US1411181A - Machine for regrinding automobile crank shafts - Google Patents

Description

F. H. PETERSEN AND .I. H. DARLING. MACHINE FOR REGRINDING AUTOMOBILE CRANK SHAFTS.

APPLICATION FILED MAY 2. 192].

1,41 1, 181 Patented Mar. 28, 1922.

2 SHEEIS' SHEET 1-7 Patented Mar. 28, 1922.

2 SHEETSSHEET 2.

& m

fizz'enions F. H. PETERSEN AND 1. Hi DARLING.

MACHINE FOR REGRINDING AUTOMOBILE CRANK SHAFTS,

APPLICATION FILED MAY Z, 1921.

UNITED STATES PATENT OFFICE.

FRANK H. PETERSEN AND JAMES H. DARLING, OF DENVER, COLORADO, ASSIGNORS OF TWO THIRDS TO ALFRED S. WESTON, OF DENVER, COLORADO, AND ONE-THIRD TO SAID PETERSEN.

MACHINE FOR REGRINDING- AUTOMOBILE CRANK SHAFTS.

To all whom it may concern."

Be it known that we, FRANK H. PETER- SEN and JAMES H. DARLING, citizens of the United States of America, residin at the city and county of Denver and tate of Colorado, have invented a new and useful Machine for Regrinding'Automobile Crank Shafts, of which the following is a specification.

Our invention relates to improvements in machines for re-grinding automobile crank shafts.

The object of the invention is to provide a machine comprising a power operated cutting or grinding rotary tool, and a support therefor which is mounted in a pivoted slideway on the compound of a lathe carriage so as to have a reciprocating movement therein, one end of the support being adapted to surround and to be secured upon either the crank pins of a crank shaft or upon the bearin -supported portions of said shaft, to proper y position the grinder with respect to the pin or shaft portion being ground, the support remaining stationary when the shaft is ground and having a reciprocating movement when a crank pin is being ground.

This object is accomplished by the mechanism illustrated in the accompanying drawing, in which:

Figure 1 1s a side vlew showing the manner of operatively supporting the machine.

and-connecting it to a crank shaft which is centered in a lathe.

Figure 2 is a plan view of F i ure 1.

Figure 3 is aplan view of t e machine on a much larger scale.

Figure 4 is a side view of the same.

Figure 5 is a vertical sectional view on the line 5-5 of F igure4. I

Figure 6 is a sectional view on the line 66 of Figure 4.

Figure 7 is a' sectional view on the line 7-7 of Figure 4.

Figure 8 is a face view of a style of rotary grinder used in connection with the machine.

Figure 9 is a sectional view of Figure 8.

' Specification of Letters Patent. Patented Mar, 28 1922.

Application filed May 2, 1921.

Serial No. 465,965.

Figure 11 is a perspective view of a rotary cutter or millin tool, which may be used instead of the grinding tool, and,

Figure 12 is a sectional view through the, micrometer.

Referring to the accompanying draw- 1ngs:

The numeral 1, indicates the carriage of a common form of engine lathe, and 2, the usual compound which is adjustably mounted on the carriage and has a movement at right angles to that of the carriage. .The compound has a T-slot 3, in wh ch is mounted an ordinary slotted tool post 4, and to the upper face of the compound is clamped a bearing block 5, having a lateral, bifurcated base 6, which straddles the tool post 4, and is provided on its under side with a rib or tongue 7, which lies in the T-slot 3, and prevents a twisting moverectangular in form, and is provided with I a longitudinal slideway 12, which extends in from the face of the block a distance equal to about half its thickness, and the opposing faces of the slideway are slightly inclined towards each other,-so that the width of the slideway increases slightly from the face of the block, inward. Back of the slideway the block is formed with a central recess 13, the back wall ofwhich has an axial hole which extends out through the hub 10. A shaft 14, is mounted in the hub 10, the inner end of which carries a bevel gear wheel 15, which lies in the recess 13, of the block, and the outer end of this shaft carries a sheave wheel 16, which is connected with a power source in a manner to be presently described. A slide bar 17, is mounted in the slideway 12, its parallel edges being beveled or inclined to correspond to the inclined faces of the slideway, and a shim 18, is interposed between the upper edge of the slide bar and the adjacent face of the slideway, and is held against the slide bar by screws 19, as shown.

parts.

. gitudinal slipping movement.

The shim is adjusted to take up wear between the bar and slideway, thus maintaining a proper sliding fit between the This slide bar is provided with a longitudinal slot 20, which extends to within a short distance of each end of the bar, and on one end of the bar is formed a semicircular extension 21, to the free endof which is hinged a substantially semicircular arm 22, the free end of which is bifurcated and normall rests on the adjacent end portion 23, o the slide bar, this portion of the bar being narrower than the remainder of the bar, as shown in Figure 4. .A stud 24, is screwed into the upper edge of this narrow portion 23, and extends through the bifurcated end of the arm 22, when the latter is closed, and a thumb nut 25, is screwed upon the stud and against the bifurcated end of the arm 22, thereb holding the arm in closed position. A rib 26, is formed on the under side ofthe free end of the arm 22, which fits in a groove or recess 27, in the adjoining edge of the bar and holds the arm securely against a lon- The parts 22 and 23, together form a ring-like head A, through which the crank pins or the axial portions of a crank shaft extend when undergoing regrinding, and each of the parts 22, and 23, is formed with a laterally projecting lug 28, in each of which is formed an axial hole 29, which also extends through the parts 22, and 23, respectively; the parts of the holes extending through the lugs being threaded, while the remainder of each hole is unthreaded. Into the unthreaded parts of the holes 29, are inserted the shanks of V-shaped clamps 30, which lie within the head A, and thumb screws 31, are screwed into the lugs and against the ends of the shanks of the clamps 30, to clamp them upon the crank pin or the axial portion, as the case may be, of a crank shaft,

as will hereinafter more fully appear. A raised portion 32, is formed on the guide block 11, on one side of the recess 13 and this raised portion has a semicircular bearing, in which rests the hub 33, of a bevel pinion 34, which meshes with the bevel gear 15, the pinion being held in place by a cap 35, which is fastened to the raised part 32, by screws as shown in Figures 4 and 6.

The end ofthe pinion hub 33, is flanged, as shown at 36, to prevent endwise movement of the pinion in its bearings. A shaft 37, extends longitudinally through the slide bar and beyond each end of the same, this shaft passing axially through the pinion 34, and its hub. The shaft is formed with a longitudinal groove 38, and the wall of I the bore of the pinion hub is provided with a spline 39, which fits in the groove 38, thereby turning the shaft 37, with the pmadjacent end portion of the shaft 37. The

end portion of the shaft extending beyond the bearing 42, is threaded, and either a grinding or a cutting wheel may be screwed thereon. If a grinding wheel is employed, it may be a flat faced emery wheel 43, having a nut 44, embedded in its rear face which is screwed upon the end of the shaft; or it may be a similar wheel 45, one-half of the face of which is beveled or inclined, as shown at 46, so as to be out of engagement with the surface being ground, thus presenting a semicircular grinding face, by which the frictional resistance between the wheel and the surface being ground is greatly reduced. If a cutting or milling wheel is desired, a common type of wheel'47, such as shown in Figure 11, may be employed. The opposite end portion of the shaft 37, passes through a common form of micrometer gauge M, comprising a tubular member 48, which is screwed into the adjacent end of the slide bar, the shaft passing through the same; an elongated hollow nut 49, which is threaded to the member 48; a flanged bushing 50, which surrounds the shaft and extends through the end wall of the nut, and a member 51, which is screwed upon the projecting portion of the bushing, a screw 52, being passed through the part 51, and the bushing 50, and into one of a series of notches 53, on the shaft, thereby rigidly securing the parts 50 and '51, to the shaft. Anti-friction ,balls are interposed between the flange of the bushing and the adjacent face of the end wall of the nut; between the outer end of the nut and the member 51, and between the bushing and the margin of the hole in the end of the nut, through which the said bushing passes. By turning the nut 49, on the part 48, the shaft 37, can be moved forward to cause the grindingwwheel to engage a crank pin or an axial portion, the part 48, and the nut 49, being formed with cooperating graduation marks, which indicate the minutest adjustment of the shaft. The nut is held against accidental rotation by a spring 54, which is secured at one end to the part 48, its free end bearingfrictionally on the nut.

The crank shaft to be reground is supported in the usual chuck and tail stocks 5 and 5 of the lathe, and on the true center line of its axial portions, and the head A to be inserted in the head, and the arm 22,

' is then swung back and clamped in place by the nut 25. The said pin is then clamped between the V-shaped clamps 30, so that the axis of the pin may-be 'in line with the axis of the shaft 37, or slightly above or below the axis of the shaft 37 as conditions may warrant, and this position of the pin with respect to head A, and the axis of the shaft 37, is maintained by 'the clamps 30, throughoutthe regrinding of the pin.

The bevel gear 15, may be operated by belting the sheave wheel 16, to a wheel ona power shaft, apart from and above the lathe but we preferably support both the grinding machine and its driving belts and pulleys together. with the operating motor, directly upon the lathe, and in the following manner:

Upon the rear side of the carriage 1, are bolted a pair of standards 55, which are curved slightly towards the front side of the carriage. In the up er ends of these standards is mounted a s aft 56, upon which is mounted a horizontally disposed bar 57 upon one end of which is secured-an electric motor X, adapted to be connected with a current source, in the usual manner. The opposite end of this bar carries a stub shaft 58, upon which are mounted a pair of sheave pulleys 59 and 60. The pulley 59, is connected by a belt 61, with a sheave pulley 62, rigidly mounted on the shaft 56, and which is preferably of greater diameter than the pulley 59; and the pulley 60, is connected by a belt 63, with the sheave wheel 16. The shaft 56, also has a sheave pulley 64, which is connected by a belt 65, with a sheave pulley 66, on the motor shaft, and power is thus transmitted from the motor to the hotel gear wheel 15, through the belts and pulleys above described. The relative diameters of the pulleys 62 and-59, and of the pulleys 60 and 16, may be such as to give the required speed to the shaft 37, for the purpose intended. The weight of the motor, on one end of the bar 57, is sufiicient to hold the belt 63 under the necessary tension, and when the said belt is removed from the wheel 16, the motor will tilt the bar 57, until it rests upon a cross bar 55, which is secured to the standards 55, thus supporting the weight of the 'motor.

In operation, the crank shaft is supported in the lathe, and the head end of the slide bar 17 is secured, say, upon one of the crank pins, in the manner before described. The grinder is then adjusted by the micrometer to engage the pin, and the motor is started. The crank shaft is turned upon its axis at a relatively slow speed, and the slide bar is thereby slid back and forth in the guide block 11, a distance corresponding to the throw of the crank, and at the same time the guide block is rocked in its bearing in the block 5. The gear wheel 15, imparts a very rapid rotation to the bevel pinion 34, which in turn imparts its rotation to-the grinding shaft 37, by means of the spline 39, which slides in the groove 38, of the shaft 37, as the slide bar reciprocates in the block 11, through its connection with the crank pin to which it is connected by the V-clamps 30. The grinder is fed against the crank pin by the micrometer, until the necessary amount of the surface of the pin has been removed, to correct any irregularity or unevenness therein, and as the crank shaft turns on its true axial center, and the axis of the guide bar maintains the same position relatively to the axis of the pin throughout the grinding operation, it will be seen that when reground the surface of the pin will not only be level throughout, but concentric, round and true with its axis, the lathe carriage bein adjusted to move the grinder over the w ole length of the pin.

The operation for regrinding or cutting the shaft is the same as in regrinding or cutting the crank pins, only that when the shaft portions are reground or cut, the slide bar remains stationaryin the slide block 11, which in turn remains stationary in its bearing block 5.

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

1. In a machine for regrinding crank shafts, the combination with means for-supporting and turning a crank shaft on its axis, of a bar capable of a reciprocating movement having a ring-like head on one end adapted to loosely surround a crank pin of said shaft and means for connecting said head to said pin to revolve therewith, an adjustable rotatable grinding element on said' bar for engaging said in, and power driven means for rotating said grinding element.

2. In a machine of the character described, the combination with means for supporting and turning a crank shaft on its axis, of a bar capable of a reciprocating movement,

means operated thereby for transmitting rotation to said grinding means. v 3. In a machine ofthe character described, the combination with means for supporting and turning a crank shaft on its axis, of a pivoted support, a bar slidably mounted therein having a ring-like head on one end adapted to loosely surround a crank pin of said shaft, and clamping elements in said head to secure the same to the crank pin to revolve therewith, a grinding element carried by said bar to engage said pin, means for adjusting said grinding element, and power driven means carried by the -pivoted support for operating the grinding element.

4. In a machine of the character described, the combination with means for supporting and turning a crank shaft on its axis, of a pivoted support, a bar slidably mounted in said support having a ring-like head on one end adapted to loosely surround a crank pin of said shaft, and means for securin said head to said pin to revolve therewit an adjustable shaft mounted in said bar having a grinding element thereon for engaging said pin, a pinion wheel on said pivoted support through which said shaft extends slidably but not rotatably, and a power-driven gear wheel also mounted in said pivoted support in mesh with said pinion.

5. In a machine of the character described, the combination with means for supporting and turninga crank shaft on its axis, of a pivoted support, a bar slidably mounted therein having a member adapted to surround a crank in of said shaft and clamps in said member for securing the same to the crank pin to revolve therewith, a bevel pinion mounted on said pivoted support, a longitudinally adjustable shaft hav ing a longitudinal groove, mounted in said slidable bar and extending slidably through said pinion, a spline in said pinion which enters said groove, and a power-driven bevel gear also mounted in said pivoted support, which meshes with said bevel pinion.

6. In a machine of the character described, the combina'tion with means for supporting and turning a crank shaft on its axis, of a pivoted support, a bar slidably mounted therein, a grinding element mounted in said bar and power-driven gearing mounted on said pivoted support for rotating said grinding elerrfent,'a ring-like head on one end of said slide bar, having a hinged section which is opened to permit said head to receive a crank pin of said crank shaft, means for locking said hinged section in closed position, adjustable clamps in said head for engaging said crank pin and maintaining a fixed relation between said head and said crank pin during the revolutions of said pin, and means for moving said grind in element into contact with said pin. a

In a machine of the character described, the combination with means for supporting and turning a crank shaft on its axis, of a support, a guide block pivoted to said support, a power-driven bevel gear axially mounted in said guide block, a bevel pinion mounted on said guide block in mesh with said gear having-an apertured hub and a spline therein; a longitudinally slotted tudinal groove to receive said spline where I by said shaft is rotated by said pinion, a

grinding element on the forward end of said shaft, a ring-head on the forward end of the slide bar, having a hinged section which is opened to permit the insertion of a crank pin in said head, means for locking the section in closed position, adjustable means in said head for engaging said crank pin whereby said head is revolved with said pin, and means for adjusting said shaft longitudinally to cause said grinding element to engage said pin, said pinion extending into the slot in said slide bar.

8. In a machine of the character described, the combination with means for supporting and turning a crank shaft on its axis, and an adjustable member having a movement at right angles to the axis of the shaft, of a support on said adjustable member, a guide block in pivoted engagement with the support, a bar slidably mounted in said guide block and adapted to be secured at one end upon a pin of said crank shaft to turn therewith, a rotatable grinder mount ed in said bar, means for adjusting the same with respect to the crank pin, and powerdriven gearing supported in said guide blockfor rotating said grinder.

9. The combination of means for supporting and turning a crank shaft on its axis, a support, a guide block pivotally mounted in the support, a longitudinally slotted bar slidably mounted in the guide block, a shaft axially mounted in said guide block, having a gear wheel on one end and a belt wheel on the other end, a pinion 'mounted on said block in mesh with said gear, a shaft extending slidably but non-rotatably through said pinion, and mounted in the ends of said slide bar, a grinding wheel on the forward end of said shaft, an integral ring head on the forward end of the slide bar adapted to surround a pin of said crank shaft and means in said head for holding the same upon said pin to turn with the same, a micrometer gauge connected to said shaft and to said slide bar, for adjusting said shaft to cause said-grinding wheel to engage said crank pin, anda power-driven belt for engaging said belt wheel, said pin-' ion extending into the slot in said slide bar.

10. The combination with a lathe for sup porting and turning a crank shaft on its axis, a carriage on said lathe and an adjustable member on the carriage having a movement thereon at right angles to that of the carriage, of a bearing block rigidly secured to the latter member, a guide b ock having a hub pivotally mounted in the bearing block, a shaft mounted in said hub having a pulley on one end and a bevel gear on the other, standards on the carriage and a shaft mounted in the upper endsof the standards, a bar pivotally mounted on the shaft having a motor on one end and a pulley on the other end and a belt connecting the same with the first mentioned pulley; belts and pulleys for transmitting the rotative power of the motor to the pulley on the end of the arm, a longitudinally slotted bar slidably mounted in the guide block, a bevel pinion on the guide block in mesh with the bevel gear, and extending into the slot in the slide bar, a rod mounted in said slide bar, and extending slidably through said bevel pinion, but adapted to rotate the same, a grinder on the forward end of the shaft, means for connecting the forward end of the slide bar. to

" a crank pin of said crank shaft to turn therewith, and means for adjusting said rod to cause said grinder to engage the crank pin. 11. In a machine of the character described,

the combination with means for supporting said head, and means for normally clampand turning a crank shaft, of means adapted to be connected at one end to a crank pin of said shaft, and having a rotary grinder, means for adjusting said rotary grinder with respect to the crank pin, means for supporting the grinder, carrying means to permit a reciprocating movement of the same and means for rotatin said grinder.

12. In a machine of t e character described, a longitudinally slotted bar, a pivotally mounted guide block in which said bar is slidabl mounted, a ring-like head on one end 0 said bar having a hinged section which can be swung back to leave an .opening in the ringhead and means for holding said section in a closed position, a bevel pinion mounted on said guide block and ex tending, into the slot in the slide bar, a grooved shaft extending slidably through said bevel pinion and mounted in the ends of said bar and a spline in said pinion for engaging the groove in said shaft, a flat faced grlnder-on the end of said shaft with in said ring head, an abutment on the other end portion of said shaft, a tubular member on the adjacent end of said slide bar, surrounding said shaft, a nut threaded to said tubular member and connected to said abutment for imparting longitudinal adjust ment to said shaft, a bevel gear mounted in said guide block in mesh with said pinion, and means whereby said gear wheel may be rotated in combination with means.

for supporting and turninga crank shaft on its axis, V-clamps in said head for engaging a crank pin, and thumb screws for holding said clamps in engagement withsaid pin, whereby said slide bar moves with said pin and properly positions the grinder with respect to the pin, a fixed relation being maintained between the axis of said shaft and the axis of the crank pin.

, 13. In a machine of the character described, a bar capable of a reciprocating movement, a longitudinally adjustable shaft in said bar, a grinder on the forward end of said shaft and means for imparting rotation to said shaft, a ring-like head on the forward end of said bar having a hinged section which can be thrown back to open ing the free end of said section'against the adjacent end portion of said bar, and adjustable clamps in said head whereby said head may be clamped upon the pin of a crank shaft axially mounted in operative relation to said slide bar, to properly position said grinder with respect to said pin.

' 14. In a machine of the character described, the combination with longitudinally slotted slide bar and a shaft extending through said slot and through the end portions of said bar and having a grinder thereon, of a bearing in the forward end of said bar, comprising an internally and externallfy threaded sleeve, and a. bushing for said sha t which is threaded to said sleeve.

In testimony whereof we afiix'our signa tures in presence of two witnesses.

FRANK H. PETERSEN. JAMES H DARLING.

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