US2101794A - Grinding wheel positioning mechanism - Google Patents

Description

Dec. 7, 1937. c G FLYGARE. 2,101,794

GRINDING WHEEL POSITIONING MECHANISM Filed Aug. 15, 1935 2 Sheets-Sheet 1 7 nnnnunununuunuunnm Dec. 7, 1937. I I Q FLYGARE 2,101,794

GRINDING WHEEL POSITIONING MECHANISM Filed Aug. 15, 1935 2 Sheets-Sheet 2 I I CHRL. GFLYGFIRE fi I ust Patented Dec. .7, 1931 {PATENT OFFICE Carl G. Flygare, assignor to Norton company, Worcester, Maaa, a corporation of Massachusetts Application August is, 1935, Serial No. mass 4 Claims.

This invention relatesto grinding machines, and more particularly to a grinding wheel positioning mechanism.

One of the objects of this invention is to provide a simple and thoroughly practical grinding wheel positioning mechanism.

It is another object of this invention to provide a wheel spindle positioning mechanism which is compact in form and simple in construction and serves to enable the grinding wheel to be moved axially.

Another object of this invention is to provide a wheel spindle positioning mechanism which is' manually controlled to permit the grinding wheel to bereadily positioned up against a shoulder to grind the end face of the shoulder. I

Another object of this invention is to provide a wheel spindle positioning mechanism which is manually controlled and which serves to locate and hold the spindle in a predetermined adjusted position relative to the work.

Another object of this invention is to provide a wheel spindle positioning mechanism which is controlled by a manually operable lever to readily position the grinding wheel to split the spark a in a crankshaft grinding operation.

Other objects will be in part obvious or in part pointed out hereinafter.

This invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings in which is shown one of various possible embodiments of the mechanical features of this invention,

Fig. l is a vertical sectional view taken through a grinding wheel slide showing the wheel spindle, bearings, and positioning mechanism;

Fig. 2 is a fragmentary sectional view, on an enlarged scale, of the wheel spindle positionin mechanism;

Fig. 3 is a cross sectional view taken approximately on the line 3-3 of Fig. 1;

Fig. 4 is a fragmentary elevation, on an enlarged scale, of the lever control and stop device for the wheel spindle positioning mechanism;

Fig. 5 is a fragmentary plan view to show the applicability of this invention to a crank grinding operation;

Fig. 6 is a fragmentary plan view showing the application of this invention to a shoulder grinding operation, such as grinding the shoulder of a roll;

Fig. 7 is a vertical sectional view taken approximately on the line 1-1 of Fig. 2; and

a Fig. 8 is a fragmentary plan view of the connection between the screw and yoke.

The embodiment of the invention selected for illustration comprises a grinding machine having a base ill which supports a transversely movable wheel slide ii on a flat way i2 and a V-way ii. The wheel slide II is arranged to be moved transversely on the flat way l2 and V-way i3 by means of a feeding mechanism including a half nut 15 which depends from the under side of the wheel slide II. The half nut i5 engages a cross feed screw l6 which may be rotated by any wellknown feeding mechanism, such as for example that shown in the expired patent to Norton No. 762,838 dated June 14, 1904. v

The wheel slide II is provided with bearings 20 and M which serve to rotatably support a grinding wheel spindle 22. A grinding wheel 23 is mounted at one end of the spindle 22, and a driving pulley 24 is mounted at the opposite end thereof. The driving pulley 24 may be driven by a belt from any suitable source of power, such as an overhead belt drive (not shown) or a motor on the wheel slide (not shown).

To obtain the main object of this invention, it is desirable to provide a simplified means of grinding a shoulder on a work piece and also to split the spark or equalize the side grinding by opposite sides of the grinding wheel 23 in a crankshaft grinding operation. This is preferably accomplished by providing a grinding wheel spindle which is capable of an axial or longitudinal movement within its bearings and providing a wheel .spindle positioning mechanism by which the wheel spindle may be readily moved axially within its bearings to position the wheel in the desired operative relation with the work piece being ground. Such a mechanism is preferably manually operated and arranged so that the grinding wheel may be readily and accurately positioned against a shoulder or thegrinding wheel may be moved to split the spark and equalize the side grinding of the wheel in grinding the checks of a crankpin in a crankshaft grinding operation.

In the embodiment of the invention illustrated in the drawings, the wheel spindle is provided' with a rotatable collar which is rotatably mounted on the spindle 22 against a shoulder on the spindle 36 by means of a thrust collar 31. A yoked member 38 is pivotally mounted on a stud 39 inthe wheel slide Hand is connected with the collar 35 by means of screws 40 and II which are screw threaded into the yoked member 38. The screws 40 and 4| are provided with cylindrical end portions 42 and 43 which engage holes 44 and 45 in the collar 35. It will be readily apparent that when the yoked member 38 is rocked on itspivot 39, the pins 42 and 43 through collar 35 will transmit an endwise axial positioning movement of the spindle 22 In order that the endwise positioning movement of the wheel spindle may be readily controlled and the spindle may be moved to a predeof two parts which are arranged to support the transversely movable bushing 48. An'end cap 5| is held on the open end of the head 48 by means of screws 52. The end cap is provided 'with a longitudinally extending way 53 whichmates with correspondingly shaped groove 54 in the bushing 48. The bushing 48 is arranged to slide transversely within the head 48 as the yoke 38 is oscillated.

The screw 58 is screw threaded into a rotatable nut 55 which is supported in a bearing 56. The bearing 56 is held inva depending projection 51 of a cover plate 58 on the upper surface of the wheel slide The depending projection 51 is provided with a cylindrical bore 58 of a. size to support the bearing 56. The depending portion 51 is slotted at itsvlower extremity and is provided I with a pair of transversely extending clamping screws 68 and 6| which serve to lock or clamp the bearing 56 in a position within the depending portion 51. The nut 55 is provided with a reduced threaded portion 65 which serves to support a thrust collar 66. The other end of the nut 55 is provided with an integrally formed bevel gear 61. The rearface 68 of the gear 61 serves as an end thrust member to bear against the end of the bearing 56. The thrust collar 66 is held in adjusted position bymeans of the lock nuts 18 and 1|. The pitch of the screw threads 58 and the nut 55 are such that when the bevel gear 61 is rotated, the screw will be moved endwise to position and holdthe grinding wheel in a predetermined position relative to the work. This movement is transmitted through the stud 41 to 'cause a rocking movement of the arm 46 which serves to rock the yoked member 38 about its pivot stud 38. This movement of the yoked member 38 transmits a corresponding movement through the screws 48 and 4| to move the collar 35 and transmit an endwise positioning movement to the wheel spindle 22 and the grinding wheel 23. Y

In order to readily rotate the nut 55, a manually operable control device is provided on the upper portion of the wheel slide. A rotatable shaft 18 is mounted in a vertically extending boss 1| on the plate 58. The lower end of the shaft 18 is provided with a bevel gear 12 which meshes with bevel gear 61. The bevel gear 12 is locked on a reduced portion 13 of the shaft 18 by means of a washer 14 and a nut 15 which is threaded on a reduced threaded portion I6 of the shaft 18. The shaft 18 is provided with an integral flange 88 and integral reduced portion 8|. A plate 82 is mounted on the portion 8| of the shaft 18 and is held in a fixed position relative to flange 88 by means of screws 83.

A control lever 85 is. connected to a yoked member 86 which straddles a block 81 and is pivotally connected thereto by means of a stud 88. The

block 81 is provided with an aperture 88 which rotatably fits the portion 8| of the shaft 18. The block 81 is held on the portion 8| of the shaft 18 by means of a collar 88 and a nut 8| which is threaded on a reduced threaded portion 82 of the shaft 18; The block 81 is freely rotatable on the portion 8| of the shaft 18 and its lower ourface rests on the upper surface of plate 82. The nut 8| is adjusted to hold the collar 88 in the desired position to support and hold the block 81 against vertical or endwise movement.

The yoked portion 86 of the lever 85 is provided with a pawl I88 which is held in a fixed position thereon by means of a nut |8| and is arranged to engage any one of a series of notches I82 in the .plate 82. When the pawl I88 is in engagement with any one of the notches I 82 in plate 82, movement of the lever 85 serves to transmit a rotary motion to the shaft 18 and through bevel gears 12 and 61 causes a rotation of the nut 88 and an endwise movement of the screw 58 to rock the yoked member 3 8 and thereby cause an endwisepositioning movement of the wheel spindle '22 and the griming wheel 23.

The lever 85 has been shown in Fig. 1 in a position at 90 to its normal position for the sake of clarity of illustration. The normal positionof the lever 85 is at substantially right angles to the spindle 22 so that the lever 85 projects toward the front of the machine within easy reach of the operator.

The lever 85 may be swung through a considerable distance to cause a positioning movement of the wheel 23. Due to the reduction gearing and the pitch of the screw 58, a great reduction is obtained between the lever 85 and the spindle 22, so that the wheel 23 may be moved and positioned precisely in a predetermined position relative to the work piece being ground. If a greater movementof the wheel spindle is desired than can be obtained by the normal movement of the lever 85, the lever 85 maybe moved to its extreme position in either direction and the lever 85 then rocked about the pivot 88 to disengage the pawl |88 from the notch I82 and the lever 85, so that the yoked member 86 and the block 81 may then be rotated on the portion 8| of shaft 18 relative to the notched plate 82 until the-pawl 88 is aligned with the next notch I82 on the plate 82 and the lever 85 is then swung downwardly about its pivot 88 so that the pawl I88 engages the next notch I82. This positioningof the lever 85 relative to the plate 82 may be continued to the desired extent to cause the wheel spindle 22 and the grinding wheel 23 to move into the desired position relative to the work.

The periphery of the index or notched plate 82 may be provided with a graduated scale in order that the operator may readily observe the extent of movement of the wheel, if desired. An index finger or pointer I85 is fixedly mounted on the hub 1| and extends upwardly into alignment with the graduations on the plate 82.

It is desirable to provide a suitable friction de vice which may be adjusted to retard the rotation of the shaft 18. This is preferably accomplished by means of a friction ring or brake I86 which is preferably formed in two halves having a central aperture I81 arranged to fit and engage the periphery of the flange 88 on the shaft 18.

The two halves of the friction ring or brake I86 are connected together by means of bolts I88 and I88. Each of the bolts I88 and I88 is provided with a tension device comprising a spring In order to limit the extent of positioning movement of the grinding wheel 23, it is desirable to provide a suitable stop device which prevents axial positioning movement of the grinding wheel 23 beyond the desired distance. This is preferably accomplished by providing a stop lug 5 on the friction or brake ring I08. The stop lug H5 is arranged in the path of a similar stop lug H6 formed as an integral part of the hub ll. When the stop lug I I5 engages the lug H6, a further movement of the lever 85 can only be chtained against the friction of the brake ring I06, thereby giving the operator a warning that the wheel should not be moved further in an axial direction.

In the operation of the wheel spindle positioning mechanism, the operator rotatably mounts a cylindrical work piece, such as a roll 26 or a crankshaft 30, on the work supporting table (not shown) and by means 0! the usual tablepositioning mechanism positions the work in an approximate position relative to the grinding wheel. The grinding wheel is then fed transversely into operative engagement with the portion of the work to be ground by rotation of the screw l6 through the usual feed mechanism (not shown). The lever 85 is then moved to cause the wheel spindle 22 to move axially so as to position the side face of the wheel 23 in the desired relation with the shoulder 21, or the check 32 and 33 of the crankpin 3i which is to be ground.

In grinding a crankpln or a main bearing of a crankshaft, the crankshaft is rotatably mounted in operative position on the work table and the work table is then moved longitudinally to position the crankshaft in the approximate operative position relative to the grinding wheel. The wheel is then fed transversely toward the pin orbearing to be ground. When the wheel comes into approximate engagement with the cheeks of the pin or hearing, the lever 85 is swung in either directionto cause an endwise positioning movement of the wheel 23 to split the spark or equalize the side grinding on opposite cheeks of the pin or bearing to be ground.

It will thus be seen that there has been provided by this invention a wheel spindle positioning mechanism in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved.

As various possible embodiments may be made or the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that alLmatter hereinbefore set forth, or shown in the accompanying drawings, is to be interpreted as illustrative and bearings,a nut and screw mechanism to move said yoked member, and means including a manually operable lever to actuate said nut and screw to positively slide the wheel spindle in either direction within its bearings so as to position the grinding wheel into a predetermined position relative to the work piece and to positively hold it in said adjusted position during grinding.

2. In a grinding machine, a transversely movable wheel slide, spindle bearings on said slide, a rotatable wheel spindle supported in said bearings and arranged for a longitudinal axial positioning movement relative thereto, a rotatable grinding wheel on said spindle, an endthrust member carried by said spindle, a yoked member pivotally mounted on said slide and operatively connected to said thrust member to move the spindle within its bearings, a screw arranged to move said yoked member, a rotatable nut associated with said screw and arranged to move the screw endwise, and means including a manually operable lever to rotate said nut so as to positively move the spindle in either direction within its bearings to position the grinding wheel into a predetermined position relative to the work piece, said parts being so arrangedthat the grinding wheel may be manually positioned in a predetermined position relative to the work piece and positively held in said predetermined position during grinding.

3. In a grinding machine, a transversely movable wheel slide,. spindle bearings on said slide,

a rotatable wheel spindle supported in said bearings and arranged for a longitudinal axial positioning movement relative thereto, a rotatable grinding wheel on said spindle, an end thrust member carried by said spindle, a yoked member pivotally mounted on said slide and operatively connected to said thrust member to move the spindle within its bearings, a screw arranged to move said yoked member, a rotatable nut associated with said screw and arranged to move the screw endwise, a reduction gear mechanism op eratively connected to rotate said nut, and means including a manually operable lever to rotate said gearing so as to move the spindle within its bearings to position the grinding wheel into a predetermined position relative to the work piece. said parts being so arranged that the grinding wheel may be manually positioned in a predetermined position relative to the work piece and positively held in said predetermined position during grinding.

4. In a grinding machine, a transversely movable wheel slide, spindle bearings carried by said slide, a rotatable wheel spindle in said bearings and arranged for a longitudinal axial positioning movement relative thereto, a rotatable grinding wheel carried by said spindle, a thrust member carried by the spindle, a yoked member pivotally connected to said slide and operatively connected to move said spindle longitudinally, a screw bperatlvely connected to move said yoked member, a rotatable nut operatively connected to move said screw endwise, a reduction gear mechanism, a manually operable pivotally mounted lever arranged to turn said gear to move said spindle to position the grinding wheel in a predetermined position relative to the work piece and to hold it in adjusted position during grinding, and means including a pawl and notched wheel interposed between said lever and gearing to adjust the position of said spindle relative to said lever.

CARL G. FLYGARE;

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