JPH0376927B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a suction port body for a vacuum cleaner that uses a turbine as a drive unit for a rotating brush.

TECHNICAL BACKGROUND OF THE INVENTION AND PROBLEMS THEREOF Conventionally, in the suction port body of a vacuum cleaner, a turbine rotated by suction air and a rotating brush are connected by a belt and housed in a main body case. In such a device, when the main body case is lifted from the cleaning surface, the load on the cleaning surface of the rotating brush is released, so the turbine and the rotating brush rotate at extremely high speed. This generates high noise. Therefore, some devices have a leak air path formed on the bottom surface of the main body case that does not apply rotational force to the turbine. When the main body case is lifted from the cleaning surface, a large amount of outside air is sucked in from the leak air path, so the turbine rotation does not increase and the noise is low, but during cleaning, the leak air path is completely blocked by the cleaning surface. Therefore, the driving efficiency of the rotating brush is low, and the dust removal efficiency is poor.

In addition, as shown in Japanese Utility Model Application No. 58-43352, a brake cover is rotatably attached to the open end of the pipe cover provided in front of the rotary pipe via a coil spring, and the brake cover is attached to the main body case. There is one in which a brake cover is provided with a brake rib so that when the main body case is lifted up, the brake cover is pushed by the brake brake rib to brake the turbine. A problem with such a structure is that the structure is extremely complex. Furthermore, since the turbine is surrounded by a pipe cover and a brake cover, consideration must be given to the positional relationship with the nozzle that blows onto the turbine, and there is also the problem that it may obstruct the intake airflow.

Purpose of the Invention The object of the present invention is to obtain a suction port body for a vacuum cleaner that produces low noise when the main body case is lifted from the surface to be cleaned, and that maintains good dust removal efficiency during cleaning. It is.

SUMMARY OF THE INVENTION This invention provides a main body case to which a rotary tube connected to an extension tube is attached so as to be able to move up and down, and when the extension tube is lifted and the main body case is lifted above the surface to be cleaned, the force due to the weight of the main body case is reduced. We installed a brake that floats and makes contact with the turbine fan shaft.
When the main body case is lifted, the turbine is braked and does not rotate at high speed, so there is no increase in noise.The turbine is not braked during cleaning, so the rotating brush is driven well to maintain good dust removal efficiency. It is something.

Embodiment of the Invention A first embodiment of the invention will be described based on FIGS. 1 to 4. First, the main body case 1 is formed by combining an upper case 2 and a lower case 3. A brush chamber 5, a turbine chamber 6, and a bearing chamber 7 are formed in the main body case 1 by a partition wall 4. The brush chamber 5 and the turbine chamber 6 are formed to communicate with each other. A rotating brush 8 is rotatably housed in the brush chamber 5. A turbine 9 is rotatably housed in the turbine chamber 6. This turbine 9 has a fan 11 attached to one end of a fan shaft 10 and a sleeve 12 attached thereto, and this sleeve 12 is held by the partition wall 4. A belt 1 is attached to the fan shaft 10 and the rotating brush 8 in the bearing chamber 7.
3 is suspended. Then, the main body case 1
A partition plate 14 that partitions the brush chamber 5 and the turbine chamber 6 is housed in the housing. This partition plate 14
A vent hole 15 is formed in the vent hole 15, and a nozzle 16 located in front of the fan 11 is formed in the vent hole 15. In front of this partition plate 14, an opening/closing plate 17 for opening and closing the vent 15 is provided in a slidable manner. This on-off valve 17 opens only the nozzle 16.

A rotary tube 18 is attached to the main body case 1 so as to be movable up and down. This rotating tube 1
8 is formed by rotatably coupling a cylindrical portion 19 along the front-back direction and a cover portion 20 along the left-right direction. An extension pipe (none of which is shown) connected to a dust collection part of a vacuum cleaner is fitted into this cylindrical part 19. The cover portion 20 is attached to the partition wall 4 so as to cover the fan 11 with a front opening. That is, the shaft 21 on the left side of the cover part 20 is rotatably attached to the bearing 22 of the partition wall 4, and the C-shaped flange 23 on the right side of the cover part 20 is rotatably attached to the bearing part 24 of the partition wall 4. Can be installed freely. The shaft 21 and the flange 23
The axes of the fan shaft 10 are formed on the same line, and these axes are provided at different positions from the axis of the fan shaft 10. That is, a brake 25 is formed at the lower part of the flange 23, and comes into contact with the fan shaft 10 when the rotary tube 18 is rotated downward.

Further, a suction port 26 communicating with the brush chamber 5 is formed in the lower case 3.

In such a configuration, the main body case 1 does not have a leakage path, so the structure is simplified. Further, when an electric blower (not shown) of a vacuum cleaner is driven, suction air is concentrated and flows into the turbine chamber 6 from the nozzle 16 .

When cleaning is performed with the rotary tube 18 rotated upward as shown in FIG. 4a, the turbine 9 is hit with the suction air in a concentrated manner, thereby increasing its driving efficiency. Thereby, the dust removal efficiency of the rotating brush 8 is good.

Next, when the extension tube is lifted and the main body case 1 is lifted off the cleaning surface, the main body case 1 rotates under its own weight and becomes the state shown in FIG. 4b. Then, the brake member 25 formed on the rotary tube 18 comes into contact with the fan shaft 10, so the turbine 9 is braked and its rotational force is suppressed, resulting in low noise.

Next, a second embodiment of the present invention will be described based on FIG. 5. The same reference numerals are used for the same parts as in the first embodiment, and explanations are omitted (the same applies hereinafter).
In this embodiment, a C-shaped brake element 27 made of a synthetic resin with band abrasion resistance is attached to the inner surface of the flange 23. That is, brake 2
Fitting pieces 29 that fit into the fitting grooves 28 of the flange 23 are formed at the upper and lower ends of the flange 7, and fitting ribs 30 that fit into the cover portion 20 are formed on the left and right sides thereof. Therefore, the wear of the brake element 27 in contact with the fan shaft 10 is small, and the wear of the rotary tube 18 is prevented.

Effects of the Invention Since the present invention is constructed as described above, when the main body case is floated, the drive of the turbine and rotating brushes is regulated by the brake, so that the noise can be reduced, and therefore the cleaning can be carried out easily. Even if the main body case is floated inside, the noise does not increase, making it comfortable to use.The structure around the turbine is simple, so the inside of the turbine chamber is clean and the suction airflow is reduced. Since the turbine is not braked during cleaning, the rotary brush can be driven well and dust removal efficiency can be maintained well.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the first embodiment of the present invention, Fig. 2 is an exploded perspective view thereof, Fig. 3 is an exploded perspective view of its main parts, and Figs. 4 a and b show the rotating tube up and down. FIG. 5 is an exploded perspective view showing a second embodiment of the present invention. 1...Body case, 8...Rotating brush, 9...
Turbine, 13... Belt, 18... Rotating tube, 2
5, 27, 31...Brake.

Claims (1)

[Claims] 1. A rotary tube is formed by a cylindrical portion connected to an extension tube and a cover portion, and a shaft and a C-shaped flange are formed on both sides of the cover portion, and this rotary tube is connected to the shaft and the flange. A rotary brush and a turbine having a fan shaft disposed within the flange of the rotary tube are connected and housed in the body case by a belt, and the rotary tube The flange is provided with a brake that applies a braking force to the fan shaft of the turbine by receiving force from the body case's own weight when the extension pipe is lifted and the body case is lifted above the cleaning surface. A suction port body for a vacuum cleaner characterized by having the following features: