[1]1 9 5 4 6 9 8 3 0 Pahnted July 21, IM. UNITED STATES PATENT OFFICE. 3FB=D]L", O]iPn-M33U]&GH, PMNSYLVANIA, ASSIGNOR OF ON7,HALF TO MARTIN GLUCK, OF PITTSBURGH, PENNSYLVANXA. WATCRE ORYSTAR,. Application tied lanuary 17,1925. Serial No. 3,089. To aZZ w - 7WM.itlwy-concem: Be it known that I ALEXANDFR FRMMAW. a citizen of the TJnlted States, residing at Pittsburgh@ couniy of Alle_gheny, State of Pennsylvania, have invented a new and useful Improvement in Watch Crystals, of the foll' wing - is a full clear, and which 0 exa-et description. Z, The present invention relates to watch io c : rystals, and more particularly to watch crystals of ceruloid or like material, which are ordinarily known as unbreakable watch e,rystals. Heretofore, these watch crystals have been made e'ith6r flat or slightly convex i5 and have been spruiag into the groove of the bezel of the watch. This is ordinarily accomplished by-clamping the erystal between male and female dies shaped to increase the e,onvexity of the crystal sufficiently to-allow 20 it to slip, into the groove of the bezel and theja releasing the crystal gradually from the clamping pressure.of the dies, whereiipon the crystal, in tending to a@sume its normal shape, makes a tight fit in the groove of the 25 bezel. By 13endinL, up the crystal and fitting it -in the bezei,- the er . ystal is placed under tension and its tende . ney to uiabend and force the edges thereof outwardly is depe@,ded upon to hold the crystal in the bezel. 30 der the heat of the body, a crystal secured and held in place in this manner tends to lose its spring and to warp, thereby indreasits deformation due to the bendiiag up of re crystal in placiiag it iia the bezel so that 85 the,crystal becomes loose in the bezel, and if it does not actually drop out., dirt is arowed to watch casin around the sift into the 9 10OS43 edges of the crystal. In accordance with the method of my 4o present invention I form a wateb@ crystal of the unbreakable type by ttking a flat blank of material, such as celluloid, and molding it between heated dies so as to produce a raised or embo-ssed body portion having a perma45 nent; downwardly extending and preferably outwardly incliiae@d periphetal shoulder terminating in aia outwardly extending bezeln a edge portion off-set into a plane 'o ef O,pn g b the raised or embossed body portion 50 of the crystal by said permanent shoulder. This gi*es the body portion of the crystal a dome shape which, with the permanent shoiilder adjaceiat the d'- @ of the crystal, el gives more space beneath ti(e crystal so that 65, the ends of the watch hands do not have to be bent over towards the face of the watch,, and gives more space for the free movernent of the hands. The width of the outwardly extendinlr edge portion will be determinecl by the size of the particular watch witli do which the crystal is to be employed, and will be trimmed accordingly, and since tlie'e'rystal is molded to permanent sbape, it does not depend upon being sprung into place to holcl it in the bezel. Furtbermore, by rea- 65 son of the permanent shoulder, and also b3, reason - of the fact that the body portion of the crystal is,--molded substantially flat and under heat, the heat of the body does not af - feet the crystal so as to cause it to become 70 loose and drop'out of the bezel. The nature of my invention will be more fully understood by reference to the accompanyino, drawings, in which:- Figu re 1- is a plan view of the bezel, of an 75 ordinary round wateli baving a crystal embodying my invention; Figu re 2 is a section on the line 11-II of Figur,e 1, and Figu res 3 and 4 are perspective views ancl 50 rigure 5 a plan view of di rent shapes o cr7stals embod ' ,ying my mven tion and adapted for use with -wrist watches, these last three figures showing the crystals complete excep t for the final step of ti-imming their 85 edge porti6ns to the desired width to fit the bezels of -the watches wvh which they are to be employed. Ref errin t Fi res 1 and 2, 2 designates the bezel of aon orl@mary round watch and 3 oo the crystal, which wiE ordinarily be of celluloid. The crystal is molded so as to have a slizhtly convex body portion and a do@vnwarctly extending and outwardly inclined peripher al shoulder 4. This shoulder ter- 95 minates in an outwardly extending bezel engagiif edge portion 5 which is off-set by the shoul er 4 into a, plaiae belo-w the domeshaped body of the crystal. This edge portion is trimmed to the 7proper width so as to ioo enable it to snap into the groove 6 of the bezel. Figu res 3, 4 and 5 iru:strate e-rystals for wrist watches at one stage'of their process of manufacture, namely, before the final step 105 of trimming their bezel-engaging e4ge portions. 'Since the crystals shown in these fhree figures merely differ from each other in hape, a description of the process of manufac turing the crystal shown in Figuye ilo
[2]1,546,830 3 ivill suffice. This crystal is made by takincr i blank of celluloid or similar material ai@(I niolding it bet-%-,76en heated dies to give it the shape shown. It has the raised or em.r) bossed substantially flat ' body poition 7, the peripheral slioulder 8 and the flanoe 9 off-set below the raised body. portion by theshoulder 8. This flange is adapted to be trimmed to the desired width, as, for example, aloiig the dotted line 10, to pr6vide the bezel-engaging ed@-re portion of the proper width to iyliieh the crystal is to be employed. The I)i-ocess of rnanufacturing the crystals sliown iii Fiaures 4 aiid 6,, as already stated,is the same as ille I)roces@ o.f malkiiig the crystal in Figure 3. In Figures 4 and 5 the @'i)di@ts correspoi,.l(liii(v to the parts of Figure ell 3 are desigiiated,,by the same reference nuiiierals-witli a prime affixe,d in the case of Firpure @'aiid a double prime a@nxed in the case of Figure 5. The above examples are simply illustratiie of niy inn;ention, it being apparent that 25 tj ie invention is not confined to any par ticular shape of crystal.. T
