Patent ID: 7021391

Claim:
A portable fire extinguisher comprising: a blower tube assembly having: an outer tube that defines an inner mixing chamber disposed adjacent to an outlet port adapted to direct a discharge flow of a mixed air and fire retardant out of the outer tube to extinguish a fire, wherein the inner mixing chamber is adapted for communication with a portable reservoir containing a liquid fire retardant which is enabled to flow into the inner mixing chamber; an inner tube defining a blower tube inlet port adapted to receive the outlet port of a portable forced air blower, wherein the inner tube is disposed for communication with the inner mixing chamber to enable a continuous volume of forced air to flow from a portable forced air blower, through the inner tube into the inner mixing chamber of the outer tube; at least one ambient air intake port disposed for communication with the inner mixing chamber to channel ambient air, disposed outside the outer tube, to enter into the inner mixing chamber to mix with a flow of forced air and fire retardant for discharge through the outlet port of the outer tube; at least one spacer support disposed between the outer tube and the inner tube so that the relative position of outer tube from the inner tube is substantially fixed, and wherein the ambient air intake port is defined by a passage formed between the outer tube and the inner tube, adjacent the spacer support.