US687237A - Lathe-tool and holder. - Google Patents

Description

Pateted Nov. 26, mol."

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LATHE TOOL L (Applicatio me r. 1, 19

(No Model.)

Y atroz-M43 i UNITED STATES PATENT CEEICE.

CALVIN JACKSON, OF READING, PENNSYLVANIA.

LATHE-TOOL AND HOLDER.

srEcrFIcA'rIoN forming part of Letters Patent No. 687,237, dated November 26, 1901 Application tiled March 1, 1900. Serial No. 6,937. (No model.)

To all whom t matt/concern- Be it known that I, CALVIN JACKSON, a citizen of the United States of America, and a resident of Reading, in the count-y of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Lathe- Tools and Holders, of which the following is a specification.

My invention relates more particularly to lathe-tool holders and cutters; and my object is to provide asimple, inexpensive, and easilymaintained form of cutter-tool in connection with a holder, and clamping means adapted to permit the ready adjustment of the cutter to suit various conditions and the easy and convenient fastening or loosening of the same.

The invention is fully described in connection with the accompanying drawings, and the novel features are pointed out in the claims.

Figure lis a side elevation, partlyin section, of my complete devicein preferred form, the clamping-wedge being shown loosely in position. Fig. 2 is a plan view of the stock alone. Fig. 3 is an end View lookingin the direction of the arrow, and Fig. 4 is a similar view showing the cutter adjusted rotatively from Figs. l and 3 position.

A represents a holder or stock, which is out from a rolled vbar of steel of rectangular section, the parting cut beingat such an angle as to form parallel end faces ots` and a5, the former of which provides proper clearance below the cutter. The upper corner of the outer end is cut away to a much greater angle, forming an inclined face a2, thus providing ample clearance for the chips and place for fastening and loosening the cutting-tool. Through this face of* opens a round receiving-hole a for this tool, said hole being drilled rearward with a downward incline, as shown. Its inclined lower wall about meets the intersection ofthe oppositely-inclined end faces a2 0,3, and a reduced extension of it (marked ct') opens through the bottom of the stock, so as to permit of access from the rear.

The cutter B is designed to be made by simply cutting off from a rolled bar of toolsteel, which may be readily produced, a proper length for a cutter and then grinding the end b to the desired shape. Its half-round cross section is adapted to loosely iit the round receiving-hole a of the stock. In order to adjustably secure it in the latter, a similar half-round filling-piece C is employed,

thus occupying the hole as fully as though r b the cutter were made out of a roundbar, but avoiding the expensive and troublesome grinding which the latter form would necessitate, while at the same time making it possible to fasten and release the cutter far more conveniently and satisfactorily than is pracl ticable with a solid round cutter, as will clearly appear from the preferred means shown in the drawings.

-Insteadofemployingoneormore set-screws j engaging a screw-threaded hole or holes inenabled to employ with advantage a wedgen piece E between the half-round cutter and filling-piece. For this purpose I taper the forward end of the filling-piece so as to provide an inclined face c', preferably terminating in the normal dat face c some distance forward of the rear end of the iilling-piece, so that the latter when inserted in the hole a with the cutter B will be positively held up at the front end so as to conveniently admit the wedge-piece E. In adjusting the cutter either longitudinally or by turning it for right or left hand use, as indicated in Fig. 4, the wedge is withdrawn. When adjusted, it is forced into place,thus spreading the parts and firmly clamping the cutter. When it is desired to loosen the latter, it may be accomplished as heretofore in similar devices by means of the previously-mentioned extension o. of the hole a through the base of the stock, which permits of access to the rear end of the cutter. To provide for accomplishing this result more conveniently and satisfactorily, however, I provide a movable stop for the rear end of the filling-piece C, against'w'hich it may bear while the wedge E is forcedinto place, but which will permit an inward movement of the lling-piece for the purpose of releasing the wedge when desired. This movable stop is preferably made in thelform of a yielding spring I), which bears against the square bottom a4 of the hole a above the reduced bottom passage o and which when the cutter is fastened by the forcing in of the IOO wedge will normally tend to press the fillingpiece C outward, and thus make the fastening more secure. When itis desired to loosen the cutter, however, a moderate tap upon the outer end c2 of the filling-piece will cause the spring-stop D to yield and permit a momentary inward movement tending to release the wedge E, followed by a quick return tending to carry the loosened wedge outward. Two orthree such taps will serve to entirely loosen the parts so as to permit their free removal or readjustment.

The round receiving-hole for the cutter is not only easily formed by drilling, but it may also be of a size little less than the thickness of the stockA without objectionably weakening the latter, the side walls being of minimum thickness onlyl in the transverse axial plane of the hole. It also permits the use of a wide-faced cutter B capable of rotary adjustment, whereby an extended cutting edge may be brought into service and the necessity for separate right and left shapes is dispensed with. The economy of first cost and maintenance is important as is also the convenience in fastening andlooseningthe cutter.

What I claim isl. The combination with a tool holder or stock having a plain cylindrical receivinghole, of a cutter of half-round cross-section fitting said hole, and clamping means located entirely in said cylindrical hole between the wall thereof and the flat face ot' said halfround cutter for adjustably securing said cutter in the receiving-hole.

2. The combination with a tool holder or stock having a cylindrical receiving-hole, of a cutter of half-round cross-section fitting said hole, and clamping means comprising a separate filling-piece and a wed ging device located entirely in said cylindrical hole between the wall thereof and the fiat face of said halfround cutter for adj ustably securing said cutter in the receiving-hole.

3. The combination with a tool holder or stock having a cylindrical receiving-hole, of a cutter of half-round cross-section fitting said hole, a separate filling-piece of similar crosssection but tapered toward one end, and a wedge-piece fitted between said tapered filling-piece and the cutter and adapted to secure the latter in adjusted position.

4. The combination with a tool holder or stock having a cylindrical receiving-hole, of a cutter of half-round cross-section fitting said hole, a separate filling-piece of similar crosssection having the forward portion only thereof tapered toward the outer end, and a Wedgepiece fitted between said tapered filling-piece and the cutter and adapted to secure the latter in adjusted position.

5. The combination with a tool holder or stock having a cylindrical receivinghole, of a cutter of half-round cross-section fitting said hole, a separate filling-piece of similar crosssection but tapered toward the outer end, a wedge-piece fitted between said tapered filling-piece and the cutter, and a movable stop in said hole for the inner end of said tapered filling-piece.

6. The combination with a tool holder or stock having a cylindrical receiving-hole, of a cutter of half-round cross-section fitting said hole, a separate filling-piece of similar crosssection but tapered toward the outer end, a Wedge-piece fitted between said tapered filling-piece and the cutter and a spring-stop for the inner end of said tapered filling-piece.

Signed by me at Reading, Pennsylvania, this 26th day of February, 1900.

CALVIN JACKSON.

Witnesses:

W. G. STEWART, CAMERON E. SrRAUss.

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