# US 2013/0152519 A1 · Dust collector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0152519 A1 - Document ID: US20130152519A1 - Status: Published application - Kind: A1 - Application number: 13/677,886 - Filed: 2012-11-15 - Published: 2013-06-20 - Earliest claimed: 2011-12-20 - Assignees: Makita Corporation - Inventors: Ryosuke HARA; Takayuki TAHARA - Web page: https://patentgrep.com/patent/US20130152519A1 ## CPC - B01D 46/71: with pressurised gas, e.g. pulsed air - A47L 5/28: Suction cleaners with handles and nozzles fixed on the casings, e.g. wheeled suction cleaners with steering handle (A47L5/24 takes precedence) - A47L 9/20: Means for cleaning filters - 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 A dust collector having a filter for catching dust in air flowing in an intake path is provided. A pair of the intake paths are formed so as to be combined together on an upstream side of an electric blower provided in a main body. A pair of communication paths allow a discharge passage to communicate with each of the intake paths. A first opening and closing member is provided so as to open and close the intake path, and in a normal state, is biased to open the intake path. A second opening and closing member is provided so as to open and close the communication path, and in the normal state, is biased to close the communication path, and opens the communication path in response to a closing operation of the intake path by the first opening and closing member. ## Claims ### Claim 1 A dust collector, comprising: a tank having a suction port in an upper part thereof; and a main body including an electric blower, wherein air that is drawn through the suction port from outside by the electric blower is discharged through the tank and the main body, and a filter that separates the suction port from the main body in an intake path extending from the suction port to the electric blower and that is capable of catching dust in the air is provided in the tank, the dust collector further comprising: a pair of the intake paths in which air flows respectively through a pair of the filters projecting within the tank, and formed so as to be combined together on an upstream side of the electric blower; a pair of communication paths that allow a discharge passage on a downstream side of the electric blower to communicate with each of the intake paths; first opening and closing members each provided on a downstream side of the communication path in the intake path, capable of opening and closing the intake path, and formed so as to be biased, in a normal state, to a position where the first opening and closing member opens the intake path; second opening and closing members each provided in the communication path, capable of opening and closing the communication path, formed so as to be biased, in the normal state, to a position where the second opening and closing member closes the communication path, and to open the communication path in response to a closing operation of closing the intake path by the first opening and closing member; and an operation unit capable of alternately causing the first opening and closing members in the intake paths to perform the closing operation, wherein when the operation unit causes one of the first opening and closing members to perform the closing operation and thus causes the second opening and closing member to open the communication path, discharged air in the discharge passage is guided to one of the intake paths via the communication path, the discharged air is caused to flow backward in the intake path and returned to the tank through the filter, and is guided to the other intake path, so that the dust on the filter of the one intake path is removed. ### Claim 2 (depends on 1) The dust collector according to claim 1, wherein the operation unit includes a motor placed between the pair of first opening and closing members, and a cam member provided on an output shaft of the motor and formed to alternately contact the first opening and closing members respectively in response to rotation of the output shaft so that the first opening and closing member performs the closing operation. ### Claim 3 (depends on 2) The dust collector according to claim 2, wherein the filters through which air flows in the pair of intake paths are placed outside the motor so as to face each other with an interval therebetween, and each of the first opening and closing members is placed between each of the filters and the motor. ### Claim 4 (depends on 1) The dust collector according to claim 1, wherein the filter includes a primary filter capable of catching the dust and having been subjected to an antistatic treatment. ### Claim 5 (depends on 1) The dust collector according to claim 1, wherein a tilted portion having a vent hole is provided on the downstream side of the communication path in the intake path so as to face the first opening and closing member in the normal state with a space for air flow therebetween, and the first opening and closing member performing the closing operation is capable of contacting the tilted portion in a state where the vent hole is closed and the space for air flow is eliminated. ### Claim 6 (depends on 5) The dust collector according to claim 5, wherein the first opening and closing member is supported by a support shaft near the tilted portion in the intake path so as to be rotatable in a direction toward and away from the tilted portion via the support shaft, and when the cam member contacts the first opening and closing member, the first opening and closing member rotates in the direction toward the tilted portion, and thus performs the closing operation and contacts the tilted portion. ### Claim 7 (depends on 6) The dust collector according to claim 6, wherein an inlet port that allows the discharge passage to communicate with the intake path is formed in the communication path, and in the normal state, the second opening and closing member is biased to a position where the second opening and closing member closes the inlet port, the second opening and closing member includes a bar-shaped arm portion having a distal end thereof facing the first opening and closing member, and a support shaft for supporting the second opening and closing member in the communication path so that the second opening and closing member is rotatable in a direction toward and away from the inlet port, and the first opening and closing member that rotates in a direction toward the tilted portion presses the second opening and closing member through the arm portion, whereby the second opening and closing member rotates in the direction away from the inlet port to open the inlet port. ### Claim 8 (depends on 4) The dust collector according to claim 4, wherein the primary filter is formed as a cylindrical body, a tertiary filter as a cylindrical body is mounted inside the primary filter so that a filter surface of the tertiary filter faces an inner surface of the primary filter, and a secondary filter is mounted on the filter surface of the tertiary filter. ### Claim 9 (depends on 8) The dust collector according to claim 8, wherein the primary filter is made of woven fabric, the secondary filter is made of polyurethane sponge, and the tertiary filter is made of paper. ### Claim 10 (depends on 8) The dust collector according to claim 8, wherein the main body has a filter fixing member, a latch member capable of swinging via a support shaft is attached to a side surface of the filter fixing member, and an engagement member with which the latch member is engaged is attached to a peripheral edge of an upper part of the primary filter. ### Claim 11 (depends on 1) The dust collector according to claim 1, further comprising: a traveling base having a recess in an upper surface thereof and having a wheel rotatably provided on a bottom surface thereof, wherein the tank is placed on the traveling base so as to be fitted in the recess. ### Claim 12 (depends on 1) The dust collector according to claim 1, wherein a hook is attached to an outer side surface of the tank, and a hook engagement portion that engages with the hook is provided in the main body.