Frederick T Kidder

US Patent:

60036796, Dec 21, 1999

Filed:

May 7, 1997

Appl. No.:

8/852593

Inventors:

Victor William Maroscher - Leetonia OH
Dennis Keith Ulrich - Salem OH
Frederick T. Kidder - Lisbon OH

International Classification:

B07B 138
B07B 134
B07B 144

US Classification:

209332

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.