DE1652212A1 - Lens bracket for holding lens blanks and method for jacking up lens blanks - Google Patents

Description

PATENT LAWYERS

PATENTANWÄLTE LICHT, HANSMANN, HERRMANN • MÖNCHEN 2 · THERESIENSTRAtII IS

Dipl.-Ing. MARTIN LICHT Dr. REINHOLD SCHMIDT DipL-Wirtsdi.-Infl. AXEL HANSMANN Dipl.-Phys. SEBASTIAN HERRMANN

MOnd »n, d« n 15. ΝθΤ · Β »Γ 1967

YourZ * k * »n

TEXTRON INC.

Providence, Rhode Island 10 Dorrance Street (V.St.A.)

Linsenbock sur holder of lens blanks and procedures for jacking up lens blanks

The invention relates to a method for jacking up lens blanks and a novel lens book that goes with it.

In a known method iur manufacturing eyeglasses is a semi-finished lens blank made of molded material, for example (ilas or plastic, on its front or

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Patent attorney · Dipl.-lng. Mortin light, Dipl.-Wii1teh.-lng. AmI Hammonn, Dipl.-Phys. SebcnKon Herrmann • MÖNCHEN 2, THERESIENSTRASSE SS · Τ. · * «, *» «· ..» y. l ^ MM «Son ^ fal ^ nniim DmImIm Bank AO, Branch · MtM *». 0 ^ * mm YlUmüimmmria. * · . nmm _ ^^

OpnnniftrMnr PATENTANWALT DR. «UNHOLD SCHMIDT

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outer surface finished. This outer surface is usually convexly curved and manufactured and machined according to specifications so that it is in a defined · Can be used richly. The half-finished blanks are sold to optical workshops. When manufacturing and polishing the inner, concavely curved, unfinished surface of the semifinished blank to the complete Fulfillment of the requirement are required, the semi-finished blank is attached to a lens book, which is designed in this way is that it can be clamped in the machine that creates and polishes the blank.

Lens blocks can be made from hard or very soft metals

"r V * can be made, the latter having a low melting point exhibit. Some of these lens mounts are center-hole provided that measuring the thickness of a Linaenroblings enable while it is attached to the lens bracket. Such openings only need very small for this purpose to be. !

The main object of the invention is to provide a protective plug that can be inserted into the central opening of a lens bracket fits and serves to seal the ocular vertex in the surface zone of the lens and thereby prevent - that this surface during manufacture and polishing

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The lens is scraped off or otherwise scratched by abrasive materials. The protective plug exists preferably made of elastic material, so that it can be removed by loosing it, so that the performance and that Prism of the generated lens can be checked and, if necessary, corrected before removing the lens mount can be. The protective plug can then be reinserted, which means a revision or a renewed Finished ™ Processing of a surface to correct any inaccuracies regarding the power or prism of the lens that have been found to be made can.

With the known lens blocks and especially with those that are not provided with a central opening, the inspection of the Leir.tuiif; and the l'rism of the lens impossible as long as the lens is attached to the dock. Only after the g

Lens bracket has been removed, the lens can be related These values are checked to see if they are legal . is made. However, should it turn out that it does not comply with the regulation, it is practically advisable to jack up the lens again in such a way that .Let them .be in the same position in the aio surfaces have been previously achieved and polished.

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On top of that, in cases where the lens is made of glass exists, possibly the regulation, i.e. the preparation recipe, can be endangered by trying will have to rework the lens on the old and defective surface primer. It is therefore often advisable to to use a new lens blank instead of the old defective lens and the same process as originally was applied before the bug in the regulation was found to perform again. However, this not only takes a considerable amount of time, but also Wasted lens blanks.

On the other hand, if the lens material is a plastic, then it is not just the repeated «jacking up, in such a way that · the second lens blank is correctly positioned, difficulties but also those required to melt the metals used to make the original lens mount Heat, due to which the previously ground lens can be discarded or otherwise damaged, so that it can no longer be used and thrown away become nut.

To avoid these disadvantages, the present invention makes a removable and restored to the original

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Place adjustable rubble stopper created. This StBpsel prevents the eyepiece vertex surface of the semi-finished Lens during the manufacturing process and polishing " the lens is damaged by abrasive materials and allows rapid inspection after its removal the accuracy of the power and the prism of the lens has been reinstated, if necessary or borrowed, yet once sanded and polished without losing the original Lentil holder will be taken out of service. This measure does not only bring a further saving for the manufacturing process and the polishing of the lenses, but it also enables the lens soles to be eager to manufacture the lens to strictly adhere to the regulation, and «rarely using only a single lens bracket ·

Embodiments of the subject of the invention are in Drawing, to which the following description refers, shown schematically. Seigern in the drawing

1 shows a bottom view of a lens bracket according to the invention with the corresponding protective plug according to a

Form of the £ rfindun ^ s Gegenatandea,

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2 shows a partially sectioned and partially from the front seen · View of the links shown in Fig. 1 »

Fig. 3 is a bottom view of another lens bracket old a removable plug that sits in a central opening ± m book,

. k a partially sectioned and partially seen from the front view of the in Flg. 3 -shown links, and ■

Figures 5 to 13 are partial sectional views of one above a central opening Lens blank fastened in a line bracket »With different kinds of protective caps, which are designed in such a way that ice can be inserted into the central opening of the trestle.

In FIGS. 1 and 2, the lens bracket shown at 1 is made of a soft or low-melting metal, which was poured onto the outer surface 5 of the lens, the first with a plastic material or tape that is not shown, could be provided, if the Uiessmaterial of the lens bracket does not contain an additive, which allows the lens bracket material to be applied immediately adheres to the lens surface. The lens shown

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can be made of glass or cast from plastic material be. The plastic coating or tape, if used, or the metal of which the lens bracket is made, tend to attack the lens surface and of course must be both the surface of a glass and ' seal a plastic lens so that the lens does not scratched or otherwise warped or damaged. "™

The lens bracket 1 is provided with a cylindrical head part 2, the one inverted truncated cone, downwards coaxially protruding shaft part 3 (Figs. 2 and 4) and ends in a circular, flat surface which is perpendicular to the axis of the lens bracket 1.

If the lens bracket is poured to the surface, for example from a material with a low melting point, a ring, not shown, can be inserted into the Λ shape, which forms a flat Meesflaohe 9, which is used to check the prism. The surface 9 runs parallel BU of the original horizontal upward axis or reference line of the lens and creates a reference point such that the lens boa is known at all times while the lens is jacked up. This surface 9 can therefore be used as a measuring surface, so that the prism of the lens quickly on a

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Vertometer can be checked while the lens bracket is still on the lens. The flat surface 9 works but also as «in · measuring surface, from the outside · di · optical · or mechanical means of the lens can be determined.

The surface k of the lens bracket is cast onto the outer convexly curved surface of the lens. This surface 5 is preferably manufactured and finished in accordance with the specification in such a way that the lens itself can be viewed as a semi-finished line blank, with the curved surface 5 representing the finished surface of the line blank. The surface k adheres to the coating located on the surface 5 of the lens or touches the lens directly, which depends on the property of the low-melting material that is used to manufacture the lens bracket.

The inner surface of the lens bracket, which is surrounded by the inverted conical shaft part 3, is preferably provided with three parallel bores. The central bore 6 is provided for the plugs 8, whereas the kuppelrörmi designated with 7: ~ en bores, of which one on each side I of: are ittelbohrung 6 is so deep that they are for fixing the lens bracket in a known manner into one

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Machine suitable that the inner surface tO of the lens grinds and polishes. -In addition, the holes 7 can be used to clamp the blank in the machines »old them the power and the prism of the lens is measured before the lens is completely finished and the lens bracket removed from the lens and commonly referred to as a vertometer.

The used for molding the lens bracket 1 metal with a low melting point is preferably an electrically conductive alloy of Vismuth, lead, tin, indium and cadmium "present in desired proportions," then that an alloy with a low melting point of approximately 5S ⁰ C is obtained. Such a lens block can be repeated with Hilfp one that is provided specifically for this purpose haschine, casting, in which a ring aur forming the measuring surface 9 is inserted and the Schut "Stoep" el 8 inserted, before the like lens block is cast, so that the bracket 1 is poured exactly around the protective plug 8 and on the same side exactly the transverse, flat surface is created on the outer end of the inverted conical shaft 3, as well as the spaced-apart, arched holes 7 after the lens bracket has been poured and has cooled down , the protective plug 8 can be removed, which is released through the hole ö.

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In FIGS. 3 and k , a lens bracket 1 consisting of two parts 11 and 12 is shown. The outer part 11 is similar in terms of its outer shape to that in FIGS. 1 and 2, while the inner part of the block represents a plug 12 which is arranged in an axial bore in part 11.

The plug 12 is preferably made of a material with a low melting point, but the melting point is not as deep as that of the material from which the outer part 11 of the lens bracket is built. The inner part 12 of the Lentil bracket is inverted with a frustoconical shape Surface 13 is provided over which the outer part 11 is cast so that the outer part is supported on this surface.

The inner part 12 of the lens bracket contains the central bore 6 which receives the protective plug 8. The remaining inner surface ] k of the inner lens bracket 12, around the opening 6,. however, contacts the lens or the coating on the lens to thereby support the lens.

Each of the two curved holes 7 is located for Half in the inner plug 12 and half in the outer

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Part 11 of the Bockoa. The axes of these three parallel bores 7, 6 and 7 are arranged in the casting machine for dividing the lens bracket into a predetermined position, and to the axis of the design b * w. Aligned drawing line of the line which is drawn on the inner surface 10 of the lens itself and oriented according to the prescription. The lens bracket is then cast and molded onto the surface of the lens. By rotation is Linae in the casting machine% the prescribed Leistungeachsenausrichtung and finished · Kitt · · · Lin sum purpose of lens shift are set.

Vie from FIGS. 2 and k Eu can be seen, the protective plug 8 shown is approximately the same as that in rig. 11 shown. However, other forms of this protective stopper are described in the remaining FIGS. 5 to 13 *

The modified, externally threaded · SchutsatBpsel 20 of Fig. 5 can be any! suitable material, for example Nylon or another suitable plastic known in the trade as Teflon, or ouch a material of the acrylic group or another either thermosetting or thermoplastic plastic will. This plug is designed in such a way that it can be held in the machine that the lens holder pours around it

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can. For this purpose the plug is sufficiently long that it extends beyond the incised bottom surface 16 (Figures 2, k, 6) of the lens bracket and is provided with a finger-like grip 22 so that it sloh when the handle is rotated is, can be unscrewed, its thread 21 only needs to follow the groove 26 formed in the opening 6 in the axial center of the plug.

If nylon or Teflon desi directly on the surface 5 the lens seated plug 20 do not give sufficient elasticity, the lens can su this purpose with a be coated with softer material ». However, Teflon should actually be pliable enough to get the right result reach.

The plug 23 shown in FIG. 6 has opposing, bowl-shaped ends, as shown at Zk , and is preferably made of rubber that is so flexible that it can be inserted into the opening 6 or pulled out of it. The plug 23 protrudes far enough beyond the lower end of the bracket 1 so that the plug can be grasped and pulled out. As a lock, the plug has a U-ring 25 which fits into an annular groove 26 located in the lens bracket, which is formed when the soft metal is poured around the plug in the same way as all the plugs shown here

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the case is. The ring 25 also has an annular groove running around the stopper 23 in the middle between that on the bands. Thus, there can be a potty end, da · alaa somewhat shell-shaped · surface. 2k , old the convex surface 5 of the linea are brought into contact, while the opposite end can be used as a finger pull. The U-ring 25 then snaps the rubber out of the annular groove under the clamping force as soon as the plug is pulled back, but allows it to be reinserted into the groove to seal the bore 6 after the lens performance has been checked and continue the polishing process becomes necessary again, the bore 6 and reattached the lens to polish it at a different angle.

The plug 27 of Fig. 7 is inverted conically shaped, with the smaller end touching the lens. Diasar Stttpsel is with one with him from a part, ualaufemden Rib 28 provided, and when pouring in place and Stella he creates the same ring groove 26, via sla Tom dam in iig. 6th U-King shown is created. Here, too, you can use a soft rubber or a soft, pliable plastic use for the plug.

The plug 30 of Figure 8 has an inverted conical shape Shape, with the larger end in the lens bracket

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and rests against the convex surface of the lens. This stopper has a middle brown 31 and is provided with the same, one-piece rib 2β and also forms a corresponding groove 26 in the soft metal as soon as the metal is poured around the stopper.

When the plug 30 is subjected to pressure during the Grlea β and the lid to form the outer surface of the lens bracket is closed, then this plug tends to extend over a slightly wider surface than the one drawn to extend the ven dea plug in its natural Big revenue is earned. However, if the stopper is pulled out, then sr sioh susamaen press and release easily get out of the smaller end of the opening 6. This plug can be easily squeezed together if desired and put it back in place.

The plug 32 shown in FIG. 9 is enlarged Provided body having a with the convex surface of the lens in contact, shell-shaped surface 33. The body also has one with it consists of one part, circumferential rib 3 ^ and one finger pulling pegs 35 extending in the axial direction. In those cases in which the plug body is sold,

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as shown in FIG. 9 and in FIGS. 2 and k , the outer surface of the plug is bevelled around UB the drawbar 35 as at 36. This ring-shaped cut creates strength with respect to the surface of the molten metal and additional strength when producing the bore 6. The same external shape of the plug can also be found in FIGS. 11 and 13 as well as in FIGS. 2 and k. ™

The stopper 38 shown in FIG. 10 has a cylindrical body part _{U 1} which carries an annular rib k 2 which forms the annular groove 26 in its lens bracket. In addition, the plug is long frenug, so that it can be gripped by its lower inde and, including its sealing end kj , which has a smaller diameter, can be pulled out of the bracket.

Between the body Ui and its sealing end kj shoulder kO located "forms in the metal Linsenb" ok a complementary shoulder kk Thus, forming the shoulder, and the three cylindrical portions ^ 5, k6 and 47 interrupted axial over areas. Which together with the curved groove 26 represent labyrinth bands that contribute to the sealing of the opening υ when the plug is reinserted, *

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so that the line surface is kept dry and free of abrasive materials that are used to divide and polish the line surface. . " ^!

The same surfaces are also found in the FIGS. 11 and 13 shown plug constructions. However, the construction shown in Figure 13 is simply referred to as a reusable plug iu. Here the plug body 48 does not have a seal on the lens because the shoulders between the surfaces kk and k6, together with the groove 26 formed by the annular rib, are sufficient to seal the opening 6. Mm is not required; To put the whole plug or the same plug into the opening 6 that was used to shape the opening, unless it is to be expected that the lens will have to be sharply ground after the inspection of the lens. In such a case, it would be best to reinsert the original plug instead of the sttfpaele 48.

In the construction shown in Fig. 11, the plug 50 pan «generally has the same structure as the plug 38 in Fig. 10, with the exception that the outer drawbar 51 is smaller in diameter than the body 52 of the plug. Also, the hip 53 is in the center of the body portion 52 in this construction about half as long as the body

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cut, 52. This plug guide also has a conical or beveled part J6. on and the inner, axially extending sealing cup section 5k. With the short body section and the draw pin 51, which is smaller than the body section, this plug can be easily removed and any reciprocation of the draw pin is quickly transmitted to the body 52, so that it is compressed and slips out of the opening 6 . However, this plug can be used more quickly than some of the other embodiments already described because it has a relatively short body section. In doing so, however, it has the same sealing properties as those in FIGS. 10 and 13 plug shown.

In Fig. 12, a plug 55 is shown which is made of any suitable resin metal, for example Hessung, copper or can consist of a self-curing plastic. Because of his Hardness is the plug 55 with a U-ring 56 made of soft Provided rubber, which sits in the annular groove 26 of the opening 6, while the inner end of the plug is a sponge-like Has rubber or plastic elastomer material 57, which rests directly on the lens and when pressed in slightly bulges into the opening 6. This small seal 57 can be cemented or cemented to the inner end of the plug 55 be attached in other ways.

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Claims (1)

Patent application: Linsenboeic door mounting of lens blanks and method for jacking up lens blanks Claims t 1. Lens bracket for holding a lens blank which has a curved surface to which a lens blank can be attached to a correspondingly curved surface, characterized in that the line bracket (1) has a central opening (6) which opens at one end, see below the curved surface (4, 5) opens, in which a plug (b, 20, 23, 27, 30, 32, 38, k8, 50, 55) to protect the surface covering the central opening (6) a lens blank (1O) attached to the lens bracket (i) tightly and Patent Attorney Dipping. Martin LkM, Dipl.-Wirtodi.-lne. AmI Hammonn, Dipt-Phyi Sebas t MONCHIN 1, THIItSItNSTlASiI Il · ΤιΜμι! «« · Titi | iw Aiii tan Up · «/ i, ZmJ ₉ *. t <ww k Kf-Hr. SB4W PATENT ADVERTISER Often. ! UNHOLD SCHMIDT BATH ORIGINAL is removably held in the opening (6). 2. Linsenbook according to claim, thereby marked, that the plug (8, 20, 23 »27» 30, 32. 3 & »* &, 50, 55) on the end opposite the opening (6) protrudes from the lens bracket (i) and a handle part (22, 24, 27, 35, 41, 51), on which he can pull clay hand out of the opening. is cash. ' m 3. Linsenbook according to Anspruoh 1 or 2, characterized in that the plug (8, 20, 23, 27, 30, 32, 38, k &, 50, 55) in the middle swischen «one ends τοη an elastic sealing element (26, 25, 28, 3%, 42, 56) is surrounded, that there is an annular recess (26) in the bracket (ΐ) which frits the opening (6) in the middle iferor ends, and that the sealing element (26, 25, 28, 34, 42, 56) is arranged so that it sits sealingly in the recess (26) as soon as the plug is in the opening (6). I. k, lens book according to one of claims 1 to 3, characterized in that the plug (20, 23) and the opening (6) have an approximately cylindrical shape and the same diameter that the plug (2O, 23) at one end has a curved, resilient surface (24) which is shaped so that it is aligned with the congruent surface on the lens » 00984S / ÖS02 BATH ORIGINAL - Jr- IO blank (1O) is in contact as soon as the plug is in the Opening (6) has been inserted, and that the plug is slightly longer than the opening is deep. 5 · lens bracket according to claim 4, characterized in that the plug (8, 30, 35, k8, 51) at its end protruding from the opening (6) has a first section with a smaller diameter, which forms the handle part, and that at the end of the plug with the curved surface, which can be brought into contact with the congruent surface on the lens blank, a second plug section (* »3, 5 *) with a reduced diameter is located. 6. Lens bracket according to one of claims 1 | iis 31 characterized in that the plug (27, 3Q »55) to the. The opening (6) is designed in the shape of a truncated cone, and that the plug has an elastic surface at its one end, which can be brought into contact with the congruent surface of the line blank (io) when the plug is inserted into the opening (6). 7. Lens bracket according to claim 6, characterized by that the larger end of the conical opening (6) opens towards the curved surface of the lens bracket (i), that 000645/0502 BAD ORiQfNAt the larger end of the plug (30) in the larger Xnd " the opening is removable and that the plug (30) is elastic and at its said one end has a recess (31) which enables the plug is compressed when pulling out or inserting into the smaller end of the opening (6). 8. Lens support according to one of claims 3 to 6, characterized%, that the plug is made of an elastic material, and that the sealing element (21, 28, 34 53) having the plug of a part. 9. lens bracket according to claim 8, characterized in that the sealing element (26) extends in the axial direction Sciirauben-shaped extends around the plug (20). 10. Lens bracket according to one of claims 1 to 9, characterized in that the bracket (1) from "en has a flat" surface (9) which extends across a plane perpendicular to the axis of the central opening (6), whereby a reference surface is created which is used to check the prism of a lens blank (TO) attached to the bracket through the central opening (6) . 00Ö645 / Ö502 -> - ■■ · u 11. Procedure for checking a manufactured according to regulations! Lens located on a bracket according to claims 1 to 10, characterized in that the ocular vertex surface of the lens is located by opening (6) ^f . it is made accessible that the power and the prism * of the lens are measured through the exposed switching surface of the lens, and that the opening (6) located in the bracket is plugged to protect the above-mentioned lens surface before the lens revised only to remove any inaccuracies. BAD OFHGiNAL Blank page