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Title: Horseshoe-shaped vacuum cleaner filter bag
Claims: What is claimed is: 1. A vacuum cleaner filter bag comprising first and second substantially identical horseshoe-shaped planar sheets of porous material which permit air to penetrate and flow therethrough, connecting means for connecting peripheral edges of said sheets to provide two tubular leg portions and a tubular connecting portion between said leg portions to define a continuous wall enclosing a horseshoe-shaped cavity, said connecting means being disposed along a longitudinal plane of symmetry extending through said tubular leg and connecting portions, said tubular leg portions being generally identical and symmetrically disposed on opposite sides of a transverse plane of symmetry extending through said tubular connecting portion, air inlet means provided on said tubular connecting portion in said first sheet of porous material for admitting a stream of air under pressure into said cavity, the stream of air generally impinging on an inner surface portion of said first sheet of porous material disposed within said tubular connecting portion, said inner surface portion being disposed on each side of said transverse plane of symmetry and on only one side of said longitudinal plane of symmetry in a position between said air inlet means and said tubular leg portions, air impervious blocking means for directing the stream of air and debris carried thereby into said tubular leg portions, said air impervious blocking means being provided on said inner surface portion to decrease overall porosity at said inner surface portion so that the stream of air is not materially dissipated by passage and penetration through said tubular connecting portion, said air impervious blocking means including a planar smooth sheet of flexible non-abrasive plastic material covering said inner surface portion, fastening means for securing said flexible plastic sheet material to said inner surface portion, opening means disposed in said tubular connecting portion to provide an opening through which the debris may be expelled from said cavity, said opening means being defined by peripheral end portions of said first and second sheets, said end portions being disposed along said longitudinal plane of symmetry and spaced from said flexible plastic sheet by said air inlet means, and closure means for securing said end portions together to close said opening means during use of said filter bag and for permitting said end portions to be separated from each other to open said opening means for removal of accumulated debris from within said cavity. 2. A vacuum cleaner filter bag as defined in claim 1, wherein said sheets of porous material comprise a cloth material. 3. A vacuum cleaner filter bag as defined in claim 1, wherein said connecting means comprises stitching. 4. A vacuum cleaner filter bag as defined in claim 1, wherein said flexible plastic material comprises a sheet of acetate. 5. A vacuum cleaner filter bag as defined in claim 1, wherein said flexible plastic material comprises a sheet of vinyl. 6. A vacuum cleaner filter bag as defined in claim 1, wherein said fastening means comprises a heat seal extending about a peripheral edge of said plastic flexible sheet. 7. A vacuum cleaner filter bag as defined in claim 1, wherein said closure means comprises an elongate resilient substantially U-shaped member having two opposing legs having substantially parallel facing surfaces to permit said end portions to be received between said legs in pressure relation to maintain said opening means closed. 8. A vacuum cleaner filter bag as defined in claim 7, wherein said legs are provided with opposing lips at free edges thereof, each lip extending in the direction of the other lip to form a substantially open channel having open ends and a groove between said lips; and further comprising elongate stiffening means provided along said peripheral end portions which are receivable within said channel through one of said open ends to prevent separation of said U-shaped member from the bag. 9. A vacuum cleaner filter bag as defined in claim 8, wherein sections of said stiffening means are resistive to flexing and deformation. Other info: Inventors: Howard, Sol (Brookville, NY, US) Schaaf, Robert (Ozone Park, NY, US) Application Number: 544804 Filing Date: 1975-01-28 Publication_date: 1976-08-10 Assignee: Primary Class(es): 55/363 55/368, 55/370, 55/376, 55/380, 55/382, 55/DIG2 Other Classes: US Patent Ref:
Other Refs:
Primary Examiner: Lutter, Frank W. Assistant Examiner: Prunner, Kathleen J. Attorney: Friedman & Goodman |
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