US325085A - Turning-tool - Google Patents

Description

(No Model.)

H. W. HUBBA'RD.

TURNING TOOL. No. 325,085. Patented Aug. 25, 1885.

'l-[ENRY XV. HUBARD, OF AURORA, ILLINOIS.

TU RNING-TOOL.

A p1 lication filed February 9, ISS.

To all whom it' may concern:

Be it known that I, HENRY W. Hummm), a citizen of the United States, residing at Aurora, in the county of Kane and State of Illinois, have invented a cert-ain new and Iniproved Turning-Tool, and I hereby declare the following to be a full, clear, and exact description ofthe same.

My invention is designed particularlythough its usefulness is by no means necessarily confined to such application-for finishing and truing up perfectly a ball or globe of any required size.

I employ the device for finishing the globevalve shells applied in large numbers and in different sizes in locomotives, and cast in brass in imperfect form, to finish or perfect which it has hitherto been the custom to use tiles operated by hand. This, however, is not only an exceedingly tedious operation, requiring for its performance a great deal of time, which must be paid for, and thus forms an important item in the matter of the cost of producing` these valves, but it is also productive of results only remotely approximating perfection, owing to the practical inability 0f human skill applied in this manner to form a nearly or quite perfect globe having a smooth and even surface.

My invention consists in the general construction of the turningtool whereby it is adapted to its purpose, and my invention further consists in certain details of construction and combinations of parts, all as hereinafter particularly set forth.

Referring to the drawings, Figure l is arear View of my improved tool represented -in operative position and operating upon a glol'ie shown to he partly finished, and adjustably connected with a suitable stem or holder having apart broken away toward its rear end to permit proper representation of the device, Fig. 2, aside View; Fig. 3, a central longitudinal section taken on the line 3 3 of Fig. l, viewed in the direction of the arrows, and illustrating the manner of adjusting the tool or cutter, Fig. 4, a central longitudinal section taken on the line at 4 of Fig. 2, viewed in the direction ot' the arrows, and showing a detail of the adjustment, and Fig. 5 a perspective view of the cutting-tool.

is the tiirning-tool or cutter, composed of cart of Letters Patent No. 325,085, dated August 25, 1885.

(No model.)

, a-blade, preferably of hard plate-steel, of the desired thickness, wedge-shaped toward its the opposite side, to form an arc of a circle of a smaller diameter and eccentric with the firstnamed circle.

B is the holder to support the tool A, and is provided toward one end with a cylindrical head, C, reduced toward its forward extremity on opposite sides, as shown at y, and provided with a transverse slot, s, formed centrally be tween the reduced portions y. rlhe slot s leads into a cylindrical opening, i', extending across its rear extremity and formed through the head C, and sci'ewihreaded to receive adjusting-screws D and D', ofwhieh one is inserted into the opening Ir froineach side of the head C.

rl`he tool A is inserted into the slot s of the head C in a manner to cause the end of its wedge-shaped portion to lie between the adjacent ends of the adj Listing-screws D and D and to bring the opening t coincident with a similar opening formed through the head C to admit aset-screw, (j, which serves to hold the tool A rmly in any adj usted position.

To operate my invention, the holder B is adj usted at its rear extremity into the spindle of a milling or other suitable machine in a manner to cause the edge ofthe tool A to project toward the table which supports the chuck for holding at a right angle to the tool the work-shown in the drawings, for exa-nr ple, in the form of a globular valve-shell, E upon which it is to operate.

The tool A is adjusted by turning the screws D and D/ in opposite directions to bring its edge as far back from the central line or axis of the center B, forming its support, as is necessary to cause it to describe a circle upon the object E of the required diameter, and when properly adjusted it is firmly secured against removal from its adjusted position by means of the setscrew q. If the ob ject, which is slowly rotated on its axis in a direction either toward or from the rapidlyrotating tool and at right angles to it, were independent of lateral supports p, like a billiard ball, for example, in which case other means than those indicated in the drawings for supporting it in its rotation'would have to be provided, the circle to be described upon it by the tool A could pass through opposite diametrical points of the surface of' the work; but in the ease of globular valve-shells E, which are ordinarily provided with tubular projections, p, the circle, if these project from opposite sides of the shell, as shown, must be described between them, and, preferably, in order to perform the work without t-he necessity of readjusting the object E, in a manner to cause it in each rotation to reach the angles ofjunction ofthe shell and projections.

To understand the operation, it must .be borne in mind that the tool A is revolved rapidly around the axis of the spindle with which it is connected, through the medium of the headed holder B, in the lateral direction, which would bring the baclm'ard-projectiug bevel x of' the cutting portion into contact with the work, while the work E is slowly rotated ou its axis either toward or from the cuttingtool, whereby a spiral-shaped circle must be cut cleararound the object, affording asinooth and even surfare upon it.

Wvhcre the tubular projections diverge from adjacent points of the shell, as is sometimes the case, one or more unfinished spots may be left near them, which will have to be finished by filing.

As hereiubefore mentioned, the operation of my tool is not necessarily conned to producing or finishing and truing up77 globular surfaces, for it may be employed, by proper' adjustment Aof a tool slightly modified by in creasing the curvatures of the concave and convex sides, to nish the curved surfaces of elbows in tubes presented lengthwise at a proper angle to it to cause it to pass through the same point on the under side of the bend in each olj' its revolutions.

By reversing the tool in its holder, to cause the edge to project in a direction opposite to that shown in the drawings, a very practicable device is afforded for milling out the interior surfaces of cylindrical holes.

Under certain conditions of work it may be desirable or practicable to employ two tools, A, facing each other upon the same center, adjustable in the manner already described of' one, and such modification is included in my invention. It is thought, however, that as one may always be used, and two only upon certain kinds of work, more than one will seldom be required.

Although the concavo-convex 'form of' tool shown and described is the one preferred, any other form of tool may be used whereby the tool will be deected from the line of axis of its rotation and its forward extremity provided withthe cutting-edge reflected toward the line of axis of rotation, thus causing the edge to be presented to the work77 during the entire revolution of' the tool, and such other forms are included in my invention.

Vhat I claim as new, and desire to secure by Letters Patent. is-

l. An adjustable turning-tool comprising a blade, A, having an edge, m, in combination with a rotary holder upon which the turningtool is pivotally mounted, and adjusting means, substantially as described, upon the holder to adjust the turning-tool to various positions with relation to the holder and work, as set forth.

2. Au adjustable turning-tool, A, comprising a blade having the sides of the body eccentrically concave-convex to afford an edge, sr, toward its forward extremity, and provided with an opening, t, toward its rear extremity, in combination with a holder, B, provided with ahead, C, having a slot, s, to receive the rear extremity-of the tool, and openings coinciding with the opening t in the adjusted tool. containing a set-screw, q, and a longitudinal opening, o', along the base ofthe slot s, containing adjusting-screws D and D', the whole being constructed and arranged substantially as described.

HENRY WV. HUBBARD.

In presence of- J. P. Cass. CHAs. F. TYLER.

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