End piece of a spectacle frame earpiece
OwnerWalter Bononiinventor
Life of this patent
Estimating the term…
Abstract
A spectacle frame earpiece has a flexible portion in the form of a rod, for adaption to the wearer's head, and a skin-soft sleeve composed of elastic material enclosing the flexible portion and extending to the end of the earpiece. A core in the form of a small plate is cast within the sleeve. The core is composed of substantially harder material than the sleeve. The core has a blind hole with a flattened cross-section for receiving and force-locking with a flattened cross-section at the end of the flexible portion of the rod.
Claims15
End piece of a spectacle frame earpiece having a metallic tang, a sheath of synthetic plastic material seated on said tang, said material being composed of silicone rubber having a Shore-D hardness of between 10-30 according to the DIN 53,505 standard, and the improvement wherein:
- the end of said tang has a flattened cross-section in the lateral direction with barbs directed away from said tang over a length of between 0.5-1. cm.,
- a very small synthetic plastic sleeve of flattened cross-section composed of substantially harder material is seated on said barbed region, said plastic sleeve has a blind hole with a flattened cross-section that accommodates said barbed region with contracting stress, the points of said barbs biting into said plastic sleeve at its inner surface,
- a small plate extends integrally on said plastic sleeve, said plate has a flattened cross-section approximately as long as said plastic sleeve and has at least one transverse orifice therein,
- said sheath surrounds said plastic sleeve and said plate, forming one coherent part which is pushed to a seating position on said tang,
- said tang is connected with said sheath inwards from said plastic sleeve, (viewed from the end of said tang) by an adhesive connection comprised of a primer on said tang and an adhesive on said primer.
In a spectacle frame earpiece, aving a flexible portion in the form of a rod, for adaption to the wearer's head, and a sleeve enclosing said flexible portion and extending to the end of said earpiece, said sleeve being composed of elastic material having a Shore-D hardness of between 10-30 according to the DIN 53.505 standard, said sleeve having a longitudinal recess for receiving said flexible portion, the improvement comprising:
- a core in the form of a small plate cast within said sleeve, said core being composed of substantially harder material than said sleeve, said core having a blind hole with a flattened cross-section for receiving and force-locking with the end of said flexible portion,
- at least the end of said flexible portion receivable in said blind hole of said core having a flattened cross-section.
Dependencies are inferred from the claim text.