Importance

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Abstract

A structure of grinding medium controllable in shape and specific gravity and comprising a housing, a cover, a spring and a core member is disclosed. The housing includes a head and a stem having a central cavity. The spring is fitted over the stem to form cutting blades for grinding/cutting. The spring can be formed into the shape wherein the thread on one side is close while on the other side is open, and the sectional shape of the spring can be various; hence the medium structure can have ideal blade contours in favor of grinding efficiency. The cover engages the cavity of the stem to form a sealed receiving chamber for positioning the spring, and the receiving chamber with a given volume formed between the cavity and the cover receives a core member or keeps empty. Therefore, specific gravity of the structure is under control and approach that of grinding liquid. So that the structure can pend at a suitable position in the grinding liquid, and chance of collision between the structure and the workpieces to be ground increases to increase efficiency of grinding and cutting.

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First Claim