JP3501891B2 - Electric vacuum cleaner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner having an improved grip for operating a floor suction tool.

[0002]

2. Description of the Related Art FIG.
It is a longitudinal cross-sectional view which shows an example of the grip of the conventional vacuum cleaner disclosed by the publication.

In the figure, reference numeral 1 is a grip, which is an extension tube 2 formed in a straight tube on the upstream side and a bendable hose 3 on the downstream side.
Are attached respectively. The other end of the extension pipe 2 is connected to a floor suction tool (not shown), and the other end of the hose 3 is connected to a cleaner body (not shown). Also,
The grip 1 is a hollow bent pipe 4 formed in a substantially V shape.
And a hollow handle 5 attached to the bent hype 4, and a grip space 6 is formed between the bent pipe 4 and the handle 5. Reference numeral 7 is a dust indicator housed in the handle 5 so that one end communicates with the bent pipe 4 and the other end communicates with the outside air, which is displayed in conjunction with each other when a predetermined pressure difference occurs between the bent pipe 4 and the outside air. .

Next, the operation of the electric vacuum cleaner configured as described above will be described. First, the cleaner body (not shown)
When an electric blower (not shown) housed in
The dust sucked by the floor suction tool (not shown) moves linearly in the extension pipe 2 at high speed. When most of the outside air including dust passes through the bent pipe 4, it collides with the inner wall of the bent portion of the bent pipe 4 due to an inertial force, changes its direction, and passes through the hose 3 to be sucked into the cleaner body. Also,
If the tip of the extension pipe 2 is blocked by large dust or carpet,
Since the outside air does not pass through the electric blower, the electric blower abnormally heats up, but at this time, the dust indicator operates to display the abnormality and introduces the outside air into the bending pipe 4 to prevent abnormal heating of the electric blower. To do.

[0005]

In the conventional electric vacuum cleaner as described above, of the dust that has been sucked and has advanced linearly through the extension tube 2, the larger the mass, the larger the inertial force, and the bent pipe. It collides with the inner wall of the bent portion of 4 and changes its direction. Therefore, the collision is likely to occur again, abnormal noise is generated, and the inner wall of the bent portion is damaged. Also, the dust indicator 7
Since one end of is exposed inside the bent pipe 4, dust easily collides with it, and the suction force is weakened because it blocks the air passage. Furthermore, since the handle 5 is formed as a separate component so as to wrap the bent pipe 4 in a double manner, the grip 1 becomes heavy and has a complicated structure.

The present invention has been made in order to solve the above-mentioned problems, and integrally bends the bent pipe and the handle so as to communicate with each other to weaken the inertial force of the sucked dust.
An electric vacuum cleaner that prevents damage to the inner wall of a bent pipe.

[0007]

An electric vacuum cleaner according to the present invention has a hose connected to a cleaner body, an extension pipe connected to a floor suction tool, and one end attached to the hose and the other end. A substantially V-shaped bent pipe connected to the extension pipe, and a grip made of a hollow handle having one end opened to communicate with the bent pipe and the other end closed. A communication hole for introducing outside air is formed in the.

An opening / closing tool for opening and closing the communication hole is provided on the grip.

[0009]

DETAILED DESCRIPTION OF THE INVENTION

Embodiment 1. FIG. 1 is an overall perspective view of an electric vacuum cleaner showing a first embodiment of the present invention, and FIG. 2 is a vertical sectional view of the grip shown in FIG. In FIG. 1, 20 is a cleaner body having an electric blower (not shown), 21 is a bendable hose, one end of which is detachably connected to the cleaner body 20. Reference numeral 22 is a grip made up of a bent pipe 29 and a grip 31, one end of which is detachably connected to the hose 21 and the other end of which is detachably connected to the extension pipe 23. The extension pipe 23 is composed of a plurality of straight pipes. 24 is an extension tube 2 at one end
It is the suction tool for floors attached to 3.

Next, the structure of the grip 22 composed of the bent pipe 29 and the grip 31 will be described with reference to FIG. In the figure, the solid arrows indicate the air flow containing the sucked dust,
The dotted arrow indicates the external airflow from the communication hole. As shown in the figure, the bent pipe 29 is formed in a substantially V shape, and the bent portion 25
And the extension pipe 23 located upstream of the bent portion 25.
Is composed of an extension pipe support portion 26 that is detachably fitted and supported, and a straight pipe portion 28 that is located on the downstream side and is rotatably connected to the hose 21 by a connector 27. Further, the handle 31 is formed in a hollow shape having a substantially V-shape, and the connection portion 30 at the end portion is formed.
Is connected to the upper surface of the bent pipe 29 near the bent portion 25,
It is formed so as to extend upward from the connecting portion 30 in a substantially tapered shape. The inside of the handle 31 and the bent pipe 29 are integrally formed so as to communicate with each other inside. Reference numeral 32 is a communication hole formed in the other end of the handle 31 for introducing outside air. Reference numeral 33 is a gripping space formed between the bent pipe 29 and the grip 31 for gripping the grip 31 and supporting it from below. A switch 34 controls the rotation of an electric blower (not shown) fixed to the connector 27.

Next, the operation of the electric vacuum cleaner configured as described above will be described. When the switch 34 is operated to operate the electric blower, dust is sucked together with the outside air from the floor suction tool 24 and linearly advances through the extension pipe 23 as shown by a solid arrow, and travels at the bent portion 25 of the bent pipe 29. change. Then, the dust having a particularly large mass has a strong inertial force, and enters into the handle 31 formed above the bent pipe 29 through the connection portion 30. At this time, as shown by a dotted arrow, outside air is sucked into the handle 31 through the communication hole 32,
Since it flows toward the bent pipe 29, it exerts a reaction force on the dust that is about to enter the inside of the handle 31, and the bent portion 25
Can be moved smoothly.

Embodiment 2. 3 is a longitudinal sectional view showing a grip according to a second embodiment of the present invention, and FIG. 4 is a perspective view of the opening / closing tool shown in FIG. In the figure, the solid arrow indicates the air flow containing the sucked dust, and the dotted arrow indicates the external air flow from the communication hole. In the figure, 31A is a handle integrally formed with the bent pipe 29, and has an annular recess 35 at the end. 32A is a communication hole formed in the recess 35 for introducing outside air. 36
Is an opening and closing tool that is formed in an annular shape and is rotatably fitted in the recess 35, and is provided with an outside air introduction hole 37 having substantially the same shape as the communication hole 32A.

In the vacuum cleaner constructed as described above, first, the state in which the communication hole 32A is closed by the opening / closing tool 36 will be described. When the switch 34 is operated to operate the electric blower (not shown), the dust is sucked together with the outside air from the floor suction device (not shown), and the extension pipe 23 is linearly advanced as shown by a solid arrow. Handle 3 due to the inertial force acting on
Although it enters the inside of 1A, it is decelerated by the air in the handle 31A, stopped by the inner wall of the handle 31A, etc., and enters the bending pipe 29 again by its own weight, etc., and an electric blower (not shown).
Is sucked into. At this time, a relatively lightweight object such as cotton dust is accumulated in the handle 31A, but it also has an effect of acting as a cushion for the heavy dust that enters.

Next, when the suction force from the floor suction tool is weakened and used, the communicating hole 32A and the outside air introducing hole 37 are aligned with each other so that the outside air can communicate with the outside hole 3 as shown by the dotted arrow.
2A and the outside air introducing hole 37 enter the inside of the handle 31A, join the outside air containing dust from the floor suction tool by the bending pipe 29, and are sucked by an electric blower (not shown). At this time, the suction force from the floor suction tool may be adjusted by rotating the opening / closing tool 36. By introducing the outside air through the communication hole 32A and the outside air introducing hole 37, dust accumulated in the handle 31A is also carried into the bending pipe 29 together with the outside air. Further, it is apparent that the same effect as that of the first embodiment can be obtained by adjusting the opening / closing tool 36 and introducing the outside air into the handle 31A.

Embodiment 3. 5 and 6 show the third embodiment of the present invention.
FIG. 6 is a partially cutaway vertical sectional view showing the handle of the embodiment, and FIG. 6 shows a state in which the safety valve device operates. In the figure, a dotted arrow indicates a state in which outside air passes through the safety valve device 39.
In the figure, 31B is a handle integrally formed with the bent pipe 29, and an opening 38 is formed at the end. 39
Is a safety valve device that is an opening / closing device that opens and closes the opening 38, and is stored near the opening 38 of the handle 31B. The safety valve device 39 includes a tubular body 42 having a valve seat 41 having an inlet 40 on one side, and an outlet 4 formed at the other end of the tubular body 42.
3, a valve body 45 slidably accommodated in the tubular body 42, and a compression spring 46 provided to press the valve body 45 against the valve seat 41 with a predetermined pressure to close the inlet 40. It is composed by.

In the vacuum cleaner constructed as described above, the floor suction device (not shown) accidentally sucks newspaper or a piece of cloth during cleaning, and the suction port (not shown) is closed. In this case, since the outside air is not sucked from the floor suction tool, the electric blower (not shown) has a low pressure on the upstream side. At this time, the handle 31B communicating with the bent pipe 29 also has a low pressure, and the valve body 45 separates from the valve seat 41 and opens the inlet 40. As a result, the outside air enters through the inlet 40, passes through the inside of the handle 31B, passes through the bent pipe 29, and cools the electric blower.

Although there are many cases in which the suction port of the floor suction device is blocked during cleaning as described above, according to the present embodiment, the safety valve device 39 operates to reliably cool the electric blower. effective. Further, dust accumulated in the handle 31B can be reliably operated by the operation of the safety valve device.
It can be moved to 9.

Also, the safety valve device 39 can be easily operated by removing the extension tube from the grip 22 and closing the extension tube support portion 26 for a few seconds with a hand, etc.
The dust inside can be easily and surely moved to the bent pipe 29 and removed.

[0019]

As described above, according to the present invention, the hose connected to the cleaner body, the extension pipe connected to the floor suction tool, the one end attached to the hose and the other end attached to the extension pipe as described above. The grip includes a connected substantially V-shaped bent pipe and a hollow handle that is open at one end and communicates with the bent pipe and the other end is closed, and introduces outside air to the other end of the handle. Since the communication hole is formed, the dust that enters the handle by the inertial force from the extension pipe is pushed back to the bending pipe by the outside air sucked from the communication hole, so that the dust smoothly passes with the air flow inside the bending pipe. It is a thing. Since the outside air is always introduced through the communication hole, it is possible to prevent dust from accumulating inside the handle.

Further, since the communication hole for introducing the outside air provided in the handle is formed so as to be freely opened and closed by the opening / closing tool, the suction air flow from the floor suction tool can be adjusted and the handle can be opened when the outside air introducing hole is opened. When the outside air passes through the inside, dust that jumps into the handle can be pushed back to the bent pipe.

[0021]

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire electric vacuum cleaner according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a grip portion according to the first embodiment of the present invention.

FIG. 3 is a vertical sectional view of a grip portion according to a second embodiment of the present invention.

FIG. 4 is a perspective view of an opening / closing tool according to a third embodiment of the present invention.

FIG. 5 is a partially cutaway vertical sectional view of a grip portion according to a third embodiment of the present invention.

FIG. 6 is a partially cutaway vertical sectional view of a grip portion according to a third embodiment of the present invention, showing a state in which a safety valve device operates.

FIG. 7 is a vertical cross-sectional view showing a conventional grip.

[Explanation of symbols]

22 grips, 25 bent parts, 29 bent pipes, 31
Handle, 32 communication hole, 36 opening / closing tool, 37 outside air introduction hole, 39 safety valve device

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takanobu Ueoka 1728 Omaeda, Ozono-gun, Hanazono-cho, Saitama Prefecture 1 Mitsubishi Electric Home Equipment Co., Ltd. (56) Reference JP-A-6-78868 (JP, A) Actual Development 63-30941 (JP, U) Actual development 59-45060 (JP, U) Actual development 55-95637 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) A47L 9 /twenty four

Claims (2)

(57) [Claims] 1. A hose connected to a cleaner body, an extension pipe connected to a floor suction tool, and a substantially V-shaped bend having one end attached to the hose and the other end connected to the extension pipe. The pipe and one end is opened to communicate with the bent pipe and the other end
Is a grip made of a closed hollow handle, and a communication hole for introducing outside air is formed at the other end side of the handle. 2. The vacuum cleaner according to claim 1, wherein an opening / closing tool for opening / closing the communication hole is provided on the grip.