US1326783A - Quartering attachment for driving-wheel lathes - Google Patents

Description

S. W. PUTNAM. 3D

OUARTEBTNG ATTACHMENT FOR DRIVING WHEEL LATHES.

APPLICATION FILED MAY I6, i919... l

Patented Dec. 30,1919.

5 SHEETS-SHEET I.

Y S. W. PUTNAM. 3D. QUARTERTNG ATTACHMENT TGR DRIVING WHEEL LATHES.

APPLICATLON FILED'MAY I6. 1919. .Y

Patented Dec. 30,1919.

5 SHEETS-SHEET 2 i s'. w. PUTNAM, so. QUARTERING ATTACHMENT FOR DRIVING WHEEL LATHES.

. I APPLICATION FILED MAYI, I9I9. 1,326,783i `Patented Dec. 30,1919.

5 SHEETS-SHEET 3.

S W PUTNAM 3D QUARIERING AHAGHMENTZLFOR nmvlNG WHEEL L MHES.

APPLICATION EILL'ED MAY 16| 1919.'

Patented Dec. 3 0, 1919.

s SHEETS-SHEET 4.

v1,326,7fs3.

Y v i b h h h v S. W. PUTNAM-,3.1). QUARTERiNG ATTACHMENT EUR DRIVING WHEEL LATHES.'

APPLICATxoN FILED MA.Y1.6,1919..

1 ,326,783. Patented Dec. 80, 1919.

5 SHEETS-SHEET 5.

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UNITED STATES PATENT OFFICE.

SALMON W. PUTNAM, 3D, OF ROCHESTER, NEW YORK, ASSIGNOR TO ARTHUR H. INGLE, 0F ROCHESTER, NEW YORK.

Specication of Letters Patent.

Patented Dec. 30, 1919.

Application led May 16, 1919. Serial No. 297,482.

To all u2/wm t may concern:

Be it known that I, SALMON W. PUTNAM, 3d, a citizen of the United States, and resident of Rochester, county of Monroe, State of New York, have invented an Improvement in Quartering Attachments for Driving-VVheel Lathes, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts in each of the several views.

This invention relates to attachments for metal working lathes, particularly of the n type employed for finishing the driving wheels of locomotives. The finishing of locomotive driving wheels involves, besides the turning operations concentric with the wheel axis, the further operatioiis of boring and iinishing holes in the respective wheels to receive the crank pins for the connecting rods, these crank pins being spaced radially away from the wheel axis varying distances for diii'erent engines, according to the length of the piston stroke in any particular case. Since these crank pin holes are spaced angularly 90 apart on the respective driving wheels on a given axle, the operation of boring and finishing these crank pin holes is commonly known as quartering and apparatus for the purpose is known as a quartering attachment.

For this quartering operation, special machines have been developed and supplied, but since these machines must be relatively massive to handle the heavy work with a resulting large cost, which has been disproportionate to the amount of work involved, it has been sought to dispense with a special machine for the crank pin hole turning, or

uarterino' and to e ui the drivin@ wheel v lathe itself with an attachment to perform this operation with the pair of driving wheels held on the lathe centers, the same as they are mounted for the turning operations. This has involved the slotting and consequent weakening of the face plate of the lathe, to permit the fitting therethrough of a boring bar bearing at its inner end a cutting tool for finishing the crank pin hole. Since, in order to be of general utility, such an attachment must be capable of boring crank pin holes for engines of relatively short stroke, z'. e., with the crank pin relatively near the axis aswell as for longer stroke engines, this has necessitated an elongated radial slot in the face plate, extending downwardly relatively close to the axis with a resulting weakening of the face plate, and particularly of the front spindle cap or bearing, which has to be cut away materially to allow clearance for the boring bar. This necessary cutting away of the front spindle bearing cap and of the face plate to adapt the driving wheel lathe for a quartering attachment has thus materially impaired the serviceability of driving wheel lathes for their primary purpose of finishing driving wheels and rendered them much less able to withstand the enormous strains incident to the turning of tires.

The object of the present invention is to provide a quartering attachment which may be conveniently applied to a driving wheel lathe in a manner so that the bearing cap is not at all cut away or weakened and where the slot in the face plate is farther away from the axis than heretofore, these results being obtained by providing separate centers offset from the lathe centers and adapted to be applied to the lathe spindles when the machine is to be used for quartering, it being understood that the lathe spindles are then locked stationary.

The foregoing and other objects and advantages of the invention will be better understood from the following detailed description, taken in connection with the accompanying drawings and the distinctive features of novelty will then be pointed out in' the appended claims.

Referring to the drawings,

Figure 1 is a lengthwise vertical section, showing a driving wheel lathe equipped with a quartering attachment;

Fig. 2 is an enlarged transverse section thereof, on line 2 2 of Fig. l;

Fig. 3 is a lengthwise vertical section, corresponding to Fig. l, but showing the lathe equipped with the olf-set auxiliary centers and with the special mounting of the quartering attachment involved in my invention;

Fig. l is an enlarged transverse section on line 4-4 of Fig. 3;

Fig. 5 is an elevation, showing a pair of driving wheels fixed on a common axle and being the work with which the invention is concerned ;l

Fig. 6 is an end view of looking from the left in Fig. 5; and

Fig. 7 is an end view, looking from the right in Fig. 5.

`The work operated on by the present the driving wheel,

mechanism is illustrated in Figs. 5, 6 and 7 asa pair of locomotive driving wheels 10, 10u fixed as usual on an axle 11. These driving wheels have their cranks 12, 12a set ninety degrees apart and hence the operation of boring the crank pin holes 13, 13a therein is commonly known in the art as quartering, This operation of boring the crank pin holes is sometimes performed on a machine specially designed for the purpose with rotarily driven boring bars offset the required distance from the lathe centers but on account of the heavy character of the work the cost of such a machinehas been in most cases disproportionate to the amount of work of this kind in hand. rlhere has hence been a demand for a quartering attachment which might be applied to the regular driving wheel lathes but such attachments as heretofore proposed have been subject to the objection that in order to mount the boring bar with a capability of radial adjustment so as to bring it near enough to the lathe axis for boring crank pin holes in relatively short stroke engines, c. g., a twenty-two inch stroke which would require the boring bar to be positioned eleven inches from the lathe centers, the top portion of the bearing cap of the lathe spindle has to be cnt away so much to afford clearance for the boringbar as to seriously weaken the lathe and render it unreliable for withstanding the enormous strains incident to its primary purpose, i. c., the turning of the wheel tires. lt has also been necessary to slot the face plate inward to the central hole thereof weakening thisalso. ln Figs. 1 and 2 l show a lathe bed 1l equipped with spaced apart columns 15, 1G in which are rotatably mounted spindles 17 18 respectively equipped with usual. centers 17,.18 for positioning the axle 11 with the driving wheels 10, 10 thereon. lThe spindles 17, 18 have fixed at the inner ends thereof the face plates 19, 2O respectively. these face plates having gears 19, 20n carried thereby to ac tuate the same for turning tires and the like by driving connections of usual character, that having no relation to the present invention are not shown herein. lWhen the machine is to be used for quartering purposes the face plates 19, '20 are locked stationary and for this purpose l show looking pins 21 adapted to engage in holes of the face plate, these pins being slidably mounted in fixed blocks 22 of the base. v3 indicates a boring bar equipped with a cutting tool 23a for boring the crank pin holes. rFhis bar is journaled in bearing blocks 24s. 25 adjustably mounted in standards Q6 on the column. 15, the particular means for adjusting these blocks simultaneously being shown as screws 27 journaled in the respective standards 26 and engaged with the respective blocks 24, 25, the tops of these screws having beveled gear connection 28 with a common shaft 29 journaled at its ends in the two standards 26 and having a hand wheel 30 thereon to actuate the same. The shaft 23 has a key way along the outer end portion thereof and it is slidably fitted and held to turn with a sleeved gear 31 which is keyed thereon, the gear 31 being driven by a pinion on a shaft 32 which has a driving belt wheel 32 fixed thereon. By suitable mechanism not shown and which forms no part of the present invention the boring bar or shaft 23 is provided with a means for power feeding and hand motion laterally in one or both directions.

The bearing caps for the spindle 17 are shown at 33, 33a at the top of the column 15. For adjusting the shaft 23 inward toward the lathe axis far enough to bore the crank pin holes of short stroke engines the bearing cap 33 has to be cut away as indicated at 34 to an extent that in practice,

and as shown, leaves only half or less of the normal thickness of the cap at the top thereof to resist the operative strains thereon which in turning tires are very great since the engagement of the tool of the work is such a long, distance radially outward from the spindle bearing. The face plate also requires to have an elongated radial. slot 35` therein extending inward to the central hole thereof to permitthe requisite range of adjustment of the bar Q3 for the crank pins of different stroke engines, thus materially weakening the face plate also.

In accordance with the present invention and as shown particularly in Figs. 3 and l I provide support heads 36 adapted to be fitted in place at the inner end of the spindles 17, 18 and within the axial passage of the face plates, these heads bearing auxiliary centers 37 thatare offset with reference to the lathe centers 17, 18 which are then withdrawn within the spindles so as to be out of the way. The axle 11 of the driving wheels to be quartered is mounted on these auxiliary centers which are located in angular alineinent either directly over or obliquely disposed to the axis of the spindies. In this way-the crank pin holes are positioned substantially farther from the lathe axis and hence the boring bar is correspondingly removed from the bearing caps of the spindles. In this construction the standards 38 are fixed to the side of the column 17 in like manner as the standards 26 already described and the means for vertically adjusting the boring bar 23 being in all respects similar to that already described need not be again detailed, the same reference characters being applied to the same parts. Thebearing blocks 241 forthe boring bar in this cas@ clear the top cap 33 of the spindle bearing so that this does` not require to becut away or reduced at all to 'afford the full range of adjustment necessary for the boring bar. Also the slot in the face plate does not have to extend entirely to the spindle passage of the face plate. It is to be noted that while only one of the spindie columns is shown equipped with the quartering attachment of the invention, that either one or both columns may be so equipped within the contemplation oi the invention, the equipment of only one column in this way, requiring that the wheels be reversed after boring the first hole. In cases where a quartering attachment is applied to both of the spindle columns so that both holes may be bored without shifting the Wheels, the boring bars should he positioned ninety degrees apart, the boring bar located on the tail stock column being preferably arranged for horizontal radial adjustment while the bar on the head stock column would be equipped for vertical adjust-ment. It will be understood that as previously suggested when a tire turning lathe as described is employed for boring the crank pin holes, it ceases to be a lathe in the full sense of the word and becomes to all intents and purposes a quartering machine, the lathe proper acting simply as a means of holding or sustaining the Wheels in proper position for boring the crank pin holes. The present improvement permits the construction of the lathe having maximuni eliiciency as a tire turning machine and oneI that without change is capable of utilizing the quartering `attachment for short stroke engines without cutting away the bearing cap or in any other way weakening' the lathe or impairing its eliiciency for heavy duty work. lVhile I have herein shown the support heads 36 for the auxiliary centers as fitted in the axial holes of the face plate with the centers eccentric on the heads, it is to be understood that this showing is merely illustrative and that any other suitable or convenient ,manner of mounting these auxiliary centers in offset relation to the regular latheI centers might be employed. In this as well as other particulars the present embodiment is to be understood as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description to indicate the scope of the invention.

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

l. Apparatus of the kind described, comprising a lathe equipped with a face plate and an axial center for holding work, a boring tool mounted in parallelism with and at one side of said center extending through said face plate to bore crank pin holes, and an auxiliary center adapted to be mounted in oifset relation to said axial center.

2. Lathe mechanism, comprising work centering and driving means including an axial center, a boring device mounted to operate at one side of said center and in parallelism therewith, and an auxiliary center adapted to be applied in offset relation to said axial center for the purpose stated.

3. Lathe mechanism, comprising work centering and driving means including an axial center, a boring bar mounted in parallelism with said center and for radial adjustment with respect thereto to bore crank pin holes or the like, and an auxiliary center adapted to be mounted in oliset relation to said axial center for the purpose stated.

4. Lathe mechanism, comprising a face plate, an axial center associated therewith, means for locking said face plate stationary at will, a boring bar mounted in parallelism with said axial center and at one side thereof for radial adjustment with respect thereto, and an auxiliary center adapted to be applied in offset relation to said axial center for the purpose stated.

5. Lathe mechanism, comprising work centering and driving means, an operating tool mounted for adjustment toward and from said axial center, an auxiliary center adapted to be applied in offset relatign to said axial center, and means for locking said work driving means stationary at will.

6. Apparatus of the kind described, comprising a pair of spaced apart work driving face plates, a pair of axial centers associated therewith for centering the work, a boring har mounted at one. .side of said axial centers and in parallelism therewith, and a pair of auxiliary centers adapted to be. applied in oii'set relation to said axial centers for the purpose stated.

7. Apparatus of the kind described, comprising a pair of spaced apart work driving face plates, a pair of axial centers associated therewith for centering the work, a boring bar mounted at one side of said axial centers and in parallelism therewith, and means applied to said face plates bearing centers offset with relation to said axial centers.

In testimony whereof, I have name to this specification.

sALMoN w. PUTNAM, en.

signed my

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