JPS6310136Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vacuum cleaner having a suction port equipped with a rotating brush driven by a rubber belt or the like.
The purpose is to prevent static electricity generated by the friction of various parts when the rotating brush rotates from causing electrical shock to the human body.

Conventionally, in a vacuum cleaner having a suction port equipped with a rotating brush driven by a rubber belt or the like, the rotation of the electric motor is transmitted to the rotating brush by the rubber belt, but as shown in FIG. The belt 102 is engaged and the rotating brush rotates in the direction of the arrow.
As a result of the investigation, it was found that when the pulley 101 and belt 102 repeatedly come into contact at point a and separate at point b, a phenomenon similar to friction occurs and static electricity is generated. It was also found that the static electricity generated between the felt packing and the rotating brush accounts for a much larger proportion than the static electricity generated between the felt packing and the rotating brush. The generated static electricity flows from the rotating brush shaft of the rotating brush to the bearing, and sends sparks to the steel plate case back, giving a very uneasy feeling. Static electricity builds up, and there is a risk of electric shock if a person touches it, and there is also a risk of secondary damage due to the shock of electric shock when touched.

This invention attempts to prevent the above dangers.
Hereinafter, one embodiment will be described with reference to the accompanying drawings. In the figure, 1 is the top of the vacuum cleaner body made of synthetic resin (hereinafter referred to as the top of the main body), 2 is the bottom of the vacuum cleaner body also made of synthetic resin (hereinafter referred to as the bottom of the main body), and 3 is the top of the vacuum cleaner body 1 made of synthetic resin. This is a dust container detachably disposed on the upper part of the dust container 3, and is locked to the upper body 1 by a hook 4 and a buckle 5 provided on the upper part of the dust container 3. Reference numeral 6 denotes a filter device detachably disposed at the opening of the dust container 3. Reference numeral 7 denotes a blower electric motor built into the upper body 1 and the lower body 2, which has a drive shaft 8 at the rear and is supported by support rubber front 9 and rear support rubber 10. 11 is a shaft portion A12 integrally formed on the upper body 1 and the lower body 2;
This suction port is made of synthetic resin and is rotatably locked by metal fittings A14 and B15 fitted to the shaft portion B13, and bumpers 16 for preventing damage to furniture are attached to the front and side surfaces. Reference numeral 17 denotes a rotating brush disposed in front of the suction port 11. A rotating brush shaft 18 made of metal and protruding from both ends is pivotally supported by a bearing 19 in which a sleeve made of oil-impregnated brass is supported by a metal fitting.

Reference numeral 20 denotes a vibration absorbing bearing rubber fitted to the outer periphery of the bearing 19, and is made of conductive rubber. Reference numeral 21 denotes a pulley that is fitted onto the end of the rotating brush 17 to prevent it from rotating, and transmits the rotation of the electric motor 7 to the rotating brush 17 via a belt 22 made of rubber such as silicone rubber that is stretched between the pulley and the drive shaft 8 . 23 is a protective lid for protecting the belt 22, which has a protrusion 25 fitted into a mounting hole 24 formed integrally with the metal fitting A14, and is made of a galvanized steel plate. Reference numeral 26 denotes a back cover attached to the lower surface of the suction port 11, which is made of a steel plate and is pressed into contact with the bearing rubber 20 and the handle portion 27 of the protective cover 23, so that the rotary brush shaft 18 and the metal fitting A14 are electrically connected. 28 is 1 on the main body
A contact spring is held by being held between the support rubber back 10 and is made of a rectangular phosphor bronze plate, etc., and one end is approximately U-shaped, and is pressed into contact with the metal fitting A14 through a hole 29 provided in the shaft portion A12. Even if the mouth 11 rotates during use, the contact spring 28 and the metal fitting A14 are always electrically connected, and the other end is
The lead wire at one end of a resistor 30 of 1MΩ to 500MΩ is spot welded. The lead wire at the other end of the resistor 30 is fixed to the outer shell 7' of the motor 7 with screws 35 together with a capacitor 31 for noise prevention.
8. It is electrically connected to the outer shell 7' of the motor 7 via a resistor 29. 32 is a hose that communicates the suction port 11 and the dust container 3, 33 is a wheel, and 34 is a handle fixed to the main body 1.

In the above structure, when the vacuum cleaner is operated, the rotary brush 17 starts rotating, and the scraped up dust is collected in the dust container 3 through the suction port 11 and the hose 32.

As described above, static electricity is generated between the belt 22 and the pulley 21, and in the conventional case, sparks are generated between the bearing 19 and the back cover 26, and the back cover 26
High-voltage static electricity accumulates in the 5th part, and since it is made of steel plate, if you touch it, you get an electric shock.
~8 As shown in FIG.
8. Electrical continuity is established through the resistor 30, and the static electricity accumulated on the back cover 26 is corona discharged between the windings of the motor 7 and escapes to the power supply.
Static electricity does not accumulate on the back cover 26, and you will not get an electric shock even if you touch it. At the same time, the back cover 26 and the bearing 19
Even during this period, the electrical conduction is maintained by the conductive bearing rubber 20, so that the spark does not get tired.

In addition, in this embodiment, the resistance value between the outer shell 7' of the electric motor 7 and the metal fitting A14 is 1 MΩ to 500 MΩ.
Since the resistors 30 are arranged in the upper part 1 and the lower part 2 of the main body made of synthetic resin, even if the motor 7 causes dielectric breakdown and the power supply voltage is directly applied to the outer shell 7' of the motor 7, it will not be touched by a person. The upper body 1, lower body 2, etc., which are at risk, are insulators made of synthetic resin, so there is no risk of electric shock, and the metal back cover 26, protective cover 23,
There is no risk of electric shock as the power supply voltage is applied directly to the metal fitting A14, and at the same time, the leakage current flowing from the back cover 26 etc. to the ground is less than 1 mmA, which satisfies technical standards and there is no danger of electric shock.

In addition, as shown in FIG. 9, a capacitor 31 for noise prevention is provided, but if the back cover 26 and the outer shell of the electric blower 7 are electrically connected, a small amount of electricity charged in the capacitor 31 will be generated. is back cover 26
may cause electric shock to sensitive people. However, as described above, since the outer shell of the motor 7 and the back cover 26 are connected through the resistor 29, there is no risk of electric shock.

As described above, this invention electrically connects the steel plate back cover and protective cover provided on the underside of the suction port with the outer shell of the motor, allowing static electricity to escape to the power supply side and prevent static electricity from accumulating on the back cover, etc. At the same time, if a resistor is installed, there will be no problem even if the motor causes dielectric breakdown and the power supply voltage is applied to its outer shell.Moreover, if the resistor is housed inside the main body, there will be no problem. The power supply voltage is not directly applied to the back cover, etc., which may be touched by people, and the leakage current is less than 1 mmA, which satisfies technical standards and poses no risk of electric shock.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view showing an embodiment of the vacuum cleaner of the present invention, Fig. 2 is an overall perspective view of the same rotating brush section, Fig. 3 is a central sectional view of the vacuum cleaner, and Fig. 4 is a vacuum cleaner of the same invention. Figure 5 is a rear view of the suction opening with the back cover and protective cover removed, Figure 6 is an enlarged cross-sectional view of the main parts, Figure 7 is a cross-sectional view of the suction opening, 8th
9 is a circuit diagram of the same, and FIG. 10 is a side view of a pulley portion showing a conventional example. 7... Electric motor, 7'... Outer shell, 11... Suction port,
17... Rotating brush, 23... Protective lid, 26...
Back cover.

Claims (1)

[Scope of utility model registration request] A metal back cover is provided on the underside of the suction port that houses a rotating brush that transmits the rotation of the electric motor via the belt, and a metal protective cover that covers the back cover and the lower part of the belt, and a metal protective cover that covers the outside of the electric motor. A vacuum cleaner that is electrically connected to the shell through a resistor.