US2435320A

US2435320A - Eyeglass lens grinding apparatus

Info

Publication number: US2435320A
Application number: US666314A
Authority: US
Inventors: Leopold H Metzger; Wilson B Muse
Original assignee: Super Cut Inc
Current assignee: Super Cut Inc
Priority date: 1946-05-01
Filing date: 1946-05-01
Publication date: 1948-02-03
Anticipated expiration: 1965-02-03

Description

Feb. 3, 1948. H. METZGER Err AL 2,435,320

EYEGLASS LENS GRINDING APPARATUS Filed May l, 1946 2 sheets-shea 1 Feb. 3, 1948. 1 H. METzGER Er -AL 2,435,320

' EYEGLAss LENS GRINDING'APPARATUS 2 Sheets-Shee 2 l Filed May l, 1946 Patented Feb. 3, 1948 UNITED STATES:` PATENT OFFICE 11 claims. w1.' 51.1345) The present invention relates generally to apparatus for use in grinding eyeglass lenses. More particularly the invention relates to that type of eyeglass lens grinding apparatus which as its principal components or parts comprises (1) a base structure which carries an electric motor and is supported in an elevated position by way of a table, bench or other support; (2) a vertically extending spindle which is mounted by way of anti-friction bearings on the base structure to rotate about its axis, has a driving connection.

between it and the armature of the motor whereby it is driven in connection with operation of the motor, and embodies an upwardly tapered upper end; and (3) a rigid horizontally disposed wheel which embodies in the hub portion thereof an upwardly tapered open bottom socket whereby it may be mounted removably on, and connected for friction drive by, the upwardly tapered upper end of the spindle, has the upper end surface thereof curved and provided with abrasive particles, and is adapted while being driven by the spindle in connection with a lens grinding operation to have a lens blank pressed against its upper end surface in order that the blank is ground by the abrasive particles to a curvature corresponding to that of the upper surface of the wheel.

In grinding a lens blank with an apparatus of the aforementioned type the blank is first rough ground by way of a wheel having coarse abrasive particles, is then ground by way of a grinding wheel having iner abrasive particles,

and is then provided with a so-called nish"V grind by way of a wheel having still iiner abrasive particles. vIn order to subject the lens blank to the three separate and independent grinding operations it is necessary successively to mount the 'grinding wheels on the power driven spindle. This requires for each successive grinding operation stopping the apparatus and thenv removing one grinding wheel and replacing such wheel with another grinding wheel. In practice it has been found that time is consumed and diiliculty is e11-V countered in removing a grinding wheel preparatory to replacement thereof by another wheel due to the fact that the friction drive between the wheel and spindle is generally so tighter secure that it is necessary in connection with a wheel removing operation to stop the apparatus and then break the friction drive between the wheel and the spindle by tapping the wheel in an upward direction by a hammer or like tool.

The primary obj ect of the invention is to provide an eyeglass lens grinding apparatus which is an improvement upon, and eliminates the dis- 2 advantages and detections of, conventional apparatus by reason of the fact that it embodies as a part thereof a simple and novel device wherebyv at the end of any lens blank grinding operation the grinding wheel on the upwardly tapered upper end of the power driven spindle may be quickly and readily raised a slight distance with respect to the spindle inorder to break the fric-l tion drive between the wheel and the spindle and thus release the wheel so that it may be removed from the spindle without the use of a hammer or similar tool. Y

Another object of the invention is to provide an eyeglass lens grinding apparatus of the last mentioned character in'which the device for separatlng or raising the grinding wheel with respect to the spindle at the conclusion of a grinding operation and preparatory to replacement of the wheel by another wheel for further grinding of the lens blank being ground,V comprises a lever which is mounted for vertical swinging movement and has at one end thereof means operative in response to swinging movement of the lever in one direction to engage the grinding wheel with sufficient pressure to break the friction drive and raise the wheel a comparatively small distancewith respect to the spindle.

Another object of the invention is to provide an veyeglass lens grinding apparatus of the type and character under consideration in which the lever.

i o f the wheel removing device has limited vertical f swinging movement in both directions and the 4'wheel engaging and raising means of the device is V adjustable in order to-control or selectively determine or vary the amount of raising of the wheel with respect to the spindle when the lever swung to its full extent in the proper direction for eiecting removal of the wheel.

Another object of the invention is to provide an eyeglass lens grinding apparatus of the last mentioned type and character in which the lever of the device is in .the form of a foot actuated treadle and the wheel engaging and raising means of the device embodiesv a rod lwhich extends through a longitudinal bore inthe power driven spindle of the apparatus and is adapted when intended prposealnd isy characterized 'by the fact that it may be operated expeditiously -arid with f acility.

Other objects of the invention and the various;

advantages and characteristics of the. present.. y d

''tre' I# into" the" central lower portion of the eyeglass lens grinding apparatus" will beappart' from a consideration of thetfollivirlg.-detailed@ description. l .K The invention consists in theiseveral'-litt/telef@a;v

more particularly dened by claims atY clusion hereof. n In the drawings which accompany and form apart of this speciiit'zatiflny or disclosure andi-rr Figure 1 is .-vertical longitudinal section of an eyeglass lens grinding apparatus embodying the` invention;

Figure 2 is a fragmentary front-view illustrate ingi'n detail the construction! and desigr'r orf the device for raising the grinding' wheel witllrespect to the spindle iri-orderto break the triatlondrive between 'thewheel and tliespindl preparatoryV to removal or the wheel for purposes et replace'- rient or substitutidr'ia'd l y 5 Figure 3 is' 'enlarj scti'ntaken onhe line -3--1-'3 of Figure 1- nd -sl'wiiig 'the marine in which' the' rod of theY wheel removing ydeiiee eir-v tends through the longitudinal bere the spindle of the apparatus andV serves iricorlectior'i with upward shift-thereof tfliaise the 'wh-'eela slight"- distarice with resp-eet "to V the vspindle ,and also` showing' the manner iiiwliicli the brake iiiear'i'sl` that associated wltli the wlieelrinovliig device oberstes connection wi'tli actuation df 'triedeviceto brake tnespiiidle. p g

'The' apparatus which isushown the" drawings constitutes the preferred foi i' `eliloo clifniQlit';of

the invention. It is essentially designedA f'r erin-d'ingtp. a predetermined curvature elfe` glass lens blank 5" and as it prin-cipal' parts 'corrie prises s, basefst'ructurec, a wlsliaped receptaclel 1, a vertically extending sii et, a grinding' wheel 9, a. pressure eiiertirigsriii l0 and a device ll rer use irl effec'tiii 'eijncval ofthe grinding wheel '9 when' it isdesi d to substitute another wheel for it in connection with lens blank grinding operation: i" y The bass 'structure s positioned or mounted on a table I2 iii.` "l'tllat 'it is rS'lllIOI't'ed at a suitable-insight abete the ricerca which the 'table rests. It isliorizbiitallyelo ted and embodies a; ridrizontal tp wall Yi[7g/fand 'a continuousde: pending side wall lll-. Tnetop wall I3 rennes with the dependigside wall it open sottoincoiiipartment #Band has 'at one eii'dptliereof an ist ralilijpstan-ding arirdla aange-'ld thsupper margin of lisrsliaped td'fdrni seat-11;. f

The receptacle 1 surrunds'fand serves Vas* ashi'el'd for the grinding-.wheel V9 during a lens blank grinding operation and. consists 'of `a cire I cular bottom wall anti-l cylindrical side' wall which` is connected-to and `"extends upwards from the outer marginal portiorlyofY the bottom virali` Such marginal portion of thebottom wall.v of the thereof extends vertically; A vconventional switchj (not shown) serves'to'tcontrol. the motor.` Itais an'tly stop" drive of thev spindle 8. The belt arl-dfV flange I6. As shown in Figure 1 of the drawings the bottom wall of the receptacle I has a centrally disposed circular aperture I8. The receptacle i's removable from the base structure 6 in order that it may be cleaned.

The vertically extending spindle has the central portion' thereof'vjournalled irlanti-friction bearingsvv I9 ori the top' Walll of the base structure 6 and is arranged so that the lower end thereof projects into the compartment I5 and its upper end. projects upwards through the -circular aper- .interor of the', receptacle 1. As shown in Figure lJ3-the'bearingsilvre so arranged and designed tures which are hereinafter setyfortll andl are the? C011 Y tlafftly hot'orlly' support the spindle for rotatien- V aboutits;axis but also hold the spindle y against` axial displacement relatively to the top wall'fo the base structure 6. An electric motor 20 serves to drive thefspindle 8 through the mediu-mof albeltand pulley connection 2|. Such motor ismounted ongthe lenclfof the top wall I3" that is opposite theiupstan'ding annular flange I6,-

arid -isJ-arrangedsothat the armature shaft contemplatd'- that afterveach lens blank grinding.-

operation 'thezs'witchA will be shifted into its open.

position in order to stop they motor and resulta pulleyconnectiorizzl isv located in the open bot#v tomf compartment I5 and includes a pulley (not shown) .onf the lbWeriendf-or the armature shaftv of the-matorrales; pulley 22f'on the' `lower end 'of receptacley rests on; ancla'is4 shaped conformably two'pulleys. Preferably the electric motor 'Ellis afconstant speed motorandserves in rc@inflection With the belty and illeyconnection 2l to drive7 the'spindle-sat-aspeed in excess df 1000 R. P. M.

i The spindle' 8 lla'sits upper lend tapered upwards? to a 'small degree. as shown vin Figure 3, and eni-` bou es a centrally disposed. longitudinally sxter'id-YL ingbor 24;. Thela'tt'er is preierabl'y' of' urliforn-i diam er 'f-rsliig grid-te end and extends tlireiiglltrie 'r and lower end surface of the spindle,

member' is ltcatedbsiiesth 'the pulley 2f2 sfjtlisv telt and pulley dri-ving connection 2l and siennes;

'l afiinternal 'upwardly tapered or: frusto-conical scc-liet* et; tris upper eri-il' for which communicates tutti.v trie lower edd sf the ldngitudinally extend-1 ingm leere z lliii 'triespludle-B. y Y* 'l.'- li=e"grirrcllingwheel 9 serves in connection with use-ercperatidd di 'the apparatus te grind 'tile ler-isolani; ics-'tiled'es'irsd curvature and somprisesja circular' ordiscL-like body 2l and a hun 2t. rt isZjiiriiis-lly located within die cen-usi low poit'l'rthe interior 'off the recer'ltaleX'I` an 2`l therefor-1 egtends'- liorlzontally.` -P'rsff'erably' tire todi arrdiiubgoff tire wheel are Afer'iriec'l integrally urithjfone'anotheriy lrass, Vbror'iz'e 'or y'any 'other sjuitaltiepmetaris used te fermfthe -wl'ieel vand die latterisp'refer-Y ri thejferrno astirig'. The upper .surfaced *Y the body' 2'Ifo 'the grinding wheel'iscurved cnforniably to theeiiryature that is"de`siredto befoin'red in the lens blank 5; If tll' lens Elan-k' is to be ground in a 'concave' fas-nien tli'epper end s rfacejof` the 'Wheel 'body 2T is cn'vex' as .,sllinffi'rl thetirawi'ng. YIf tll'e'lens' blank to .be .g'roi'n'sd as tchate aconvex 'surfacelte'worlirig/ Sdr upper. end surface df' the wlaeeibodyis adeso tha s-concavb ordislid.

Vsaid upper endsurface df "trie wlisl" Body is 'cdv'-V ered with abrasive particles which are embedded' blank 5 the abrasive particles are coarse, whereas v if the wheel is to be used for an intermediate or so-called finish grinding operation the abrasive particles on the upper end surface of the body of the Wheel are of ne mesh. The abrasive par`4 ticles may extend throughout the entire area of the upper end surface of the outer body and are uniformly distributed throughout the matrix. The hub 23 of the grinding wheel is connected to, and depends from, the central portion of the circular .or disc-like body 21. It embodies a central open bottom socket 29 which is shaped and adapted to receive the upper end of the spindle 8. As shown in Figure 3 the socket 29 is upwardly tapered in conformity with the upper end of the spindle in order that when the wheel is in place with respect to the spindle there is a friction drive between the two whereby the Wheel is connected to the spindle for drive thereby. When it is desired to replace the grinding wheel 9 with another wheel having abrasive particles of different mesh than those on the upper end surface of the Wheel 9the wheel, as hereinafter described, is urged upwards by the device I I in order to break the friction drive between the hub and the wheel and the upwardly tapered upper end of the spindle. The upper end portion of the hub 28 of the grinding wheel is solid in order to provide a closure member 33 at the upper or small end of the upwardly tapered socket 29. A

4 The arm IB overlies the receptacle 1 and nor-v mally extends substantially horizontally. One end of the arm is shaped to form a handle 3| and the other end is pivotally connected to a rotatable standard 32 in order that the arm is permitted to swing up and down and also laterally. A substantially vertical rod 33 extends through the central portion of the arm I and has a pointed lower end. The latter is adapted to t within a socket in a holder 34 for the lens blank 5. After the lens blank to be ground is applied to the holder 34 it is placed against the abrasive covered upper end surface of the grinding wheel 9. Thereafter the lower end of the rod is inserted into the socket in the holder and the blank is urged downwards by applying downward pressure to it through the medium of the pressure arm I9. During a lens blank grinding operation the blank and lholder spin about the rod and the lower surface of the blank is ground as the result of the abrasive action of the abrasive particles on the upper end surface of the wheel.

The device II has a twofold purpose in that it serves when actuated after a lens blank grinding operation to raise the grinding wheel 9 to a limited extent with respect to the spindle in order to break the friction drive between the wheel hub andY the upper end of the spindle, and also to brake or stop the spindle. It is located for the most part beneath the base structure E of the grinding apparatus and comprises a bracket 35,

a. lever 36, a composite extensible shaft 31 and a rod 38. The bracket 35 is located under the table l2 and consists of a floor engaging bottom plate 39 and a pair of laterally spaced upstanding side plates V49. The bottom plate 39 of the bracket is shaped to t flatly against the floor and embodies holes Y4I lfor lag screws'42.

table I2 on which the base structure 3 of `the apparatus is lpositioned or mounted. As shown in Figure l the bracket 35 of the device II is disposed directly beneath the front portion of the base structure 6 and'between the front legs ofv the table I2.'v The lever 36 is in the form of a the lever 36is provided with a foot pedal 44.-

When the foot pedal is depressed by the operator of the apparatus the lever 36 is caused to swing 'in a counterclockwise direction as viewed in Figure:

The rear end of the lever 36- is provided with a depending stop screw 45 for4 l of the drawings.

limiting clockwise swinging movement of the lever. `The shank of the stop screw extends into aninternally threaded socket in the rear end of theA lever 36 and embodies a lock nut 4B for securing it in place. The head of the stop screw is adapted to abut against the floor when the lever 36 isswung to its fullest extent in a clockwise direction. By adjusting the stop screw 45 inwards or outwards with respect to the rear end of the lever 33 the extent of clockwise swinging of the lever 35 may be regulated or adjusted. A leaf spring' 41 urges the lever 3B to swing in a clockwise direction as viewed in Figure 1. One endof this: spring bears against the portion of the lever 36 that is directly inwards of the foot pedal 44 and the other end of the spring is disposed between the side plates 40 of the bracket 35, and is opera. tively connected to a pair of bolts 48. When the. outer end of the lever 3B is swung downwards the free end of the leaf spring 41 swings downwards. and when the outer end of the lever is released such free end of the leaf spring springs upwards and serves to shift upwards or retract the outer. end of the lever. The extensible composite rod or shaft 31 is located above, and projects upwards from, the rear end of the lever 36 and comprises a tubular lower section 49 and a solid upper-section 523. The lower endV of the tubular lower section 49 is bifurcated. It straddles the rear end of the lever 36 and is pivotaiiy connected thereto by way of a horizontal pivot pin 5I. When the lever 33 is swung in a counterclockwise direction as the result of the operator depressing the foot pedal 44 the upstanding composite shaft 31 is shifted upwards and when the lever is swung in a' clockwise direction by the spring 41 in connection with release of the foot pedal 44 the shaft 31 is shifted downwards. The lower end of the upper shaft section 5i! i'lts slidably within the upf per end of the lower shaft section 49 and is releasably held in place by means of a set screw 52. The latter extend transversely through the npper end of the tubular lower shaft section 49 and when tightened locks the upper shaft section against sliding movement with respect to the lower shaft'section. When the set screw is re leased the upper Ashalftzsection may be slid up# wards Vor downwards with respect to the tubular lower section in order to adjust the over-all length of the upstanding shaft 31.4 The upper end of The latter serve fixedly to'secure the bracket in place. The.' side plates 40 of the bracket are connected to, and project upwards from, the central portion of the. bottom plate 39 and extend lengthwise of the" horizontal grinding wheel having a depending hub part shaped to slide into interfitting relation with the upper end of the spindle when the wheel is shifted downwards towards the spindle and adapted when in such relation to connect the wheel for frictional drive by said spindle, and a device designed for use in disconnecting the wheel from the spindle after a lens grinding operation and embodying a lever located beneath the spindle and mounted to swing in a vertical plane, an upstanding shaft positioned beneath, and in alignment with, the spindle, having the lower end thereof pivotally connected to the lever, and adapted when the lever is swung in one direction to move upwards into a position wherein the upper end thereof is in abutment with the lower end of the spindle, and a vertically extending rod extending longitudinally through the bore in the spindle, having the lower end thereof connected to the upper end of the shaft, and adapted when the shaft is shifted upwards in response to swinging of the lever in said one direction to raise the wheel to a slight extent with respect to the spindle and effect breaking of the frictional drive between said hub part and said upper end of thespindle.

3. A lens grinding apparatus comprising a vertically extending rotatably mounted spindle provided with driving means therefor and hav-ingv a bore extending longitudinally therethrough, a horizontal grinding wheel having a depending hub part shaped to slide into intertting relation with the upper end of the spindle when the wheel is shifted downwards towards the spindle and adapted when in such relation to connect the wheel for frictional drive by said spindle, and a device designed for use in disconnecting the wheel from the spindle after a lens grinding operation and embodying a lever located beneath the spindle and mounted to swing in a vertical plane, an upstanding shaft positioned beneath, and in alignment with, the spindle, having the lower end thereof pivotally connected to the lever, and adapted when the lever is swung in one direction to move upwards into a position wherein the upper end thereof is in abutment with the lower end of the spindle, and a vertical rod extending longitudinally in the bore in the spindle, having the lower end thereof connected to the upper end of the shaft so that it is longitudinally adjustable with respect to said shaft, and adapted when thel shaft is shifted upwards in response to swinging of the lever in said one direction to raise the wheel to a slight extent with respect to the spindle and effect breaking of the frictional drive between said hub part and said upper end of the spindle.` f

4, A lens grinding apparatus comprising a vertically extending rotatably mounted spindle provided with driving means therefor and having a bore extending longitudinally therethrough, a

horizontal grinding wheel having a depending hub-v part shaped to slide into intertting relation with the upper end of the spindle when the wheel is shifted downwards towards the spindle and adapted when in such relation to connectthe wheel for frictional drive of said spindle, and a device designed for use in disconnecting the wheel from the spindle after a lens grinding operation and embodying a lever located beneath the spindle and mounted to swing in a vertical plane, an upstanding shaft positioned beneath, and in alignment with the spindle, having the lower end thereof pivotally connected to the lever, adapted when the lever is swung in one direction to move upwards into a position wherein the upper end thereof is in abutment with the lower end of the spindle, and consisting of upper and lower telescopically and adjustably connected shaft sections, and a vertical rod extending longitudinally in the bore in the spindle, having the lower end thereof connected to the upper end of the shaft so that it is longitudinally adjustable with respect vto said shaft, and adapted when the shaft is f 5, A lens grinding apparatus comprising a vertically extending rotatably mounted spindle provided with driving means therefor and having a bore extending longitudinally therethrough, a horizontal grinding wheel having a depending hub part shaped to slide into intertiting relation with the upper end of the spindle when the wheel is shifted downwards towards the spindle and adapted when in such relation to connect the wheel for frictional drive by said spindle, and a device designed for use in disconnecting the wheel from the spindle after a lens'grindng operation and embodying a lever located beneath the spindle and mounted to swing in a vertical plane, an upstanding shaft positioned beneath, and in alignment with, the spindle, having the lower end thereof pivotally connected to the lever, and adapted when the lever is swung in one direction to move upwards into a position wherein the upper end thereof is in abutment with the lower end of the spindle, a vertically extending rod extending longitudinally through the bore in the spindle, having the lower end thereof connected to the upper end of the shaft, and adapted when the'shaft is -shifted upwards in response to swingingof the lever in said one direction to raise the wheel to a slight extent with respect to the spindle and effect breaking of the frictional drive between said hub 'partiand said upper end of the spindle, anda spring applied to the lever so that'it serves to urge the lever-to swing in the opposite direction in order to retract the shaft and rod.

6. In a lens grinding apparatus of the type that comprises a rotatably mounted spindle with driving means therefor, and a grinding wheel having a hub part shaped to slide into interiitting relation with the spindle whenthe wheel is shifted towards the spindle andradapted when in such relation to connect the wheel for frictional drive by said spindle, the combination of a movably mounted member, means operative automatically in responseto movement of the member in one direction to brake the spindle, and means operative automatically in response to shift of the member insaid one direction to shift the wheel away from'the spindle forl removal purpose and eiect'breakingof the frictional drive between the m hub part and the spindle.

7. In a lens grinding apparatus of the type that comprises a rotatably'mounted spindle with driv- Y "ing means therefor, and a grinding wheel having f a hub part rshaped to slide into interfitting relation with the spindle when the wheel is shifted towards the spindle and adapted when in such relation to connect the wheel for frictional drive by said spindle, the combination of a member mounted so that it is shiftable bodily back and forth, brake means operative automatically in response to shift of the member in one direction to arrest drive of the spindle and means connected `to the member and operative automatically in response to shift of said member in Said one direction to shift the Wheel away from the spindle shiftedv4 towards the spinuie and'- seaet'ew when; in f forwheei removing purposes and? eieot breaking. tliereotE conne'eted? to tirelever stndflts` upperfend oftlieiri'ctionafldnve the-huilt parti provided with ai ccmeisingl brake member, "and sai'despi'nde; v i l adpted when# thelevenis swungin. onev direction 8. Ina lens grindngfapparatus of tleitypeetlliat liminaire1 upwirdsinto"aepositioniwhereinithe' co- Uompri'ses a. rotatablymountedi spindlewiti drive? 5* nei/ing brakeemembenat its upper'end. is: in abutngj means therefor, and'` a; grinding' wheel vlianment withthe rst mentionedbrakemember, `and ing, a hulo` part sha-pedto slideT iiitjoiiiiterfiztliig.. theitwo membersf serve: to:I arrest. driveof. the relation with' .the spindle` when'A the wheel spindle; aim'ember connected?. tovtheupper: end of tariefy shaft sindv a'cleipi'e'd1 in connection Witlr. up-

.sueli' relation to connectitheiwheef for f 'riet'ionefl-l mi `wmdf-nrin vementi'ofthe slaJ-ftit'raisefthe wheel; to

drive by saidispindle; theV combinationvof'a; njrexnzl we slight' extent! Witlr respect totl'ie spindle,v and ber mounted so that it is shiftable' bodily' hack eieet breaking off tliefrictional drivebetweeni the and forth; brake meansioperativefautomatically Wheel hub part afndfsain upper end of the spi'nin response tov shift'. of thejineinbeit'infpne lifiedjlfe', and spning'mean's applied toi/ghe.- l'eve'r. so. that tion toY arrest. drive of thespindle; means cond is? liiifser'vfesitoure'eetiie latterftio s'vszingl in the. oppoicallly in' responseto s hifsj of sail'member in said lill. A-lens'grindingappetratuscomprisingfaverone direction toV shift the wheel away' frozl tiljie vtleallyextending'rotatablymounted'spindle pro.. spindle' for wheel.` removingv purposes* and effect videdw-ithdriyemeansfthereohaving'a.boreex breaking of the frictional' drivezbet'ween tliehgi-1j'a 2): #Ending llmgitudinlly bhelthrOUgh'aHd'emOdypart and' said spindle',y and? spring; means applied i'ngfat itsflower end-va: brake' member; ai horizontal to the member so that riturges the; latter. inthe 8"1"i1 1d1g Whe having at ylel'ndHg` huh" Dart opposite direction. r M slapedlto' slide-into -i'nterfitting'relation-.Withithe 9`. A lens grinding-apparatus; .ompriging n v upnerendoi:thespindleiwlen.tlewheellisishifted (fombnationA Hra, .vertically extpqngf rijgijgjl,r [gg tUWaTdSf the? Spindle aldadapted mountedspi'ndle proViledwitlLnie-an's iondrioin Whenv inl relation'. toi' connect'. the; Wheel. for it and embodying anitslower. enxazbrake friztonail drive-byf-vsaid spindle, a; lever located bene. liorizontalgri'ndig'wheel-having a depend; beneath fifi@ Spindlel and? mounted'. to swing' 11T a ingliub part shapedto. slidein'o.intertting'pelal A *ver-tie'ztlifplane;V en. up'slanding shaft positioned tion with. the upper endv of the' Spindle when'.trie@` 3'0" leneathg.:andinialignment;with; th'efspindleilhavwheei is. shifted downwards towards the' spingi@ msfrthlbwerfendtherebfpivotelly"donnectedvto and adaptedi when. in, such natation t, connect; 'the-lever anditsupper endprovidedfwitheconjetthe wheel for. f'ricti'pnal drive, by said', spimnfswfa",v ling brakemembei-andadapted-:when the lever4 is rever moeten, beneath. the spindle. and :munir-.m1` Swuleil'y One' direction to move upwards info? a tofswingin. a vertiea1 planqgn, upst'agngmshgnnw position wherei'na 'itsb enacting." lorekeymember.` is positioned'.beneath anim. ii'gnment.with,.tiie .irreneasement withitnef firstm'en'tloned'.- brake spindle, having,Y the. lower. end tiereof. connected' l member andfheftwoi-brake members? serve to ar- 13D, the lever and., ifs, end; pfgyidgd wlji;h` -IYBS dIiVB pff the*- SDIICUBQ'- and' Vl'ti'cal. 110@ 6X- coastingv brake. member, anddptedwhem the tmilg longitudinally through the'- bor'eln'. the levei; is. swung. in. one. alreet'ion to moyeugiwarH-s{0L-spindle; havingf the. lwer end' thereof. connected into. a. position whereigtthecgactmg, rakgmmtoitlieiuppex' endloi-"the'sletftgy and'. adapted? when ben M 'iupper end fsinabmmengthgt" tlie shaftisl :novedl upwards? intnl the* aforemenmentionedv brakememlerl arid-.the twoP members time@ DUSOHD" fasetwheeltb' a' slight eX- serveto arrestdrive of the Vspindle, .stricto;n gin. j v tentwith'frespect'torthe spin'dleiand'efeot breakber connectedv tothe upper end. ofthe' snaft; and lng'orthenictionafdrivef between-:the wheelzhub adptedlinconnection.with upvairl:moyein'eri't. of` f Pm'and Saiduplfe" endv3 0f the'spndle? tneshaftto misethe wheeitaas'iight.extenewith LECPQLD'H- METZGER? spect to. the spindleV andh effect breaking; ofi the WZSONv B3 MUSE# 'icti'onal drive] y between the wheel hub pant udma? REFERENCES CITED said upper. endofi thespidle..

. standingshaft. positioned bepeathlanejmpgm @22911529- Japksonetal; ;Aug. 4;v 1942 ment with,7 the-spindle:- havlne the lower. eine... 2.3543347 Peers l Jiiiyfzfegieii