Prefilter for an air filter of an internal combustion engine
AssigneeAndreas Stihl
InventorDietmar Grabowski
Life of this patent
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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.
Claims19
A prefilter for an air main filter of an internal combustion engine, the main filter being configured as a filter ring having an outer surface and defining a flow direction substantially radially inward through the outer surface, the prefilter being provided for covering the outer surface of the main filter and comprising:
- a flexible frame and a screen mounted in said frame;
- said frame and screen conjointly defining a band-like structure;
- said band-like structure defining a longitudinal axis and said frame having two longitudinal end portions;
- and,
- a closure device having first and second parts on corresponding ones of said end portions for coacting to releasably hold said prefilter on the main filter.
Dependencies are inferred from the claim text.