US1455405A - Fixture for grinding beveled chisels - Google Patents

Description

May 15, 1923.

J. F. NAGLE FIXTURE FOR GRINDING BEVELED CHISELS Filed Sept. 9, 1922 Patented May 15, 1923,

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JAMES F. NAGLE, or SOUTHINGTON', ooNNEc'rrouT, Ass xenon 'ro rrrE rEcK strow &

FIXTURE FOR GRINDING, Bn-vELEn oHisELsQ 1 Application filed september 9, 19522. Serial 11005873167.

To all whom it may concern:

Be it known that I, JAMES F. NAGLE, a citizen of the United States,'residing at Southington, in the county of Hartford and State of Connecticut, have invented a new and useful Improvement in Fixtures for Grinding Beveled Chisels; and I do hereby cleclare the following, ,when taken in connection with the accompanying drawings and the characters of reference-marked thereon, to be a full, clear, and exact description of the same, and which said dra-wings constitute part of this application, and represent,

Fig. 1 a plan View of my improved chiselgrinding fixtures.

Fig. 2 a view thereof in transverse section on the line 22 of Fig. 1, showing in broken lines the slide to which it is attached and the grinding wheel with which it is used,

Fig. 3 a detached view in front elevation 'of the fixture with the chisel removed.

' hereinafter described and pointed out in the claims.

In carrying out my invention, as herein shown, I employ a'frame having a body5, and oppositely-projecting, integral arms 6, perforated at 7 for the reception of bolts 8, by which the frame is rigidly secured to'a suitable reciprocating slide 9 of ordinary construction and operation, and indicated by broken lines.

The body 5 of the said frame is formed near its forward upper edge with an upwardly-opening, outwardly-inclined chiselreceiving groove 10, extending throughout its length and adapted in width to receive chisels of the maximum thickness to be beveled, The upper face of the said body is formed with a deep recess 11, intersecting the groove 10' between the .ends thereof and provided for the reception of a pivotal camshaped chisel-clamp12, theiclampin 13 of which is beveled to correspond to th inclination from the vertical of the groove" 10 which is outwardly inclined with respect:

to the said recess 11. The said chisel clamp turns upon a heavy shouldered stud 1t,'an;d

is provided with a handle 15, by means of which it is operated. For positioning-the chisels 16 in the groove 10, the fixture is provided at its right-hand end with a stop 17,

closing the right-hand end of th-e'groove 10.

By preference, the front of the .body 5 of the frame is cut back, as at 18 and 19, for the better clearance of the grinding-wheel 20, in-

dicated by broken lines .in Figure 2, and

understood to be of any ordinary construction and to rotate in the direction of the arrow 21, at a rightangle to the line in which I the fixture is reciprocated by the slide 9, on which it is mounted. i

In using-the device, the chisel-clamp 12 is thrown, by its handle 15, into its clearance position, as shown in Figure 4, after which I the chisel 16, to be'beveled, is positioned in,

the chisel-receiving groove 10 with its end against the stop 17, after which the clamp is swung from right to left by its handle .15,"so' as to force the-back of the chisel to a firm bearing upon the outer wall of the groove,

10, as shown in Figure 2. With the chisel thus solidly gripped inthe fixture, theslide 9 is operated to move the exposed edge of the chisel into engagement'with the grinding wheel 19. The slide 9 is now, of its full throw, retracted and the chisel removed from the fixture after the clamp 12 has been thrown into its clearance position.

corresponding fixture having its positioning- 90, v Theop positeedge of the chisel is now beveled in a stop at the opposite end ofthechisel-receiving'groove thereof. I am aware thatin a variety of grinding fixtures,handled, camshaped clamps have been. used for holding the work in place. I do. not, therefore, broadly claimthe use of such clamps.

I claim: v 1. In a fixture for grinding the edges of beveled chisels, the combination with a frame formed with an inclined chisel-receiv'- the said chisel-receiving groove which is outwardly inclined With respect to the said 2. In efigctnre for, grinding the beveled.

edges of chisels, the combination With a frame hav ng an upwardly-opening,ohlseh receiving groove and" witha recess Inter-.

Q seating the same bet een-the encls thereof,

of a chisel-clamp loceted in thee-aid recess and having its clamping-edge .beveledjto correspond to the inclined onter ell of the said groove which is outwardly inclined with respect to the'said reoess'ifa'nd 71 a chisel-stop I loeated'at one endof the 'sa id'groove for po; 5 sitioning the chisels therein.

,In testimony whereof, IfhaVe signed this specification in the presenjoe vof "tifyof'snbseribing Witnesses. e' n I 1 i J. Bi hL XGLE.

Witnesses: I r I JOHN G. K0113 r HARRY J. PARLIMAN. 1

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