Patent ID: 7144315

Claim:
A grinding wheel comprising: a ring-shaped wheel having a fixing section, a working section being formed along outer circumference of the fixing section, the fixing section of the ring-shaped wheel being formed with a shaft hole, two annular grooves being respectively formed on two sides of the ring-shaped wheel along the circumference of the shaft hole, multiple axially extending recesses being formed on inner circumferential wall of the shaft hole, the recesses extending from one side of the ring-shaped wheel to the other side thereof and communicating with the annular grooves; a first fixing cap which is a disc member having an inner face, the inner face of the first fixing cap having multiple projecting sections extending from the circumference of the inner face in the same direction, a free end of each projecting section being formed with a projection, the first fixing cap having a central seat body extending in the same direction as the projecting sections, the seat body being formed with a central through hole, fixed ends of the projecting sections and the seat body being simply connected by a connecting board, a space being defined between the projecting sections and the seat body; a second fixing cap which is a disc member having an inner face, the inner face of the second fixing cap having multiple projecting sections extending from the circumference of the inner face in the same direction, a free end of each projecting section being formed with a dent complementary to the projection of the first fixing cap, the second fixing cap also having a central seat body extending in the same direction as the projecting sections, the seat body being formed with a central through hole, fixed ends of the projecting sections and the seat body being simply connected by a connecting board, a space being defined between the projecting sections and the seat body; and a buffer member made of deformable soft material and fixedly positioned in the spaces between the first and second fixing caps, the buffer member being formed with a central through hole, a circumference of the buffer member being formed with multiple grooves extending through the buffer member from one side to the other side, a movable vane being defined between each two adjacent grooves, when the grinding wheel is rotated, the movable vanes of the buffer member leaning on the wall of the shaft hole of the ring-shaped wheel, whereby when assembled, the projecting sections of the first and second fixing caps are fitted into the recesses of the ring-shaped wheel from two sides thereof, the projecting sections abutting against each other with the projections of the first fixing cap extending into the dents of the second fixing cap, the seat bodies of the first and second fixing caps also abutting against each other.