Matsushita Electric Industrial Co., Ltd.

Sadahiro Shimada

Hidenori Kitamura

Hiroshi Kawakami

Yuichi Shimizu

Akihiro Hirano

Mitsuo Ishii

Masakazu Onda

Shuji Asada

Kazuma Suoh

An electric vacuum cleaner includes a main body. A hose is connected to the main body. A motor-drive brush is provided in a floor nozzle. An extension pipe connects the floor nozzle and one end of the hose. An electric conductor is located in the extension pipe. The extension pipe includes an outer tube, an inner tube, a first electric connection terminal, a second electric connection terminal, a first conductor casing, and a second conductor casing. The first electric connection terminal is pfovided on one end of the outer tube. The second electric connection terminal is provided on one end of the inner tube. The inner tube slidably extends into the outer tube. The electric conductor is connected between the first electric connection terminal and the second electric connection terminal. The electric conductor is accommodated in the first conductor casing and the second conductor casing. The first conductor casing is provided on the outer tube. The second conductor casing is provided on the inner tube. The outer tube has a dust suction passage. The inner tube has a dust suction passage. The first conductor casing has an interior isolated from the dust suction passage in the outer tube. The second conductor casing has an interior isolated from the dust suction passage in the inner tube.

Electric vacuum cleaner

A dust detector in a vacuum cleaner includes a light-emitting element exposed into a dust suction passage for emitting a light beam into the dust passage, and a light-detecting element exposed into the dust suction passage for detecting the light beam emitted from the light-emitting element. A detector unit detects the amount of dust flowing through the dust suction passage based on the intensity of the light beam transmitted from the light-emitting element across the dust suction passage to the light-detecting element. The light-emitting element and the light-detecting element are covered respectively by a pair of light-transmissive covers having respective end faces exposed into the dust suction passage and lying flush with an inner wall surface of the dust suction passage.

Dust detector for vacuum cleaner

Growing community of inventors

Youkaichi, Japan

Sadahiro Shimada