Vacuum-cleaner nozzle

Abstract

The invention relates to a vacuum-cleaner nozzle for vacuuming an underlying surface, having a suction channel which opens out into a suction mouth. In order to form the vacuum-cleaner nozzle such that it has a relatively pronounced suction action for a sustained period of time, it is proposed according to the invention that the vacuum-cleaner nozzle comprises a lifting mechanism which interacts with the underlying surface and by means of which it is possible to change the distance of the suction mouth from the underlying surface on a periodic basis.

1 . Vacuum-cleaner nozzle for vacuuming an underlying surface, the vacuum-cleaner nozzle having a suction channel which opens out into a suction mouth, and a lifting mechanism which interacts with the underlying surface, it being possible, by means of the lifting mechanism, to change the distance of the suction mouth from the underlying surface on a periodic basis.  
   
   
       2 . Vacuum-cleaner nozzle according to  claim 1 , wherein the suction mouth is bounded at least partially in the circumferential direction by a surround which can be raised from the underlying surface, and lowered onto the same, by means of the lifting mechanism.  
   
   
       3 . Vacuum-cleaner nozzle according to  claim 1 , wherein the suction mouth is mounted fixedly on a base plate which can be raised from the underlying surface, and lowered on to the same, by means of the lifting mechanism.  
   
   
       4 . Vacuum-cleaner nozzle according to  claim 1 , the vacuum-cleaner nozzle having a supporting wheel, which can be rotated about an axis of rotation and can be positioned on the underlying surface, and the vacuum-cleaner nozzle being pivotable back and forth about a pivot axis which is oriented parallel to, or coaxially in relation to, the axis of rotation.  
   
   
       5 . Vacuum-cleaner nozzle according to  claim 1 , wherein the width of the suction mouth in the operating direction of the vacuum-cleaner nozzle corresponds at least to the distance covered by the vacuum-cleaner nozzle at a speed of 0.5 m/s along the underlying surface within a raising/lowering cycle of the lifting mechanism.  
   
   
       6 . Vacuum-cleaner nozzle according to  claim 1 , wherein the lifting mechanism can be switched on and off.  
   
   
       7 . Vacuum-cleaner nozzle according to  claim 1 , it being possible to change the extent of the periodic variation in distance.  
   
   
       8 . Vacuum-cleaner nozzle according to  claim 1 , wherein the lifting mechanism has at least one rotatable rolling element which acts on the underlying surface and is coupled to the suction mouth, it being possible for the suction mouth to be raised from the underlying surface, and lowered onto the same, by means of the rolling element.  
   
   
       9 . Vacuum-cleaner nozzle according to  claim 8 , wherein the rolling element is exchangeable.  
   
   
       10 . Vacuum-cleaner nozzle according to  claim 8 , wherein the rolling element is mounted eccentrically.  
   
   
       11 . Vacuum-cleaner nozzle according to  claim 8 , wherein the rolling element is of non-round configuration.  
   
   
       12 . Vacuum-cleaner nozzle according to  claim 11 , wherein the rolling element has a contour in the form of a polygon.  
   
   
       13 . Vacuum-cleaner nozzle according to  claim 11 , wherein the rolling element has a star-shaped contour.  
   
   
       14 . Vacuum-cleaner nozzle according to  claim 8 , wherein the contour of the rolling element is non-symmetrical.  
   
   
       15 . Vacuum-cleaner nozzle according to  claim 14 , wherein the contour of the rolling element is star-shaped and has a plurality of points with in each case two flanks running toward one another, the two flanks being inclined differently in relation to the radial direction of the rolling element.  
   
   
       16 . Vacuum-cleaner nozzle according to  claim 8 , wherein the at least one rolling element has a friction-enhancing covering.  
   
   
       17 . Vacuum-cleaner nozzle according to  claim 8 , wherein the at least one rolling element is configured as a wheel or roller.  
   
   
       18 . Vacuum-cleaner nozzle according to  claim 8 , wherein the rolling element is disposed between a supporting wheel and the suction mouth, as seen in the operating direction of the vacuum-cleaner nozzle.  
   
   
       19 . Vacuum-cleaner nozzle according to  claim 8 , wherein the at least one rolling element is mounted such that it can be adjusted obliquely or perpendicularly in relation to the underlying surface.  
   
   
       20 . Vacuum-cleaner nozzle according to  claim 1 , wherein the lifting mechanism comprises a turbine wheel which can be subjected to the action of a suction flow, is mounted such that it can be rotated about an axis of rotation and the center of gravity of which is disposed at a distance from the axis of rotation, and a supporting element acting on the underlying surface at a distance from the axis of rotation, as seen in the operating direction.  
   
   
       21 . Vacuum-cleaner nozzle according to  claim 20 , wherein the turbine wheel is disposed within the suction channel and does not completely fill the suction-channel cross-section.  
   
   
       22 . Vacuum-cleaner nozzle according to  claim 20 , wherein the turbine wheel is disposed in an end portion of the suction channel which opens out into the suction mouth.  
   
   
       23 . Vacuum-cleaner nozzle according to  claim 17 , wherein the turbine wheel has turbine blades of different mass.  
   
   
       24 . Vacuum-cleaner nozzle according to  claim 1 , wherein the suction mouth is bounded at least partially in the circumferential direction by a surround which forms that region of the vacuum-cleaner nozzle which projects furthest in the direction of the underlying surface.  
   
   
       25 . Vacuum-cleaner nozzle according to  claim 1 , the vacuum-cleaner nozzle having at least one thread-lifting means mounted on a base plate, a surround which bounds the suction mouth at least partially in the circumferential direction having no interruption in its region which is adjacent to the thread-lifting means.  
   
   
       26 . Vacuum-cleaner nozzle according to  claim 1 , wherein a surround which bounds the suction mouth at least partially in the circumferential direction has at least one front crosspiece, which runs transversely to the operating direction, and a rear crosspiece, which runs transversely to the operating direction.