Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1997-07-01
2000-11-07
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15331, A47L 514
Patent
active
061418234
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a blower-vacuum apparatus, and more particularly, to a type thereof capable of switching between an air blowing blower mode and an air sucking vacuum mode.
BACKGROUND ART
A conventional blower-vacuum apparatus is disclosed in U.S. Pat. No. 4,870,714. According to the disclosed apparatus, an air suction port and an air discharge port are formed in a main body, so that the air suction port is in confrontation with a fan disposed in the main body and the air discharge port is positioned perpendicularly with respect to an axis of the fan. In a vacuum mode, the air suction port is connected to a suction tube (vacuum nozzle) and the air discharge port is connected to a dust bag. By rotation of the fan, air and dust is introduced into the suction tube and directed into the dust bag through the main body. In the blower mode, the suction tube is detached from the air suction port, and a filter is attached to an open end of the air suction port for preventing dust from being introduced into the main body. Further, the dust bag is detached from the air discharge port, and an air blower tube (blower nozzle) having a tapered shape in which a diameter is gradually reduced toward its tip is connected to the air discharge port. Accordingly, air passing through the filter and introduced into the main body is blown outside through the air blower tube.
However, each time the blower-vacuum apparatus disclosed in the U.S. Pat. No. 4,870,714 is switched between the vacuum mode and the blower mode, the suction tube and the filter must be exchanged and the dust bag and the air blower tube must be exchanged, which is troublesome.
Japanese Utility Model Application laid open publication No. Hei 4-80454 discloses a dust collecting apparatus in which a suction tube (vacuum nozzle) extending in a axial direction of a fan is connected to a main body, and an outlet tube extending in a direction perpendicular to the axis of the fan is connected to a dust bag through a joint. The joint is provided with a branch pipe to which a blower tube (blower nozzle) is connected through a rubber tube. A blower opening of the blower tube is positioned close to a suction opening of the suction tube. Air and dust introduced into the suction tube is directed into the dust bag through the main body, the outlet tube, and the joint. A part of the suction air is also directed to the blower tube through the branch pipe, so that the air is blown to a position close to the opening of the suction tube. Because of this air, rubbish and dust accumulated in indentations on the ground is blown out of the indentations to facilitate suction of the flying rubbish and dust into the suction tube.
However, the dust collecting apparatus disclosed in the laid open Utility Model Application publication No. Hei 4-80454 blows air during suction cleaning work so that a part of the suction air sucked through the suction tube is utilized for air blowing. Accordingly, the blowing air may contain dust, thereby lowering the dust-collecting efficiency of the device. Further, the device is not designed to operate in a blower mode only.
Japanese Utility Model laid open application publication No. Hei 3-92454 discloses a dust collecting apparatus in which one end of an air feed tube is connected to a blower and another end of the air feed tube is connected to a confluence tube which is connected to a dust bag. The confluence tube includes an air feed passage, a dust suction passage and a branch passage. Further, a pivotable change-over valve is provided in the confluence tube. The air feed passage approximately linearly connects the air feed tube and the dust bag. The dust suction passage branches off the air feed passage and has one end connected to a cleaning tube. The branch passage connects the air feed passage to the dust suction passage. In a vacuum mode, the change-over valve is pivotally moved to a position for closing an opening of the branch passage, so that the air from the blower is directed to the dust bag by way of the a
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Everts Robert G.
Fujiwara Nobuaki
Kikuchi Naoki
Moore Chris K.
Ryobi Limited
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