US1987054A - Edge grinding machine - Google Patents

Description

Jan. 8, 1935. J. P. CROWLEY EDGE GRINDING MACHINE 1934 4 Sheets-Sheet 1 Filed May 17,

Q/dSEPH P GFOWLEX Z44 g Quorum Jan. 8, 1935. J, P, CROWLEY EDGE GRINDING MACHINE Filed May '17, 1934 4 Sheets-Sheet 2 1 (2)06L'PH CROWLEY y Jan. 8, 1935. J. P. CROWLEY EDGE GRINDING MACHINE Filed May 17, 1954 4 sheets-Sheet 5 Juventpr dost- H P dronu-v Gttcrncg Jan. 8, 1935. v J. P. CROWLEY 1,987,054

EDGE GRINDING MACHINE Filed May 1'7, 1934 4 Sheets-Sh et, 4

3nven tor Q/OSEPH P CROWLEY attorney Patented Jan. 8, 1935 1,987,054 1 EDGE, GRINDING MACHINE g Joseph P. Crowley, Toledo, Ohio, assignor tov Libbey-Owens-Ford Glass Company, Qhio, a corporation of Ohio Toledo,

ApplicationMay 17, 1934, serial No. 726,055

19 Claims.

I: The present invention relates broadly to improvements in grinding machines generally and more particularly to a machine for rounding end/or finishing the edges of sheets or plates of:

-5 ass en ih the" provision of a grinding machine of relatively simplified and inexpensive construction primarily designed for use in grinding the curved edges or corners of sheets or plates of glass which are to be employed as door or window lights in automotive vehicles, although it is ofcourse-in no way restricted tosuch use.

Another object of the invention isthe provision of such a grindingmachine of the abovecharacter different l' contour s and embodying generally a rotary grinding wheehmeans-mounted above said wheel for, supporting, a plurality of glass sheets tobe treated, an'd means for .r,ocking said sup. porting means. to move the glass sheets backward 1 and forward with the curyededges =thereofto be ground over and in engagement with the grinding wheeL-said sheet supporting means being mounted for free vertical-guided movement during therocking thereof. and'dependingupon the contour or curvature of :the edges beingsurfaced.

Other objects-and advantages of theinvention will becomemore apparent during the course of the following description when taken in connection with the accompanying drawings. I In the drawingsswherein like numerals. are em ployed to designate like parts throughout the samel I Fig. 1 is" a side elevation of an installation ineluding two" spaced' igrinding machines constructed in accordance withthepresent invention and a' conventional polishing machine arranged therebetween,

Fig.2'is a vertical section through one of the I grinding machines taken substantially on. line 242 f Fig.1, V I q Fig. 3 -is a'detail 'sectiontaken substantially on line 3- -3 of Fig. 2, 5

Fig. 4 is a perspective view ofthe upper portion of the grinding machine showing particularly the AnimpQrtant object of thisinvention resides in and 8 to 10.

means for supporting .the".glass sheets to be. treated, f. Fig.5 is a ,detail section taken-substantially on line 55 of Fig.2, Fig 6 is a section taken substantially on-line, 66ofFig.4, J

Fig. 7 is a View of one of the side members of the.glasssupportingmeans, H I Figs. 8,.9 andlo'are side viewsshowing different positions assumed by the sheet supporting means and the glass sheets during the grinding operation, and v Fig. 11 is a side elevation of the sheet support.- ing means modified to receive glass sheets having a difierent contour from those disclosed in Figs. 1

Referring now to the drawings and particua larly to Fig. 1, there is illustrated one type offactory installatiorrembodying two grindingimachines A and B, constructed in accordance with the present invention and a conventional polish: ing machine C. The grinding machines are disposed opposite one another in spaced relation and the polishing machine is arranged thereb etweenr The edges of the glass sheets 15, after being; ground upon the grinding machines A. and B,;'areadapted to be polished upon the polishing ma chine C. With this particular installation,. a single polishing machine can handle the glass ground uponboth grinding machines inasmuch as it takes longer to grind than to polish. Thus,

While one of the grinding machines-is in operation,"

an operator can be removing'the ground sheets from the other grinding machine and effecting the polishing or finishing of the edges of said sheets upon the polishing machine. The polishing machine includes a polishing wheel 16 rotatable; about a substantially horizontal-axis within a receptacle 1'7 adapted to contain a suitable polish-v ing material withinwhich the lower portion of; the said polishing-wheel rotates as is well knownin the art.- The glass sheet, shown in broken;

lines and designated 15a,is adapted to be manu-, ally moved, by the operator back and forth over the polishing wheel. h p

In order to facilitate the transfer of theglass sheets from the grinding machines A. and B to the polishing machine C,.there may.be arranged at opposite sides of the said polishing machine a runway D comprising a series of horizontally I aligned rotatable rolls 18. The operator cahthen" slide the glass sheets from the grinding machines along the runway to the polishing machine. 'Thei installation shown in Fig. 1 will ermit; of the grinding and polishing of a maximum number'ot sheets rapidly and conveniently and with a minimum amount of handling. If desired, however, two polishing machines can be employed, with each of the polishing machines being adapted to receive the glass sheets from one of said grinding machines.

The grinding machines A and B are adapted'to produce 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. Inasmuch as the two grinding machines are of exactly the same construction, a detailed description of only one will .be given. Thus, upon reference particularly to Fig. 2, each grinding machine includes a base 19 which is adapted to supportthe rotary grind ing wheel 20 and the motor 21 for driving the same, said motor being mounted upon the top of said base and the grinding wheel being arranged to one side thereof.

The grinding wheell20 is keyed to one end of a horizontal shaft 22' and is provided in its" periph being journalled at its outer end in a bearing 26 carried by a gear case 27 suitably secured to the" Said; Keyed to the shaft ,22within gear.

case 27 is a relatively large gear 28 meshing with a relatively smaller gear 29' fixed to the shaft 30 of motor 21, said shaft being preferably iour naled' in a bearing 31 also carried by gear case 27. Upon operation of the motor'21, it will be readily apparent that the shaft 22 will be: driven through thei'ntermeshing gears 28 and 29"to effect thepes'it'i'verotation or the grinding wheel.

cept'aele 32 within' which the grinding'wheel" 20 is received, said receptacle being adapted to contain-a suitable abrasive material. within which the lower portion of the said wheel is immersed in a manner well known in the art. The top of the receptacle 32 is provided with aslot 33 through which the upper portion of thegrinding wheei project'si The receptacle is also; preferably provided with a door 34 to permit access thereto' and a drain outlet 35 at one corner thereof.

The base 19' is slidabiy associated with the re"- ceptacle 32 so that it can be moved vertically relative thereto to either raise or lower the grinding wheel. I To this end, the rear vertical wall 36 or the receptacle is formed with a vertical underout n el or way 3' g. 3-) within which the slide 38 formed on or carried by the base 19 is received. The rear wall of said receptacle is also provided with a vertical slot 39 through. which projects the annular portion 40 of the base 19 within'whic'h bearing 24 is mounted.

The base 1 9 is supported upon a screw 41 threaded at its lower end within a vertical cylin derojr sleeve 4'2 carried upon the base portion 43 of receptacle 32. The base 19 is formed with a recess 44'', and keyed to the upper end of screw shaft 4'7 is arod48 constituting a handle which may be grasped by the operator to facilitate the turning of shaft 47. From the above, it will be seenthat when it is desired to either raise or lower the base 19 and consequently the grinding wheel 20, it is simply necessaryfor-the operator to grasp the handle 48 and turn the shaft 47 in the desired direction. The rotation of gear 46 will serve to effect a corresponding rotation of gear and upon rotation-i015 thls'latter gear, the screw 41 will bethreaded upwardly or downwardly within the sleeve 42 to effect either the raising or the lowering of the base and grinding wheel.

The means for supporting the glass sheets 15 to be ground comprises a carrier or holder designated in its entirety by the numeral 49, said,

holder being mounted above the grinding wheel 20'tor free vertical. and rocking movement relative thereto as will be more fully hereinafter described. The work holder 49 comprises a pair of spaced vertical sidemembers 50 and 51 between which a plurality of the glass sheets 15 are adapted to be received sothat the edges thereof} may be ground simultaneously, said sheets being disposed on edge ina vertical position and thesaid side members 50 and 51 being so-shaped that upon rocking of the work holder, the-curved edges or corners 52 of the glass sheets tobe treated will be moved backwardQand forward over-and in engagement with the grinding wheel. It will be noted that the sidemember 51' is relatively" smaller than side member 50.

5 Arranged transversely between and carriedby the side members 50 and 51 of work holder 49 are the two rollers 53 and 54- respectively, said rollers 50, adjacent the upper end thereof, are the three rollers 55', 56- and 57, while carried thereby ad jacent the lower end thereof and in substantial V v 7 h alignment with roller v54 are rollers 58 and 59. Arranged at the front of the base 19 is a re'- The rolls;53 to 59 are adapted to receive the glass sheets 15 therebetween and to maintain thei'nin proper position within the work holder during the grinding operation, the grinding of glass sheets of different contours bringing into use difierent rollers. For instance, as shown in Figs. 1 and-"8f to 10, the glass sheets 15" are maintained in posi- f 54,55, 56 and 58, the roller 57 having'been removed. Were the sheets 15b slightly longer, they would also be supported by the roller 59;

The roller 53 comprises a horizontal bolt60 (Fig. 6) having its inner end extending through an inclined slot 61 in the side member 50 and being secured inplace by a nut The opposite or outer end of the bolt extends through a cir-" the bolt 60 is a metal bushing 65 carrying a sleeve 66 preferably made of relatively soft rubber.

This sleeve is formed with a plurality of. unifo'nn I ly spaced annular flanges 67 which define therebetween a plurality of grooves 68 within. which grinding wheel 20. Carried upon the bolt at opposite ends of the sleeve 66 arecollars 69 and '10.

The roller 54 is of the same constructionjand.v

arrangement as roller 53 and is carried by' the side members 50 and 51 in the same manner, the

D011 60 thereof passing through an inclined'slot 71in side member 50. The slots'ql and '71 in side member are'provided in orderto facilitate the proper positioning of the side'm'ember 51'withber and being secured in place by nuts threaded upon the said boltsoutwardly thereof; The slots '12 to 76-are provided to permit-the rollers to 59 respectively to ;be adjusted with respect to "one another in a manner to permit of the-grinding of glass sheets of different sizes. Likewise, any one of the rollers 55 to 59 can be readily and conveniently removed should it be found necessary in order to accommodate a particular. shape :or sizeof sheet. Forinstance, a glass sheet 15 of one particular. shape and size is'illustrated in :Figs. 1'

and 8 to 10, and in this case'the upper substantially horizontal straight edge a thereof. engages the rollers 55 and 5 7; the curved. bottom edge'b thereof the rollers 54 and 58; and the substantially vertical straight edgec the roller 53'. The bottom edge I; and sideedge c' areconnected by the corner or curved edge 52 to :be ground; On the other hand, in Fig. 10, and because of the particular shape of the glass sheet 15b, the-roller 57 has been'removed and theupper edge d of the said sheet engages roller 56; the inner curved edge e the rollers 53 and 55; and the bottom edge ,1 the rollers 54 and 58. The curved edge e and bottom edge 1 are connectedby the curved edge 52 to begiound. The rollers 55 to; 59 are of course each provided with a plurality of grooves 68 which arein alignment with thegroovesinrollers 53 and 54 and likewise in 'registrywith the grooves in thegrinding wheel. I

Mounted 'upon the top of the receptacle 32 at opposite sidesthereof is a pair of" opposed guide brackets '77 and 78' respectively, each being formed with a vertical guideway '79 within which is slidably-mounted a-guide block"80 for free ver tical movement." Securedto'the outer surfaces of the side members 50 and 51 of the work holder.

and extending diagonally thereoi are plates 81 and 82 respectively. Carried byeach of the side members 50 and'51 of the workholder' and passing transversely through the respectiveplate 81 or 82 (Fig. 5) is a trunnion 83 riveted to the said side member as--at 84. Each 'trunnion projects: outwardly beyond the respective plate 81 or 82 and is loosely received within the respective guide block 80 so that it can turn freely relative thereto; With this construction, it will be readily apparent that the trunnions 83' define a horizontal axis about which the work holder 49 is adapted'to be rocked to move the corners or curved edges of the glasssheets to be ground over and in engagement with the grinding wheel and; that during such rocking movement the said'work holder will be permitted to move freely'vertically, depending shaped crank levers 91 and 92 respectively, said crank levers being mounted intermediate their and '59 are also a of subends upon a horizontal shaft 93 journaledin the horizontal bearing 94 formed at the upper end of a bracket 95 secured to the receptacle 32 by'bolts or other suitable fastening elements 96.

I Carried at the opposite or outer ends of the V- shaped levers 91 and 92 are pins 97 and 98 to which are pivotally connectedthe upper ends of the substantially vertical pitman rods 99 and 100, each of said rods being also pivotally connected at its lower end to a crank 10,1 keyed to a horizontal shaft 102, said shaft being driven from a motor 103 through a suitable drive 104 and reduction gearing'located' in the housing 105. Upon rotation of the shaft 102, the pitman rods 99 and will be given a substantially vertical up and down motion'to effect the rockingof the \l shaped crankievers 91 and 92' first in one direction and then the other to impart a' substantially horizontal forward and'backward motion to the connecting rods 8'? and 88. The reciprocation of the connecting rods will cause a rocking of the work holder 49 as the trunnions 83 turn freely within guide blocks 80, thereby causing the glass sheets 15 to be moved backward and forward, with the curved edges 52- thereof tobe' ground over and in engagement with the'grinding wheel 20. Simultaneously with'its rocking movement, the said work holder will be permitted to move freely vertically as a result of the guide block 80 operating within guideways 79. In the operation of the machine described above and when it is desired to grind the curved I pit'man rods 99 and 100 will be at substantially the limit of their upward movement and the-connecting rods 8'? and 88 in their extreme forward position. The glass sheets to be ground are then inserted horizontally into the outer open'end of the work holder between the upper rollers 55 and 57 and the lower rollers 54 and '58, the upper" edges a of the'said sheets being received within the grooves in the first-mentioned pair of rollers,

while the bottom edges 2) thereof are received After the glass sheets have been thus properly" positioned the motor 103 is placed in'operation to rotate shaft 102 and draw the pitmen 99"and 100 downwardly, this movement causing the .crank levers 91 and 9 2'to be rockedin a counter-' clockwise direction to retract the connecting rods 87 and 88. .This movement of the connecting rods will cause the work holder 49 to be also rocked in a counterclockwise direction and during the turning of the said work holden'the curved edges 52 of the glass'sheets will of course be moved overand inengagement with the grind- .ing wheel 20, being received within the grooves 23 thereof. The work holder is turned approximately 90 and at the limit of its backward movement will assume substantially the position illustrated in" Fig. 10, at which time the glass sheets will be'supported upon the roller 53. r n

-When the work holder 49 is in this position; the crank 101 has completed approximately onehalf a revolution so that upon continued turning of the said crank, the pitmen 99 and 100 will be started upwardly, thereby causing the crank levers 91 and 92 to be rocked in a clockwise direction to effect forward movement of the connecting rods 87 and 88. This movement of the cam holder, preparatory to the grinding operation, the said holder is adapted to be in this position grinding wheel 20.

nectingrods will in turn cause the work holder to be'rocked also in a clockwise direction-toreturn. it to its starting position shown in Fig. 8. During the rocking of the work holder, the grinding wheel 20 isalso being positively driven from motor 21. g

,It will of course be readily apparent that upon rocking of the work holder 49, the said holder willbe permitted to simultaneously move freely vertically, depending upon the curvature of the sheet edges being ground, said work holder being guided in a definite path during its vertical movements by means of the guide blocks operating in the guideways 79 ofguide brackets 77 and '78. Due to the above construction,. curved edges of different contours can be readily and convenientlyground upon the machine and without necessitat-' ing any special adjustment totake careoi. 'each particular curve, except as regards the adjust ment of the rollersrelative to oneanother to take care of difierent size sheets. This renders themachine capable of a wide useand permits the simultaneous grinding of a plurality of sheets of. glass rapidly, accurately, and economically, and with a minimum efiort and attention on the part of the operator. While the machine has been referred to above as a grinding machine and,

also while it is primarily designed for this purpose, yet it may be readily adapted for polishing;

the curved edges of the glass sheets by the substitution of a suitable polishing wheel. for the 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 withthe grinding wheel in order to prevent burning of the edges being ground. To this end, there is carried upon the top of the receptacle 32,'adjacent the for- 7 Ward end thereof, two spaced blocks 106 and-l07 adapted to be engaged by the side members 50 and .51 respectively of the work holder at the completion of the grinding cycle to efiect a slight wheel (Fig. 8). Also, upon loading of the work so that the curved edges 52 of the glass sheets will not contact with the grinding wheel as'the said sheets are being placed in position. When the motor 103 is then 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. 9.

Ordinarily, it will be found that one backward and forward rocking movement of the work holder is sufficient to effect the desired grinding of the glass sheets. Therefore, the present invention contemplates theprovi sion of means for automatically shutting off the motor 103 and stopping the rocking movement of the work holder at the completion of the grinding operation. For

of the work holder for cooperation with the switch is a trip member 111 (Figs. 2, 8 and 10). In practice, after the work holder has been rocked in a counterclockwise direction to the position illustrated in Fig. 10 and then. returned to its starting position shown in Fig. 8 tocomplete the rindin'gtcychewthe trip member 1111 roller'llfi will force. the control. arm; lw downawardly'to open switehlfltl; thereby the.

circuit through motorlilaandfstopping the move-;

ment of the'work holder. The trip emberiii,

1 however, is not. adapted .to actuateswi-tch 103 m after the sidemembers 50'and 5 1 of the'work hold-1 er-eng-ag- ing blocks 106, and 107 haverCfil s l thej and thatwarious changes in theshape, size and arrangement of parts 7 may 5 be resorted to without departing fromthe spiritoi the invention (or the; scope of the :subioined claims. .Ielaim:

macli'ifie for? smidingme: curved glasssheet' plate armrmding when,

positioned to rotate. about a substantially-herb zontalfaxisymeans. above said. grinding;-

wheel: for supporting the. glass sheet: to *beground on edge in a substantially vertical position,;means for 'rockingfsaidsupporting means to move; the

means forwguiding th m supporting meansam, its vertical movements.

2. In a machine'for grinding the. curved-edgeof' a glass sheet orplate, a rotary grinding wheel po sitioned, torrotate abouts. substantially horizontal axis, means mounted-above giindinsrwheel for supporting ;the glass sheet to be ground on edge in a substantially vertical position means tor-mounting said sheet supporting meansefor free; verticaland rocking movement, means forrocking the supporting means,- ild ineansv for guiding the said supporting meansin adefinite pathduring v rt cal; movement thereof;

-'3. In .a ;machine. for grinding the curved; of a glasssheet or plate,:a'! 0$a y..flrinding wheel; positioned to; rotate about asubstantia-lly hori-- zontal axis, means mounted above saidgrinding wheel for supporting the glass sheet to beground on edge in asubstantially .vertioall'po sition, means for pivotally saidsheetrsupporting: means,- means for rock n the supporting meansabout its pivot to move. the curved edge of the sheet to begroundover and iniengagementiwith the grinding wheel, and means 'for -guidingly sup*-. po t the: said sheetsupnor msflmew for: re vertical; movement during the rocking thereof p 4. a'mae fo s l a eou v the curved iedgesyof awplurality. ofwglass sheets orplates, a rotary grinding wheel positione 1'0 "1'0- tate about a; substantially axis,a work? holder arranged above sa-ld wheel and adaptedtoi support the glass sheetsto beground on'edge; in a substantially; vertical. position, said work; holder includingspaced vertical side members be tween. whichsaid sheets are reoeivedand carried by and arranged between said side-1 members for maintaining the said sheets-in position during grinding, .means connected with the (work and in engagement with the; grinding wheel, said work :holder being mounted for-free vertical movement during the rocking thereofiand means for,

guiding the said work holder in its vertical movements. i

- In a machine for simultaneously grinding 50 I I e g received within said guideways, said last-menv 7. In a machine ,work holder is adapted to be rocked; ,and'means wconnected with said workholderlion-rocking the curvededges of a plurality of glass sheets or plates,

a rotary grinding wheel positioned to rotate about a substantially horizontal axis, a work holder, ar

' ranged above said wheel and adapted to support the glasssheets to be ground on edge in a substantially, vertical position, said work holder ineluding spaced vertical side-members between;- which said sheets are received and means carried same, and means for guiding the said work holder v.in a definite path during vertical movement j {are received and a plurality of horizontal rollers thereof. I I i i 6. In a machine for simultaneously grinding the curved edges of a plurality of glass sheets adapted to support the glass sheets to be ground on edge in asubstantially vertical position, said work holder including spaced vertical side members between which said sheets are received and means carriedby and arranged between said side sition during k grinding,

said work holder for rocking the same about its pivot to move the curved edges of the sheets over and in engagement with the grinding wheel, and

.means for guidingly supporting the said work holder for free vertical movement during the rocking thereof; I i v for simultaneously grinding the curved edges of a pluralityrof glass sheets or plates, a rotary grinding wheel positioned .to rotate about a substantially horizontal axis, a work holder arranged above said wheel and adapted to support the glass sheets to be ground on edge in; a substantially vertical position, said work holder including spaced vertical side members ;between which said sheets are received and means ;.carr ied by and arranged between said side members for maintaining the said sheets in position during grinding, f xed guide brackets mounted atopposite sides of the work holder and having vertical guideways therein, means carried by the sidemembers of said work holder and slidably tioned means being "constructed tocau se rocking movement ofthe' work holder relativev to said guide brackets, andmeans for rocking the said work holder to move the curved edges, of the sheets over and in engagement with the grinding wheel. l

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 and adapted to support the glass sheets to be ground on edge in a substantially vertical position, said work holder and loosely received within 'said blocks' .deflninga horizontal axis, about which the said same about such axisto; movethe curved edges of the sheets over and in engagement withthe I 9.,In amachine for simultaneously-grinding the curved edges of a plurality of glass sheetsor I v plates, a rotary grinding wheel positioned ;-t o,ro-

grinding wheel. 7 x

tateabout asubstantially horizontal axis and having a plurality of grooves formed ,in thepe- Q10 .above said grinding wheel and,comprising.spacedv vertical side members'betweenwhieh saidsheets carriedby and arranged-between said side members' for maintaininggthe glass sheets in position during grinding, said rollersbeing providedwith s 'o vesinr e st y witht e v i h ind? wheel and, within which the l edges of the glass sheets are adapted tQ be received, means for reeking said work holder to move thecur-vededgeszqf the glass sheets over and in engagement with the grinding wheel, saidwork, holder being mounted for free vertical movement? during ,the rocking thereof, and means for guiding the saidholder in its verticalmovements.

' 10. In; a machine for simultaneously grinding the curved edges of alplurality of glass sheets or plates, a rotary grinding Wheel positioned to ro- ,tate about a substantially-- horizontal axis-and having'a plurality of grooves formed in the peripherythereof, meansfor supporting the glass sheets to be, ground 1 on edge a substantially vertical position including a holder arranged above saidgrinding wheel and comprising spaced vertical side members between which said sheets I are received and a plurality ofhorizontal'rollers carried by and arranged between said side 'nein- ,bersfor maintaining the glass sheetsin position during grinding, said rollers being provided with grooves in registry with thegrooves in the grinding wheel and within which the edgesof the glass sheets are adapted to be received, means'f r mounting said work holder for freevertieal and rocking movement, means for rocking the work holder, and means for guiding]'the"said work holder in a definitelpath during verticalfmov'ee ment thereof. 11. In a machine for simultaneously, grinding the curvededges of a plurality of glass sheetsjor plates, a rotary grinding wheel positioned to 1'0- above said grinding wheel and comprising spaced vertical side members between which said sheets are received and a pluralityof horizontal rollers carried by and arranged between saidsidej'mem bers for maintaining the glass sheetsin position during grinding, said rollers being proyidedwith grooves in registry with the groovesthe grind} ing wheel and within which theedgesmi'the glass sheets are adapted to "be received,]means for pivotally mounting said workfholder, means .for rocking the work holder ab out itsjpivotfto move the curvededgesof the sheets over and in engagement with-the grinding; wheel, and

means for guidingly supporting the said work holder, for freevertical; movement during the oc t 1 1:

11 .11 a machine fo imultaneouslrlsr n ins the curved 'edges of a plurality of glass sheets or plates, a rotary grinding wheel positioned to rotat about a substantially horizontalaxis and a plurality of groovesio'rmed in the pe- 31 5 riphery thereof, means for supporting the glass "game brackets mounted opposite sides of the 3 work; holder and-havingvertical guideways there- 'infmeans oarried-bythe side members of said workholder and slidably received within said guidewa-ys; said Iasft mentionedmeanS being of jsu'h ionstructionas to ea'use; rocking movement or; the were holder relative to said guide brackets,- and-hears ro roc mg the said work holder to move thefeurvededgesof the sheets over and in engagement with "the grinding wheel.

13 m a machine for simultaneously grinding the curved edges of a plurality of-glass sheets orpl'ates; a was grinding wheel positioned to rotate about a substantially horizontal axis ia'ndhavinga plurality of grooves formed in: the periphery-"thereof; rnarisfor supporting the glass sheets to b efgjround on edge in a substantially vert cal position including a holder arranged abovefsaidgrmding wheel and comprising spaced verticalside members between which said sheets are'received and a plurality of horizontal rollers "carried byand arranged between said-side members' for maintaining the glass sheets in posidurin jgififidingjgsaid rollers being provided f with groovesin registry withthe grooves in the gr dingjwli'ee'l' within-which the edges of p do racketsiniounted-at oppositesides of the workholderandhaving vertieal guideways therefin blpfck's jslidably mounted; said guideways, ri qntal carried by' the side memoftliework holder and loosely reoeived with- "said blocks deflning-a horizontal axis about which s d w klha d r. s ad p d be 'jed',; and: iriean'sifcdnnected with said work 'hol'drjfor the same-about such "axis to have theeiirved edges, of the sheets over and in @112? m in with. the grinding wheel; 1 I

"1.4 in, a machine for-simultaneously grinding curvededgesoi la plurality of glass sheets 6171912; 5, a rotary grinding wheel positioned; to rotate about 'a"sub stant ially' horizontal axis, a workholdjer arrangedabovesaid wheel and adapt led'to support the'glass sheets to'be ground on 'ed'ge in'a substantially vertical'position, said work iliolfd'er including spaced :vertical side members between which saidlsheets are 'received-and-means carr ed] by and-arranged 'betw'eensaidside inembersfifor rnaintaining the fsaid sheets in 'posir19 1 .d in' i n ine m or Pivotally t ing" the workiholder about its "pivot to move the det sof the sheets '--over-and 'fen'gagemerit with thegrinding- "wheel, means for "guidmay-supporti g the said work holder for free vertical; movement during the I rocking thereof, said" rocking means inc -l'lidifig Substantially hori 'zemr-cennectmg rbaspivotally mounted at th'eir inner ends to opposite sides ortnework nmder, Wiiiszisrar reuproeatmg SaidCohhectiIigrbds tioned means including substantially horizontal eluding a motor and operative drive connections egglassjsheetsare-adapted tobe received, fixedcurvIed' edges of the sheets "over" and- --r-,98'z,oks4

including a motor operative drive connections between said motor and said. .1- q 1 v I 15. In a machine for simultaneously m the curved'edg'es'of a -plur'ality of glass sheets-"or o plates, a rotary grinding wheel positionedfto -ro- 51 5 tate about a substantially horizontal) axis and having a plurality of grooves formed in the periphery thereof, means for supporting'theglass sheets to be ground on edge ina substantially are received and a plurality of horizontal rollers carried by and arranged between said jsidei'nembers for maintaining the glass SIieets in pOeition during grinding, said rollers being provided with grooves in registry with 'thegrooves' -inthe g-rinding wheel and within whieh' the edges 0f the glass sheets are adapted to be received; guide brackets mounted: at opposite sides of-the work holder and having ver'tiealg'uideways there'- in; blocks slidably mounted iinsaid 'guideways,

horizontal trunnion's carriedby the side members of the work holder and lo'o'sely received said blocks defining a horizontal axis-about'wliich the said work holder is adapted tofb'e rocked, and means for rocking theworkfholder to mojve the curved edges of the {sheets overand ineng ag ement with the "grinding wheel, sa-id last-men'- J connecting rods pivotally' mounted at their inner ends to opposite sidesof' said work holden'and means for reciprocating said-connecting rods inbetween said motor and said rods; o 35 16. In a machine for simultaneously grinding the famed edges or a plurality 'ofglasssheets p a o a y ding wheel positioned to rotate about a substantially-horizontal"axis a work holder arranged above said wheer and 40 adapted to support theglas's' sheets to be ground on edge in a substantially vertical positiimgsaid workholder' including spaced vertical side-mermbers between which said-"sheets arereceivedand I jmeanscarried by andarrangedbetween said side members for maintainingrtlre said sheets-in postiti'o'n during'grinding; means for pivotally mount ing the workholder about its pivot to o t ate- 'ment with the grind ng wheel, guid fingly 'supportingthe "said work holder for free vertical movement during the said rocking 'm'eansyincluding substantially zontal connecting 'rodspivotally mofintedat tlreir inner ends tooppositefsidesof the worr s me, means for reoiprocatingsaid oonn'eiiting' rods eluding a, motor and operative drive conneotie'ins between Said motor arid staid od' sf'afldfmeans engageable'by theworkholfderjat'th omflienon o offth'e'grinding'eyeleiorfiraising saidwoi'kfhold in or 'to liftithe g'lass' 'sheet's out ofenga'gement the" grinding. wheel.

17. In a'machine forjsi'multaneouslygii" ding 'the curved"edge's 'fof fa p luralityfof'glass sl'iets or plates, a rotary' grindi'ng helipo'sitionedto rotateabout a substantiall horizontal akis' and 'havmg= a s1ur 1ay or groov 'rdnned mtme pe ripherythereoffmeansflfor summit g sheets to be groundon-"edge in a: vertical "position: including =a, -holder: arranged above said 'gr-indingwheat-and comprising vertical; "side members arereceived and a plural itw a: horizontal rollers ca Iri'ed-by and arran gd betwbn said 'sifle' ni'm b'e'rsfor maintain i'ng the glass 'sheets imposition M during grinding, said rollers being provided with grooves in registry with the grooves in the grinding wheel and within which the edges of the glass sheets are adapted to be received, fixed guide brackets mounted at opposite sides of the work holder and having vertical guideways therein, blocks slidably mounted in said guideways, horizontal trunnions carried by the side members of the work holder and loosely received within,

said blocks defining a horizontal axis about which the said work holder is adapted to be rocked, means for rocking the work holder to move the curved edges of the sheets over and in engagement with the grinding wheel, said last-mentioned means including substantially horizontal connecting rods pivotally mounted at their inner ends to opposite sides of said work holder, means for reciprocating said connecting rods including a motor and operative drive connections between said motor and said rods, and means engageable by the work holder at the completion of the.

grinding cycle for raising said work holder to lift the glass sheets out of engagement with the grinding wheel.

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 axis, a

work holder arranged above said wheel and,

to said guide brackets, means for rocking the said work holder to move the curved edges of the sheets over and in engagement with the grinding wheel, said rocking means including a motor and operative drive connections between the motor and work holder, and means actuated by said work holder at the completion of the grinding cycle to automatically shut off said motor and bring the work holder to a stop.

19. 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 and adapted to support the glass sheets to be ground on edge in a substantially vertical position, said work holder including spaced vertical sidemembers 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, fixed guide brackets mounted at opposite sides of the work holder and having vertical guideways therein, means carried by the side members of said work holder and slidably received within said guideways, said last-mentioned means being constructed to cause rocking movement of the work' holder relative to said guide brackets, means forrocking the said work holder to ,move the curved edges of the sheets over and in engagement with the grinding wheel, said rocking means including a motor and operative drive connectionsbetween' JOSEPH P. CROWLEY.

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