Variable speed, variable motion, electrically operated vibrator for screening machinery
Patent 4728837 Issued on March 1, 1988. Estimated Expiration Date: 
March 1, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 1, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2378668 2378669 2561890 2703370 2761079 2945386 InventorAssigneeApplicationNo. 06/677109 filed on 11/30/1984US Classes:310/80, Motion conversion310/81, Unbalanced weight (e.g., vibrators)310/82Swash plateExaminersPrimary: Duggan, Donovan F.Attorney, Agent or FirmInternational ClassesH02K 41/06 (20060101)B07B 1/42 (20060101) H02K 7/06 (20060101) H02K 41/00 (20060101) H02K 41/02 (20060101) AbstractA vibration generator (50) is disclosed for generating vibration energy. A magnetically attractable mass (98) is loosely disposed within a substantially cylindrical cavity of a housing (54). An array of electromagnets (60-90) are circumferentially spaced around the housing cavity. The electromagnets (60-90) are sequentially energized in a predetermined sequence to magnetically attract the loosely disposed mass (98) toward an energized electromagnet thereby causing the magnetically attractable mass (98) to orbit around the array of electromagnets imparting centrifugal force to housing (54) which in turn generates vibration energy. | |
