Variable spring rate pulverizer apparatus
US5492279A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 1994 |
| Grant date | Feb 20, 1996 |
| Priority date | — |
| Expiry date | Sep 28, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB02C15/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A pulverizer for crushing coal for use in a combustion process includes a bowl shaped body, a roller dimensioned and configured for contact with at least a portion of the bowl shaped body, apparatus for causing relative movement between the bowl shaped body and the roller; and apparatus for biasing the roller against the bowl shaped body, the apparatus for biasing including a spring assemblyat includes a first spring and a second spring. The apparatus means for biasing including apparatus allowing initial compression of the first spring before the second spring is compressed. In some forms of the invention the first spring and the second spring are coil springs and the first and second springs are compressed simultaneously after initial compression of the first spring. In other forms of the invention the first and second springs are disposed in coaxial relationship with the second spring overlapping an axial part of the first spring. In this form of the invention the second spring has a free axial length that is less than the free axial length of the first spring. The apparatus allowing initial compression may include a washer disposed at one axial extremity of the first spring and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.