FI68327C - BAOGE FOER BIFOKALA LINSER - Google Patents

Description

68327

Frame for double power lenses Bäge för bifokala linser

The present invention relates to a frame for double-glazed spectacles. These glasses are known to have two lens areas with different focal lengths so that the person using them can read with the lens part at the bottom of the glasses and look at distant objects with the rest of the lens. These glasses are very suitable for reading and working at an example table.

However, the problem arises when a person has to move around his or her workplace, for example, in which case the lower part of the lenses, which has been ground for close-up viewing distance, hinders the detection of obstacles on the floor quite badly. The same 15 problem occurs when a person moves up stairs. The use of these glasses has proved to be particularly problematic in workplaces where a person has to work with a workplace that has to be reached upwards and sometimes moved from one workplace to another. An example of such work is, for example, electrical installation work. The usual solution to the problem has usually been the use of two glasses, one for working at close range and the other for moving. However, this has its own understandable disadvantages to working with. Another known solution to the above problem is disclosed in German Patent No. 243,843, which describes spectacles whose lenses are rotatable in their frame around their center. In this case, the close-up viewing area of the lower part of the glasses can be rotated to the upper part of the glasses, if necessary, so that working on an object above the eye level is effortless and the person does not have to tilt his head to an unnaturally rearward position. Moving around the workplace is also a hassle, as the foresight area in the lower part of the glasses can now be used to see downwards.

However, these glasses can be considered to have their own shortcomings. First, the structure of the glasses is limited to round lenses. Second, the lenses are subject to significant wear when rotated in their frames, which inevitably means a significant reduction in the service life of the glasses. However, the disadvantage caused by the use of glasses in working conditions, where the employee's hands become contaminated with considerable certainty, can be considered quite significant. When he takes the glasses off to rotate the lenses, due to his limited vision, he has to act in a way with the touch of a finger, causing the glasses to become dirty with considerable certainty, causing his own disadvantages to work.

These problems have been substantially eliminated by the spectacle frames according to the invention, the essential features of which appear from the appended claims.

The invention is illustrated by the accompanying drawing, in which

Figure 1 shows the glasses in the normal position of use, i.e. the close-up viewing area of the lenses at the bottom of the glasses, and

Figure 2 glasses in a position with the close-up viewing area 25 turned to the top of the glasses.

The glasses are shown schematically in the drawing to clarify the principle of the invention. The spectacle frame shown in the figures is otherwise in principle conventional, but the front of the straps 1, 1 'is provided close to the plane of the Lins-30 with a joint 2, 2' which allows the straps to rotate around this joint by about 180 °. In this case, the handles can be rotated from a position substantially perpendicular to the lens plane to a position 35 substantially perpendicular to the lens plane on the opposite side of the lens plane. This rotation causes the lenses to rotate 3 68327 m. relative to the brackets to a position where the close-up viewing area of the lenses will be as desired at the top of the glasses. The frames may have a conventional joint 3, 3 ', which allows the brackets to be pivoted substantially into the lens plane 5 for placement in the housing of the glasses.

Preferably, the joints 2, 2 'are designed such that when the brackets 1, 1' are in their positions perpendicular to the lens plane, i.e. the glasses are in their position of use, the joints 2, 2 'are locked against rotation.

When the handles are then turned slightly inwards from this perpendicular plane, the lock is released and the handles can be rotated around the joint 2, 2 '.

In order to make the use of the glasses more comfortable in both positions, the nasal saddle 4 can be made double-sided, whereby the retention of the glasses in the situation of use is improved. It is obvious that in the second position of use of the glasses, the curvature of the lenses will be in the wrong direction in some types of lenses, but this does not change the focal lengths of the lenses, and this fact has not been found to be relevant when using glasses.