US245756A - Machine fob twisting brill blanks - Google Patents

Description

. 4 Sheets-Sheet 1. T. W. WEBB. MACHINE FOR TWISTING. DRILL BLANKS.

Patented Aug. 16, 1881.

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V T. W. WEBB; v MACHINE FOB TWISTING DRILL BLANKS. No. 245,756. Patented Aug. 16,1881.

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T W WEBB MAGHINE FOR TWISTING DRILL BLANKS.

Patented Au 16,1881.

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T. W. WEBB. MAGHINE FOR TWISTING DRILL BLANKS.

Patented Aug. 16

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UNITED STATES PATENT O FICE- THEODORE W. WEBB, OF PITTSBURG, ASSIGNOR TO HIMSELF AND PARSHALL D. NICOLS, OF SEWIOKLEY, PENNSYLVANIA.

MACHINE FOR TWISTING DRlLL-BLANKS.

SPECIFICATION forming part of Letters Patent No. 245,756, dated August 16, 1881.

Application filedMay 4, 1881. (No model.) i

To all whom "it may concern:

Be it known that I, THEODORE W. WEBB, of Pittsburg, county of Allegheny, State of Pennsylvania, have invented or discovered a new and useful Improvement in Machines for Twisting Drill-Blanks; and I do hereby declare the following to be a full, clear, concise, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which--like letters indicating like parts- Figure 1, Sheet 1, shows a front elevation of my improved machine for twisting drill-blanks. Fig. 2, Sheet 2, shows a sectional elevation of the same, the plane of section, except through the rolls and shafts, being vertical in the line 00 at, Fig. 1. Fig. 3, Sheet 3, is a top-plan view of the machine, part of the top adjusting-gear beingremoved. Figs.4.and5are enlarged views 0 of the die-rolls, with short sections of their shafts, illustrative of the bearing and action of the rolls or dies upon the blank in the operation of twisting. Fig. 6, Sheet 4, shows sections of the dies and blank magnified to twice the size of Fig. 4, the sections through both blank and dies being transverse. Fig. 7 is a similar view of a modified form of blank and dies. Fig. 8 is a detached view, to the scale of Figs. 6 and 7, of the front guide and seg o ments of the dies of the rolls, illustrative of the twisting action of the dies, as hereinafter explained. Fig. 9 is an end viewof a finished or pointed twist-drill as made from my improved blank. Fig. 10 is a diagram illustrative of the bearing of the dies within the grooves of the blank. Fig. ll is a detached view of coupling-connection made in the adjusting mechanism of the machine, and Fig. 12 is a perspective view of my improved blank drawn to an enlarged scale.

My invention relates to the twisting of drill and similar blanks; and it consists in certain combinations of die-rollers for effecting the desired twist, guides for directing and. holding 5 the blank to be twisted, and mechanism for adjusting, supporting, and driving the rolls, as hereinafter described and claimed.

The purpose of my invention is primarily to twist drill-blanks of the special form shown enlarged in Figs. 6 and 12, Sheet 4. This blank S consists of a rounded shank, s, and a grooved portion, the two grooves s 8 being made on opposite sides through such part of the length of the blank as is to be twisted. The special features of novelty and utility or advantage in this blank arise from the peculiar form of the grooves. (See Figs. 6 and 12.) These grooves have, in general terms, a con cave form, their width at the surface being one-fourth, or nearly one-fourth, of the circum- 6o ference of the blank; but the points or lines 8 of deepest depression of the grooves are out of and on opposite sides of a medial plane dividing the blank between theedges of the grooves; or, the dividing-plane being represented by the line 1; v, Fig. 6, the line is of deepest depres sion in the upper groove is to the right of such central plane, lookingtoward the grooved point or end of the blank, and in the lower groove such line 8 is to the left of the plane.

The distance between depressions s 8 measured at right angles to the line or plane '0 'u, may be varied somewhat; out I prefer to make it about one-sixteenth inch in a half-inch drill, as represented in Figs. 4 and 5, Sheet 3, more or less, and in an inch drill about one-eighth inch, more or less.

Between the lines 8 and the nearest edge of their respective grooves the side of the groove is made concave, as at a, and from theselines s to the rem otest edge the sideis made straight, or nearly straight, as at a. In the two grooves the long sides a a, as also the short concave sides a a, are diagonally opposite. The purpose'in view in thus making thelines of deepest depression 011 either side of the center is to throw the long or cutting edges n on off from or out of the radial lines of the drill when twisted. This feature is more fully represented in Fig. 9, which represents the tapered point of a finished drill, the cutting-edges being represented by the letters a n, as before, and the other or curved following edges by a a. By reference to this figure it will be seen that the cutting-edges a n are not in radial lines, or, in other words, they terminate at their inner ends on opposite sides of the central point or axial line of the drill.

The advantages secured by setting the cut ting-edges off the center or dead-pointvin tools of this class are well understood. Such a blank may be made from a round rod of proper length by rolling or swaging dies, or by forging or other well-known methods of working and shaping steel.

WVhile I have designed my improved machine primarily for twisting the form of blank above described, this being what I consider the best form, yet I do not wish to limit my invention to this specific use, as by changes in the apparatus such as are presently described other forms of blanks may be twisted in substantially the same manner and by the same means.

My improved machine is constructed as follows: Briefly stated, I employ two die-rolls, or rolls having rolling-dies thereon, arranged to take peripheral bearings on opposite sides of the blank, the directions of bearing being inclined across the blank in opposite directions. I also employ improved means for guiding the blank and for mounting, adjusting, and driving the rolls.

In the drawings, A and A represent two die-rolls,which are keyed or otherwise removably mounted on shafts B B. These shafts are crossed horizontally at less than a right angle. The rolling-dies A A are formed, by preference, ofa body or hub, a, and a surrounding tongue or die, a. The height of these tongues is a little greater than the depth of grooves s s in the blank S, (see Fig. 4,) and the form or shape of their peripheries corresponds, by preference, to the grooves in cross section, so that it the rolls be run lengthwise of the grooves the tongues a will fill or fit into the grooves. If preferred, however, the sides of the tongues adjacent to the cutting-edges a a may be cut away slightly toward the base of the tongue, so as to prevent rubbing of the blank and enable the blank to pass easily.

Such cutting away will, especially in the respects named, afford material advantage; but it should be slight and not such as to change materially the form of the tongue from th at of the groove. These die-rolls A A are secured, as stated, at or near the crossing-points of the shafts B B, respectively, and the tongues a are thereby crossed at the same angle as the shafts, butin directions at right angles to the shafts.

The line of feed is in a horizontal direction biseeting the acute angle between the tongues. Rotary motion is given to the rolls or dies in opposite directions by means presently to be described. If the grooved part of the blank S be passed longitudinally between the dies in the line of feed, and the shank, or that end ofthe blank on the feeding side, he prevented from turning, the two dies or tongues a a will take bearings on the blank in opposite directions diagonally across the two grooves. In so doing the upper die a bears upon the right-hand side, m, of the upper groove 8,

bending the corner 8 downward, and the un der die a. bears upon the left-hand side a of the under groove 8, bending the corner 8 upward, as illustrated in Fig. 5. At the same time the dies by their rotary motion pass or feed the blank forward, and thus continue the bending operation described, thereby twisting that part of the blank which passes between the dies, as illustrated in Fig. 5. After this bending operation commences at the end of the blank the bearing of the tongues or dies is practically continuous from the sides a of the grooves, as above described, across the bottoms of the grooves to or part way up the sides a; but the directions of hearing are still inclined diagonally across the grooves in opposite directions.

In order to prevent the dies ortongnes from hearing against the edges of the grooves, I make the dies of such size that the curve of their peripheries is less than the curve of the groove in the line of hearing as the same appears after the twisting action begins. I have illustrated such curve in the line of bearing by the line y y, Fig. 10, and the curve of the periphery of the dies as related thereto in operation by the line y y. I have shown in Figs. 4 and 5 proper sizes of die-rolls for twisting a half-inch blank. From these data the skilled mechanic can readily determine the proper size of dies for twisting other sizes of blanks without distorting the forms of the grooves or abrading their edges by pressure of the dies thereon.

In order to bring the rounded sides of the dies a well up to the concave sides a of the grooves and away from the cutting edges or sides a, and also for the purpose of assisting in the twisting operation, I set or adjust the upper dieroll, A, a little to the right of the crossing-point of the shafts and the lower dieroll, A, an equal distance to the left of such crossing-point, so as to separate the ridges a of the tongues, measured horizontally at right angles to the line of feed, a distance equal, or about equal, to the distance separating the lines 8 of deepest depression in the grooves measured in similar manner.

I have found that with the form of blanks shown and above described, especially, such endwise shifting of the dies causes them to give better results. This, I think, is partly due to the fact that as the grooves pass from the tongues on the delivery side they are substantially in the plane of the tongues, and the ridges a are enabled to fit more nearly in the lowest lines of the grooves. The blank can be twisted, however, by these dies without such setting off from the crossing-point, and in grooves of other forms, or where the lines of deepestdepression are midway between the edges, such setting oft may not afiord all the advantages secured thereby in blanks of the special form shown, though it will assist in effecting the desired twist, especially in blanks with shallow grooves, or having flat or reduced faces of other forms, as in auger-blanks and similar articles. The pitch of the twistgiven to the blank will depend upon the angle of inclination between the dies, or the inclination of their bearings across the blank. I will presently describe means for adjusting this angle.

In order to direct the blank in the line of feed and to prevent it from turning while being fed in, I make use of two guides, O D. The guide 0, on the front or feeding side, consists of a standard, 0, and base G On the upper end of the standard is made or secured a tubular head,c, the bore of which corresponds in size, approximately at least, to the size of the blank S. A rectangular box or trough, 0, leads back from the opening 0 in its axial line. This box is open on its upper side and ends, and it is made ofsuitable width to admit the tongs T, (see Fig. 3.) with which the shank of the blank is held. The bearings afforded by the sides and bottom of the box not only align the blank properly as it is passed to the rolls, but also prevent or assist in preventing rotation of the shank end of the blank during the operation of twisting. With the aid of such a guide the workinan can feed with certainty and accuracy,and can very easily prevent any tendency toward rotation or toward bending the blank out of line.

The lower end of standard 0 is made round, and it is held by a binding-screw, 0 within a tubular socket, 0 which latter is formed on the inner end of base-plate 0 By means of such connection the standard can be raised or lowered, and also rotated axially, so as to change the height and direction of the feed through the tube and box 0 c with relation to the line of feed through the rolls. The baseplate (J extends back or outward from the position of the standard, and it is adjnstably secured to the bed-plate W of the main or supporting frame by bolts 0 passing through the bed-plate and through slot 0 in plate G By means of this attachment the guide can be moved toward and from the rolls, and also moved sidewise from the bolt 0 as a center, thereby adjusting,in connection with the other means described, the guide-opening c c vertically, horizontally, and axially with relation to the line of feed. The purpose of these adjustments will more fully appear in connection with adjustments provided for the rolls, as presently described.

The rear guide, D, is constructed substantially like guide 0, except that the box 0 is omitted. It consists of standard D, having tubular guide-opening d, base-plate D", with socket (i binding-screws d and d, and slot d These guides, being capable of the adjustments described, can be set close to the dies in any line of feed which ordinary conditions of use may require.

The die-shaftsB B are mounted as follows: The upper shaft, B, is journaled in blocks or brasses b b, which are adjustably secured in two housings, E E, which latter are, by preference, permanently secured to bed-plate W by bolts or otherwise. Endwise movement of the shaft is prevented by means of collars 1), some or all of which are made removable by screw attachments, as at N. The brasses I) are vertically adjustable within the openings E of the housings by means of screw stems or rods E working through nuts or screw-blocks in the housing-caps. In order to raise and lower both ends of the shaft simultaneously, and thereby retain the horizontal position of the shaft, I make useof an adjusting-shaft, E, which is journaled in T-couplings T on the upper ends of rods E and by means of the bevel-gearing e c rotation of shaft E through hand-wheel E will turn or rotate the screwrods E The wheels 0 c on shaft E are keyed in position so that, when desired, either one may be moved out of engagement or out of gear and one rod, E be operated alone, so as to changetheinclina-tion or direction of shaft B.

In order to retain a right-angled relation between shaft'E and screw-rods E when one t rod is raised or lowered alone, I extend the threaded end of rods E upward through the hubs of the wheels, and thereby secure additional length for making the desired adjustment. The lower branch of couplings 1 rests upon the hub e of wheels 6, (see Fig. 11,) and an extended pin, t, enters and occupies a round hole in the end of rods E One or more nuts, 6 hold wheels 6 up in gear with wheels 6, and a key, 6 on the hub slides in an elongated groove, 6 and prevents wheels 6 from turning on their respective shafts or rods E When itis desired to move eitherrod E alone the nuts 0 on that rod are run down and the wheel 0 dropped out of gear. The rod is then screwed up or down, as required, after which the wheel 0 is again raised into gear and nuts 6 screwed up to support it. Both rods E may then be operated in unison by shaft E which is at right angles to both, though the distance from 1& to brasses b b will be unequal in some cases. Also, as a provision for changing the inclination of the shaft, the flanges c on the side edges of brasses I) b, which bear against the faces of the housings, and thereby hold the brasses as against end pressure, are, by preference, inclined to the face of the housing, as shown in Fig. 1, so that the brasses may tip without binding the shaft.

If desired, the rods E may have a swiveled connection with brasses I) b, so as to support the same; or coiled springs may be placed within the openings E, below the brasses, to support the weight of the shaft and roll, and to raise them as the rods E are turned up.

The under shaft, B, is journaled by brasses fin two housings, F, which latter are secured to or made part ot'a bottom connecting-plate, F. This plate, with its housings and shaft, is pivoted on the bed-plate W by a central pin, F which enters and turns in a suitable hole in the bed-plate. This pivot or center of motion is directly under the crossing of the shafts,

in the foot of the housings.

and by turning housings F on this center the angle of crossing between dies or shafts can be increased or diminished at pleasure.

In order to secure the housings F in the desired adjustment. bolts 9 are passed through the connecting-plate and through slots 9 in the bed-plate W. These slots are curved, with pin F as a center.

Removable collars f are employed to prevent endwise motion of the shaft, and the shaft is raised and lowered as required by screw- .rods F working through tapped holes or blocks These rods bear against or are coupled to the brassesf, and, passing through curved slots or other suitable openings in the bed-plate W, they gear with an elongated gearwheel, G, by .pinions G. The wheel G is carried on the upper end of a short shaft, G which is journaled or mounted in the end of post G and is rotated by handwheel G The length of wheel G is sufficient to allow the desired ran ge'ot' upward and downward movement of the wheels G for raising and lowering the bottom roll, as may be required in use.

When it is desired to move either end of the shaft independently of the other the proper wheel G may be ungeared by unkeying it and sliding it up or down on the shaft, and when the rods or shafts F are turned to the desired position such wheel may again be put in gear and secured as before. In order to secure the requisite length of screw-rods F for the lastmentioned adjustment, they may be extended below the usual position of wheels G when set for horizontal adjustment of the shaft, as represented in Fig.

It will be observed that the flanges f which hold brassesfin place within the housings, are inclined to the housing -faces, like the flanges 0 By using die-rolls of proper size, as above described, all sizes of drill-blanks may be twisted with the dies simply crossed, as herein shown and described; but the range ofsizes of blanks which can be twisted with good results on one set or size of such rolls is comparatively small. This range can be considerably extended,however, and also other material advantages can be secured by separating the shafts more at one end than at the other, measured vertically, and thus both cross the dies or rolls and also tip one orboth of them to an inclined position with relation to a horizontal plane, and it is principally for the purpose of thus tipping the rolls, and thereby avoiding the necessity of frequent changes, also to prevent to a greater extent the rolls from bearing against the cuttingedge of the blank, that I have provided means for raising and loweringindependently the ends of the shafts, as above described.

I do not, however, claim herein as my separate invention this feature of tipping or inclining the axes ofthe rolls to a horizontal plane in addition to crossing their peripheries, as a machine having rolls or dies so arranged on inclined axes is made the subject-matter of a joint application for patent by myself and Parshall D. Nicols; but I do claim as a part of my invention a machine having, as above described, such capacity of adj ustment that the rolling-dies which twist the blank can be set in either position at pleasure-that is, with the dies crossed, but not otherwise inclined, or with one or both the dies inclined to both vertical and horizontal planes through the line of feed.

The rolls A A are rotated in opposite directions, as in ordinary reducing-rolls, by means of bevel-gear wheels It It, the cogs r of which are inclined both downward with the beveled face of the wheel and also across such face to a point or points outside of their respective shafts. This double inclination is such that when the cogs are brought into mesh or in line between the centers of the twowheels R R such meshing cogs point toward or are in a line passing through the center of the line of feed between the hearing or biting points of the dies. This inclination being determined, as stated, for one tooth or cog, the rest are laid off with a corresponding inclination. The two wheels are duplicates, or are castfrom the same pattern. They are keyed on the extended ends of their respective shafts, and by shifting them along the shafts they can be made to gear and cause the rolls to rotate together, under any of the adjustments above described, within the limits which use may call for.

If desired, other forms of gearing may be employed, though I prefer that shown and described.

Power may be applied directly to either shaft in any convenient way; but to prevent slipping an d irregular motion I prefer to gear from vone shaft, as B, by a comparatively large wheel,I, to a drivin g-shaft,I, carried on bracket 1 and driven at comparatively high speed by belt-pulley 1 I have found in practice that it is more convenient to drive from the lower shaft, B, and thereby leave the upper shaft, B, free to be raised and lowered, which is frequently desirable. I have also found by practical use that it is more convenient to make the housings E stationary and to vary the angle between shafts by turning housings F on pivot F This manner ofvarying the angle shifts the line of feed, provision for which is inadein the adjustments described for the guides C D, as above described; also, such shifting or turning of shaft B changes the relationship of wheel I to pinion '2 When, therefore, it is desired to vary the angle of crossing of the rolls, I release the bolts 01, by which bracket I is bound to the post W of the frame, and thus permit the pinion to fallout of gear with wheel I.

By the use of liners between the bearingsurfaces of the bracket and post the cogs of pinion 1 may be brought into line with those on wheel 1, and this being done, the bracket and pinion are moved upward into gear and secured as before.

The difference in the pitch of twist required in drills is small, and the provisions made, as herein described, for effecting the desired adjustments or changes to secure the required pitch are adequate for practical purposes.

I prefer to drive shaft 1 by belt and pulley, as before stated, although other modes of drivin g may be employed. By shifting the driving-belt to driving-pulleys running in different directions the motion of the rolls may be reversed as desired. Means for doing this are in common use, and I do not deem it necessary to describe the-same.

It will be observed that the inner faces of housings E are separated sufficiently to permit housings F to be moved between, or partly between,them. By this means the angle of crossing between dies may be reduced, or the shafts may be brought nearly or quite into parallel relation. A small angle of inclination or crossing secured in this way would give a comparatively longtwist or pitch, and a greater angle would give a shorter twist. The twisting action of such crossed die-rolls is still further illustrated in Fig. 8. In this figure the line 2 z isdrawn horizontally through the center of the guide-tube c, and represen ts the plane in which the blank is fed to the rolls; also,the line 2 z is drawn to represent the position or relation to the plane of feed of the space seen through the tube 0 between the dies 0,. The blank, in order to escape reduction by the dies as it passes between them, must turn axially or shift its position from line 2 z to line 2 a, and if the shank end, or the end on the feedin g side, be prevented from turning, a torsion or twist will be given to that part of the blank which passes between the rolls. The rotary motions of the dies not only twist the blank, as described, but also give it feed motionthat is, pass the blank longitudinally forward with the same motion and operation by which the twisting is efiected. It will be observed that in this operation the only strain imposed upon the blank is' that which results from preventing the shank end from turning, and that it is entirely free from longitudinal strain or compression, such as results from forcing a blank endwise through a stationary die, or from forcing a moving die or twisting device lengthwise along the blank.

So far as I am aware, twistingmachines heretofore in use have involved in some form both torsional and endwise strain. Such endwise strainis apt to bend, buckle, or even upset, a heated blank. By my improved method of applying twisting-power I not only avoid such endwise strain and all the objections incident thereto, butI also reduce to that extent the amount of power required to do the twist ing, as all the power heretofore expended in endwise strain is waste power. It does not effect the twisting, and its principal effect is to strain and injure the blank operated on. I consider this feature of my invention a very important improvement in the art of twisting drill and similar blanks.

In operation the grooved end of the blank is properly heated, when the workman grasps the shank with a pair of tongs, T, as represen ted in Fig. 3. He then presents the grooved end to the rolls, passing it through guide-tube 0. Proper alignmentis secured by resting the blank on the bottom of box 0, with the tongs entering between the sides of the box. The operation of feeding and twisting has been described above. As the dies reach the base end of grooves 8 their motion is reversed and the shank of the blank is released, allowing the blank to run back and out of the die-rolls with a screw motion. If the extreme end of the blank should be slightly distorted by the first bite of the dies in feeding in, such distortion will be removed to a large extent as the blank is discharged. This, however, is not a material consideration, and, if desired, the upper roll may be raised in removing the blank, since other defects are often found in the extreme end of such blanks, which are usually removed by cutting off or trimming the end after twisting.

I have described my machine as adapted to twist a special form of blank; but by suitable changes in the form of the peripheries of the dies blanks having grooves of other forms may be twisted as well as those above described.

Ihave illustrated in Fig. 7, Sheet 4, one other form of blank, in which S represents a section of the blank having concave grooves S made therein. The sides of these grooves are substantially alike, and their lines of deepest depression are in the vertical plane dividing the blank equally. At A", I have shown outlines of dies or tongues having rounded peripheries conforming to the grooves S and adapted, when arranged and operated as above described, to twist the blank S in substantially the same manner as blank S is twisted.

By using tongues of rounded form, similar to those shown at A various forms of blanks may be twisted,both grooved and fiat, or otherwise reduced to other than a round form along the part to be twisted, care being taken, as above indicated, to use rolling-dies of proper size and thickness, and especially in blanks having little or no concavity, to separate or set off the dies on either side of the axial line of feed, so that the rolls or dies may tip or twist the blank from itsplane or position of feed, substantially as illustrated in the enlarged view, Fig.8.

For convenience in constructing and operatin g the machine I prefer to arrange the rolls one over the other, as herein shown and described; but this is not an essential feature, and, if desired, they maybe arranged in other positions relatively; and in speaking of horizontal and vertical planes I have made use of those terms with relation to the arrangement of parts shown, and I do not wish to be understood as limiting my invention thereby, but have used them for convenience of description.

With a machine constructed as herein shown and described all the various sizes of drills and similar tools can be twisted. The expense of such a machine, with its necessary outfit of dies, 850., is comparatively small. It is operated with small expenditure of power, and as this power is applied through the rolls directly tothe points at which bending takes place, consequently the strain imposed upon the blank is reduced practically to a minimum 5 also, the bend or twist imparted by the dies is done under favorable conditions for securing uniformity and perfectness of product.

I make no claim herein to the special form of drill blank which I have shown and described; but in so far as the same may embody in its form and construction patentable invention it will constitute in part the subject-matter of a separate application,

I claim herein as my invention 1. In a machine for twisting drill and similar blanks having two opposite reduced or grooved faces, two rollingdies having rounded or convex tongues surrounding the same, and arranged to take peripheral bearing on or within the reduced faces of the blank 011 opposite sides and inclined across such faces in opposite directions, in combination with means for preventing the blank from turning on the feed side, while it is left free to turn on the delivery side, of the dies, substantially as set forth.

2. As a means for twisting drill-blanks and similar articles, the combination of two rollin g-dies arranged to take peripheral bearings on opposite sides of and inclined across the blank in opposite directions, such dies having a line of feed bisecting their angle of inclination,:and having rounded peripheries, with the ridge or line of greatest diameter of the dies one on one side and the other on the other side of the axial line of feed, substantially as set forth.

3. In a machine for twisting grooved drill and similar blanks, two rolling-dies having peripheries adapted in form to take bearings within and diagonally across the grooves of the blank in opposite directions, in combination with mechanism for giving the dies rotary 7 motion in opposite directions, and guides on either side of the rolls in the line of feed, substantially as set forth.

4. In a machine for twisting grooved drill and similar blanks, the combination of two rotary die-rolls having peripheries corresponding in form in cross-section to the form of the relation to the line of feed, substantially as and for the purposes set forth.

6. The crossed dies A A, having peripheries adapted in form to take bearings within and across the grooves of a drill-blank, in combination with frontguide, 0, rear guide, D, and means for adjusting both such guides vertically, horizontally, and'axially with relation to the line of feed between the dies and toward and from the dies, substantially as set forth.

7. The crossed dies A A, having peripheries adapted in form to take bearings within and across the grooves of a drill-blank, in combi nation with guide D, having standard D, with tubular guide-openin g 01 therein, slotted base plate D having socket d on its inner end, adapted to receive the end of standard D and permit adjustment of the same therein, and means for binding the standard within its socket and for securing the base-plate to the bed of the machine, substantially as and for the purposes set forth.

8. The crossed rolls AA, having peripheries adapted to enter and bear crosswise within the grooves of a drill or similar blank, in combination with shaft 13 and housings E, shaft B and movable housings I centrally-pivoted connecting plate F, the distance between housings F being less than the distance between the inner faces of housings E, and means for binding housings F in the desired position with relation to housings E, substantially as and for the purposes set forth.

9. The crossed dies A A, adapted in form and arrangement for twisting blanks as described, in combination with shafts B B, for carrying the dies, means for supporting and adjusting the shafts in the desired positions and relation as described, bevel-gear wheels R B, one on each shaft, and adjustable in position along the length of their respective shafts, the cogs on such wheels being inclined, when in mesh, toward the central point of crossing between the dies, and power mechanism for communicating rotary motion to one of the shafts, substantially as and for the purposes set forth.

10. In a machine for twisting grooved drillblanks, two crossed rollin g-dies adapted in form to take peripheral hearing within and inclined across the grooves of the blank in opposite directions, in combination with axes and bearings for the dies, such bearings being independently movable in their supports from positions corresponding to a horizontal adjust ment of the axes to positions which make one or both such axes inclined horizontally, and suitable devices for moving either or both the axes from such horizontal to inclined positions and reverse, substantially as and for the purposes set forth.

l'1. The combination of crossed rolling-dies A A, shafts B B, with housings and bearings for supporting the shafts and dies, such bearings having a range of adjustment in their respective housings adapted to give the shafts either horizontal or horizontally-inclined posi- In testimony whereof I have hereunto set my 10 tions, and adjusting-screws arranged to move hand. the bearings independently to such positions of the shafts, substantially as set forth. THEODORE W. WEBB. 5 12. The combination of rolling-dies A A,

shafts B B, housings E E, centrally-pivoted Witnesses: housingsF F,brasses or journal-boxes!) f, hav- B. H. WHITTLESEY, ing inclined flanges e f and adjusting sorew- GEORGE H. CHRISTY. rods E F, substantially as set forth.

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