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US 5,671,730 AGranted
Gas mask with electronic blower control
AssigneeKemira Safety Oy
InventorRauno Ollila
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for regulating the rate of air fed into a gas mask, as well as to a gas mask. The power of the gas mask blower is regulated on the basis of the current and rotation speed of the blower. The invention can be applied in any facial parts of breathing masks.
Claims16
A gas mask, comprising:
- a filter;
- a blower having means for feeding air through said filter, said blower including a rotatable blower rotor and an electric motor for driving said blower;
- an electronic control circuit having means for controlling the voltage effective across said motor;
- first means for providing a first signal dependent on the electric current of the motor;
- and
- second means for providing a second signal dependent on the rotational speed of the blower;
- said means for controlling being adapted to receive said first and second signals so as to control the power fed to the motor on the basis of the motor current and blower speed.
4 more elements
Dependencies are inferred from the claim text.