US293292A - williams - Google Patents

Description

(No Model.) l i 3`Shets`Sl1eet 1. E. o. WILLIAMS.

' DRILLMAKING MAGHINE. No. 2193.292. l1 a'1;eme"l Peb; 1.2.1884.

u. PETERS. mia-Langman. wmnnghm D. C.

(No Model.) t 3 Sheets-Slmeet .2.

` E. O. WILLIAMS.

DRILL MAKING MACHINE.

. No. 293.292. Patented Feb 12 18.84.

rj y I- VMTNEESEE ,//fl l (No Molniel.) I 3- Sheets-Sheet;I 3.

' E. O'. WILLIAMS.

Y i DIIIL'L MAKING MACHINE. No. 293,292. A Patented'reb. 12, 1884.

` NVENTDH 1 UNITED STATES 4PATENT einen.

EDWIN O. `WLLIAMS, O OF TAUNTON, MASSACHUSETTS, ASSIGNOR'TO HIMSELF AND BYRON L. DVVINELL, OF SAME PLAGE.

DRILL-MAKlNG MACHINE.

SPECIFICATION forming' part Of LettersV Patent `No. 293,292, dated February 12, 1884. VApplication filed J une il?, 1883. (No model.)

To all w/wm it may concern:

Be it known that I, EDWIN `O. WILLiiMs, a citizen of the United States, residing` at Taunton, in the county of Bristol and State of Massachusetts, have invented certain Improvements in Drill-MakingMachines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, makingpart of this specifica- O Io tion, in which- Figure l is a plan of a forging-machine con structed in accordance `with `my invention. Fig. 2 is an elevation of one side of thesame. Fig. 3 is a vertical section through the center I5 of the same.

through the same, taken in a plane Vpassing through the 'side rocking levers. Fig. 5 isa transverse vertical section through the same enlarged, taken in a plane passing; through 2o the centers of the four rocking levers which carry the dies, showing a grooved drill between the latter. Fig. 6 is au enlarged perspective view of one of the vertical rocking levers detached. Fig. 7 is an enlarged perspective viewof one of the side rocking levers detached.

My inventionrelates particularly to forgingmachines for rolling grooved or fluted drills, and has for its object to enable me to effect 3o this operation in amuch more perfect manner than has hitherto been possible. Heretofore it has been customary to produce the grooves in forged iiuted or grooved drills by passing the rod or blank a number of times between 3,5 a single pair of rolls provided with suitable dies;` but as these dies operate from two opposite sides only of the blank-t'. e., the sidesin which the grooves are formed-the metal at the bottom of the grooves is compressed or 4o drawn down to' a greater extent than the thicker portion of the metal at the upper edges of the grooves, which is stretched in such manner as to cause it to frequently crack along the outer edges of these grooves. Furthermore, the edges of the grooves are not rendered sharp, as required, but are rounded by the action of the dies, which press the metal inward at these points. Moreover7 a` portion of the metal is always forced out between the Fig. 4 is a horizontal section` dies, producing longitudinal fins, which must 5o be rolled down smooth by changing from one pair of dies to another and turning lthe rod or blank a quarter-way round at each change, and this alternaterolling of the drill first upon two oppositey sides to produce the grooves and then upon the two other opposite sides to roll down the fins often causes the metal at the center of the bottom of the grooves, where it is thinnest,to crack or split longitudinally,which spoils the drill being forged and renders it 6o valueless.

My invention has for its object to overcome these difficulties; and it consists in a forgingmachine provided with four rocking levers,

. each having a suitable die, and adapted to opcrate simultaneously upon four opposite sides `of the drill-blank or other article being forged, whereby the grooves are produced in a perfectmanner with sharp edges, as desired, and without the formation of fins upon the metal,l 7o and all liabilityV of cracking or splitting the metal in the operation, as heretofore, entirely avoided; and my invention also consists in certain details of construction, as will be hereinafter set forth and specifically claimed. 7 5

In the said drawings, A represents the bed or frame of the machine, which is supported on suitable legs, as shown.

B C D E are four levers, arranged in pairs, the journals of the two horizontal or side le- 8o vers B G having stationary 'bearings in the b'ed A, andthe journals of thetwo vertical le-` vers D E having their bearings in two levers or carriers, G H, which are pivoted at or near their centers between lugs b, projecting fromthe upper and under surfaces of the bed A. rThe vertical levers D E are provided `with convex dies c, adapted to form grooves in two opposite sides of the rod or drill blank, and the horizontal levers B G are furnished 9o with concave dies d, formed to fit around the two opposite or ungrooved sides of the rod, and, with the dies c, inclose the rod around its entire circumference, as seen in Fig. 5.

To the outer ends ofthe levers D E are pivoted connecting-rods e e, which are pivoted'to cranks g h on Vshort shafts t' k, having their bearings in brackets l, these shafts i 7c having secured -to their outer ends gears K L, which are driven by a gear, M, secured to a horizontal shaft, N, 'which runs in bearings on the bed A. To the opposite ends of this shaft N are secured two cranks, lm, whichare connected by rods u p with a cross-head, l?, which slides backward and forward within a 7suitable space or guideway, l0, formed within the bed A, and to the opposite ends of the cross-head are pivoted two connecting-rods, Q Q, the opposite ends of which are pivoted to the outer extremities of the side levers,]3 C. The gear M engages with a gear, R, on the driving-shaft S, and thus as the latter is rotated the four die -levers B C D E, through the connections described, are simultaneously rocked or vibrated on their pivots in such manner as to cause the rod or drill blank, when entered between the four dies, to be drawn inward and again forced outwardfor the purpose of rolling the grooves. As the grooves cannot be properly formed at a single operation of the rocking die-levers, the rod or drill blank must be introduced between and subjected to the action of the dies a number of times in order to gradually roll the grooves down to the desired depth; and to effect this result without the necessity of employing a series of dies arranged at varying distances apart, the vertical die-leversD E, instead of having their journals in stationary bearings, are' pivoted within the levers or carriers G H, as previously described, and the front ends of these carriers are caused to approach each other at each inward vibration of the die-levers,in order to diminish the distance between the convex grooving-dies c, in the following manner: Vithin a rectangular aperture in the bed A is placed, between the rear ends of the carriers G H, -a cam, T, which is secured to a horizontal shaft, q, having its bearings in the f bed A. This cam is provided with two projections, 12 13, one for each of the carrier-levers G H, whereby as the cam is rotated the rear ends of the levers are gradually separated from each other against the resistance of springs r r, thus diminishing the distance between the dies c, as required. .The cam T is rotated intermitt-ingly to produce a movement of the carrier-levers G H at each forward movement of the outer ends of the dielevers by means of a ratchet-wheel, t, which is secured tQ one end of the shaft q and actuated by a spring pawl or arm, u, secured tol the cross-head P, the ratchet-wheel being moved a distance equal to that between two of its short teeth at each forward movement of the cross-head. The ratchet-wheelt is provided with ten teeth and two flattened portions or spaces, c', on opposite sides, and when one of these spaces a is brought uppermost the pawl uQwill move thereover without turning the ratchet-wheel, the intermittent rotation of which is thus automatically stopped after the rod has been rolled the required number of times, until it is moved forward by means of a hand-lever, b, provided witha pawl, c', and spring d sufficiently to cause the pawl u to engage with the first tooth beyond the space a on the next forward traverse of the cross-head, the hand-lever being moved just before a new rod or blank is inserted between the dies. Instead, however, of the hand-lever b', with its pawl, a simple crank-handle or other device may be used for turning the ratchetwheel. The number of teeth between the two spaces c on each side of the ratchet-wheel t corresponds to the number of times that the rod or drill-blank is to be subjected to-the action ofthe rocking dies. Five times has been found.

to answer well; but the number of times may be varied as desired by increasing or diminishing the number of teeth on each half ofthe ratchet-wheel t. The spaces a of the wheel t are successively brought into line with the path of the pawl u immediately after the cam T has been rotated-into aposition to allowthe carrier-levers G H to beseparated at their front ends to their greatest extent by their springs r o", and by thus automatically preventing a further rotationof the-ratchet-wheel at this time the dies c are always left at their greatest distance apart after a drill has been forged, and caused to remain in such position until a new blank is inserted, when the ratchetwheel is again brought into actionby a movement of the auxiliary lever b, as before described, when the dies c will be advanced or brought nearer and nearer together until the operation of rolling the blank is completed. It will be apparent that as the driving-shaft is rotated continuously, if the rotation of the cam T was notV automatically arrested at the proper time, the blank might be inserted when the dies c were nearest together, or in a relative position other than the proper one for the commencement of the rolling operation, hence the necessity of employing an automatic device for insuring the dies being in the proper position at the commencement of the work.

Instead of having the journals of the horizontal or side levers, B C, supported in stationary bearings, as shown and described, they may have their bearings in levers or carriers of similar construction to those G H of the vertical levers, and operated in like manner to cause the dies lof the levers B G to advance-toward and recede from each other, which construction would be found desirable for rolling an article with four longitudinal grooves in its foury opposite sides.

Although the above-described machine is intended particularly for rolling iuted or ground drills, it is evident that it may be employedfor rolling other articles, if desired, it being merely necessary to employ dies of the proper form to give the article being rolled the desired shape in cross-section.

The above-described machine possesses great advantages over those heretofore constructed, having a single pair of dies working upon two sides of the rod or blank, as the four diesof IOO IIO

and perfect, as desired, desiderata hitherto unattainedin any machines for forging grooved drills with which I am acquainted.

"What I claim as my invention, and desire to secure by Letters Patent, is-

ll. In a forgingmachine, the combination of four rocking levers arranged in opposite pairs,

and provided with convex and concave dies, respectively, said dies adapted to operate simultaneously upon the four opposite sides of a drill-blank or other piece `of metal, and Vto extend entirely around the same, and means for operating said levers, the grooves in the blank being rolled as the blank is drawn in and forced out between the dies, substantially as and for the purpose set forth.

2. In a forging-machiue,the combination of a pair of rocking levers provided withY dies adapted to produce longitudinal grooves in two oppositesides of a rod or drill blank,V

with a pair of rocking levers provided with dies adapted to operate simultaneously with the grooving-dies upon the Aoutside of the rod or drill blankbetween the edges of the grooves, means for diminishing the distance between the groovingedies, and means for operating said levers, substantially in the manner and for the purpose set forth.

3. In a forging-machine, the combination, with a pair of rocking levers provided with dies, and adapted to operate upon two opposite sides of a rod or drill blank, of a pair of levers, D E, provided with dies, and pivoted to levers or carriers G H,'and means, substantially as described, for operating said carriers to cause the dies of their levers D Eto advance toward and recede from each other, substantially as and for the purpose set forth.

4. In a forging-machine, the combination, with the movable carriers G H and their rocking levers D' E, provided with dies, of the cam T, placed between the carriers GH, the springs r r, shaft q, ratchet-wheel t, and the arm or pawl u, all constructed to operate substantially in the manner and for the purpose described. d,

v5. In a forging-machine, the combination of the movable carriers G H, the rocking levers D E, pivoted thereto and provided with dies, the cam T, shaft q, pawl a, and the ratchetwheel t, secured to the cam-shaft, and provided with one or more spaces, a, whereby the intermittent rotation of the cam T is automatically arrested when the rod or blank has been rolled the required number of times, and the dies c have been separated to their greatest distance apart, all constructed to operate substantially in the manner and for the purpose set forth. y V' Witness my hand this 18th day of June, A. D. 1883.

Crais. H. FIELD, B. L. DWINELL.

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