Dual filter vacuum cleaner apparatus
First Claim
1. A hand held vacuum cleaner for filtering particles of dust and debris from an airflow passing through the vacuum cleaner, comprising;
- a coarse pre-filter;
a fine primary filter which is located downstream of the pre-filter in the direction of flow of the airflow; and
wherein the pre-filter has a recess for receipt of the primary filter.
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Accused Products
Abstract
A dual filter arrangement for a vacuum cleaner for filtering particles of dust and debris from an airflow passing through the vacuum cleaner. The dual filter comprises a coarse pre-filter having an array of pores formed therein of substantially uniform diameter and a fine primary filter which is located rearwardly of the pre-filter in the direction of flow of the airflow. The dual filter is releasably latched to a main housing portion of the vacuum cleaner housing. A nose cone is removably secured to the housing and circumscribes the dual filter assembly. The dual filter enables even more efficient filtering of contaminants from dust and dirt entrained air ingested by the vacuum cleaner. Attachment of the dual filter to the main housing portion provides the additional advantage of increasing the capacity of the nose cone and eliminating the need for the user to handle the dual filter assembly when emptying contaminants collected within the nose cone. A unique seal arrangement provides a substantially airtight seal between the dual filter system and the main housing to which it is secured.
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Citations
16 Claims
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1. A hand held vacuum cleaner for filtering particles of dust and debris from an airflow passing through the vacuum cleaner, comprising;
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a coarse pre-filter;
a fine primary filter which is located downstream of the pre-filter in the direction of flow of the airflow; and
wherein the pre-filter has a recess for receipt of the primary filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A hand held vacuum cleaner system comprising:
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a housing;
an electric motor disposed within said housing;
a fan driven by said electric motor for generating a suction airflow of air-entrained dirt and debris;
a dual filter system including;
a pre-filter for filtering coarse particles of dirt and debris from the dirt and debris entrained air;
a primary filter for filtering fine particles of dirt and debris from the entrained air;
said pre-filter forming an open ended box shape and said primary filter being adapted to rest nestably within said pre-filter;
said primary filter further comprising a concertina shaped filtering material; and
said housing and at least one of said pre-filter and primary filter including cooperating latching structure for mechanically interengaging to releasably secure said pre-filter and said primary filter to said housing. - View Dependent Claims (12, 13, 14)
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15. A hand held vacuum cleaner for filtering particles of dust and debris from an airflow passing through the vacuum cleaner, comprising;
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a primary filter;
a pre-filter nestably housed adjacent to the primary filter; and
wherein, the primary filter is located downstream of the pre-filter in the direction of flow of the airflow.
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16. A hand held vacuum cleaner for filtering particles of dust and debris from an airflow passing through the vacuum cleaner, comprising;
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a cup-shaped pre-filter; and
a concertina-shaped primary filter disposed adjacent to the pre-filter.
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Specification