초록 ▼

A shielded vent port for equilization of the pressure on opposed faces of a wall comprises a frame for fitting into an opening in said wall, a conduit through said frame, a sloping plate in said conduit, said plate being sealed against the walls of said conduit and having a large aperture therethrou

A shielded vent port for equilization of the pressure on opposed faces of a wall comprises a frame for fitting into an opening in said wall, a conduit through said frame, a sloping plate in said conduit, said plate being sealed against the walls of said conduit and having a large aperture therethrough, and a riser lying against the upper face of said sloping plate, said riser preventing flow of air in a downward direction through said plate and being movable away from said plate to permit flow therethrough in an upward direction. To provide for flow of air through said wall in either direction, the frame may have two conduits therethrough with a sloping plate and a fitted riser in each, the planes of said plates sloping in opposed directions. The shield may be lifted away from the plate to permit flow of air therethrough by an excess of pressure below the plate or by a solenoid in response to an external signal.

대표청구항 ▼

A pressure-equalization vent port for equalizing the pressure on opposed sides of an enclosure wall, comprising: a frame shaped for fitting an opening in said wall, said frame having a conduit therethrough, said conduit having a top wall, a bottom wall, side walls and open ends; a plate disposed wit

A pressure-equalization vent port for equalizing the pressure on opposed sides of an enclosure wall, comprising: a frame shaped for fitting an opening in said wall, said frame having a conduit therethrough, said conduit having a top wall, a bottom wall, side walls and open ends; a plate disposed within said conduit, the periphery of said plate being sealingly joined to said walls of said conduit to prevent the passage of air between said plate and said walls, said plate being sloped with respect to said top and bottom walls whereby said plate has upper and lower surfaces, said plate having a large aperture therethrough; riser means in sheet-like form disposed against said upper surface of said plate at the periphery of said aperture for preventing flow of air through said aperture in a downward direction; and spindle means disposed for permitting movement of said riser means in a direction essentially perpendicular to the plane of said plate at said aperture and upwardly therefrom for flow of air through said aperture only in said upward direction when the pressure on that end of said conduit proximate said lower surface of said plate is greater than at the other end of said conduit by an amount sufficient to overcome the weight of said riser means, said spindle means being mounted to said port in a direction essentially perpendicular to said plate, said riser means having a closely fitting aperture for passage of said spindle means therethrough and said spindle means having an expanded upper end for limiting the upward excursion of said riser means.