Vacuum cleaner having silencer mechanism

Details Vacuum cleaner having silencer mechanism Vacuum cleaner having silencer mechanism

1992-01-10

1992-11-03

Hornsby, Harvey C.

Brushing, scrubbing, and general cleaning

Machines

With air blast or suction

55276, 55372, 55DIG3, 181231, B01D 4600, A47L 900

Patent

active

051597381

ABSTRACT:
A blower cover is provided so as to surround an electric driven blower. The blower cover comprises an upper blower cover and a lower blower cover. An exhaust air duct as a silencer mechanism is provided on the upper blower cover and is disposed between a blower receiving chamber and a cord receiving chamber. The exhaust air duct comprising an outer peripheral wall portion and a side wall portion. The outer peripheral wall portion has a partitioning rib and a curved guiding rib. The exhaust air duct forms a U-shaped exhaust air flow passage. An expansion chamber is disposed air flow passage. An expansion chamber is disposed at a down stream of the exhaust air duct. The exhaust air from an intake port of the exhaust air duct flows the U-shaped flow passage and is led to the expansion chamber. The suctioned air is expanded in the blower receiving chamber. The exhaust air is compressed in the exhaust air duct and is expanded again in the expansion chamber.

REFERENCES:
patent: 3964888 (1976-06-01), Hahner et al.
patent: 4050913 (1977-09-01), Roach
patent: 4356591 (1982-11-01), Lude
patent: 4533370 (1985-08-01), Ikezaki et al.
patent: 4617034 (1986-10-01), Ikezaki et al.
patent: 4733429 (1988-03-01), Jacob et al.
patent: 4970753 (1990-11-01), Herron, Jr.

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