KR100500841B1 - Inhalation unit of vacuum cleaner - Google Patents

Abstract

The present invention relates to a suction unit of a vacuum cleaner, comprising: a suction body detachable to a suction tube of a vacuum cleaner having a dust suction hole; And an auxiliary suction body elastically coupled with respect to the suction body and variably corresponding to a corner portion having a predetermined angle to be cleaned, and an auxiliary suction hole communicating with the dust suction hole along the stretching direction. According to this, the suction area can be appropriately increased or decreased to quickly and easily clean the corners of the room, and in particular, foreign substances to be sucked are not caught or stuck to the suction part.

Description

Suction unit of vacuum cleaner {INHALATION UNIT OF VACUUM CLEANER}

The present invention relates to a vacuum cleaner, and more particularly, to a suction unit detachably coupled to a suction tube of a vacuum cleaner for sucking external dust.

The vacuum cleaner is difficult to clean the dust and dirt remaining in the suction part, for example, in the corner of the room. Recently, a foldable vacuum cleaner brush has been proposed that can solve this problem.

1 to 4 illustrate a folding vacuum cleaner brush disclosed in Korean Patent Laid-Open Publication No. 2003-0005545. Referring to these drawings, the conventional foldable vacuum cleaner brush, the center body (1) connected to the suction tube (see 105 in Fig. 5) of the vacuum cleaner, and the left side rotatably installed on both sides of the central body (1) It consists of the right body (2, 2 '). A spring 3 is interposed between the central body 1 and the left and right bodies 2 and 2 'to return the left and right bodies 2 and 2' to their original positions.

As can be seen in more detail in Figure 3, the central body (1) has a suction opening 11 is opened downward through which the dust and dirt (hereinafter referred to as foreign matter) of the outside is sucked. Guide grooves 12 for guiding rotation of the left and right bodies 2 and 2 'are formed at both outer peripheries of the central body 1, respectively. In addition, a spring guide hole 13 is formed in an upper portion of the guide groove 12, and a spring 3 connected to the left and right bodies 2 and 2 ′ is mounted in the spring guide hole 13.

On the bottom of the central body 1, first, second and third protrusions 14, 14 'and 14' 'are formed. Among these protrusions 14, 14 ', 14 ", the second and third protrusions 14'. 14" have one side side in parallel with the suction grooves 21, 21 '. The first protrusion 14 is formed at the lower center of the second protrusion 14 ′ and the third protrusion 14 ″. On the bottom of the central body 1, a pair of left and right barrier film guide grooves 17, 17 'are formed on the outer side of these protrusions along the circumferential direction.

The left and right bodies 2 and 2 ', on the other hand, have protruding guides 22 and 22' coupled to the guide groove 12. Spring connection grooves 24 and 24 'are provided at the top of the protruding guides 22 and 22', and suction grooves 21 and 21 'are formed at the center of the bottom surface. The suction grooves 21 and 21 'guide the foreign matter to the suction port 11 of the central body 1. Then, blocking films 23 and 23 'are provided at the lower ends of the protruding guides 22 and 22' to prevent the suction force from being lost at the connection portion with the central body 1.

The barrier film guides 25 and 25 'are formed on the upper surfaces of the barrier films 23 and 23'. The barrier film guides 25 and 25 '' are coupled to the barrier film guide grooves 17 and 17 'formed on the bottom of the central body 1. Here, the barrier film guide grooves 17 and 17 'have different radii with respect to the central axis of the central body. As a result, the blocking films 23 and 23 'of the left and right bodies 2 and 2' can be smoothly rotated without being in contact with each other.

On the other hand, the spring 3 is composed of two torsion springs (Torsion spring). Each spring 3 has one side fixed to the central body 1 and the other side fitted to the spring connection grooves 24 and 24 'of the left and right bodies 2 and 2', respectively. This spring 3 provides restoring force when the left and right bodies 2, 2 'are rotated by furniture or walls, for example, indoors to be cleaned.

Such a conventional foldable vacuum cleaner brush can be coupled to the suction tube of the vacuum cleaner using a connector (not shown) suitable for the shape of the central body 1. Then, using the folding brush coupled to the vacuum cleaner, for example, when cleaning the corners of the room, that is, the 90 ° angled corners, to advance the brush as shown in FIG. Then, the left and right bodies 2, 2 'are rotated back around the center body 1 by the force applied from the outside. As a result, the suction port 11 of the central body 1 is close to the corner portion between the bottom 51 and the wall 55, at which time, foreign substances are sucked in the direction of the arrow. On the other hand, when the brush is retracted after cleaning the corresponding part, the force applied to the left and right bodies 2 and 2 'is removed. As a result, the left and right bodies 2 and 2 'are returned to their original state by the restoring force provided by the spring 3.

By the way, in the conventional foldable vacuum cleaner brush, there is an advantage that can be cleaned in the corners of the room, but because the length of the left and right body is limited, only a relatively narrow area can be cleaned. Therefore, there is an inconvenience in that the brush must be repeatedly moved and cleaned several times. In the conventional foldable vacuum cleaner brush, in addition, due to the configuration in which the spring is exposed to the suction port for inhaling the foreign matter, the foreign matter to be sucked into the spring causes malfunction. In addition, maintenance for removing the foreign matter which gradually increases around the spring and its surroundings is difficult.

Accordingly, an object of the present invention is to allow for easy and quick cleaning of the suction area according to the angles or areas of the corners of the room to be cleaned, for example, in view of these problems in the related art. It is to provide a suction unit of the vacuum cleaner.

Another object of the present invention, the rotation of the left and right body around the center body is desired, in particular, to provide a suction unit of the vacuum cleaner that can prevent the problems that can occur as possible by pinching or stuck inside the foreign matter as possible will be.

The object is a suction body having a dust suction port detachable to the suction pipe of the vacuum cleaner; And an auxiliary suction body elastically coupled with respect to the suction body and variably corresponding to a corner portion having a predetermined angle to be cleaned, and an auxiliary suction hole communicating with the dust suction hole along a stretch direction. By the suction unit of the configured vacuum cleaner.

Here, the auxiliary suction body, a pair of left and right rotating brushes rotatably coupled to the dust suction port of the suction body; And a stretchable brush which can be pulled out and retracted along the longitudinal direction of the respective rotating brushes. The auxiliary suction openings may be formed along the longitudinal direction of the pivot brush and the bottom surface of the expansion brush, respectively.

The suction body may include: a central body having a hinge rib through which the dust suction port is downwardly opened and having a dust discharge hole toward the suction pipe, extending downward from the dust suction hole to rotatably couple the pair of rotation brushes to the left and right; And a main body casing to which the central body and the suction pipe are mounted and rotatably support the pair of rotating brushes. Here, the first connecting pipe coupled to the suction pipe; And a second connecting pipe coupled to the main body casing so as to be relatively rotatable with the first connecting pipe.

The main body casing includes: a central portion provided with an air flow path between a body mounting portion on which the central body is mounted and a pipe coupling portion communicating with the suction pipe; And a pair of wings extending from the central portion to both sides, the pair of wings each having an inner portion for guiding the rotation of the rotating brush.

At this time, the inner portion during the rotation, guide grooves are provided in an arc shape on each side of the wing portion around the hinge rib of the central body; And a guide protrusion protruding from the pivoting brush to be accommodated in the guide groove. It is preferable to further include an elastic member for returning the rotation of each said rotational brush to an original position.

Each of the rotation brushes, the hinge portion rotatably coupled to the hinge ribs of the central body; And a rotation body accommodating the retractable brush retractably and pivoting the hinge portion to the shaft, wherein the auxiliary suction port protrudes from the bottom surface. The hinge cover may further include a hinge cover coupled to a hinge rib of the central body to which the pair of rotation brushes are coupled. In this case, the hinge rib, the hinge cover, the hinge part, and the rotation body may include: Each of the auxiliary suction port and the dust suction port is preferably provided along the outer periphery of the air passage hole for mutual communication.

The expansion brush, the main body is retractably accommodated in the rotation brush, the main body is formed in the auxiliary suction port on the bottom surface; And a position fixing part for fixing the withdrawal withdrawal position of the expansion body with respect to the rotating brush.

The suction unit of the vacuum cleaner, the leaf spring is provided on any one side of the contact surface of the expansion brush and the rotating brush; And a plurality of locking jaws provided along the lengthwise direction on the other side and held by the leaf springs, to fix the withdrawal and withdrawal position of the stretchable brush with respect to the rotating brush.

And, a guide guide formed along the withdrawal retraction direction on any one side of the mutual contact surface of the rotating brush and the expansion brush; And a moving protrusion protruding on the other side and movable along the guide guide, to smoothly withdraw the extension brush.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. In this case, the same reference numerals are assigned to the same configurations and names as those of FIGS. 1 to 5 described above with reference to the related art.

5 is a perspective view of a vacuum cleaner having a suction unit according to the present invention. As can be seen in the drawing, the vacuum cleaner 100 includes a cleaning main body 101 having a vacuum generator (not shown), a suction pipe assembly 102 coupled to the cleaning main body 101, and a suction pipe assembly 102. It is composed of a suction unit 110 according to the present invention coupled to the suction suction of foreign matter. The suction tube assembly 110 includes a flexible tube 104 coupled to the intake port 106 of the cleaning base 101, a suction tube 105 coupled to the rear of the suction unit 110, and these flexible tubes 104. The handle tube 103 is interposed between the suction pipes 105.

6 is a perspective view of the suction unit according to the present invention as the main portion enlarged view of FIG. 5, FIG. 7 is an exploded perspective view of FIG. 6, and FIG. 8 is a bottom perspective view of the front side of FIG. 7. As can be seen in these figures, the suction unit 110, the suction body 101 is coupled to the suction pipe 105 of the vacuum cleaner 100, and can be rotated and stretched with respect to the suction body 101 It is composed as large as possible secondary suction body (150). Suction body 101 is coupled to the suction pipe 105 via the first connecting pipe 116 and the second connecting pipe 117, these first and second connecting pipes (116, 117) to allow relative rotation Are interconnected.

The suction main body 101 includes a main body casing 121 forming an outer appearance and a central body 141 embedded in the main body casing 121. 9 and 10, the central body 141 may include a hinge rib 143 forming a rotation shaft of the auxiliary suction body 150, and a dust outlet 142 opened toward the rear side. Has The hinge rib 143 is provided with a dust suction opening 146 which is downwardly opened, and an air passage hole 145 is cut along the outer circumference thereof.

The main body casing 121 is composed of a lower case 123 and an upper cover 122. The lower case 123 includes a central portion 131 on which the central body 141 is mounted, and a pair of wings 124 and 124 'extending to both sides of the central portion 131. The central portion 131 and both wing portions 124 and 124 'are partitioned by the partitions 130 and 130', and the central portion 131 partitioned by the central portion 131 is provided with an air flow path 134 along its front and rear directions. And, the front end of the air passage 134 is formed with a body mounting portion 132 is mounted to the central body 141, the rear end is formed with a pipe coupling portion 133, the second connecting pipe 117 is coupled. As a result, foreign substances discharged to the dust outlet 142 of the central body 141 flow along the air flow path 134 and then flow into the suction pipe 105 through the second connection pipe 117.

On both side wings 124 and 124 'of the lower case 123, inclined surfaces 126 and 126' which form a constant inclination angle toward the rear are formed, respectively. Guide grooves 125 and 125 'are formed in the central region of the bottom surface of the wing portions 124 and 124' to form an arc shape around the hinge rib 143 of the central body 141. The guide grooves 125 and 125 'accommodate guide protrusions 166 and 166' protruding upward from the rotation brushes 161 and 161 'of the auxiliary suction body 150 which will be described later in detail. The guide protrusions 166 and 166 'guide the rotation of each of the rotation brushes 161 and 161' while moving along the longitudinal direction of the guide grooves 125 and 125 '. At this time, the inclined surfaces 126 and 126 'contact the wall or furniture, for example, which rotates the rotation brushes 161 and 161', whereby excessive rotation of the rotation brushes 161 and 161 'is limited. do.

Spring projections 127 and 127 'protrude upward from the bottom surfaces 124 and 124' of the lower case 123, respectively. Here, the spring protrusions 127 and 127 'are preferably provided between the guide grooves 125 and 125' and the hinge ribs 143. The torsion springs 135 and 135 'are coupled to the spring protrusions 127 and 127', one end of the torsion springs 135 and 135 'is fixed to the wing portions 124 and 124', and the other end is the rotation brush 161. , 161 ') and is fixed to the guide protrusions 166 and 166' protruding from each other. As a result, the rotating brushes 161 and 161 'rotatably supported by the wing portions 124 and 124' are returned to their original positions as described later by the elastic force of the torsion springs 135 and 135 '.

FIG. 11 is a partial cutaway enlarged perspective view illustrating a coupling state of the auxiliary suction body of FIG. 7, FIG. 12 is a cross-sectional view taken along a line A-A of FIG. 11, and FIG. 13 is a cross-sectional view taken along a line B-B of FIG. 11. The auxiliary suction body 150 includes a pair of rotating brushes 161 and 161 'and also a pair of expansion and contracting brushes 171 and 171' which are accommodated in each of the rotating brushes 161 and 161 '. . In the figure, only the rotational brush 161 and the expansion brush 171 of one side are shown, and these will be mainly described below.

Each of the rotation brushes 161 and 161 'includes a hinge portion 163 coupled to the hinge rib 143 of the central body 141 and a rotation body 162 extending radially from the hinge portion 163. It consists of. The rotation body 162 has a rectangular cylinder shape, and the opposite end portion of the hinge portion 163 is formed by the opening 167. An auxiliary suction port 168 protruding upward is provided on the bottom surface of the rotation body 162. The auxiliary suction opening 168 extends along the longitudinal direction of the rotation body 162, and one end communicates with the dust suction opening 146 of the central body 141. Guide protrusions (166 of FIG. 7) protrude upwards on the upper surfaces of the pivot bodies 162 and are coupled to the guide grooves 125 formed on the wing portions 124 of the main body casing 121.

On the other hand, the hinge portion 163 has a ring shape and is rotatably coupled to an outer surface of the hinge rib 143 formed on the central body 141. The hinge portion 163 has a thickness of about 1/2 size with respect to the vertical length of the rotating body 162 is provided on one end of the rotating body 162. Then, the hinge portion 163 'of the other rotating brush 161' is provided at one lower portion of the rotating body 162 '. As a result, the hinge parts 163 and 163 'are coupled to overlap each other on the outer surface of the hinge rib 143, as shown in FIG.

On the other hand, in the hinge portion 163 'of the rotating brush 161' disposed below, a dust passing hole 165 is formed along the circumferential direction thereof. The dust passing hole 165 serves to communicate the auxiliary suction hole 168 of the other rotating brush 161 and the dust suction hole 146 of the central body 141 with each other.

And, as can be seen in Figure 10, the hinge portion 163, 163 'coupled to the hinge rib 143 of the central body 141 superimposed, the hinge is coupled to the hinge rib 143 at the lower side Supported by a cover 181. The hook 182 protrudes from the upper end of the hinge cover 181, and the hook rib 143 is formed in the hook groove 144 to which the hook 182 is engaged. In addition, an air passage hole 185 is formed on the outer circumferential surface of the hinge cover 181, so that the auxiliary suction holes 168 and 168 ′ and the dust suction hole 146 can communicate with each other.

 On the other hand, the expansion brush 171 also has a rectangular shape and can be accommodated in the opening 167 of the rotation brush 161. Similarly to the rotational brush 161, the auxiliary suction port 178 is formed in the bottom surface of the expansion brush 171 along the longitudinal direction. Here, the auxiliary suction opening 178 of the rotating brush 161 is bittenly coupled with the auxiliary suction opening 178 of the expansion brush 171, whereby the expansion brush 171 slides out along the longitudinal direction of the rotation brush 161. Retractable The auxiliary suction opening 178 of the expansion brush 171 communicates directly with the dust suction opening 146 of the central body 141 in the retracted state, and in the withdrawn state through the auxiliary suction opening 168 of the rotation brush 161. Communicate with the dust intake 146.

An outer end of the expansion brush 171 has a locking rib 177 protruding outward. The locking rib 177 is in contact with the opening edge of the rotational brush 161 during the withdrawal movement of the rotational brush 161 of the expansion and contraction brush 171. As a result, excessive retraction movement of the expansion and contraction brush 171 is limited.

The position fixing of the rotating brush 161 of the expansion brush 171 is made by a leaf spring 191 and a plurality of locking jaws 192 which can be seen in more detail in FIG. The leaf spring 191 is fixed to the spring groove 193 recessed in the outer surface of the expansion brush 171. The plurality of locking jaws 192 protrude inwardly along the longitudinal direction of the rotation brush 161. The leaf spring 191 is engaged with the catching jaws 192 of the rotating brush 161 when the extension brush 171 is withdrawn. Here, the leaf spring 191 is installed in the rotation brush 161, the locking jaw 192 may be provided in the expansion brush 171.

In addition, the moving protrusion 196 protrudes from the upper surface of the expansion brush 171, and the guide guide 195 is formed along the longitudinal direction of the upper surface of the rotation brush 161. The movement protrusion 196 is accommodated in the movement guide 195 and moves along the longitudinal direction, whereby the expansion and contraction brush 171 can be smoothly withdrawn and withdrawn with respect to the rotational brush 161. Here, the moving protrusion 196 is provided on the rotating brush 161, the guide guide 195 may be formed on the expansion brush 171, of course.

In order to assemble this suction unit 110 having such a configuration, first, the central body 141 is mounted on the lower case 123 of the main body casing 121. Then, the hinge parts 163 formed on the pair of rotating brushes 161 are piled up and down, and coupled to the hinge ribs 143 of the central body 141. At this time, when the upward pressing force is provided from the lower side, the guide protrusions 166 and 166 'protruding upward from each of the rotation brushes 161 and 161' are formed on the wings 124 and 124 'of the lower case 123. It can be housed in grooves 125 and 125 '.

In this state, the hinge cover 181 is coupled to the hinge rib 143 of the central body 141. Then, each of the rotation brushes 161 and 161 'is supported by the hinge parts 181 and the wing parts 124 and 124' of the lower case 123 so as to pivot left and right about the hinge ribs 143. Then, the torsion springs 135 and 135 'are coupled to the spring protrusions 127 and 127' of the lower case 123, and both end portions thereof are rotated with the bottom surface of the lower case 123 and the rotating brushes 161 and 161, respectively. To the guide protrusions 166 and 166 'of " At this time, the elastic restoring force of the torsion springs 135 and 135 'arrange | positions the both side rotation brushes 161 and 161' correspondingly to the hinge rib 143 on the axis | shaft.

Thereafter, the expansion brushes 171 and 171 'are coupled to the rotation brushes 161 and 161'. At the same time or in a separate order, the second connecting pipe 117 is mounted to the pipe coupling part 133 of the lower case 123 to which the first connecting pipe 116 is coupled. Then, when the upper cover 122 is coupled to the upper side of the lower case 123, the assembly of the suction unit 110 is completed.

The suction unit 110 in such a coupled state may couple the first connection pipe 116 to the suction pipe 105 of the vacuum cleaner 100. Then, with the device turned on, the corner of the room can be cleaned, for example, as shown in FIG. 14. That is, when the suction unit 110 is disposed adjacent to both side walls 55 and pressed forward, both side rotation brushes 161 and 161 'rotate corresponding to both side walls 55. As shown in FIG. Here, the expansion and contraction brushes 171 and 171 'accommodated in the rotation brushes 161 and 161' can be appropriately pulled out to increase the cleaning area thereof.

On the other hand, the two-side rotating brush (161, 161 ') that rotates around the hinge rib 143 of the central body 141, when the front end of the central body 141 touches the edges of both walls (55) anymore. I never do that. Thereafter, when the pressing force toward the front is released, both of the rotating brushes 161 and 161 'are rotated to their original positions by the elastic force of the torsion spring.

As described above, according to the present invention, for example, according to the angle or the area of the corner of the room to be cleaned, the expansion and contraction of the expansion brush appropriately adjust the suction area, and then rotate the rotational brush quickly and easily A suction unit for cleaning the vacuum cleaner is provided.

The suction unit of the vacuum cleaner according to the present invention, the rotation of the left and right body around the center body is desired, in particular, because the foreign matter is sucked in the suction portion is not stuck or stuck, thereby, thereby greatly reducing the problem of equipment failure Can be reduced.

1 is a perspective view of a conventional suction unit,

2 is a bottom view of FIG. 1;

3 is an enlarged bottom perspective view of the central body of FIG. 1;

4 is a view for explaining the operation of the conventional suction unit,

5 is a perspective view of a vacuum cleaner having a suction unit according to the present invention;

Figure 6 is an enlarged view of the main part of Figure 5, a perspective view of a suction unit according to the present invention,

7 is an exploded perspective view of FIG. 6, FIG.

8 is a bottom perspective view seen from the front side of FIG.

FIG. 9 is a partially enlarged bottom perspective view of FIG. 8, which illustrates the central body, the auxiliary suction body, and the hinge cover in more detail; FIG.

10 is a perspective view of the combination of FIG.

11 is a partial cutaway enlarged perspective view illustrating a coupling state of the auxiliary suction body of FIG. 7;

12 is a cross-sectional view taken along the line A-A of FIG.

13 is a cross-sectional view taken along the line B-B of FIG. 11, and

14 is a view for explaining the operation of the suction unit of the present invention, a state in which the upper cover is removed.

<Description of the symbols for the main parts of the drawings>

100: vacuum cleaner 105: suction pipe

110: suction unit 116: first connector

117: second connector 120: suction body

121: main body casing 123: lower case

124, 124 ': wing 125, 125': guide groove

131: center portion 132: body mounting portion

133: pipe joint 141: the central body

143: hinge rib 145, 165, 185: air passage

150: auxiliary suction body 161, 161 ': rotating brush

162, 162 ': main body 163, 163': hinge part

166, 166 ': guide protrusion 168, 178': auxiliary suction port

171, 171 ': Extension brush 181: Hinge cover

191: leaf spring 192: locking jaw

195: Guide Guide 196: Moving protrusion

Claims (12)

A suction body having a dust suction port and detachable from a suction tube of the vacuum cleaner; And And an auxiliary suction body elastically coupled with respect to the suction body and variably corresponding to a corner portion having a predetermined angle to be cleaned, and an auxiliary suction hole communicating with the dust suction hole along a stretch direction. The auxiliary suction body, A pair of left and right rotating brushes rotatably coupled to the dust inlet of the suction body; And And a stretchable brush that can be pulled out along the longitudinal direction of each of the rotating brushes. The auxiliary suction port is a suction unit of the vacuum cleaner, characterized in that formed in the longitudinal direction on the bottom surface of the rotating brush and the expansion brush, respectively. delete According to claim 1, The suction body, A central body having the dust inlet opening downward and having a dust outlet toward the suction pipe, the hinge body extending downward from the dust suction hole and rotatably coupling the pair of rotation brushes to the left and right; And And a main body casing to which the central body and the suction pipe are mounted, and rotatably supporting the pair of rotation brushes. The method according to claim 1 or 3, A first connecting pipe coupled to the suction pipe; And And a second connecting pipe coupled to the main body casing so as to be relatively rotatable with the first connecting pipe. The method of claim 3, wherein the main body casing, A central portion provided with an air flow path between the body mounting portion on which the central body is mounted and the pipe coupling portion communicating with the suction pipe; And And a pair of wing portions extending from the center portion to both sides, the pair of blade portions having an inner portion for guiding rotation of the rotating brush, respectively. The method of claim 5, wherein the inside of the ash, Guide grooves each provided in an arc shape on both side wings at the center of the hinge rib of the central body; And And a guide protrusion protruding from the pivoting brush so as to be accommodated in the guide groove. The method according to claim 5 or 6, The suction unit of the vacuum cleaner, characterized in that it further comprises an elastic member for returning the rotation of the respective rotating brush to its original position. According to claim 3, wherein each of the rotating brush, A hinge portion rotatably coupled to the hinge rib of the central body; And And a pivoting body accommodating the retractable brush retractably and pivoting the hinge portion to the shaft, wherein the auxiliary suction port protrudes from the bottom surface thereof. The method of claim 8, Further comprising a hinge cover coupled to the hinge rib of the central body to which the pair of rotating brushes are coupled, The hinge rib, the hinge cover, the hinge portion, and the rotating body, the suction unit of the vacuum cleaner, characterized in that the air passage hole for mutually communicating with the auxiliary suction port and the dust suction port are provided along the outer circumference. According to claim 1, The expansion brush, A retractable body accommodated in the pivotal brush to withdraw the retractable body and having the auxiliary suction hole formed on a bottom surface thereof; And And a position fixing part for fixing the withdrawal withdrawal position of the expansion and contraction body with respect to the pivoting brush. The method of claim 1, A leaf spring installed on any one side of the contact surface of the expansion brush and the rotation brush; And The suction unit of the vacuum cleaner further comprises; a plurality of engaging jaw provided along the longitudinal direction on the other side, the holding spring and the holding jaw. The method according to claim 10 or 11, wherein A guide guide formed along one side of the withdrawal retracting direction on one side of the contact surface of the rotating brush and the expansion brush; And The suction unit of the vacuum cleaner further comprises a moving protrusion protruding on the other side and movable along the guide guide.