US947319A - Cutter-head. - Google Patents

Description

F. 0. WELLS.

CUTTER HEAD.

APPLICATION I'IL'BD MAB-{24, 1906.

Patented Jan.25, 1910.

designates the .lel t5 the axis.

" E .-STATES i:

rim-ma o. WELLS, or enzennrrann, MASSACHUSETTS, AssIeNon tro warns: Business OGMPANY, OF GREENFIELR MASSACHUSETTS, CTORZBORATION "Curran-HEAD.

To all whom it may concern:

l le it known that 1,. FRANK 0. WELLs, a citlzen of the United States of An1erica,'re-.

, siding at Greenfield,in the county ofFranlt-' lin and State of 'Massachusetts, have invented new and useful Improvements in Cut- "tor-Heads, of which the following is a speci: fication. V

This invention relates to'cutters and more.

particularly to means for securing the cutters to the cutter-head. v

vBroadly, the invention-consists in one of "its forms in providinga wedge havingtwo curved surfaces for locking the cutter in radial grooves in the cutter-head,one of wish to he understood to include cutters of all kinds, as milling cutters, taps, or

reamers. I

Referring to the drawings forming part of this applicatiorn-Figure 1 is an end elevation of' the cutter-head showing the radial grooves therein. Fig. 2 is a plan View ofthe cutter-head showing the shank and longitudinal grooves therein for receiving the cu-ttenbars and wedges. side and and elevation of one of the cutterblades, Fig. l-is an'end elevation of the cutter-head showing :the cutter-blades and securing wedges in place. Fig. 5 isa side and end elevation of the securing Wedge. Fig. 6 is a section on line 6-'6, Fig. 2.

Referring to these drawings in detail, a shank of the cutter, b the cutter-head,and c the radial and longitudinal grooves cut in the head b. V These grooves have two plane surfacesrl and e at right angles to each other for receiving the flat 'surfailiisof the cutters, and arranged paral- The surface Z of the groove "opposite the surface (Z15 a curved seini-c1rcular one and slightly inclined, as indicated by the two concentric lines 9 and h. This surface may be described as that of a conc. w The cutters 2' have two surfaces, j and I at right anglesto each other and are adapted to engage the shoulders or plane surfaces (Z and e respectively, as shown in Figs. and i 1 6, the Width of the surface being greater 1 than that of the surface d so that the cutter Specification of Letters Patent. Q Patented- Applicationfil'erl March 24, 1906., seriel Naaoaase.

radius of the c the line 0', andsf 5 e center at the point'wh re. the line 0 intersects the line g g t For the purpose of securely lockin [the f "slipping out radially of the at, the point a,

Fig. 3 is a' n the groove 0, and the' Wedg {securely locked in placeih thefgrooi e,

@- and n are v rm 7 4 1 projects beyond the periphery ofrthe cutter headas I shown at m' when in place; 'f

.The forward; or cutting surfaceiv'v lo fQthe-i cutters isformed a Curved surfacenthex .t'ifittiur being-indi ate b cutteri into the slots 0 of the cutter} sad,

I have found that by .employin'g 'a'wedgegm shaped piece havingtwo curved st rface" e having/the same radius ofcurv'at'reia e cutting i face n of the cutters, and, thewotl ler being struck from a center-0f less rad u the cutters are prevented from workingiloose aridt 70 the parts are assembled and n of'the cutter 11 While the surface If is formed? on a'shorter'ra'dius, as in'dicatedf by a 4, thecenter of the curved". surfactant being;

and on line parallel with the. line 32 but located short.distance backi of the line? and toward the c'enter of jtlie' jcutter b, as indicated at. w; The parallel lines p and w are perpendicular-to thesurf-fl Itjwilltjb:

is laced" 315:

a be Lit face or face at ofthe grooved apparent that after the cutter in, against the same,. tlttat the cutter:

heingunderstood of course-that the surfacjes cutter from working out 'of t'he'groove radi ally. by reason of the fact thatthe surface-t of the wedge engages-the overhanging port-ion ofthe cutter hcad while the curved surfaces n and s will also prcvcnt any radial relatlvei to the movement of the cutter z' wedge '1'. The wedge or plug impartsa transverse pressure of the inclinedcurved surface ofthe rooves 'c and a downward pressuretowardt is con? 10 ter of the cutter-head as well, thus securely lockingthe parts in place.

Itwill' be apparentthat by reaso11;-o'ftlie I wedge r having two curved surfaces-rs and t of different radii, and the rcentersiofithesd Jail. 25, 1910. y

re'ovesi when riven; together; Referring to Figs 415, and dofthedraW 1 'ingspthis ivedgeis indicated byr. TheT'surface a is ofthe same curvaturewas 'tlie' surface pl ed eren i liei ar 9' curved surface t'ofthe wedgepr :enga sthe on the cutter by'reason radius as the curved surface s of the wedge) will have a tendency to cause the cutter 2' to and w in Fig. 4 of the drawings simply represent the distance the centers of the two curves at and t are from each other Therefore thereis always a constant tend- 'reason'of the. location of the centers of "center of the larger curve and will always maintain the cutter firmly seated against the rangement of the wedge and cutter, and

s, as measured along a line parallel tothe the lines of resultant forces exerted by the curves being in lines perpendicular to the l to faced and parallel with each other, that the l action of the wedge r on the cutter i,- (which has a curved surface of the same move radially separating the perpendiculars p and'w until the cutter i rests firmly on the bottom of the groove. In other words there will be a relative lateral motion of the curved surfaces n" and s when assembling the wedge and cutter, The center lines 3) measured on the surface of the vwall d.

ency to lock the cutter 2' in the party Z) by curvature o'f'the conical surface 25 of the Wedge and the curved surface a of the cutter, the same being laterally spaced from each other in the cutter-head Z), with the center of the smaller curve inward of the surfaces (Z and e of the radial grooves 0.

By reason of theconstruction and arsincethe center of the curved surface 25 is at. one, side of the center of the curvedsurface wall Cl and in a direction toward the wall 6,

wedging action passing through the center of the smaller curve will fall within or at one side of the lines of resultant forces passingthroughthe center of the larger curve, whereby the cutter is securely locked by the wedge r to'the cutter-head.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States, is

l. A cutter-head having a slot therein, the slot having two .fiat surfaces at right angles each other and parallel with the axis of the cutter, a surface of the slot opposite one of the flat surfaces being conical, a cutter located in the slot and having two flat surfaces engagin the rectangular surfaces of the slot and a so a curved surface merging 'into the cutting edge and facing the conical surface of the slot, a wedge or key retaining the cutter in the head, said key having a conical surface engaging the conical surface of the cutter-head, and a curved surface corresponding in curvature with the curved surface of the cutter.

2. As an improvement in means for se curing cutters in cutter-heads including a radial slot in the head formed with a conical surface and two flat surfaces, the conical sur face producing an over-hanging lip, the cutter having a curved surface merging into a cutting edge and protruding beyond the periphery of the cutter-head, and locking means engaging the curved surface of the cutter and the conical surface. as described.

3. In a cutter, a body having a groove, provided with a side wall having its face curved in cross-section, a cutter-blade seated in the groove having a face curved in crosssection opposed to the eurved face of the FRANK O. WELLS.

Witnesses:

CHARLES N. S'ronmnn, VINNIE M. FARR.

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