Recirculating type cleaner

• US 5,647,092 A
• Filed: 06/28/1995
• Issued: 07/15/1997
• Est. Priority Date: 10/26/1992
• Status: Expired due to Fees

• Current Assignee: MIWA Science Laboratory Incorporated
• Original Assignee: MIWA Science Laboratory Incorporated
• Inventors: Miwa, Hirohide
• Primary Examiner(s): MOORE, CHRISTOPHER K
• Application Number:
  US08/495,996
• Time in Patent Office: 748 Days
• Field of Search: 15/345, 15/346, 15/402, 15/397
• US Class Current: 15/346
• CPC Class Codes: A47L 5/14 cleaning by blowing-off, also combined with suction cleaning
• CPC Class Codes: A47L 9/08 with means adapted for blowing

Abstract

In a recirculating type cleaner a dust collecting head having a dust collecting port in the bottom thereof is provided, and a nozzle is provided in the dust collecting head. At least a fraction of the after-flow air of a fan is passed through a recirculating tube to the nozzle from which air jet is issued. A contact member is provided in the dust collecting head for contacting carpet piles being cleaned within a portion of the region of the dust collecting port to bend the piles down in the sweeping direction when the cleaner is moved in its sweeping stroke, whereby a gorge is opened in the piles. The nozzle is oriented such that the air jet issued through the nozzle is directed to the bottom of the gorge. Pile bend inverting member is also provided to create the gorge positively by mechanical pushing of the piles just behind the gorge to the reverse direction of the cleaning stroke.

Claims

1. A recirculating type cleaner comprising:

a housing defining a dust collecting chamber therein;

a dust collecting head having dust collecting port means in the bottom thereof, said dust collecting head being movable in a fore and back sweeping direction relative to the piles of a carpet being cleaned;

nozzle means provided in said dust collecting head and having an elongated air outlet at the lower end of said nozzle means for issuing air downwardly, said air outlet being oriented longitudinally in a direction perpendicular to said sweeping direction;

a fan for discharging the air out of said dust collecting chamber;

a suction tube for passing the air drawn from within said dust collecting head into said dust collecting chamber;

a recirculating tube passing at least a fraction of the after-flow air of said fan to said nozzle means for discharge from said dust collecting head through said elongated air outlet; and

pile bending means provided in said dust collecting head for contacting carpet piles being cleaned within at least a portion of the region of said dust collecting port means to bend the piles down to the sweeping direction of said head to thereby open a gorge in the piles, said pile bending means including an elongated first beam-like contact member extending along said elongated air outlet on one side of the nozzle means, and support means for pivotally supporting said beam-like member;

said nozzle means being oriented so that the air discharged through said elongated air outlet is directed to the bottom of said gorge.

2. A recirculating type cleaner according to claim 1, wherein said pile bending means includes a second elongated beam-like contact member extending along said elongated air outlet on the side of the nozzle means opposite to said one side, and connecting means for interconnecting corresponding opposite ends of said first and second elongated beam-like contact members to one another respectively, said support means including a pivot shaft mounted in said connecting means.

3. A recirculating type cleaner according to claim 2, further comprising turning means for pivotally turning said pile bending means until the one of said first and second contact members which leads the other of said contact members in the sweeping direction is brought into contact with the carpet piles.

4. A recirculating type cleaner according to claim 3, wherein said turning means includes contact means affixed to and extending downwardly from said connecting means to engage a surface being cleaned so as to be turned in concert with the sweeping movement of the cleaner.

5. A recirculating type cleaner according to claim 1, further comprising pile bend inverting means for bending down the piles lying in a region just behind said gorge in a direction reverse to said sweeping direction to widen the gorge opening.

6. A recirculating type cleaner according to claim 5, wherein said pile bend inverting means includes contact means for bending the piles down by mechanical contact with the piles lying just behind said gorge.