US916646A - Machine for turning crank-pins. - Google Patents

Description

W. E. ANDERSON.

MACHINE FOR TURNING GRANK PINS. APPLIoATIoH HLED JULY 11.1907.

Patented Mar. 30, 1909.

' l 4 zsHBBTssHnET W. E. ANDERSON. MACHINE POR TURNING GBANK PINS. APPLICATION FILED JULYll, 1907.

916,646. Patented Mar. 80, 1909. j 2 BREW-SHEET 2. 4 j 9'( M Id j Unir WALTER E. ANDERSON, OF LOS ANGELES, CALIFORNIA..

MACHINE FOR TURNING @RANK-PINS.

Specification oi Letters Patent.

Patented March 30, 1909.

Application filed July l1, 1907. Serial No. 383,324.

To all 'whom it may concern.'

Be it known that I, VALTER E. AnnunsoN, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Machine for Turning Crank- Pins, of which the following is a specilication.

This invention relates to a machine .for turning crank pins, and the objects of the invention are to provide a machine of the character described which is compa atively simple in construction, eii'ective in operation, and which can be applied to a lathe of any well known type without material alteration of the lathe.

Another obect is to provide for turningcrank pins on a shaft having' cranks set at 120 degrees or any degrees apart.

Another object is to provide for removing the crank shaft after one pin has been turned and replacing the crank shaft in the machine in position for turning the next piu without resetting the machine, thereby insuring that the pins will all be turned in line and have the same throw.

Another object is to provide means for quickly setting the machine without making measurements to turn a pin on a crank of any desired throw within the limits of the machine.

Another obj ect is to provide an improved centering device and means for more securely clamping the crank in position.

Other objects relate to details of construction and arrangement which will be hereinafter described.

Referring to the drawings :*Figure l is a plan View of a lathe equipped with the invention, a crank shaft having three cranks being shown in position ready for turnino'. Fig. 2 is a front elevation of what is shown in Fig. l. Fig. 3 is a section on line ac3-4:3 Fig. l. Fig. 4 is an enlarged section on line m4*m4 Fig. 6. F ig. 5 is a section on line :aL-m5 Fig. 4. Fig. 6 is a section on line c-6 Fig. et.

l designates the lathe bed having ways 2 upon which is mounted the apparatus comprising the invention. The apparatus consists of two or more units. For example, if a single throw crank pin is being turned, only two units would be employed which would be ,constructed right and left, while if the crank was a long crank shaft or had two or more cranks, a third unit would be employed as indicated in Figs. l and 2. inasmuch as these units are similar in construction, one only will be described.

Figs. 1lto 6 show the detailed construction of a unitwhich comprises a circular casing 3 which consists of two members Ll and 5, both substzstially the same in construction except that the casing 5 has a broad foot which is grooved on its under side and slidably mounted on the ways 2 of the lathe, be-

ing adjustably held in position thereon by a' clamping plate G fastened by bolts 7. As clearly shown in Fig. 5, 'the casing fl at the bottom has a foot 8 which rests in a seat formed in the casing 5 and a key 9 locks the member el against lateral movement on the member 5, and an annular space or groove .l is formed between the edge of the member -t and a shoulder on the member 5. The two members l and 5 are not continuous rings but cach have a segmental gap at the top which is bridged by a cap ll, the latter serving to space thc two members i and 5 apart at the top and also to hold them together and when in place makes them in cffect each a complete ring, the cap l1 being grooved to form a continuation of the groove lO. rlhe members il and are further prevented from spreading by intermediate straps l2 which are bolted to the members at diamctrically opposite points, as shown in Figs. et and G. Each member 4 and 5 is provided with a lug or bracket 13 forming a journal for a shaft le. rl'he shaft 14, as shown in Figs. l and 2, extends parallel with the lathe, and its head end is mounted in thc bracket l5 which is attached to the head of the lathe, the shaft 14 having a pinion 16 which meshes with the usual large gear 17 on the lathe spindle.

Mounted between the two lugs 13 of the associated members et and 5 is a pinion 18 splined on the shaft l-'l which permits the unit to be shifted along the lathe bed to the position desired.

lilounted to rotate in the members l and 5 is a chuck designated, in gene al, 19 which comprises a disk having on its periphery an external gear 20 which rides in the groove l0, the ends of the teeth clearing the cap ll and solid portion of the member 5 as shown in Fig. -l-, and the gear 2O meshes with the pinion 18 and is revolved thereby. The chuck 19 has a radial slot 2l which extends more than half way through the disk, as clearly shown in .F ig. 4c, and each wall of the lli) slot 21 is provided with a way 22 and at intervals notches 23 forming seats are formed transversely at the edges of the slot 21, as clearly shown in Figs. s and 5. rEhe slot- 21 is bridged and closed by a cap 24C which is detachably secured in place by bolts 25, and the outer face of the cap 211 is provided with teeth to complete the gear 20. Slidably mounted in the slot 21 on the ways 22 is a pair of jaws and 2.7, each jaw having a V-shaped recess to receive and clamp the shaft designated 28 by dotted lines in Fig. l, the crank pin being designated 29. A. bridge bar 30 which is adapted to be received in any of the seats 28 is provided and a pair of adjusting bolts 81 with lock nuts passed herethrough and enter the seats in the inner aw 2T and serve to adjust the inner jaw, which adjustment may be facilitated by providing graduations on the disk 19 adjacent the ways To clamp the jaw 27 in place after it has been adjusted, clamping bolts 3S are provided which are screwed in the jaw 27 and pass through slots 3&1 formed in the raised walls on each side of the slot 21, see Figs. 5 and 6. ly employing several seats 23 it is possible to adjust the bridge bar 3() to shift the 2'4"' to various positions for different throws of cranks, and the length of the adjusting screws 31 is sufficient to enable the jaw 27 to be adjusted to any peint along the slot 21. rlhe jaw 27 is also provided with an eXtra set of threaded holes 85 which enables the jaw to be shifted to engage with bolts 83 when the latter reach the ends of their slots. rlhe outer jaw '26 is connected with the inner jaw 27 by bolts 36, by means of which the crank shaft 28 may be clamped between the two jaws, and in clamping the same in place the inner jaw 27 is first set in the proper position which may be readily determined as above described, and then the outer jaw 26 is screwed into place.

In order to positively hold the crank shaft from swinging around in its seat between the jaws 26 and 27, means are provided between which the crank may be received and clamped to hold the crank pin 29 concentric with the chuck. This means comprises a pair of clamping screws 3T arranged on opposite sides of the slot 21, each clamping screw 37 being threaded in a bracket 38 and each clamping screw 3"( being provided with a lock nut. The brackets 38 are secured adjustably in place by two bolts 39 and a third bolt 10, see Figs. a and 6, the heads of bolts 39 sliding in under-cut slots l1 and the bolt e0 sliding in an under-cut slot 42. The bolts 39 and 40 hold Vthe bracket 38 down fiat against the disk 19 and in a measure prevent the bracket 38 from sliding, but to positively insure the bracket against slipping, a series of seats 43 are provided as clearly shown cesses,

in said recesses, two clamping in Figs. l and 6, and key L14; which engages in the seat in the bottom of the bracket 3S is adapted to engage in any of the seats e3. By this means the bracket 3S may be roughly adjusted, after which the screws may be screwed up to give the final adjustment and clamping of the crank to bring the crank pin 29 in a central position. ln case a crank pin is being turned which is mounted on a disk instead of on straight bars, as shown, the disk of the crank may be clamped tc the chuck 19 by bolts and plates not shown, which bolts may be engaged with any of the under-cut slots in a manner similar to which work is clamped to the face plate of a lathe or to the table of a drill press.

ln operation, the units being assembled on the lathe bed, the crank shaft is inserted in the slots 21 by first removing the caps 11, 21 and outer 27 being set to the desired point the shaft is clamped in place in two of the adjacent units as shown in F ig. 1, the caps 11 and 21 being replaced. 1n lfig. 1 t-he eXtreme right hanf unit acts as a steady rest to support the outer end of the shaft. he ordinary carriage and tool post, not shown, are Miounted as usual on the ways anl lie between the two left hand units, and the shaft 1s being revolved through the medium of gears 16 and 17 in turn imparts rotation to the chucks through the medium of pinions 1o and gears 20, thus driving the crank shaft and rotating the pin to be turned on the center line of the lathe. The right hand unit, it will be observed, also acts to drive the crank shaft in addition to performing its function as a lsteady rest.

What I claim is 1. In a crank pin turning machine, a bed, a radially slotted disk rotatably mounted thereon, the sides of said slot being provided with cppositely disposed pairs of rea bridge piece adapted to be removably seated in said recesses, and clamping means adjustably connected with the bridge piece.

2. ln a crank pin turning machine, a bed, a radially slotted disk rotatably mounted thereon, the sides of said slot being provided with oppositely disposed pairs of recesses, a bridge piece adapted to be removably seated jaws adjustably seated in said slot, one of which is adjustably connected with the bridge piece, and means for locking the last mentioned jaw in its adjusted position. I

3. ln a crank pin turning machine, a work driver adapted to be clamped to a lathe, and comprising a disk with a radial slot, the walls of which are each provided with a series of notches, a bridge-bar adapted to seat in the notches, a pair of jaws slidable in the slot, adjusting screws in the jaws 26, and the inner jaws bridge-bar engaging the inner jaw, clamping bolts engaging the inner jaw and slidable in slots in the disk, clamping bolts con necting the inner and outer jaws and means for rotating the disk.

Ll. In a crank pin turning machine, a Work driver comprising a rotatable, radially slotted disk having raised walls at the sides of said slot, said walls being slotted longitudinally at right angles to the radial slot, inner and outer clamping jaws adjustably mounted in said radial slot, means for adjusting said aws, bolts through the slots in said walls engaging with the inner jaws for holding them after they have been adjusted, and means for rotating the disk.

5. In a crank pin turning machine, a work driver adapted to be clamped to a lathe, and comprising a disk with a peripheral gear and having a slot closed by a removable gear section, jaws slidable in the slot for clamping the crank shaft, a casing in which said disk revolves comprising two rings with segmental gaps, a cap closing both gaps, the rings forming an internal annular groove which receives the gear of the disk, and straps connecting the two rings at diametrically opposite points.

6. In a crank pin turning machine, a work driver comprising a casing, a disk revoluble in the casing and having a radial slot, jaws slidable in the slot, the disk having undercut slots extending at right angles to the iirst slot, brackets with bolts engaging the underl cut slots, and clamping screws in the brackets for engaging the crank.

7. In a crank pin turning machine, a work driver comprising a casing, a disk revoluble in the casing and having a radial slot, jaws slidable in the slot, the disk having undercut slots extending at right angles to the irst slot,brackets with bolts engaging the under cut slots, clamping screws in the brackets for engaging the crank, key seats in the disk, and a key in each bracket adapted to engage in the key seats.

8. In a c ank pin turning machine, a work driver comprising a casing slidable on a lat-he bed, a disk in said casing having a main slot to receive the crank shaft, and jaws on said disk for clamping the crank pin to the disk, the disk having slots parallel with the main slot, bolts extending through said slots and engaging the inner jaw, the inner jaw having extra pockets threaded to receive the latter bolts.

9. driver for a crank pin turning machine comprising a rotatable disk having a shouldered, radial slot extending from its periphery to a point past its center and having parallel, undercut slots in its face adj acent to and parallel with the inner end of said radial slot and oppositely disposed undercut slots adjacent to the center of the disk and at right angles to said radial slot, a portion of said last mentioned slots being provided with seats.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 3rd day of July 1907.

vWALTER E. ANDERSON. In presence ot'- GEORGE T. HACKLEY, FRANK L. A. GRAHAM.

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