US1686364A - Lens-blank-holding means - Google Patents

Description

1,686,364 W. BAUscH Er AL LENS BLANK HOLDING MEANS Filed June 29, 192s Patented Oct. 2, 1928.

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WILLIAM BAUsoH Anncroniv nrowEnL, or. ROCHESTER, New Yoan, yAssiefnolas `fro BAUSCH 8c LOMB'OPTECAL COMPANY, vGF ROCHESTER, NEW YORK, A CORPORATION- i l OF NEW YORK.

Application fned .Tune 2a,

l l ment in tilted position upon amajor lens blank to permit the former to gradually and.v

progressively approach and unite Vwith the latter during theV fusing period' whereby to avoid the inclusion of air bubbles betweenthe fused parts.

A further object of the invention is to pro-. vide improved holding means for lens blanks which is of simple construction, comparatively cheap to manufacture and convenient to operate, and which is capable of withstanding line/.7-7a of Figure 1,

the high temperatures to which it is subjected in the fusing of the blanks supported thereby.

To these'and other ends the vinvention resides in certain improvements and combinations of parts, 'all as willbe hereinafter more fully described, the novel features being pointed out in the claims at the end yof the specification.

In the drawings: f y v Figure 1 is a plan .view'illustratingone embodiment of the invention; y

Figure 2 is a front elevation of the' same i l v J erablyp from the lugs 19 are a pair ofpins-or supports 2O suitably connected withsaid lugs Y Figure 3 is aside elevation; Figure 4 1s a rear elevation; Figure 5 1s an enlarged sectional elevation showing the parts in position for holding the` minor lens blank or segment in tilted position uponA the major'lens blank;

Figure 6 is a similar view showing the-po- Vsition assumed bythe tilted lens blank, or segment after fusion ofthe latter with'the major lens-blank; and j 1 Figure 7 is a sectional elevation taken onV Similar reference numerals'throughout the several views indicate the same'parts. Y

In. the fusing of bifocal lens blanks" of the variety, for example, in which the major l' l [blank is recessed to receive the button-or seg-Y 'ment constituting thefreading portion of ythe Y bles which may form between the blanks willlens, it is essentialv that the'latter be held in tilt-ed positionwithin the recess of the Vformer whenplaced inthe furnace to permit itvtc gradually and progressively unite with the main or distance blank, so that all air'bub- 'be driven out during the fusing process;

LENS-BLANK-Hotnme MEANS.

1926. sei-iai No. 119,445.

a holder 'or support 12 thereon for the major lens'blank 13 `which Yis-recessed at` 14 to re-4 celve theminor lens blank or segment 15, as shown 'in lFigure 5. VT he'support 12 may be formed'of any suitable material capable ofwithstanding the fusing temperatures to which the lens blanksfjare subjected..` vThe' frame V1l is preferably y formed of a 4suitable metal which will also resist therelatively high temperatures to which the parts are'subjected.

during the fusing process. The'upper face' l of the support 12 is shaped to conform'to theV of upstanding rear lugs v19l which sei-ve to 'the bottom of the sup-` face. of the lens blank to be disposed thereonQ "n upstanding front lugs 18v and also `a pair center and hold the support V12 in proper posiu tion within the frame. The lugs 19 are eX-V` vtended above the support 12 and are curved` on their inner faces to receive and prevent rearward displacement of the lens blank Extended upwardly from the base avndpref-V and forming parts upon which yto adjustably 'di i mount the'll'neansfor 'holding theblank or r Figure 5. y

segment 15 in the tilted position shown in to permit-.the bar-to have a limited swinging a y movement about anaXis passing through the' pins: VThe bar is provided with a centrally disposed and laterally projecting .arm 22 eX.`A y tended v above the segment orblank 15' inu` spaced relation thereto. The arm ,carries on Vits free end aweight 23constitutin'g valso a handle for vliftingthe barand whichfmay be" Y formed integral with or connected to the armf bly'inclined.upwardly showniand togetherv with the vweight 23 'serves to rtilt 'or Arock the."

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bar 21 upon the pins 2O 'aslight amount to f `cause'it to bind thereon, which is permitted by reason of the factthat the holes 22 are 11s-sesta ing inV a direction transverse to the direction oftiltling.V y The lower lends of the lingers 24 are to'fengage the blank 15 Vrearwardly ol the centers the VpinsQO.` Bythus positioning the lingers 'any' pressure exerted Y up; wai-diy thereon, dueto expansion of the segnient ,15 "when being heatedV inthe furnace, will tend to rock or increase the tilt'of the bv'a'r from the normal inclined position whichit is: held by the Weighted arm, thus jinereasing the'binding action betweenftlie efndslfofthe bai/"and thesupporting pins therefor and henceflocking. it against upward displacement. e c p l "As Vthe ltemperature to which the glass is l Y subjected is increasedto the point at which they'latter ybegins to sotten, theaction of gravity will caiijse'the segment l5v to graduallydescendto the bottom ot the recess 14, the downward swinging movement ot the lsegment resulting in the lower surta/ce thereon being finafde to` progressively contactavith tlie'surfaceot the major lens` 13thus forcing out any air bubbles tending to form between.

or,v united one withanther.

the blanks while; the latterl arebeing'ffused y 'LVe claim as onr'invention: f

device for' holding a lens segment in tilted positionup'on a lens blank,` comprising a base `for, supporting the, blank, spaced j guidesfeiitending upwardly from the base, a bar slidable'andftiltable upon the guides and adapted to be frictionally held in'v adjusted position thereby, said bar-having downv ardly projecting means adapted toY engagev the segment rearivardlyof` saidv guides to hold it in .said tilted 'position and serving also toV i prevent its rocking in a direction transverse Vtothe1 direction of tilting, anda weight connected with said barand serving vto hold it tilted inthe desiredposition of adjustment.

2. `A device for holding aleiis segmentv in tilted position upon a lenslblank comprisingay basek for supporting the blank, spaced sup` ports vextending upwardly from the base, av member tiltab-le upon the-'supports to beV f frictionally held;*therebyv and including a weightedmportion overlying thel segment in spaced rrelation' thereto, and spacedv lingers projecting. downwardly, from saidineiiiber j .an ienffaoino- -ie seenieii' j io ci insaic Ad @D on "c, yttoi ii t yi 1,686,664 v v fr,

tilted position and serving also to prevent its rocking inv a directiontransverse ,to the ldirection of tilting. l I 1 f u 3. A device for holding a lens segmentin tilted position upon a lens blank, comprising i a base for supporting theV blanlnaA inem-ber tiltably mounted upon the base about. an axis at one side thereof and downwardly projecting spaced lingerscarried by'said member adapted to, engage the segment rearwardly ot said axis, said iingers serving to hold the segment in tilted position andl preventing its rocking in a direction transverse to the digy rection ot tilting. i

il. A device for holding alens .se-gmei-itin tilted position upon a lens blank, comprising a base V:tor supporting theblank, spaced pins extending upwardly from the baser, a bar tilt-x ably positioned upon saidlpins whereby it is trictionally lielgdthereon, depending means carried by the baradaptedfto engage, the segment to hol d it insaid tilted `position and also serving to prevent-it from rocking in a. direction transverse tov the. direction of, tilting, and a weight for `holding-said in. tilted position comprising an arm, projactingv from the bar and having Van u staiidingV por!y tion `forming a handle. tor adjusting tliebai upon said pins. 'A i l 5. vA device for holding aflen's segment in tilted position upon a lens blankf comprising a base; for supperting.l the, blanlgspaced pins. extending upwardlyfromI the hase, a bar.

having openings slightly larger. tlianthe pinsf adapted to` rece-ive the, latter, spaced lingers depending from said bar adaptedto. engage.l the segment rearwardly of thev pins toliold'it inv tilted posit-ion, Van arm exteiiding `la,teral, ly irom the bar and orwardlv of said lingers in spaced relation tothev segment and. allfupstanding weightfupon, thearin forming a handle, or'adjustiiig thebary aiidjcausing the c latter to tilt upoiii'theA pinsY whereby vit frictionally held in adj usted positiontli'ereon.

6. A device for holding 'aclens sci {iiieritin,A

tiltedY positionupon a llens blankf,coinprisi ng a base forsupporting the blank", a, bari lia'yifng az limitedv swinging movement upon, the base about an axis at onesidetherfeof liaying` downwardly extending means adapted toen-l gagethe segment rearwardly of saidziairkisto hold'it tilted upon the blank. and, to prevent,` its. rocking in,l a directiony transversetn'tlie direction oitilting,ank forwardlyprojecting weight extendingrioni-'the baigiovertllie segmentmin spacedg relation.. thereto and,.servaI ingy to hold tliebar.. inposition,to maintain i said d ownwardly,` Yextending means in en`` n k.gagement, with the.segment.j I i WILLIAM Balises. l, f JOHN; eowinin,` j

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