Patent ID: 6051138
Filing Date: 2000-04-18
Classification: B01D

Abstract:
A filter device comprising:an elongated flexible fluid permeable tubular sheet including a plurality of woven groups of strands, said tubular sheet having inner and outer walls and an output end and a remote end;a coating of filter aid material on the outer walls of said tubular sheet for collecting fluid contaminants;an inner helical spring for supporting a first portion of the inner walls of said sheet anchored at said output end and extending toward said remote end of said tubular sheet, said spring having a length which is substantially shorter than the length of said sheet when said sheet is in an axially extended condition;an outlet flange at said output end of said tubular sheet securing and supporting said sheet;means connected at said remote end to tension and detension the tubular sheet to cause axial tension and axial retraction of said tubular sheet;and means enclosing said remote end of said sheet including means for securing and holding said remote end and for connecting to said means to tension and detension said tubular sheet and to permit movement of said remote end and removal of said filter aid material and fluid contaminants;wherein a second portion of the inner walls of said sheet located between said first portion and said enclosing means is unsupported such that said unsupported second portion can be agitated by attachments to the remote end of the tubular sheet.