| 摘要 |
The device for producing vibratory forces shown in the drawings comprises a pair of plates mounted on a structural frame. There are three rows of gears on each plate which are intermeshed so that all may be driven from a drive input to one of the gears in the central row. Drive means provide the input to the driven gear of each plate through one of the journals for mounting the plates on the frames. Weights are mounted eccentrically on each of the gears and are thus rotated synchronously between extreme outward and inward positions to produce, by centrifugal force, vibratory forces parallel to the planes of the plates. Means, operative through the other journals for pivotal mounting the plates, simultaneously and synchronously pivot the plates between aligned positions wherein the centrifugal forces are nullified and essentially no vibrations are produced and parallel positions wherein the vibratory forces are at maximum.
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