| 摘要 |
A container is supported by a plurality of spring beams for oscillatory movement on an effective pivot axis offset laterally from a vertical center plane of the container, and a plurality of generally vertical coil springs cooperate with the spring beams to provide the container and the load therein with a resonant frequency of oscillation corresponding substantially to a predetermined excitation frequency. The coil springs are offset laterally from the vertical center plane of the container in spaced relation to the spring beams and are adjustable to provide for substantially maintaining the resonant frequency of oscillation with changes in the load. A cover member is positioned for exerting pressure on the load within the container and in one form is flexible with attached weights and in another form is substantially rigid and hinged to the container.
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