Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Continuous rim mounting
Patent
1987-10-30
1989-01-24
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Continuous rim mounting
351154, 351128, G02C 100, G02C 504
Patent
active
047997818
DESCRIPTION:
BRIEF SUMMARY
The invention relates to eyeglasses, especially sunglasses.
Especially with sunglasses, there is a problem when buying them, namely which glasses are the right ones, i.e. whether the sunglasses are primarily to be used during week days in the summer, during vacation at the beach, or in the winter in the mountains with snow. The tint intensity (the degree of light absorption) of the glasses depend on this. As a compromise one sometimes uses photochromic glasses, the absorption level of which changes with the ambient brightness. But here, too, there are glasses with different basic tint and, hence, different maximum tinting capability. This is true also for glasses with ground lenses, when phototropic glasses are used here. Sunglasses frequently also use lenses with a mirror coating on the outside. Since the eyeglass frames in particular, depending on their design, are quite expensive, it is very expensive for the user to purchase several pairs of eyeglasses.
It is, therefore, the task of the present invention to create eyeglasses, especially sunglasses of the type mentioned in the introduction, in which the eyeglass frames may be used with different lenses as desired.
Since the lenses may manually be changed on the eyeglass frame, in simple manner, without the use of tools, it is possible for the user to purchase several different lenses for one frame, these lenses differing, for example, in their absorption levels (light, medium, dark, very dark). For example, it is possible to use light-sensitive phototropic lenses or mirror-coated lenses. The essential point is that the user may very quickly and at any time substitute one pair of lenses for another.
The structure of the invention is very practical as regards to handling and is very economical as regards to manufacture, as the bridge member which is present between the sockets anyway, may be used at once as a mounting bracket and as a slide. According to this structure, a one-piece slide-like component is provided which comprises the hook-shaped webs for both lenses. It is also possible to provide two parallel slide components, one for each lens. Handling is therefore especially simple for the user and may be performed even by unskilled users, since the slide-like part when held by one hand may simply be pushed upwardly by the thumb of the same hand; and in this open position, the respective lens may be removed by the user's other hand.
Preferably each lens is safely and immovably retained by three hook-shaped webs only and by an abutment surface for a marginal area of the lens at the slide or at the bridge.
In order to achieve safe locking or retention of the lenses in the closed position of the slide-like part under any circumstances, the slide-like part may be biased into its closed position by spring action, and may be moved into its open position against the bias of this spring. Thus, no particular manual motion is required to reach the closed position.
Advantageously, the bridge may be used not only as a guide for the slide-like part, but also for receiving the spring. The spring preferably is a pressure spring. The pressure spring may be stored in a recess of the bridge, entirely as regards its length and partly as regards its diameter, so that the spring may act on the slide-like part which may be positioned on the bridge. The pressure spring is maintained in its position by a cover plate. The slide-like part is guided between this cover plate and the bridge in a portion removed from the guide grooves of the bridge.
The plate, furthermore, is used as a stop for the slide-like part in its locked position and, by way of a protruding threaded pin penetrating into the bridge, it is used to maintain the displacement mechanism in its assembled state.
Further details and embodiments of the invention may be found in the following description, in which the invention is described and elucidated in more detail by way of the embodiment shown in the drawings.
FIG. 1 shows a partly exploded frontal view of sunglasses with a mechanism to replace the lenses accor
REFERENCES:
patent: 4176921 (1979-12-01), Matthias
Bovernick Rodney B.
Hormann Karl
Polaroid Corporation
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