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US 6,386,826 B1Granted
Fan with self closing blades
AssigneeInternational Business Machines Corporation
InventorFrancois Jacob
Life of this patent
Estimating the term…
Abstract
A fan system to be mounted over an opening including a plurality of pivoting blades fixed on a free wheeling element and a motor driven element wherein, in operation, when the fan is operating the motor driven element pivots the blades to a blowing position allowing air flow through the opening, and when the fan is not operating a resilient member pivots the blades to a closed position preventing air flow through the opening.
Claims14
A fan system comprising at least one fan to be mounted over an opening comprising:
- a central rotating element (30);
- a plurality of pivoting blades (20) fixed on the central rotating element (30);
- means for automatically closing the opening with the surface of the blades when the fan is stopped comprising means for pivoting each blade (20) around an axis fixed on said central rotating element (30) from an open to a closed position;
- and
- means for automatically placing blades in a blowing position when the fan is running comprising means for pivoting each blade (20) around an axis fixed on said central rotating element (30) from a closed position to a blowing position.
2 more elements
A fan system comprising at least one fan to be mounted over an opening comprising:
- a motor driven element (40) having first stops (70);
- a free wheeling element (30);
- a plurality of pivoting blades (20) fixed on the free wheeling element (30);
- and
- resilient members (10) fixed on the free wheeling element (30);
- wherein, in operation, when the fan is operating and motor driven element (40) is engaged, first stops (70) push said pivoting blades to a first, blowing position and when the fan is not operating, said resilient members (10) push said pivoting blades (20) to a second, closed position.
3 more elements
Dependencies are inferred from the claim text.