# US 8,539,639 B2 · Dustcup > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,539,639 B2 - Document ID: US8539639B2 - Status: Granted - Kind: B2 - Application number: 13/124,254 - Filed: 2009-10-05 - Published: 2011-12-22 - Granted: 2013-09-24 - Earliest claimed: 2008-10-10 - Assignees: AB Electrolux - Applicants: Christer Engström; Torkel Ingre - Inventors: Christer Engström; Torkel Ingre - Web page: https://patentgrep.com/patent/US8539639B2 ## CPC - B01D 46/2403: {characterised by the physical shape or structure of the filtering element} - A47L 9/125: {funnel-shaped} - B01D 46/64: arranged concentrically or coaxially - B01D 2265/06: Details of supporting structures for filtering material, e.g. cores - B01D 2279/55: for cleaning appliances, e.g. suction cleaners - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08) ## Abstract It is presented a dust cup housing (11) comprising a filter assembly which comprises an outer filter (25) and an inner filter (24). The outer filter and inner filter are formed as receptacles and the inner filter is slidably insertable into the outer filter. In a mounted position the inner filter is arranged to be substantially fully inserted into the outer filter. The filter assembly further comprises a fixing member (40, 41; 50, 51; 60, 61) which is arranged to retain the inner filter in a predetermined displacement (d) position relative to the mounted position, in response to the inner filter being subjected to an extraction force for detaching the filter assembly from the dust cup housing. Thereby a user of the filter is in a convenient and intuitive way alerted that the filter assembly comprises more than one filter. ## Claims ### Claim 1 A dust cup comprising: a dust cup housing encompassing a dust cup chamber, said dust cup housing further comprising an air inlet and an air outlet defining a path for a dust laden air-stream to flow through said dust cup chamber, and which air outlet is arranged to be connectable to an air suction element, to which said path is in fluid communication; a filter assembly having a first end which is removably arranged at said air outlet for filtering said dust-laden air-stream; said filter assembly comprising an outer filter and an inner filter, wherein said outer filter and said inner filter are formed as receptacles which are concentrically and unidirectionally arranged with a respective receptacle opening directed towards said first end of the filter assembly, and wherein said inner filter is slidably insertable into said outer filter, and wherein in a mounted position said inner filter is arranged to be substantially fully inserted into said outer filter; characterized in that said filter assembly further comprising a fixing member which is arranged to retain the inner filter in a predetermined displacement position relative to said mounted position, in response to said inner filter being subjected to an extraction force for detaching said filter assembly from said dust cup housing. ### Claim 2 (depends on 1) A dust cup according to claim 1 , wherein said fixing member is arranged, such that said inner filter, upon being subjected to an extraction force larger than a predetermined threshold force, is detachable from said outer filter. ### Claim 3 (depends on 2) A dust cup according to claim 2, wherein said filter assembly is detachable from said housing, upon being subjected to an extracting force being smaller than said predetermined threshold force. ### Claim 4 (depends on 1) A dust cup according to claim 1, wherein said fixing member comprises a protruding portion arranged on an outer surface of the receptacle of said inner filter, which protruding portion is further arranged to slide in a receiving portion arranged on an inner surface of the receptacle of said outer filter. ### Claim 5 (depends on 1) A dust cup according to claim 1, wherein said fixing member comprises a protruding portion arranged on an inner surface of the receptacle of said outer filter, which protruding portion is further arranged to slide in a receiving portion arranged on an outer surface of the receptacle of said inner filter. ### Claim 6 (depends on 1) A dust cup according to claim 1, wherein said fixing member comprises friction surfaces arranged on said inner surface of said outer filter and said outer surface of said inner filter. ### Claim 7 (depends on 4) A dust cup according to claim 4, wherein said receiving portion has a length corresponding to said predetermined displacement. ### Claim 8 (depends on 1) A dust cup according to claim 1, wherein said inner filter comprises a first grip element. ### Claim 9 (depends on 1) A dust cup according to claim 1, wherein said outer filter comprises a second grip element. ### Claim 10 (depends on 1) A dust cup according to claim 1, wherein said receptacles have one of a cup shape, conical, and a frusto-conical shape. ### Claim 11 (depends on 1) A vacuum cleaner apparatus comprising a dust cup according to claim 1.