Adjustable foaming chamber stem for foam-applying nozzle
AssigneeCCA Inc.
InventorLeslie P. Williams
Life of this patent
Estimating the term…
Abstract
A quickly adjustable foaming chamber stem for a foam-applying fire-fighting nozzle wherein the fire-fighter can quickly switch from applying on optimum foam to a stream with an optimum throw. The stem is comprised of a deflector plate and a mixing plate that define a foaming chamber there between, the deflector plate having ducts that, when open, communicate a portion of the liquid and foam-stabilizing concentrate into the chamber to form a foam. The foaming chamber, maintained at approximately atmospheric pressure, forms a small homogeneously bubbled maximum foam through liquid from the ducts striking and reflecting from the mixing plate, causing thereby turbulence and agitation. Surface portions of the mixing plate are inclined to maximize agitation.
Claims13
An adjustable foaming chamber stem for attachment to a foam-applying nozzle having a bore through which pass liquid and a stabilizer, comprising:
- a deflector plate adapted to be affixed to the nozzle approximate the discharge end of the bore such that the plate restricts the flow of liquid discharged, the plate having a plurality of ducts that communicate through the plate in the direction of flow, at least some of the ducts being adjustable between an opened and a closed position;
- a mixing plate affixed to and separated from the deflector plate such that some liquid flowing through the ducts strikes the mixing plate, the two plates forming a foaming chamber between them wherein the orientation of portions of the surface of the mixing plate is coordinated with the direction of flow of liquid from some of the ducts such that some liquid striking the mixing plate is reflected toward the center area of the mixing chamber;
- means for opening and closing at least some ducts;
- and
- means for attaching the stem to the foam-applying nozzle.
Dependencies are inferred from the claim text.