Patent ID: 12197041

The known embodiment of spectacles shown inFIG.1comprises two lenses1,2. The lenses are supported by a frame, which comprises the following components:

Two arms3,4, a supporting part5, comprising a first section5.1, which extends over the upper edge of lens1, and a second section5.2, which extends over the upper edge of lens2, The sections5.1and5.2are integral with a nose bridge6located between them. The two arms3,4are each attached via a hinge7.1,7.2to the sections5.1and5.2of the frame5.

The spectacles according to the invention shown inFIG.2are schematically shown. They are embodied in a very light construction. The frame can essentially be embodied like that ofFIG.1. However, the components3,4,5.1,5.2, and6are produced from wire, for example from a titanium wire. Nose pads6,1,6.2are located on the nose bridge6.

The special feature of the spectacles according toFIG.2is a thread8made of plastic. This is guided around at least a part of the circumference of each lens. It can be inserted into a groove of the lens edge. See the enlarged sectional view ofFIG.2b.

Thread8can wrap around the relevant lens on its entire circumference, thus beginning at the point A and also ending again at the point A. Thread8can also wrap around only a part of the lens, however, for example beginning at the point A and ending at the point B. It is obvious that it is embodied in the same way in both lenses1and2.

FIG.3shows the decisive details of the invention. The plastic thread8can again be seen, specifically an end section thereof. This end section is shaped into a loop, comprising a longitudinal section8.1, a curved section8.2, and a second longitudinal section8.3. It could also be said that the end section of the thread8has a hairpin-shaped design. The end8.4of the thread8is located on the first longitudinal section8.1. A plug8.5has resulted here due to melting, which has a larger diameter than thread8on its remaining extension.

As can be seen, the loop of the thread8wraps around a frame part, for example frame part5.1or5.2. The wrapping begins at the attachment point A of the relevant frame part. It then extends—counterclockwise seen in Figure a—around the lens1to the attachment point B. A loop is again formed from the second thread end here, see above, analogous to the loop shown inFIG.3.

The attachment of the thread to a frame part by means of a loop is known. The fixing of the loop is difficult here. The loop is not to come apart during the assembly, and of course is also not to loosen independently after the assembly. The invention prevents this. A sleeve9is substantially provided for this purpose, the effect of which will be described hereinafter. The assembly of the plastic thread8on the metal frame part5.1is performed as follows:

First, the end8.4of the thread8is guided through the hole of the sleeve9. The end8.4of the thread8is not yet melted, so that it also does not have the plug shown inFIG.3. The end8.4of thread8is then guided around frame part5.1, wherein the loop shown inFIG.3results. Longitudinal section8.1of the thread8is then guided further, specifically through the sleeve9. The clear width of sleeve9is dimensioned in such a way that the two longitudinal sections8.1and8,3of sleeve9are closely enclosed and also press closely against one another. As can be seen, both longitudinal sections8.1and8.3extend some distance in parallel to one another.

The tightening of the loop now takes place. This can be carried out in that the sleeve9is displaced toward metal frame part5.1seated on the longitudinal sections8.1and8.3. However, the longitudinal sections8.1and8.3can also be displaced in relation to one another simultaneously, whereby the length of the thread available for wrapping around lens1changes. If the mentioned relative movement of the longitudinal sections8.1and8.3takes place according to the arrows C and D, a greater length is thus available for wrapping around lens1. It can be seen that the tension in the thread8as it wraps around the lens1can thus also be changed. The tension is to be as high as possible so that a contact pressure of lens1by means of the thread8against the metal frame part5.1is increased. If the tension is sufficiently high, this thus means that the lens is clamped between the thread8and the relevant metal frame part5.1. A very stable structure results in this way. The connection between the lens or the lenses and the frame is achieved without a screw connection. Therefore, machining of the lens is dispensed with, for example by applying holes or by screw connections. During the assembly, the close connection between sleeve9and the two longitudinal sections8.1and8.3due to the mechanical friction between the mention components ensures that the loop does not come apart during the assembly.

The mentioned plug8.5can be melted after the end8.4is guided through the sleeve9. The compaction9is used as additional security against loosening of the loop construction. The plug8.5prevents the thread8from slipping out of the sleeve9.

FIGS.4aand4bschematically illustrate the longitudinal sections8.1and8.3inside the sleeve9. As can be seen fromFIG.4b, the sleeve9has an oval hole in cross section, which is nearly completely filled up by the cross sections of the longitudinal sections8.1and8.3.

FIG.5again shows the two longitudinal sections8.1and8.3. Sleeve9is of lesser axial extension in this case; specifically in the present case it is a perforated disk or a ring.

The thread does not necessarily have to have a round cross section. It can also be hollow and is thus formed as a tube.

As described above, the plastic thread begins at a first point of the lens circumference, for example in the region of the relevant arm, and is fixed at a second attachment point, generally in the region of the nose bridge, on the metal frame part. However, it is also conceivable that the two attachment points A and B coincide. In this case, the plastic thread extends around the entire circumference of the relevant lens.

LIST OF REFERENCE NUMERALS

1lens

2lens

3arm

4arm

5frame

5.1frame part

5.2frame part

6nose bridge

6.1nose pad

6.2nose pad

7.1hinge

7.2hinge

8plastic thread

8.1longitudinal section

8.2bend

8.3longitudinal section

8.4end

8.5plug