Electric vacuum cleaner

Inactive Publication Date: 2007-03-22
TOSHIBA TEC KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] It is an object of the present invention to provide an electric vacuum cleaner which can smoothly self-propel a vacuum cleaner main body with a good follow-up performance in response to a user's operation of pulling a communicating tube such as a hose.

Problems solved by technology

Consequently, the vacuum cleaner main body always moves by a predetermined distance, and there is a problem that follow-up performance is poor since it is not possible to move the vacuum cleaner main body by only a short distance, which is less than the predetermined distance.
However, to drive the electric motor simply for the period of the switch-on causes a problem that operation of the electric motor becomes unstable so as not to smoothly self-propel the vacuum cleaner main body in response to the pull of the hose.

Method used

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Experimental program
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first embodiment

[0028]FIG. 1 is a perspective view showing an overall configuration of an electric vacuum cleaner. The electric vacuum cleaner includes a communicating tube 1 which is formed cylindrically and a vacuum cleaner main body 3. The vacuum cleaner main body 3 has a communicating tube attachment member 2, which is formed cylindrically so as to attach the communicating tube 1.

[0029] The communicating tube 1 includes the first extension pipe 5, the second extension pipe 7, and a hose 8 attaching an operation member 6 at its one end. At one end of the first extension pipe 5, there is provided a suction opening 4, which slides on a floor so as to suction dust. Further, at the other end of the first extension pipe 5, the first extension pipe 5 slidably fits the other end of the second extension pipe 7. The suction opening 4 is detachable from the first extension pipe 5.

[0030] The hose 8 extends from the operation member 6 and is attached to the communicating tube attachment member 2 of the va...

second embodiment

[0073] This embodiment will describe a modification example of attaching the strain gauge 22 to the communicating tube attachment member 2. In addition, the same components as in the above-described embodiment are given the same reference numbers.

[0074] As shown in FIG. 7, the communicating tube attachment member 2 equips cylindrical projections 51 and 52 at two positions, its front and rear on the front surface side. The front projection 51 is made short in its projecting length. The rear projection 52 is made long in its projecting length. And a detecting member 53 to which the strain gauge 22 has been attached is prepared.

[0075] The central portion of the detecting member 53 is formed to be thin and attaches the strain gauge 22 in its center, as shown in FIG. 8. Further, the detecting member 53 equips holes 54 and 55 for fitting the projections 51 and 52 at its front and rear.

[0076] The thickness of the detecting member 53 from the central portion to which the strain gauge 22 ...

third embodiment

[0082] This embodiment will describe a modification example of the communicating tube attachment member to attach the communicating tube 1. In addition, the same components as in the above-described embodiments are given the same reference numbers.

[0083] As shown in FIG. 9, the front end 8a of the hose 8 making up the communicating tube 1 fits a communicating tube attachment member 61 of the vacuum cleaner main body 3. As shown in FIGS. 10 and 11, a rear end 61a of the communicating tube attachment member 61 is cylindrically formed sideways and the communicating tube attachment member 61 is supported pivotally at the vacuum cleaner main body 3. And a front portion which the front end 8a of the hose 8 is fitted to turns upward and downward on the rear end 61a.

[0084] An air trunk communicating between the rear end 61a of the communicating tube attachment member 61 and the dust chamber 10 is so formed that the airflow from the hose 8 enters the dust chamber 10 straight. Instead, the ...

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PUM

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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.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This is a Continuation Application of PCT Application No. PCT / JP2006 / 305531, filed Mar. 20, 2006, which was published under PCT Article 21(2) in Japanese. [0002] This application is based upon and claims the benefit of priority from prior Japanese Patent Applications No. 2005-088436, filed Mar. 25, 2005; and No. 2005-088437, filed Mar. 25, 2005, the entire contents of both of which are incorporated herein by reference.BACKGROUND OF THE INVENTION [0003] 1. Field of the Invention [0004] The present invention relates to an electric vacuum cleaner having a communicating tube which communicates dust suctioned from a suction opening to a vacuum cleaner main body. [0005] 2. Description of the Related Art [0006] For example, Jpn. Pat. Appln. Publication No. 2-7929 discloses an electric vacuum cleaner, which has a hose forming an air trunk and mounts the hose on a vacuum cleaner main body. [0007] This electric vacuum cleaner has a mechanical swi...

Claims

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Application Information

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IPC IPC(8): A47L5/00
CPCA47L5/362A47L9/009A47L9/248A47L9/2889A47L9/2842A47L9/2857A47L9/2884A47L9/2805
Inventor SANO, MASAHITOTSUCHIYA, OSAMU
Owner TOSHIBA TEC KK
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