US2374726A - Device for dressing grinding wheels and the like - Google Patents

Description

May 1, 1945. J BLAZEK 2,374,726

DEVICE FOR DRESSING GRINDING WHEELS AND THE LIKE Filed May 22, 1943 2 Sheets-Sheet l INVENTOR. JOHN Y BLAZEK .ATTOR NEYS.

F16. 4 45 m $3 i -9 y 1945- .a. Y. BLAZEK 2,374,726

DEVICE FOR DRESSING GRINDING, WHEELS AND THE LIKE Filed May 22, 1943 2 Sheets-Sheet 2 9 I 2 FIGS 31%, Y B INVENTOR. 26 -5 don-IN LAZEK & B27 I Z 516.5 @W M ATTORNEYS Patented May 1, 19.45 I

DEVICEFOB DRESSING GRINDHVG WHEELS AND THE LIKE John Y. Bl'azelr, Redford, Ohio, assignor' to Lempoo: Products, 11102,

ration of Ohio .Bedford', Ohio, at corpo- Application May 22, 1943, Serial No. 488,020

7' Claims.

This invention relates, as indicated,.to devicesfor dressing grinding. wheels andthe like.

A. primary object of the. invention is to. pro vide. a device for dressing grinding wheels in which means are provided. for clamping the device to the work to be. ground, and for aligning the dressing tool. and grinding wheel with the work. to be ground.

Another object of the invention is to provide a device of the character described having a dressing tool holder mounted for movement enabling radii to be ground on a grinding wheel, and having means incorporated therein. for limiting the movement of the holder beyond predetermined positions during. such grinding.

A further object of. the invention is to provide a device of the, character described having novel means for clamping the dressing tool holder in a fixed position to. enable the face of a grinding wheel to bev dressed.

Other objects and advantages of the invention. will be apparent during the course of the following description.

In the accompanying drawings, forming a part of this specification, and in which like numerals" are employed to designate like parts throughout the same.

Fig; I is a view, partly in elevation, and partly in section, of a device embodying the invention; Fig. 2' is a fragmentary elevational" view of a portion of the device, as viewed in. the direction indicated by the line 2-2 of. Fig; 1;

Fig. 3 is. a cross-sectional view, taken on. the

line 3t-3'of Fig. 2';

4' isa fragmentary cross-sectional view, taken on the line 4'4" of Fig. l;

. Fig: 5 is a fragmentary cross-sectional view, taken on the. line 5.-5 of Fig, I;

which is' to be ground on a grinding'wheel, and

Fig. 9" is a side elevation of the gauge assembly;

Referring more particularly to the drawings, it will be: seen that the device comprises a supporting bar: I having secured to and extending laterally from the upper end. thereof a bracket 2, the. bracket being secured to the bar I' by means of socket head cap screws 31. v

The bracket 2' has a' bearing 4 disposed therein adjacent its outer end, this bearing being secured in position by means of a" socket head set screw 5 having a; dog point. v

The bearing 4 has a conical surface 6' which forms a; seat for the conical intermediate portion. 1 of a driving pin, theupper' portion 8 of" which extends through the bracket 2", and has securedthereto a crank handle 9', and the lower portion I0 of which is secured, as by" means of a taper pin l I, to a dressing. tool holder l2.

The supporting bar I has secured to andextending laterally from the lower end thereof, a bracket I3, this bracket being secured to-thebar I by means of socket head cap screws M1 The bracket I13 has threadedly secured therein, alignment with the driving pin I -B -IO, a slotted head set screw I5 having a dog point I'G which serves asathrust bearing for the lower end of the .tool holder 12, the point. It being seated in a seat el'ement' I'I', secured in' position by means of a socket'head set screw I 8 having" a dog point engaging this element. The set screw I5" may be adjusted to take up wearbetwee'n the pointy I6 thereof and the seat element I1, and is locked in adjusted position by means of a lock-nut IQ.

It will be noted that the brackets 2 and P3 are curved to conform with the curved ends of the tool holder I2, and'that the tool" holder" has secured therein. at a; point substantially midway of its ends; a diamondapointed' dressing tool 26', which may be adjusted axially'and locked in ad'- justed position by means of asocket' head set screw 2| having a cone point engaging. the tool.

For the purpose of locking the tool holder I2 to the bar I, as when grinding a fiat face on a grinding wheel, in a manner tobe presently described, a set screw 22' isfprovide'd, having a cone point 23 at one end, and a' knurled collar 24 secured to the head thereof, the" screw being threadedly mounted in the holder I2. When the holder I2 is to be locked to theiba'r I', the screw'2'1 is: rotated so as'to causethecone point 23 thereof to extend into a V-shaped recess. 25 inthe adjacent face of the bar I.

The "device further includes a; work gripping clamp 25' which is coplanar with. the bar I' and brackets 2 and I3, and whichmay be. vertically adjustedrelatively to thebar I. For this purpose, the clamp is recessed at its. edge 21 to fit a guide'way or tenon 28 which projects from. the bar II, this tenon thusserving ta maintain the clampifi coplanar with the bar allf adjusted positions. The clamp is secured to the. bard by means of socket head cap screws 29, the heads of which are disposed in recesses 30 in the bar I and the stems of which extend through slots 3| in the bar I and into the clamp 26. To adjust the clamp 26, all that is necessary-is to loosen the screws 29, move the clamp upwardly or downwardly, and then tighten these screws.

The clamp 26 is provided with a V-seat 32 for the work to be ground, and with a cooperating clamping element 33 which is threadedly secured to the clamp 26 and is provided with a handle 34 for manipulating the clamping element.

A small level 35, whose function will'be presently described, is mounted on the upper edge 36 of the clamp, and is secured to such edge by -means of clips 31.

The device further includes a scale 38 which is secured to one side of the bar I, and the purpose of which will also be presently described.

Having thus described the general constructional features of the device, the two principal uses thereof will now be described.

The first of these uses involves the dressing or truing of the peripheral face F, of a grinding Wheel GW, which, for example, is to be used to grind a crankshaft C, it being assumed that in the grinding machine on which the crankshaft is mounted to be ground, that the wheel GW is movable away from the crankshaft sufiiciently to permit the dressing device-.to be attached to the crankshaft in the manner shown in Fig. 1.

If the crankshaft is four inches in diameter, the clamp 26 is first adjusted so as to bring the index line 39 thereof in alignment with the 4 inch mark on the scale 38, after which the clamp is securely fastened to the bar I by means of the screws 29. The clamp 26 is then secured to the crankshaft, by causing the crankshaft to seat in K tire device being first adjusted, however, to insure that the level 35 indicates that bar I is vertical.

The holder I2 is then looked to the bar I in the manner hereinbefore described, so that the point of the dressing tool 20 is in horizontal aligmnent with the center of the crankshaft, as well as the center of the wheel GW.

With the parts thus positioned, the wheel GW is brought into engagement with the tool 20, and is moved axially by any suitable traversing means, so as to cause the tool 20 to grind or dress the peripheral face F of the wheel, as diagrammatically indicated in Fig. 6, it being understood that the grinding wheel is rotated at a suitable speed during this dressing operation. I

After the wheel has been properly dressed, the dressing device is removed, so as to permit the grinding wheel to be brought into operative grinding relation to the crankshaft C, which is to be ground.

The other use-of the device involves the grinding or dressing of a radius on the peripheral face of the grinding wheel.

For this purpose, the device is set up and adjusted as previously, but the radius to be ground is first determined by means of a locating gauge such as shown in Figs. 8 and 9, said gauge comprising a round bar 40 having a flattened surface M to which is secured a scale 42, along which a toollocating element 43 may be adjusted to any desired position, and locked in adjusted position by means of a set screw 44. The hardened end 45 of the bar 40 is first brought into engagement with a hardened steel insert 46 in the bar I2. The element 43 of the gauge is then set at a position on the scale which represents the radius to which the wheel is to be dressed, after which the dressing tool 20 is adjusted in the tool holder I2 so as to bring the' diamond point thereof into engagement with the face 41 of the element 43, so that the tool 20 is now set to produce the desired radius on the wheel.

The set screw 2! is then withdrawn from the recess 25 in the bar I, so as to permit the tool holder l2 to be rotated about its pivotal axis.

The grinding wheel GW is then brought into engagement with the diamond point 20, and the wheel is rotated as the holder I2 is rotated about its pivotal axis by means of the handle 9, so as to grind a radius Ran the face of the grinding wheel, as shown in Fig. 7.

In order to insure the diamond point from passing the diametral plane DD of the grinding wheel, when a radius is to be ground on only one side of this plane, the bracket 2 is provided with a thumb screw 48 at each side thereof, which thumb screw, when moved into the path of the holder I2, prevents the holder from moving beyond the plane in which it is shown in Fig. 1.

Movement of the holder in the opposite direction is limited by one of the stops 49, which dependfrom the bracket 2, and have flat surfaces 50 against which the holder I2 impinges to prevent the diamond point from biting into the grinding wheel, which would occur if the tool were permitted to move beyond the extremity of the radius which is to be ground.

After the radius has been ground, the device is removed, so as to permit the wheel to be brought into operative engagement with the work to be ground.

It is to be understood that the form of my invention, herewith shown and described, is to be taken as a preferred example of the same, and that various changes in the shape, size and arrangement of parts may be resorted to, without departing from the spirit of my invention, or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. In a device of the character described, a supporting bar, a clamp secured to said bar and adjustable therealong, said clamp adapted to be clamped to work to be ground, and a dressing tool holder pivotally mounted on said supporting bar.

2. In a device of the character described, a supporting bar, a clamp secured to said bar and adjustable therealong, said clamp adapted to be clamped to work to be ground, a dressing tool holder pivotally mounted on said supporting bar, and means on said clamp for indicating a level position of the clamp when clamped to said work.

3. In a deviceof the character described, a supporting bar, work clamping means secured to said bar and movable therealong, and a dressing tool holder pivotally mounted on said supporting bar.

4. In a device of the character described, a supporting bar, means secured to said bar and adapted to be clamped to work to be ground, said means being adjustable along said bar, and a dressing tool holder mounted on said bar.

5. In a device of the character described, a supporting bar, means independent of and secured to said bar and adaptedto be clamped to work to be ground, and a dressing tool holder pivotally mounted on said bar, said holder being independent of said bar.

6. In adevice of the character described, a supporting bar, work clamping means comprising determining the position of one bar relatively to the other for work of different diameters to be clamped by said work-clamping means;

7. A device, as defined in claim 6, in which said last-named means comprises a scale on one of said bars and an index line on the other, said scale and line cooperating to'indicate the position of the bars relatively to each other for work of difierent diameters to be clamped by said work- 10 clamping means.

JOHN Y. BLAZEK.

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