Disposable beverage brewing chamber

A disposable beverage brewing chamber for use with a coffee brewing device having a hot liquid dispenser means and means for receiving and releasably retaining a filter basket below said dispenser means, said means for receiving including quideways for receiving said filter basket in a substantially horizontal sliding fashion, said chamber comprising, in combination:

• (a) a collapsible container having,
• (i) a closed generally horizontal bottom defining an aperture extending generally vertically therethrough for passage of liquid beverage down therethrough,
• (ii) closed vertically collapsible generally vertical sidewalls integral with and defining with said bottom a central cavity;
• (iii) said sidewalls being constructed of materials so as to be movable from a collapsed pre-operative position wherein said container is compacted into a relatively small volume forming a relatively small central cavity to an operative, expanded position wherein said container presents a relatively large cavity with an attendant relatively large volume;
• and
• (iv) an open top communicating with said cavity and bearing a generally horizontal outwardly extending peripheral slide guide rim connected to the upper terminus of said sidewalls, said chamber including said slide guide rim being dimensioned sufficient to allow said chamber to be inserted into said coffee brewing device by substantially horizontally sliding said rim along said guideways;
• and
• (b) a water permeable bag containing a mass of solid brewable beverage material disposed in said cavity against said bottom aperture, said open top and bottom aperture being closed by openable sealing members.