JP7081970B2 - Vacuum cleaner mouthpiece and vacuum cleaner with it - Google Patents

Description

The present invention relates to a mouthpiece of an electric vacuum cleaner and an electric vacuum cleaner including the mouthpiece.

As a background technique in this technical field, there is Japanese Patent No. 6105886 (Patent Document 1). The mouthpiece of the vacuum cleaner disclosed in this publication includes a case body that can move in the front-rear direction, an electric motor, and a case body that is rotatably arranged on the case body and driven by the electric motor to move dust to the downstream side. The counter-moving direction of the suction body due to contact between the rotating body that leads to the surface to be cleaned, the suction port that opens facing the surface to be cleaned and sucks dust, and the surface to be cleaned that is rotatably arranged in front of and behind the suction port. The one located on the front side in the moving direction tilts upward toward the suction port and faces the lower side of the rotating body, and the one located on the rear side in the moving direction with respect to the surface to be cleaned. It is equipped with an upright cleaning member.

Japanese Patent No. 6105886

An object of the present invention is to provide a mouthpiece of an electric vacuum cleaner capable of more reliably sucking dust of various sizes and light operability, and an electric vacuum cleaner provided with the mouthpiece.

INDUSTRIAL APPLICABILITY The present invention has a case body having a suction port on the lower surface, a suction port that communicates with a vacuum cleaner body that generates suction force and sucks dust, and is rotatably arranged behind the suction port with respect to the case body. A rear flap is provided, and the rear flap forms an opening between a contact rotating portion that rotates in contact with the floor surface when the case body is moved backward and a surface to be cleaned when the case body is moved backward . A flap portion that closes the opening when the case body is advanced is provided, and the flap portion is in a state of being inclined forward with respect to the surface to be cleaned when the opening is closed, and the lowermost portion thereof is tilted forward. It is characterized in that it is in contact with or near the surface to be cleaned.

According to the present invention, the flaps located on the front side in the moving direction of the case body open to form an opening for the surface to be cleaned both when the suction body moves forward and backward, and the flaps located on the rear side in the moving direction of the case body are formed. By closing it in a slanted state and ensuring the airtightness with the floor, it is possible to more reliably suck dust of various sizes, and it is equipped with a mouthpiece of an electric vacuum cleaner with light operability. Can provide a vacuum cleaner.

It is an external perspective view which shows the whole of the electric vacuum cleaner which concerns on this invention. It is a top view of the mouthpiece of Example 1 which concerns on this invention. It is a bottom view of the mouthpiece of Example 1 which concerns on this invention. It is a side view of the mouthpiece of Example 1 which concerns on this invention. It is a top view of the state which removed the upper part of the mouthpiece of Example 1 which concerns on this invention. FIG. 2 is a cross-sectional view taken along the line AA of the mouthpiece shown in FIG. 2 when the mouthpiece is advanced. FIG. 2 is a cross-sectional view taken along the line AA of the mouthpiece shown in FIG. 2 when the mouthpiece is retracted. It is a perspective view of the mouthpiece body at the time of advancing of Example 2. FIG. It is a perspective view of the mouthpiece body at the time of advancing of Example 3. FIG. It is a perspective view of the mouthpiece body at the time of advancing of Example 4. FIG. It is a perspective view of the front flap 76D. It is a perspective view of the front flap 76E. It is a perspective view of the rear flap 77F. It is a perspective view of the mouthpiece case 10 in a state where the bearing holding member 32 is removed.

Hereinafter, examples according to the present invention will be described with reference to the drawings.

Hereinafter, Example 1 according to the present invention will be described with reference to the drawings. FIG. 1 shows an external view of the vacuum cleaner according to the first embodiment of the present invention. The electric vacuum cleaner 1 is composed of a vacuum cleaner main body 2, an operation pipe 4 connected to a hose portion 3 and provided with a hand operation switch SW and the like, an extension pipe 5 provided expandably and contractably, and a mouthpiece 6. ing.

The vacuum cleaner main body 2 includes an electric blower 2a that generates a suction force, a dust collecting unit 2b that collects dust collected by the suction force of the electric blower 2a, and the like. In this embodiment, a so-called cyclone type vacuum cleaner will be described as an example, but it may be applied to a so-called paper pack type vacuum cleaner.

One end of the hose portion 3 is connected to the connection port 2c of the vacuum cleaner main body 2 so as to communicate with the dust collecting portion 2b of the vacuum cleaner main body 2. Further, the other end of the hose portion 3 is connected to one end of the operation pipe 4.

The operation tube 4 includes a handle 4a provided with a hand operation switch SW and the like, a power supply terminal (not shown) to be supplied with power from the vacuum cleaner main body 2. An energization terminal (not shown) provided at one end of the extension pipe 5 is connected to the power supply terminal.

By operating the hand operation switch SW of the operation tube 4, it is possible to operate and stop the electric blower 2a, switch between strong, medium and weak, and operate and stop the electric motor 40 (see FIG. 5) provided in the mouthpiece 6. ing.

The extension pipe 5 includes an outer pipe 5a and an inner pipe 5b, and one end of the inner pipe 5b is inserted into the other end of the outer pipe 5a to be provided inside the outer pipe 5a and the inner pipe 5b (not shown). The ventilation passages are connected so as to communicate with each other, and are configured to be expandable and contractible. Note that FIG. 1 illustrates the shortest state of the extension tube 5.

FIG. 2 is a top view of the mouthpiece. As shown in FIG. 2, the mouthpiece 6 includes a mouthpiece case 10 having a substantially T-shape when viewed from above, and a mouthpiece joint 13 connected to the mouthpiece case 10.

The mouthpiece case 10 includes a mouthpiece body 11 formed elongated in the left-right direction (width direction) and a connecting portion 12 connected to the mouthpiece joint 13 at the center of the mouthpiece body 11 in the left-right direction in a top view. .. The connecting portion 12 is formed with a flow path R (see FIG. 3) that allows the mouthpiece main body 11 and the mouthpiece joint 13 to communicate with each other.

The mouthpiece main body 11 is provided with bumpers 11a from the front end surface to the left and right side surfaces. The bumper 11a ensures airtightness inside the mouthpiece body 11 during use, and prevents the furniture and the like from being scratched when the mouthpiece body 11 collides with furniture and the like when the vacuum cleaner 1 (see FIG. 1) is used. It plays the role of a cushioning material that absorbs the impact on the mouthpiece body 11.

The mouthpiece joint 13 includes a first connecting portion 14 that is rotatably connected to the connecting portion 12, and a second connecting portion 15 that is rotatably connected to the first connecting portion 14. There is. The first connecting portion 14 has a substantially D-shape in the top view of FIG. 2, and has a cylindrical shaft 14a connected to the connecting portion 12. The shaft 14a has an axial direction in the left-right direction of the mouthpiece main body 11, and both ends of the shaft 14a are supported by a bearing portion 12g (see FIG. 5) formed in the connecting portion 12. Further, the first connecting portion 14 is configured to be rotatable from a state substantially parallel to a floor surface (cleaning surface) M (see FIG. 4) to a state substantially perpendicular to the floor surface (cleaning surface) M (see FIG. 4). That is, by rotating the first connecting portion 14 with respect to the mouthpiece case 10 with the shaft 14a as a fulcrum, the extension pipe 5 (see FIG. 1) is substantially parallel to the floor surface M (see FIG. 4). It can be rotated between different states.

The second connecting portion 15 is configured to be rotatable with respect to the first connecting portion 14 in the left-right direction of the mouthpiece main body 11 (clockwise and counterclockwise in FIG. 2). Thereby, for example, the extension pipe 5 can be tilted from a state in which the extension pipe 5 is substantially perpendicular to the floor surface M toward a state in which the extension pipe 5 is substantially parallel to the floor surface M. Further, the second connecting portion 15 is provided with a feeding terminal 15a for feeding power. In the electric vacuum cleaner 1 (see FIG. 1) of the present embodiment, the electric power supplied to the mouthpiece 6 is configured to be supplied from the vacuum cleaner main body 2 through the hose portion 3, the operation pipe 4, and the extension pipe 5. There is.

FIG. 3 is a bottom view of the mouthpiece. FIG. 4 is a side view of the mouthpiece. As shown in FIGS. 3 and 4, the mouthpiece 6 includes a rotating brush 20. The suction port case 10 (suction port main body 11) is formed with a brush chamber Q having an opening on the lower surface (the surface facing the cleaning surface) and a pressure equalizing chamber P having an opening (suction port) on the lower surface. ..

The rotary brush 20 is arranged on the front side in the front-rear direction along the left-right direction of the mouthpiece main body 11, and is rotatably supported in the brush chamber Q. Further, the rotary brush 20 is continuously provided from one end side to the other end side in the left-right direction (axial direction of the rotary brush 20) of the mouthpiece main body 11.

Further, the rotary brush 20 includes a plurality of types of brushes 20a, 20b, 20c such as brushes having different hardness, and the brushes 20a, 20b, 20c are arranged in a spiral shape. In the example of the present embodiment, the case where three types of brushes 20a, 20b, and 20c are arranged has been described as an example, but the present invention is not limited to this, and two or less types may be used. There may be four or more types, and a configuration in which a blade member made of an elastic material such as rubber is spirally arranged between the brushes arranged in a spiral shape may be added, and the configuration can be appropriately changed.

The side fixed brushes 70 and 71 are made of an elastic material such as a brush body, and are arranged at both ends in the left-right direction of the mouthpiece case 10 (mouthpiece body 11). The side fixed brushes 70 and 71 improve the airtightness between the brush chamber Q and the pressure equalizing chamber P by closing the gap between the mouthpiece case 10 (mouthpiece body 11) and the floor surface M near both ends in the left-right direction, and are particularly fine. The dust collection performance is improved.

The mouthpiece 6 is provided with a front flap 76, a rear flap 77, a brush drive switch 16, wheels 17, and bearing holding members 31 and 32 on the lower surface of the connecting portion 12 of the mouthpiece case 10.

The front flap 76 includes a flap 76a extending in the axial direction (left-right direction), front contact rotating portions 76b and 76c that receive frictional force from the floor surface M and rotatably operate the front flap portion 76a, and a shaft portion. It is composed of 76d, is arranged forward and parallel to the rotary brush 20, and is continuously rotatably supported from one end side to the other end side in the left-right direction of the mouthpiece main body 11.

Similarly, the rear flap is also composed of a flap 77a extending in the axial direction (left-right direction), rear contact rotating portions 77b and 77c, and a shaft portion 77d for rotatably operating the rear flap portion 77a. It is arranged rearward and parallel to the rotary brush 20, and is continuously rotatably supported from one end side to the other end side in the left-right direction of the mouthpiece main body 11.

The brush drive switch 16 is a switch for detecting whether or not the lower surface of the mouthpiece 6 is in contact with the floor surface M (cleaning surface), and is configured together with the wheels 16a. The wheel 16a is provided so that a part of the wheel 16a always protrudes from the lower surface of the mouthpiece case 10 (connecting portion 12) by an urging means such as a spring. When it is detected that the wheel 16a protrudes from the mouthpiece case 10 and is not in contact with the floor surface M, the electric motor 40 (see FIG. 5) is driven by the control of the circuit board 50 (control board) (see FIG. 5). It is stopped and the rotation of the rotary brush 20 is stopped. Further, when it is detected that the wheel 16a is pushed in and is in contact with the floor surface M, the electric motor 40 is driven by the control of the circuit board 50, and the rotary brush 20 rotates.

The wheel 17 has a role of improving the operation performance of the mouthpiece 6 by bringing the bottom surface of the mouthpiece 6 into close contact with the floor surface M by receiving the stress of the back-and-forth movement and the rotation operation operated by the operation pipe 4. There is. Further, the bearing holding member 31 supports the rotating shaft of the rotating brush 20 and at the same time covers the portions of the front flap 76 and the rear flap 77 of the shaft portions 76d and 77d to be attached to the mouthpiece case 10, and is screwed to the mouthpiece case 10. Is fixed using. The bearing holding member 32 supports the rotating shaft of the rotating brush 20 and at the same time covers the portions of the front flap 76 and the rear flap 77 of the shaft portions 76d and 77d to be attached to the suction case 10, and the suction port is removable so as to be removable. It is fixed to the case 10 by using a lock mechanism (not shown).

FIG. 5 is a top view showing a state in which the upper portion of the mouthpiece case 10 of the mouthpiece body 6 is removed. As shown in FIG. 5, the mouthpiece 6 includes an electric motor 40 for driving the rotary brush 20 and a circuit board 50 for controlling the motor 40 above the rotary brush 20 (see FIG. 3).

The electric motor 40 is attached to one end side of the mouthpiece main body 11 in the left-right direction. Further, the output shaft of the electric motor 40 is arranged in parallel with the left-right direction of the mouthpiece main body 11. Further, the output shaft of the electric motor 40 extends toward one end side in the left-right direction, and is connected to the rotary brush 20 at one end portion (the end portion on the right side in the drawing) in the mouthpiece main body 11 via a toothed belt 41. ..

The circuit board 50 is attached to the side opposite to the motor 40 in the left-right direction of the mouthpiece main body 11. Further, the circuit board 50 has a rectangular board whose long sides are arranged along the left-right direction, and is arranged in the mouthpiece main body 11 with the mounting surface facing upward in the vertical direction. The mounting surface is not necessarily limited to the vertical direction upward, and may be inclined with respect to the horizontal direction, or may be oriented in the front-rear direction (vertically).

6 and 7 are cross-sectional views taken along the line AA in FIG. 2, FIG. 6 shows the time when the mouthpiece 6 moves forward, and FIG. 7 shows the time when the mouthpiece 6 moves backward. In FIG. 6, 63 is a front partition wall separating the brush chamber Q and the pressure equalizing chamber P, and 64 is a rear partition wall separating the rear flap 77 and the pressure equalizing chamber P. In this embodiment, the front partition wall 63 constitutes the first airtightness holding means, and the rear partition wall 64 constitutes the second airtightness holding means.

As shown in FIG. 6, the pressure equalizing chamber P has an opening (suction port) toward the floor surface M, and the other surface is surrounded by the partition wall of the mouthpiece housing, and the flow path shown in FIG. It communicates with R in a flow path. The pressure equalizing chamber P can increase the negative pressure by the front partition wall 63 and the rear partition wall 64.

When the mouthpiece is advanced, the front flap 76 rotates backward (rear side in the moving direction) due to the frictional force between the front contact rotating portions 76b and 76c and the floor surface M, and is between the front flap portion 76a and the floor surface M. Form an opening in. As a result, the relatively large dust D1 located in front of the mouthpiece is sucked into the brush chamber Q, scraped by the rotating brush 20, and sent to the rear of the mouthpiece. Then, it is sucked into the pressure equalizing chamber P through the gap between the front partition wall 63 and the floor surface M, and flows into the flow path R (see FIG. 3).

On the other hand, the rear flap 77 rotates rearward (rear side in the moving direction) due to the frictional force between the rear contact rotating portions 77b and 77c and the floor surface M, and is in contact with the floor surface M or the gap is reduced. It is possible to improve the airtightness inside the mouthpiece and prevent the dust D1 sucked into the pressure equalizing chamber P from being dropped to the rear of the mouthpiece 6. At this time, since the rear flap portion 77a is in contact with the mouthpiece case 10 and is inclined rearward with respect to the vertical direction of the floor surface M, the frictional resistance between the mouthpiece 6 and the floor surface M is small, and the front and rear of the mouthpiece 6 are small. The operation can be performed lightly. Further, depending on the material of the rear flap portion 77a and the contact allowance of the floor surface M, the frictional resistance with the floor surface M may be small, and at this time, the rear flap portion 77a does not have to be tilted backward.

When the mouthpiece is moved backward, the frictional force between the front contact rotating portions 76b and 76c and the floor surface M causes the mouthpiece to rotate forward (rear side in the moving direction) and come into contact with the floor surface M or reduce the gap inside the mouthpiece. It is possible to improve the airtightness of the dust D1 and prevent the dust D1 sucked into the pressure equalizing chamber P from being dropped to the front of the mouthpiece 6. At this time, since the front flap portion 76a comes into contact with the mouthpiece case 10 and is inclined forward with respect to the vertical direction of the floor surface M, the frictional resistance between the mouthpiece body and the floor surface M is small, and the front and rear operation of the mouthpiece body can be performed. It can be done lightly. Further, depending on the material of the front flap portion 76a and the contact allowance of the floor surface M, the frictional resistance with the floor surface M may be small, and at this time, the front flap portion 76a does not have to be inclined backward.

On the other hand, the rear flap 77 rotates forward (rear side in the moving direction) due to the frictional force between the rear contact rotating portions 77b and 77c and the floor surface M, and opens an opening between the rear flap portions 77a and the floor surface M. Form. As a result, the relatively large dust D2 located in front of the mouthpiece is sucked into the pressure equalizing chamber P through the gap between the rear partition wall 64 and the floor surface M, and flows into the flow path R (see FIG. 4).

As described above, the flap located on the front side in the moving direction of the case body opens to form an opening for the surface to be cleaned both when the suction body moves forward and backward, and the flap located on the rear side in the moving direction of the case body opens. By closing it in a slanted state and ensuring the airtightness with the floor, it is possible to more reliably suck dust of various sizes, and it is equipped with a mouthpiece of an electric vacuum cleaner with light operability. It has the effect of being able to provide an electric vacuum cleaner.

Hereinafter, Example 2 according to the present invention will be described with reference to FIG. The same components as those in the first embodiment are assigned the same numbers.

FIG. 8 is a perspective view of the mouthpiece when the second embodiment is advanced. The front flap portion 76Aa of the front flap 76A has a convex portion 76Ae that partially closes the opening formed with respect to the floor surface M. As a result, the dust D1 in front can be sucked from the opening, and the airtightness inside the mouthpiece can be further improved. Further, by bringing the convex portion 76Ae into contact with the floor surface M and scratching the floor surface M, the dust D1 stuck to the floor surface M can be floated and easily sucked.

In this embodiment, the front flap has been described, but the same effect can be obtained by adopting the same structure with the rear flap.

Hereinafter, Example 3 according to the present invention will be described with reference to FIG. The same components as those in the first embodiment are assigned the same numbers.

FIG. 9 is a perspective view of the mouthpiece when the third embodiment is advanced. The flap portion 76Ba of the front flap 76B has a convex portion 76Be that partially closes the opening formed with respect to the floor surface M, and the convex portion 76Be has a surface 76Bf substantially parallel to the floor surface M. As a result, the dust D1 in front can be sucked from the opening, the airtightness inside the mouthpiece can be further improved, and the suction air passes between the surface 76Bf and the floor surface M to pass near the floor surface M. Since the amount of suction air increases, it becomes easier to suck fine dust such as wheat flour and baking soda scattered on the rug.

In this embodiment, the front flap has been described, but the same effect can be obtained by applying the same structure to the rear flap.

Hereinafter, Example 4 according to the present invention will be described with reference to FIG. The same components as those in the first embodiment are assigned the same numbers.

FIG. 10 is a perspective view of the mouthpiece when moving forward according to the fourth embodiment. The flap portion 76Ca of the front flap 76C has a convex portion 76Ce that partially closes the opening formed with respect to the floor surface M, and the convex portion 76Ce has an uneven shape with respect to a direction parallel to the traveling direction. It has an uneven portion of 76 Cg. As a result, the dust D1 in front can be sucked from the opening, the airtightness inside the mouthpiece can be further improved, and the dust D1 that collides with the convex portion 76Ce when the mouthpiece is advanced is guided to the opening by the uneven portion 76Cg. It will be easier. This makes it easier to rush relatively large dust. The uneven portion 76Cg may have an inclined shape instead of the uneven shape.

In this embodiment, the front flap has been described, but the same effect can be obtained by applying the same structure to the rear flap.

Hereinafter, Example 5 according to the present invention will be described with reference to FIG. The same components as those in the first embodiment are assigned the same numbers.

FIG. 11 is a perspective view of the front flap 76D. The front flap 76D is configured by fitting a flap portion 76Da, a contact rotating portion 76Db, and a 76Dc, which are made of separate members, to a metal shaft portion 76Dd made of metal, stainless steel, or the like. At this time, by providing the shaft portion 76Dd with irregularities such as a cross rib and an L-shaped rib, it is possible to prevent the flap portion 76Da, the contact rotating portion 76Db, and the 76Dc from slipping. When the contact rotating portions 76Db and 76Dc are formed of the same material, they may be fitted to the shaft portion 76Dd as an integrated part, or they may be integrally insert-molded into the shaft portion 76Dd. Can be simplified and assembling is improved.

In this embodiment, the front flap has been described, but the same effect can be obtained by applying the same structure to the rear flap.

Hereinafter, Example 6 according to the present invention will be described with reference to FIG. The same components as those in the first embodiment are assigned the same numbers.

FIG. 12 is a perspective view of the front flap 76E. The front flap 76E is configured by fitting the separate contact rotating portions 76Eb and 76Ec formed of a soft member to the flap portion 76Ea in which the shaft portion 76Ed formed of a hard member made of resin or metal is integrated. To. At this time, by providing the shaft portion 76Ed with irregularities such as a cross rib and an L-shaped rib, it is possible to prevent the contact rotating portions 76Eb and 76Ec from slipping. By integrating the shaft portion 76Ed and the flap portion 76Ea, complicated manufacturing processes such as insert molding can be eliminated and the molding process can be simplified. Further, the soft member is often more expensive than the hard member, and by forming only the contact rotating portions 76Eb and 76Ec with the soft member, the amount of the soft member used can be reduced and the cost can be reduced.

In this embodiment, the front flap has been described, but the same effect can be obtained by applying the same structure to the rear flap.

Hereinafter, Example 7 according to the present invention will be described with reference to FIG. The same components as those in the first embodiment are assigned the same numbers.

FIG. 13 is a perspective view of the rear flap 77F. The rear flap 77F is fitted to the fitting portion 77Fe into the flap portion 77Fa having the fitting portion 77e continuously provided in the axial direction in which the shaft portion 77Fd formed of a hard member made of resin or metal is integrated. It is composed of a separate contact rotating portion 77Fb and 77Fc formed of a soft member fitted to the sealing member 77Ff and the shaft portion 77Fd.

By providing the sealing member 77Ff formed of a soft member or a brush member at the tip of the flap portion 77Fa, the opening of the floor surface M can be reduced and the airtightness inside the mouthpiece can be improved without damaging the floor surface M. In addition, since the airtightness inside the mouthpiece can be adjusted by changing the seal member 77Ff, the sticking to the floor surface can be adjusted depending on the application and the model of the vacuum cleaner, and electricity having various forms and suction power can be adjusted. Even with a vacuum cleaner, light operability can be realized without changing the shape of the mouthpiece body.

In this embodiment, the rear flap has been described, but the same effect can be obtained by applying the same structure to the front flap.

Hereinafter, Example 8 according to the present invention will be described with reference to FIG. The same components as those in the first embodiment are assigned the same numbers.

FIG. 14 is a perspective view of the mouthpiece case 10 in a state where the bearing holding member 32 is removed. A spring 100 is provided at the tip of the shaft portion 77Gd of the rear flap 77G, one end of the spring is in contact with the mouthpiece case 10, and the multi-end is in contact with the rib 77Gh provided on the shaft portion 77Gd. As a result, the rear flap 77G cannot move in a state where the mouthpiece is not operated back and forth, or on the floor surface having a small floor surface resistance, and is urged rearward with the opening with the floor surface M closed, and the windbreak that leaks to the rear of the mouthpiece body. Sound can be reduced.

In this embodiment, a configuration in which the flap is urged by a spring has been described, but if the flap can be urged in the closing direction or the opening direction, other means may be used.

In this embodiment, the rear flap has been described, but the same effect can be obtained by applying the same structure to the front flap.

Further, in this embodiment, the mouthpiece of the floor-moving type vacuum cleaner has been described, but the same effect can be obtained even if it is applied to the mouthpiece of a so-called cordless stick type vacuum cleaner.

1 Vacuum cleaner 2 Vacuum cleaner body 2a Electric blower 2b Dust collector 6 Mouthpiece 10 Mouthpiece case 20 Rotating brush 76 Front flap 77 Rear flap 40 Motor 50 Circuit board (control board)
70, 71 Side fixed brush according to Example 1 M Floor surface Q Brush chamber P Pressure equalizing chamber

Claims (8)

A case body having a suction port on the lower surface, a suction port that communicates with a vacuum cleaner body that generates suction force to suck dust, and a rear flap that is rotatably arranged behind the suction port with respect to the case body. Prepare,
The rear flap forms an opening between the contact rotating portion that rotates in contact with the floor surface when the case body moves backward and the surface to be cleaned when the case body moves backward, and advances the case body. With a flap that sometimes closes the opening,
The flap portion is characterized in that when the opening is closed, the flap portion is tilted forward with respect to the surface to be cleaned, and the lowermost portion is in contact with or near the surface to be cleaned. The mouthpiece of an electric vacuum cleaner. The electric vacuum cleaner according to claim 1, wherein the flap portion has at least one convex portion that partially closes an opening formed between the surfaces to be cleaned when the flap portion is opened. Mouthpiece . The mouthpiece of an electric vacuum cleaner according to claim 2, wherein the convex portion has a surface substantially parallel to the surface to be cleaned at the lower portion . The mouthpiece of the vacuum cleaner according to claim 2, wherein the convex portion has an uneven shape or an inclined shape in a direction parallel to the traveling direction of the case body. The rear flap is formed by integrating a shaft formed of a hard member of resin or metal which is fixed to the case body and serves as a center of rotation, and the contact rotation formed of a soft member. The mouthpiece of a vacuum cleaner according to any one of claims 1 to 4 , characterized in that it is composed of a moving portion . The mouthpiece of an electric vacuum cleaner according to any one of claims 1 to 5 , wherein the flap portion is provided with a brush member or a soft member at the tip thereof . The electricity according to any one of claims 1 to 6 , wherein the rear flap is provided with a means for urging the rear flap in the opening direction or the closing direction of the rear flap . Vacuum cleaner mouthpiece . A vacuum cleaner comprising the mouthpiece of the vacuum cleaner according to any one of claims 1 to 7.

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