| 摘要 |
A counterweight device comprises a first engaging groove formed at a counterweight, a second engaging groove formed at a body frame, a first engaging member projecting at the counterweight, which engages at the second engaging groove when mounting the counterweight, a second engaging member projecting at the body frame, which engages at the first engaging groove when mounting the counterweight. A locking device that locks the counterweight to the body frame when the first engaging member is engaged at the second engaging groove and the second engaging member is engaged at the first engaging groove.
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