US350141A - Machine for facing counterbores - Google Patents

Description

(No Model.) 4 Sheets-Sheet 1. A. LATHAM. MACHINE FOR FACING GOUNTERBORES No. 350,141. Patented'Oot. 5, 1886.

Figl- (No Model.) 4 Sheets-Sheet 2.

. A LATHAM MACHINE FOR FACING GOUNTERBORES.

Patented 001;. 5, 1886.

(No Model.) 4 Sheets-Sheet 3. A. LATHAM.

MACHINE FOR FAGING GOUNTERBORBS. No. 350,141. Patented Oct. 5, 1886.

, N. PETERS. Pholo-hlhngrnpher. wnmn mn. n cy 4 Sheets-Sheet 4.

(No Model.)

A, LATHAM. MACHINE FOR FACING COUNTERBORES. No. 350,141.

Patented Oct. 5, 1886.

WZZMMJ/ my /6m All/Illrlll/li '0 UNITED STATES Fries.

PATENT MACHINE FOR FACING COUNTERBORES.

SPECIFICATION forming part of Letters Patent No. 350,141, dated October 5, 1886.

Application filed June 21, 1886.

T aZZ whom, it may concern.-

Be it known that I, ALBERT Lrrnur, of W'altham, in thecount v ol' )[iddlesex and State of Massachusetts, have invented a new and useful. Improvement in Machines for Facing ()mmterbores, which will, in connection with the accompanying drawings, be hereinafter fully described, and specifically defined in the appended claims.

Figure 1 is a front elevation of a machine embodying my invention. Fig. 2 is a top plan view or" the machine shown in Fig. 1. Fig. 3 is an end elevation,viewed as from the right in Figs. 1 and 2. Fig. t is a detached view showing the relative positions of the counterbore, the groove-forming milling-cutter, and the lacing-cutter. Fig. 5 is a detached view taken as at the left of Fig. 4, and with the facing-cutter omitted. Fig. 0 is a detached view of theindex devices, taken as viewed from therightin Figs. 1 and 2. Fig. 7 is a detached view showing devices by which the facingtool is adjusteth Fig. 8 is a detached vertical section taken on line Z, Fig. 1, and viewed as from the right in that figure. Fig. 9 isa longitudinal vertical central section taken on lineX, Figs. 2 and 3, the lower portion of the machine being omitted. Fig. 10 is an enlarged sectional elevation of the blank adjusting chuck. Fig. I1 is an elevation taken at the left hand of Fig. 10. Fig. 12 is a detached section taken on line \V, Fig. 9. Fig. 13 is a detached section on line V, Fig. 2, looking to the left therein. Figs. 1 L and 15 are projections showing the lines of cut-in facing the counterlmres. Fig. 16 is an elevation like Fig. 11, but showing a chuck with four instead of two jaws.

My invention relates to machines adapted to cut the spiral end face or clearance upon the respective lips of counterbores; and it consists in features of novelty hereinafter fully described, and winted out in the claims.

Referring,'again, to the drawings, A represents the bed of the machine, which will. be of such size, form, and proportion as to best adapt it to the various other parts ofthe machine.

13 represents the headstock, in which is supported the arbor or live hollow spindle G, constructed and arranged in manner as follows, to wit: At the rear or outer portion of Serial No. 205,770. (No model.)

theheadstock a sleeve, (1, is closely fitted to slide lineallv, and is actuated by means ofpinion 1?, which engages the rack-like teeth cutin the sleeve, as shown, said pinion being arranged in a slot, 0, in the stock, and being mounted on an arbor or stud, 1', on which lat ter is secured leverj, by which the pinion is actuated in the manner to be described. A portion orspeed, D, of the pulley is formed with a sleeve, 7;,which is fitted to revolve in the central portion of stock B, and a lesser speed, E, of the pulley is bolted to I), as shown, and formed with a sleeve, c, which is fitted in the front portion of stock B, as

shown. \Vit-hin said sleeves b c is the sleeve F, formed with wings g, which interlock in slotfin hub G- of speed D, and allow a free sliding movement ofthe sleeveF. Said sleeve F and hol low arbor O are interloelmd by spline It, to insure the coincident rotation of the arbor when the sleeve is rotated by means of the pulley. The utility of this construction and arrangement of the arbor, as also that of certain other devices carried by thearbor, will be hereinafter described. A taitstock, I, is ad .justably mounted on bed A, as shown, and

in the stock is mounted the sliding or dead spindle J, which carries the removable chuck K, to be described, said spindle J being locked in position by means of the eccen tric ring-binder L, (shown in side elevation in Fig. 8,) and which is rotated by its handle to lock or release the spindle.

Instead of lineally adjusting spindle J by means of ascrew, in the usual manner, it slides freely in its bearing when not locked by ring L, and it is adjusted in proper lineal position by means of its swinging hook a, which may be engaged with stud k, secured in stock I, a nut, at, being threaded and adjustable on said stud, as shown; and by moving spindleJ so that hook it bears against the end face of nut m the spindle may thus be placed in its desireddineal position, and then be locked by ring L; and when the ring is rotated to release the spindle hook it may then be instantly swung clear of stud 7r, when spindle J may be moved. as desired.

The counterbore-facing tool is shown at p,

Figs. 1, 2, and is mounted and held in its stock or holder g, which is pivotally mounted in the cared plate 5, which is mounted upon plate t, to be revolved for adjustment of cutter p in a horizontal plane, said plate t being mounted upon a plate, a, and susceptible of .adj ustment transversely to bed A, and having a gaging or stop screw, 5. Plate at is mounted and arranged to rotated upon plate 2;, which latter is mounted upon a bed, y, and is adjusted thereon in the direction of the length of bed A by means of screw w, said bed y being locked in position by screws z z. Said plate a is pivoted upon stud 2, seated in plate '0, this stud being formed at top and bottom with teeth, engaged, respectively, with screws 3 4, and by actuating screw 3 plate '0 and the parts thereby supported are rotated around stud 2, while by actuating screw 4 plate t and the parts thereby supported may be moved in and out or transversely to bed A; hence by these movements and the movement of plate 1) by means of screw w the cutter p may be adjusted as desired, the height of said cutter being adjusted by means of the vertical rocking movement of its holder q,- but as all the devices for holding and adjusting cutter p are described and claimed in United States Patent No. 344,283, June 22, 1886, I believe the foregoing description thereof to be sufficient. The counterbore-blank is shown at 6 as with the grooves formed and its stem portion 7 previously reduced. This blank is adjusted in the machine and held by the following-described means: A chuck, K, has a stem or body, 8, to be seated in spindleJ in the well-known manner of lathe-centers. Upon opposite sides of body 8 are pivoted the. jaws 9, provided with the gage-screws 10, while aspring, 11, tends constantly to force together the outer ends of the jaws upon blank 6, as shown in Fig. 10. A center, 12, is seated in body 8, and has an axial hole in its outer end to receive the stem 7 of blank 6, as shown.

. sleeve and bears against a collar on spindle O, 1

In the hollow live-spindle G is secured a rod, 13, against which is abutted a helical spring, 14, which tends constantly to thrust outwardly the headed rod 15, arranged to slide freely in spindle O, as shown in Fig. 9. A self -expanding chuck, 16, is also secured in said spindle O to revolve therewith, said chuck being closed by the compressive action of sleeve F, which is forced outward by actuating hand-wheel H, which is threaded on said as shown. 1

In practical use the tail-stock I is placed and secured in proper position, and nutm 011 stud 7a is properly adjusted, so thatwhen hook it on spindle J isengaged with stud It said spindle will be thereby properly positioned; then to adjust a counterbore-blank in chuck 16 the hook it is swung upward away from stud is, after the ring-binder L is slackened and spindle J is moved to the rear, and

' a counterbore-blank is inserted between jaws f chuck K, the shoulder of the blank next its stem 7 being in contact with the end face of hollow center, 12, which thus serves as a gage. After the blank is thus correctly positioned in chuck K spindle J is moved forward till hook it is engaged with stud k, and so that the hook bears against the end face of nut m,

when the spindle J is locked by ring L. When spindle J is thus advanced, the thrust action of spring 14 upon rod 15 tends to hold the shoulder of the blank against the end face of 75 center 12; and while thus held hand-wheel H is actuated to force outward sleeve F, and thus secure the blank firmly in chuck 16 without lineal displacement of the blank relativelyto its adjusting or gage center 12. When chuck 16 is thus closedupon the blank, ring L is released, hook at is raised from stud k, and spindle J is moved outward, in readiness to repeat the operation when the blank thus transferred to chuck 16 shall be finished. When theblank 6 is thus placed in chuck K and then transferred to chuck 16, its shoulder next stem 7 has always a fixed and determined position in the machine,fregardless of the length of its body or portion of greater diameter, or of the length of its stem 7; and as said shoulder is to constitute the highest point of the spiral faces of the lips, such adjustment is of the highest importance.

It is preferable, especially in the smaller sizes of counterbores, to mill the grooves therein while in place in the machine in which the facing or backing off of the lips is to be performed; and to accomplish this I form bed A with an offset upon the rear side, as shown in Fig. 2, and on this I mount the stock M, to.

be moved in guideways by means of screw 1?. in a well-known manner, and upon a dovetail way of stock M is mounted the tool-carrying head N, arranged to be vertically adjusted'by screw 0, in a manner also well known.

In head N is mounted the sleeve R, which upon its upper side has rack1ike teeth en-- gag-ed by pinion S, actuated by lever T, by means of which the sleeve may be advanced toward the axial center of the lathe to the extent permitted by stop-screw 20, carried by the sleeve, and which arrests the latterby contact with head N, as shown in Fig. 3. In

said sleeve is journaled the conical-ended arbor V, which at its rear end carries the 'conical bushing U, as shown, said arbor being driven vby abelt acting on itspulley 18, the milling-tool 19 being secured in the front end of said arbor, as shown in Figs. 2, 3. Thus when the counterbore-blank has been secured in chuck 16, as already described, the millingtool is advanced by means of lever T to the desired position over blank 6, as shown in Figs. 4, 5, the same being determined by setscrew 20, and sleeve R is then locked by setscrew 21, when by actuating screws 0 P the required depth and length of cut to form the desired'grooves in the blank is obtained, the blank being adjusted and locked in the desired positions for forming the requisite number of grooves by means of the indented index-ring 22, secured on spindle O, andits catch-arm 23, engaged and actuated by springpin 24, (shown in Figs. 1, 2, 3, and 6,) said ring being indented to correspond with the desired number of grooves in the counterbore. After the blank is thus grooved set-screw 21 is retracted and the milling-tool is moved to the rear by means of lever T, as already described, when, ifit is desired to give a finishing cut to stem 7 ot' the blanka preferable methodcutterp will be duly positioned, by the means already described, to give such cut, and when once so positioned is not again in that behalf disturbed until rendered requisite in order to resharpen. it. The cutter is moved along the stem to give such cut by means of screw to, which moves plate 1;, on which the tool 1) is mediately mounted, a stop-screw, x, secured to plate y serving to check the advance of the tool when it arrives at the shoulder of the blank.

To impart to the end faces of the several lands or lips of the counterbore the requisite spirality, termed freeing, clearance, or "backing off, after the blank has been grooved, the following devices are employed: A block, 25, secured on headstock B, has a truck, 26, pivoted therein, and a cam, XV, having as many throws as there are lips in the counterbore, is secured on spindle C, while a spring, X, is arranged on said spindle, between its collar and sleeve a, so as to tend constantly to hold said cam in contact with the truck 26. The lower end of lever j is engaged in block Y, which is arranged in a way upon bed A, and is moved lineally by means of rod Z, which is threaded in Y, and isactuated by the crank-wheel 27, secured upon its opposite end. A check or stop screw, 28, is arranged in cap 29, to arrest the movement of slide 1' and lever j when the cam \V has been moved out of contact with truck 26, as shown in Figs. 1 and 2. \Vhen spindle U is held by lever j in the position shown in Figs. 1, 2, J-that is, so that cam \V may revolve without engaging truck 26the facing-tool 1) may, if desired, be moved to take a fine finishing cut from the end faces of the lips of the counterborc before commenc ing the oblique facing thereof or said cutter may be moved close to the end faces of the lips and thus left, when by actuating sl ide'Y through rod Z the end faces of the counterbore will be gradually brought into contact with cutter p, and by the coaction of cam \V the cuts will be continued, as indicated in Fig. 14, till a spiral end face is formed upon the lips coincident with the long and flat oblique lines of cam \V, the short and steep oblique lines thereon serving, while the counterbore revolves the space bet-ween the lips, to move the counterbore to the rear, so that the cutter shall not engage the angle at the intersection of the end face and the cutting or radial line of the longitudinal groove. The stop-screw a: in such case is so adjusted that plate 0, when moved against it, will so position facing-tool 1) that when cam \V runs free against truck 26 the lips of the counterbore will have received their true spiral facing to give the clearance or freeing thereto.

Instead of operating the machine as just described, block Y may be so placed that cam V will run in full constant contact with truck 26, thus imparting the full constant recipro' eating motion to arbor C, while cutter 1) will, by the action of screw 10, be slowly advanced toward the end faces of the lips of the counterbore, so as to take at each. revolution thereof the required thickness of chip, in manner as indicated in Fig. 15, such movement of the cutter continuing till slide r is in contact with stop .1, at which point the perfected spiral or freeing will have been imparted to the lips of the counterbore.

In Fig. 16 the chuck K is shown as formed with four jaws to engage the several lips of a four-lip counterbore, such as is shownin Fig. 4-.

I claim as my invention- 1. In combination with spindle J and tailstock 1, formed with a suitable transvm-se seat therein, the eccentric ring L, having an actuating-handle, and formed to receive said spindle and to it in the seat in stock I, substantially as specified.

2. In combination with a counterbore-facing machine, a gaging-chuck formed wit-l1 center 8, the jaws 9, theretopivoted, their actuatingspring ll and gaging-screws 1.0, and a hollow center, 12, seated in center 8, to receive the stem of the connlerbore, all substantially as specified.

3. The (t)lllbillltll()ll,Wlbll agaging-chuck in the dead-spindle lot the hollow spindle 0, its rods 13 15, with the interposed spring 14,chuck 16, secured in said spindle, and sleeve F, arranged to close said chuck. and provided with an actuating hand-wheel, ll, by which to force it against said chuck, all substantially as specified.

4:. The combination, with spindle 0, provided with mcansforend adjustment, of sleeve F, having wings g, and interlocked with said spindle, pulley 1), mounted on sleeve F, and having hub G, with slots f, to receive wings y, whereby the rotation of pulley 1) imparts a corresponding motion to said spindle and sleeve, and allows a linear movement thereof, substantially as specified.

5. The combination, with sliding spindle J, of its hook it, a stud, 75, secured in stock 1, and nut in, threaded on said stud to adjust the shoulder to receive said hook, all substantially as specified.

6. The combination, with sliding spindle C, of toothed sleeve 0, arranged between a solid abutment on said spindle, on the one hand, and a rcsistingspring having a solid abutment on said spindle, on the other hand, and a pinion engaging the teeth of said sleeve and provided with means, substantially as described, whereby it may be rotated to lineally move said sleeve, substantially as specified.

7. In combination with spindle O, PIOXitlOll with a chuck for holding the counterbore., and means for rotating it, the cam XV, roll 26, toothed sleeve a, the thrust-sln'ing X, pinion (I, engaging said sleeve, and devices, substan- IlO actuate the spindle in accordance with the 10 lips of the counterbore and the requisite spirality or clearance thereof, substantially as specified.

ALBERT LA THAM. \Vitnesses:

'1. V. PORTER, EUGENE HUMPHREY.

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