Nozzle assembly of vacuum cleaner

1. A nozzle assembly of a vacuum cleaner, comprising:

a main casing having an air inlet formed thereto to draw in dust or dirt from a surface to be cleaned;

a drum brush disposed in the main casing to brush away the dust or dirt adhered to the surface to be cleaned while rotating in contact with the surface to be cleaned; and

a subsidiary brush unit disposed in front of the main casing to preliminarily brush away the dust or dirt adhered to the surface to be cleaned in front of the drum brush, the subsidiary brush unit having a cover disposed in front of the main casing, and the subsidiary brush unit having a subsidiary brush member to come in elastic contact with the surface to be cleaned,

wherein the subsidiary brush member is configured to change a relative position within the cover, and thus to selectively maintain a contact state or a non-contact state to the surface to be cleaned.

2. The nozzle assembly as claimed in claim 1 , wherein the subsidiary brush unit further comprises:

a fixing panel to which the subsidiary brush member is connected; and

a height adjusting part to move the fixing panel in an up-and-down direction so as to adjust a height of the subsidiary brush member.

3. The nozzle assembly as claimed in claim 2 , wherein the height adjusting part comprises:

at least one inclined rail disposed on an upper surface of the fixing panel, the at least one inclined rail having a plurality of fixing projections;

a handle having one side exposed to the outside of the cover and the other side having at least one locking projection formed thereon; and

a fixing part having at least one projecting hook slidably joined with the at least one inclined rail, and an extended tube to lock the at least one locking projection.

4. The nozzle assembly as claimed in claim 2 , wherein the subsidiary brush member comprises:

a subsidiary brush casing rotatably disposed to the fixing panel; and

a subsidiary brush joined to the subsidiary brush casing.

5. The nozzle assembly as claimed in claim 4 , wherein the subsidiary brush is detachably joined to the subsidiary brush casing.

6. The nozzle assembly as claimed in claim 4 , wherein the subsidiary brush comprises a plurality of protrusions projected from a surface thereof facing the surface to be cleaned.

7. The nozzle assembly as claimed in claim 1 , wherein the cover is detachably mounted to the main casing.

8. The nozzle assembly as claimed in claim 2 , wherein the subsidiary brush member is disposed to be rotatable to the fixing panel.

9. A nozzle assembly of a vacuum cleaner, comprising:

a main casing having an air inlet formed thereto to draw in dust or dirt from a surface to be cleaned;

a drum brush disposed in the main casing to brush away the dust or dirt adhered to the surface to be cleaned while rotating in contact with the surface to be cleaned; and

a subsidiary brush unit disposed in front of the main casing to preliminarily brush away the dust or dirt adhered to the surface to be cleaned in front of the drum brush, the subsidiary brush unit having a cover disposed in front of the main casing, and the subsidiary brush unit having a subsidiary brush member to come in elastic contact with the surface to be cleaned,

wherein the subsidiary brush member is configured to change a relative position to the cover, and thus to selectively maintain a contact state or a non-contact state to the surface to be cleaned,

wherein the subsidiary brush unit further comprises:

a fixing panel to which the subsidiary brush member is connected; and

a height adjusting part to move the fixing panel in an up-and-down direction so as to adjust a height of the subsidiary brush member, and

wherein the height adjusting part comprises:

at least one inclined rail disposed on an upper surface of the fixing panel, the at least one inclined rail having a plurality of fixing projections;

a handle having one side exposed to the outside of the cover and the other side having at least one locking projection formed thereon; and

a fixing part having at least one projecting hook slidably joined with the at least one inclined rail, and an extended tube to lock the at least one locking projection.

10. A nozzle assembly of a vacuum cleaner, comprising:

a main casing having an air inlet formed thereto to draw in dust or dirt from a surface to be cleaned;

a drum brush disposed in the main casing to brush away the dust or dirt adhered to the surface to be cleaned while rotating in contact with the surface to be cleaned; and

a subsidiary brush unit disposed in front of the main casing to preliminarily brush away the dust or dirt adhered to the surface to be cleaned in front of the drum brush, the subsidiary brush unit having a cover disposed in front of the main casing, and the subsidiary brush unit having a subsidiary brush member to come in elastic contact with the surface to be cleaned,

wherein the subsidiary brush member is configured to change a relative position to the cover, and thus to selectively maintain a contact state or a non-contact state to the surface to be cleaned,

wherein the subsidiary brush unit further comprises:

a fixing panel to which the subsidiary brush member is connected; and

a height adjusting part to move the fixing panel in an up-and-down direction so as to adjust a height of the subsidiary brush member, and

wherein the subsidiary brush member is disposed to be rotatable to the fixing panel.