US1171028A

US1171028A - Machine for grinding the edges of lenses.

Info

Publication number: US1171028A
Application number: US79771513A
Authority: US
Inventors: Joseph H Cossman
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-10-28
Filing date: 1913-10-28
Publication date: 1916-02-08
Anticipated expiration: 1933-02-08

Description

J. H. CUSSMAN.

mam FUR mums IHE EDGES (2F LENSES.

M'PUOMwQN HLE!) 061. 28. .953.

1 q 1 7 l .028 lutentvd Feb. 8, 19K).

WITNESSES:

M Magm kit/M460 "(a g M.

ATTORNE Y.

J. Hv (IUSSNAN WACHINE FOR GRINDING Ht ROMS 0F mats,

APPLICAHON FILED OCT 2&5 141.,

Pzuentcd Feb. S, 19H;

5 SHKUS SHEEI 2.

IN VENTOH.

WITNESSES: $4M 44/. W41

J H. CUSSMAN.

MACHINE FOR cmwmws THE EDGES 0F LENSES.

APPLICATION HLE'U OCT. 28, 9X3.

Patented Feb. 8, 1916 5 SHEETS SHEET 5.

IN VENTGR.

WFNESSES:

' ATIMNEY.

UNITED STATES JOSEPH H. COSSMAN, OF NEW YORK, N. Y.

MACHINE FOR GRINDING THE EDG-ES OF LENSES.

Application filed October 28, 1913.

To all whom it may concern Be it known that I, Josnrn H. GossMAN, a citizen of the United States, 'residing at 'New York, in the county of New York and State of New York, have invented certain Improvements in -Machines for Grinding the Edges of Lenses, of which the following is a specification.

The objects of this invention are to enable a plurality of lens-holding means to be employed with a single grinding stone, each of which means can be operatedindependent of the others to grind lenses; to provide a series of such means at each end of the grinding-stone frame, at opposite pe-' tension for holding the lenses against the description.

stone which can be readily adjusted; to enable the lens-holding means to be tilted back and held away from the stone without releasing the tension; to discontinue the rotation of the lenses in any one of the lensholders simultaneously with said tilting back thereof; to provide for a second or further tilting back of each lens-holder, which also simultaneously releasesthe tension for holding the lenses against the stone; to suitably limit the amount of both such tiltings; to secure improved means for regulating the sizes to which lenses, may be ground, and indicating means therefor arranged convenient-- to the view of the operator; to secure strength andrigidity of construction, with simplicity of operation, and to obtain other advantages and results as may be brought out in the following Referring to the accompanying drawings, in which like numerals of reference indicate the same parts throughout the several views,

Specification of Letters Patent.

Patented Feb. 8,1916.

Serial No. 797,715.

grinding the'edges of lenses embodying my invention; Fig. 2 is a view looking toward the edge of the grinding stone and showing on larger scale one of the lenssupporting means which is viewed endwise in Fig. 1; Fig. 3 is a plan of said lenssupporting means; Fig. 4 is a sectional view taken on a plane through the axes of the swinging carriage and the lens-holder; Fig. 5 is a sectional view taken on line A-A of Fig. 2 looking in the direction of the arrows; Fig. 6 is an end view of a certain tension adjusting sleeve with thekey for operating the same; Fig. 7 shows a pattern which may be used in my improved machine to determine the shape of the-lenses; Fig. 8 shows in perspective a leienfor releasing the lens-carrier members from the lenses; Fig. 9 is a perspective "iew of a removable head which may be used in different sizes to engage the lenses to be ground; Fig. 10 is a sectional view of a certain gage for determining the size to which the lenses are ground. taken on line B-B of Fig. 3; Fig. 11 is a detail section on' line C-C, Fig. 4, illustrating a certain spring catch for holding the swinging carriage tipped back to insert or remove lenses, and Fig. 12 is a perspective View of a bearing bracket for the driving sprocket Wheel.

In said drawings, 1 indicates a

frame having bearings

2, 2 in which is journaled the shaft- 3 of a grinding stone 4., all of which parts may be of any ordinary and Wellknown construction. It will be understood that such stones are already in use, and upon the upper part of one end of the frame 1 is commonly supported means for grinding upon the stone the edges of lenses, which old means I have not shown in the drawings although a space is provided to receive the same at the left-hand end of the frame in Fig. l. 1

In carrying out my invention, I mount upon the frame 1 in such position as to leave proper space for the said grinding device heretofore employed, side pieces or stanchions 5, 6 which are firmly secured to the frame 1 and project upward therefrom on opposite sides of the grinding stone to support the various parts next to be described. Figure 1 IS a side elevation of a machine for Preferably, a narrow base plate 7 is secur-oil on top of the sit" ands away from the i near its o lpwnii. 8. 5), one of whicln as preferably or r with 'iliSlX and tho other bearing 9 having ontsiih tho manually turning it. l0 and slce r. 1'1 is moun a main shaft 33, and upon the outside of sa l, bushing and sleeve. as trunniijins, nnninte: a rocking or swinging carriagel-l. This i arriagi sists of a tliolllfii' portion in the c fis ot which receive said trunnions forinci'l by the bushing i and sleeve ll and. from ii'liich tubular portion projectlzpaa al longitudinallv

alined arms

16, 17 and 18 all of which priwidc. bearings at. their upper ends For the rotary'lei'is rarrie-ixi Said lcns carrier comprises alincd and poi-lions or meini'iers adapted to rlanip len o twcrn timin- Sl\' :l:', one of said in. nhnr. f iongitn-ili nally stationary and i-oznpr '13: 'a rotary spindle 19 mounted in the hearing of the arm 18 with its inner cod or and next the other member of the lcns Carrier receiving a plate J1 against. which the lenses 2-, each having on opposite sides of itself washcrs are adapted to be rlampcd. The outer end of the spindle 19, or ond away from 'thc'said plate-receiving end, rccoivesa gear-Wheel 24; moshing witha gear-whee} on the shaft 123, and the hub of this gear-wheel, in conjunction with a collar 20 on the spindle at tho opposite end of its bearing in the arm 18, holds the spindle against longitudinal displaircmont. The other end portion or mainhnr of the lens carrier comprises a. longitudinally slidable spindle 26, upon which is mountrd a bushing 27 adapted to rotate within thc bearings of the

arms

16 and 17. llotar motion is transmitted to thc bushing '27 in nu-ans of a grab 'hcol 3.8 last upon the outcr and thcrcoi adjacent the lirariug provided in the arm ll said geararhrcl 23 moshing with a "(!21F\\'ll(.tl ia t upon the main shaft 13. it is to bc unduixtood that those. g arnrhrcls 3-8 and 29 should have. the same. ratio our. to the othcr as do the rorresponding gcarovluwls ll and 25 upon the. oppositr. vnd of the. rarriaggcv ll, whereby the spindle H) and the bushing 27 are rotatasl at the. same rate. l urtln-rmorc. it may hurc. be notrd that it has bccn lonnd practii'aiblo nu dor sonic. (-iriannstancrs to omit entirely one sot of gi-ar-whri-ls H and 25 or 28 and 29 and drirc only by moans ol' the otlnu' sot, so that I do not wish to bc rostrir-tcd to use of tludouble drirc. shown.

llcturnin; to tho lrns rarrir-r bring; dc.- srribod. tho bushing 27 is proridrd at tho innrr sidioltho niiddlv arm 17 and its bearing with an \lll}ll' i l'l(i cud portion Ill) flll'llllllfi a sliouldrr to prcvi'nt iuorvnn-nt oi;

tho bu hing! 32 longitudinally out ard, andas the gear-wheel is secured onto said hashing adjacent to the r'lal ively opposite of ihe hearing in the other arm 1 aigitui'linal movement of the bushing i ierehy prevented inwardly. i

A collar 31 is fixed upon the hashing 27 adjacent the inner side of the hearing oi the. outer arm 16, and against this collar bears a helical spring 32 mounted on the bushing. Said spring bears at its othrrend against a collar 33 surrounding the bushing, the col lar llQlllg" provided with a. screw 34 in i ell projecting through a longitudinal slot 23a in the bushing and engaging in the spindle 2-6. B this construction, thcrcfore the 'ndlc may be longitudinally slid wi hin the bushing by virtue of the slot 35 and yet the screw 3 engaging the. sides of the slot transmits any rotary movement of the l n h ing to the spindle. Furtl'icrmore, the is. acrn "ion of the spring 32 under omnprcssioii imtwron the collar 31 fixed upon thr 101" Q tudinally stationary hashing :27 and the collar 3'33 fixed to the longitudinally slidable spindle 26 normally slides said spindle toward the other mcmher of the lens carrier so as to clamp the lenses against the cod thereof. Preferably, the collar 31 has, e. tending over the spring: a oylindriral. portion 36 adapted to 'iilcscopc with a similar sleeve 37 extending toward ittroi-n the other collar 33, and spaced from the buslr ing so as to admit said spring thcrehctwcen. 'lhia. inncr end of the spindle 26, just beyond thc said bushing :37, is provided with a. H: movable head or tip 38, said head preferahly having an enlarged bearing surface tarcd with some material surh as rubber as shown at 9 in the drawings, to engage the lenses. In order to remorably srcurc the said ln-ad 138 to the spindle to rotate thcri with. it screw-tilrcadcd on its roduocd cud ll? and adapted to be screwed into an apprir priato threaded hole in the end of the spindlv, and to be rcmovcd thcrelrom whcn tln lcns rarrior sections arr separator! by sliding the spindle 2h outward as has lawn nn-utionciL- [leads of dill'crcnt lcngths arr protcrably provided for grinding dill'crc-nt numbers oi lenses at a time. The tendrnoy of tho spring 32 already described is to l'urco said spindle. 26 and its head 38 toward 'tlni longitudinally stationary spindlo 19, wherehr lcnscs are clampcd thcrcbatwciai for grinding, as shown. in order to slide said spindlr within its bushing 27 against this artion of tho spring 32, so as to insert or ro morc lcnscs, I provide a lever, shown in Fig. 8 in detail, pivotcd as at 41, sci: Fig. 2, to the middle arm 17 and adaptcd to cngago tlfr rollar 33 on the spindlc 20 and slidc said spindlc. outward as dvsirrd. laid liw'iir izoinpriscs a. pair of parallul ('aiu plains l2, tho ram rdg'vs of which arr: proridod with lll\\'2ll(ll (lll'ltllil llangi-s-lil. lIl l'oz rugagenient against the collar 33 already de scribed on the spindle 26 to slide said spin die. A handle H joining the said

cam plates

42, 42 above the spindle 26 is aranged so as to rotate said cams about the pivotal points l1. l1, said handle preferably lying tlatwise along the lens carrier when the same is rotating and projecting upward when the lever is thrown into rcleasing position.

In order to swing the carriage toward and from the stone to grind the lenses to elliptic shape, I provide a pattern -15 adapted to be removably supported upon an end extension 46 of thebushing 27. (See Figs. 4 and 7.) Pins 47 projecting longitudinally of said bushing from its enlarged end porshown with a knurled periphery for the convenient manipulation thereof. As the spindle 26 is rotated, it necessarily rotates the bushing, whereby the pattern revolves it being noted that the same is arranged perpendicular to the axis of such rotation. It is to be understood, also, that the plate 21 upon the spindle 19 is preferably removable and provided with holes to receive pins projecting from said spindle, whereby said plate, which is elliptical, can be placed in position on said pins with its major axis parallel to the major axis of the pattern when held upon its pins 47. By such arrangement the accurate and ready insertion of the lenses in relation to the pattern is facilitated, since they need only be placed in the desired relation to the plate 21 in making up a stack to put into the machine for grinding.

The pattern 45 bears against a gage (see Fig. 10) adjustably supported by the bed plate 7. said gage comprising an upwardly extending arm 51. faced near its top with a plate 52. preferably of high resistance to abrasion. for the pattern to bear against, and having a horizontally disposed base or foot 53 longitudinally slidable within a tubular guideway 54 on the under side of said plate '7 or otherwise suit-ably supported. This foot it will be understood. lies trans versely of the swinging carrier, beneath the same. with its arm 51 reaching upward adjacent to the grinding stone. on the opposite side of the carriage from the operator. and

held against tipping sidewise by lying in a recess 55 of the face plate 7 between

cheek pieces

56, 56 extending preferably both up and down from said plate, as shown. Said foot is bored longitudinally as at 57 and interiorly threaded to receive a screw 58 having at the front side of the machine areduced shank 55) and hand-wheel (30 for turning. see Fig. 10. A collar ()1 loose. on the reduceil shank 59 and held against move ment by a screw 2 projecting through the lower wall of the guideway Bl. lies betweeiii. the threaded portion of the screw and a pinion oil fast on the reduced shank 59, so that the screw is held against longitudinal movement. Thus by turning the screw the foot 53 and its arm 51 will be moved with respect to the base plate 7 and pattern 43 to vary the size to which the lenses are to be ground. The pinion 63 engages a rack 3-1 arranged to slide in a slot 65 cut in the front of a portion ()6 of the base plate 7 which projects forwardly therefrom for its middle portion and extends downward as far as the under wall of the guideway 54 for the foot 53 of the gage, as shown in Figs. 2. 3 and 10, and thus as the gage is adjusted by turning the screw, the said rack 64 is slid. A front plate 67 is secured upon the upright front face of the projecting portion (36 of the base plate 7 to cover the front end of the slideway 54 around the reduced shank 59 and also to inclose the rack 61 in its slideway. This front plate 67 is slotted longitudinally to af ow an index finger 68 to pro ject from the rack 64 and upon the upper part of the plate 67 a suitable scale 69 marked to indicate to the operator the move ment of the gage. Thus by looking at said scale 6.), the operator may set the gage with respect to the pattern 45 so as to grind lenses to any size, said scale being conveniently observed by him as his fingers turn the wheel (30 of the screw.

Attention is again directed to the fact that the elliptic grinding is due to the pattern 43 engaging against the gage. the entire earriage swinging or oscillating-about its axis formed by the bushing 10 and sleeve 1i within the lower tubular portion 15. and in order to press the lenses against the stone. or the pattern against its gage, a helical spring 70 is coiled around the shaft l?) with-- in the lower tubular portion iii of the carriage ll and attached at one end to the can riage. as by screws 71. and at its other end to the sleeve 11. as at 72. It will be remenr bered that the sleeve 11 can be turned by the wheel 12. and the desired degree of tension L of spring 70 is thus obtained by rotating the sleeve 11. For conveniently turning this wheel 12 to increase the tension in the spring T0, without endangering the operator's hands by proximity to the gears 24. 25. I provide upon the side piece 5 an up wardly projecting ear T3 adjarent the wheel 12, apertured as at T l longitudinally parallel to the sleeve 11 for receiving the end of a key rod carrying a gear-wheel To which wi l with the toothod periphery of when? wt whoa. tlic in rod is so inserted in l ne was: 1'3. hool 77 at the outer o. f said roC if provides suitable meal f r iWlSilUg sriol goarwhoel To and than turning tho wlnrol on the sioovo. 'ihia licy may l oniado nonremovable or per manontly liclzl hy the ear 73 if so dean-ed ha! i prof r to hair it rianovahlo whorcby hrunod on any our: of the s. 'itod pawl it. pivotal he- :.'l'.;*l N and tho bra ing J, as atlo, so: z an in and engaging; ratchet iooih l n the adiarr-nt law of tho wheel 1&2 normally rciaina the apring 70 against anvciirling. but nzay ho manuaily operated to said apri" r tonssion cntirii-ly when for awir'. i'lircarriage hack into dillilli iihcn t (ll-sired suhsc- 'illll'lll to re -apply tho tcnsion of the spring, the low inyornal and wound upon to create tho di-airad pronoun to hold the lonsos to the atom: and the patiorn to itr; gage. This adjustability of pri sure of the lenses against tho stone import-int in the production of lonscs aoouratcly ground, borauso since va-- rious lldllilltlin of looses may ho ground at a limo iirorrrsponilingly varying; prcssurcs will he rei nircd at dilfcront times.

When it i:-; drsirod to merely insert, romovo or othorwisc. manipulate the lenses in tho oarrirr. it is proforahln not to have to rrhrasa tho lr-uaion in said spring 70. it talo in: time to rvailiuzt it. For this reason l proi'idc a1 a coni'ouicnt place. such as on th undoiv ide of tlntubular portion 15 of tho a: riagc. are l iga. l and ll. a dopending and arranged tramworsoly of the all as o paws upwa d toward said :i hart --pring 3 projecting outward non! of m d. pialo T coni'cnicnt for aiiklllzll oprraiioo iiuid loal' apring is pro- -=idod with a :Iiilai.- r aga-rtltro Hi to rccciio no; lll li liill lj pin from tho varriagc and Ho pohitioniai as to admit tho pin whoa the airiagzo r owing away from tho grinding sl nc tho roi-ilirnoy of thc loaf spring onu'aging it autoniatioally. This cngau'onu-nt occur whun tho carriage is suthriontly iiltcd, and rotains said carriago in such position against the tcnsion of the helical Spring Til until the loaf spring 83 is dcsprcsnod out of oiigagoinuit with tho pin if, when tho carriage is hold in this tillrd position from tho stouc. thc loaf spring 83 he. dcprrh'scd and tho carriago tilted farthcr ba k, a lag 3 propling radially outward from tho tubular portion 13 thcroofi sorl igrs. 2, ll and ii. cnnagca tho froo vnd of the pawl 78 fo tho lrusion hm-l l2, dcproasing tho soon so that its othrr and is raiar-d out of cngapfclnonl. Willi tlic rah-hot tooth Hi of said whcvl. lhoroin' -rlcasinn thr lcuxion of the to remain tilted 1d y away from the grinding stone, a stop 86 being provided on the may be any suitablev train-of gearing, but in tho drawings. and especially Figs. 1 to 4 thereof, a chain 88 from the shaft 3 of the grinding, stono shown adapted to transmit rotary motion to a sprocket wheel 89 mounted loose upon the end next adjacent to the grinding stone of a counter-shaft 90 parallel to said grinding stone shaft at the side of the swinging carriage l-l next the grinding stonc. This counter-shaft 90 may be sup ported in any suitable manner upon the side piece or stanchion 5 in transverse relation thereto. but prefer to employ the su )porting moans shown herein and next to lJQ described. A plate 91 is secured on top of the side piece 5 so as to project horizontally outward away from the other side piece 6, the side piece 5 being recessed to a depth equal to tho thiirlinoss of this plate 91 to receive the same and also having a hraoket 92 extending beneath the plate 91. Screws 93 then secure the plate firmly in position. Dircctly above the side piece the plate 91 extends forwardly beneath the base plate 7 to the depending portion 66 thereof at its front edge, and the plate l l also has an upwardly extending flange 94 parallel to the side plate 5, hut at such a distance therefrom as brings it in lino w ith tho laiaring 8 of the base plat 7. the said llangc abutting the edge of said hearing: ncxt {hr i in? atone. The countcr shaft 90 has onc of in: hearings 95 in this llangc ill and another bearing Elli in alinincur. therewith to the opposite aide of the plate Hi, all as clearly shown in Fig. 3. The HEHKH'lx'QlJ whorl 89 on tho said counter-sl1aft H0 is at the aid: of tho bearings-i 95, 96 just mcntioncd toward tho grinding stone. and to support thc cud of said countonsliaft 90 betwoon said .aprockct and the grindin stone I employ a hrackct S)? shown in dctail perspcctive in Fig.5. 1'), which is bolted to the innor side of tho sido picco or stanohion as ohown in Fig. t. This bracket 97 comprises a foot 98 which is bolted to the side-piece 5 and a horizontal body portion 9 which cxtonds boncath the sprocket wheel 89, and an upright arm 100 at tho 0nd of said body porlion bcyond tho sprockrt whccl which ariu proridcs at its top licaring 101 for thcoud of tho shaf. no. Furthcrinore. the body portion W? has proiortiug from itsclf toward the grinding atonr a guiding irough which ILtt'lWr; tho chain SH for a little distance adiai-cnl to tho xprra'lirt whorl and prcrcuts its engagement with the sprocket wheel from being disturbed by the shifting of the grinding stone longitudinally of its axes which shifting is common in this class of machinery and pertains to the grinding stone so that it is not shown herein. A sprocket wheel 103 fast with respect to the sprocket wheel 89 receives a chain 104 to drive the lens supporting means next above by means of its driving sprocket 105. Upon the outer end of the said counter-shaft 90 is a pinion 106 adapted to mesh with a gear-wheel 107 mounted on a stud 108 projecting from the flange 94 of the plate '91 and carrying a pinion 109 fixed to the gear wheel 107, said pinion meshing with a gear-wheel 110 on a second stud 111 on the plate flange 94 and which gear-wheel 110 meshes with a gearwheel 87 on the main shaft 13 of the carriage. A clutch 112 is provided upon the counter-shaft 90 between its bearings 95 and 96 one member 113 of which is formed on the hub of the sprocket wheel 89 and the other member 114 of which is slidably keyed to the counter-shaft. Thus by throwing this sliding clutch member 114 into and out of engagement, the lens carrier will be rotated or stopped, as desired, it being understood that the sprocket wheel 89 rotates continually. In this way, each lens supporting means can be operated from its sprocket wheel independent of whether the other lens supporting means are being operated by their sprocket wheels and without regardto how' many lens supporting means, area-pplied to a single grinding wheel?" In order to automatically throw this clutch in and out, I preferably provide 'a'shift arm or lever 115 pivoted to spring horizontally upona pin 116 projecting upwardly from the plate 91, see Fig. 3, and forked at one end to engage between collars 117, 117 on the'clutch member 114. The other end of this shift arm or lever 115 projects under the swinging carriage 14, where it is provided with a transversely oblique or inclined slot 118 which receives a pin 119 depending from the under side of the carriage, through a slot 120 in the base plate 7 at right an les to the length thereof. Preferably

extensions

121, 121 are formed at the ends of the oblique slot 118 in the lever 115, longitudinally thereof, to allow for any further travel of the pin 119 after the clutch has been' operated. As the carriage is swung or tilted away from the grinding stone, the pin 119 travels in the le ver slot and striking the oblique portion 118 thereof swings the lever sidcwise and shifts the slidable clutch member 114 out of engagement with the other member 113.

It will he understood that the position of the oblique slot 118 is such that when the swinging carriage is tilted away from the grinding stone to its first position, that is witli the pin 77 in the hole of the spring 754 and the tension spring 66 in'full force, the clutch member 114 will be thrown out, and that as the swinging carriage is returned to operative grinding position by releasing the spring 78, the said clutch will be again thrown in. carriage is tilted away from the stone so as to no longer grind the lenses, the rotation of the lens carrier is automatically discontinued, and tilting t-he'carria-g e toward the stone again simultaneously starts the lens carrier to rotate. Obviously, the slot 120 in the base plate 7 guides the end of the pin 119 and supports it against any lateral bending or deflection as it presses against the lever 115 to swing the'same.

The lens supporting'mea-ns which I have described is shown elevated above the frame 1 of the grinding machine, by the side pieces or stanchions 5,6, so that it will not interfere with the old forms of supporting means now upon grinding machines, but will lie above the same. When so desired these side pieces 5, 6 may be surmounted by a second vpair of side pieces 122 carrying a lens-sup porting means 123 similar to the one above described and positioned immediately above the same, see 'Fig. 1. This second lens-su' porting means is preferably driven by tl ie chain 7 104 from the sprocket 103 on the counter-shaft 90 of the first or next lower lens-supporting means, preferably next adjacent to the driving sprocket 89, as already described, whereby economy of space on the axle 3 of the grinding stone is effected by necessitating only the one drive therefrom to operate the series of lens-supporting means. It -will be understood that still another or third lens-supporting means 124 may be applied over the others, see Fig. 1, and indeed the number of lens-supporting means in the series is limited only by the size of the grinding stone or dem-ands'of the user.

It is to be noted that as herein used the In this way, therefore, as the term lens supporting means is that portion of the device other than the side pieces 5, 6 and the driving means, said driving means including the tram of gears from the gea r wheel 87 on the shaft 13 to the pinion 106, together with the counter shaft 90, the clutch 112 withits shifting lever andthe driving sprockets and chains. It is to' be understood, however, that in superposing the lens supporting means one above the other, suitable side pieces and driving means are provided for each of said lenssupporting means. In operation, the several sprocket wheels are run continuously, but the lens supporting means is only operated when desired, so that one of said supporting means may be operating to grind lenses while another one is being attended by the operator, and so forth.

Preferably the engaging edges of the side pieces or stanchions of the different lenssupporting means are disposed in lines which pass through the axle 3 of the grind in stone, as shown pz'irticularly in Fig. 1, mil arrangement resulting in the same disposition of the various parts of the ditl'erent lens-sopporting means with reference to the per pheral surface of the grinding stone. Furtl'iermore, I, prefer to mount upon the opposite end of the frame 1 of the grinding stone, at second series of lens-supporting means extending upward therefrom as indicated in Fig. 1. This series mightbe exactly like the series which has been already described, but since it has not been customary in practice to employ; more than one lens supporting means with a grinding stone, it is usually donecessary to .provide a the second end of the grinding stone space for a lens-supporting means already in use, as l have shown and described at the first end of the frame. I therefore have shown one of my improved lens-supporting means. as 12-5, with sup iiortingside pieces or stanchions 126 which are low and merely strips secured to the frame 1. Then by side pieces 127, extending up from these strips 126, I support a next higher lens-supporting means 128, and above that another one 12-?) supg mrted b v side pieces 130. In this way, a series of len supporting means may be provided at this end of the griudin machine, their coi'ist-ruc tion and operation. being similar to that described in coni'iection with those at the front. end of the machine. The series at this sec end end of the machine may, like the first, be extended upward as far as desired, and thus a large number of lens supporting means secured in connection with a single grinding stone. Because of the compact arrangement of all the lens-supporting means upon the one grinding machine or' stone, it is easy for a single operator to tend them all and much space as well as cost of installation is saved. \Vhile the operator re: moving or arranging the lenses in one of the supporting means, the lenses in others of said supporting-means may be grinding, it. being thus made possible to grind a large number of lenses at one time. hloreover, since each lens-supporting means of my in" proved machine :an be set or adjusted inde pendent of the rest, a plurality of lots oi lenses of different shapes or sizes can be ground at the same time, and on the same. grinding stone. Also since there is a series of lens-supporting means, by my invent on, different ones may be kept set to grind different standard sizes or shapes of lenses and thus the machine is, always ready to grind any of those sizes or shapes Without adjustment. 7

Having thus described the invention, what I claim is.

1. In a machine of the character described,

the. combination with a grinding stone, of lens suppmrting means adapted to present lenses to said griin'ling stone, a second lens supporting means mounted upon thefirstmentioned lens supporting means and adapted to present lenses to a different portion of the periphery of id grinding stone at sub stautiallv tlu r angle thereto as said -meutio1c. supporting means presenrs its lens s. driving connections lor operating the first-mentioned lens supporting means from the grinding stone, and other driving connections for operating the said second lens sup mrting means from said ti rst ennui ioncd dri ring l'zoin'iections.

.ln a machine of the character described, the combination with a grinding stone, of lens auipporting means adapted to present lenses to said grinding stone, a second lens supporting means mounted upon. the'firstmentioned lens supporting means and adapted to present lenses to a different portion of the periphery of said grinding stone at substamiall the same angle, driving conned Lions operating the first-mentionedlens supporting means from the grinding stone, other driving connections for operating the said second lens supporting means from said llIStdiltiitliillfitl driving connections, and a clutch in one of said driving connections at a point i .ther an ay from the] grinding stone than the union of the two driving connections. v

3. In a machine of the character described, the combination with a substantially horizontal el ated trams and a grinding stone mounted 1e ein, side pieces mounted at one end of s l frame on opposite sides of said grinding stones in planes sul'istantially parallel therewith, the top and bottom edges of each of said side pieces being inclined to each other, a second pair of side pieces upon said first mentioned side pieces having their top and bottom edges inclined to each other, and lens supporting means lJQtWBQIl corresponding pairs of side pieces adapted to present lenses to the periphery of said grinding stone.

1. in a machine of the character described, the combination with a frame and, a grindstone having" an axle mounted in said r o'" Side pi s mounted on said frame 'iposite Side, of said grinding stone, :1 it; carried hi said side pieces substan- -ll parallel to said axle, a carriage mounted to swing on said shaft providing a rotary lens carrier adapted to be rotated by said shat't and present lenses to the grinding stone, a. counter shaft mounted on one of said side pieces substantially parallel to saidand carriage {shaft between the two, means tor driving sa d carriage shaft from the counter shaft, a sprocket rotatably loose on said counter shaft, means for driving the sprocket from the axle, and clutch means for-- connectin said sprocket and counter shaft as desired In a machine of the character described, the combination with a frame and. a grimling stone having an axle for mounting said grinding stone in said frame, of a lens sup- 'iorting means, a sprocket wheel therefor, a sprocket wheel on said axle, a chain connecting said sprockets, and a guiding trough for said chain for ineventing dislodgment of said chain from its sprockets.

6. In a Inachine of the character described, a lens supporting means comprising a base, a swinging carriage mounted on said base, a lens carrier journaled in said carriage, a helical spring arranged longitiulinally of the line of hinging said carriage adapted when tightened to swing the carriage in one direction, and means for automatically 1e leasing said spring by swinging the carriage in the other direction.

7. In amachine of the character described, a lens supporting means comprising a base,

,a swinging carriage mounted on said base,

a lens carrier journaled in said carriage, a helical spring arranged longitudinally oi the line of hinging of said carriage. means for tightening said spring, and a detent for said tightening means adapted to be. released by engagement of the carriage when swung.

8. In a machine of the character described, a lens supporting means comprising a base. a swinging carriage mounted on said base, a lens carrier journaled in said carriage, a helical spring arranged longitudinally of the line of hinging of said carriage, a ratchet wheel for tightening said spring, and a spring controlled pawl normally engaging said ratchet wheel and adapted to be re leased by the carriage when swung.

9. In a machine of the character described, the combination with a swinging carriage providing alined bearings, of a member rotatablymounted in one of said bearings, a longitudinally stationary bushing in alineinent with said member adapted to rotate, gear wheels fast upon the outer ends of the member and bushing, a shaft for driving said gear wheels in unison, a pattern on the inner end of said bushing, a spindle slidably mounted in said bushing adapted to clamp lenses between itself and said member, and means for preventing angular displacement between said spindle and bushing.

10.111 a machine of the c'liaracter described, the combination with a swinging carriage providing aliued bearings. of a member rotatably mounted in one of said earings. a longitudinally stationary busliing in alinement with said member adapted mimic wliecls fast upon the outer ends of the member and bushing. a shaft tor 'vinpi said gear wheels in unison. a pat tern on the inner end of said bushing, a

spindle slidably mounted in said bushing, a collar slidably mounted on said bushing. means connecting said spindle and collar to slide together and prevent rotation thereof with respect to the bushing. and a spring on said bushing normally pressing the collar and spindle toward said member.

11. In a machine of the character described, the combination with a swinging carriage providing alined bearings, ot a member rotatably mounted in one of said bearings, a longitudinally stationary bushing in alinement with said member adapted to rotate, ear wheels fast upon the outer ends of the member and bushing. a shaft for driving said gear wheels in unison. a pattern on the inner end of said bushing, a spindle slidably mounted in said bushing, a collar slidably mounted on said bushing, means connecting said spindle and collar to slide together and prevent rotation thereof with respect to the bushing. a spring on said bushing normally pressing the collar and spindle toward said member, and a cam adapted to engage the opposite side of said collar for sliding said spindle within said bushing away from said member.

12. In a machine of the character described, a grinding stone. a lens supporting means adjacent said grinding stone comprising a base, a swinging carriage mounted on said base adapted to be swung toward the grinding stone in operative position or swung away from said stone into idle position or tilted partially between its operative and idle position into a middle position. and means for stopping and holding said swing ing carriage in its middle position when swung thereto from either of its other positions.

13. In a machine of the character described, a lens supporting means comprising a base, a swinging carriage mounted on said base, a lens carrier journaled in said carriage and having a pin projecting toward the base, and a leaf spring mounted on said, base normally eirgaging said can riage and having an aperture adapted to receive said pin.

14. In a machine of the character described, a lens supporting means comprising a base, a swinging carriage mounted on said base, and having a radially projecting pin depending therefrom, a lens carrier journaled in said carriage, means for rotating said lens carrier including a clutch, and a clutch lever fulcrumcd in fixed relation to said base and having an end projecting between said base and carriage and having a slot inclined to the plane of rotation of the pin and receiving said pin so as to swing the lever by swinging the carriage.

15. in a machine of the character described, a lens supporting means comprising a base having a slot therein, a swinging car iage mounted on said base and having a pin depending therefrom and projecting into said ,sbt, a lens carrier journaied in said carriage; means for rotating said lens cgrrier including a clutch, and a clutch lever .f ulcrllnied with its end projecting bemoan said bang and oarringe and having a slot indined to the plane of rotation of H10 pin and receiving said pin so to Swing tin;