US2056168A

US2056168A - Edge grinding machine

Info

Publication number: US2056168A
Application number: US729280A
Authority: US
Inventors: Joseph P Crowley
Original assignee: Libbey Owens Ford Glass Co
Current assignee: Libbey Owens Ford Glass Co
Priority date: 1934-06-06
Filing date: 1934-06-06
Publication date: 1936-10-06
Anticipated expiration: 1953-10-06

Description

Oct. 6, 1936. J. P. CROWLEY 2,055,168

EDGE GRINDING MACHINE 'E l 4: I s'wmtor @/oaE/DH P Pon/LEY Gttorneg Oct. 6, 1936. J. P. CROWLEY 2,056,168 EDGE GRINDING MACHINE v Filed June 6, 1934 4 Sheets-Sheet 2 lll 111llll/11111111111111111111 maentor q.IL-" ILl t:- JEI.. Bg

Gtt'orneg Oct. 6, 1936. J. P. CROWLEY EDGE GRINDING MACHINE Filed June 6, 1934 4 Sheets-Sheet 3 C. NQ N 45S v W1 Gttorneg @CL 6, 1936.. p* CRQWLEY @USGA-68 EDGE GRINDING MACHINE Filed June 6, 1934 4 Sheets-Sheet 4 Srwentor c/osL-PH P CROWLEY ttorneg Patented Get. 6, 1936 Nitro stares rAreN'r orgies 2,056,168 EDGE GRINDING MACHINE Application June 6, .1934, Serial No. 729,280 20 Claims. (Cl. 5,1- 96) The present invention relates broadly to improvements in grinding machines Vgenerally and more particularlyV to a machine for rounding and/or nishing the edges of sheets or Yplates of glass andthe like. i y

An important object of this invention resides in the provision of a grinding machine of simplifled and inexpensive construction primarily designed forA use in 'grinding the curved edges of sheets or plates of glass which are to be employed as door or window lights in automotive vehicles, although itis of course in no way restricted to such use.

Another object of the invention is the `provision of such a grinding machine of the above character which will round and nish the curved edges of the glass sheets vor plates rapidly, accurately, and economically, and with a minimum effort and attention on the part of the operator whereby uniformly rounded edgeswith well nished surfaces may be secured.

Another object of the invention is the provision of such a grinding machine of the above character capable of 'grinding curved edges 'of .dii-ferent contours readily and conveniently and'also so constructed that curved edges of diierent lengths may be ground with facility and accuracy.`

A further object of the invention is the provision of such a grinding machine of the above character' embodying a rotary grinding-wheel, means mounted above said wheel for supporting a plurality of glass sheets to be ground, and means for rocking said supporting means to move the glass sheets backward and forward with the curved edges thereof lto be ground over and in 'engagement with the vgrinding wheel, together with means for Vcontrolling and regulating the degree of rocking movement of the sheet-supporting means, depending upon thc-,length of arc or edge contour to be ground.`

A still further object of the invention is the provision of such a grinding machine oi theabove character wherein the sheet supporting meansr is mounted above the grinding wheel in such a manner that it is capable of free vertical oating movement during the rocking thereof and depending upon the curvature of the edges being ground, means being also providedV for varying the pressure of the glass sheets upon the said grinding wheel. 1

vStill another object of the invention is the provision of such a grinding machine of the above character embodying novel means for supporting the glass sheets above the grinding wheel and which includes means engaging thev edges of the sheets to be ground to assist in properly positioning the said sheets preparatory to grinding, together with means for moving the said lastmentioned means away from the sheet edges to permit the grinding thereof upon rocking movement of the sheet supporting means in one direction, said edge engaging means being subsequently automatically returned to sheet engaging position upon rocking of the sheet supporting means in the opposite direction.

Other objects and advantages of the invention vwill become more apparent during the course of the following description when taken in connec tion with the accompanying drawings.

In the drawings wherein like numerals are employed to designate like parts throughout the same,

Fig. 1 is a side elevation of a grinding machine constructed inaccordance with the present invention,

Fig. 2 is a vertical section therethrough taken substantially on line 2 2 of Fig. 1,

Fig. 3 is a perspective View of the upper pormeans for supporting the glass sheets,

Fig. 4 is a detail plan view of a portion of the -means for supporting the glass sheets,

Fig. 5 is a detail plan View of another portion of the sheet supporting means,

Fig. 6 is a transverse section taken substantially on line 6--6 of Fig. 2, f

Fig. 7' is a detail elevation of the'control switch,

Fig; 8 is a section taken substantially on line V8---8 of YFig.- 1,

Fig. 9 is a section taken substantially on line -Q of Fig. 1, and

Figs. 10, 11, and 12 are side views of the upper portion of the machine showing different positions assumed bythe sheet supporting means and glass sheets during the grinding operation. The grinding machine herein provided is adapted toproduce what is termed in the art as a pencil edge upon the glass sheets. The term pencil edge is used to designate an edge which is rounded transversely of the sheet to remove all sharp or square corners.

Referring now to the drawings and particularly toFig, 2,'the grinding machine includes a base l5 which is adapted to support the rotary grinding wheel l and the motor Il for driving the same, said motor being-mounted upon the top of Vsaid base and the grinding wheel being arranged to' one side thereof.

.tion of the machine showing particularly the The grinding wheel I6 is keyed to one end of 55 a horizontal shaft I8 and is provided in its periphery with a plurality of grooves I8 within which the edges of the glass sheets or plates to be ground are adapted to be received, as will be more clearly hereinafter apparent. The shaft I8 is rotatably supported in the spaced bearings 20 and 2l carried by the base I5, said shaft projecting rearwardly beyond said base and journaled at its outer end in a bearing 22 carried by a gear case 23 suitably secured to the base I5. Keyed to the shaft I8 within gear case 23 is a relatively large gear 24 meshing with a relatively smaller gear 25 fixed to the shaft 26 of motor I1, said shaft being preferably journaled in a bearing 21 also carried by gear case 23. Upon operation of the motor I1, it will be readily apparent that the shaft I8 will be driven through the

intermeshing gears

24 and 25 to effect the positive rotation of the grinding Wheel.

Arranged at the front of the base I5 is a receptacle 28 within which the grinding wheel I6 is received, said receptacle being adapted to contain a suitable abrasive material within which the lower portion of the said wheel is adapted to be immersed in a manner well known in the art. The top of the receptacle 28 is provided With a slot 29 through which the upper portion of the grinding wheel projects. The receptacle is also preferably provided with a door 30 to permit access thereto and with a drain outlet 3l at one corner thereof. Y

The base I5 is slidably associated with the receptacle 28 so that it can be moved vertically relative thereto to either raise or lower the grinding wheel. To this end, the rear vertical wall 32 of the receptacle is formed with a vertical undercut channel or way 33 (Fig. 6) within which the slide 34 formed on or carried by the base I5 is received. The rear wall of said receptacle is also provided with a vertical slot 35 through which projects the annular portion 36 of therbase I5 within which bearing 20 is mounted.

The base I5 is supported upon a screw 31 threaded at its lower end within a vertical cylinder or sleeve 38 carried upon the base portion 39 of the receptacle 28. The base I5 is formed with a recess 40 and keyed to the upper end of screw 31 within said recess is a relatively large gear 4I meshing with a relatively smaller gear 42 keyed to the lower end of a vertical shaft 43 which passes downwardly through the said base. Extending transversely through the upper end of the shaft 43 is a rod 44, constituting a handle which may be grasped by the operator to facilitate the turning of shaft 43. From the above, it will be seen that when it is desired to either raise or lower the base I5 and consequently the grinding wheel I6, it is simply necessary for the operator to grasp the handle 44 and turn the shaft 43 in the desired direction. The rotation of gear 42 will serve to effect a, corresponding rotation of gear 4I and upon rotation of gear 4|, the screw 31 will be threaded downwardly or upwardly within the sleeve 38 to effect either the raising or lowering of the base and grinding wheel.

The means for supporting the glass sheets to be treated comprises a box or holder designated in its entirety by the numeral 45, said holder being mounted above the grinding wheel I6 for free vertical and rocking movement as will be more fully hereinafter described. The work holder 45 Vcomprises a pair of spaced vertical side members 46 and 41 between which a plurality of glass sheets 48 to be ground are adapted to be received,

said sheets being disposed in a vertical position and the said side members being of such a size and so shaped that the curved edges 49 of the glass sheets to be treated project therebeyond as clearly illustrated in Figs. 1 and 10 to 12, so that upon rocking of the work holder, the said edges will be moved backward and forward over and in engagement with the grinding wheel I6.

Arranged transversely between and carried by the side members 46 and 41 of work holder 45, adjacent the upper ends thereof, are the three horizontally disposed

rollers

58, 5I and 52, while positioned transversely between the said side members adjacent the lower ends thereof are the rollers 53 and 54, said rollers being adapted to receive the glass sheets 48 to be ground therebetween and to maintain them in proper position during the grinding operation as will be more fully hereinafter described.

The roller comprises, as best shown in Fig. 8, a horizontal bolt 55 having its inner end extending through a vertically disposed arcuate slot 56 formed in the side member 46 and being secured in fixed position by a nut 51 threaded thereupon outwardly of the said side member. The opposite end of the bolt 55 is provided with a head 58. Mounted upon said bolt is a metal bushing 59 carrying a sleeve 60 preferably made of relatively soft rubber. This sleeve is formed with a plurality of uniformly spaced annular flanges 6I which define therebetween a plurality of grooves 62 within which the adjacent edges of the glass sheets 48 are adapted to be received.

The roller 5I is preferably of the same construction and arrangement as roller 5D with the exception that the supporting bolt 63 thereof projects at its opposite ends through spaced vertical slots 64 and 65 in the side members 46 Aand 41 respectively and has secured to each end thereof outwardly of the adjacent side member a nut 66. Upon tightening of the nuts 66, the roller can be firmly secured in place. The roller 52 is preferably of the same construction as roller 5 I with the supporting bolt 61 thereof projecting at opposite ends through the aligned

vertical slots

68 and 69 in the side members 46 and 41 respectively of the work holder and having threaded upon each end thereof a nut 18. Due to the particular manner of mounting the rollers50, 5I and 52 as above described, it will be readily apparent that the said rollers may be adjusted independently of one another toward and away from rollers 53 and 54 to accommodate glass sheets of different sizes and shapes.

The rollers 53 and 54 are likewise of substantially the same construction as

rollers

50, 5I, and 52, with the exception that they are not adjustably mounted, the supporting bolts 1I and 12 respectively thereof simply passing through circular openings in the side members 46 and 41 of the work holder and having threaded upon opposite ends thereof nuts- 13 and 14. The grooves 62 in roller 50, as well as the corresponding grooves in rollers 5I, 52, 53, and 54 are all in registry with the grooves I9 in grinding wheel I6.

Also positioned between and carried by the side members 46 and 41 of the work holder, adjacent the lower end thereof, is a substantially horizontal rectangular plate member 15 (Fig. 5) secured in place by a plurality of fastening elements 16. This plate member is disposed in substantial alignment with the rollers 53 and 54 and includes a relatively soft rubber pad 11 having a series (TIO rollers 53 and -54 and -being adapted Ato receive the adjacent -edges 'of the glass 'sheets 48 therein. The plate member 15 also serves lto hold the lower-ends of the side members of theworkho'lder in properly spaced relation. To iassi'st in lmaintaining the upper end portion's'of the side members lproperly spacedf-romone another, there may be provided a 1bolt 19 (Fig. 3) .passing through the said side members Vand having a nut threaded upon each end thereof, a sleeve 8| len'- circling the bolt between the 'side :members Vand acting to properly space the same.

It will be noted upon reference toFigs. 1 `and -10 to -12 that when the glass sheets 48 are eproperly positioned within the work holder, the curved Yedges-49 thereof to -be ground-extend considerably beyond the side members thereof. In A'order to assist Ain vsteadying the sheets during grinding, there may be provided an additional roller k82 adapted to rest upon the upper edges ofthe rglass sheets and being also provided with a ,plurality of grooves within which the edges 'of the Asaid sheets are received. As here-shown, the roller is rotatably carried at its 'opposite-ends by Aarms 83 and -84 mounted at their inner ends upon the supporting bolt 61 of the roller 52.

Suitably ysecured to the outer surfaces of the side members 46 and 41 of .the work holder are the-angular plates 85 and-86 respectively, to which `are pivotally connected the inner ends of 'a pair -of substantially horizontal, parallel supporting arms 81 and 88 respectively, said arms being als'o freely mounted intermediate their ends upon a horizontal shaft 89 passing transversely through a block 90 supported upon Vthe top of "the re'- ceptacle 28. The outer ends of the supporting arms 81 and 88 are bent inwardly` as at 81' and 88' respectively, and suspended therefrom are a plurality of weights 9|, 'said weights being hung upon an eye-bolt 92 attached at its upper end to the supporting arms by a transverse pin or the like 93. The weights 9| are provided to counterbalance the work holder -45 'so that the glass sheets being ground rest more or less freely upon the grinding wheel. However, by varying the weights, the pressure 'of the glass sheets upon the grinding wheel may be increased or decreased as desired.

Fixed upon the shaft 89 lat one end thereof, inwardly of supporting arm 81, is a bell crank lever 94 comprising the two angularly disposed portions or

legs

95 and 96. kPivot-ed -to the outer end of leg 95 of the bell crank lever -is one end 'of a substantially horizontal con-necting rod 91 pivotally connected at its inner 'end to the plate 85 adjacent the lower end thereof beneath su'ppor'ting arm 81. Keyed to the opposite end "of shaft 89, inwardly of sup-porting arrn 88, is `a lever 98, and pivotally connected thereto'is one end of a substantially horizontal connecting 'rod '9.9 extending parallel with rod 91 and being pivotally connected at its inner end to the plate 86 beneath supporting arm 88.

Each of the supporting 'arms 81 and 88 is pivotally-mounted at its inner end upon a horizontal pin |00 carried by the respective side member 46 or 41, while each of the connecting rods `91 and 99 is pivotally mounted at its inner end upon a horizontal pin |0I. The opposed pins |00 are in horizontal alignment withv one another and constitute the horizontal axis about which the work holder 45 is adapted tor rock. The opposed pins |01 are alsorin horizontal alignment with 'one 1another.

crank lever 94 is the upper end 'of a substantially vertical pitman |02 pivotally connected 'at its lower end to a 'crank |03 keyed to va horizontal 'Shaft |04, said shaft being driven from a motor |05 through a `suitable chain Vand sprocket drive |06 and reduction gearing located in the housing |01. Upon rotation rof the shaft |04, the pitman |02 will be given va substantially vertical upward and `doWn'Wa-rd motion 'to `effect the turning of the horizontal shaft 89 r'st in one direction and -then the other to impart a substantially horizontal forward and backward motion to the connecting

rods

91 and 99, it being of course 'understood that these rods work in unison. The re cipro'cation of the connecting rods will cause the 'work holder 45 to be rocked upon the pins |00, thereby 4causing the glass sheets 48 ltobe moved backward and forward with the curved edges A49 thereof to 'be ground over and in engagement with the grinding wheel. The pitman |02 preferably consists of a pair of aligned rods `|||8and |89 screw threaded at their inner adjacent ends and connected together by 'a turn-buckle ||0.

In the operation of the machine described vabove and when it -is desired to grind the curved edges 4'9 of va plurality of sheets of glass 48, the work holder 45 is rst moved to the position illustrated in Figs. l and 10, at which time the pitman |02 is at substantially the extreme liinit of its upward movement while the connecting

rods

91 and 99 are in retracted position. The `glass sheets to be ground are then inserted horizontally into the outer open end of the work holder-between the upper rollers 50, 5|, 52,'and 82 and the lower rollers 53 and 54, the upper edges a of the said sheets being received Within the grooves in the said rollers '58, 5|, 52, and 82, while the bottom edges b thereof are received within the grooves in rollers 53 and 54 and likewise within the grooves 18 formed in the rubber pad 11 carried by plate member 1 When so positioning the glass sheets for grinding, it is of course desirable that some means be provided for limiting the inward movement of the lsaid sheets when they are inserted within the Work holder and for also lining up the curved edges 49 of the several sheets to be ground. For this purpose, there is provided a horizontal metal roller carried by the Work holder and against which the inner edges of the glass sheets are adapted to abut, said roller extending transversely of the said work holder and being supported i at its opposite ends upon rods H2 and ||3, each of said rods being sli'dably received within a sleeve |4 pivotally mounted at its inner end upon a pin ||5 (Fig. 3) carried bythe work holder. The rods ||2 and ||3 are slidablyassociated with the sleeves ||4 so that the roller can be moved inwardly or outwardly to accommodate glass sheets of diierent shapes and sizes, each rod being secured within its respective sleeve by a set screw H5.

Also carried by each of the side members 46 andv 41 of work holder '45 -is an angle plate ||1 having a horizontal portion adapted to 'support the respective sleeve H4 and t'o in this manner limit the downward movement of the roller. t

is preferred that the metal roller l be covered with a rubber sleeve H8 which is Yadapted to engage the edges of the glass sheets. In positioning the glass sheets within the work holder, therefore,the said sheets are moved inwardly until the edges 49 thereof to be ground abut the roller it being of course understood that the. roller has first been adjusted tothe desired position. In order to facilitate the adjustment of the roller 50 within the arcuate slot 56, there may be carried by the supporting bolt 55 thereof' an arm ||9 pivoted upon the pin ||5 inwardly of side member 46 (Fig. 5). The nut 51 can also be formed with a handle |20. By turning the handle |20 to loosen nut 51, the supporting bolt 55. can be moved upwardly or downwardly within the arcuate slot 56, being swung about the aXis of pin ||5. When the roller has been moved to the desired position, it can be secured in such position by simply turning the handle |20 to tighten the nut 51.

After the glass sheets have been properly positioned, the motor |05 is placed in operation to rotate the shaft |94 and draw the pitman |02 downwardly, this movement of the pitman causing the shaft 89 to be rocked in a counterclock- Wise direction and imparting a forward horizontal movement to the connecting

rods

91 and 99. This forward movement of the connecting rods will cause the Work holder 45 to be also rocked in a counterclockwise direction upon the pins |00 and during the turning of the said work holder, the curved edges 49 of the glass sheets 48 will .of course be moved over and in engagement with the grinding wheel l5, being received within the grooves I9 thereof. The grinding wheel is being simultaneously driven, preferably though not necessarily, in the opposite direction. The work holder may be turned approximately 90 degrees and at the limit of its backward movement will assume substantially the position illustrated in Fig. 12. Thus, the curved edges 49 of the glass sheets may be ground from substantially the point c on edge b to the corner d.

Upon rocking of the work holder 45 in a counterclockwise direction and especially when it is desired to grind the edges 49 of the glass sheets tor the corner d or, in fact, to any point above the normal position of the roller I, it becomes necessary that some means be provided for moving the said roller away from or out of engagement with the sheet edges. To accomplish this, there may be carried upon the top of the receptable 28, at opposite sides of the grinding wheel I5, the vertical plates |2| and |22 adapted to be engaged by the roller upon rocking movement of the work holder in aV counterclockwise direction to move the said roller out of engagement with the sheet edges to permit the grinding thereof. Thus, when the work holder reaches the position illustrated in Fig. 12, the roller is entirely out of engagement with the glass sheets so that the said sheets are supported entirely upon the grinding wheel. The roller may be provided adjacent its opposite ends with collars |23 and |24 which are adapted to engage the inclined edges |25 and |26 of the plates |2| and |22 respectively.

When the work holder has been moved to the position illustrated in Fig. 12, the crank |03 has completed approximately one-half a revolution so that upon continued turning of the said crank, the pitman |02 will be started' upwardly, thereby causing the shaft S9 to be rocked in a clockwise direction to effect backward movement of the connecting

rods

91 and 99. This movement of the connecting rods will in turn cause the work hold- Aer45 to be rocked upon the pins |00 in a clockwise direction to return it to its starting position shown in Figs. 1, 3, and 10. As the workk holder is rocked in aclockwise direction to return it to starting position, thev roller will be automatically caused to return toits normal position in engagement with the edges 49 of the glass sheets, the return movement of the said roller being limited by the plates 1. engageable by sleeves |4.

It will of course be readily apparent that upon rocking of the work holder 45, the said holder will be permitted to simultaneously move freely vertically, depending upon the curvature of the sheet ledges being ground. This is due to the fact that the supporting arms 81 and 88 are freely mounted upon shaft' 89.l The pins |00 may therefore be said to constitute a floating axis upon which the Ywork holder may be rocked. The machine herein provided is therefore capable of grinding glass sheets of various sizes and shapes rapidly, accurately, and' economically and with a minimum effort and attention on the part of the operator.

As pointedV out above, it is preferable that the lweights 9| be such as to just counterbalance the work holder 45 so that the only pressure exerted upon the sheet edges being ground will be the weightv of the sheets themselves. However, by removing some of the weights so that they are not sufficient to counterbalance the holder 45, the presure upon the sheet edges being ground will be increased whereas by adding additional weights, the pressure upon the sheet edges can be reduced.

It is desirable in the operation of the machine to effect a slight raising of the glass sheets at the completion of the grinding operation to lift the said sheets out of contact with the grinding wheel in order to prevent burning of the edges being ground. To this end, there is carried by the work holder 45 a pair of freely rotatable rollers |21 and |28 mounted upon the opposite ends of a bolt |29 passing transversely through the side members 46 and 41 and secured in place by nuts |39. These rollers are arranged outwardly of the said side members 'andare of such diameter that they project slightly beneath the bottom edges thereof. Carried upon the top of the receptacle 28, adjacent one end thereof, for cooperation with the rollers |21 and |28, are the spaced blocks |3| and |32.

Upon the return of the work holder 45 to its starting position, the rollers |21 and |28 engaging `blocks |3| and |32 will effect a slight tilting or raising of the said holder sufficient to lift the edges of the glass sheets out of contact with the grindingwheel as illustrated in Figs. 1 and 10. Upon loading of the work holder preparatory to the grinding operation, the said holder is also adapted to be in this position so that the curved edges 49 of the glass sheets will not contact with the grinding wheel as the said sheets are being placed in position. When the motor |05 is subsequently placed in operation to rock' the work holder, the curved edges of the glass sheets will be gradually -lowered to engage the grinding wheel as illustrated in Fig. 11.

Ordinarily, it will be found that one backward and forward rocking movement of the work holder will be sufficient to effect the desired grinding of the glass sheets. Therefore the present invention further contemplates the provision of means for automatically shutting off the motor |05 to stopthe rocking movement of the work holder at the completion of the grinding operation. Thus, there is carried by the receptacle 28 a limit switch |33 connected in circuit with and adapted to control the operation of motor |05, said switch being provided with a control arm |94 -to which is pivoted, as at |35, a lever |36. Carried at the upper end of this lever is a roller |31,

aoues.

while. the. lower endthereof is notched as` at |38- to provide a hand grip for theoperator.

Secured to the

side member

4,6 of work holder 4,5 for cooperation with the switch |33 is a trip member |39 (Figs. 1, 2, and 7). In operation, after the work holder has been rocked in a counterclockwise direction and then returned to its starting position to complete the grinding cycle', the trip member |39 engaging the roller |31 will force4 the control arm |34 downwardly toY open the switch |33, thereby breaking the circuit through the motor |05 and stopping the movement of the work holder. The trip member, however, is not adapted to actuate the switch until after the rollers |21 and |28, engaging blocks |3| and |32, have caused the glass sheets to be lifted out of contact with the grinding wheel.

When it is desired to again place the. machine in operation, it is simply necessary for the operar. tor to swing the lever |36 about its pivot |35 to the position indicated by the broken lines in Fig. '7. This swinging movement of the lever will permit the control arm |34, which is of the spring-,- pressed type, to be automatically moved upwardly to again close the switch and start the motor |05.

As pointed out above, with the machine operating as illustrated in the drawings, the edges of the glass sheets can be ground from substanfy tially the point c to the corner d. I-Iowever, vit may not always be desirable to grind this particular length of edge contour and therefore means is herein provided for regulating theA length of arc or edge contour to be ground. Forthis purpose, the crank |03 is madev adjustable toV increase or decrease the degree of rocking movement of the work holder. Thus, as shown particularly in Figs. 1 and 9, the crank is formed with a slot or guideway |40 within which is re.- ceived the bearing block |4| carrying a horizontal pin |42 to which the lower end of the pitman |=02 is suitably connected. The bearing block |4| is threadedly mounted upon a screw |43 passing loosely through the end plate |44 of the crank, said screw being provided with annular flanges or washers |45 at opposite sides of the plate L44. so that it has rotatable but non-slidable move. ment. The screw |43 is also provided with a head |46 which may be engaged by a Wrench or some other tool to effect the turning thereof. By rotating the screw |43, the bearing block |4| can be threaded inwardly or outwardly thereupon as, desired to increase or decrease the throw ofthe crank and in consequence the rocking movement of the work holder.

The pitman |02 is made adjustable so that it is possible to grind up to the corner d of the glass sheets without excessive champer. In otherV words, by adjusting the length of the pitman, which can be effected by proper rotationr of the turnbuckle ||0, it is possible to control the. point at which the grinding of the sheet edges stops.

While the machine has been referred to above as a' grinding machine and also while it isprimarily designed for this purpose, yet it may be readily adapted for polishing the curved edges o f the glass sheets by the substitution of a suitable polishing wheel for the grinding wheelA I6.

' It is to be understood that the form of the in vention herewith shown and described is to be taken as the preferred embodiment 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 the invention 0r the sffcpeof the SubioinfrL claims.

Iclaim:

1. In a machine for grinding the curved edges of; a glass, sheet or plate, a rotary grinding wheel pstioned to rotate about a substantially horizontal axis, means mounted abovesaid wheel for supporting the glass sheet to be ground on edge ina a substantially vertical position, means for rocking` said supporting means to move the, curved edge of the sheet to be ground over and in engagement with said grinding wheel, means engaging the edge of the sheet to be ground to` assist in` properly positioning the said sheet for grinding, and means forA moving said last-mentioned means away from said edge to permit the grinding thereof upon rocking of the sheet supporting means.

2. In a machine for grinding the curved edges of a glass sheet or plate, a rotary grinding wheel positioned to rotate about a substantially horizontal axis, means mounted above said wheel for supporting they glass sheet to be ground on edge inY a substantiallyv vertical position, means for rocking said supporting means to move the curved edge of the sheet to be ground overV and in engagement with said grinding wheel, and pivotally mounted means engaging the edge of the sheet to be. ground to assist in properly positioning4 the. said sheet for grinding, said last-mentioned meansl being automatically movable away from said edge to permit the grinding thereof upon rocking. of the sheet supporting means.

3. In a machine for grinding the curved edges of a glass sheet or` plate, a rotary grindingA wheel positioned to rotate about a substantially horizontal axis, means mounted above said wheel for supporting the glass sheet to be ground on edge in a substantially vertical position, means for rocking. said supporting means to move the curved edgeA 0f the sheet to be ground over and in eng'agem'ent with said grinding wheel, pivotally mounted means engaging the edge of the sheet to be ground to assist in properly positioning the said sheet for grinding, and means disposed in the. path of4 said last-mentioned means for moving theA same away from said edge to permit the grinding thereof upon rocking of the sheet supporting means.

4. In a machine for grinding the curved edge of a glass sheet or plate, a rotary grinding wheel positioned to rotate about a substantially horizontal axis, a work holder above said Wheel for, supporting the glass sheet to be ground on edge in a substantially vertical position, means for rocking said Work holder to move the curved edge of the sheetV to be ground over and in engagement with said grinding wheel, meansY carried by the work holder and engaging the edge of the sheet to be ground, and means for moving said lastementioned means away from said edge toA the grinding thereof upon rocking of the work holder.

5- 11,1. a. maghi@ for grinding the Curved edge of a, glass sheet or plate, a rotary grinding wheel positionedl to rotate about a substantially horizontal axis, a work holder above said wheel for supporting the glass sheet to be ground on edge in a substantially vertical position, means for rocking said work holder to move the curved edge of the sheet to be ground over and in engagement with said grinding wheel, and pivotally mounted means carried by the work holder and engaging the edge of the sheet to be ground, s aid last-,mentioned means being automatically movable away from said edge to permit the grinding thereof upon rocking of the work holder.

6. In a machine for grinding the curved edge of a glass sheet or plate, a rotary grinding wheel positioned to rotate about a substantially horizontal axis, a work holder above said Wheel for supporting the glass sheet to be ground on edge in a substantially vertical position, means for rocking said work holder to move the curved edge of the sheet to be ground over and in engagement with said grinding wheel, pivotally mounted means carried by the work holder and engaging the edge of the sheet to be ground, and means disposed in the path of said lastmentioned means for moving the same away from said edge to permit the grinding thereof upon rocking of the work holder.

7. In a machine for grinding the curved edge of a glass sheet or plate, a rotary grinding Wheel positioned to rotate about a substantially horizontal axis, a work holder above said wheel for supporting the glass sheet to be ground on edge in a substantially vertical position, means forV rocking said work holder to move the curved edge of the sheet to be ground over and in engagement with said grinding wheel, pivotally mounted means carried by the work holder and engaging the edge of the sheet to be ground, and means for moving said last-mentioned means away from said edge to permit the grinding thereof upon rocking of the work holder in one 'direction, said pivotally mounted means being automatically returned to sheet edge engaging position upon rocking of the said work holder in the opposite direction.

8. In a machine for grinding the curved edge of a glass sheet or plate, a rotary grinding wheel positioned to rotate about a substantially horizontal axis, a work holder above said wheel for supporting the glass sheet to be ground on edge in a substantially vertical position, means for rocking said work holder to move the curved edge of the sheet to be ground over and in engagement with said grinding wheel, pivotally mounted means carried by the work holder andA engaging the edge of the sheet to be ground, means disposed in the path of said last-mentioned means for moving the same away from said edge to permit the grinding thereof upon rocking of the work holder in one direction, saidV pivotally mounted means being automatically returned to sheet edge engaging position upon rocking of the work holder in the opposite direction,

and means carried by the said work holder for supporting the pivotally mounted means and for limiting movement thereof in one direction. l 9. In a machine for grinding the curved edge of a glass sheet or plate, a rotary Vgrinding wheel positioned to rotate about a substantially 'horizontal axis, means arranged above said wheel for supporting the glass sheet to be ground-onV edge in a substantially vertical position, means for rocking said supporting means to move the curved edge of the sheet to be ground over and in engagement with said grindingwheel, means for pivotally mounting the .supporting means upon a floating axis so that it is capable of free vertical floating movement during the rocking thereof, means carried by said supporting means and engaging the edge of the sheet to be ground, and means for moving said last-mentionedr means away from said edge to permit the grinding thereof upon rocking of the said sheet supporting means.l Y

10. In a machine for grinding Vthe curved edge of a glass sheet or platea rotary grinding wheel positioned .to rotate about a" substantially hori- Zontal axis, a work holder arranged above said wheelfor supporting the glass sheet to be ground on edge. in a substantially vertical position, means for rocking said work holder to move the curved edge of the sheet to be ground over and in engagement with said grinding wheel, means for pivotally mounting the work holder upon a floating axis so that it is capable of free vertical floating movement during the rocking thereof, pivotally mountedmeans carried by the Work holder and engaging the edge of the sheet to be ground, andmeans for automatically moving said last-mentioned means away from said edge to permit the grinding thereof uponrocking of the work holder. Y

11. In a machine forV grinding the curved edge of a glass sheet or plate, a rotary grinding wheel positioned to rotate about a substantially hori- Zontal axis, a work holderv arranged above said Wheel for supporting the glass sheet to be ground on edge in a substantially vertical position, means for rocking saidworkholder to move the curved edge of the sheet 'to' be ground over and in engagement with said grinding Wheel, means for pivotally mounting the work holder upon a oating axis so that it is capable of free vertical floatingfmovement'during the rocking thereof, pivotally mounted means carried by the Work holder and engaging the edge of the sheet to be ground, and means disposed in the path of said last-mentioned means for moving the same. away from said edge to permit the grinding thereof upon rocking of the work holder in one direction, said pivotally mounted meansbeing automatically returned to sheet edge engaging position' upon rocking ofthe work holder in the opposite direction. 5

12. In a machine for simultaneously grinding the curved edges ofV a plurality of glass sheets or plates, a rotary grinding wheel positioned to rotate about a substantially horizontal axis, means arranged above said wheel for supporting the glass sheets to be ground on edge in a substantially vertical position including spaced vertical side members between which said sheets are received and means carried by and arranged between said side members for maintaining the said sheets in position during grinding, means for rocking the supporting means to move the curved edges of the sheets to be ground back and forth over and in engagement with said grinding wheel, means carried by the side memers of said sheet supporting means and engaging the edges of the sheets to be ground, and means for moving said last-mentioned means away from the sheet edges to permit the grinding thereof upon rocking of the sheet supporting means.

13. In a machine for simultaneouslyV grinding the curved edges of a plurality of glass sheets or plates, a rotary grinding wheel positioned to rotate about Va substantially horizontal axis, means arranged above said wheel for supporting-the glass sheets to be ground on edge in a substantially vertical position including spaced vertical side members between which said sheets are reoeived and means carri-ed by and arranged between said side members for maintaining the said sheets in position during grinding, means for rocking the supporting means to move the curved edges of the sheets to be vground back and forth over and in engagement with said grinding wheel, means pivotally carried by the lside members of said sheet supporting means and engaging the edges of the-sheets to be ground, and fixed means disposed in the vpath of said last-mentioned means for moving the same away from the sheet edges to permit the grinding thereof upon rocking `of the sheet supporting means.

14. In a machine for simultaneously grinding the curvededges of a plurality of glass sheets or plates, a rotary grinding wheel positioned to rotate about a substantiallyy horizontal axis, means arranged above said wheel for supporting the glass sheets to be ground on edge in a substantially Vertical position including spaced vertical side members between which said sheets are received and means carried by and arranged between said side members for maintaining the said sheets in position during grinding, means for rocking the supporting means to move the curved edges of the sheets to be ground back and forth over and in engagement with said grinding wheel, means pivotally carried by the side members of said sheet supporting means and engaging the edges of the sheets to be ground, xed means disposed in the path of said last-mentioned means for moving the same away from the sheet edges to permit the grinding thereof upon rocking of the sheet supporting means in one direction, said pivotally mounted means being automatically returned to sheet edge engaging position upon rocking of the said supporting means in the opposite direction, and means carried by the side members of the sheet supporting means for supporting the pivotally mounted means and for limiting movement thereof in one direction.

15. In a machine for simultaneously grinding the curved edges of a plurality of glass sheets or plates, a rotary grinding wheel positioned to rotate about a substantially horizo-ntal axis, a work holder arranged above said Wheel for supporting the glass sheets to be ground on edge in a substantially vertical position including spaced vertical side members between which said sheets are received and means carried by and arranged between said side members for maintaining the said sheets in position during grinding, means for rocking said work holder to move the curved edges of the sheets to be ground back and forth over and in engagement with said grinding wheel, means for pivotally mounting the work holder upon a floating axis so that it is capable of free vertical floating movement during the rocking thereof, means carried by the side members of said work holder and engaging the edges of the sheets to be ground to assist in the proper positioning of the said sheets for grinding, and means for moving said last-mentioned means away from the sheet edges to permit the grinding thereof upon rocking of the sheet supporting means.

16. In a machine for simultaneously grinding the curved edges of a plurality of glass sheets or plates, a rotary grinding wheel positioned to rotate about a substantially horizontal axis, a work holder arranged above said wheel for supporting the glass sheets to be ground on edge in a substantially vertical position including spaced vertical side members between which said sheets are received and means carried by and arranged between said side members for maintaining the said she-ets in position during grinding, means for rocking said work holder to move the curved edges of the sheets to be ground back and forth over and in engagement with said grinding wheel, means for pivotally mounting the work holder upon a floating axis so that it is capable of free vertical floating movement during the rocking thereof, means pivotally carried by the side members of the work holder'and engaging the edges of the sheets to be ground, and xed means disposed in the path o'f 'said last-mentioned means for moving the -same away from the sheet edges to permit the grinding thereof upon rocking yof the work holder in one direction, said pivotally mounted means being automatically returned to sheet edge engaging position upon rocking of the said'work holder in the opposite direction.

17. In a machine for simultaneously grinding the curved edges of a plurality of glass sheets or plates, a rotary grinding Wheel .positioned to rotate about a substantially horizontal axis, a work holder arrangedV above said wheelfor'isupporting the glass sheets to be ground on edge in a substantially vertical position including spaced vertical side members between which said sheets are received and means carried by and arranged betwen said side members for maintaining the said sheets in position during grinding, means for rocking said work holder to move the curved edges of the sheets to be ground back and forth over and in engagement with said grinding wheel, a horizontally disposed roller engaging the edges of the glass sheets to be ground, supporting means for the roller pivotally connected to the side members of the work holder, and means engaging said roller for moving the same out of engagement with the sheet edges to permit the grinding thereof upon rocking of the work holder in one direction, said roller being automatically returned to sheet engaging position upon rocking of the said work holder in the opposite direction. Y

18. In a machine for simultaneously grinding the curved edges of a plurality of glass sheets or plates, a rotary grinding wheel positioned to rotate about a substantially horizontal a'xis, a work holder arranged above said wheel for supporting the glass sheets to be ground on edge in a substantially vertical position including spaced vertical side members between which said sheets are received and means carried by and arranged between said side members for maintaining the said sheets in position during grinding, means for rocking said work holder to move the curved edges of the sheets to be ground back and forth over and in engagement with said grinding wheel, a horizontally disposed roller engaging the edges of the glass sheets to be ground, supporting means for the roller pivotally connected to the side members of the work holder, fixed means disposed in the path of said roller for moving the same out of engagement with the sheet edges to permit the grinding thereof upon rocking of the work holder in one direction, said roller being automatically returned to sheet engaging position upon rocking of the said Work holder in the opposite direction, and means carried by the work holder for supporting the roller and for limiting the return movement thereof.

19. In a machine for grinding the curved edge of a glass sheet or plate, a rotary grinding wheel positioned to rotate about a substantially horizontal axis, means mounted above said wheel for supporting the glass sheet to be ground on edge in a substantially vertical position, an arm toy which the supporting means is pivoted on a horizontal axis for rocking movement to carry the curved edge of the glass sheet over the grinding wheel, a pivotal support for the arm at one side of the axis of rotation of the grinding wheel about which the arm swings freely during the grinding operation, movable means on the sheet supporting means maintained by gravity in holding engagement with the curved edge of the sheet, stop means positioned so as to engage the movable means and disengage it from the glass sheet after the curved edge has been partially ground, and means for rocking said supporting means.

l 20. In a machine for grinding the curved edge of a glass sheet or plate, a rotary grinding wheel positioned to rotate about a substantially horizontal axis, means mounted above said wheel for supporting the glass sheet to be ground on edge in a substantially vertical position, an arm to which the supporting means is pivoted on a horizontal axis for rocking movement to carry the curved edge of the glass sheet over the grinding wheel, a pivotal support for the arm at one side of the axis of rotation of the grinding wheel about which the arm swings freely during the grinding operation, a member mounted on the sheet supporting means for swinging movement toward the curved edge of the sheet yieldingly maintained in engagement therewith, stop means positioned so as to release said member from the. edge of the sheet during the last part of the rocking movement of the supporting means, and means for rocking said supporting means.

JOSEPH P. CROWLEY.