Suction head with improved suction channel

Abstract

A suction head for a vacuum cleaner comprising a base plate with a base plate channel open towards a surface to be vacuumed and a suction channel in fluid communication with the base plate channel is described. Said suction channel comprises an inner tube and an outer tube, wherein the inner tube is fixed to the base plate channel and the outer tube is rotatable telescopically with respect to the inner tube.

1 . A suction head for a vacuum cleaner or the like comprising:
 a base plate with a base plate channel open towards a surface to be vacuumed,   a suction channel in fluid communication with the base plate channel,
 wherein said suction channel comprises an inner tube and an outer tube, 
 wherein the inner tube is fixed to the base plate channel and the outer tube is rotatable telescopically with respect to the inner tube, 
   a bushing fixed to said outer tube and a pivot pin, wherein said outer tube is rotatable about an axis of rotation of the pivot pin,   an axle and wheels mounted at the ends of said axle for moving said suction head on the surface to be vacuumed,
 wherein said pivot pin of the outer tube is arranged in front of the axle, and 
   an arm arrangement with first holes for the pivot pin and second holes for the axle of the wheels.   
     
     
         2 . The suction head of  claim 1 , wherein said outer tube comprises a first part with a longitudinal axis which follows a circumference portion. 
     
     
         3 . The suction head of  claim 2 , wherein said first part of the outer tube has a substantially circular cross-section measured along a plane perpendicular to said longitudinal axis. 
     
     
         4 . The suction head of  claim 3 , wherein said inner tube comprises a first part that receives fluid and a second part, wherein said second part of the inner tube has an outer surface substantially corresponding to an inner surface of the first part of the outer tube. 
     
     
         5 . The suction head of  claim 3 , wherein said inner tube terminates with a sealing lip. 
     
     
         6 . The suction head of  claim 1 , wherein said arm arrangement comprises two arms. 
     
     
         7 . The suction head of  claim 1 , wherein said outer tube comprises a second part having a reduced wall thickness and a circular notch for rotatably engaging an end edge of a joint. 
     
     
         8 . The suction head of  claim 1 , wherein the base plate channel comprises a front edge and a rear edge, wherein at least the surface of the lower face which extends along the front edge of the base plate channel and at least the surface of the lower face which extends along the rear edge of the base plate channel lie on a same plane.