Eyeglass frame comprising a screw joint which is protected from

Details Eyeglass frame comprising a screw joint which is protected from Eyeglass frame comprising a screw joint which is protected from

1989-11-20

1991-04-30

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Temples

351153, 351 90, G02C 514, G02C 522, G02C 108

Patent

active

050112740

ABSTRACT:
This invention relates to an eyeglass frame comprising members, particularly hinge members, which are connected by a screw joint which is protected from becoming loose. The screw joint comprises a single metal part, which consists of a screw, which does not tend to become seized and to become clamped in the relatively movable hinge eyes. Because plastic parts are not required in the joint, the screw may remain installed during soldering work. This is accomplished in that the screw has a conical head portion which tapers with an included angle of 20 to 40 degrees, preferably 30.degree., and when the screw has been screwed into the frame the head of the screw extends in a conical opening in a member of the frame and in said opening defines with said frame member a clearance angle of 1 to 3 degrees and a clearance space axially adjoining the head. In such a joint the screw can firmly be tightened so that the high friction will prevent the screw from becoming loose spontaneously. On the other hand, the application of an excessive pressure per unit of area to the hinge eyelets will be avoided.

REFERENCES:
patent: 2833325 (1954-02-01), Laisy
patent: 3427681 (1969-02-01), Smith, Jr.

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