Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1995-08-23
1997-09-09
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15339, 15344, 15412, A47L 928
Patent
active
056642822
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a vacuum cleaner of the kind including a suction fan driven by an electric motor, a suction nozzle connected to the inlet side of the suction fan via a dust container and a flex means provided for the electric power supply of the motor.
The prior art includes vacuum cleaners designed according to a few different philosophies. A common type is the so-called canister vacuum cleaner having the shape of a larger loaf and comprising a suction fan driven by an electric motor. The vacuum cleaner has an inlet opening connected to a suction nozzle via a hose and an extension tube. From the suction nozzle, the air is conducted via the extension tube and the hose into the vacuum cleaner in which the air passes through a filter in the form of a dust container where the dust particles, conveyed by the air, is separated. Then, the air passes through the suction fan and is also led past the motor for the purpose of cooling the same before being let out to the surrounding atmosphere, usually after having passed an additional filter which also acts as a diffusor. When the vacuum cleaner is to be used a person grips a handle provided at the end of the hose turned away from the vacuum cleaner and connecting the hose with the extension tube. In this way the user can move the suction nozzle across the underlying surface and, if needed, the vacuum cleaner, which is provided with wheels, can be moved across the underlying surface by the user pulling the hose.
Another kind of vacuum cleaner is the so-called upright cleaner which comprises a floor unit and a handle part. The floor unit comprises a suction nozzle and, in addition, a rotating brush having a beating effect on soft surfaces, like wall-to-wall carpets. The handle part comprises a larger dust container and also serves as an operating means for controlling the movement of the floor unit across the surface to be cleaned.
The two types of vacuum cleaners referred to above both have considerable weight, of the order of 5-10 kg, and are cumbersome in use due to weight. A particularly difficult situation arises when the vacuum cleaner is to be taken out from or put into a storage cabinet or, for example in a villa, when it is to be moved between two different floors.
On the market there is also a type of vacuum cleaner which to some extent remedies the disadvantage caused by weight. This type of vacuum cleaner, often referred to as a stick vacuum cleaner, is of the same category as the upright cleaner, however, the floor unit comprises a suction nozzle only without any rotating brush and the vacuum cleaner is smaller and also less heavy than the normal upright cleaner. A disadvantage is that for weight reasons the vacuum cleaner is equipped with a smaller motor fan unit causing the vacuum cleaner to be less efficient as compared to the corresponding canister cleaner or upright cleaner.
Based on the stick vacuum cleaner, referred to, the object of the invention is to make this cleaner as efficient as a corresponding vacuum cleaner of the canister type or the upright type and at the same time to reduce the weight even further. In order for this to be achieved it is necessary to focus onto the heaviest unit in the vacuum cleaner, namely the motor fan unit and then, in the first place, the motor.
From turbo units in automobiles it is known that by use of rapidly rotating impellers, small in size, it is possible to introduce under pressure large amounts of air into the intake system of an automotive engine. In this case a high pressure is created by means of the impeller but, of course, a suction force can be created correspondingly. This idea is the basis for the invention, namely that by means of a rapidly rotating impeller, small in size, it would be possible to create a suction effect of the same magnitude as in the vacuum cleaners of the canister or the upright type, respectively, referred to above, however, with reduced dimensions of the suction fan. In this case the impeller is not driven by exhaust gases as in the automobile case but by an
REFERENCES:
patent: 4969797 (1990-11-01), Takara et al.
Castwall Lennart Wilhelm
Lindmark Magnus Carl Wilhelm
Moren Lars Gunnar
Aktiebolaget Electrolux
Moore Chris K.
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