ANSATZSCHRAUBE UND DEREN VERWENDUNG ALS SCHWENKACHSE FUER DAS SCHARNIER EINES BRILLENGESTELLS

摘要

The invention relates to a bearing screw including a cylindrical shank and a screw threaded end portion in which at least part of the shank has a diameter which is less than the over-all diameter of the threaded end portion and this part of the shank is provided with a sleeve of synthetic resin. The part of the shank which carries the sleeve preferably has a diameter which is substantially equal to the root diameter of the threaded end portion while the maximum diameter of the sleeve is preferably substantially equal to the over-all diameter of the threaded end portion. The invention also relates to a spectacle frame hinge in which a bearing screw having a sleeve of synthetic resin arranged on its shank is used as a hinge pin. In such arrangement the threaded end portion of the screw is screwed into a threaded hole formed in an outer ear of the interfitting ears of the hinge knuckles while the shank of the screw with the sleeve thereon passes through plain holes in the other ears. Preferably the maximum diameter of the sleeve is substantially equal to the diameter of these plain holes.