Vehicle cab ventilator

Claim 2

A ventilator unit adapted for mounting on the roof of a vehicle cab having enclosing side wall portions, said unit comprising in combination: a horizontally elongated casing, said casing having an ambient inlet opening adjacent one end thereof and an air outlet opening through a bottom wall of said casing adjacent in opposite end thereof; means to mount said casing on said roof exteriorally of said cab, said roof having an opening in alignment with said air outlet opening; a deflector plate; means to suspend said deflector plate from said roof immediately below said aligned openings, said deflector plate being upwardly convex and having marginal edge portions thereof spaced from said cab side wall portions; filter means arranged within said casing; and fan means arranged within said casing for drawing air successively through said inlet opening and said filter means and discharging air passing from said filter means vertically downwardly through said aligned openings against said deflector plate, said deflector plate cooperating with said roof to define a plenum chamber for receiving air passing through said aligned openings and outlets through which air is directed from said chamber towards said side wall portions of said cab for distribution within said cab.

Claim 3

A ventilator unit according to claim 1, wherein said fan means includes a fan casing, said fan casing having an outlet duct extending downwardly through said aligned openings in air sealed relationship relative to said casing bottom wall and said roof.

Claim 4

A ventilator unit adapted for mounting on the roof of a vehicle cab comprising in combination: a horizontally elongated casing, said casing having an ambient inlet opening adjacent one end thereof and an air outlet opening through a bottom wall of said casing adjacent an opposite end thereof; means to mount said casing on said roof exteriorally of said cab, said casing mounting means including a pair of L-shaped brackets fixed one bracket adjacent each side of said casing, each said bracket having a plurality of fastener device receiving apertures arranged for alignment with fastener device receiving apertures in said roof, said roof having an opening in alignment with said air outlet opening; a deflector plate; means to suspend said deflector plate from said roof immediately below said aligned openings, said deflector plate suspending means including plural pairs of brackets fixed to said deflector plate and having apertures arranged for alignment with certain of said aligned apertures, said casing being fixed to said roof by fastener devices passing downwardly through other of said aligned apertures and by fastener devices passing downwardly through said certain aligned apertures and said plate mounting bracket apertures, filter means arranged within said casing; and fan means arranged within said casing for drawing air successively through said inlet opening and said filter means and discharging air passing from said filter means downwardly into said cab thRough said aligned openings against said deflector plate, said deflector plate cooperating with said roof to define a plenum chamber from which air is distributed within said cab.

Claim 5

A ventilator unit adapted for mounting on the roof of a vehicle cab comprising in combination: a horizontally elongated casing, said casing having an ambient inlet opening adjacent one end thereof and an air outlet opening through a bottom wall of said casing adjacent an opposite end thereof; means to mount said casing on said roof exteriorally of said cab, said casing mounting means including a pair of L-shaped brackets fixed one bracket adjacent each side of said casing, each said bracket having a plurality of fastener device receiving apertures arranged for alignment with fastener device receiving apertures in said roof, said roof having an opening in alignment with said air outlet opening; a deflector plate; means to suspend said deflector plate from said roof immediately below said aligned openings, said deflector plate suspending means including plural pairs of brackets fixed to said deflector plate and having apertures arranged for alignment with certain of said aligned apertures, said casing being fixed to said roof by fastener devices passing downwardly through other of said aligned apertures and by fastener devices passing downwardly through said certain aligned apertures and said plate mounting bracket apertures, filter means arranged within said casing; and fan means arranged within said casing for drawing air successively through said inlet opening and said filter means and discharging air passing from said filter means downwardly into said cab thRough said aligned openings against said deflector plate, said deflector plate cooperating with said roof to define a plenum chamber from which air is distributed within said cab.

Claim 6

A ventilator unit adapted for mounting on the roof of a vehicle cab comprising in combination: a horizontally elongated casing of generally rectangular cross-sectional configuration having a pair of end walls, a pair of side walls and top and bottom walls, one of said end walls defining an ambient inlet opening, said bottom wall defining an air outlet opening arranged adjacent another of said end walls, and said top wall defining an expansive access opening sealably closed by a removable top panel; means to mount said casing on said roof exteriorally of said cab, said roof having an opening in alignment with said air outlet opening; a deflector plate; means to suspend said deflector plate from said roof immediately below said aligned openings; filter means removably supported within said casing horizontally intermediate said inlet and outlet openings for removal through said expansive opening; and fan means arranged within said casing, said fan means including a fan casing having an outlet duct extending downwardly through said aligned openings in an air sealed relationship relative to said casing bottom wall and said roof, said fan means drawing air horizontally successively through said inlet opening and said filter means and discharging air passing from said filter means vertically downwardly through said cut into said cab against said deflector plate, and said deflector plate cooperating with said roof to define a plenum chamber from which air is distributed within said cab.

Claim 7

A ventilator unit adapted for mounting on the roof of a vehicle cab comprising in combination: a horizontally elongated casing of generally rectangular cross-sectional configuration having a pair of end walls, a pair of side walls and top and bottom walls, one of said end walls defining an ambient inlet opening, said bottom wall defining an air outlet opening arranged adjacent another of said end walls, and said top wall defining an expansive access opening sealably closed by a removable top panel; means to mount said casing on said roof exteriorally of said cab, said roof having an opening in alignment with said air outlet opening; a deflector plate; means to suspend said deflector plate from said roof immediately below said aligned openings; filter means removably supported within said casing horizontally intermediate said inlet and outlet openings for removal through said expansive opening; and fan means arranged within said casing, said fan means including a fan casing having an outlet duct extending downwardly through said aligned openings in an air sealed relationship relative to said casing bottom wall and said roof, said fan means drawing air horizontally successively through said inlet opening and said filter means and discharging air passing from said filter means vertically downwardly through said cut into said cab against said deflector plate, and said deflector plate cooperating with said roof to define a plenum chamber from which air is distributed within said cab.

Claim 8

A ventilator unit according to claim 4, wherein said filter means includes a prefilter pad formed of fibrous materials, a plurality of fiber bags, and an activated charcoal filter, said pad, said bags and said charcoal filter being serially arranged within said casing.

Claim 9

A ventilator unit adapted for mounting on the roof of a vehicle cab having enclosing side wall portions, said unit comprising in combination: a horizontally elongated casing, said casing having an ambient inlet opening defined by one screened end wall thereof, an air outlet opening through a bottom wall of said casing adjacent an opposite end wall thereof, an expansive access opening in a top wall thereof, said access opening being sealably closed by a removable top panel; means to mount said casing on said roof exteriorally of said cab, said casing mounting means including a pair of L-shaped brackets fixed one bracket adjacent each side of said casing, each said bracket having a plurality of fastener device receiving apertures arranged for alignment with fastener device receiving apertures in said roof, said roof having an opening in alignment with said air outlet opening; a deflector plate conforming to the contour of said roof and having marginal edges thereof spaced inwardly from said cab side wall portions; means to suspend said deflector plate from said roof immediately below said aligned openings, said deflector plate suspending means including a plurality of pairs of brackets fixed to said deflector plate and having apertures arranged for alignment with certain of said aligned apertures, said casing being fixed to said roof by fastener devices passing downwardly through other of said aligned apertures and by fastener devices passing downwardly through said certain aligned openings and said plate mounting bracket apertures; filter means arranged within said casing for removal through said access opening; and fan means arranged within said casing for drawing air horizontally successively through said inlet opening and said filter means and discharging air passing from said filter means vertically downwardly through said aligned openings against said deflector plate, said deflector plate cooperating with said roof to define a plenum chamber receiving air passing through said alignEd openings and outlets through which air is directed from said chamber towards said cab side wall portions.

Claim 10

A ventilator unit adapted for mounting on the roof of a vehicle cab having enclosing side wall portions, said unit comprising in combination: a horizontally elongated casing, said casing having an ambient inlet opening defined by one screened end wall thereof, an air outlet opening through a bottom wall of said casing adjacent an opposite end wall thereof, an expansive access opening in a top wall thereof, said access opening being sealably closed by a removable top panel; means to mount said casing on said roof exteriorally of said cab, said casing mounting means including a pair of L-shaped brackets fixed one bracket adjacent each side of said casing, each said bracket having a plurality of fastener device receiving apertures arranged for alignment with fastener device receiving apertures in said roof, said roof having an opening in alignment with said air outlet opening; a deflector plate conforming to the contour of said roof and having marginal edges thereof spaced inwardly from said cab side wall portions; means to suspend said deflector plate from said roof immediately below said aligned openings, said deflector plate suspending means including a plurality of pairs of brackets fixed to said deflector plate and having apertures arranged for alignment with certain of said aligned apertures, said casing being fixed to said roof by fastener devices passing downwardly through other of said aligned apertures and by fastener devices passing downwardly through said certain aligned openings and said plate mounting bracket apertures; filter means arranged within said casing for removal through said access opening; and fan means arranged within said casing for drawing air horizontally successively through said inlet opening and said filter means and discharging air passing from said filter means vertically downwardly through said aligned openings against said deflector plate, said deflector plate cooperating with said roof to define a plenum chamber receiving air passing through said alignEd openings and outlets through which air is directed from said chamber towards said cab side wall portions.