JPH02144029A - Intake port body of vacuum cleaner - Google Patents

Abstract

PURPOSE:To enable dust in corners of a room to be fully efficiently scraped out for complete cleaning by providing a brush body reciprocated by a drive means adjacent to an intake port opening in the front side of the bottom of an intake port body. CONSTITUTION:An intake port body 11 is formed on the inner front side with a brush chamber 15 by a longitudinal partition wall 14 and on the rear side central section with a turbine chamber 18 by left and right partition walls 16, 17. An elongated intake port 21 is formed adjacent to a brush 15 on the bottom of a lower case 12 and a communicating port 22 is opened adjacent to the turbine chamber 18. The interiors of turbine chamber 18 and a joint pipe 23 form a communicating section 24 for affording communication between the intake port 21 and a cleaner body. A pair of longitudinal guide rods 30 are provided between the left and right side faces of the brush chamber 15 to extend through a plate-like brush bed 32 of a brush body 31 and support it reciprocatively left and right. A plurality of flexible brush bristles are planted in the bottom of the brush bed 32. An air turbine 41 as a drive means for driving the brush body 31 is rotatably supported opposedly from the rear to the communicating port 22 in the turbine chamber 18.

Description

[Detailed Description of the Invention] (Objective of the Invention) (Industrial Application Field) The present invention relates to a suction port body of a vacuum cleaner used for removing floors, etc. Regarding the brush body that extrudes.

(Prior art) In the floor suction port body of a conventional vacuum cleaner, a suction port is provided at the rear of the suction port body and communicates with a joint pipe that is connected to the vacuum cleaner body via a hose or an extension pipe. A structure has been adopted in which a suction groove is opened at the center of the bottom surface of the suction port body, and a suction groove extending from the suction port to both left and right sides is formed at the middle portion of the bottom surface of the suction port body in the longitudinal direction. but,
In this conventional structure, the part of the suction port body located in front of the suction groove located on the extension of the joint pipe does not form an air passage for removing waste, so when cleaning the corner of a room, the suction port body Even when I placed the front of the machine against a wall, it was not able to sufficiently absorb dust from the corners, especially on carpets.

In addition, conventional vacuum cleaners have been equipped with a rotating brush that is driven by an air turbine or an air turbine with the left and right directions as rotational axis directions, facing the suction port that is located on the front side of the bottom of the main body of the suction port, to scrape out dust from carpets, etc. A suction port body is also known.

However, with a rotating brush, the trajectory of the tip of the bristles is a circle, so even if the front of the suction port body is placed against a wall, at least within the radius of the circle, it will not reach the corner of the room. In I! ! I can't scrape out the dust.

Furthermore, conventional electric h
1. The suction port of the remover can suck up dust even in the corners of the room.
In addition to the suction port on the bottom, there is an auxiliary suction port that is opened by an integrated shutter at the bottom of the front of the suction port body.
A similar structure was also adopted. However, with this conventional structure, when cleaning corners, there is a suction port on the bottom in addition to the open auxiliary suction port, so the amount of suction at the auxiliary suction port is small, and the dust in the corners cannot be sufficiently removed. I couldn't absorb it. In addition, since a rotating brush is used to scrape out the dust, there is no improvement in the fact that the dust cannot be scraped directly from the corners of a carpeted room.

(Problems to be Solved by the Invention) As mentioned above, the suction port of conventional vacuum cleaners uses a rotating brush to scrape out dust from carpets, etc., resulting in the problem that dust cannot be scraped out efficiently in the corners of the room. was there.

The present invention aims to solve these problems, and by reciprocating the brush body by rotation,
An object of the present invention is to provide a suction port having an electric power of A'tl Wf < 111, which can sufficiently and efficiently scrape out dust even in the corners of a room, and can clean even the corners of a room. It is.

Further, it is an object of the present invention to enable the suction port body of this vacuum cleaner to stop the brush body if it is not necessary. Another purpose is to be able to scrape out and suck in dust even more efficiently.

Furthermore, it is an object of the present invention to enable more efficient cleaning by making it possible to adjust the reciprocating mode of the brush body depending on the type of surface to be removed.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the suction port body of the vacuum cleaner of the present invention has the suction port on the front side of the bottom and communicates the suction port with the main body of the vacuum cleaner. A suction port body provided with a communication portion such as a joint pipe, and flexible brush bristles on the bottom surface of the suction port body, which are supported so as to be able to reciprocate from side to side, back and forth, or up and down, facing the suction port. The brush body is provided with a protruding brush body, and a driving means such as an air turbine or an electric motor, which is provided within the suction port body and drives the brush body to reciprocate.

Note that stopping means such as an externally operable switch or a brake device may be added to stop the driving of the brush body by the driving means.

Further, the bristles of the brush body are arranged in an inclined manner in a direction toward the rear toward the middle heat section in the left and right direction of the brush body, and a bristleless part without brush bristles is provided in the center of the brush body. A communicating portion to the cleaner body may be provided at a position facing the hairless portion from the rear.

Furthermore, an externally operable variable means for changing the amplitude or frequency of the reciprocating motion of the brush body may be added.

(Function) In the suction port body of the vacuum cleaner of the present invention, the brush body facing the suction port is driven by the drive means in the main body to reciprocate or vibrate, for example in the left and right direction, and this reciprocating brush Flexible brush bristles protruding from the bottom of the body scrape out dust from surfaces to be cleaned, such as carpets. fj was scraped out like this! Dust is sucked in through the suction port and guided to the vacuum cleaner body via the communication part. At that time, if you place the front side of the suction port body against the wall, the suction port with the brush body will be on the bottom front side of the suction port body, and
Since the brush body reciprocates in the left and right directions, its bristles can reach up to the wall on the surface to be removed, and dust can be scraped out even in the corners of the room. In other words, dust is scraped out and sucked in even in the corners of the room.

Further, in the suction port body of the vacuum cleaner according to claim 2, when there is no need to drive the brush body when cleaning a wooden floor, the stopping means is operated from the outside and the driving of the brush body is stopped by the stopping means. make it stop. If necessary again, the stop means is operated to drive the brush body.

In addition, in the suction port body of the vacuum cleaner according to claim 3, the brush bristles are arranged in an inclined manner in a direction toward the rear toward the center portion of the brush body in the left-right direction, so that the brush body can be photographed or the suction air can be drawn in. As a result, dust on the lower front side of the suction port body is guided by the brush bristles and collects in the center of the brush body. Then,
This central part is a glabrous part with no brush bristles, so
The dust collected here is not obstructed by the brush bristles, and is sucked into the communication part facing the bristleless part from the rear.

Furthermore, in the suction port body of the vacuum cleaner according to claim 4, the amplitude of the reciprocating motion of the brush body can be adjusted by operating the variable means from the outside depending on the type of surface to be cleaned or the purpose of use. 1.1 Change the vibration frequency etc.

(Example) Hereinafter, the structure of an example of the suction port body of a vacuum cleaner of the present invention will be described based on FIGS. 1 to 6.

In FIGS. 1 and 3, reference numeral 11 denotes a suction port main body whose planar shape is horizontally long and approximately rectangular. It consists of And the suction port main body 11
Inside, there is a front and rear partition wall 14 extending in the left and right direction.
A brush chamber 15 is formed on the front side, and by left and right partition walls 16 and 17 extending rearward from the partition wall 14, the turbine chamber 18 is located at the rear central portion, and the converting means chamber 19 is located at the center of the rear side of the turbine chamber 18 in the left and right direction. - each formed laterally;

Further, an elongated suction port 21 extending in the left-right direction is formed in the bottom surface of the lower case 12 facing the brush chamber 15 . Further, a communication port 22 is formed in the front and rear partition walls 14 facing the turbine chamber 18 . moreover,
A joint pipe 23 is provided protruding from the rear surface of the suction port main body 11 at 6/υ in the turbine chamber 18 and is detachably fitted and connected to a hose or an extension pipe connected to the vacuum cleaner main body. The interior of the communication port 22, the turbine chamber 18, and the joint pipe 23 form a communication portion 24 that communicates the suction port 21 with the cleaner body.

Further, a pair of front and rear guide rods 30 are installed between the left and right sides of the brush chamber 15 . And these guide rods 3
0 is slidably passed through the plate-shaped brush stand 32 of the brush body 31 in the left-right direction, and the brush body 31 is supported in the brush chamber 15 by a reciprocating opening n in the left-right direction. Further, a spring receiver formed protrudingly on the right side of the brush chamber 15 in FIG.
The spring receiver formed protrudingly on the right pant part of the upper surface is the rib 3.
A spring 35 is attached between the brush body 4 and the brush body 31, and the brush body 31 is always biased to the left by this spring 35. Further, at the left end of the upper surface of the brush stand 32, a rib 36 of the transmission rod holder is formed to protrude, and a transmission rod guide protrusion 37 is formed to protrude from the holder to the left of the rib 3G. ing.

Furthermore, a plurality of flexible brush bristles 38 are planted on the bottom surface of the brush stand 32, which is elongated in the left-right direction. These brush bristles 38 are arranged in a plurality of strips, and each strip is inclined toward the rear toward the center of the brush stand 32 in the left-right direction. In other words, the brush stand 3
The respective strips on both the left and right sides of 2 are inclined in opposite directions so as to face each other. Note that each of the brush bristles 38 protrudes downward from the suction port 21. Furthermore, the central part of the bottom surface of the brush stand 32 is a bristleless area 39 in which the brush bristles 38 are not set in a certain range;
The communication port 22 faces from the rear. Note that each brush bristles 38 may also serve as a linear member;
It may also consist of one elastic protrusion.

Further, an air turbine 41 serving as a driving means for driving the brush body 31 as shown in FIG. 3 is rotatably supported in the turbine chamber 18 so as to face the communication port 22 from the rear. A rotating shaft 42 of the air turbine 41 whose axial direction extends in the left-right direction projects into the converting means chamber 19 .

Also, in this conversion means chamber 19, the air turbine 4
A converting means 46 consisting of a crank that converts one rotation into reciprocating motion and transmits the same to the brush body 31 is provided. As this conversion means 46, the rotation @42 of the air turbine 41
A seven flange portion 47 inclined at a certain angle with respect to the axial direction is provided at the tip of the flange portion 4.
A groove portion 48 having a circular shape when viewed from the axial direction and centered on the rotating shaft 42 is formed on the end surface of the rotary shaft 7 . The tip of a flexible transmission rod 49 is slidably engaged with the groove 48 in a fixed position. The transmission rod 49 is introduced into the brush chamber 15 by penetrating the front and rear partition walls 14 in a slidable manner, and the transmission rod holder of the brush body 31 is connected to the rib 36 at the tip end inside the brush rls.
is fixedly engaged with. Further, the transmission rod 49 is
a transmission rod guide protrusion 50 formed within the converting means chamber 19;
The hook is slidably connected to the transmission rod guide protrusion 37 of the brush body 31 and is maintained bent in a U-shape, and a restriction formed at the periphery within the converting means chamber 19 is provided. The position is also regulated by the ribs 51.

The converting means chamber 19 also includes the air turbine 41.
A stopping means 5G, which is a brake, is provided to appropriately control JlJ11. This stopping means 56 is connected to the converting means chamber 19
It consists of a stop piece 59 that is slidably supported after 1it between a pair of support ribs 57 and 58 formed inside, and a front end of this stop piece 59 is provided with a stop piece 59 that can freely move toward and away from the rotation @42 of the air turbine 41. A stopping rubber 60 is fixedly attached to the stopper. Further, a protrusion 61 is formed on the side surface of the stop piece 59, and an elastic locking fitting 62 is provided on one of the support ribs 57 to which the protrusion 61 is engaged and disengaged to hold the stop piece 59 in place. is fixed. Furthermore, as shown in FIG. 5, an operating knob 63 is formed on the upper side of the stop piece 59, and this operating knob 63 projects upwardly and outwardly from the upper case.

Further, near the communication port 22 of the suction port main body 11,
A frequency variable means 66 for changing the frequency of the reciprocating motion of the brush body 31 is provided. This frequency variable means 6
6 is slidably supported between the front and rear partition walls 14 and a support rib 67 formed at the rear thereof, and is connected to the communication rod 220.
It consists of an opening/closing piece 68 that changes the interspace area. A protrusion 69 is formed on the front surface of this opening/closing piece 68. On the other hand, an elastic locking metal fitting 70 is fixed to the front and rear partition wall 14 to hold the opening/closing piece 68 in a fixed position when the protrusion 69 is engaged and disengaged. A stopper rib 71 is formed at which the protrusion 69 comes into contact. Roughly, as shown in Fig. 16, an operation knob 72 is formed on the upper side of the closing piece 68.
It protrudes upward and outward from the base.

Next, the operation of the above embodiment will be explained.

At the time of shaking, the joint pipe 23 is connected to a hose or an extension pipe connected to the main body of the vacuum cleaner. By driving the electric blower inside the vacuum cleaner body, the dust sucked in with the air from the suction port 21 is also removed through the brush chamber 15, communication port 22, turbine chamber 18, joint pipe 23, extension pipe, and hose. The dust is guided to the main body of the vacuum cleaner and captured in the dust collection chamber of the main body of the vacuum cleaner.

Here, as shown in FIG.
If the rotation is away from the rotation @42 of the air turbine 41, the air turbine 41 will be rotated by the suction wind that has flowed into the turbine 18 from the communication port 22. Accordingly, the tip of the transmission rod 49 is slidably engaged in the groove 48 of the inclined flange 47 of the rotating shaft 42 of the air turbine 41 at a fixed position, and the transmission rod 49 is held by the spring 35. Since the transmission rod 49 is biased toward the air turbine 41 via the brush body 31, the transmission rod 49 reciprocates. In other words, the rotation is converted into t1 backward movement.

The brush body 31 reciprocates or vibrates in the left and right direction together with the transmission rod 49, and this reciprocating brush body 3
Brush bristles 38 on the bottom of 1 scrape out dust from surfaces to be cleaned such as carpets.

At this time, since the suction port 21 is located on the front side of the bottom of the suction port main body 11 and the brush body 31 does not rotate but moves from side to side, the brush bristles 38 scratch the carpet etc. even at a lower position on the front surface of the suction port main body 11. . Therefore, if the front surface of the suction port body 11 is placed against the wall of the room, for example,
The brush bristles 38 that reach the wall on the surface to be abrased scrape out dust even in the corners of the room. Moreover, the brush body 31
is long and narrow along the longitudinal direction of the suction port main body 11, which is long in the left-right direction, so that dust is efficiently scraped out at the corners.

Further, since the suction port 21 is opened only on the front side of the bottom of the suction port body 11 and not on the front side of the suction port body 11, dust is strongly sucked in even in the corners of the room.

In this way, even in the corners of the room, near furniture, etc., dust is scraped out and sucked in, making it possible to clean thoroughly.

Further, since the brush bristles 38 are arranged in an inclined manner in a direction toward the rear toward the center of the brush body 31 in the left-right direction, the vibration of the brush body 31 or the suction air causes the brush bristles 38 to move toward the lower front side of the suction port body 11. The dust is guided by the brush bristles 38 and gathers in the center of the brush body 31. Since this center part is a bristleless part 39 without the brush bristles 38, the dust collected here is not obstructed by the brush bristle 38, and the dust is transferred to the communication port 39 facing the bristle part 39 from behind.
It is smoothly sucked into 2. In this way, dust is scraped out and sucked in even more efficiently.

On the other hand, when there is no need to drive the brush body 31 for cleaning a main floor etc., as shown in FIG.
is operated to move the stop piece 59 forward, and the stop rubber 60 of the stop piece 59 is pressed against the rotating shaft 42 of the air turbine 41. Note that in this state, the protrusion 61 of the stop piece 59 that has climbed over the elastic locking metal fitting 62 due to the forward movement is attached to the locking metal fitting 62.
It is held by being engaged with the front side of the In this state, the rotation 1N142 of the air turbine 41 is restricted by the stop piece 59, so even if the intake air from the communication port 22 blows into the air turbine 41, the air turbine 41 will not rotate. , so the brush weight is also not driven.

Also, the stop piece 59 is moved backward, and the stop rubber 60 is moved from the rotating shaft 42 to Mt! For example, the brush body 31 becomes drivable again. At this time, the protrusion 61 of the stop piece 59 passes over the elastic locking fitting 62 and is engaged with the rear side.

By the way, as shown by the solid line in FIG. 1, when the protrusion 69 of the opening/closing piece 68 is engaged with the right side of the locking fitting 10 in the figure, the entire communication port 22 is opened. Therefore, the flow velocity of the suction air flowing into the turbine chamber 18 from the communication port 22 becomes slower, so the rotational speed of the air turbine 41 becomes smaller, and the frequency of the reciprocating motion of the brush body 31 interlocked with the air turbine 41 becomes lower. becomes smaller. On the other hand, as shown by the chain line in FIG. 1, when the operating knob 72 is operated to move the opening/closing piece 68 to the left, this opening/closing piece 68 closes a part of the communication port 22, and this communication port The opening area of 22 becomes smaller. Therefore, the flow velocity of the suction air flowing in from the communication port 22 increases, so the rotational speed of the air turbine 41 increases, and the vibration frequency of the brush body 31 increases. Incidentally, as the opening/closing piece 68 is moved left and right, its protrusion 69 is engaged with and disengaged from the elastic locking fitting 70. Further, since the protrusion 69 comes into contact with the stopper rib 11 from the right side, the opening/closing piece 68 is prevented from being manipulated, and the opening area of the communication port 22 is prevented from becoming smaller than necessary.

In this way, the frequency of the reciprocating motion of the brush body 31 can be selected depending on the type of surface to be cleaned or the purpose of use, so cleaning can be performed more efficiently.

Next, another embodiment of the present invention will be described based on FIGS. 7 to 9.

In this embodiment, an air turbine 4 is provided in the converting means chamber 19.
A conversion means 46 that converts one rotation into a reciprocating motion, and an amplitude variable means 7G that changes the amplitude of the reciprocating motion of the brush body 31 are provided. As the conversion means 46, a first transmission rod 78 having rigidity is supported by the support member 11 fixed in the conversion means chamber 19 so as to be able to move only from side to side. It is fixedly and slidably engaged with the vortex part 48 of the inclined 7-lunge part 47 of the rotation @1142 of the air turbine 41 similar to the actual sub-example. Further, a spring 80 is installed between the other end of the first transmission rod 78 and the rib 19 of the spring receiver formed on the side surface of the converting means chamber 19.
Therefore, the first transmission rod 78 is always urged toward the air turbine 41.

Further, as the amplitude variable means 76, left and right guide ribs 81 and 82 formed on the bottom surface inside the conversion means chamber 19 are used.
A frame-shaped support piece 83 is supported in between so as to be movable back and forth. Note that an operating knob 84 is formed on the upper side of this support piece 83, and this operating knob 84 projects upwardly and outwardly from the upper case. Then, the frame-shaped support piece 8
A second transmission rod 85 is inserted through 3 and supported so as to be swingable from side to side. At the rear end of the second transmission rod 85, a pair of left and right transmission rod holders formed on the curved surface of the first transmission rod 78 are swingably engaged between ribs 86. Further, the front part of the second transmission rod 85 is inserted into a cylindrical part 87 formed in the apron partition wall 14 so as to be movable left and right, and the front end part is attached to the upper surface of the brush stand 32 of the brush body 31. A substantially mouth-shaped transmission rod holder formed in is pivotally engaged with the rib 88.

Then, during cleaning, as the air turbine 41 rotates, the first transmission rod 78 reciprocates in the left and right direction e'? r'
Ru. Accordingly, the second transmission rod 85 swings in the left-right direction about the support piece 83, and the brush body 31 reciprocates in the left-right direction together with the front end of the second transmission rod 85.

When the operation knob 84 is operated to move the support piece 83 forward or backward, the movement from the support piece 83, which is the fixed fulcrum of the swing of the second transmission rod 85, to the rear end of the second transmission rod 85 is Since the ratio between the distance and the distance to the front end of the second transmission bar 85 changes, the stroke of the reciprocating movement of the brush body 31 relative to the reciprocating stroke of the first transmission rod 78 changes. That is, the amplitude of the reciprocating motion of the brush body 31 changes. 4^Oh, the further back the support piece 83 is positioned, the more
The amplitude of the reciprocating motion of the brush body 31 increases.

In this way, the brush body 31 is
Since the amplitude of the reciprocating motion can be adjusted, cleaning can be done more efficiently.

In the above embodiment, the driving means for driving the brush body 31 is the air turbine 41, but the driving means may be an electric motor or the like.

Further, in the above embodiment, the rotation is converted into reciprocating motion and the driving force is transmitted from the driving means to the brush body 31. However, it is possible to use a linear actuator as the driving means and directly connect it to the brush body 31. Good too.

Further, when the driving means is an electric motor, the brush body 31
The stopping means for stopping the driving may be an electric switch. In addition, the electric motor is driven on the front surface of the suction port main body 11,
A normally open switch is provided to stop the cleaning, and when cleaning a corner of the room, when the switch hits the wall, the 'Fi
@p may be started automatically.

Further, in the above embodiment, the stopping means may be one that brakes the transmission Y rod 49 or the brush body 31.

In addition, as a stopping means in the case of the air turbine 41, in addition to a brake, a clutch that releases the transmission of the driving force from the air turbine 41 to the brush body 31, etc. can be used.

Furthermore, in the above embodiment, the brush body 31 is reciprocated in the left-right direction, but
” You may do so.

〔Effect of the invention〕

According to the present invention, the following effects can be achieved by 1!7.

In the suction port body of the vacuum cleaner according to claim 1, the brush body is provided facing the suction port opened at the bottom front side of the suction port body and is reciprocated by the driving means, so that the curved surface of the suction port body is Even in the lower position, the bristles on the bottom of the brush body can scrape out dust from surfaces to be cleaned such as carpets. Dust can be thoroughly and efficiently removed from the corners of the room without leaving any dust behind.

In addition, in the suction port body of the electric Wn dirt remover according to claim 2, since an operable stop means for stopping the driving of the brush body is provided, the brush body can be stopped if not necessary, and the brush body can be stopped when the brush body is stopped. Efficient cleaning can be done depending on the type.

In addition, in the suction port body of the electric remover (h) of claim 3, the brush bristles are arranged in an inclined manner in a direction toward the rear toward the center of the brush body in the left-right direction, and the brush bristles are arranged in an inclined manner in the direction of approaching the center of the brush body in the left-right direction. A bristle part is provided, and a communication part to the main body of the remover is provided at a position facing this bristle part from the rear, so that the dust is guided to the brush bristles by the reciprocating movement of the brush body or the suction air, and the bristle is removed. Since the dust flows east toward the opening and is smoothly sucked into the communication section from there, dust can be scraped out and sucked in even more efficiently.

Furthermore, the suction port body of the vacuum cleaner according to claim 4 is provided with an operable variable means for changing the form such as the amplitude and frequency of the reciprocating movement of the brush body, so that the form of the reciprocating movement can be freely adjusted. More efficient cleaning can be performed depending on the situation of the surface to be cleaned.

[Brief explanation of the drawing]

FIG. 1 is a planar cross-sectional view showing an embodiment of the suction port body of a vacuum cleaner according to the present invention, FIG. 2 is a planar cross-sectional view of the vicinity of the air turbine braked by the same stopping means, and FIG. 3 is the same as the above. An overall bottom view, FIG. 4 is a perspective view of the air turbine, FIG. 5 is a perspective view of the stop piece of the stop means, FIG. 6 is a perspective view of the opening/closing piece of the swing number variable means, and FIG. FIG. 8 is a perspective view of the amplitude variable means portion of the vacuum cleaner according to another embodiment of the present invention, and FIG. 9 is a perspective view of the entire vacuum cleaner according to the present invention. 11. Suction port body, 21. Suction port, 24. Communication portion, 31. Brush body, 38. Brush bristles, 39. Hairless portion, 41. Air turbine as driving means, 56.・
Stopping means, 6G...frequency variable means, 76...amplitude variable means. Invented on November 25, 1986 Akira Nakanishi Masa Do Senda! li! Akira

Claims (4)

[Claims] (1) A suction port body that has a suction port opened on the front side of the bottom and is provided with a communication part that communicates the suction port with the vacuum cleaner body; and a suction port body that faces the suction port and is supported for reciprocating movement. A vacuum cleaner comprising: a brush body having flexible brush bristles protruding from the bottom; and a driving means provided in the suction port body for driving the brush body to reciprocate. suction port body. (2) The suction port body for a vacuum cleaner according to claim 1, further comprising an externally operable stopping means for stopping the driving of the brush body by the driving means. (3) The bristles of the brush body are arranged in an inclined manner in a direction that faces backward and approaches the center of the brush body in the left-right direction, and a bristle-free portion without bristles is provided in the center of the brush body. 3. The suction port body for a vacuum cleaner according to claim 1, further comprising: a communicating portion to the vacuum cleaner main body at a position facing the hairless portion from the rear. (4) The suction port body for a vacuum cleaner according to any one of claims 1 to 3, further comprising an externally operable variable means for changing the form of reciprocating motion of the brush body.