Patent ID: 9566844
Date: 2017-02-14
CPC Classifications: B60H

Claim:
1. A ventilation controlling apparatus, comprising: a casing for forming a sealable first air passage, an additional sealable first air passage, and at least one sealable second air passage, said first air passage and said second air passage being separated from each other by a first partition wall, and said additional first air passage and said second air passage being separated from each other by a second partition wall; a first door attached to a rotatable first shaft and arranged so as to be movable between a door stop position in which said first air passage is closed and at least one door open position; an additional first door attached to said rotatable first shaft and arranged so as to be movable between a door stop position in which said additional first air passage is closed and at least one door open position; a second door attached to a rotatable second shaft and arranged so as to be movable between a door stop position in which said second air passage is closed and at least one door open position, the second door disposed between said first door and said additional first door in a central region of said casing; a drive element attached to said first shaft; and a mechanical link comprising a cam and a pin engaged in said cam, said mechanical link configured to cause an angle of said second shaft to be a function of an angle of said first shaft such that said second door remains in its respective door stop position as long as said first door and said additional first door have an angle ranging from their respective door stop positions to a predefined aperture angle, and such that said second door opens when said first door and said additional first door have an angle exceeding said predefined aperture angle, wherein said first door and said additional first door have a same angle and a same door stop position, wherein said first door and said additional first door exceed said predefined aperture angle, said first door, said additional first door, and said second door move dependently of each other, and wherein said predefined aperture angle equals 18°.