US817451A - Thread-cutting tool for lathes. - Google Patents

Description

PATENTED APR. 10, 1906.

0. G. SIMMONS. I THREAD CUTTING TOOL FOR LATHES APPLICATION FILED MAR.14,1905.

o a E6 fix, W.

06k 6: 0270/70/16 Inventor,

b y I Attorneys.

siniple, t oroughly with t e present invention.

.lordinary cutter. is a head 4 carrying a graduated sector 5 the OLIVER o. SIMMONS, OF WASHINGTON, DISTRICT OF COLUMBIA.

' "THREAD-CUTTING TOOL FOR LATHES- Specification of Letters Patent.

Patented April 10, 1906.

Application filed March 1 1, 1906. Serial No. 250,108.

tools for lathcs.

The ob'ects of the invention are in a ready feasible, and practical manner to insure a olute steadiness of movement of the work, thereby to produce a smooth and perfect thread, to obviate chattering of the work and dig ing thereinto of the (butter, to facilitate the s arpening' of the cutter Without destroying-or changing the angles of its cutting edges, to render unnecessary any adjustment or resetting of the cutter when replaced after a removal for any purpose, to ada t the tool for cutting threads either right or eft hand of any deslred lead with the same cutter, and generally to improve the construction of such tools and render their operation more effective and general in character. a

With theabove and other objects in view,

as will appear as the nature of the invention is better understood, the same consists in the novel construction and combination of arts of a thread-cutting tool for lathes, as Wlll be hereinafter fully described and'claimed.

In the accompanying drawings, formin a part of this specification, and in which lire characters of reference indicate corresponding parts, Figure 1 is a view in perspective of a com lete toolconstructed in accordance Fig. 2 is a vertical longitudinal section, on an enlarged scale, taken through the center of the. tool. Fig. 3 is a view in end elevation of the cutter, showing more 1particularly its contour in cross-section. 4 is a top plan view of a portionof thetoo The invention embodies a cutter-sup ort, designated generally 1, and a cutter-ho der, desi nated general y 2, these arts being ma e of any material suited to t e purpose.

The cutter-sup ort embodies a shank 3, which is rectangu er in cross-section and is adapted to engage and be clamped in the slide-rest of a lat in the same manner as an Combined with the shank shank, head, and sector bein formed. integral in order to secure the requisite rigidity to render the tool thorou hly effective for the pur oses designed. T 1e head is Wit 1 a smoothlon 'itudinal bore 6, m which fits the stem 7 of the cutter-holder, the stem provided bein of a length to project beyond the head,

and aving the extended portion threaded to be engaged by a locking-nut 8, which operates to secure the cutter-holder at any desired adjustment relatively to the cutter-suport. 1 P The cutter-holder embodies the stem 7, a scale-arm 9, provided with a vernier-scale and commensurate in height with the sector 5, and a cutter-clamp consisting of two spaced arms 10, all these parts being integral. The opposed faces of the arms 10 are cut away to form a cutter-rest 11, and the wall of each rest is provided with an angular rabbet or channel 12 to receive the base 13 of the cutter 1 1, the cutting end 15 of which is herein shown as triangular in cross-section. The walls of the rest 11 are disposedon an outward-diver ing an leof about ten degrees to the perpendicular face of the sector, thereby insuring the proper engagement between the point 0 the cutter and the work.

The arms 10 are causedto im huge the cutter by a ceive thirty graduation-marks 19 on each side of the perpendicular, (indicated by an extended graduated mark 20.) The sides of the scale-arm, as shown, are parallel with each other, and its face 21 bears nine division-inarks 22 evenly spaced, three hundred to a circle, and by the employment of the two different sets of'graduation-marks the cutter may be set at any angle and also at any deee plus twelve, twenty-four, thirty-six, or orty-eight minutes to the right and left or the per endicular of the sector within the limits 0 the acluation-marks, thus permitting aright or eft hand thread of any lead not greater than the diameter of the screw to be cut with the same cutter and holder.

It Will be seen from the foregoing description that the tool of the present invention- In using the tool the Work is driven backward instead of forward, as usual, the cut- I moved and sharpened without destroying or changing its cutting-an 1e, and inasmuch as the cutter-clamp has 0 y an an ular move ment the cutter may be repositloned Without requirin any resetting or adjustment, such as Woul be necessary with the ordinary form of cutter-holder.

Havin thus described the invention, what is claime is- 1. A tool of-the class described comprising a cutter-support embodying a shank, a head,

and a graduated sector disposed at right anles to the shank, and a cutter-holder emodying a stem rotatably secured in the head, a graduated scale arm coacting with the sector and a cutter-clamp.

' 2. A cutter-holder comprising a shank, a tool-clam ing device mounted in the shank and angu arly adjustable thereon on an axis parallel with the shank, and provided with means for holdinj a bit or cutter transversely of the axis, a gra uated sector at right angles to the shank, and an arm on the tool-clamping device havin 'a vernier thereon.

n testimony that I claim the foregoing as my own I have hereto aflixed my signature in the presence of two Witnesses.

OLIVER G. SIMMONS. Witnesses:

G. B. PowERs, J. H. JooHUM, Jr.

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