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US 3,942,422 AGranted
Roof ventilator
AssigneeKabushiki Kaisha Suiden
InventorsYuzo Kawai, Hajime Kawai, Ryoyu Hachisu
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AssigneeKabushiki Kaisha Suiden
InventorsYuzo Kawai, Hajime Kawai, Ryoyu Hachisu
Estimating the term…
A roof ventilator comprising a pipe provided with an opening therein, a shutter means adapted to be raised above or lowered over said opening, a supporting arm associated with a rotating shaft which is rotatably disposed within said pipe, a fan means housed in said pipe below said shutter means and attached to said shaft, means for rotating said shaft and the fan associated therewith, said shutter means being supported on said supporting arm by two pairs of foldable arms, each pair of arms being pivotally connected to each other and to the terminating top end portion of said supporting arm at one end and to the shutter means at the other end so that a unitary upward movement of said pairs of foldable arms and said shutter means is achieved by the rotation of the fan means disposed therebelow.
A roof ventilator adapted to be housed in a pipe provided with an opening therein which comprises, a substantially unitary shutter means adapted to extend across the opening in a pipe and to be raised above or lowered over such an opening, a supporting rod connected to a rotating shaft for rotatable disposition within such a pipe, a fan means to be housed in such a pipe below said shutter means and attached to said shaft, means for rotating said shaft and the fan associated therewith, said shutter means being supported on said supporting rod by two pairs of foldable arms, said foldable arms being disposed above said shutter means, each pair of arms being pivotally connected to each other and to a terminating top end portion of said supporting rod at one end and associated with the shutter means at the other end so that upon the rotation of the fan means a unitary upward movement of said pairs of foldable arms is achieved which lifts the shutter means above the end of a pipe.
A roof ventilator adapted to be housed in the opening of a pipe which comprises a shutter means adapted to extend across a pipe opening, a shaft disposed for rotatable disposition in such a pipe, said shaft extending through said shutter means and above and below said shutter means, fan means operatively attached to said shaft below the shutter means, motor means for rotating the shaft and fan means attached thereto, two pairs of foldable arms disposed above said shutter means, each pair of arms being pivotally connected to each other and to a terminating top end portion of the shaft at one end for rotation therewith and associated with the shutter means at the other end, the end portions of each pair of foldable arms which are connected to the top of the shaft being provided with opposing tooth portions, said tooth portions being in engaging relationship with each other so that upon the rotation of the fan, a unitary upward movement of said pairs of said foldable arms and said shutter means if achieved which causes said tooth portions of each of said pairs of foldable arms to rotate in a vertical plane and in opposite directions.
A roof ventilator housed in a pipe provided with an opening therein which comprises in combination;
Dependencies are inferred from the claim text.