Cyclonic vacuum cleaner cone

Claim 1

In combination with dust collecting apparatus of the type having a dust canister, and suction means for drawing air-borne dust particles tangentially into a chamber above said canister, a dust separating device in said chamber, comprising a one-piece separator body having therethrough an axial bore which is generally truncated conical in configuration, said bore defining in said body an internal conical surface having a larger end opening on one end of said body, and a smaller end opening on the opposite end of said body, flange means on said body adjacent said one end thereof for supporting said body in said chamber with said larger end of said conical surface positioned to have said air-borne dust particles enter said larger end tangentially, and with the smaller end of said conical surface communicating with the interior of said canister, and an integral rib projecting radially inwardly from said internal conical surface of said body, and extending continuously in a spiral path at an angle of approximately 12°, and for approximately one and one-half revolutions between said larger and smaller end, respectively, of said conical surface, said rib being generally V-shaped in cross section, and having intersecting sides that are substantially equal in width.