US940548A - Machine for grinding. - Google Patents

Description

0.1i. NRToNQ-J. c. SPBNCE & H, N. GUDWORTH.

MACHINE Fon GBINDING.

APPLIOATIOI FILED DEO. 2B, 190B.

Patented Nov. 1`6, 1909 C. H. NRTON, J. C. SPENCE &'H. N. GUDWORTH.

MACHINE FOR GRINDING. APPLICATION FILED DB0. 2s, 190e,

Patented N0v.`16,19o9.

C. H. NORTON, J. C. SPENCE Ly H. N. CUDWORTH.

- MACHINE FUR GRINDING.

APPLICATION FILED DEO. 2B, 1908. 940,548. Patented Nov. 16. 1909.

s SHEETS-SHEET s'.

9v Worf/gaf UNLTE STATES PATENT OFFICE.

CHARLES H. NORTON, JOHN C. SPENOE, AND HIRAM N. CUDWORlflH, OF WORCESTER,

' MASSACHUSETTS, ASSIGNORS TO NORTON GRINDING COMPANY, OF WORCESTER,

MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

MACHINE FOR GRINDING.

.i citizens of the United States, all residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Machine for Grinding, of which the following is a speciiication.

This invention relates to a machine and method for grinding or trning cylindrical `and conical surfaces like th' Shanks of tools.

Tools of certain classes, especially twist drills, are so constructed that the shanks of each size are substantiaily uniform in length, but the distance between the shank and the cutting edge may vary. i

The principal objects of this inwentiori are to providei a constructionA whereby a gage can be brought .up on the work holding table or carriage into such position thata shoulder or the shank end of the drill or other article can be held against the gage and the opposite end or cutting edge centeredby the head stock center, which will take a natural position to hold the end of the tool or the like in'proper posit-ion with respect to the truing device or grinding wheel, sothat. the grinding wheel will operate at the required distance from the gage, as for example to grind the necessary length of shank on the tool, and after the gage is set will produce surfaces, tool Shanks, or the like of the same length and position'until t-he gage is reset; also to provide a gage, a support, and operating mechanism therefor particularly adapted for this purpose and adapted to gage the shank from the end thereof, independent of the variable pricklpunch or counter-sink in the end; to provide a -i'orm of head-stock conter capable of yielding to ,accomplish the above described functions; to provide an improved i'orm of work-holding device for the head-stock; and in general to provide a simple, convenient and practicable construction which can be applied to a well-known type of grinding machine for the purpose of accurately and uniformly truing up cylindrical and conical surfaces especially the shanks of drills and similar tools, and also to provide a new method of grinding tool Shanks.

Further objects and advantages of the invention will appear hereinafter.

Specification of Letters Patent.

Patented Nov. 16, 1909.

Application filed December 28, 190.8. Serial Nav/469,547.

Reference is to be had to the accompanying drawings inwhich- Figure l is a plan of a` grinding machine with a practicable embodiment ot this invention applied thereto. Fig. 2 is a side elevation of the head-stock and certain other elements of the same on an enlarged scale showing a part of the head-stock in section;

Figs. 3 and 4 are diagrams in plan showing how the drill is positioned, centered and clamped ready for the grinding operation; Fig. 5 is a plan of the work locating device removed from the head-stock; Fig. 6 is a plan of a bracket at the end of the headstock; Fig. 7 is a central sectional view. 'of t-he same; Fig. 8 is a plan of the gage'and its support; and Fig. 9 is a sectional view of the same on the line 9 9 of Fig. 2.

-The invention is shown as applied to a form of grinding machine involving a bed 10, a grinding wheel stand 1.1, a grinding wheel 12 thereon, and an adjusting device 13 Jfor the grinding wheel. On the bed is arranged a reciprocating table 15, the reciprocation ofwhich is controlled in any desired wayas for example, by means of dogs 16 fixed on the table, movable therewith, and

adapted to operate a reversing leverl?,

the details of which are not vshown herein as any desired arrangement otconnections can be used. The table is supplied in the usual way with a foot-stock 18 having a center 19 and also provided` With a headstock 9.() shown as being operated by a conepulley 2l by means which will not be described as any ordinary means can be used. The cone pulley rotates a gear 25 on which is a'face plate 2G carrying a fixture 27. On this fixture are mounted a plurality of adjustable driving jaws 2S which can be moved up to engage thework and clamp it by nuts 29 or in any other desired Way. The headstock is provided with a central longitudinal passage 30 therethrough having a tapered end in which is located a taper 31 having an enlarged hollow head 32 thereon. In this head is located a 4head center 33. This is provided with a key 34 movablepin its keyway so that the head can move longitudinally, and a spring 35 is provided for normally forcing it up from the head-stock. Secured to the center is a rod 3G which extends through the head-stock and projects from the end thereof. This rodpasses into a clamp 37. mounted on a bracket 8S on the end of the carriage. This clamp is designed to be operated by a handle 3l) which controls a screw 40 so as to clamp the end of the rod for a purpose which will be explained hercinat'ter. Located also on the table is a longi-v tudinally adjustable' bracket or support Ll1 having a screw or the like l2 for clamping it on the table vin adjusted positions. This support carries a gage 48 shown as pivoted thereon and projecting therefrom. This gage is provided with a spring JA for holding it in a certain position as shown in full lines in Fig. 9, in which the end'of the gage projects in front ot' the toot-stock Center 19 and in the path thereof when the foot.- stock center is moved along the carriage or table. It Will be seen that by pressing the outer end of the gage upwardly the gage can be Withdrawn from its position in liront of the foot-stock center. It will be und-erstood that this gage reciprocates with the table or carriage and with the head-stock and tail stock.

r'he operation of the machine is tollows :wThe dogs 16 being,` properly arranged 'with respect to the carriage to give the proper amount of reciprocation thereto, a drill or tool to be operated upon is set in the position indicated in Fig. l between the head-stock center and the gage, which is adjusted bveore or after the first tooll is put in position so as to bringl the end ot its shank into proper relation with the grindiing wheel when the carriage reciprocates.

This adjustment maybe made by 'trial or otherwise, and after the first drill is properly adjusted and ground, the gage support having been secured in its adjusted position, all tools to be subsequently trued up will be uniform with the iirst one. When the gage has been set as shown in Fig. 3, the headstock center 'which has yielded-to permit the tool to be applied is lixed in position by means ot' the clamp 37, so that the longitudinal position of the tool on the carriage is fixed. The gage is then thrown back by raising its outer endv to the dotted line position in Fig. 2, and the 'foobstock center brought up to engage the end of the tool as shown in Fig. 4e. lt will be observed that the gage is then held out of position by the .'ioot-stoek center itself against the torce et' the spring l-l. rlhe parts are thcn in position in which the tool can be clamped by moans of the jaws 28, and the machine started into, operation. The travel having previously been adjusted, ity will be obvious that the rotation nl the grinding; wheel ani .the combined travel and rotation nl tile work will result in truiugi up the sbanh el:

the tool, and that evi-ry subsequent lool :ipA

seas/ie actly the saine length of shank. The taper on the shank is secured of course in the usual way by settingr over the ioot` stock center.

lllhile ive have illustrated and described a preferred embodiment of the invention as applied to a particular. type of grinding` machine, 'we are aware that it can be applied in many other Ways and that many modications may be made therein by any imrson. skilled in the art 'Without departinf? from the scope ot the invention as expresse( in the claims. Therefore We do not wish to be limited to all the details of construction shown, orto the particular type of grinding machine shown, but

What We do claim is l. in a device for grinding cylindrical and conical surfaces, the combination of a longitudinally movable head center, a foot steelt center, and a gage movable transversely with respect to the .toot stock; center and located adjacent thereto.l

ln a machine for grinding cylindrical and conical surfaces, the combination of a longitudinally movable head center, a longitudinally movable :toot stock center, said centers being adapted' to receive the opposite ends of the Work, a support and a gage ad instable longitudinally with respect to the centers and movable transversely in front of the foot stoel. center.

ln a machine tor grinding; cylindrical and conical surfaces, the combination oi a longitudinally movable head center for the theoppositc ends of the Work, a support, a-

movable transversely in front of the foot stock center, and yielding meai'is for holding said gage in the path of the foot stock center.

'in a machine 'for grinding tool Shanks, the combination of a grinding Wheel, a carriage reciprocable in front of the grinding wheel, a head center mounted on said carriage, a toot stock center on the carriage, and a gage movable With the carriage and adapted to receive the end of the work.

e. ln a machine for grinding;4 cylindrical and conical surfaces, the combination of a head stock, a center longitudinally reciprocahle thereon, means extending from the head steelt 'for fixing' the center, a ieot stock center, and a. gage adapted to be moved in iront oi the toot Stoch center.

llO

7. In amaehine of the character described, the combination of u movable head stock, n hend center longitudinally movable thereon, yieldingmeans fo11 forcing said head center ont vnrdly, :i grinning Wheel, and n` movable gage adapted to be fixed to move to a definiic position with respect to the grinding wheel ns the head stock moves and hold the end of the Work.

8. In :i grinding machine, the combination of :L reciprocating carriage, a grinding wheel adapted to be held in fixed position, and gage on the carriage adapted to be fixed thereon to move i'o u certain position with respect to the grinding wheel, said cz1rringe having means for supporting one end oi the work, said gage being adapted to support the other end.

ln testimony whereof We have hereunto set our hands, in the presence of two Subscribing witnesses.

CHARLES H. NORTON. JOHN C. SPENCE. HIRAM N. CUDVVORTH.

Witnesses ALBERT E. FAY, C. Folumsr VEssoN.

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