Blower

Details Blower Blower

2005-02-03

2009-06-02

Kramer, Devon C (Department: 3746)

Pumps

With muffler acting on pump fluid

C417S371000, C417S423100, C417S423140, C415S119000

Reexamination Certificate

active

07540722

ABSTRACT:
A blower providing a blower mode and a vacuum mode. A casing provides a motor housing installing a motor and a fan housing installing a centrifugal fan rotationally driven by the motor. A partition is disposed and having a first surface defining a motor housing and second surface defining a fan housing. The fan includes a generally circular base plate having one surface in direct confrontation with the second surface. A plurality of base plate through-holes arrayed in an imaginary circle whose center is coincident with the rotation axis of the fan are formed in the base plate. The partition is formed with a plurality of partition through-holes arrayed in the imaginary circle and in selective alignment with the base plate through-holes in accordance with the rotation of the centrifugal fan. Each partition through-hole includes a width increasing region where a width of the partition through-hole in the circumferential direction is gradually increased toward the second surface.

REFERENCES:
patent: 6283726 (2001-09-01), Fackelmann et al.
patent: 6305909 (2001-10-01), Jankowski et al.
patent: 6511286 (2003-01-01), Miyamoto
patent: 2002/0067995 (2002-06-01), Cifarelli
patent: 2002-339898 (2002-11-01), None

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