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US 4,452,129 AGranted
Spring-rodless hingeless ventilator
OwnerTimothy A. Kelley, Pamela K. Matherinventors
Life of this patent
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OwnerTimothy A. Kelley, Pamela K. Matherinventors
Estimating the term…
A hingeless ventilator having a frame attachable to a wall of a compartment about an opening therein, a closure member swingable against a side of the frame for opening and closing the opening, guide members fixed to and instanding from an opposite side of the frame beyond opposite ends of the wall opening, and arms fixed to the closure member adjacent opposite ends thereof and instanding therefrom through the wall opening and a screen plate integral with the frame and screening the opening, in which the arms mount on oppositely projecting stub axles a pair of rollers each riding on a guide surface of the adjoining guide member and having for engaging that surface an elastomeric collar, and compression of the collars of the pair of rollers against the guide surfaces provides through the arms of the closure member the tensile force for holding the closure member against and in any selected position relative to the frame when swung to that position by a handle connecting and reinforcing the end portions of the arms.
A hingeless ventilator for ventilating a compartment through an aperture in a wall thereof, comprising a frame attachable to said wall about said aperture and having a central opening for passing air through said aperture, a closure member swingable against a side of said frame for opening and closing said opening, guide means fixed to and instanding from an opposite side of said frame beyond said opening, arms means fixed to said closure member adjacent opposite ends thereof and instanding therefrom through said opening, and means for applying to said closure member through said arm means a tensile force holding said member against and in selected positions relative to said frame, said force applying means consisting of elastomeric roller means mounted on said arm means and therethrough connected to and swingable with said closure member and riding on and compressed against said guide means.
Dependencies are inferred from the claim text.