| 摘要 |
An oscillating device comprises a body support on which opposed open bearing-receiving members are located, so that support-bearing members secured to mounting members of legs that are pivotally mounted onto a base are disposed in the bearing-receiving members and springs are mounted on spring-supporting bearing members secured to the mounting members of the legs to maintain the legs in a substantially vertical rest position and to move the body support along an arcuate path when it is moved from the vertical position in an oscillating motion.
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