LENS AND PATTERN HOLDER

摘要

A lens and pattern holder for use with a grinding tool comprising a rotary grinding ring mounted in coaxial relationship with respect to a guiding ring of the same diameter. The holder comprises a solid body having a pair of opposite surfaces spaced apart so that the peripheries thereof respectively face the grinding ring and the guiding ring of the tool. A pair of pins projects upwardly from one of the opposite surfaces of the body for detachably connecting thereto a pattern having a peripherical edge extending away from the periphery of the one surface. Means consisting of another pair of pins or of a sticking pad, are provided on the other opposite surface of the body for detachably mounting thereon another pattern or a lens. In the latter case, visual means are also provided on the holder surface for properly positioning and a ligning the lens with respect to the pattern connected to the opposite surface of the body. In use, a finishing lens mounted on the other surface of the body can be used as a guide for shaping and finishing the peripherical edge of a blank pattern connected to the one surface of the body, such a shaping and finishing being obtained by pressing and rotating the finished lens and blank pattern against the guiding and grinding rings respectively. Alternatively, a finished pattern mounted on the one surface of the body can be used as a guide for shaping and finishing the peripherical edge of a lens or of a blank pattern, such a finishing being obtained by pressing and rotating the finishing pattern and the lens or blank pattern to be finished against the guiding ring and the grinding ring, respectively.