US1304850A - John brisacher - Google Patents

Description

1. BRISACHER. MEANS FOR TIGHTENING EYEGLASS LENSES.

APPLICATION FILED FEB. 10. I9I9.

1,304,850. Patented May 27, 1919,.

.lnventoz: QM

JOHN BRISAGHER, OF TORONTO, ONTARIO, CANADA.

MEANS FOR TIGHTENING EYEGLASS-LENSES.

Specification of Letters Patent.

Patented May2'7, 1919.

Application filed February 10, 1919. Serial No. 276,042.

To all whom it may concern:

Be it known that I, JOHN BRISACHER, a citizen of the Republic of Switzerland, and resident of the city of Toronto, county 01": York, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Means for Tightening Eyeglass-Lenses, as described in the following specification and illustrated in the accompanying drawings, that form part of the same.

The principal objects of this invention are, to eliminate the disagreeable conditions of loose eye glass lenses, and to provide a means whereby the lenses may be effectively tightened after having become worn.

The principal feature of the invention consists in providing various thicknesses of packing strips for insertion between the arched portion of the bridge strap and the lens to take up the wear in the lens or lens holding pin;

In the drawings, Figure l is an enlarged elevational view of a portion of an eye glass bridge, lens strap and lens showing the application of my improved form of adjustment.

Figs. 2, 3 and 4 are enlarged perspective views of the graduated forms of adjusting strips to be used in carrying this invention into eifect.

It is a well known fact that the lenses of rimless eye-glasses work loose in the fitting through the strains to which they are subjected and it is erroneously considered that the arched portion of the lens strap becomes bent or spread in such a manner as to allow the lens to loosen, but what actually takes place is that the constant straining between the lens and the holding strap works the pin, which extends through the hole in the lens, so as to pulverize the glass at the edges of the hole and gradually enlarge the hole, thus loosening the lens.

It has been the practice with Opticians when lenses become loose to bend the points of the arched portion to meet the edge surface of the lens and thus tighten the glass and it has been proposed in the prior art to insert spring members which would automatically take up such wear. Screw adjustments have also been proposed but none of these, however are found to be reliable, as it is found in practice that an arched connection is necessary to the proper maintenance of a secure holding.

In carrying my invention into effect, I provide a series of thin metal strips which are shown in the accompanying drawings very much exaggerated. These strips areof several thicknesses and are suitably numbered, such as 1, 2 and 3, etc., which numbers indicate the relative thickness.

Each of the strips is provided with two pairs of lugs a which are adapted to engage the sides of the portion 6 of the bridge B, one pair of said lugs fitting each side of the strap 0 which embraces the lens D.

The strips A are placed between the lens and the member I) and take up the actual wear in the hole through the lens or on the pin 0 which extends through the lens. When further wear occurs a thicker member A can be used. I

This arrangement of a series of packing strips of different thiclmesses allows the optician to fit the lens in a repair job assecurely and solidly as in fitting a new lens.

What I claim as my invention is 1. Means for tightening eye glass lenses, comprising, a thin packing strip adapted to be inserted between the lens and the bridge strap to take up the wear, said strip having two pair of laterally turned lugs arranged at each side of the bridge strap to hold the strip in place.

2. Means for tightening eye glass lenses, comprising, a series of thin metal strips of graduated thicknesses adapted to be placed between the lens and the bridge and having side holding lugs to secure them in position.

JOHN BRISACHER.

- Copies of this patent may be obtained for five cents each, by addressing the Commissioner out Patents,

Washington, D. C.

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