Plastic article or earthenware shaping or treating: apparatus – Vibrating means including mechanical movement or power means
Patent
1981-10-06
1983-10-11
Anderson, Philip E.
Plastic article or earthenware shaping or treating: apparatus
Vibrating means including mechanical movement or power means
264 69, 404114, 404119, 404120, B28B 108, B28B 1700, E01C 1938
Patent
active
044089783
ABSTRACT:
An apparatus for automatically advancing a concrete screed as the screed tamps and levels concrete. The apparatus includes cable reeling means attached to either end of the concrete screed for winding a drive cable. The drive cable is adapted for attachment to a fixed location downstream from the screed so that winding of the cable on the reeling means propels the concrete screed towards the fixed location. The cable reeling means is driven by a power transfer means including a driven pulley and a slave pulley with an endless belt loosely mounted around the pulleys so that when the driven pulley is rotated, the belt will normally not drive the slave pulley. The apparatus also includes an assembly positioned to tension the belt between the drive and slave pulleys to cause the driven pulley to drive the slave pulley through the belt, and therefore drive the cable reeling means, propelling the concrete screed across the concrete. The tensioning of the belt is adjustable so that, if desired, the belt is allowed to slip. By appropriate adjustment of the tension, the speed of propulsion of the concrete screed is controlled.
REFERENCES:
patent: 4213749 (1980-07-01), Morrison
patent: 4261694 (1981-04-01), Morrison
patent: 4316715 (1982-02-01), Allen
patent: 4335976 (1982-06-01), Morrison
patent: 4340351 (1982-07-01), Owens
patent: 4349328 (1982-09-01), Allen
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