DE2717967A1 - SAFETY GLASSES - Google Patents

Description

Safety glasses are created that have disposable lenses. The latter can get through can be exchanged by the user without the use of tools. The lenses are with protrusions provided on their circumference, which by applying finger pressure in corresponding slots in the edges of the glasses frame can be engaged and disengaged.

According to the prior art, it is common to use a plastic To provide the glasses frame with the lenses in that the frame is heated and sufficiently stretched, in such a way that the chamfered lenses can be fitted into the recessed edges of the frame. For this Special equipment and trained personnel are required, both of which are usually not available where the Lens replacement is required. Furthermore, any such lens replacement is a tedious and time-consuming job, as a result of which work delays arise where safety glasses have to be worn.

It is known in the art to address these problems have become conventional beveled lenses with the application of finger pressure on the edges of the plastic ones Snap eyeglass frames into place; however, optimal results have not been achieved here.

The usual beveled recess is used for those receiving the lens Rims of the prior art eyeglass frames are omitted, and instead they are replaced with a L-shaped indentation opening towards the front which freely accommodates the full diameter of the beveled lenses. the Lenses are locked into place via retaining projections which are formed as one-piece parts in the lens rims.

Every time the lens is removed and replaced, it is held in place Projections undergo significant stress in two ways, firstly by the sharp edges of the bevel of the Lens, which is removed and exchanged, and secondly through the pointed edges of the projection of the exchange lens. Abrasion

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burst and cracking of the retaining projections, as long as they are not completely broken out of the frame, lead quickly leads to the fact that the spectacle frame is no longer able to accommodate the lenses in the correct way. Thus, the intended easy handling and the economic advantage of easy replacement of the damaged lenses essentially destroyed by the fact that the glasses frames only have a short lifespan.

An object of the invention is thus to carry out the usual time-consuming and costly operations to avoid heating and stretching of the spectacle frame edges, which are required when replacing damaged lenses, and In particular, to improve currently used arrangements for the exchange of lenses by means of a snap-in operation under finger pressure. The task here is that a safety lens system is created in which the removal and the Replacement of the lenses can only be accomplished with finger pressure, but without excessive abrasion and / or other Damage to the more expensive components of the eyeglass frame occurs, as well as abrasion and / or damage in connection with the removal and replacement of the lenses is preferably carried out in each case on the already damaged lens. Through this a long-term service life of the glasses frame is achieved, and it becomes economically feasible for safety glasses more expensive and better quality and better fitting Provide eyeglass frames.

Another object of the invention is to to achieve simple, quick and economical removal and replacement of damaged lenses in safety glasses, any abrasion and / or other damage to the parts substantially during removal and replacement of the lenses occur entirely, if not at all, on the disposable lenses and not on the more expensive ones eyeglass frames to be reused.

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These objects on which the invention is based are achieved according to the invention solved in that disposable and made of plastic ophthalmic lenses are provided on their periphery Have fastening projections that with ordinary finger pressure can be snapped into and out of corresponding slots in the lens rims of specially provided spectacle frames. Mediating With this arrangement, scratched, splashed, broken or otherwise damaged lenses can be replaced immediately can be accomplished by the user without the need for tools, special equipment or training, and this in the least possible time. These slots, which make it no longer necessary according to the state of the art Technique provided and the lens holding projections to be provided, signs of wear and tear on the glasses frames had now stopped and caused an unusually long time Lifespan of the glasses frame regardless of the frequency of lens replacement.

An embodiment of the invention is shown in the drawings and v; is described in more detail below. Show it:

Figure 1 is a broken front elevational view of a preferred one embodiment of the invention;

Figure 2 is a front elevational view of one type of lens for use in the eyeglasses of Figure 1;

3 is an enlarged cross-sectional view taken generally along line 3-3 of FIG. 1 with an intermediate portion for clarity Representation has broken away.

The glasses 10, see FIGS. 1 and 3, have the front part 12 with the disposable lenses 14, which can easily be used in accordance with the invention Way can be removed from the front part 12 and replaced. The size, shape and general styling of the front piece 12 are not the subject of the invention, which relates to the special design of the lens edges 16 of the frame 12 and the Lenses 14 refers which are detachably fitted therein.

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The nose portion 18, the end portions 20 and the rims 16 can be any have suitable size and / or shape and are preferably heavier and: or more rigid than conventional ones Spectacle frames is the case. The front part 12 is provided with a side bracket 22 which is attached to the by means of a hinge End portion 20 is hinged and extends rearwardly to hold the entire assembly in the usual manner on the face of the user.

The front part 12 can be molded to the appropriate shape and size, shaped, punched and / or machined. The finishing treatment usually includes an all-in-one buff Polishing drum and / or by means of a polishing disk. The front part 12 can be made of cellulose acetate, butyrate or propionate and the Lenses 12 can be made of a polyacrylic (e.g. plexiglass), polypropionate or plycarbonate with optical quality. Naturally Other materials known in the art of eyeglass frames and lenses can also be used.

With regard to the structural details of the spectacle frame 10 results With reference to Figures 1 and 3, the edges 16 of the front part 12 each with an inner, the lens receiving Recess 24 which is generally L-shaped in cross-section. At selected locations around the Recess 24 around the frame is recessed in the form of slots 26, in the present case three such slots in each edge 16 are shown. It goes without saying that a larger and smaller number of slots 26 can also be provided. With particular reference to Figure 3, it will be seen that the slots 26 have a V-shaped configuration in cross-section. While various other shapes can be used, this V-shape is preferred for reasons to be explained below.

The disposable lenses 14, which are in the front part 12 of the eyeglass frame are to be used, one of which is shown separately in FIG. 2, preferably have a meniscus shape or other concavo-convex cross-sectional configuration, the circumferential shape and size being such that they freely fit into the

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L-shaped recess 24 fitted against the shoulder 28 rest, as shown in Figure 3 by the fully drawn Lines is reproduced. At the beginning of the lens 14, which corresponds to the positions of the slots 26 in the front part 12 of the spectacle frame correspond, projections 30 are arranged with a generally V-shaped, i.e. tapered configuration, see Fig. 3. These projections are integral extensions of the lens 12 and hold the lens in place once they are in the corresponding slots 26 of the front part 12 of the spectacle frame are inserted.

The tapered outer configuration of the projections 30 allows a slight insertion of the same into the slots 26. Once the lens is centered in the recess 24, a leads against the finger pressure applied convex side thereof adjacent one or more of the projections 30 to "snap" them in the front part 12 of the spectacle frame. Similarly, removal of the lens to replace it therewith can be accomplished brought about that the fingers against the concave or posterior surface of the lens adjacent to one or more of the projections 30 are pressed. This means that it can be splattered, cracked, scratched, broken or otherwise damaged Lenses 14 can be removed, discarded and replaced quickly and easily without the application of heat, Tools and / or a special introduction required, and in the least possible time.

The front edges 32, see FIG. 3, of the slots 26 are rounded in order to facilitate the entry of the projections 30. These rounded edges are supported by a substantial thickness of edge material, so that the lens projections 30 substantially experience all wear and / or damage that may be due to their resistance to an entry into the slots 26 or by removal therefrom result. Thus, in the front part 12 of the spectacle frame a great variety, if not an unlimited number

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on lenses can be exchanged without it becoming a merlical one Wear occurs or the ability to hold the lenses in place is impaired.

The dashed line of the circumference of the lens 14 after FIG. 3 illustrates one manner in which the lens can be inserted into the rims 16. By having one edge of the lens 14 opposite a preselected protrusion 30, e.g., the top edge of lens 14, partially or completely into the L-shaped recess 24 is introduced, due to ain adjacent to the opposite projection exerted finger pressure, such as for example, indicated by arrow 34, that the projection 30 is pressed into its corresponding slot 26.

It is provided that the users of the glasses 10 receive a supply of replacement lenses so that the damaged lenses can be replaced at the work site. Furthermore, the long service life of the front part 12 of the spectacle frame means that spectacle frames of better quality, better fitting and more comfortable to wear than the less expensive ones otherwise intended for this purpose and not having a short lifespan are provided without any economic impact your worse products.

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Claims (8)

PATENTANWALT D-I BERLIN 33 April 19, 1977 MANFREDMIEHE FALKENRIED 4 r% - ι / -η. · ΛΚ ^> *> .- Telephone: (030) 8311950 Diplom-Chemiker 2 7 1 7 QR 7 Telejr.mme: INDUSPROP BERLIN * "'' ^ υ 'Telex: 0185443 US / 02/2327 AO-3111 AMERICAN OPTICAL CORPORATION Southbridge, Mass. 01550, USA Safety glasses patent claims 1. Safety glasses with manually exchangeable lenses, characterized in that the front part (12) of the glasses frame a pair of rims (16) having inside a recess (24) for receiving a lens (14), the recess (24) a preselected circumferential configuration in each edge (16) and has a plurality of spaced-apart slots (26) extending from the recess (24) from extending into the edge (16), the lens (14) can be manually inserted into each of the edges i16), the lens (14) has a circumferential shape and has a size which substantially corresponds to the configuration of the recess (24) and continues to vary radially extending projections (30) are provided at locations corresponding to the locations of the slots (26) in the recess (24), the Projections (30) can be inserted into the slots (26) securing the lens (14) in the safety glasses (10). 2. Safety glasses according to claim 1, characterized in that g e k e η η - ζ e i c h ne t that the recess <24) in each edge (16) one opening with a generally L-shaped configuration at the front Side of the front part (12) of the spectacle frame and is substantially at right angles inward with respect to the Edge (16) adjacent to the rear side of the front part (12) in the form of a shoulder (28) extends against which the lens (14) 709848/0763 27179Γ7 when fastened in place in the glasses (10) to rest can be brought to earth. 3. Safety glasses according to claim 1, characterized in that they extend into the edges (14) Extensions of the slots (26) have a V-shaped configuration. 4. Safety glasses according to claim 3, characterized in that the projections present on the lenses (14) (30) are bevelled so that they fit deeply into the slots (26). 5. Safety glasses according to claim 1, characterized in that g e k e η η - ζ e i c h ne t that the slots (26) and corresponding projections (30) are present on the lenses (14) in each case in a number of at least two. 6. Safety glasses according to claim 1, characterized in that the lenses (14) made of an inexpensive plastic material are made. 7. Safety glasses according to one of the preceding claims, characterized in that the lens (14) in the form a concavo-convex main body is present and a plurality of projections formed integrally therewith extend therefrom (30) extends. 8. Safety glasses according to claim 7, characterized in that the projections (3O) are designed bevelled are. 7Π9848 / 0763 - 3 -ORIGINAL INSPECTED