Patent ID: 7572082

Claim:
A vibrating device for surfacing concrete, said vibrating device comprising: a surfacing blade; a vibration-causing assembly in communication with said surfacing blade, said vibration-causing assembly comprising: a counterweight body comprising an upper end and a lower end; a substantially vertically extending shaft assembly comprising an upper end and a lower end, wherein the shaft assembly is disposed within the counterweight body such that the lower end of the shaft assembly is proximal to the lower end of the counterweight body; and a double bearing assembly in communication with said shaft assembly; and an actuator in communication with said vibration-causing assembly, so as to cause said vibration-causing assembly to impart a vibratory motion to said blade; wherein said double bearing assembly comprises a first bearing disposed between the shaft assembly and the upper end of the counterweight body and a second bearing disposed between the shaft assembly and the lower end of the counterweight body; and wherein said double bearing-assembly provides for substantially avoiding undesired oscillating movement of said blade during said vibratory motion to achieve smooth surfacing of the concrete.