Screening device

Abstract

A screening tube 1 having a stored state and a deployed state. The tube 1 is self supporting when in the deployed state and is collapsible from the deployed state to the stored state. The tube 1 comprises a flexible tubular sheet 15 that defines a screened space within the bore of the tube 1 . The tube 1 may comprise walls. The screening tube 1 may be provided with a coil 13 to support the walls 15 of the tube when the tube 1 is in the deployed state.

1 . A screening tube having a stored state and a deployed state, the tube being self supporting when in the deployed state and being collapsible from the deployed state to the stored state, the tube comprising a flexible tubular sheet that defines a screened space within the bore of the tube.  
   
   
       2 . A screening tube according to  claim 1  wherein the tube comprises tube walls and a coil to support the walls of the tube when the tube is in the deployed state.  
   
   
       3 . A screening tube according to  claim 2  wherein the coil is a compression spring.  
   
   
       4 . A screening tube according to  claim 3  wherein restriction means are provided for restricting expansion of the compression spring when the screening tube is in the deployed state.  
   
   
       5 . A screening tube according to  claim 4  wherein the restriction means are adjustable restriction means to allow adjustment of the height of the screening tube when the tube is in the deployed state.  
   
   
       6 . A screening tube according to  claim 3  wherein a restrictor is provided for restricting expansion of the compression spring when the screening tube is in the deployed state.  
   
   
       7 . A screening tube according to  claim 4  wherein the restrictor is an adjustable restrictor allowing height adjustment of the screening tube when the tube is in the deployed state.  
   
   
       8 . A screening tube according to  claim 2  wherein the coil is a tension spring and a support member is provided to support the tube when the tube is in the deployed state.  
   
   
       9 . A screening tube according to  claim 2  wherein the coil is an inflatable coil.  
   
   
       10 . A screening tube according to  claim 1  wherein the tube comprises tube walls and a compressible support member in at least a portion of a wall of the tube to support the walls of the screening tube when the tube is in the deployed state.  
   
   
       11 . A screening tube according to  claim 1  wherein the tube comprises a removable base portion.  
   
   
       12 . A screening tube according to  claim 1  wherein the tube is open at both ends.  
   
   
       13 . A screening tube according to  claim 1  wherein the tube comprises means for securing the tube to the ground.  
   
   
       14 . A screening tube according to  claim 13  wherein the means for securing the tube to the ground comprise spikes arranged for placement in the ground.  
   
   
       15 . A screening tube according to  claim 1  wherein the tube is of circular cross section.  
   
   
       16 . A screening tube according to  claim 1  wherein the tube is of square cross section.  
   
   
       17 . A screening tube according to  claim 1  wherein the tube is of polygonal cross section.  
   
   
       18 . A screening tube according to  claim 17  wherein the polygon is a regular polygon.  
   
   
       19 . A screening tube according to  claim 17  wherein the polygon is an irregular polygon.  
   
   
       20 . A screening tube according to  claim 1  wherein when the tube is in a stored state the screening tube may be used as a buoyancy aid.  
   
   
       21 . A screening tube having a stored state and a deployed state, the tube being self supporting when in the deployed state and being collapsible from the deployed state to the stored state, the tube comprising a flexible tubular sheet that defines a screened space within the bore of the tube and a coil to support walls of the tube when the tube is in the deployed state.  
   
   
       22 . A screening tube having a stored state and a deployed state, the tube comprising support means for supporting the tube when the tube is in the deployed state, the tube being collapsible from the deployed state to the stored state, the tube comprising a flexible tubular sheet that defines a screened space within the bore of the tube.  
   
   
       23 . A screening tube having a stored state and a deployed state, the tube being self supporting when in the deployed state and being collapsible from the deployed state to the stored state, the tube comprising a flexible tubular sheet that defines a screened space within the bore of the tube and forms walls of the tube and an inflatable coil to support the walls of the tube.  
   
   
       24 . A screening tube having a stored state and a deployed state, the tube being self supporting when in the deployed state and being collapsible from the deployed state to the stored state, the tube comprising a flexible tubular sheet that defines a screened space within the bore, the tube arranged so that when the tube is in a stored state the screening tube may be used as a bouyancy aid.