| 摘要 |
A portable film wrapping system comprises a push-cart having a vertical mast member and a film roll carriage movably mounted upon the vertical mast member. A lift cable connects the film roll carriage to a lift cable drum which is rotatably connected to a lift sprocket through a clutch mechanism, wherein the lift sprocket is rotatably connected to a drive wheel engaged with a floor surface over which the portable system is movable. When the clutch mechanism operatively connects the lift cable drum to the lift sprocket, the lift cable drum is rotated so as to wind the lift cable thereon and thereby continuously elevate the film roll carriage whereby spiral wrapping is achieved. When the clutch mechanism disconnects the lift cable drum from the lift sprocket, the lift cable is no longer wound upon the lift cable drum whereby the film roll carriage is maintained at a particular elevation so as to achieve concentric reinforcing wrapping.
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