US1127013A - Lens-fastening. - Google Patents

Description

F. H. KAHN. LENS FASTENING. APPLICATION FILED-AUG. 28, 1914.

Patnted Feb. 2. 1915 ST'IES LENS-FASTENING.

Specification of Letters Patent.

Patented Feb. 2, 1915.

Application filed August 28. 1914. Serial No. 859,089.

To all whom it may concern:

.Be it known that I, Fnuxnnno H. KAHN, a citizen of the United States, and resident of San Francisco, in the county of San Francisco and State of California, have-invented certain new and useful Improvements in Lens-Fastenings, of which the following is a specification.

This invention relates to means for preparing lens blanks for'inounting purposes, and it consists in the main of means whereby a metal plug may be incorporated in a lens blank, in order that by this means a metal bearing may be provided in and aboutsaid orifice to receive the screw or rivet whereby the mount is secured to the lens, to provide rigid surfaces within the lens whereby said mounting screw or rivet may be securely tightened without risk of fracturing the lens.

One form of my invention consists in the provision of an orifice in a lens blank in the appropriate position, said orifice converging inwardly from opposite sides of the blank, filling said orifice with molten metal which thus becomes fused within said orifice, and, due to the constricted character of the orifice is securely anchored therein. A lens blank thus equipped is then properly shaped,

ground and polished and the metal plug therein is drilled axially with the hole to receive the usual mounting screw or rivet, which latter may then be secured tightly with the metal plug as a solid unbreakable bearing therefor.

In another form of my invention a metal plug of the desired shape may be placed in a suitable mold and molten glass may then be poured into said mold about said plug for the molded production of a lens blank with plug insertion, the lens being shaped, ground and polished subsequently. The plug, which is preferably of metal, but may obviously be of other suitable material may be so externally shaped or notched as to be incapable of rotating in its lens orifice or bearing.

Other features and advantages will appear hereinafter.

In the drawing accompanying this applition: Figure 1 is a plan view of a rough lens blank, having a metal plug. Fig. 2 is a cross sectional view of Fig. 1 taken through the plug. Fig. dis a cross sectional View. of a lens that has been shaped and finished from the aforesaid blank, with a hole drilled axially through the plug, and Fig. & is a plan view of Fig. 3. Fig. 5 is a detail of a lens having an orifice with centering spurs to fit in peripheral notches in the plug and hold said plug against rota tion. Fig. 6 is a similar view showing an oval orifice with oval plug therein for a s milarpurpose. Fig. 7- is a cross sectional view showing a one sided strap for-connection with the lens, and Fig. 8 is a similar view showing a usual form of strap applied to the lens.

In carrying out my invention, I take an ordinary lens blank, such as shown in Figs. 1 and 2 and provide near the edge thereof a transverse orifice a of are-.1 greater than is usual for the reception of a mounting screw or rivet. Said orifice is preferably constructed as seen from opposite sides of the blank, and is filled in any suitable manner with a metal plug which may be produced therein by pouring molten metal into said orifice, becoming fused therein, the constricted characted of the orificecausing it to provide an anchorage to retain the plug therein, preventing it from becoming dislodged at either side of the blank. The metal employed for this purpose may be of such melting point that in a molten state it may with safety be filled into the orifice without'liability of splitting or damaging the lens, and'the expedient may be resorted to of raising the temperature of the lens to approximately the temperature at which the metal is introduced in a molten state to the same end. \Vith a metallic plug introducedin the lens blank, the latter may be treated in the usual manner in shaping, grinding and polishing the lens, and at any desired stage in the operation the metallic plug therein may be drilled with a. hole, as b, to provide the usual orifice threaded or otherwise for the reception of a mounting screw, rivet or other fastening pin. The finished lens with its metallic plug .1511 bearing will be free from the usual liability of damaging the lens when tightening up the mounting screw, or performing a riveting operation whereby the lens may be so securely attached to its mount as to be free from the danger of the connection becoming loose.

It is well knownthat when pinning the usual strap to a lens by means of a mounting screw, the joint cannot be tightened up beyond a certain point as'the pressure in so r a a like purpose.

t Wlille I havedescribed the plug as. formed in the'lens blank by pouring molten. metal therein-tit is'equally obvious that'the process may'be reversed and the lens blank produced by -molding 'itabout a. formed; plug, the re connector:

doing would cause the leiis'to fly, 'but this improvement whereby a metallic bear:

ing of suflicient"ala -is'furnished,it will be 'quite evident that the tightening ean be 1 '5- efficiently performed and the mount rendered perfectly. secure. v "-'As shown in"Fig 5' the orifice in the lens may have intruding spurs son-projections 0 whereby, when the plu as cl is formed 1,0 ltherein' said plug will be lneapable of loosening by'rotation. Or, as in Fig; 6 the orifice -may beof oval or other; irregular shape for s'ult's being the'f' same in .both instances; In thellatter'ease the plug may if desired be drilled and threaded before the lens blank jfir ledaboutiti the d vantages' 'of the'rigid bear: which the metal or other plug affords for-the mount-is that thescrew or other fasmay besofirmly secured therein that jlle strap'isnot-require'd'to extend ,over both sidesef. "the lens. 'Thusg'inFig. 7 I show a.

"-arapf whichf v y onesidefi adwhich may befiinne'ri side of the lens, next tlle' outer side exposing only-the plug and clio'rag'e'j I I "f ,2. A lens having a transverse orifice, 1n-

' wardlyconstricted from; opposit i orifice containing a [metallic plug "fused therein to form, a permanent bearingpor- 'tifdn and axially 'pie'rced to receive a *mount f z. 17 hi3. A lens having a transverse orificet'pernian'entl'y oonstricted inwardlyfl from oppobo'sitesides, said orifice conta' ing a metallicfplug therein, said ug' at o posite sides forming bearing surfaces'by-w ichto secure a" mount.

fl. The mahdd' of making lenses for eyeglasses and the like consisting in forming an enlarged orifice transversely throughv said. blank, fusing a metallic 'plug in said tion, shaping, grinding, and finishing the blank in lens form, and forming a threadin vsaid orifice to receive a mount supporting screw. I

5', A lens having a transverse orifice inorifice to form a permanent bearing porv wardlyconstricted from opposite sides and a plug of relatively infrangible', material molded therein to:form aninterlockingpermanent anehora'ge.-

-6. A' lens having a transverse orifice inwardly constricted from opposite sides and a .plug of relatively infrangible material therein, one of said elements having molded engagement -with the other to ,efi'ect'an in terlockingpermanent union. I

7. 'The-eombination with a lens having a plug I of -relatively r infrangible I unyielding material biperm'anently held therein, of a mount strap extending over oneside only o-fsaid lens, and means connectingsai'd strap with said plug,

8. In eombmatron,"a lens having -an-intermediately constricted transverse aperture therein; and a plug of relatively'infrangible,

unyielding material m'olded within said orifice toiieompriseif apernianently anchored bear ing portion of said lens, said plug-beingl pene'trated with a threaded orifice-t0 engage a mount screwrsubstantially throughout ltsextent. v v a I t 9. A lens whichdlas been shaped, ground and polished from a blank provided with a transverse= orificeinwardly constricted from opposite sides, said orifice havingp molded therein-a permanent bearing portion in the form of a plug of, relatively'mfrangible, unyielding material whoseexposed surfaces lie in the radius of curvature of the finished lens, said plug bein'g a xially pierced and threaded to engage a mount awsubstantially throughout its extent;

{Si ed at SanFrancisco in the county of 'San %rancisco and Stateof California this 8th dayof August A. D. 1914.

- f FERNANDO H. KA'HN.

Witnesses:

' K. DAGGETT, J, HrBRUNNsR.

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