Electric fan
OwnerWen-Tun Leeinventor
Life of this patent
Estimating the term…
Abstract
A fan provided with a smoke detector wired to a CPU in a switch to start the fan if smoke detected exceeds a certain level; and an ion generator is provided to generate ions to neutralize substances carrying hazardous cations; a first conductor on a screen holder wired to the CPU and in off-position state is conducted by contacting a second conductor provided on a front screen so that the fan blades are disabled when both conductors are disconnected once the front screen is removed.
Claims4
An electric fan having provided with a smoke detector provided on the fan to detect level of suspended particles in ambient air and wired to a central control unit (CPU) containing a control line connected to a switch of the fan to automatically activate fan blades to rotate once the level of the suspended particles exceeds a certain degree.
An electric fan comprising an ion generator provided on a screen holder to emit ions to neutralize substances carrying hazardous cations in the air along routes of air circulation achieved by the rotating fan blades.
An electric fan comprising a conductor being connected to a screen holder of the fan and in off-position state;
- the conductor having two contacts extending to an edge of the screen holder;
- a second conductor being provided on a rim of a front screen of the fan to form a conduction passage when both of the conductors contact each other;
- and both of the conductors being disconnected when the front screen is removed and the CPU fails to command the fan blades to operate.
Dependencies are inferred from the claim text.