Patent ID: 8764521

Claim:
A grind-stone-mount of a honing head, in which a plurality of grind-stone-mounts each having a grind stone on its outer side are to be attached to a holder of the honing head expandably along a radial direction, the grind-stone-mount comprising: a support part disposed inside along the radial direction; and a grind part including said grind stone and disposed outside along the radial direction, wherein the grind part is swingably attached to the support part through a plurality of coil springs disposed at intervals along an axial direction of the holder, wherein an axis of each said coil springs extends in the radial direction from a central axis of the holder to outside of the holder, and wherein one said coil spring disposed at an intermediate portion of the grind part along the axial direction of the holder has a spring constant which is larger than spring constants of the other said coil springs.