Apparatus for size-grading objects
US4149637A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 5, 1978 |
| Grant date | Apr 17, 1979 |
| Priority date | — |
| Expiry date | Jan 5, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB07B13/075
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Apparatus for size-grading elongated objects of differing diameters, such as green beans or the like, comprises concentrically arranged inner and outer hollow rotatable slotted drums, with the outer drum having a greater number of axially extending circumferentially spaced apart slots therein than the inner drum; drive mechanisms for rotating both drums in the same direction but at different relative speeds, whereby the slots in the inner and outer drums overlap in different relationships and cooperate so as to define entry slots of different widths at different peripheral positions around the outer drum; an object feeding chute outside the outer drum for directing objects to be size-graded to an entry slot of desired width; a conveyor within the inner drum for receiving size-graded objects which have fallen through the selected entry slot, and a collector on the outside of the outer drum for collecting those objects which have not fallen through the selected entry slot. An adjustable mechanism to rotatably shift the inner drum with respect to the outer drum enables relocation of the entry slot of desired width relative to the object feeding chute. The apparatus is further adapted …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.