Title: Vacuum cleaner and temperature-responsive motor cooling device

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Claims: What is claimed is:

1. A temperature-responsive vacuum cleaner motor cooling device comprising a vacuum cleaner housing having a first and second compartments at least one fan driven by the vacuum cleaner motor, a dust container, communicating with an inlet the latter together with said motor and fan being located within said housing, said fan when operating functioning to transport air through said compartments while the dust is separated out in said dust container, a temperature sensing means for and adjacent said motor, a valve having a valve body normally covering an opening in said housing and comprising a chamber provided with a diaphragm, one part of said chamber on one side of said diaphragm having an opening communicating with said first compartment in a first space being located between said dust container and the suction side of said fan, an air conduit connecting said one part of said chamber on said one side of the diaphragm to said second compartment downstream of the fan and having a higher pressure and housing said motor, and a blocking means associated with said air conduit and said temperature responsive means being acted upon by said temperature sensing means when the motor temperature is too high to open said valve and thereby establish communication between the atmosphere and said first space and said motor whereby cooling air is permitted to flow about said motor.

2. A device as claimed in claim 1 wherein said temperature sensing means is a bimetallic spring.

3. A device as claimed in claim 1 wherein said valve is provided with an upstanding rod, said valve body being connected to said rod at the free end thereof, the other end of said rod being connected to said diaphragm, a spring acting against said valve body to normally urge the same to cover the opening in said housing, and when said diaphragm is moved in a predetermined direction against the spring bias said opening is uncovered.

4. A device as claimed in claim 1 further providing the other part of said chamber located on the other side of said diaphragm, and a hole in said other part communicating with said first space.

5. A device as claimed in claim 1 wherein said one part of the chamber is provided with an upper portion that has peripheral apertures for the passage of atmospheric air flowing through the opening in said housing to the space adjacent to the outside of said dust container and further to the suction side of said fan.

6. A device as claimed in claim 5 wherein said chamber is further provided with a partition having an opening therethrough separating said upper portion from said one part of said chamber, an upstanding rod provided with a valve body at the free end thereof, and means normally urging said valve body to a position to cover said opening in the housing, said rod passing through the opening in said partition.

Other info:

Inventors: Asplund, Ivar (Solna, SW)
Waara, Karl Arvid Henning (Stockholm, SW)

Application Number: 553540
Filing Date: 1975-02-27
Publication_date: 1976-02-03
Assignee: Aktiebolaget Electrolux (Stockholm, SW)
Primary Class(es): 96/407 15/319, 236/87
Other Classes:
US Patent Ref:

2933257	Apr, 1960	Clark	236/80.
3232030	Feb, 1966	Owenmark	55/217.

Other Refs:
Primary Examiner: Nozick, Bernard
Assistant Examiner:
Attorney: Miller; Alfred E.