US1811933A - Mechanism for truing and dressing grinding wheels - Google Patents

Description

June 30, 1931. F. J. HOHNHORST ET AL 1 ,9

MECHANISM FOR TRUING AND DRESSING GRINDING WHEELS Filed June 20. 1929 6 Sheets-Sheet l June 30, 1931. i F.- J. HOHNHORST ET AL 1,811,933

A MECHANISM FOR TRUING AND DRESSING GRINDING WHEELS I Filed June 20. 1929 e Sheets-Sheet 2 June 1931- F. J. HOHNHORST ET AL 1 811,9 3

MECHANISM FOR TRUING AND DRESSING GRINDING WHEELS Filed June 20. 1929 6 Sheets-Sheet 3 lNl/E/VTORS June 30, 1931. F. J. HOHNHORST ET AL 1,311,933

MECHANISM FOR TRUING AND DRESSING GRINDING WHEELS Filed June 20, 1929 6 Sheets-Sheet 4 June 30, 1931. F.- J. HOHNHORST ET AL 1,311,933

MECHANISM FOR TiwINe AND nanssme GRINDING WHEELS Filed-June 20. 1929 s Sheets-Sheet 5 June 30, 1931. F. J. HOHNHORST ETAL 1,311,933

MECHANISM FOR TRUING AND DRESSING GRINDING WHEELS Filed June 20. 1929 6 Sheets-Sheet 6 Patented June 30, 1931 UNITED STATES FERDINAND J. HOHNHORST ANIJ FERDINAND J. KROEGER, F COVINGTON,

KENTUCKY MECHANISM FOR TRUING AND DRESSING GRINDING WHEELS Application filed June 20.

Our invention relates to mechanism for truing or dressing grinding wheels, such as emery wheels, employed in machinery for grinding or polishing the surfaces of metal in precision grinding, and is employable for truing or dressing the grinding wheel without removing the grinding wheel from the grinding or polishing machine, and without removing the work from between the centers in the grinding or polishing machine.

It is the object of our invention to provide novel means whereby to support the abrading part in inactive relation and to adjust the same into active relation with the grinding wheel; further, to provide novel means for mounting the abrading part on the tail-stock of the rinding machine; further, to provide novel means for adjusting the abrading part about the axis of the tail-spindle; and, further, to provide novel means for fixing the abrading part in adjusted positions and for permitting axial movements of the tail spindle.

The invention will be further readily understood from the following description and claims, and from the drawings in which latter:

Fig. 1 is a plan view of our improved device applied to an exemplified grinding machine, partly broken away.

2 is a cross-section of the same, taken on the line 22 of Fig. 1, and partly broken away.

Fig. 3 is a cross-section of a detail of the same, taken on the line 3-3 of Fig. 1, and partly broken away.

Fig. 4-. is a side elevation ofour improved device, the grinding machine being partly broken away and partly in section.

Fig. 5 is a plan view of the same.

Fig. 6 is a sectional detail of one of the clamping means, taken on the line 6-6 of Fig. 5.

Fig. 7 is a sectional detail of another of the clamp means, taken on the line 77 of Fig. 4.

Fig. 8 is an axial section of our improved device, taken on the irregular line 88 of Fig. 4.

Fig. 9 is a side elevation of a modification 1929. Serial No. 372,416.

of our improved device, the grinding machine being partly broken away.

Fig. 10 is an axial section of thesame. taken in the plane of the irregularline 10-10. of Fig. 9.

ig. 11 is a cross-sectional detail view, taken in the plane of the line 11-11 of Fig. 10.

Fig. 1:2 is a side elevation of a second modification of our improved device, with the, grinding machine partly broken away.

Fig. 13 is an axial section of the same, taken in the plane of the line 1313 of Fig. 12. V I

Fig. l lis a sectional detail view of the same, taken in the plane of the line 14-14 of Fig. 13.

Fig. 15 is a cross-sectional detail view of the same, taken in the plane of the line 1515 of Fig. 13. r i

F ig. 16 is a side elevation of a third modification of the same, the grinding machine being partly broken away; and,

Fig. 17 is an axial section of the taken on the line 17-17 of Fig. 16.

In grinding machines, as usually constructed, axial movement takes place between the work and the grinding wheel, either by lengthwise feeding of the work-supporting table or by axial feeding of the support for the grinding wheel. We have exemplified a machine in which the axial feed is caused by lengthwise movement of the work-supporting table.

Our invention is particularly applicable in connection with machines in which it is desired to grind or polish long cylindrical ob} jects, for instance, shafts of different diameters, and in which it is desired to dress the grinding wheel without removing the grinding wheel .or the work from the grinding ma chine. Our improved device is further applicable in such relations where it is desired to dress the grinding wheel at each complete reciprocation between the work and the grind ing wheel.

For accomplishing these objects weprovide a frame on which the abrading part is same,

supported, this abrading part being eX- emplified as an abrading wheel. Ne furce grinding ther so mount the supporting frame so that the abrading part may be positioned out of the range of movement of the grinding wheel or adjusted into contact with the grinding wheel, and we have further pivotally mounted the supporting frame for the abrading part about the axis of the tail-spindle of the machine in such manner that axial adjustments of the tail-spindle are permitted; and, further, so that rigid positioning of the supporting frame may be had.

In the present exempliflcation the grinding machine comprises a frame 11, on which there is a slide 12, adjustable in suitable manner upon the frame. This slide is provided with bearings 13 in which a shaft 14 is journaled, a grinding wheel 15 being suitably releasably secured to the shaft. The grinding wheel is rotated, for instance, by means of a suitable belt passing about a pulley 16 on the shaft 1 1. The grinding wheel is instanced as rotating in the direction of the arrow a.

The grinding wheel may for instance be an emery wheel of suitable construction. The grinding surface of the grinding wheel becomes impregnated with particles of the material being ground and other substances. It becomes dull and loses its grinding efl'ect, requiring that the grinding surface be redressed or resharpened, which in the present instance is accomplished by an abrading part, shown as an abrading wheel 17 The abrading wheel is instanced as a normally quiescent abrading wheel, arranged to be rotated in the direction of the arrow 1) by contact with the rotating grinding wheel.

A saddle 21 is slidable on guideways 22, 23, on the frame, and is feedable by means of a rack 24, with which a pinion 25, suitably driven in reverse directions, meshes, for providing suitable endwise feed in reverse directions between the work, exemplified at 26 and the abrading part 17, on the one hand, and the grinding wheel 15, on the other hand, although this endwise feed may be obtained by endwise movement of the grinding wheel with relation to the work and the abrading part, as explained for instance in Patent No. 1,544,985, granted us July 7, 1925, for improvement in mechanism for truing and dressing grinding wheels.

A work-supporting table 31 is pivoted by a pivot 32 on the saddle 21. This work-supporting table has thereon the usual headstock 33 supporting the usual head-center 34:, and the usual tail-stock 35 supporting the usual tail-center 36, the work 26, exemplified as a shaft of large diameter, being supported in usual manner between said centers. The head-center is in the usual quill 37 in a bearing 38 of the head-stock. The quill may be rotated in usual manner, as by means of a usual pulley 39 fixed to the quill.

Usual means are provided for causing the work to rotate with the head-center and with the quill. The head-stock is arranged to be positioned in usual manner on the table, being slidable laterally on guideways 40, 41, on the table, and suitably clamped in adjusted positions.

The tail-center 36 is mounted in usual manner in a usual tail-spindle 15, adjustable axially in a barrel 16 of the tail-stock, as by means of a screw 17, which is held endwise in a bearing 48 of the tail-stock and has a hand-wheel 19 thereon for rotating the same. The tail-spindle is prevented from rotating by being provided with a spline-groove 50, in which a key 51 in the bearing 16 is received. A clamp-shoe 52 is slidable in a guideway 53 in the tail-stock. A screw 54 is threaded in a threaded hole 55 in the tailstock and has a handle 56 thereon, which bears upon the shoe, and by means of which the screw is rocked in opposite directions for respectively clamping and unclamping the tail-spindle in the tail-stock.

The tail-stock is adjustable laterally on the guideways 4:0, 11, of the table, and is clamped in suitable manner in adjusted positions to the table.

Referring to Figs. 1 to 8 inclusive, a frame 61 is provided with a bearing 62, received about the tail-spindle. The bearing is on an annular flange 60, which extends from the barrel 46 of the tail-spindle. The frame also has a bearing 63, in which an axle 6 1 is secured. A shell 65 is received about the axle. Ball- bearings 66, 67 are located between the axle and the shell and are held endwise to the axle. The abrading wheel 17 is secured to the shell, as between a flange 68 on the shell at one side of the abrading wheel, and a collar 69 about the shell and a nut 7 0 threaded about the threaded end of the shell at the other side of the abrading wheel. The abrading wheel is thus rotatively mounted upon the frame 61. This frame may be termed a quadrant frame. A shield 59 is provided on the frame for the abrading wheel.

The abrading part may be of other form and other mountings may be employed within the spirit of my invention, as contained in the accompanying claims.

Clamping means 76 are provided between the pivoted frame and the tail-stock. These are shown comprising a stud 77 having a threaded end 78 threaded into a threaded hole 79 in the tail-stock. This stud has a flange 80, forming a shoulder, for coaction with the inner end face of the tail-stock. The threaded portion 81 of the stud is received through an arcuate slot 82 in the pivoted frame 61. This arcuate slot is formed about the bearing 62, and is preferably on an are which has the axis of this hearing as its center. The flange 80 has flattened portions 75.

The arcuate portion 83 of the pivoted frame is located between a nut 84 on the threaded portion 81 of the stud at one side of the pivoted frame, and a washer 85 and a nut 86 about said threaded portion 81 at the other side of the frame. The nut 8 1 is provided with a set-screw 8? for clamping the nut to the stud. This nut 84 is preferably placed in such position on the stud that the arcuate portion of the plate 61 is supported thereby when the bearing 62 is on the flange 60 and the outer end of said bearing is supported by the inner end of the barrel 16 of the tail-spindle.

The nut 86 is arranged to clamp the pivoted plate to the tail-stock in the various positions of the pivoted plate.

A handle 88 is on the pivoted plate, by means of which the pivoted plate is manipulated for rocking the same about the tailspindle and posltioning-the abrading part either in inactiverelation, away from the path of the grinding wheel, or in proper abrading relation with the grinding wheel for performing the abrading operation.

A releasable clamp 91 is provided for clamping the pivoted frame about the flange 60. This is shown as comprising a clampshoe 92, movable in a guideway 93 in the pivoted frame. A bolt 94 has threaded con nection 95 at the inner end of said guideway, for fixing the bolt to the pivoted frame. A spring 96 is received in the guideway between the. end wall 97 of said guideway and the shoe, for normally pressing the shoe outwardly away from the tail-spindle.

A nut 98 threaded about the bolt coacts withthe shoe for forcing the shoe inwardly against the flange 60, and thereby clamping the pivoted frame about the tail-spindle, or for relieving inward pressure on the shoe, so that the shoe may be pressed outwardly by the spring 96, for releasing its clamping pressure upon the flange, in order that axial movement of the tail-spindle may take place. Release relation of the shoe also permits pivotal movement of the frame to take place upon release of the clamping means 76.

In employing our improved device, the pivoted frame 61 may be adjusted into such position that the abrading wheel 17 is out of range of the path of the grinding-wheel 15. The abrading wheel is shown arranged to make contact with the grinding-wheel be low the horizontal plane in which the axis of the grinding-wheel is located. The abrading wheel is therefore adjusted downwardly and outwardly to be out of range of the grinding-wheel. The pivoted frame is clamped in such inactive relation by the clamping means 76. The releasable clamp 91 of the tail-spindle may in such position be in release relation.

When it is desired to place the abrading wheel in active relation, the clamping means 76 are released, whereupon the pivoted frame is rotated about the tail-spindle, for placing the periphery of the abrading wheel into contact position with the periphery of the grinding Wheel, the clamping means 76 being thereupon clamped, and the releasable clamp 91 being also preferably clamped about the tail-spindle, so as to provide a rigid support for the abrading wheel while in operative position, thereby preventing chattering or unequal rotation of the abrading wheel during the abrading operation.

The clamp 91 may be maintained in such a frictional engagement about the flange 60 as to permit rotation of the pivoted frame 61 upon release of the clamp 76, the clamp 91 being maintained sufficiently tight to insure steady operation of the abrading wheel.

The abrading Wheel may, if desired, re-

main in such active relation during the grinding operation, for contact-between the abrading wheel and the grinding-Wheel at the end of each complete reciprocation of the work,

for maintaining the grinding-wheel in dressed relation. If desired, however, the abrading wheel may be placed in such active position only during intervals of dressing action upon the grinding wheel, obtained by short reciprocations of the abrading Wheel in contact with the grinding-wheel beyond one end of the work. Either of these uses of the abrading wheel may, however, take place without disturbing the work and the grinding adjustment between the grinding-wheel and the work. 1

If it is desired to adjust the tail-spindle endwise, this may be accomplished without disturbing the position of the abrading wheel.

The bearing 62 is preferably provided with anannular flange 99, inwardly of the inner ion end of the flange 60. The inner periphery of this flange rides upon the inner portion of the tail-spindle, and forms a dust-arresting cap for the tail-spindle.

-A modification of our improved device is shown in Figs. 9, 10 and 11, in which similar parts are designated by similar reference numerals raised to the series 100.

In this modification, the pivoted frame 161 is provided with a bearing 162 about the an nular flange. which extends from the barrel 146 of the tail-stock. In some grinding machines this flange 160 is rather short, and the present modification is accommodated to such conditions.

To form a releasable clamp 191, the bearing 162 is shown as a clamp-bearing being provided with a split 192. A bolt 194 is received through a hole in the cheek 193 of the hearing at one side of the split and is threaded in a threadedhole 195 in the cheek 196 of the bearing at the other side of the split. .By rotating" the bolt the split-bearing 162 is either clamped upon the flange 160, or un ing means 176, 191.

The clamping means 191 may be normally maintained sufliciently tight to permit rotation of the pivoted frame 161 and insure steadiness of operation.

In this modification a dust-cap 197 is fixed to the end of the tail-spindle 145 by means of screws 198. This dust-cap is provided with a flange 199 slidable endwise in the bore 200 of the pivoted or quadrant frame. This dust-cap is arranged to arrest the dust and dirt i1 cident to the grinding operation and to protect the tail-spindle and its bearing therefrom. The limited endwise movement of the tail-spindle required in a grinding machine is permitted while the dust-cap or a portion thereof remains in said bore.

A further modification of our invention is exemplified in Figs. 12, 13, 14:, and 15, similar parts being designated by similar numerals raised to the series 200.

In this modification, the pivoted frame 261 is pivoted on a bushing 25? of a bushing-plate 258. -.his bushing-plate is provided with a clamping means 201, comprising a clamp bearing 202 provided with a split 203. A bolt 204i is rotatable in a hole in the cheek 205 of the bearing 202 at one side of the split and is threaded in a threaded hole 206 in the cheek 207 of the bearing at the other side of the split, for clamping the bushing-plate to the annular flange on the barrel 2&6 of the tail-stock, or for releasing said bushing-plate from said flange.

In'this modification, the bushing-plate is provided with the quadrant-slot 282, and the pivoted frame 261 is provided with a hole 211 in registry with said slot, a belt 212 being receiv d through said slot and said hole. A nut 213 is arranged to clamp the pivoted frame and the bushing-plate together. Clamping means 27 6 are thus exemplified.

The pivoted frame is also clamped to the bushing by a releasable clamp 291. This clamp is in the form of a bearing 262 received about the bushing and provided with a split 292. A bolt 29s is rotatable in a hole 111 the cheek 293 at one side of the slit, and is threaded in a threaded hole 295 in the cheek 296 at the other side of said split. Rotation of the bolt clamps the split-bearing 262 upon the bushing, or releases the pivoted frame therefrom, so as to permit rotation of the pivoted frame about the bushing, by manipulation of the handle 28S upon release of the clamping means 276, 291, for positioning the abrading part into contact or out of contact with the grinding wheel. The clamping means 201 or 291 may be normally maintained suflioiently tight to permit rotation but insure steadiness of operation.

A still further modification is shown in Figs. 16 and 17, for adapting our improved device to grinding machines in which an extremely short dust-cap flange 360 is present. In this modification, the clamping means 391 are transferred from clamping upon the flange, to clamping upon the tail-spindle direct. In this form clamping means 37 6 and 391 are provided which are the same as the clamping means 7 6 and 91 exemplified in Figs. 4; to 8 inclusive. The parts in this modification which are similar to the parts previously described are designated by similar reference numerals raised to the series 300.

lVhen employing this modification, the clamping means 391 is unclamped when axial adjustment of the tail-spindle is to be made. The bearing 362, however, remains in position about the tail-spindle during axial movement of the tail-spindle, and the abrading wheel is held in fixed relation'to the tailstock during such axial movement of the tailspindle by the clamped relation of the releasable clamp 37 6. After such adjustment of the tail-spindle, the clamp 391 is again clamped upon the tail-spindle, insuring rigidity of all the parts.

If it is desired to make angular adjustment of the abrading tool, the clamping means 376, 391, are released, the pivoted frame 361 is adjusted, and the clamping means 3'76, 391, again clamped.

In this modification the pivoted frame is provided with an annular flange 315 received about the flange 360, the structure forming a dust-cap for the tail-spindle.

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

1. In a machine of the character described. the combination with the grinding wheel, the tail-stock and the tail-spindle, of a pivoted frame comprising a pivot-bearing arranged to be received pivotwise about said tail-spindle, an abrading part on said pivoted frame arranged for coaction with said grinding wheel, and releasable arcuate clamping means between said tail-stock and said pivoted frame comprising a clamp-stud and an arcuate slot for said clamp-stud, permitting adjustments of said pivoted frame about said tail-spindle for positional relations between said abrading part and said grinding wheel and arranged for clamping said pivoted frame in adjusted positions about said tail-spindle.

2. In a machine of the character described, the combination with the grinding wheel, the tail-stock and the tail-spindle, of a pivoted frame comprising a pivot-bearing arranged to be received pivotwise about said tail-spindle, an abrading part on said pivoted frame arranged for coaotion with said grinding wheel, a clamp-stud arranged for attachment to said tail-stock, said pivoted frame provided with an arcuate slot for said clampstud permitting adustments of said pivoted frame about said tail-spindle for positional relations between said abrading part and said grinding wheel, and arranged for clampfob its

ing said pivoted frame in adjusted positions about said tail-spindle, and a releasable clamp about said tail-spindle permitting axial adjustments of said tail-spindle in said pivotbearing.

3. In a machine of the character described, the combination with the rotary grinding wheel, the tail-stock and the tail-spindle, of a pivoted frame comprising a pivot-bearing about said tail-spindle, a clamp'for said pivotbearing for clamping said pivoted frame about said t-ail-spindle, an abrading part on said pivoted frame, a clamp-stud on said tailstock, said pivoted frame provided with an arcuate slot in which said clamp-stud is located, clamping means for said clamp-stud for clamping said pivoted frame in adjusted positions about said tail-spindle, and a handle on said pivoted frame wherewith to move said pivoted frame about said tail-spindle.

4. In a machine of the character described, the combination with the rotary grinding wheel, the tail-stock and the tail-spindle, of a pivoted frame comprising a pivot-bearing about said tail-spindle, a bearing on said pivoted frame, an abrading wheel supported by said last-named bearing, a clamp-stud extending from said tail-stock, said pivoted frame having an arcuate slot about said tailspindle in which said clamp-stud is located, and clamping means for said clamp-stud, said pivoted frame adjustable about said tailspindle for positional relation of said abrading wheel with said grinding wheel, and said clamping means arranged for clamping said pivoted frame in adjusted positions.

5. In a machine of the character described, the combination with the rotary grinding wheel, the tail-stock and the tail-spindle, of a pivoted frame comprising a pivot-bearing about said tail-spindle, a bearing on said pivoted frame, an abrading wheel supported by said last-named bearing, a clamp-stud eX- tending from said tail-stock, said pivoted frame having an arcuate slot about said tailspindle, said clamp-stud located in said arcu ate slot, clamping means for said clamp-stud,

said pivoted frame adjustable about said tailspindle for positional relation of said abrad- 1ng wheel with said grinding wheel, said clamping means arranged for clamping said pivoted frame in adjusted positions, and a releasable clamp on said pivoted frame for sand pivot-bearing, said releasable clamp acting to clamp toward said tail-spindle, and arranged so that said pivoted frame is held axially to said tail-stock and said tail-spindle is axially adjustable in said pivot-bearing.

6. In a machine of the character described, the combination with thegrinding wheel, the tail-stock and tail-spindle, said tail-stock provided with an inwardly extending annular flange about said tail-spindle, a pivoted frame about said annular flange, an abrading part on said pivoted frame arranged to coact With said grinding wheel, radial clamping means on said pivoted frame about said tallspindle, and arcuate clamping means between said pivoted frame and said tall-stock.

In testimony whereof, we have hereunto signed our names.

FERDINAND J. HOHNHORST. FERDINAND J. KROEGER.

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