Sifting device
US4260481A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 1979 |
| Grant date | Apr 7, 1981 |
| Priority date | — |
| Expiry date | Apr 5, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB07B1/38
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved plansifter having an open trough-shaped housing (12) on which is centrally mounted an oscillation generator having a drive motor (40) and a rotary and balance weight (41) for imparting oscillation movement to the housing (12). A pair of sieve stacks (23), each having a plurality of individual sieves (4), is mounted on the floor (16) of the housing (12) stradling the oscillation generator. The housing (12) is suspended for free oscillation. In a preferred construction, the rotary unbalance weight (41) is accelerated by the drive motor (40) to operational speed in a short period of time in order to preclude adverse resonance effects. The deleterious effects which might occur to the structure as it goes through its resonance frequency during acceleration and deceleration of the rotary unbalance weight (41) can be further minimized by providing a suspension means comprising an elastic suspension element (26) at one of four positions on the housing (12). Each element (26) may include a plurality of circularly cylindrical plastic bars ( 25) extending parallelly from a point or locus of affixation on the housing (12). In one preferred embodiment, first and second ends of the b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.