Patent ID: 8459147

Claim:
A balance-adjusting member comprising: a rotor defining an axis, a ring member fixed to the rotor concentrically, a weight, a clip member which fixes said weight to said ring member, said ring member comprising: an outer side fit-in slot formed in an outer side of the ring member, the outer side fit-in slot having a length in a direction substantially parallel to the axis and a width in a circumferential direction of the ring member, an inner side fit-in slot formed in the inner side of the ring member in a position corresponding to the outer side fit-in slot, the inner side fit-in slot having a length in a direction substantially parallel to the axis and a width in a circumferential direction of the ring member, an outer side stop slot deeper than said outer side fit-in slot and formed in a direction of a circumference at a middle part of the outer side of the ring member, the outer side stop slot extending along an entire circumference of the ring member, and an inner side stop slot deeper than said inner side fit-in slot and formed in the direction of a circumference at a middle part of the inner side of the ring member, the inner side stop slot extending along the entire circumference of the ring member, said clip member comprising an elastic substance, whose motion in the circumference direction is regulated by the outer side fit-in slot and the inner-side fit-in slot, and being able to fit-in alternately to engage and disengage into said outer side stop slot and said inner side stop slot, said weight fixed to said clip member at the inner side of the ring member with the clip member fitted in the ring member.