| 摘要 |
<p>The invention relates to a system for permanently fastening a safety chain or string onto the arm of eyeglasses. The system prevents the string from slipping while allowing the arm to be placed with ease around the contour of the ear. The part (2) is crimped one-thirds of the way along the length of the arm, and is prevented from slipping by a steel cable of 8/10 in diameter, used as a crimp for the part (2) and having a tensile strength of eighteen kilograms. The part consists of a base (2) crimped by a cable onto the arm of the eyeglasses. The crimping is effected with a special multi-purpose clamp. Parts (2 and 4) are independent of one another and are joined by a screw system. The user can therefore change the string or chain as desired, for reasons of style or wear and tear of the string or chain. The system disclosed in the invention is especially intended for use in fastening strings or chains onto the frames of prescription eyeglasses or sunglasses.</p> |
