Plastic article or earthenware shaping or treating: apparatus – Vibrating means including mechanical movement or power means
Patent
1978-03-06
1980-07-22
Parrish, John A.
Plastic article or earthenware shaping or treating: apparatus
Vibrating means including mechanical movement or power means
404119, 404120, B28B 108
Patent
active
042137497
ABSTRACT:
A lightweight and portable vibrating screed is made up of a base frame unit which mounts a variable speed drive engine and to which other pivotal sub-frame units may be attached for extending the length of the screed. A shaft is supported with a substantial amount of play between the shaft and its support bearings for rotation between a trailing pair of screed blades to which vibration is imparted throughout the length of the screed as the shaft is driven by the engine. The engine vibration is also imparted in a manner to cause the screed to creep forward which reduces the force required to advance the screed over the concrete. A third leading blade to which relatively minimal vibration is imparted acts to level the concrete, substantially reduces manual puddling and improves the screeding accomplished by the trailing pair of blades.
REFERENCES:
patent: 2299700 (1942-10-01), Millikin
patent: 3412658 (1968-11-01), Griffin
patent: 3817644 (1974-06-01), Matson
patent: 4030873 (1977-06-01), Morrison
Olive B. B.
Parrish John A.
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