Vacuum relief and access door assembly
AssigneeRuskin Manufacturing Company
InventorGordon Kasper
Life of this patent
Estimating the term…
Abstract
A vacuum relief and access door assembly, for use on a duct downstream of a fire or control dampers, comprises a frame including a duct facing surface with a seal member thereon, a closure member having side edges in sealing engagement with the seal member, and cooperative retaining members mounted on the frame and closure member and resiliently urging the closure member into sealing engagement with the seal member, yielding to allow the closure member to displace toward the duct to allow air flow thereby for vacuum relief and returning into sealing engagement with the seal member said retaining members being releasable for removal of said closure member.
Claims11
A vacuum relief and access door assembly for use on a duct having an access opening in a wall thereof, comprising:
- (a) a door mounting frame sealingly attached to a duct wall and defining a door opening communicating with a duct;
- said frame having abutment portions with edges spaced outwardly from the frame away from the duct and rear surfaces facing laterally outward from the door opening;
- (b) sealing means mounted on said door frame and facing said duct;
- (c) an access door for positioning on the duct side of the door frame;
- and
- (d) mounting means for releasably mounting the access door on the duct side of the door frame in sealing engagement with said sealing means, said mounting means comprising at least two flat spiral coil springs on opposite sides of the door opening and with end portions secured relative to the door and coils having a plurality of convolutions releasably engaged over the edges of the abutment portions and with said rear surfaces, and operable to pay out said springs from the coils in response to negative pressure in said duct to permit said access door to temporarily displace from said seating engagement for relief of said negative pressure and return into sealing engagement.
A vacuum relief and access door assembly for use on a duct having an access opening in a wall thereof, comprising:
- (a) a door mounting frame sealingly attached to a duct wall surrounding the borders of an access opening, said frame including a closure retaining flange having a surface facing said duct;
- (b) an access door having one side facing said duct and having a peripheral edge portion facing said facing surface of the retaining flange;
- (c) a resilient peripheral seal member on one of said retaining flange surface and said peripheral edge portion of the access door;
- (d) at least two guide members in spaced apart opposed positions on one of the frame and access door;
- and
- (e) a flat spiral spring for each guide member, said flat spiral springs each having a coil of a plurality of convolutions engaged with a respective guide member and a portion extending therefrom with an end secured relative to the other of said frame and closure member said spiral springs being operable to bias the access door into sealing engagement and in response to negative pressure in said duct to permit said access door to temporarily displace from said sealing engagement for relief of said negative pressure and to return into sealing engagement.
Dependencies are inferred from the claim text.