Piezoelectrically-actuated vibrating surface-finishing tool

Details Piezoelectrically-actuated vibrating surface-finishing tool Piezoelectrically-actuated vibrating surface-finishing tool

1997-10-15

1998-11-17

Nguyen, Khanh P.

Plastic article or earthenware shaping or treating: apparatus

Vibrating means including mechanical movement or power means

152354, 264 69, 401 97, 401114, 425458, B28B 108, E01C 1922

Patent

active

058372989

ABSTRACT:
A vibrating hand trowel for finishing plastic concrete. The vibratory mechanism includes piezoelectric elements which vibrate at a high frequency when a voltage is applied to them. The trowel as a whole includes a top piece including a cover plate and handle, and a bottom piece including the piezoelectric elements mounted on a rib and a flat bottom which contacts the concrete. The top and bottom piece are preferably attached by a series of screws. The vibrating trowel is pulled over the concrete creating a smooth, wet layer useful for lubrication of the area where the trowel and concrete are in contact. This layer develops because the vibrations cause water and air to rise to the top of the concrete. The invention will allow for easy finishing of plastic concrete because of its lightweight and simple design. The invention will also create a smooth finish of the hardened concrete.

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