| 摘要 |
A knock-down vibrating concrete screed comprises elongate screed units attachable end-to-end in a longitudinally extending row to provide a screed of desired length. Ones of the screed units each comprise an elongate frame unit movable transversely over the concrete and vibration apparatus for vibrating the corresponding frame unit for smoothing the concrete over which the frame unit moves. The adjacent ends of the screed units positively block coaxially longitudinal movement of adjacent screed units into attached relation with each other. The adjacent ends of the screed units also block strictly coaxial longitudinal movement of attached screed units out of attached relation with each other. Further, the adjacent ends of adjacent screed units are attachable to each other by longitudinal overlapping, followed by movement one toward the other in one direction transverse to the length of the screed into an attached position of longitudinal alignment in which the longitudinally overlapped ends positively block further movement in such one direction. Quick change devices require no tools to connect and disconnect adjacent screed unit ends. A motor is mounted on one of the screed units, and can be placed at any desired location along the length of the screed, for driving the vibration apparatus to vibrate the screed. A winch support member is releasably lockable at alternate locations on and along the screed units by a quick change device not requiring tools, for forwardly propelling the screed across concrete to be smoothed.
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