US1639488A - Cutter head - Google Patents

Description

Aug. 16919270 J. E. COVILLE CUTTER HEAD Filed .Auz. 26, 1926 inven o JohnE. Camille,

Patented Aug. 16, 1927.

JOHN E. GOVILLE, OF SWAMIPSCOTT, MASSACHUSETTS, ASSIGNOR OF, ONE-THIRD TO PATENT OFFICE.

THEQDORE w. MCNICHOL, AND ONE-THIRD 'ro THOMAS T. McN cHoL, Borrr'or SWAMIE'SCOTT, MASSACHUSETTS.

' CUTTER HEAD.

Application filed August 26,1926. Serial No. 131,781.v

This invention relates to cutter heads particularly adapted for use in lathes for shaping lasts and similar articles, the object being to produce a balanced cutter having means for removing superfluous stock from the block prior to the actual shaping thereof, and provided with means whereby said head may be mounted directly. upon the end of a rotary shaft.

These objects are attained by the mechanism illustrated in the accompanying draw- For the purpose of illustrating the invention, one preferred form thereof s, illustrated in the drawings, this form having been found to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organized, and the invention is not limited to the precise arrangement and organ ization ofthese instrumentalities as herein shown a-nd described except as required by the scope of the appended claims.

Of the drawings: Figure 1 representsan end elevation of a cutter embodying the principlesof the present invention. Figure 2 represents a section of same .on line 2, 2, on Fig. 1. V Figure 3 represents a sectlon on line 3, 3,

onFig.2.

Figure 4 represents .a section on line 4, 4, on Fig. 2.

Figure on Fig. 2,'and

Figure 6 represents'a. section on line 6, 6, on Fig. 2, with the cutter blades and securin bolts therefor removed, and the nut for seduring the head tothe shaft omitted.

Similar characters indicate like parts throughout the several figures of the draw- 1n 5.

i [n the -drawings10 is a revoluble shaft having a cone-shaped portion 11v near one end from which extends outwardly a threaded portion 12. I

. The block 13 of the cutter head has a conical bore which is fitted to the coneshaped portion 11 which has its greatest diameter at its inner end.

The block 13 is provided with four radial slots 14 in its outer face, said slots being] of 5 represents a section of line 5, 5,

different depths and the block 13 on its oppositeend is provided with aprojecting cylindrical hub 15.

In each slot 14.- is fitted a shaping blade I 16, these blades being in different planes perpenchcular to the axis of rotation 'of'the block 13 and the outer ends of said blades are curved'toward the inner end of the block 13 and over the periphery thereof.

The block 13 is provided with a peripheral shoulder 16* between which and the inner end of said block is a cylindrical. portion 17 on which are mounted side by side two bal-I ancing rings 18. 1

Each ring 18 is eccentric as shown in the drawings one side being much heavier than the other side. Y

. The combined thickness of these rings 18 -isgreater than the length of said cylindrical portion 17 so that the inner ring projects beyond the end face of the cylindrical portion 17 in contact with an annular'plate 19 mounted upon and movable endwise of the hub 15. I

The eccentric rings 18 are provided with peripheral spanner holes 20 by which said rings may be accurately adjusted about the axis of the block 13 to balance theweight of Y I the heavier blades 16.

Through the block 13, annular. plate 19 and blades-16,extend bolts 21 each having a head 22 hearing against the outer face of a blade 16 while the opposite end has a nut- 22" threaded thereto.

When the rings 18 have been adjusted properly they may be clamped to the shoulder 16 by turning the nuts 22* and forcing the plate 19 toward said shoulder.

The extreme outer end of shaft 10 is threaded and has mounted thereon the nut 2 1, having on its inner end an annular flange 25 which extends into a socket in the block 13 and bears against'theend wall thereof,

thereby forcing said block further on the cone portion 11 oji'xthe shaft 10. 7 4

The :nut' 24: has two scoring blades formed integral therewith which act upon. the work ahead of the cutting blades 16, removing parts of the wooden blocks and permitting the actual shaping of thelasts to be i more readily accomplished by the cutting blades 16. The outer endsof the scoring blades 26 are curved with their facestoward the block 13 further from the axis of shaft 11 than their outer faces.

The nut 24 is so threaded to the shaft that when the blades 26 come into contact with the work the strainthereon will tendto screw the nut further on the shaft and at the same time crowd the block further on the cone portion 11.

The block 1.3 is provided with threaded: holes 27 to receive screws forming a part of a tool by which said block may be withdrawn from the tapered portion 11 of the shaft to;

This tool forms no part of the present invention and therefore is not shown or described. v

By providing the cutter headwith the balancing rings 18, 18 the cutter head will rot-ate evenly; I

Moreover, the means of securing the cutter head to the rotating driving shaft 18 greatly simplified in 'applicants construction.

By providing the scoring blades 26 much of'the' material of the work may be removed before the cutting and shaping blades come into operation.

The simplification in construction of the cutter head greatly reduces the'cost of manufacture and by reducingto a minimum the number of movable parts'there are fewer elements to get out of order and interfere with the proper operation of: the lathe.

' It is believed that the-operation and many advantages of the invention will be understood readily without further description;

Having thus described my invention, I claim:

1; The combination. with: a rotary shaft; a head mounted on the end thereof and pro vided with radial slots in the-outer face thereof at varying distances from its inner face; cutter'blades disposed lHISZLlCl slots and secured to said head; said blades having cutting edges beyond the periphery of said head; and a nut threaded to the end of said shaft and bearing against the outer end of said head.

2; The combination with. a. rotary shaft; a head mounted on the end thereof and provided with four radialslots inthe outer face thereof at varying distances from its inner face and perpendicula-r'to each other; cutter blades disposed: in said slots and secured to said head, said blades having: curved cutting edges beyond the periphery of said head; and a. nut threaded to the end of said shaft and bearing against the outer end of said head.

3; The combination with arotary shaft; a headinounted 011 the end thereof and provided: with radial slots in the outer face thereof; cutter blades disposed insaid slots with; curved. cutting edges beyond the periphcry of: said head; a bolt securing each cutter blade to said head; and a nut threaded to the end of said shaft and bearing against the outer end of said head.

4. The combination with a rotary shaft; a head mounted. on the end thereof and provided with radial slots in the outer face thereof; cutter blades disposed in said slots; an annular plate surrounding a hub on the inner end of said head; a bolt extending through each cutter blade and said plate;

a nut threaded. to the inner end of each bolt;

and a nut threaded to the end of said shaft and bearing against the outer end of said head. r

5. The combination with a rotary shaft; a head mounted on theend thereof and provided with a plurality'of radial slots all formed in the outer face thereof; cutter blades disposed in said slots and secured to said head; each cutter blade having? at its outer end a cutting edge curved over the periphery of said head and: said cutting edges beingin planes overlapping. each other; and a nut threaded to the end of said shaft and bearing against the outer end of said head.

6. The? combination with: a rotary shaft;

a head: mounted on theend thereof and provided with a plurality of radial slots all formed in the outer face thereof; cutter blades disposed. in'sai'd' slots and secured to said" head, said: cutter blades having at their outer ends cutting edges curved over the periphery of said head and terminating at different distances from the inner end of said head. said cutting edges-being in: planes overlapping each other; andv a nut'threaded to the end of said shaft and bearing against the outer end of said head.

7. The combination with a rotary shaft having: at one end an axially disposed threaded extension; a head mounted near one end of the shaft provided with aplurality of shaping blades; a nut on said shread'ed extension and locking said head: tosaidshaft; and a plurality of scoring blades integral with said nut with the outer faces of their outer ends curved towards said head.

8. The combinationv with a rotary shaft having: a: cone-shaped portion near its outer end; a head with a conical bore'fitted to said cone-shaped portion and provided with a plurality of radial slots all formed in the outer face thereof; cuttei blades disposed in said slots and secured to said head, said blades having: at their outer ends curved cutting edges extending toward' the opposite wardly therefrom; a head with a conical bore fitted to said cone-shaped portion; cutter blades secured to said head and projecting radially therefrom, said blades having curved cutting edges beyond the periphery of said head and in overlapping planes; and

a nut on said threaded portion adapted to force said head towards the larger end of said cone-shaped portion and lock it thereto.

10. The combination with a rotary shaft; a head mounted thereon and revoluble therewith having a shoulder near its outer end and a cylindrical portion between said shoulder and its inner end; cutter blades radiating from said head; an annular plate surrounding a hub on the inner end of said head and revoluble therewith; two eccentric balancing rings on said cylindrical portionand independently adjustable about the axis thereof, the combined Widths of said eccentric rings being greater than the length of said cylindrical portion; and means carried by said head for moving said annular plate towards said shoulder and clamping.

said eccentric rings to prevent movement thereof about theaXis of said head.

Signed by me at Lynn this 16thday of August 1926.

JOHN E. COVILLE.

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