Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1984-10-10
1986-09-16
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15412, 15377, A47L 928
Patent
active
046113657
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a vacuum cleaner comprising a casing including a suction fan, a suction motor and a floor nozzle having a motor-driven rotary brush, and a hose and a pipe coupling the nozzle to the suction side of the casing.
TECHNOLOGICAL BACKGROUND
In conventional vacuum cleaners of the type comprising a casing coupled by a hose to a floor nozzle having a rotary brush driven by a motor therein, it is required that power feed lines be led from the casing to the brush motor encased in the floor nozzle.
One current method involves helically winding the feed lines around the hose. However, this results in a hose having reduced flexibility, making it difficulty to operate the floor nozzle.
Another current method utilizes the pair of metal wires which are currently employed to maintain rigidity of the hose as a means for carrying the current to the brush motor. Vacuum cleaners of this type are usually provided at the end of the hose with a device that remotely controls the speed of the suction motor via the reinforcing wires. If such wires are used for brush motor control, no remote control would be possible for the suction motor. One approach would be to provide two pairs of reinforcing wires, the first pair for carrying the current to the brush motor and the second pair for carrying the control current to the suction motor. However, this will result in a loss of flexiblity and ease operation of the hose, difficulty in manufacture, and a high production cost, and in addition, this will require a complex coupling arrangement which connects the reinforcing wires to motor control circuitry, resulting in a bulky cleaner.
DISCLOSURE OF THE INVENTION
According to the present invention, a signal is applied to a pair of wires that run along a hose for carrying the current to a brush motor such that the speed of a suction motor is controlled by the applied signal.
Embodiments of the present invention will now be described with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings show embodiments of the present invention.
FIG. 1 is a perspective view of an embodiment of the vacuum cleaner of the invention;
FIG. 2 is a block diagram;
FIG. 3 is a block diagram showing a whole circuit;
FIGS. 4a to 4g show waveforms;
FIGS. 5 and 6 are circuit diagrams showing a signal generating section and a signal detecting section respectively;
FIG. 7 is a circuit diagram showing another embodiment of the invention;
FIG. 8 is a circuit diagram showing yet another embodiment of the invention; and
FIG. 9 is a circuit diagram showing a signal generating section and a signal detecting section of FIG. 8.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Designated at numeral 1 in FIG. 1 is a casing housing a fan driven by a suction motor, a filter arranged at the suction side of the motor, an electrical control unit described hereinafter. The casing 1 has rollers 2 at the bottom portion thereof for it to be easily moved on a surface being cleaned, such as a carpet. A floor nozzle 3 has a rotary brush driven by a motor therein, and a suction passage 4 provides communication between the casing 1 and the floor nozzle 3. Suction passage 4 comprises a flexible hose 5, a pipe 6 which is adjustable in length, and a hand-grip portion 7 connected between hose 5 and pipe 6. Hand-grip portion 7 is integrally connected to the hose 5, and the pipe 6 is detachably connected opposite ends to floor nozzle 3 and hand-grip portion 7. Flexible hose 5 is detachably connected to the suction port of casing 1.
Power is supplied from the casing 1 to a brush motor which is housed in floor nozzle 3, through a plug 8 and through a pair of metal wires helically embedded in hose 5 and, further, through a two-wire cord 9. A remote control device 10 applies a signal to the two metal wires of cord 9 for controlling the speed of the suction motor and which is provided on hand-grip portion 7. An indicator 11 is provided at the upper surface of casing 1 for indicating the operating condition of the
REFERENCES:
patent: 3579706 (1971-05-01), Hetland
patent: 3855665 (1974-12-01), Schwartz
patent: 4357729 (1982-11-01), Vander Molen et al.
Ishino Yasuo
Komatsu Takashi
Matsushita Electric - Industrial Co., Ltd.
Moore Chris K.
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