Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Reexamination Certificate
2000-12-01
2001-12-04
Moore, Chris K. (Department: 1744)
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
C015S405000, C015S413000
Reexamination Certificate
active
06324721
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a portable leaf blower having a fan unit with a fan and a combustion engine for driving the fan.
2. Description of the Related Art
Engine driven leaf blowers have turned out to be efficient tools for cleaning lawns, pedestrian streets, parking places and the like. Such leaf blowers, however, have the disadvantage that they create a comparatively high noise level that is disturbing for the operator as well as for the environment. For instance, the fan creates noise of such a character that it penetrates walls and closed windows and, hence, is difficult to shut out. For this reason in some areas restrictions have been introduced limiting the use of such motor driven tools. There also are limits for maximum allowable noise level that the currently-used leaf blowers do not fulfil.
Another problem in connection with leaf blowers is that they are often exposed to rough treatment especially under transport, which means that damages might occur for example, to the air filter, carburetor or fuel tank.
SUMMARY OF THE INVENTION
A purpose of the present invention is to minimize or eliminate the aforementioned inconveniences that are found in the prior art, and to achieve a leaf blower which, when compared to such prior-art tools, emits less disturbing noise and also stands rough treatment without the risk for damages. In accordance with the present invention, a leaf blower has a fan unit arranged in a shell, the shell having a lower inlet opening and an upper opening. When the engine and fan are operating, air flows through the lower inlet opening to the fan. When the engine and fan are shut off, air for cooling the engine flows through the shell, from the lower inlet opening to the upper inlet opening, by means of self convection, thereby cooling the engine.
REFERENCES:
patent: 4461055 (1984-07-01), Zerrer et al.
patent: 4663799 (1987-05-01), Kiyooka
patent: 4884314 (1989-12-01), Miner et al.
patent: 5457846 (1995-10-01), Kuwano et al.
patent: 5802133 (1998-09-01), Iida
Aktiebolaget Electrolux
Moore Chris K.
Pearne & Gordon LLP
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