Cleaner head

Abstract

A cleaner head for a vacuum cleaning appliance includes a suction cavity having a downwardly-directed opening through which debris enters the suction cavity. The opening is bounded in part by a front edge and a rear edge which is substantially co-planar with the front edge. A thread lifting strip is mounted on a support located within and moveable relative to the suction cavity. A spring urges the support in a direction extending towards the opening.

1 . A cleaner head for a vacuum cleaning appliance, the cleaner head comprising:
 a suction cavity having a downwardly-directed opening through which debris enters the cleaner head; and   a thread lifting strip located within the suction cavity and which is moveable relative to the opening.   
     
     
         2 . The cleaner head of  claim 1 , wherein the thread lifting strip is moveable relative to a plane containing the opening. 
     
     
         3 . The cleaner head of  claim 1 , wherein the thread lifting strip is moveable towards and away from the opening. 
     
     
         4 . The cleaner head of  claim 1 , wherein the thread lifting strip is connected to a surface of a wall of the cleaner head. 
     
     
         5 . The cleaner head of  claim 4 , wherein the surface is located within the suction cavity. 
     
     
         6 . The cleaner head of  claim 1 , wherein the suction cavity surrounds the thread lifting strip. 
     
     
         7 . The cleaner head of  claim 1 , wherein the thread lifting strip is biased towards a plane containing the opening. 
     
     
         8 . The cleaner head of  claim 1 , wherein the thread lifting strip is moveable relative to the opening. 
     
     
         9 . The cleaner head of  claim 8 , comprising a support on which the thread lifting strip is disposed, and wherein the support is moveable relative to the opening. 
     
     
         10 . The cleaner head of  claim 9 , wherein the support is biased towards a plane containing the opening. 
     
     
         11 . The cleaner head of  claim 9 , comprising at least one resilient member for urging the support towards a plane containing the opening. 
     
     
         12 . The cleaner head of  claim 11 , wherein the at least one resilient member comprises at least one torsion spring. 
     
     
         13 . The cleaner head of  claim 9 , wherein the thread lifting strip is mounted on the support. 
     
     
         14 . The cleaner head of  claim 9 , wherein the support is connected to a cavity wall defining, at least in part, the suction cavity. 
     
     
         15 . The cleaner head of  claim 14 , wherein the support is pivotably connected to the cavity wall. 
     
     
         16 . The cleaner head of  claim 15 , wherein the support is pivotable about an axis extending substantially parallel to a plane containing the opening. 
     
     
         17 . The cleaner head of  claim 14 , wherein the cavity wall defines one of a front edge and a rear edge of the opening. 
     
     
         18 . The cleaner head of  claim 14 , wherein the support comprises at least one arm which extends outwardly therefrom and which is connected to the cavity wall for movement relative thereto. 
     
     
         19 . The cleaner head of  claim 9 , wherein the support is moveable between a raised position and a lowered position, and the cleaner head comprises a stop member for inhibiting movement of the support beyond the lowered position. 
     
     
         20 . The cleaner head of  claim 19 , wherein the support comprises said stop member. 
     
     
         21 . The cleaner head of  claim 19 , wherein the stop member is arranged to abut a surface defining, at least in part, said suction cavity. 
     
     
         22 . The cleaner head of  claim 19 , wherein the thread lifting strip is located within a recessed portion of the support. 
     
     
         23 . The cleaner head of  claim 22 , wherein the recessed portion of the support comprises a front support edge and a rear support edge, and wherein the edges do not extend downwardly beyond a plane containing the opening when the support is in its lowered position. 
     
     
         24 . The cleaner head of  claim 23 , wherein one of the support edges protrudes further from the support than the other support edge.