Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1988-12-01
1990-07-24
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15339, 15412, A47L 928
Patent
active
049426400
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a home electric vacuum cleaner which is capable of controlling input power for a motor blower contained in the body of the electric vacuum cleaner by a switch provided in the handle portion of a hose.
BACKGROUND OF THE INVENTION
For example, in U.S. Pat. No. 460,082, there is disclosed an electric vacuum cleaner which is capable of controlling rotational speed of an electric motor for a suction fan in accordance with an indication of a detected amount of dust under suction wherein an indication of the amount of dust is provided to an operator. However, in the above nmentioned prior art in such a controlling mode, i.e., in an automatic operation mode, it is impossible to temporarily control suction force manually, without regard to the detection signal. Therefore, there is an inconvenience to a user in actual use of the prior art device.
Additionally, in Japanese patent application provisional publication No. 59-14594, an electric vacuum cleaner is disclosed which is capable of controlling suction force by a handle switch provided to a handle of the electric vacuum cleaner having a motor for a suction fan and an AC motor of floor-suction-inlet electric drive. However, the disclosed electric vacuum cleaner has a drawback in that when the handle switch is operated, input power for the motor blower changes gradually, thus, decreasing rotational frequency of the AC motor of the floor-suction-inlet electric drive. Therefore, this fact means that such handle switch operation does not provide an easily sensed response to operation of the handle switch, but gives the operator only a strange feeling.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide an electric vacuum cleaner having an automatic operation function and being capable of changing a suction force of a motor blower in accordance with a detection signal which is obtained by detecting the amount of dust passing through the hose, but which is also capable of temporarily changing the suction force as desired by an operator, even if the electric vacuum cleaner is set in an automatic operation mode.
In order to achieve this object, according to the present invention there is provided an electric vacuum cleaner which is capable of an automatic control operation for changing suction force automatically in accordance with the amount of dust passing through the air suction path, wherein a switch is provided which is capable of temporarily changing the suction force manually, irrespective of the amount of dust detected in the above-mentioned automatic controlling operation.
In an electric vacuum cleaner according to the above mentioned structure, when the operator operates the above-mentioned switch, the operator can change suction force temporarily as desired. This means that if the operator uses the the electric vacuum cleaner where this electric vacuum cleaner would operate with a low suction force in automatic operation mode, and if the operator desires to operate the electric vacuum cleaner at a high suction force locally, the operator can operate the electric vacuum cleaner with a high suction force with a switch operation. When the operator terminates the switch operation, the electric vacuum cleaner returns to the original automatic operation after passage of a predetermined time period. Contrarily, if the operator believes that the suction force is too high, the operator can similarly change the suction force to a low suction force rapidly with easy operation. In addition, the electric cleaner can be returned to the original state after a predetermined time period passed.
Moreover, according to the present invention, there is provided an electric vacuum cleaner having indication elements for indicating the degree of suction force in the automatic control mode and means for causing the above mentioned indication elements to indicate changes in levels of suction force which result from operating the switch. According to this structure, switch operation and automatic op
REFERENCES:
patent: 4601082 (1986-07-01), Kurz
patent: 4654924 (1987-04-01), Getz et al.
patent: 4680827 (1987-07-01), Hummel
Hayashi Nobuhiro
Imai Hidetoshi
Tanaka Toshiichiro
Yamaguchi Seiji
Matsushita Electric - Industrial Co., Ltd.
Moore Chris K.
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