Saw-Swages; and Ido hereby declare that the following is a full, clear, and exact description of the invention, reference being had to the accompanying drawings, which form a part of this specication.

This invention is an improvement in sawswages; and it consists in the construction and arrangement of parts, as will be more fully hereinafter set forth, and specically pointed out in the claims.

At the present state of the art swaged sawteeth are generally formed by upsetting the tooth, so as Ito spread itsv cutting-edge, or a form of punch or striker has been used whichv forms a flattened saw-tooth. The objection to the method of upsetting the tooth is that the steel which forms the cutting-edge of the tooth is thereby inj uriously affected, as the fibers or particles of steel lose some of their cohesion,

making the steel, as it is technically called,

coarse.77 lVhere the lsaw-teeth are much worn, the operation of upsetting has to be preceded by filing, so as to bring the saw-tooth in proper shape for upsetting. The swage-tooth obtained by punching devices is weak and necessitates much filing.v Ageneral objection to all present devices of forming swage-teeth is that they all affect the cutting-line of the tooth,

which necessitates a readjustment by filing,

which in circular saws with inserted teeth is a serious drawback.

ing ysaw-teeth the cutting-line of the tooth is never affected, and the tooth is formed by an operation which is just the reverse from upsetting, and tends to refine the steel which 4o makes up the cutting-edge, instead of destroying its cohesion, as in the upsetting process.

Another advantage is that I am enabled to form a superior swage-tooth with less loss of material, as the amount of filing needed to perfect my tooth is but trifling, as will be shown and explained hereinafter.

In the drawings, Figure l shows in diagram the operation of swaging a tooth of an ordinary mill-saw. Fig. 2 shows the operation of 5o swaging an inserted tooth of a circular saw.

` filing.

lVith my means for swaglvFig. 3 is aside elevation and top plan of the same tooth after swagin'g. Fig. 4L isa side' elevation of the same tooth when perfected by In Fig. 1, A is the tooth of an ordinary millsaw, which is intended to be swaged. B is a bed tool or anvil to support the tooth. C is a die, which is provided witha segmental cylindrical face, a'. This die is forced down by pressure upon the tooth, as shown by dotted arrow. The action of the die C will be easily understood from the drawings. Its rounded portion a will form an indentation, b, on top of the tooth, pressing a corresponding amount of material toward the cutting-edge and producing the desired spread or display, as the shape of the die does not allow the material to escape'any other way. To get the proper effect, the die C is held in proper guides, or otherwise, so as to allow it to move only in the direction it is intended to act. The bottom die or anvil, B, serves as a rest only, and furnishes a large enough support and resistance against the pressure brought to bear against Vthe top die, so as not to alter or affect the cutting-line c of the saw. Its bearing or supporting surface does not extend beyond the cutting-edge, thereby aiding and Yfacilitatin g the action of the vupper die, which, with sufficient pressure, can now form an almost finished cutting-edge, which 'requires only a few strokes of a file to form a perfect chisel-edge.

In Fig. 2 is shown the arrangement of the dies for swaging the teeth of a circular saw. The form of the dies is reversedthat is, the bottom or stationary die is provided with the segmental cylindrical face, whilethe top die is provided with a plain inclined face. The top die is brought down upon the tooth, the same as in Fig. l, but the indentation will now naturally be produced on the leading face of the saw-tooth; but the result is again a swagetooth of the same conformation as in Fig. l, necessitating only a few strokes of a file to acquire the chisel-edge. It will be seen that (the saw being free to rotate) the top tool merely presses the saw-tooth onto the lower, without in the least affecting thc cutting-line of the tooth, if it is given only enough bearing-surface. This is a decided advantage of my proroo cess, especially for swagin g inserted teeth. After swaging, allY the filing needed is simply to sharpen the cutting-edge, which generally has only a little burr, if thefoperation has been performed with any care. As the tooth is provided with an 'indentation back of its cuttingedge, the iling will produce a regular chiseledge, as seen in thedrawings. This is a feature not produced by any other manner of swaging. The nature of the indentation, produced as it isby a perfectly-smooth die, is of itself a desirable feature in my swage-tooth, as it greatly facilitates the escape of the sawdust, its smoothness making it superior to any similar indentation obtained by the use of a iile.

The use of the segmental cylindrical die-face I consider an important factor, as it furnishes a tooth that presents amost favorable cuttinged ge-thatis a chisel-edge-the action of which is greatly assisted by the smooth indentation into which it leads the dbris.

whole adapted to swage a recess in the face of 35 the tooth in the rear of the Vcutting-edge and spread the metal on either side thereof, as set forth.

PASCAL B. CHARBONEAU.

Vitnesses: i Y H. S. SPRAGUE,

E. SCULLY.

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