| 摘要 |
PURPOSE: A hinge structure for a single frame lens grinder is provided to form a hinge between a base plate and a rotation plate as a ball and a groove to reduce friction force by the pivotal motion of the ball and the rotation plate. CONSTITUTION: A single frame lens grinder is composed of a hollow housing having a larger diameter(51a) and a smaller diameter(51b), a ball(54) inserted into the larger diameter with protruding toward the smaller diameter at one side, a compressed spring(55) formed at a rear side of the ball and supporting the ball, and a cap(56) engaged into the larger diameter of the housing to support the compressed spring. A ball hinge(50) passes through a base plate. A curved groove corresponds to the ball at both sides of a rotation plate corresponding to the ball hinge.
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