US954447A - Last-lathe. - Google Patents

Description

M. H. LYONS.

LAST LATHE.

APPLIOATION FILED APR. 28, 1909.

Patented Apr. 12, 1910 2 SHBETB-BHEET 1.

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M. H. LYON S. LASTLATHE.

APPLICATION FILED APR. 28, 1909. 954,447.

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Patented Apr. 12, 1910.

' To all whom it may concern:

UNITED STATES PATENT OFFICE.

MICHAEL H. LYONS, OF BROCKTON, MASSACHUSETTS.

LAST-LATHE.

Specification of Letters Patent.

Patented Apr. 12, 1910.

Application filed April 28, 19,09. Serial No, 492,646,.

Be it known that I, MICHAEL H. LYONS,

' a citizen of the United States, residing at In turning certain irregular shapes such as modern shoe-lasts, special curves are met with which it is practically impossible to 7 turn properly with the present turning lathe. For instance, the modern tendency in last manufacture is to have a very narrow cone, and in some styles of lasts there are various sharp bends,- and it has been found necessary to do considerably hand shaving on lasts at those points because the pattern wheel and the rotary cutter of the ordinar lathe has been unable to follow into an reproduce these sharp curves. "Accordingly my invention aims to provide means for overcoming these defects. To this end I use a small pattern wheel and small cutterhead, which are set obliquely to the work, all as will be more a parent from the following description, re erenco being had to the accompanyin drawings, in which I have shown a preferre embodiment of the invention. e I

In the drawings, Figure 1 shows in front elevation a regular Kimball & Sprague lathe, having my invention applied thereto;

Figs. 2 and 3 are views in side elevation and cross-section respectively of a last, showmg the special work which it is the object of my'invention to accomplish; Fi' 41s a cross-sectional detail showing in si e elevation the arrangement of the pattern wheel supporting mechanism; Fig. 5 is a fragmentary top plan view of sufficient parts of the machine to make my invention readily understood; Fig, 6 is an enlarged cross-sectional detail similarto Fig. 4, showing the relative position of the cutterhead and its my invention is applicable to any of the operating mechanism; and Fig. 7 is a fragmentary View in side elevation of said out well-known lathes. As herein shown, a.

model 1 is held in place in usual manner inthe swing frame 2 of the machine, said swing frame being ivoted at 3. to the main frame 4 of the mac inc and driven b belts 5, 6, 7, and the work or last bl 8 is mountd in usual manner at the opposite end.

of said swing frame. I deem it unnecessary to go into a detailed explanation of the last lathe itself as. all the arts, and operation thereofare old and wel -known. v

Cooperatin with the model is a pattern wheel 9 whic is substantially the same as axis is oblique to or out of parallelism with the axis of rotation of the model or pattern 1.. This small pattern wheel 9 is journaled at 10 in the angular-1y bent or oblique 'end 11 of a slide support 12 held adjustably bya heretofore excepting that it is small and its hand screw 13 in dove-tailed ways 14 of an upright frame 15 mounted to reciprocatev longitudinally of the machine in usual manner on ways 16.

Cooperating with the last block 8 is a I small cutterhead 17 of the same diameter and peripheral shape and size as the pattern wheel 9 andset to rotate at the same oblique angle as the pattern wheel, being herein shown as mounted at the end of the axis 18 journaled at 19 in standards 20 extending u wardly from a carriage 21 mounted to slide longitudinally of the lathe on ways 22 the same as the pattern carriage 15. The cutter-head may be driven by any suitable means, but to adapt it to the type of lathe herein shown I have provided a pulley 23 on the shaft 18. connected by a belt 24 to a pulley 25 on a shaft 26 set obliquely on a stand ard 27 and carrying a small pulley 28 from which abelt 29 extends over an idler or direction pulley 30 to the usual driving drum 31. The cutter carriage is provided with a usual rack 32 driven by a toothed pinion 33 and a train of gears 34, 35, 33, from a belt pulley 37, and the cutter carriage and pat-.

tern wheel carriage are connected in usual manner by bars 38, 39,. adjustably secured by a hand screw 40, andby grading-meow anism 41, all of which being the same as heretofore it is unnecessary to explain. 3

The cutterhead has at its front side a noselike portion 42 held adjustably in the rest of the. outterhead h a'set screw 43 which pre- 1 plicable to the various last-turning lathes,

- same as heretofore, but, because of the spe- 47, 48, 49, Figs. 2 and 3. If the axes o ahead of the finishing 'cial features which constitute my invention, it becomes possible to turn a last even of the extreme shapeshown in Figs. Qand 3. v The projecting portion 50 of the work WOIIldf bG liable to hit the shaft or journal or adjacent portion of the cutter when the latter was cutting at 47 It has heretofore been considered necessary to emplpy a large cutter because certain of the cutter blades have been gou 'ng cutters, and intermediate blades .have een finishing cutters, but by having the gouging or ,ation of the cutter.

routing cutters at the front as at 42in my cutter, I am enabled to secure all the requisites of properand ra id removal of the wood, and leave all the ishin cutters together to constitute simply the eration separate from the rough-work oper- Furthermore, by thus reducing the size and setting the axis obliquely as shown and explained, the cutter (and also the pattern wheel) is enabled to enter considerably within the extreme outer circle of rotation of the work (and pattern or model) for forming any desired rentrant curvatures such as shown at 45-49, without interfering in anyway with the work. As the angle of the supportin spindle 18 is ob-j lique, 1t is carried away rom the projectmg portions of the work so that the latter the internal curves 45-49. mentioned.

claim as new,

cannot hit it or any of the adjacent parts as the work rotates while the cutter is cuttin As already intimated, my invention is apand also is not confined to the precise constructional details herein shown, as many variations in shape and arrangement may be resorted to" without departing from the spirit and scope of the invention as defined 1n the appended claims.

Having described my invention, what I and desire to secure by Letters Patent is:

the work but materially increasing,

ishing op- 1. .In a last-turning lathe, the combina tion with work-holding meansand model:

holding means, of a cutter spindle set; ob-

liquely to the longitudinal axls of the work at an angle away from the work in a direction away from that of the feed when cutting; having its end which is nearer and whic points toward the work and which extends 7,

toward the workin the direction of the rela tive cutting movement freely PI'OJEOtlIlg be-' yond its bearings, a cutter on said free end. of said spindle having a finishing portion of relatively large diameter projecting-radially;

beyond said bearings, and a patternwheel' for engaging the model set in the same relation to the model that said cutter is set with relation' to the, work and ad ustable relatively to said cutter toward and from the work. v p

2.. In a last-turning lathe, the-combination with work-holding'means and model-holding means, of a cutter spindle set obliquely to the longitudinal axis of the work, having its end which is nearer the work and which extends in the directibn of the relative cutting movement. freely proj eating beyond ts bearings, a cutter on said free end of said spindle, said cutter having atits forward end a rough-work turning portion of rela tively small diameter, and between said front end and its bearings a finishing por- 1 tion' of relatively large diameter.

3. In a last-turning lathe, thecombina- 'tion with work-holding means and modelholding means, of a small cutter capable of cutting in accordance with the sharp curves and reentrant angles of an extreme last model, "said small cutter having ts axial support set with'relation to the work at such an oblique angle extending awayfrom the work as to be entirely outside of the range of movement of the projecting finished ortions of the work, and having a. finls mg portion of relatively large diameter extendmgfre'ely' beyond said bearings anda cen tral forwardly piojectmg-rough-work turning portion of relatively small diameter, and

' a small pattern member for following .the

model adjustable toward and from the work,

having the same engaging size and shape as the cutter and set at the same angle with relation to. the model as said cutter is, set

with relation to the work. a

In testimony'whereof, I have signed my name to this specification, in the presence of MICHAEL H. LYONS. f Witnesses:

. FRED L. SPRAGUE,

\ FRED BRmowoon.

two subscribing witnesses.-

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