US499619A - Alfred weed - Google Patents

Description

(No Model.)

A. WEED.

HASP.

No. 499,619. Patented June 13, 1893.

Alf/urn i ,9

UNITED STATES PATENT OFFICE.

ALFRED \VEED, OF TARRYTOWN, NEW YORK.

RAS P.

SPECIFICATION forming part of Letters Patent No. 499,619, dated June 13, 1893.

Application filed July 18, 1891. Serial No. 399,965- (No model.)

To all whom it may concern.-

Be it known that I, ALFRED WEED, a citizen of the United States, residing at Tarrytown, in the county of WVestchester and State of New York, have invented certain new and useful Improvements in the Manufacture of Rasps, of which the following is. a specification.

My invention relates to certain improvements in rasps and consists in providing the same with teeth of a peculiar form, as set forth hereinafter and as illustrated in the accompanying drawings, in which:

Figure 1 is a plan view showing, greatly magnified, a tooth of a rasp of ordinary form. Fig. 2 is a section on the line 2-2, Fig. 1. Fig. 3 is a plan showing the form of the tooth in my improved rasp. Fig. 4 is a section on the line ii, Fig. 3. Fig.5 is a View showing the method of cutting the ordinary tooth. Fig. 6 is a view illustrating the method of cutting a tooth in accordance with my improvement.

In the manufacture of rasps it has heretofore been usual in most instances to out or form the teeth by means of a chisel a, which is applied to the file blank X, in an inclined position as illustrated in Fig. 5, and the chisel is then forced forward in the direction of its length indicated by the arrow 5, and as it reaches the termination of its moveinentit is swung outward as indicated by the arrow 6. As the result of this operation the tooth b, that is thus formed is rounded upon its back surface, as illustrated in Fig. 1, and the upper forward edges approximate very closely to a straight line Y, Fig. 1, extending transversely of the file plate while the forward face 7, is in a plane to, Fig. 2, which is very nearly vertical and the point 8, turns backward slightly, as illustrated in Fig. 2.

In making my improved rasps the chisel A, is at an angle to the blank its cutting edge forward but instead of being driven into the blank Fig. 6, in a direction longitudinal to the chisel is forced downward in the direction of the arrow 9, at right angles to the face of the blank and is also simultaneously swung to carry the heel or upper end of the chisel downward in the direction of the arrow 10, instead of upward in the direction of the arrow 6, Fig.5, as in ordinary cutting. As a consequence of this method of operation each tooth is formed from a piece forced up from a V- shaped recess having a straight inclined bottom 0, and the tooth 0, Figs. 3 and 4 which is produced differs very materially from the ordinary tooth both in its construction and operation. Thus, the upper face of the tooth instead of being rounded like the tooth b, more nearly approximates the shape of a section of a cone, and the forward upper edges 12, 12, coincide with converging lines to, u, that meet at a comparatively sharp angle and the inner face 14, coincides very nearly with a' flat plane, while the point 13, instead of being turned back projects forward. The rasp having teeth of this shape has a much greater cutting capacity than an ordinary rasp and the wearing of the edges in use does not have the same degree of efiect in duiling the point as is the case with ordinary teeth so that the teeth remain sharp for a longer time and the durability of the rasp is greatly increased.

I claim As a new article of manufacture a rasp, provided with teeth having inclined forward faces 14 and upper forward edges 12, 12, c0- inciding with lines converging to a sharp point and approximating a conical form at the back, and with V-shaped recesses having straight inclined bottoms 0, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALFRED WEED.

WVitnesses:

J NO. R. WEEKS, L. D. JERMAN.

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