US34866A - Improvement in files - Google Patents

Description

UNITED STATES PATENT OFFICE.

MILTONYD. VHIPPLE, OE CAMBRIDGE, ASSIGNOR TO THE 'IIIPPLE FILE MANUFACTIIRING COMPANY, OF BALLARD VALE, MASSACHUSETTS.

IMPROVEMENT IN FILES.

Specification forming part of Letters Patent No. 34,866, dated Aprill, 1862.

To @ZZ whom, t may concern.-

Ie it known that I, MILTON D. WHIPPL-E, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented. an Im'- proved File, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings', making part of this specification, in which- Figure l is a view of a round or rat-tail file of my improved manufacture; Figf, a,

view of portion of the same enlarged; Fig. 3, a View of a half-round file, the curved sur- -face of which is cut in the same manner as the rou/nd tile. l

Round files and those which Iare' partly round or have one of their faces curved around the axis of the file are usually made with the frows of teeth extending in straight lines froui one end of the file to the other. EachV tooth in these lines being formed by a .cut in the metal of the file-blank which is on` such curved surface from one 'endetfthe `tile' toward thev other. That others skilled in the art may-'understand `'and 'use -my invention, Iwill proceed to describe the manner in which l have carried it" out.

In the said drawings the t-eetha` 7J c d, dsc., Figs. 1 and 2,1 wind spirally around the le from one end to the other of it. 'lo produce this, the blank` is revolved by suitable machinery around its axis while the cutting of the teeth progresses from one'end of the file toward the other. The machine which I have found most convenient fortsis purpose is that for which Letters Patent of the United States Were granted me the 7th day of October, A.

D. 1856, suitable gears being attached to the spindle which carries the blank to give it the required rotation.

The file` shown in Fig. 3 may have its rounded surface vcut in the saine machine, three tiles being secured to the faces of a triangular mandrel, Vwhich is then revolved slowly as the cutting-proceeds. 'tha tile so et (either round or part round) a round hole may be tiled or a' curved surface be made smooth, as the rowsof teeth do not lie in lines parallel with the direction of cut of the file and do lnot tend. to score the surface being filed into grooves.

What I claim as my iiryention, and desireto secure by Letters Iatent4 as anew article of manufacture, is-

A round or curved surface'ie the teeth of which arecut in rows winding spirally, suhf stantially as specified.

MILTON D. WHIPPLE Witnesses: i

THOS. R. ROACH, f EDMUND MASSON.`

Images