| 摘要 |
A dumb bell comprises mainly a hand grip unit, a sound reproducing unit, and a weights unit. The hand grip unit consists of a lower case body and an upper case body, which are of hollow construction and are made of plastic material by injection molding. The lower case body is provided therein with battery mounts, circuit mounts located in one connection portion thereof and a circular tubular column located in the other connection portion thereof. The connection portions are respectively provided with thread. The sound reproducing device comprises batteries, conductive pieces mounted in the battery mounts, a sound reproducing circuit board mounted in the circuit mounts, and a speaker mounted on the circular tubular column. The sound reproducing device is capable of producing the sound of music or exercise commands. The weights unit contains two hollow plastic ball bodies of identical construction, with each ball body having a closed end and an open end with a circular hole which is provided therein with thread and a partition having a through hole disposed therethrough. The weights are placed inside the hollow plastic ball bodies.
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