Fire resistant, sound attenuating, drop seal door

Claim 1

A solid, fire resistant sound attenuating, drop seal door which comprises in combination: a. a solid, sound attenuating door, having an elongated slot, wholly embedded in the bottom rail thereof; b. an elongated generally U-shaped cover to fit snugly within said slot; c. an elongated gasket support movably positioned within said cover; d. an extension secured to the gasket support and extending beyond the inner stile of the door; e. a plurality of parallelogram shaped wedges disposed in two series positioned within said cover, a first series of wedges having wedge elements spaced apart and rigidly affixed to said cover, a second series of wedges having wedge elements alternately spaced between the elements of the first series and rigidly affixed to said gasket support, all of said wedge elements formed with confronting plane cam faces in a manner that when the extension is moved in a horizontal direction by contact with the inner door jamb, the second series of wedge elements and gasket support will move downwardly with respect to said first series of wedge elements and the rectangular cover; and f. a horizontally disposed tension means coupled between the first and second series of wedge elements for raising the gasket support when the door is opened; said confronting cam faces being so disposed that the cam faces at one end of said wedge elements serve to cam the gasket support downwardly against the bias of the horizontally disposed tension means, and the cam faces on the opposite ends of said wedge elements serve to cam the gasket support upwardly under the influence of the horizontally disposed tension means.