Sieving device with duel independent frequency input

Details Sieving device with duel independent frequency input Sieving device with duel independent frequency input

1997-05-07

1999-12-21

Valenza, Joseph E.

Classifying, separating, and assorting solids

Sifting

Plane sifters

209326, 2093665, 209367, B07B 138, B07B 134, B07B 144

Patent

active

060036796

ABSTRACT:
A sieving device includes a sieve having a base, a drum and a main rim. A screen assembly having a mesh screen and a screen frame extending around a periphery of the mesh screen is resiliently mounted within the main rim. A low frequency vibrational drive vibrates the sieve at low frequencies. An ultrasonic vibrational probe rests on the screen frame free of rigid attachment thereto and vibrates the mesh screen around a periphery thereof. The ultrasonic vibrational drive includes an ultrasonic processor which drives the ultrasonic probe. A probe tip of the probe extends through a side wall of the main rim and rests on a top surface of the screen frame vibrating the screen from the periphery of the screen inwardly to sieve a particulate material. An alternative embodiment has a tab which extends outwardly from the screen frame. The probe tip extends through the sidewall of the main rim and through a sidewall of the drum to abut the tab.

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