US742291A - Upright tapping and boring machine. - Google Patents

Description

No. 742,291. y PATBNTEDOGT. 2v, 1903.

, L. EGO'LBURN.

UPRIGHT TAPPING AND BORING MACHINE.'

' APPLICATION FILED FEB.'19. 1902.v

Allam@ THE Nonsrs Evans co. Homin-rua. wAsHmL-.fom n. c

Y PATLNTBD OCT. 27, 190s. n' L. H. GQLBURN.' l Y UPRIGHT TAPPING ANL BORING'MACHINL.

APPLIGATI'ON FILED PEB. 19V. 1902.

' 6 SHEETS-SHEET 2.

' No MODEL.

L. H. COLBURN.

l UPRIGHT TAPPING AND BORING MACHINE.

A IIIIIIIIIIIIII D r'B.19,19z.

MEETS-SHEET@ N0, '742,291 l PATENTED OUT. 27, 1903.

L. H. GOLBURN.

UPRIGHT TAPPING AND BORING MACHINE.-

APPLIOATION FILED H1B. 19. Y1902. No MODEL.

6 SHEETS-SHEET l4.

[N VEN T OR PATEN'IEDl OCT. 27, 1903,'

No. 742,291l

yAPPLIUATION FILED FEB. 19. 1902.

6 SHEETS-,SHEET 5.

N0 MODEL.

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. PATENTED 00T. 27, 190s., L. H. ooLBURN. UPRIGHT TAPPING AND BORING MACHINE.

APPLICATION ILLDl EEE.. 19'. 1902.

6 SHEETS-SHEET (i.

N0 MODEL.

/YYVESSES its. 742,291. Patented catetere?, woe;-

UNITED STATES/PATENT OFFICE.

LESLIE II. OOLBURN, OF FRANKLIN, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO BAKER BROTHERS, OF TOLEDO, OHIO.

UPRIGHT TAPPING AN-D BORING MACHINE.

SPECIFICATION forming part of Letters Patent No. 742,291, dated October 2'?, 1903. Application filed February 19. 1902. Serial No. 94,762. (No model.)-

To all whom, it may concern: l rable parts which carry shafts and other mov- Be it known that I, LESLIE H. OOLBURN, of able parts of the machine. Franklin, in the county of Venango and State The main spindle C is mounted in the maof Pennsylvania, have invented certain new chine vertically above the table A, which sup- 5 5 5 and useful Improvements in Upright Tapping ports the work, the latter being held in proper and Boring Machines; and I do hereby deposition on the table by any suitable device, clare the following to be a full, clear, and exsuch as a chuck, vise, or clamp or bolts. This act description of the'invention, such'as will spindle carries the tap B or boring-tool, as enable others skilled in the art to which it apthe case may be, and surrounding the spin- 6o ro pertains to make' and use the same. die and held thereon against endwise move- Myinvention relates to an improvement in mentis the sleeve or quill D. Clamped to upright tapping and boring'machines, the obthis quill D' is the collar D, having-a project of the same being toprovide a mechanjection D2 on one sidev for tripping the spinism or machine bymeans of which the operadle feed when used for drilling or boring, as 65 13 tions of the parts are after starting automatic will be more fully described later on'. This in their actions, so that in tapping the tap clamp-collar D has another projection D' onwill be automatically fed into the metal units opposite side, which engages with the two til i't 'has reached the desired depth, where itV collars E and E on the intermediate upright g will stop, reverse and feed out clear of the slidingrod F. This sliding rod is pivotally 7o zo work, and finally stop altogether. connected at its lower end with the bell-crank Y A further object is to provide means for lever F', and the latter is connected to hellfeedingthe spindleindependently of the regucrank lever G by means of the extensible t lar feed for drilling or boring, so that the or adjustable rod-G. A longer rod G2 confeed will correspond to the same number of nects 'bell-crank lever G to crank H, which75 z5 threads per inch as thetap, and thus prelatter is keyed lrigidly to stud H', mounted vent the tap from stripping or spoiling the in a suitable bearing carried by the frame of threads, as would `frequently happen if the the machine, and to this same stud H is keyed tap were depended upon to do its own feeding. bell-crank lever H2, which carries av weight With these ends in view my invention con- H3 on the arm thereof, which extends hori- 85 3o sists in the parts and combinations of parts, zontally forward. as will be more fully described, and pointed Mounted in the lower end of the vertical c out in the claims. arm of the bell-crank H2 is the movable stud In the accompanying drawings, Figure l is `I4, which is enlarged at'its outer end and proa view in side elevation of myimproved mavided with an opening therein for the pas- 85 5 chine. Fig. 2 is a View in front elevation, sage of the pin or rod I',which latter is fitted parts of the mechanism being omitted. Fig. so as to slide freely therein. The lower end 3 is a view in transverse section `of a part of of pin I is enlarged for the passage of the A the machine, showing the feeding mechanism. stud I2, which latter is screwed into a bracket, y `igs aand 'are detached views of the spring as Shown in Fig. 5. i 9c 4o mechanism for imparting final impulse to the Y Embracing the rod I' between the studsl4 hand-lever. Figs. 6, 7, and 8 are detached' and I2 is the coiled spring, which is of such views of the devices connecting the hand-lelength that when the pin or rod I is vertical ver and clutch-shifting rod. Fig. 9 is a view or in line with the depending arm of the crank of the pivoted bracket for carrying a train H2 the. spring is under tension or is com- 95 45 of gears. Figs. l0 and ll are views in secpressed, and yhence is in a condition to throwl tion of the feeding mechanism for the spinthe bell-crank H2 when the depending arm dle, and Fig. l2 is a detail view showing the thereof is moved to either side of the deadclutch mechanism. A y center. When the depending arm of the bell- A f. t The main frameI of the machine is prefer crank H2 and the pin or rodl are inline, the ron 5o ably made in one piece with projecting brackspring, although compressed to a great deets or bosses, to which are secured the sepagree, does not exert any force tending to move the bell-crank H2 on its bearing-stud I-I; but as soon as the alinement of these two parts is broken the bell-crank will be moved by the spring toward either of lthe positions represented by the dotted lines O and P in Fig. l.

Mounted in suitable bearings at the side of the machine is the shaft J2. This shaft is hollow throughout the whole or a portion of its length and carriesa pair of friction-pulleys N and Nor equivalentgear-wheels and the cone driving-pulley N2. Located within the hollow shaft J2 and projecting therefrom at the front end is the shifter-rod J3. This shifterrod is connected at its rear end by any suitable means with clutches J5 of any approved construction, which engage the pulleys N and N for locking them to and releasing them from shaft J2. Pulley N is the forward or feeding pulley, while pulley N is the reversing-pulley, and both are coupled up to shaft J2 by said clutches, so that when one is locked the other is released, and when the shaft J2 is in an intermediate position both clutches are released.

The front or projecting end of rod J8 carries a sleeve M, securely fastened thereto, the said sleeve being provided at its opposite ends with flanges m', (shown in Figs. 7 and 8,) which form abutments for the sliding collar L, mounted on said sleeve. This collar L is made in two parts, as shown in Figs. 6 and 8, to enable it to be readily assembled on the sleeve between the abutment or end fianges thereon and is of considerably less width than said sleeve, so as to permit of a sliding movement thereon between the end flanges or abutments. The collar L thus constructed and mounted is connected by the pintles L thereon with the shifting-lever K, as clearly shown in Figs. l and 6. This lever K is keyed rigidly to stud H', passes upwardly between segments K', and terminates at its upper end in a handle and is provided at its upper end with a finger-lever L2, carrying the locking-bar K2, which latter is designed to engage a notch in the segments K andprevent the upper end of lever from moving forwardly when the locking-bar is in the notch,`

the said locking-bar K2 being normally held against the segments by the spring L2, carried by the lever K and engaging the fingerlever L2.

Vhen the lever K is in a perpendicular position, as shown in full lines, Fig. l, the clutch-pulleys are both disengaged from the shaft J2 and the machine is at rest. When the parts are in these positions, the lockingbar rests in the notch in segments I and the spring L2 above acting thereon holds the parts rigidly in position. By simply disengaging the locking-bar from the segments K' the lever K will be free to be moved either forward or backward, carrying the shipperrod J3 with it, thus permitting the machine to be started, stopped, or reversed at will. The operation of this portion of the machine is as follows: The work to be operated upon is securely clamped by a chuck or other means upon the table A, after which the clamp-collar D should be adjusted on the quill or sleeve D', so that it will through its engagement with the collar E upon the rod F actuate the reversing mechanism at the exact moment when the tap B has reached the desired depth,the actual contact between clampcollar D, with collar E on rod F, taking place some time before the actual stopping or reversing of the machine. As the spindle carrying the tool feeds downwardly the point is reached when the downward pressure on rod G2 shifts or turns stud H sufficiently to break the alinement of the depending arm of the bell-crank lever H2 and the rod I', thus causing the lever K to move in the direction of the arrow Q, carrying with it the collar L, and as the collar L is considerably narrower than the sleeve M between the flanges m and starting from the extreme front or righthand side, with the clutch-locking drivingpulley N clutched to shaft J2, (which is the position of the parts when the machine is started,) the collar will travel some distance on collar M before it engages the opposite flange. Until this contact takes place there Will be no movement of the shifter-rod J3, and the machine will continue its forward movement until said rod has been shifted rearwardly to disconnect the forward pulley and couple up the reverse-pulley. At the start the lever K occupies a position illustrated by the dotted line O in Fig. l, while the depending arm of bell-crank lever H2 projects rearwardly, and held so by the spring I2. As the lever K is forced over in the direction ofthe arrow Q the spring I2 will be compressed until it stands perpendieularly or in alinement with the depending arm of bell-crank H2. With the mechanism properly adjusted the collar L will not make contact with the rear ange of sleeve M until the lever K has passed the central position. As soon as the lever K, or rather the depending arm of bellcrank H2, passes the perpendicular the spring I3 exerts its energy and quickly throws the lever Koverinto the position indicated byline P in Fig. l. The contact between the collar L and sleeve M on the shifting-rod J3 moves the latter rearwardly, thus disengaging pulley N from shaft J2 and clutching the reversing-pulley N', which operates to reverse the machine. As pulley N is driven at a higher rate of speed than pulley N, the spindle is quickly reversed and the tap fed out of the work until it has reached a position where the work can be removed or its position changed without contacting with the tap. This reverse movement of the parts continues until the collar D on spindle makes contact with the stop or collar E on rod F, the said stop or collar E being so adjusted as to engage the collar D at the proper time for stopping the machine. As the shifting mechanism is reversed, as previously explained, and

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the lever K moved in the direction ofthearrow R, (see Fig. 1,) the parts are then so located that the collar L travels forwardly some distance on sleeve M before it contacts with the front or forward iiange of the latter, which, as previously explained, actuates the shifter-rod J s. This rod then moves forwardly until the locking-bar of the lever K engages the notch in Vthe segment K', and when the parts are in these positions both clutches are disengaged from their pulleys N and N' and the machine comes to a stop. The notch is so shaped that it offers no resistance or obstruction whatever to the rearward movement of the lever K, but obstructs it on its forward movement at the time when the clutches are disconnected from the pulleys N 2 and N'. To start the machine again, it is simply necessary for the operator to disengage the locking-bar K2 and give the lever a slight pull forward, and after it has passed beyond the perpendicular the spring I3 eX- erts its pressure and completes or materially assists in completing the throw, which movement, as before explained, clutches up the forward or feed pulley N and starts the machine. In the movements of the bell-crank lever H2 the weight H2 merely acts as a balance to offset the Weight of the parts on lthe other side, so as to balance the moving parts.

The main spindle C, which carries the boring-tool or tap, is provided at its upper end at a point above the frame of the machine with a cross-bar T' or head adjustably or slidingly secured thereto by a key. The ends of this cross-bar rest and travel in slideways T, formed in brackets T2, which latter are secured at theirk lower ends to the driving gearwheel T3, loosely embracing the spindle C and mounted on or in a suitable bearing carried by the top of the machine-frame I, the said brackets being connected together at their top by a suitable yoke. The driving gear-wheel T3 meshes with the vsmaller pinion on shaft T4, and motion is imparted to the latter through the drive shaft ct. The

vobject in Vapplying power to the spindle C through a cros's-headsecured thereto instead of through a gear-wheel secured directly to the spindle C is to reduce the strain to a minimum. In devices wherein the spindle is driven by means of a gear keyed directly to the shaft (the usual manner of driving drill-presses) the strain in heavy work is so excessive that the keys soon wear out; but I find in practice that with the construction shown thisobjection is to a large extent obviated, as the thrust is taken on nearly the same periphery as the teeth of the large gear, which practically eliminates the excessive friction which always occurs when the thrust is taken on a feather or key inside of the hub of the gear.

This machine has two methods of feeding the main spindle-one by means of a belt for such work as drilling and boring and another by means of gears, which latter give a positive feed that cannot slip. This latter is used for tapping, and by means of same any lead corresponding to the thread of the tap can be obtained by changing one gear for each lead, and all the' ordinary leads from four to fourteen can be obtained in this manner.

The driving cone-pulley a' is mounted on shaft ct, 'which imparts movements to the spindle. This cone-pulley a' receives its motion through a belt from cone-pulley N2 and imparts it to the spindle, either by belt or gearing, as previously stated. The gearing comprises a train of pinions from shaft a to shaft b. One of these pinions a2 is mounted on a swinging bracket a2, and by removing this pinion andsubsttuting another and then moving the' bracket to a position where the substituted pinion engages its coacting pinions the lead will be changed.

The shaft b has secured to it a worm located within the casing b3. (Shown in Fig. 1. This worm engages a worm-gear c, (shown in Fig. 11,) fast on shaft c, which latter passes transversely through the frame of the machine and is provided on its opposite end with a bevel-pinion c2, which engages a similar pinion c4 on sleeve c5. This sleeve is mounted in bearing c6 and is provided at its front end with clutch-teeth o7, which are designed to be engaged by the sliding clutch cs, mounted to slide on shaft ci. This clutch c2 is actuated by hand-lever c2 and operates to lock pinion` o4 to the shaft d. Shaft d also carries the worm e, which meshes withthe worm-gear F',

secured to the shaft f', which also carries the pinion g, which directly engages the rack h on the quill or sleeve D', which, as previously stated, embraces the spindle, butis restrained againstlongitudinal movementthereon. The shaft d is supported at its front end in the tipping-box U, which latter is carried by the tipping-box frame U', pivoted at its rear end` on shaft c'. This tipping-box is 'normally supported and sustained with the worm e on shaft d in Contact with the worm-gear F by the lever V, which latter is pivoted to the frame of the machine below the tipping-box and extends upwardly in a position to be engaged by the latch V', also pivoted to the machine-frame. The forward end of latch V' is connected to lever V2 by a link V2', and the forward end of lever V2 rests in a position to be engaged by the projection on collar D2,

Which, as previously explained, is carried by the quill or sleeve on the spindle.

When the machine is used for tapping, `the collar E' (the lower one on rod F) is adjusted so that the clamp-collar D engages with it and reverses the machine before the collar D contacts with the lever which trips the worm con the shaft d out of mesh. Thus the mechanism can be set to operate without disengagf ing the worm-feed at all if it is desired 'to have the tap fed out by power. If'it is desired to have the automatic return-feed dise engaged, the collar E' can be set low enough Vroo IIO

on the rod F so that the clamp-collar Dr will g not engage it at all, but will trip the lever' and release the worm from the worm-gear. The machine could then be reversed by hand and the tap allowed to feed out by means of its own threads.

When it is desired to use the machine for drilling and boring, the collar E should be set low enough on the rod F to be out of the way entirely and the reversing-gear made non-operative. This will allow the collar D to contact with the trip-lever at the desired moment and release the automatic feed.

Either the belt or gear feed can be used for boring, and the automatic stop will operate with either.

This construction of screwshaft, screw tipping-box, and lever for holding same are fully disclosed in my Patent No. 599,551, dated February 22, 1898, and as the operation of these parts is fully disclosed in this patent a further specific reference to the construction or operation is not considered necessary to a full understanding of the invention herein claimed.

Vhen it is desired to feed the spindle by means of a belt, the gearing is disconnected at the rear by simply loosening the stud which holds the bracket (t2 iu place. This disconnects the shaft a from shaft b. On the front end of shaft b is secured a small conepulley IV, which is connected by a belt to shaft a by another small cone-pulley W. Hence with the belt in place on the cones and the gearing disconnected it will be seen that the feed of the spindle will be transmitted through the belt to shaft b and from` the latter to the spindle by the mechanism already described. Secured on shaft b is a pinion W4, which engages with a smaller pinion on parallel shaft W75. The small cone-pulley WV is designed to be secured to either the shaft l) or shaft W5, and when on the short shaft the feed is compounded and rendered more powerful and is used for taking heavy cuts. When a faster feed is wanted, the pulley is removed from shaft W5 and placed directly on shaft h and the belt connecting the small cone-pulleys crossed. The shaft d carries the bevel-gear Y, which meshes with bevel-gear Y', fast on the short shaft Y2. This short shaft is suitably mounted in the frame of the machine parallel with the spindle O and carries at its upper end the pinion T4, which latter engages the main driving-pinion T3,which, as previously explained, rotates the spindle C, which is counterbalanced by a weight in the ordinary manner.

With the machine as above described the motions of the several parts are after starting entirely automatic in their operation, thus permitting the operator after he has started one machine to leave it and give his attention to others. These automatic devices stop the tap when it has reached a predetermined depth, reverse the direction of rotation of the spindle, feed the tap out of the work, and then stop the machine.

It is evident that many slight changes and alterations might be resorted to in the relative arrangement of parts herein shown and described without departing from the spirit and scope of my invention. Hence I would have it understood that I do not wish to confine myself to the exact construction herein shown and described; but,

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination in a boring and tapping machine, of a driving-shaft, reversing mechanism for said shaft, a hand-lever for actuating said reversing mechanism, devices actuated by a moving part of the machine for imparting initial impulses to the hand-lever, spring mechanism for continuing the movements of said lever, and means for automaticallylocking the lever in a position with both clutches disconnected, after the machine has completed one full movement of its parts.

2. The combination in a boring and tapping machine, of a driving-shaft, reversing mechanism thereon,alongitudinally-movable rod for actuating said reversing mechanism, a flanged sleeve on said rod, a collar constructed yto slide on the sleeve between the flanges, a hand-lever connected to said collar, means connecting a moving part of said luachine with the hand-lever for imparting initial impulse thereto and spring mechanism for continuing the movements of said lever.

3. The combination in a boring and tapping machine, of a driving-shaft having loose pulleys thereon, clutches for said pulleys, a sliding rod having a flanged sleeve thereon, a sliding collar on said sleeve, a hand-lever connected to the sliding collar, an arln movable with the lever and projecting below the axis of the latter, a spring arranged with its long axis in line with the long axis of the lever and arm, when the latter are perpendicular, and means connecting said lever and a movable part of the machine whereby initial starting movement is imparted to the lever.

4:. The combination in a boring and tapping machine, of a hand-lever fixed to a stud, a bell-crank lever also fixed to said stud and provided with a forwardly-proj ecting arm carrying a weight, and a depending arm arranged in line with the hand-lever, a spring arranged with its long axis in line with said lever and arm when the latter are perpendicular, a driving-shaft, reversing mechanism thereon, a sliding rod connecting said reversing mechanism and the hand-lever, and mechanism connecting the latter and a moving part of the machine, whereby initial starting movement is imparted to the hand-lever.

5. The combination in a boring and tapping machine, of a driving-shaft having reversing mechanism thereon, shifting-rod for the reversing mechanism, a hand-lever and a bell-crank lever fixed to a pivoted stud, a sliding connection between the hand-lever and the shifting-rod whereby the former can move IIO a limited distance Without transmitting its I. In testimony whereof I have signed this movement to the latter, a Weight on the bell; specification in the presence of two subscribcrank lever, spring mechanism substantially ing witnesses.

as described connected to the depending arm LESLIE H. COLBURN. 5 of said bell-crank lever, and a spindle and in- Witnesses:

termediate means actuated by the spindle for H. W. BREOKENRIDGE,

.rocking the pivoted stud. W. E. BARROW.

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