| 摘要 |
A pusher apparatus comprises a track, a pusher mounted on the track for movement along the track; a spring mounted on the pusher for urging the pusher along the track; an axle rotatably mounted on the pusher; and at least one wheel fixed to the axle for positively engaging the track. In one aspect of the invention, two of the said wheels are fixed to the axle to avoid canting of the pusher as it moves along the track. In another aspect of the invention, the spring is a coil spring contained within the pusher unit for driving rotation of the axle. Preferably, a rotary damper regulates the operation of the coil spring.
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