Patent ID: 7604191

Claim:
A grinder comprising: a spindle; a hollow base having a grinding chamber for accommodating said spindle, a ground powder outlet in communication with said grinding chamber, at least one inner thread extending around the inner side of said grinding chamber, and a top engagement portion; a grinding device, said grinding device comprising a grinding disk and a grinding base, said grinding disk being affixed to said spindle and suspending in said grinding chamber and kept spaced from said grinding base by a gap; a container mounted on a top of said hollow base, said container comprising a bottom opening, an annular bottom coupling flange extending around said bottom opening, an engagement portion extending from said annular bottom coupling flange for engaging the top engagement portion of said hollow base to prohibit rotation of said container relative to said hollow base, a hollow guide disk mounted therein and spaced above said bottom opening, an elastic member supported between said annular bottom coupling flange and said hollow guide disk, and a rotary cap rotatably coupled to said annular bottom coupling flange and fastened to said hollow guide disk, said rotary cap having a bottom side fixedly connected to said grinding base and at least one outer thread threaded into the at least one inner thread of said hollow base; wherein when lifting said container to disengage the engagement portion of said annular bottom coupling flange from the top engagement portion of said hollow base, said elastic member is compressed by said annular bottom coupling flange against said hollow guide disk, and said rotary cap is rotatable with said container relative to said hollow base to adjust the gap between said grinding base and said grinding disk.