US1431919A - Crank-shaft lathe - Google Patents

Description

H. BAERBALCK.

CRANK SHAFT LATHE.

APPLICATION EILED NOV-21,1919- RENEWED JULY 31,1922.

1,431,919. Patented Oct. 17,1922.

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H. BAERBALCK. CRANK SHAFT LATHE. APPLICATION man NOV. 21, 1919. RENEWED JULY 3|. 1922. 1,431,919.

Patented Oct. 17,1922.

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b CRANK SHAFT LATHE. APPLICATION FILED NOV. 21, I919- RENEWED JULY 31, 1922.

Patented Oct. 17, 1922.

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lll l II i. BAERBALCK. ChANK SHAFT LATHE. APPLICATION FILED NOV. 2|. 1919. RENEWED JULY 31,1922. 919, Patented Oct. 17, 1922.

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Patented Get. 17, 1922.

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HANS IBAERBALGK, OF HAMILTON, OHIO.

CRANK-SHAFT LATHE.

Application filed. November 21, 1919, Serial No. 339,641. Renewed July 31, 1922. Serial No. 578,846.

To all 107mm it may concern:

Be it known that I, HANs BAERBALOK, a citizen of Germany, residing at Hamilton, in the county of Butler and State of Ohio, have invented certain new and useful Improvements in Crank-Shaft Lathes, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention aims to provide a crank shaft lathe and finishing machine constructed somewhat on the principle of an ordinary lathe and embodying many structural features which contribute to an expeditious and economical treatment' f crank shafts or pieces of work adapted to have intermediate portions thereof rough, fine or otherwise finished.

First, the machine includes novel means for placing work holders in proper alinement with each other and also with a power shaft, so that when-a piece of work is being operated upon there can be no twisting action or dissimilarity in-any operations simultaneously performed on a SlIlglG'PlBCG of work. For 1nstance,'m the cutting and finishing of the crank portion of a crank shaft it is essential that all bearing surfaces be evenly and uniformly finished, particularly those offset bearing portions which must positively have the axes thereof in parallelism.

Second, the machine includes a positive and reliable means for automatically shifting tools to and from a piece of work besides feeding the tools when in en gagement with a piece of work and-1 the mechanism employed for this purpose is constructively arranged so that the feeding of the tools may be at difierent speeds. For instance, the speed at which the tools are moved into and out of operative relation to a piece of work is much faster than the speed at which tools are advanced when actually operating on the piece of work, and in this manner production is materially increased compared to a machine having but one tool feeding speed. Provision is also made for automatically regulating the speed of the machine and for automatically 'disconnecting the power relative to the machine, so it is possible for an operator or attendant of a machine to start the same and in the meantime give his attention to others.

Third, the machineis designedlso' that it may used for other purposes than that of rough or fine finishing a piece of work,

as the character of the work performed all depends 011 the nature of the tools used in the machine.

The above are some of the salient features of my invention and others will appear 'when reference is had to the drawings and a detailed description thereof, and in describing my invention it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the claims which same;

Fig. tis a front elevation of the machine;

Fig. 5 is a cross section'alview taken on the line IVIV of Fig. t;

Fig. 6 is alongitudinal sectional view of the same;

Fig. 7 is a cross sectional view taken on the line VIL-VII of Fig. 6, and

Fig. 8 is a side elevation of a the machine.

The machine comprises a-bed or frame 1 having a longitudinal opening 2 and at the rear edge of the frame is a-shear or way 3 throughout the length thereof, while at the front edge'of the frame is a short shear or way 4c with a rack 5 on the lower face thereof.

Seated on the ends of the frame 1 and adadjustable thereon are what may be considered head and tail stocks which are practically identical in construction, so I deem portion of it only necessary to describe one of said stocks in detail. Each stock comprises parallel bearings '6 and 7 that rest on the plain front edge of the frame land the shear or way 3 at'the rear edge of said frame, and journaled in said bearings is a longitudinal stepped shaft Shaving a head 9' at the inner end thereof and a reduced exteriorly screwthreaded" shank 10at the opposite end there- 'of, the shank being providedwith retaining nuts 11 to cooperate with the head 9, the

bearings 6 and 7, and-the stepped portions of theshaft in preventing the longitudinal displacement of said shaft relative to the bearings 6 and 7 which are maintained in for rotation therewith, between the bearings 6 and 7, is a hub portion 12 of a spider 13, said spider having its arms bifurcated or forked, as at 14, to receive lugs 15 carried by the face of a herring bone gear 16 which surrounds the hub portion 12 of the spider 13 and is clamped against said spider by nuts 17 screwed on the hub .portion 12 of the spider, as best shown in Fig. 6. The lugs 15 of the gear 16 has stud bolts 18 extending through the bifurcated ends of the spider and held in engagement therewith by nuts 19 so by loosening the nuts 17 and adjusting the nuts 19 it is possible to shift the herring bone gear relative to the spider 13 and the shaft 8.

Attached to the head 9 of the shaft 8, by screw bolts 20 or other fastening means is i the head 21 of a crank shaft holder 22, said holder being channel shaped, as best shown in Fig. 5, so that the end of a crank shaft may be set therein and held by clamping devices, generally designated 23, said devices holding the crank shaft rigid relative to the holder with pin portions 24 of the crank shaft 25 in axial alinement with the shaft 8, so that when the shafts of said head and tail stocks are driven the pin portions 24 of the crank shaft 25 will be revolved in the axes of the head and ta-il'stocks.

Suspended from the bearings- 6 and 7 of each stock by tie rods or screw bolts 26 are the end pieces 27 of gear housings 28, said gear housings longitudinally alining so that a power shaft. 29 may be journaled in said housings and provided with herring bone gears 30 meshing with the herring bone gears 16. One end of the power shaft 29 has a large gear wheel 31 representing a suitable power transmission wheel so that the power shaft 29 may be driven from a motor or suitable source of power.

Interposed between the bearings 6 and T and the gear housings 28 are longitudinally disposed tapered keys 32 that may be shifted by screws 33, carried by the bear ings 6 and extending'into grooves in the keys 32. By rotating the screws the keys 32 may be shifted, after the tie rods or screw bolts 26 are loosened, so that the gear housings 28 may be adjusted relative to the bearings 6 and 7 and thus insure a proper mesh of the gears 16 and 30. Itis through the medium of the keys 32 that the gears 30 may be adjusted relative to thegears '16 to compensate for any wear, and it is through the mediumof the spiders 13 and the bolts 18 that the gears 16 may be circumferentially adjusted and cause the shafts 8 to place the crank shaft in proper position;

Slidable on the shears or ways 3 and 4 of the frame 1 is a 'bed plate 34 having a depending apron35 atone side of the frame 1 and said "apron'su-pports a pinion shaft 36 having a pinion 37 and a hand wheel 38, said pinion meshing with the rack 5 so that when the hand wheel 38 is revolved the bed plate 34 may be shifted longitudinally of the frame 1.

Slidable transversely of the bed plate 34 and having a tongue and groove connection therewith is a table 39 supporting adjustable tool holders 40 for tools 41 and 42, said tools being disposed in sets and positioned to alternately operate on the pin portions 24 of the crank shaft 25,'the tools being moved into and out of engagement with the crank shaft or piece of work by sliding the table 39 on the bed plate 34. The construction and mechanism contributing to such a movement of the table 5.4 is as follows.

The rear side of the frame 1 has an enlargement 43 and adj ustably connected thereto is a bracket 44 provided with a longitudinal channel guide. 45 for a slide head 46 on which is detachably mounted a cam plate 47. The upper face of the cam plate 47 has slow speed or work producing grooves 48 and 49 connected by a fast speed groove 50 and by reference to Fig. 1,. it will be noted that the grooves 48 and 49 are not exactly parallel with the side edges of the cam plate 47 but are disposed at a slight angle thereto and it is the angularity of the grooves 48 and 49 that produces a feeding movement for the sets of tools 41 and 42, whereby said tool will have a cutting action relative to the pin portions 24 of the crank shaft 25.

Extending into the groove 50 and adapted to enter the grooves 48 and 49 is aroller 51 on a stud 52, carried by a rearward extension 53 of the table 39, and when the cam plate is reciprocated the table 39 is moved transversely of the bed' plate 34 to move the sets of tools 41 and 42 into and out of operative relation to the crank shaft 25.

Adjustably connected to the slide head 46 is a pitman 54, and said pitman is pivot-ally connected. to the face of a large worm wheel 55 mounted on a shaft 56, 'journaled in the bracket 57 carried by the frame 1. Meshing with the worm wheel 55 is a worm 58 on a shaft 59 journaled .in a U-shaped pivoted bearing 60 pivotally connected, at 61, to a bracket 62, carried by the frame 1. The bearing 60 has one end thereof pivoted so that the worm shaft may be raised and lowered and thereby shift the worm 58 into and out of engagement with the worm wheel The pivoted end of the worm shaft 59 has change speed gears 63 and 64 meshing with similar gears 65 and 66, respectively, on a shaft 67, journaled in the bracket 62 and another bracket 68 supported by the frame 1, as best shown in Figs. 1 and 3. The shaft 67 is driven by an endless sprocket chain 69 from an extension 70 of the shaft 8 of the tail stock and the change speed gears 63 to 66 inclusive are proportioned for two speeds and the speed controlled by a conventional form of clutch 71 associated with a shaft 67. The change speed gears and 66 are loose on the shaft 67 and may be fixed relative to said shaft so as to impart movement to the worm shaft 59 by shifting the clutch into engagement with either of said gears, and this is accomplished by a transverse rock shaft 7 4, jonrnaled in bearings 72 carried by the front and rear walls of the frame 1. The rear end of the rock shaft 71 has a fork 73 engaging the clutch 7.1 and the front end of the rock shaft 74 has a slotted crank 75. The slotted crank 75 is articulated with a slide bar 76 in a bracket 77, carried by the front wall of the frame 1, and said slide bar has a roller 78 in proximity to the face of the timer wheel 79, which is mounted on a shaft 80 j'ournaled in the bracket 77.

The face of the timer wheel 79 is provided with inner and outer annular grooves 81 for sets of cams 82 and 83 which are adjustable in the grooves 81 and are adapted to be set to engage the roller 78 and slide bar 76, so as to reciprocate said slide bar in a desired direction. The set of earns 82 will shift the slide bar 7 6 in one direction and the set of cams 83 shift said slide bar in an opposite direction, and with said cams adjustable in the grooves 81 of the wheel 79 it is possible to position said cams so that one movement of the slide bar will be in timed relation to another movement thereof, all. of which depends on the speed of the timer wheel 79.

To impart movement to the timer wheel 7 9 the shaft 80 is provided with agear wheel 84 meshing with a gear wheel 85 on a transverse shaft 86 journaled in suitable bearings carried by the front and rear walls of the frame 1. The rear end of the shaft 86. has a gear Wheel 87 meshing with a gear wheel 88 on the shaft 56 and in consequence of this train of gears the timer wheel 79 may be driven indirectly from the worm shaft 59.

The timer wheel 79 is also employed for causing a cessation in the operation of the machine by permitting the worm 58 to drop by gravity out of engagement with the worm wheel 55, and this is accomplished by providing the timer wheel 7 9 with a radial projection 89 on its periphery to engage the upper end of a trip lever 90 supported by the front wall of the frame 1 and best shown in Fig 4. The trip lever 90 has its lower end notched to engage a double crank 91 on a transverse shaft 92, journaled in bearings 93 of the frame 1, said double crank having a handle 94 so that it may be manually manipulated to elevate the worm 58 for engagement with the worm wheel 55, so that the machine may be started.

On the rear end of the shaft 92 is a crank 95 having a slotted engagement with a pin 96 on the free end of the pivoted bearing 60, and when the shaft 92 is rocked the free end of the bearing 60 may be raised and lowered so as to move the worm 58 into and out of engagement with the worm wheel 55.

To prevent accidental shifting of the clutch operating mechanism, the clutch fork 73 has a depending lug 97 normally engaged by a pivoted spring held arm 98, as best shown in Fig. 2, said arm being held constantly in engagei'nent. with the lug 97 but capable of yielding when the clutch fork 7 3 is shifted by the rock shaft 74-.

In operation, I will assume that the worm 58 is in engagement with the worm wheel 55 and that the machine is started by applying power to the shaft 29. The herring bone gears 30 and 16 will revolve the crank shaft 25 or the piece of work in the holders 22 so that the pin portions 24 of the crank shaft will be turned about a common axis; Power is transmitted from the shaft 8 of the tail stock to the shaft 67, and according to the position of the table 39 relative to the cam plate 47, as shown in Fig. 1, the change speed gears 63 to 66 inclusive are in high speed, the set of tools 42 rapidly advancing towards the pin portions 24 of the crank shaft 25, and the set of tools 41 rapidly receding from the crank shaft. This comparatively rapid movement of the table 39 continues until the roller stud 52 reaches the groove 48 of the cam plate 47, when there is a change in speed brought about by the timer wheel 79. F or instance, one of the cams 82 impinges against the end of the slide bar 76 and the shaft 74 is rocked to shift the clutch 71 and change the speed of the shaft 59 so that the worm wheel 55 will be slowly revolved to shift the cam plate 47. A slight angle of the groove 48 is sufficient to feed the set of tools 42 while the peripheries of the pin portion 24 of the crank shaft 25 are ground to either rough or fine finish according to the nature of the sets of tools 41 and '42.

Immediately upon the operation being completed by a set of tools 42, one of the cams 83 of the timer wheel 79 actuates the slide bar 76, rock shaft 74 and changes the rotation of the worm shaft 59 from low speed to high speed so that the cam plate 47 will. be rapidly shifted and transfer the roller stud 52 from the outer end of the groove 48 through the groove 50 to the inner end of the groove 49. The time wheel v7'9 again comes into action. to produce a slow speed in connection with the worm shaft 59 and the set of tools 41 are slowly advanced while operating on the pin portions 24 of the crank shaft 25. After these two operations by the sets of tools 42 and 41 the timer wheel causes a cessation in the operation of the machine by the peripheral lug 89 of the .timer wheel 79 actuating the trip lever 90 which releases the transverse shaft 92 and permits the free end of the pivoted bearing 60 to drop by gravity and thereby move the worm 58 out of engagement with the worm wheel The tools ll and 42 are thus rendered inactive and the operator or ati tendant of the machine can shut off the power to the shaft 29, but it is obvious that suitable connections can be made with the power so that when the trip lever 90 is actuated, the power will be simultaneously i0 shut off with a'cessation in the movement of the sets of tools 41 and 42.

I attach considerable importance to the shafts 8 being adjustable in the gears 16, since after the-crank shaft is placed in the holders 22 the shafts 8 can be adjusted rela- 25 holder, a change speed mechanism controlling the movement of said tools, a timer wheel controlling the operation of said change speed mechanism, and a worm and gear interposed between said change speed mechanism and said tools and constructively arranged to be controlled by said timer wheel.

2. A machine of the type described comprising revoluble work holders, a power shaft disposed parallel to said work holders, means employed for adjusting and maintaining the work holders in alinement with each other and said power shaft in positive operative relation to said work holders, tools adapted '40 to he alternately shifted into and out of engagement with a piece of work in said holders, change speed mechanism controlling the movement of said tools, and a timer wheel controlling the operation of' said change speed mechanism.

3. A machine of the type described comprising revoluble work holders, tools adapted to be alternately shifted. into and outof engagement with a piece of work in said work holders, a cam adapted to move said tools, a worm and gear for imparting movement to said cam, and means adapted to to the front side of the machine and is automatically actuated.

5. A machine of the type described comprising revoluble work holders, a horizontally disposed cam plate adapted to shift tools into and out of operativerelation to a piece ,of work held by said work holders, variable speed operating means for said cam plate, a timer wheel operated through said variable speed operating means, and means actuated by said timer wheel to cause a cessation in the operation of said cam plate independent ofsaid variable speed operating means. l

6. A machine as characterized in claim 5, wherein the last mentioned means includes a trip lever that may be manually set to place said cam plate in operation.

7. A machine as characterized in claim 5, wherein means is interposed between said timer wheel and said variable speed operating means so that said timer wheel may cause changes of speed in said operating means.

v8. A machine of the type described comprising housings, shafts journaled in said housings and adapted for holding a piece of work, a power shaft,herringbone gears transmitting power from said power shaft to said shafts, and means interposed hetween said shafts and the herring bone gears thereof so that said shafts may be adjusted relative to said herring bone gears to properly aline a piece of work with said shafts.

. 9, A machine as characterized in claim 8, wherein said means includes spiders fixed on. said shafts and adapted for adjust-ably holding the gears of said shafts.

10. A. machine of the type described comprising longitudinally alining holders adapted for supporting a crank shaft, means for imparting rotation to said holders, and means interposed between said holders and tne first mentioned means so that said holders may be circumferentially ad usted relative to the first mentioned means.

In testimony whereof I aflix my signature iii the presence of two witnesses.

HANS BAER-BALCK.

shift said worm relative to its gear to cause lViti1esses: a cessation in the operation of said cam. KARL H. BUTLER, 55 4. A machine as characterized in claim 3, ANNA .M. Donn.

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