JP2002045316A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplifiy a structure which opens and closes a blocking plate 70 of a sucking opening body 2. SOLUTION: A dust sucking opening 34 is formed from a lower face to all over the face, and the blocking plate 70 which opens and closes the whole face side of the dust sucking opening 34 is provided. The blocking plate 70 journals an arm 71 which extends backward, and opens and closes the whole face side of the dust sucking opening 34 by a rotating operation centering at the journal point. On the other hand, an elastic body which excites an end part of the arm 71 always upward is provided. An operation body locks the arm 71 at the lower end part by a first operation, and releases the lock at the end side of the arm 71 by a second operation.

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, and more particularly, to an upright type electric vacuum cleaner having a motor-driven wheel and a suction port containing a rotary brush.

[0002]

2. Description of the Related Art Heretofore, in this type of motor, a dedicated motor for driving wheels has been used, or a single motor has also been used for driving a rotary brush. In each case, gears and belts machined on the shaft of the electric motor are used as means for reducing the rotation of the electric motor and transmitting it to the wheels and the rotating brush.

[0003] The wheels are connected to a single axle, and the two wheels are simultaneously rotating in the same direction and at the same speed.

[0004] Furthermore, the contact surface of the wheel with the cleaning surface is entirely flat or has irregularities, so that the floor surface,
On folding and carpets, they were running on the same wheels.

In general, in an upright type vacuum cleaner, as shown in FIG. 15, a vacuum cleaner main body 101 and a suction port body 102 are connected to be able to descend, and the vacuum cleaner main body has a handle 103. A handle 104 is provided,
The dust sucked from the suction port body 102 is removed from the cleaner body 1.
Suction hose 105 for feeding into a dust collecting bag (not shown) in the vacuum cleaner main body 101 and suction port body 10.
2 and connected to it.

When cleaning, the handle 104 provided on the cleaner main body 101 is extended, the handle 103 is gripped, and the cleaner main body 101 is moved back and forth for cleaning.
The position of the handle 103 at that time is determined by the user and the vacuum cleaner main body 1.
01, the handle 103 remains in the housed state after the cleaning is completed, as shown in FIG.
1.

Further, when the suction port absorbs dust near the wall or the corner of the furniture, in order to improve the dust-absorbing performance, a shielding plate is provided for opening and closing the front surface from the lower surface of the dust suction opening of the suction port. The board was being opened. As the opening means, a wave type operation body as described in Japanese Utility Model Application Laid-Open No. 63-136554 is provided, and the shielding plate is opened and closed by moving the operation body back and forth.

[0008]

The above-mentioned conventional vacuum cleaner has the following problems.

The wave button is switched back and forth by means of a leaf spring as means for opening and closing the shield plate of the suction opening. The spring pressure of the leaf spring serves both as the operating force of the wave button and the positioning of the shield plate, that is, the arm. . However, if the spring pressure is reduced to lighten the operation of the wave button, the positioning of the arm becomes unstable, and the shielding plate may be switched by an impact during cleaning.

On the other hand, if the spring pressure is increased, there is a problem that it is difficult to operate the button. The spring pressure of the leaf spring is very severe in design and the allowable range is very small. Therefore, there are various restrictions on the material and shape of the spring, and there is a problem in parts management.

[0011]

Means for solving the above problems are as follows.

In a vacuum cleaner having a built-in electric blower, a dust collecting chamber, a cleaner body, and a suction port having a dust suction opening on the lower surface, the dust suction opening extends from the lower surface to the front surface. And a shield plate for opening and closing the front side of the dust suction opening. The shield plate pivotally supports an arm extending rearward, and the front surface of the dust suction opening is pivoted about the pivot point. An open / close side is provided, and an elastic body that constantly urges the rear end of the arm upward is provided, and an operating body that moves the rear end of the arm up and down is provided. Is locked below the rear end, and the rear end of the arm is unlocked by the second operation.

According to the present invention, since the above-mentioned structure is used, as the means for opening and closing the shielding plate, the operation is alternately performed between the lock operation and the release operation by the operation of the push button. Since it is not necessary to provide the force and the holding force of the arm on the same elastic body, the structure is simple and the opening and closing of the shielding plate can be reliably performed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a main part of a side surface of a vacuum cleaner according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a rear view thereof.

1 to 3, a cleaner main body 1 and a suction port 2 are connected so as to be able to descend, and dust is sucked into the cleaner main body 1 from the suction port 2 and a suction hose 3. An electric blower 4, a dust collecting bag 5 for collecting sucked dust, and a cord reel 6 for accommodating a power cord 6a.
And built-in.

The dust-collecting bag 5 is made of paper and has a thick mouthpiece 5a having an air inlet 7 adhered thereto. The dustbag 5 is attached to the dust-collecting chamber 8 inside the cleaner body 1 with the mouthpiece 5a. I have. The dust collecting chamber 8 is closed by a lid 9 and is opened and closed when the dust collecting bag 5 is attached and detached.

The lid 9 is provided with an alarm 10 for notifying the user that the dust bag 5 is full when the dust bag 5 is full of dust. 10
When the dust is full, the amount of air passing through the dust collecting bag 5 becomes extremely small, so that the amount of intake air to the electric blower 4 decreases, the cooling effect of the electric blower 4 decreases, the temperature rises, and there is a risk of burning. is there. Therefore, in order to prevent the temperature of the electric blower 4 from rising, the air blower 4 also has a function as an outside air inlet 11 for directly passing outside air through the dust collection chamber 8 and supplying the same to the electric blower 4. The annunciator 10 operates when the air volume drops below a certain level.

In the intake air sucked together with the dust by the electric blower 4, the dust is collected by the dust collection bag 5, and the fine dust passing through the dust collection bag is collected by the filter 12 provided at the front of the electric blower 4. The exhaust gas collected and passed through the electric blower 4 is discharged to the outside of the cleaner main body 1 from an exhaust port 13 provided on a side surface of the cleaner main body 1.

A suction hose (hereinafter referred to as a hose) 3 is connected between the suction opening 2 and the cleaner main body 1 to form an intake passage. If the hose 3 is detached from the suction port body 2 and a clearance nozzle 14 as an attached suction tool is attached to the end thereof, it is possible to clean a cleaning portion that cannot be cleaned by the suction port body 2.

A handle 16 having a handle 15 for operating the vacuum cleaner at the time of cleaning is attached to the front surface of the cleaner body 1 so as to be extendable and contractible. When the handle 16 is extended, a handle button 17 provided on the cleaner body 1 is used.
To unlock the handle 16 and release the handle 16
To the top. When you pull out a certain distance, it is automatically locked again.

The handle 15 is provided with operation switches 18 for operating the vacuum cleaner. The operation switches 18 are provided with a switch 19 for turning off the entire power supply, a switch 20 for controlling the rotation of the electric blower for dust suction, and a switch 21 for controlling the rotation brush and the wheel drive of the suction port body. .

A dust collecting meter 23 for notifying the amount of dust collected by the dust collecting bag 5 is provided at the front central portion 22 of the cleaner body 1. This dust collecting meter 23 is also provided with the above-described annunciator 10.
In the same manner as described above, the cleaner operates by a pressure difference between the outside and the inside of the cleaner body. Reference numeral 24 denotes a detection window of the dust collection meter 23.
Can be confirmed, the dust bag 5 is full. This allows the user to know when to replace the dust bag 5.

The switches 18 provided on the handle 15 and the connecting wires 26 electrically connected to the electric components (not shown) inside the cleaner body 1 and the suction opening 2 are connected to the handle 16.
It is provided inside. The connection wire 26 provided inside the handle 16 is made of a cord that is wound in a spiral shape so as to expand and contract according to the expansion and contraction of the handle 16 and is used.

The cord reel 6 built in the upper part of the cleaner main body 1 is normally urged by a mainspring (not shown) in a direction of winding the power cord 6a. And
When cleaning, the power cord 6a is pulled out by pulling on the insertion plug 27 provided at the end of the power cord 6a to rotate the reel 28. At this time, reel 2
8 is braked by a brake roller 29 and a spring (not shown), so that even when the plug 27 is released, the power cord 6a stops at that position and is not rewound. When rewinding the power cord 6a, pressing the cord reel button 30 releases the brake on the reel 28, rotates the reel 28, and winds up the power cord 6a.

The handle 15 is provided with a cord hooking portion 31 for hooking the power cord 6a during cleaning so that the power cord 6a does not interfere.

Next, the suction port 2 will be described in detail with reference to FIGS.

FIG. 4 is an internal plan view for explaining in detail the structure of only the suction port of the vacuum cleaner of the present invention, FIG. 5 is also a rear view, FIG. FIG. 8 is an internal plan view of a reduction gear using planetary gears, FIG. 8 is a self-propelled wheel used for a suction port body, (a) is a front view of the self-propelled wheel, (b) is a side view of the self-propelled wheel, and FIG. FIG. 9A is a side view for explaining the state of the self-propelled wheels at the time of cleaning on a floor or a folding surface, and FIG.
(B) is a side view explaining the state of the self-propelled wheel at the time of cleaning on a carpet.

The suction port body 2 includes an upper case 32 and a lower case 33.
At the bottom of the lower case 33, a dust suction opening 34 is provided, and small wheels 35, 35 and self-propelled wheels 36, 36 are rotatably supported. The self-propelled wheels 36, 36 are rotated by rotation of a wheel driving motor 37.

A rotating brush 38 is provided facing the dust suction opening 34.
At 9 and 39, they are rotatably supported. The rotating brush 38 is rotated by the rotation of a rotating brush driving electric motor 40 being reduced and transmitted by a gear (pinion) 42 formed on a shaft 41 of the electric motor and a belt 43.

The self-propelled wheels 36, 36 and the wheel driving motor 37 are rotated by the rotation of the wheel driving motor 37 via a reduction gear and a transmission device. The speed reducer 44 directly connected to the electric motor 37 uses a planetary gear 45. As shown in FIG.
A planet gear 45 is provided around the planet gear 45, and an internal gear 47 meshing with the planet gear 45 is formed.

In a speed reducer 44 comprising a planetary gear 45, a sun gear 46 is connected to a shaft 48 of the wheel driving motor 37.
(The input shaft), and the planetary gear 45 is directly connected to the output shaft 49. There are various types of reduction ratios using the planetary gears 45 depending on the application. For example, when the rotation directions of the input shaft 48 and the output shaft 49 are the same, the internal gear 47 is fixed, A method of fixing the sun gear 46 is used.

The output shaft 49 has a bevel gear A5
0 is directly connected, and the bevel gear A50 is rotatably provided on the axle 51 of the left wheel of the self-propelled wheel 36.
It is connected to 2. The axles 51, 51 of the self-propelled wheels 36, 36 have differentials 5 called differentials.
3 are provided. The differential device 53 includes two side gears 54, 54 and two pinions 56, 56, and the two side gears 54, 54 are a right side gear 54.
And the left side gear 54, the left wheel axle 51
And the right wheel axle 51.

The two pinions 56, 56 are rotatably mounted with their respective shafts 58, 59 supported by bearings 60, 61. The bearings 60 and 61 are fixed to a bevel gear B52, and when the bevel gear B52 rotates, the bearing 6
The pins 0, 61 and the pinions 56, 56 also rotate simultaneously. As shown in FIG. 4, the self-propelled wheels 36 are rotatably connected to the axle 51 by fitting a stopper 62 to the axle 51. In the present embodiment, one set of the reduction gears 44 is provided, but a plurality of reduction gears may be provided depending on the reduction ratio.

The self-propelled wheels 36, 36 have a flat surface 64 on the inside and an uneven surface 65 on the outside of the contact surface 63 for contact with the cleaning surface. The diameter of the surface 64 and the convex surface 65a is the flat surface 6
4 is larger (FIG. 8).

The handle 16 provided on the cleaner main body 1 is provided so as to be extendable and contractible. However, when the cleaner main body 1 is moved back and forth, the handle 16 slightly moves according to the moving direction of the cleaner main body 1. It is designed to move. In other words, the structure of the handle 16 is such that two micro switches 66 and 67 provided in the cleaner body 1 are turned ON and O by operating the handle 16 back and forth as shown in FIG.
FF is set. The handle 16 is provided with two projections 68 and 69 at positions facing the microswitches 66 and 67.

The two micro switches 66, 67
For example, as shown in FIG. 11, when the handle 16 is pushed forward when the protrusions 68 and 69 are separated from the micro switches 66 and 67, the handle 16 becomes a normal cross as shown in FIG.
Conversely, when the cleaner body is retracted by pulling the handle 16, the microswitches 66, 6
7 is normally open. Therefore, the cleaner body 1
The self-propelled wheel 36 can be controlled to rotate forward when the vehicle is moving forward, and to reverse when the vehicle is moving backward.

The suction opening 1 is provided with a dust suction opening 34 on the lower surface thereof. The dust suction opening 34 is formed from the lower surface to the front surface, and a part of the front surface of the dust suction opening 34 is opened and closed. A shielding plate 70 is provided. The shielding plate 70
Is configured to pivotally support an arm 71 extending rearward and open and close the front side of the dust suction opening 34 by a rotating action about the pivot point 72. And the arm 71
A spring 73 is provided to constantly urge the rear end 71a of the arm 71 upward, and a push button 74 for operating the rear end 71a of the arm 71 up and down is provided. The push button 74
At the lower part, a latch assembly 75 commercially available from Nifco under the name of “floating latch assembly” is provided.

The operation of the latch assembly 75 is shown in FIG.
A detailed description will be given based on. When the push button 74 is pressed, the latch 75a is pushed downward by the lever 74a of the push button 74, and at the same time, the operating rod 76 slides into a groove 75b provided in the latch 75a.
The operating bar 76 stops at the upper part of the lock, and the latch 75a is locked. At this time, the claw 74b provided at the tip of the lever 74a of the push button and the claw 75b of the latch are fitted, and the push button 74 is also locked at that position.

By pushing the push button 74 downward as described above, the arm 71 interlocked with the push button 74
The arm 71 is turned around the pivot point 72 and is pushed down against a spring 73 provided below the arm 71. When the rear end 71a of the arm is lowered, the shielding plate 70 provided at the front of the arm 71 is raised, and the front of the dust suction opening 34 of the suction opening 2 is opened.

When it is desired to close the front opening of the dust suction opening 34 with the shielding plate 70 from the above state, the push button 74 is pressed again. When the push button 74 is pressed again, the latch 75a is pushed upward by the spring 77.
As a result, a force to move upward is exerted, so that the operating rod 76 slides in the groove 75c on the opposite side to which it slides last time, and the operating rod 76 moves upward. This makes the latch 75
The lock of “a” is released, and the push button 74 is pushed up together. When the push button 74 is pushed up, the rear portion of the arm 71 which has been pushed down by the push button 74 is pushed up by the spring 73. That is, when the rear part of the arm 71 is pushed up, the front shielding plate 70 is lowered, and this shielding plate 70 closes a part of the dust suction opening.

In the above embodiment, the commercially available latch assembly 7 is used.
Five means were used, but nothing was limited to this.
The object of the present invention can be achieved as long as the structure is such that it is locked by the first push operation and unlocked by the second push operation.

The upper case 32 of the suction port 2 has a fixed case 78 and a detachable lid 79. The lid 79 is attached to the fixed case 78, and the left and right The lid 79 can be attached and detached by sliding the slide buttons 80 and 81 to the left and right. By removing the lid 79, the upper part of the rotating brush 38 provided on the suction opening body 2 is opened, and when the lint is entangled with the rotating brush 38 or when the rotating brush 38 is replaced, it can be easily attached and detached. it can.

The suction port 2 is connected to the cleaner main body 1 by a hose 3. The hose 3 is a generally used suction hose having suction pipes 3a, 3b at both ends.
The suction pipe 3a is connected to a hose insertion port 82 provided in the suction port body 2, and the other suction pipe 3b is connected 83 to a hose insertion port of the cleaner body. Thereby, a ventilation path is formed with the dust suction opening 34 → the hose 3 → the dust collection bag 5 → the dust collection chamber 8 → the electric blower 4 → the exhaust port 13.

Depending on the type of cleaning, the hose 3 is detached from the suction port 2, and the suction pipe 3a is connected to the suction nozzle 14 as an accessory suction tool to clean a place where the suction port 2 cannot clean. You can also

Next, the operation of the vacuum cleaner of the present invention will be described in detail.

First, the power cord 6a is pulled out from the cord reel 6 with the insertion plug 27 of the power cord 6a, and the plug 27 is inserted into a 100 V AC outlet (not shown). Then, the user pushes the handle button 17 of the handle 16 to pull out the handle 16 from the cleaner body 1 to a predetermined length, and lowers the cleaner body 1 with the handle 15 so that the cleaner body 1 can be easily cleaned. Operate the switches on the operating unit to start driving.

The suction opening 2 is connected to the cleaner main body 1 by a hose 3. The hose 3 is a generally used suction hose having suction pipes 3a and 3b provided at both ends. One suction pipe 3a is connected to a hose outlet 82 provided in the suction port body 2, and the other is used. Is connected to a hose insertion port 83 of the cleaner body 1. Thereby, a ventilation path is formed with the dust suction opening 34 → the hose 3 → the dust collection bag 5 → the dust collection chamber 8 → the electric blower 4 → the exhaust port 13. By moving the suction opening body 2 back and forth on the cleaning surface, dust on the cleaning surface is sucked together with the intake air from the dust suction opening 34, and the dust is collected in the dust bag 5. The exhaust gas is discharged from the cleaner body 1 through the exhaust port 13 while cooling the electric blower 4.

At this time, if the cleaning surface is a carpet, rotating the rotary brush 38 removes lint and the like entangled with the carpet. In addition, the self-propelled wheels 36 provided in the suction port body 2 sink into the carpet, and the uneven surface 65 of the wheels comes into contact, so that light traveling performance can be obtained without slipping on the carpet. Further, in the case of a floor surface or a folding surface, the contact between the wheel and the cleaning surface is performed on the flat surface 64, so that light running performance can be obtained without damaging the cleaning surface (FIG. 9).

In the operation of the self-propelled wheels 36, the self-propelled wheels 36 are controlled to rotate according to the moving direction of the cleaner body 1.
That is, for example, when the cleaner main body 1 is moved forward, the micro switch provided in the cleaner main body 1 is normally turned on by moving the handle 16 within the cleaner main body 1 by a predetermined distance, and the self-propelled wheels 36 are turned on. Rotates forward, and the rotation direction matches the moving direction of the cleaner body, so that the cleaner body moves lighter.

On the contrary, when the cleaner main body 1 is to be moved backward, the micro switches 66 and 67 provided in the cleaner main body 1 are normally operated by moving the handle 16 within the cleaner main body 1 by a predetermined distance. When the cleaner is opened, the self-propelled wheels 36 rotate in the reverse direction, and the rotation direction matches the moving direction of the cleaner body 1, so that the cleaner body moves lighter.

Here, when the suction opening 2 is traveling straight, after the rotation of the wheel drive motor 37 is reduced by the planetary gear 45,
The bevel gear A50 is rotated. When the bevel gear A50 rotates, the bearings 60, 61 provided on the bevel gear B52 and the pinions 56, 56 fixed to the bearings also rotate.
The rotation of the pinions 56, 56 causes the pinions 56, 5 to rotate.
Right side gear 54 and left side gear 5 meshing with 6
4 rotates to rotate the self-propelled wheel 36. At this time, when the traveling direction of the axle 51 is perpendicular to the axis, the left and right self-propelled wheels 36, 36 rotate at the same rotational speed.

When the suction opening 2 is turned rightward during cleaning,
The right self-propelled wheel 36 receives resistance so that rotation stops.
Therefore, the rotational force of the pinion 56 is transmitted only to the left side gear 54, the left self-propelled wheel 36 rotates, and the suction opening 2 smoothly bends to the right.

Conversely, when trying to bend the suction opening body 2 to the left,
Conversely, the self-propelled wheel 36 receives a resistance so that the rotation stops. For this reason, the rotational force of the pinion 56 is transmitted only to the right side gear 54, and the right self-propelled wheel 36 rotates, so that the suction opening 2 is smoothly bent to the left.

When cleaning a corner such as a wall during cleaning, the suction port 2 cannot be moved further forward by the wall. Therefore, in order to improve the dust absorption at the corner, the shielding plate 70 provided at the front portion is opened to increase the amount of intake air. To open the shielding plate 70, the user pushes a push button 74 provided on the upper surface of the suction opening 2, and the arm 7 of the shielding plate 70 is opened.
1 is rotated.

When the push button 74 is pressed, the latch 75
a is pushed by the lever 74a of the push button 74 and moves downward, the operating rod 76 slides into the groove 75b provided in the latch 75a, the operating rod 76 stops at the upper part of the latch 75a, and the latch 75a is locked. You. At this time, the push button lever 74a is provided with a claw 74b provided at the tip.
And the pawl 75b of the latch 75a
Is also locked in that position. Thus, the push button 74
When the arm 71 is pushed downward, the arm 71 interlocked with the push button 74 is opposed to a spring 73 provided below the arm 71, and the arm 71 is rotated about the pivot point 72 and is pushed downward. When the rear end 71a of the arm is lowered, the shielding plate 70 provided at the front of the arm 71 is raised, and the front of the dust suction opening 34 of the suction opening 2 is opened.

When it is desired to close the front opening of the dust suction opening 34 with the shielding plate 70 from the above state, the push button 74 is pressed again. When the push button 74 is pressed again, the latch 75 is subjected to a force to move upward by a spring 77 urged upward.
6 slides in the groove 75c on the opposite side to which it slides last time, and the operating rod 76 moves upward. As a result, the lock of the latch 75 is released, and the push button 74 is also pushed up. When the push button 74 is pushed up, the rear portion of the arm 71 which has been pushed down by the push button 74 is pushed up by the spring 73. That is, when the rear portion of the arm 71 is pushed up, the front shielding plate 70 is lowered, and a part of the dust suction opening 34 is closed by the shielding plate 70.

Depending on the type of cleaning, there may be places where cleaning is not possible with the suction opening 2 of the cleaner body 1. Since the main body 1 of the vacuum cleaner is connected to the suction opening 2 by the hose 3, the suction opening 2
When the suction pipe 3a connected to the hose insertion port 82 provided in the pipe is pulled out and the suction nozzle 14 or the like as an accessory suction tool is connected to the suction pipe 3a, the gap nozzle 1
4 → a hose 3 → a dust collecting bag 5 → a dust collecting chamber 8 → an electric blower 4 → a ventilation path is formed from the discharge port 13, and the dust on the cleaning surface is sucked in from the gap nozzle 14 together with the intake air. The dust is collected in the dust bag 5. The exhaust gas is discharged from the cleaner body 1 through the exhaust port 13 while cooling the electric blower 4. Therefore,
A place where cleaning cannot be performed by the suction port body 2 can be cleaned only by connecting the attached gap nozzle 14 to a hose (FIG. 13).

FIG. 14 is a plan view, corresponding to FIG. 4, of a suction opening according to a second embodiment of the present invention. This suction port body 82 has
Large wheels 83, 83 are provided in addition to the self-propelled wheels 36, 36, and the self-propelled wheels 36, 36 are provided with a reduction gear 44 using a planetary gear 45 for rotating the wheel driving motor 37. The two left and right self-propelled wheels are rotated at the same rotational speed in the same direction by the belt 84. The rest of the structure is the same as the structure described in detail in the first embodiment, so that the detailed description will be omitted here. However, since the suction port body 82 is not provided with the differential device 53 as described in the first embodiment, the traveling performance of the left and right cornering of the suction port body 82 is inferior.

[0060]

As is apparent from the above description, the present invention has the following effects. According to the first aspect, an elastic body that constantly urges the rear end of the arm of the shielding plate upward is provided, and an operating body that moves the rear end of the arm up and down is provided. Since the arm is locked below the rear end and the rear end of the arm is unlocked by the second operation, the opening and closing of the shield plate can be reliably performed with a light operating force, and the cleaning is performed. The opening and closing operation can be reliably performed without the shield plate malfunctioning due to the impact during use of the machine.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a side surface of a vacuum cleaner according to the present invention.

FIG. 2 is a front view of the electric vacuum cleaner.

FIG. 3 is a rear view of the electric vacuum cleaner.

FIG. 4 is an internal plan view for explaining in detail the structure of only the suction opening of the vacuum cleaner of the present invention.

FIG. 5 is a rear view of the suction port body.

FIG. 6 is a longitudinal sectional view of a main part of a side surface of the suction port body.

FIG. 7 is an internal plan view of a reduction gear using a planetary gear.

8A and 8B are self-propelled wheels used for the suction port body, wherein FIG. 8A is a front view of the self-propelled wheels, and FIG. 8B is a side view of the self-propelled wheels.

FIG. 9A is a side view for explaining the state of the self-propelled wheels when cleaning on the floor and the fold, and FIG. 9B is a view for explaining the state of the self-propelled wheels when cleaning on the carpet. It is a side view.

10A is an exploded perspective view illustrating an opening / closing mechanism of a shielding plate according to the present invention, and FIG. 10B is a cross-sectional view of a main part of a floating latch mechanism.

FIG. 11 is a main part structural diagram of forward / reverse rotation control of the wheel drive motor.

FIG. 12 is a control electric circuit diagram of the wheel driving motor.

FIG. 13 is an external side view showing another actual use state of the electric vacuum cleaner according to the present invention.

FIG. 14 is an internal plan view corresponding to FIG. 4 of a suction port body showing a second embodiment of the present invention.

FIG. 15 is an external side view of a conventional vacuum cleaner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 2 Suction port body 3 Hose 4 Electric blower 16 Handle 34 Dust suction opening 36 Self-propelled wheel 37 Wheel drive motor 38 Rotary brush 40 Rotary brush drive motor 44 Reduction gear 45 Planetary gear 50 Bevel gear A 51 Self-propelled Wheel axle 52 Bevel gear B 53 Differential device 64 Flat surface 65 Uneven surface 66, 67 Micro switch 68, 69 Projection 70 Shielding plate 71 Arm 74 Push button 75 Latch

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Koji Ninomiya Inventor F-term in Sharp Corporation 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka (reference) 3B061 AA45 AD05

Claims (1)

[Claims] 1. A vacuum cleaner comprising an electric blower, a dust collecting chamber, a cleaner main body, and a suction port having a dust suction opening on a lower surface, wherein the dust suction opening is provided from a lower surface to a front surface. And a shield plate for opening and closing the front side of the dust suction opening. The shield plate pivotally supports an arm extending rearward and pivots around the pivot to support the dust suction opening. An elastic body that constantly biases the rear end of the arm upward while opening and closing the front side of the arm is provided, and an operating body that moves the rear end of the arm up and down is provided. An electric vacuum cleaner wherein the arm is locked below the rear end, and the rear end of the arm is unlocked by a second operation.