| 摘要 |
A reciprocable member provided with a continuous gear track is driven over a rectilinear path of travel by a single reciprocable drive gear which is in mesh with the gear track or a pair of drive gears on opposite sides of the track. The driven member is restrained by guide means for movement along a rectilinear path, and the drive gear is rotatable to effect the reciprocation of the driven member. A load-supporting frame is positioned adjacent the reciprocable driven member and supports a pair of rotatable sheaves over which a flexible element is trained with one end of the flexible element being joined to the driven member. A load can thus be attached to the other end of the flexible element with its weight being carried by the aforementioned support frame.
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