Vibratory screening apparatus

A vibratory screening apparatus which comprises a frame having a pair of opposed screen frame sides, at least one screen mounted on the pair of opposed screen frame sides, and a shaft-driven vibratory mechanism coupled with at least one screen in order to impact vibration energy thereto so as to assist the screening operation, said mechanism comprising:

• a) a first stubshaft and a second stubshaft, the first stubshaft extending outwardly from one of the pair of opposed screen frame sides, and the second stubshaft extending outwardly from the opposing frame side of the pair of opposed screen frame sides;
• b) a first pair of bearing housings supporting the first stubshaft, the first pair of bearing housings mounted on the frame side from which the first stubshaft extends outwardly, and the first pair of bearing housings being spaced apart from each other;
• c) a second pair of bearing housings supporting the second stubshaft, the second pair of bearing housings mounted on the frame side from which the second stubshaft extends outwardly, and the second pair of bearing housings being spaced apart from each other;
• d) a first counterweight mounted on the first stubshaft in the space between the first pair of bearing housings, said first counterweight being rotatable with the first stubshaft in order to apply vibration energy to the first stubshaft and therefrom to at least one screen via the bearing housings and the frame sides;
• e) a second counterweight mounted on the first stubshaft in the space between the second pair of bearing housings, said second counterweight being rotatable with the second stubshaft in order to apply vibration energy to the second stubshaft and therefrom to at least one screen vis the bearing housings and the frames sides;
• and
• f) drive means coupled with each stubshaft for applying rotary motion thereto, the drive means comprising a drive motor coupled with the outward free end of each stubshaft arranged to drive the first and second stubshafts in synchronism with each other, so that the same pattern of vibrations are applied to at least one screen at each side thereof.

A vibratory screening apparatus which comprises a frame having a pair of opposed screen frame sides, at least one screen mounted on said frame sides, and a shaft-driven vibratory mechanism coupled with the screen in order to impart vibration energy thereto so as to assist the screening operation, said mechanism comprising:

• a) a first stubshaft and a second stubshaft, the first stubshaft extending outwardly from one of the pair of opposed screen frame sides, and the second stubshaft extending outwardly from the opposing frame side of the pair of opposed screen;
• b) bearing housings mounted on each frame side supporting each stubshaft;
• c) a respective counterweight mounted on each stubshaft and being rotatable therewith in order to apply vibration energy to the stubshaft and therefrom to the screen via the bearing houses;
• and
• d) a drive motor coupled with each stubshaft and arranged to apply synchronous rotary motion to each stubshaft.