Apparatus for agitating and polishing materials

Claim 1

A VIBRATORY POLISHING MACHINE FOR MINERALS, GEM STONES AND THE LIKE COMPRISING A BASE HOUSING, A DRIVE MOTOR POSITIONED WITHIN SAID HOUSING, TWO SPACED PAIRS OF SOUND INSULATED SUPPORT SPRINGS MOUNTED IN RECTANGULAR ARRANGEMENT WITHIN SAID HOUSING, A HORIZONTAL PLATFORM POSITIONED ABOVE SAID HOUSING AND RESILIENTLY SUPPORTED BY SAID SPRINGS, A ROTABLE SHAFT CARRIED IN BEARINGS ON THE UNDERSIDE OF SAID PLATFORM, SAID SHAFT BEING POSITIONED HORIZONTALLY TO ONE SIDE OF THE CENTERLINE BETWEEN SAIS TWO PAIRS OF SUPPORT SPRINGS, A PAIR OF ECCENTRIC WEIGHTS ON EACH END OF SAID SHAFT, THE TWO WEIGHT OF EACH PAIR BEING ROTATABLE WITH RESPECT TO EACH OTHER FOR VARYING THE DEGREE OF UNBALANCE OF SAID SHAFT FROM A POSITION OF SHAFT ROTARY BALANCE TO A POSITION OF MAXIMUM OFF-CENTER WEIGHTING AND MAXIMUM UNBALANCE OF SAID SHAFT, PAIR OF ELASTIC DRIVE BELTS INTERCONNECTING SAID DRIVE MOTOR AND SAID SHAFT FOR ROTATING SAID SHAFT AND EXERTING DOWNWARD PRESSURE ON SAID PLATFORM FOR MAINTAINING SAID PLATFORM IN POSITION ON SAID SUPPORT SPRINGS, AND AN OPEN TOP CONTAINER OF SUBSTANTIALLY CYLINDRICAL CROSS-SECTION FOR RECEIVING A LOAD OF ROUGH MATERIAL POSITIONED ON THE UPPER SURFACE OF SAID PLATFORM, SAID CONTAINER HAVING AN INNER LINING OF ABRASION RESISTANT MATERIAL INTEGRALLY BONDED THERETO.