WO2012168313A1

WO2012168313A1 - Method for manufacturing curved spectacle frame parts

Info

Publication number: WO2012168313A1
Application number: PCT/EP2012/060722
Authority: WO
Inventors: Christoph Egger
Original assignee: Christoph Egger
Priority date: 2011-06-07
Filing date: 2012-06-06
Publication date: 2012-12-13
Also published as: DE102011077091A1; DE102011077091A8

Abstract

The invention relates to a method for manufacturing curved spectacle frame parts (3, 22, 24) with a defined material thickness distribution, comprising the steps: - casting curved molded sheet parts (1, 20), in particular from an elastomeric polyurethane plastic, in molds, the distribution of material thickness and curvature of the molded sheet parts being selected in such a manner that each spectacle frame part (3, 22, 24) can be cut out of a respective molded sheet part (1, 20) with the desired curvature and defined material thickness distribution, including an integral nose pad bridge, by contour cutting, and - cutting the spectacle frame parts (3, 22, 24) out of the molded sheet parts by contour cutting.

Description

Method for producing arched spectacle frame parts

description

The invention relates to a method for producing arched spectacle frame parts, in particular spectacle frame parts in the form of spectacle frames, which are to be combined with separately manufactured spectacle lenses, with a specific material thickness distribution and an integrated Nasenauflage- saddle, wherein the spectacle frame parts of a polyurethane plastic, preferably elastomeric polyurethane plastic, by Pouring be made. The invention further relates to a cast flat part made of polyurethane plastic as a semi-finished product for further processing to such a spectacle frame part.

From EP 1 555 566 A1 an elastic spectacles with a frame made of elastomeric polyurethane plastic is known. This known glasses is flexible overall flexible, so that they do not suffer damage when they z. B. falls accidentally on a hard floor or experiences a strong bending stress. The glasses can be put back into the normal use form after such a bending stress, without the need for special skills or aids.

The present invention aims, in particular, to produce frame parts for such bendable spectacles.

WO 2009/071279 A1 discloses a process for the production of parts made from polyurethane plastic, wherein these parts of the spectacle are molded ready for molding in appropriate casting molds.

It has been found in the known methods to be difficult and expensive, filigree structures, in particular the holding grooves or undercuts required for the reception of spectacle lenses in the manufacture of spectacle lenses. Provision of spectacle frames by casting. The precise shaping of an integrated nose pad saddle with an enlarged nasal contact surface has also proven to be relatively difficult in the known methods.

The present invention has for its object to provide a method of the type mentioned, which is for the production of bending elastic spectacle frame parts made of polyurethane plastic, as described, for. As described in EP 1 555 566 A1, is applicable and allows more versatile, especially filigree structures on the eyeglass frame parts.

To achieve this object, the invention proposes that the method comprises the following steps:

- Casting curved flat moldings of a particular elastomeric polyurethane plastic in molds, wherein the curvature and material thickness distribution of the flat moldings are selected so that a respective eyeglass frame part with the desired curvature and the specific material thickness distribution including an integrated Nasenauflagesattels by contour cutting from a relevant flat mold part separable is and

- Separate the eyeglass frame parts from the flat parts by contour cutting.

As Nasenauflagesattel here a region is designated, which rests on the intended use of a designed with a frame part of the type considered here glasses directly to the nose of the wearer. Viewed over the material thickness distribution of the frame part, the nose pad saddle has a region of greater material thickness that forms nose pad areas than adjacent lateral areas thereof.

The invention is based on the idea, three-dimensionally preformed, ie not plane-parallel flat parts with a respective predetermined to- pography of the polyurethane plastic to pour, in such a way that the produced spectacle frame parts with their desired curvature and their specific material thickness distribution are already created or embedded in the plate parts that they by cutting out with a linear cut along its contour lines from the plate parts (flat moldings) are detachable, without - apart from any Oberflächenfinishing - a material removal on the surfaces (surface sides) of the flat parts or plate parts is required. Such contour cutting thus comes with cutting surfaces transverse to the surface sides of the flat moldings to separate out the desired spectacle frame parts. Grooves or undercuts for receiving spectacle lens edges can then be formed in a simple manner by material removal in a post-processing process, for example by milling.

The separation of the spectacle frame parts from the flat parts by contour cutting is preferably carried out by at least one of the following methods:

Contour milling,

Laser cutting,

Water jet cutting,

Punching or

Saws.

The term contour cutting should thus also include contour milling as the preferred separation method in the context of this application.

An essential advantage of the method according to the invention is that the casting of flat moldings in the form of three-dimensionally preformed plate parts having a specific curvature and thickness distribution is considerably simpler than the direct, ready-to-use casting of spectacle frame parts made of polyurethane plastic with a corresponding casting method. Also, the molds for the flat moldings are usually easier and cheaper konsten to produce than molds for completely shaped spectacle frame parts.

A particular advantage of the method according to the invention further consists in that flat moldings can be shaped so that either different models of spectacle frame parts can be separated therefrom, so z. B. different eyeglass detection models by a corresponding design of the relevant contour section is selected.

According to one embodiment of the invention, a coherent spectacle frame with integrated nose bridge and nose pad saddle is produced as a one-piece spectacle frame part. The required for the formation of the nose bridge and the nose pad saddle thickness is also applied in the non-constant thickness distribution of the cast flat part so that, moreover, the contour cut is sufficient to form the nose bridge and Nasenauflagesattel. The adjoining the nose bridge laterally outside areas of the spectacle frame are usually thinner than the nose bridge area, but also their thickness distribution in the cast flat part is already created so that the contour section is sufficient to substantially completely fertigzuformen these spectacle sensing areas.

Further frame parts which are to be formed from corresponding PU flat-section parts by contour cutting are preferably eyeglass temples, it being possible for a number of, in particular also left and right temples, to be detachable from one and the same flat part.

Preferably, all frame parts of a pair of glasses are manufactured in such a way and then assembled to the complete spectacle frame. Thereafter, the use of the lenses takes place. These preferably also consist of a polyurethane plastic, which should be an optical, non-fading polyurethane. In the context of the invention it can be provided that even the lenses are integrated in the cast flat part, in particular already in the spectacle frame parts in question.

A variant of the invention makes it possible to produce a complete spectacle frame from the spectacle frame and spectacle arms by separating it in one piece from the respective flat part. This idea is expandable to the production of a complete one-piece glasses including the lenses.

If necessary, it may be expedient for design reasons to subject the spectacle frame parts separated out of the flat shaped part to surface finishing.

The invention further relates to a curved flat part according to claim 14 as a semi-finished product for further processing to the spectacle frame part. A further development is specified in claim 15. The flat moldings can be advantageously and inexpensively produced in large quantities on stock, and then further processed as needed, even to different models.

The invention will be explained in more detail below with reference to the figures.

FIGS. 1a and 1b show, from various perspectives, a cast polyurethane flat-shaped part according to the invention, from which a spectacle frame with a desired curvature and thickness distribution can be removed;

2 shows the flat mold part of FIGS. 1a and 1b with eyeglass frames to be cut out with drawn contour lines with integrated nose bridge and integrated nose pad saddle;

Fig. 3 shows the flat part in a sectional view with the in Fig. 2 at III indicated section line;

Fig. 4 shows a further flat mold part, which serves for the production of eyeglass temples;

5 shows the flat shaped part from FIG. 4 with contour lines of a left eyeglass temple and a right eyeglass temple drawn in;

Fig. 6 shows in a perspective view obliquely from above from the flat molded part of FIG. 1a, 1 b, 2, 3 herausgetrennte spectacle frame and

FIG. 7 shows the spectacle frame from FIG. 6 with eyeglass temples attached thereto from FIG. 5 in a further perspective view.

The flat mold part 1 shown in Fig. 1a - 3 has been produced as a 3D sheet member with a certain topography after a casting process, as he z. As described in WO 2009/071279 A1. The plate member 1 consists of an elastomeric, preferably aliphatic polyurethane plastic and has a curvature distribution and material thickness distribution, which allow, for. B. the drawn in Fig. 2 and Fig. 6 eyeglass frame 3 with integrated nose bridge 5 with nose pad saddle by cutting out along the contour lines 7 and 8 from the plate part 1 herauszutrenen. In this case, the spectacle frame 3 with integrated nose bridge 5 and nose pad saddle 14 has the curvature structure and thickness distribution applied in the plate part 1, as desired for the spectacle design. It should also be noted that deviating contour lines can be selected from the contour lines 7, 8 that can be recognized in FIG. 2 in order to separate out another spectacle-capturing model from the same flat-shaped part 1. This is indicated by the dashed contour lines T and 8 'in FIG. 2. This shows the design flexibility of the method according to the invention. It can thus be used for the production of different glasses models same flat moldings 1, which is also advantageous from a cost point of view. As already mentioned, the separation of the spectacle frame part 3 from the flat part 1 is preferably carried out by contour milling. Other suitable contour cutting methods can be used to separate the spectacle frame part 3 from the flat part 1, wherein the separating cut along the contour lines 7, 8 with cut surfaces transversely (possibly obliquely) to the extended plate surfaces (surface sides) 9, 11 of the plate member 1 in the respective Area is done.

With 19 Halterungsausnehmungen are referred to in Fig. 2, which serve to fix the flat part 1 during contour cutting.

From the sectional view of FIG. 3 is clearly visible that in a central region of the flat molded part 1 is a material thickening 13 with a certain material thickness distribution. From the area of this thickening 13, the nose bridge 5 (see Fig. 2) and the nose pad saddle 14 (see Fig. 7) are cut out by contour cutting.

From the angled regions 15 of the flat molded part 1 fastening lugs 30 are formed for the subsequent connection of eyeglass temples (cf., Fig. 5 - 7) to the eyeglass frame 3.

Fig. 6 shows the in Fig. 2 by the contour lines 7, 8 indicated eyeglass frame 3 after separation from the flat part 1 by contour cutting along the contour lines 7, 8, wherein Fig. 6 is a perspective view of the eyeglass frame 3 with a view from obliquely on top of the the face of the subject wearer facing back 18 is. Fig. 7 shows the eyeglass frame 3 with it already hinged temple clips 22, 24, the z. B. have been cut out of the flat part 20 of FIG. 5.

14 is designated in FIGS. 6 and 7 of the nose pad saddle. The Nasenauflagesattel 14 is characterized in that it has also been formed from the region of the material thickening 13 by contour cutting, which automatically Nasenauflageflächen 16 have arisen, according to the invention between the front 17 and the back 18 of the spectacle frame 3 have a greater extent than the laterally adjacent thereto adjacent spectacle frame areas 26. If the glasses in question with the version 3 in the intended manner placed on the nose of a spectacle wearer, so are the widened Nose support surfaces 16 of the saddle 15 directly to the nose of the wearer on to support the glasses.

Therefore, a pair of spectacles made of a spectacle frame according to the present invention does not need separate nose pads or the like. This provides an improved wearing comfort of the spectacles and a considerably simplified production. Furthermore, the user does not have the problem of exchanging nose pad saddle elements, such as the typical pads known from the prior art.

The invention provides the possibility of simplified production of spectacle frames and other spectacle frame parts from the polyurethane plastic, which is known to be difficult to handle, in such a way that the spectacle frame parts can obtain filigree structures. The manufacturer can produce the flat parts by a casting process in larger numbers on stock. Finally, he can use this supply of flat moldings to form different spectacle-gripping models, which differ in the course of their respective contour lines (compare 7 and 8 as well as T and 8 "in Fig. 2).

After the separation of the spectacle frame 3, this undergoes a groove formation in a post-processing step, preferably groove milling on the inner contour line 8. The respective spectacle lens can later be inserted into this groove, which preferably also consists of an elastomeric polyurethane plastic.

Dashed lines 28 are shown in FIGS. 6 and 7, along which form fine grooves for receiving the still missing spectacle lenses, in particular to be milled.

The method according to the present invention allows the production of very filigree spectacle frames.

Fig. 4 shows another flat molded part 20 of molded polyurethane plastic. The flat mold part 20 is used for the production of temple clips whose contour lines are shown in Fig. 5 in the flat mold part 20. 5 shows that at least one left eyeglass temple 22 and at least one right eyeglass temple 24 can be separated out of one and the same flat mold part 20 by contour cutting, preferably contour milling.

Claims

claims

1. A method for producing arched spectacle frame parts (3, 22, 24) with a certain material thickness distribution, comprising the steps:

- Casting of curved flat moldings (1, 20) of a particular elastomeric polyurethane plastic in molds, the curvature and material thickness distribution of the flat moldings are selected so that a respective spectacle frame part (3, 22, 24) with the desired curvature and the particular Material thickness distribution including an integrated Nasenauflagesattels (14) by contour cutting from a respective flat mold part (1, 20) is detachable, and

- Separate the spectacle frame parts (3, 22, 24) from the flat parts by contour cutting.

A method according to claim 1, wherein the flat moldings (3, 22, 24) are three-dimensionally shaped plate parts without holes.

Method according to claim 1 or 2, wherein the separation of the spectacle frame parts (3, 22, 24) from the flat shaped parts (1, 20) is carried out by at least one of the following methods:

Contour milling;

Laser cutting;

Water jet cutting;

stamping;

Saws. Method according to one of the preceding claims, characterized in that the flat moldings are dimensioned and shaped so that alternatively different models of a frame part from a respective flat mold part (1, 20) are separable and that from the same flat moldings frame parts of different models are cut out by contour cutting.

Method according to one of the preceding claims, wherein a coherent spectacle frame (3) with integrated nose bridge (5) and nose pad saddle (14) is produced as a one-piece spectacle frame part.

6. The method according to claim 5, wherein in a finishing step, lens mounting grooves in the spectacle frame are shaped, in particular milled.

7. The method according to any one of the preceding claims, wherein as Brilen lenrahmenteile eyeglass temple (22, 24) are produced.

2o 8. The method according to any one of the preceding claims, wherein from a single flat mold part (20) a plurality of temples (22, 24) are separated out.

9. The method of claim 8, wherein from a single flat molded part

25 (20) at least one left eyeglass temple (22) and at least one right

Temples (24) are cut out.

10. The method according to any one of the preceding claims, wherein all the frame parts of a pair of spectacles according to the method according to one of

30 claims 1-8 are produced and then assembled into a complete spectacle frame.

11. The method according to any one of claims 1 to 4, wherein a complete Bril lenrahmen from eyeglass frame with integrated nose bridge and nose pad saddle and eyeglass temple is one piece removed from the respective flat mold part.

12. The method according to any one of the preceding claims, wherein the separated out of the flat parts spectacle frame parts are subjected to a surface finishing.

Method according to one of the preceding claims, wherein the molds are made of nonpolar thermoplastics, in particular polypropylene or polyethylene.

Arched, in particular cast flat molded part (1) of a preferably elastomeric polyurethane plastic, which has a specific curvature structure and material thickness, which are selected so that at least one spectacle frame part (3) of certain shape by contour cutting from the flat part (1) is essentially ready to be cut out, wherein the detachable spectacle frame part (3) is a one-piece spectacle frame (3) with integrated nose bridge (5) and nose pad saddle (14).

15. A curved flat molding (1) according to claim 14, wherein it is shaped so that optionally different shaped models of the Brillenrah- menteils (3) can be separated by contour cutting.