Cleaner head

Abstract

The present invention relates to a cleaner head including: front housing and a rear housing disposed side by side on front and rear sides thereof respectively, the rear housing having an air outlet formed thereon; a front brush rotatably disposed on the front housing in such a manner as to be exposed from the underside of the front housing; a rear brush rotatably disposed the rear housing in such a manner as to be exposed from the underside of the rear housing; driving motors built in the rear housing to rotate the front brush and the rear brush through a power transmission mechanism; and a lifting unit disposed on one side of the rear housing to move up and down the front housing with respect to the rear housing in a hinged manner, whereby if necessary, the front brush is lifted or stretched out to come into contact with the floor, thereby optimally maintaining cleaning effects according to places, minimizing a resistance occurring while moving, and reducing an area occupying the floor while being kept in a given place.

1 . A cleaner head comprising:
 a front housing and a rear housing disposed side by side on front and rear sides thereof respectively, the rear housing having an air outlet formed thereon;   a front brush rotatably disposed on the front housing in such a manner as to be exposed from the underside of the front housing;   a rear brush rotatably disposed the rear housing in such a manner as to be exposed from the underside of the rear housing;   driving motors built in the rear housing to rotate the front brush and the rear brush through a power transmission mechanism; and   a lifting unit disposed on one side of the rear housing to move up and down the front housing with respect to the rear housing in a hinged manner.   
     
     
         2 . The cleaner head according to  claim 1 , wherein the lifting unit comprises:
 a housing frame disposed on one side of the rear housing;   a driving and rotating piece rotatably coupled to the housing frame, coupled to one side of the front housing, and having first gear teeth formed on at least a portion of a periphery thereof;   an intermediate gear rotatably coupled to the housing frame and having second gear teeth engaging with the first gear teeth;   a locking and supporting piece extended from the intermediate gear in a direction of a rotating shaft of the intermediate gear;   a rotating and locking piece rotatably coupled to the housing frame and intermittently engageable with the locking and supporting piece; and   a spring connected at one end thereof to the driving and rotating piece and at the other end thereof to the housing frame.   
     
     
         3 . The cleaner head according to  claim 1 , wherein the locking and supporting piece has a locking threshold part formed thereon in a circumferential direction thereof, and the rotating and locking piece has a hook formed on one end thereof in such a manner as to be lockable on the locking threshold part. 
     
     
         4 . The cleaner head according to  claim 2 , wherein the lifting unit further comprises an operating pedal hinge-movable up and down with respect to the housing frame in such a manner as to come into contact with the rotating and locking piece to allow the rotating and locking piece to be reciprocatingly hinge-movable to the housing frame. 
     
     
         5 . The cleaner head according to  claim 2 , wherein one end of the spring is connected to the driving and rotating piece by means of a load connecting piece. 
     
     
         6 . The cleaner head according to  claim 5 , wherein the driving and rotating piece and the load connecting piece are coupled to each other in a hinge-movable manner. 
     
     
         7 . The cleaner head according to  claim 4 , wherein the housing frame has a hinge part extended in a direction toward the longitudinal center of the cleaner head in such a manner as to be hinge-coupled to the operating pedal. 
     
     
         8 . The cleaner head according to  claim 7 , wherein the hinge part has hinge grooves open upward on top thereof, and the operating pedal has a hinge pin disposed on the front top side thereof in such a manner as to be hinge-coupled to the hinge grooves. 
     
     
         9 . The cleaner head according to  claim 8 , wherein the rotating and locking piece has a locking groove formed on one end thereof in such a manner as to be open on the underside thereof, and the operating pedal has a locking protrusion extended laterally from the front lower end thereof in such a manner as to be inserted into the locking groove. 
     
     
         10 . The cleaner head according to  claim 8 , wherein a compression spring is connected between a point spaced downward from the hinge grooves of the housing frame and a point spaced downward from the hinge pin of the operating pedal. 
     
     
         11 . The cleaner head according to  claim 2 , wherein a damping gear is rotatably coupled to the housing frame in such a manner that the damping gear is engaged with the intermediate gear. 
     
     
         12 . The cleaner head according to  claim 2 , wherein the driving and rotating piece comprises a first coupling portion protruding from the outer surface thereof in such a manner as to have the same center as the rotary shaft of the rear brush and a second coupling portion formed spaced apart from the first coupling portion, and the front housing comprises a third coupling portion and a fourth coupling portion formed on one side end thereof in such a manner as to be coupled correspondingly to the first coupling portion and the second coupling portion.