Electric vacuum cleaner
First Claim
1. An electric vacuum cleaner comprising:
- a communicating tube forming an air trunk which communicates to a suction opening which suctions dust; and
a vacuum cleaner main body having a suction motor and a communicating tube attachment member which attaches the communicating tube so as to communicate the communicating tube to the suction motor, wherein the vacuum cleaner main body including;
a wheel for running on a floor;
driving means for driving the wheel;
detecting means for detecting with a sensor a pulling tension given to the communicating tube during a cleaning operation with the communicating tube gripped, and outputting a voltage signal depending on the detected pulling tension;
differentiating means for differentiation-processing the voltage signal from the detecting means; and
control means for controlling the driving means depending on a period when a signal level of a differentiation signal differentiated and output by the differentiating means exceeds a predetermined threshold level.
1 Assignment
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Accused Products
Abstract
In an electric vacuum cleaner including a communicating tube forming an air trunk which communicates to a suction opening which suctions dust and a vacuum cleaner main body having a communicating tube attachment member attaching the communicating tube, a strain gauge is attached to a floor surface side of the communicating tube attachment member. This strain gauge is connected to one side of a resistor bridge circuit. Tension acts on the strain gauge due to an operation of the communicating tube during the cleaning so that an output is generated at the resistor bridge circuit. After being amplified, this output is differentiated in a condenser. This differentiated voltage signal is compared to a threshold level voltage in a comparator. A running motor is driven only in a period that the voltage signal exceeds the threshold level voltage.
17 Citations
8 Claims
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1. An electric vacuum cleaner comprising:
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a communicating tube forming an air trunk which communicates to a suction opening which suctions dust; and
a vacuum cleaner main body having a suction motor and a communicating tube attachment member which attaches the communicating tube so as to communicate the communicating tube to the suction motor, wherein the vacuum cleaner main body including;
a wheel for running on a floor;
driving means for driving the wheel;
detecting means for detecting with a sensor a pulling tension given to the communicating tube during a cleaning operation with the communicating tube gripped, and outputting a voltage signal depending on the detected pulling tension;
differentiating means for differentiation-processing the voltage signal from the detecting means; and
control means for controlling the driving means depending on a period when a signal level of a differentiation signal differentiated and output by the differentiating means exceeds a predetermined threshold level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification