Patent ID: 9445574
Filing Date: 2016-09-20
CPC Classification: A01K,F24F

Claim Text:
1. Air inlet for ventilation comprising an upper aperture and a lower aperture joined by a tubular passage defined by surrounding side walls extending between said apertures, said upper aperture having a generally planar edge and said upper aperture being adapted to allow airflow from a corresponding aperture in a substrate, said lower aperture having a planar edge generally parallel to the edge of said upper aperture and locatable below said substrate, said lower aperture having a lid movable between a closed position blocking said passage, and at least one open position allowing air flow through said passage, said tubular passage being generally rectangular in cross section, said side walls forming two pairs of opposed parallel walls connected at their side edges, spaced apart parallel first and second axles extending between one pair of opposed parallel side walls, each axle having two yokes mounted thereon adjacent said side walls, said yokes having first and second arms extending outward at an angle, said other pair of said side walls comprising opposed cross walls parallel to said axles, two upper pull bars substantially parallel to a plane formed by said axles, and said pull bars being joined to said yokes by first pivot pins journalled in said pull bars and said first arms of said yokes, two lower connecting bars aligned substantially perpendicular to said axles, said connecting bars being joined to said yokes by second pivot pins journalled in said connecting bars and said second arms of said yokes, said connecting bars being attached to said lid, said pull bars having a default position wherein said lid is in closed position, said yokes being rotatable from said default position where said arms are generally upward and said pivot pins aligned parallel to said edges of said upper and lower apertures, when said pull bars are displaced from said default position away from said first axle toward said second axle said yokes are angularly rotated away from said default position so said first arms are closer to said edge of said upper aperture and said second arms are closer to the edge of said lower aperture, whereby said lower connecting bars are displaced away from said edge of said upper aperture, and said lid is displaced away from said edge of said lower aperture into an open position, the angle of rotation of said yokes determining the displacement of said lid.