| 摘要 |
A vibratory apparatus comprises a shaft mounted for rotation about an axis and having weight structure mounted thereon to effect vibration in response to shaft rotation. The shaft may be initially balanced or unbalanced. According to a first series of embodiments, secondary movable weight structure is mounted on the shaft for outward movement against spring action when the rotational shaft velocity reaches a predetermined magnitude to reduce vibration caused by the primary weight structure. In another embodiment, combined weight/spring structure is utilized for the same purpose. Various other types of springs may be used. In this manner the vibrational amplitude of the apparatus is caused to vary as a function of the rotational velocity of the shaft.
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