Vacuum cleaning head

Details Vacuum cleaning head Vacuum cleaning head

Filed on

2003-09-10

Date issued

2008-10-28

Examiner

Wilson, Lee D (Department: 3723)

Patent Class

Brushing, scrubbing, and general cleaning

SubClass

Machines

SubSubClass

With air blast or suction

Other Related Categories

C015S416000, C015S331000

Type

Reexamination Certificate

Status

active

Patent number

07441307

Description

ABSTRACT:
A restricting device is positioned in the flow duct leading from the main inlet to the cleaning head of a vacuum cleaner and is movable between a restrictive position, in which it serves to restrict the cross-section of the discharge outlet, and an open position, in which it restricts the cross-section of the discharge outlet to a lesser extent. The restricting device is movable by the passage of debris along the flow duct.

REFERENCES:
patent: 2904816 (1959-09-01), Skolfield
patent: 2904817 (1959-09-01), Brennan
patent: 5008973 (1991-04-01), Worwag
patent: 5293665 (1994-03-01), Worwag
patent: 5416948 (1995-05-01), Worwag
patent: 5802666 (1998-09-01), Jung
patent: 5950275 (1999-09-01), Wörwag
patent: 6099661 (2000-08-01), Conrad
patent: 6615445 (2003-09-01), Worwag
patent: 2005/0251953 (2005-11-01), Hackwell et al.
patent: 2006/0162119 (2006-07-01), Smith
patent: 42 29 030 (1994-03-01), None
patent: 10-328092 (1998-12-01), None
patent: 11-9523 (1999-01-01), None

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