Prefilter for an air filter of an internal combustion engine
US5102436A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1991 |
| Grant date | Apr 7, 1992 |
| Priority date | — |
| Expiry date | Oct 2, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/31
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A prefilter for an air main filter of an internal combustion engine such as a two-stroke engine is configured as a filter ring with the engine being especially a two-stroke engine in a handheld work tool. The filter ring defines a flow directed essentially radially inward and the prefilter has a band-like configuration and is mounted for covering the outer surface of the main filter. The prefilter includes a screen held in a flexible frame and so permits a rapid exchange thereof and is easy to clean and does not restrict the air throughput. The frame carries a part of the closure device at each end thereof lying in the longitudinal direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.