Low cost dispenser for multi-component foams
First Claim
1. A gun assembly for mixing and dispensing reactive liquid components and directing a gas for propelling said mixed components to an application site, said gun assembly including, in combination, a valve body, a nozzle positioning portion, and a mixing and dispensing nozzle including nozzle inlets for liquid and gas, said valve body including at least one liquid inlet, at least one liquid outlet, a gas inlet and a gas outlet, said liquid and gas outlets in said valve body and said liquid and gas inlets on said nozzle being respectively constructed and arranged for registry and cooperative axial insertion and removal without nozzle rotation, a liquid valve mechanism positioned within said body between said at least one liquid inlet and said at least one liquid outlet, a gas valve mechanism positioned within said body between said gas inlet and said gas outlet, a trigger having an operative connection to both said liquid valve mechanism and said gas valve mechanism, with said trigger being constructed and arranged so as to permit liquid and gas to flow through said liquid and gas valve mechanisms respectively when both valve mechanisms are fully open, and to open said gas valve mechanism only after said liquid valve mechanism is at least partially open.
1 Assignment
0 Petitions
Accused Products
Abstract
A mixing and dispensing gun with a valve body containing a pair of liquid inlets, a pair of separate liquid outlets, a gas outlet and a removable mixing and dispensing nozzle. The nozzle contains the ingredients while they are being mixed and a gas outlet is positioned within the nozzle so as to propel the mixed ingredients to the application area. The nozzles and gun body include cooperating inlet and outlet ports such as nipples and recesses to permit alignment and sealing when the nozzle is positioned for use. The gas valve is arranged so that it may be operated simultaneously or in sequence with the liquid valves.
79 Citations
13 Claims
- 1. A gun assembly for mixing and dispensing reactive liquid components and directing a gas for propelling said mixed components to an application site, said gun assembly including, in combination, a valve body, a nozzle positioning portion, and a mixing and dispensing nozzle including nozzle inlets for liquid and gas, said valve body including at least one liquid inlet, at least one liquid outlet, a gas inlet and a gas outlet, said liquid and gas outlets in said valve body and said liquid and gas inlets on said nozzle being respectively constructed and arranged for registry and cooperative axial insertion and removal without nozzle rotation, a liquid valve mechanism positioned within said body between said at least one liquid inlet and said at least one liquid outlet, a gas valve mechanism positioned within said body between said gas inlet and said gas outlet, a trigger having an operative connection to both said liquid valve mechanism and said gas valve mechanism, with said trigger being constructed and arranged so as to permit liquid and gas to flow through said liquid and gas valve mechanisms respectively when both valve mechanisms are fully open, and to open said gas valve mechanism only after said liquid valve mechanism is at least partially open.
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11. A gun assembly for mixing and dispensing reactive liquid components and a propellant gas, said gun assembly including a valve body including a handle portion, an end face and sidewall sections combining to define a recess for receiving a removable nozzle, said valve body also including a pair of liquid inlets adapted to register with the end portions of hoses for connection to a supply of reactive liquids, liquid outlets terminating in enlarged openings at said end face of said valve body, a gas passageway having an inlet for attachment to the end portion of a gas supply hose and an outlet portion adapted to cooperate with a portion of said nozzle, a liquid flow control valve positioned within said valve body and movable between open, closed and a series of intermediate positions whereby the rate of liquid flow therethrough may be varied by varying the position of said liquid valve, and a gas valve having enlarged and reduced diameter portions and including communicating axial and radial passages therein, said radial passage lying between said enlarged and reduced diameter surfaces, with said gas valve being reciprocable in said gas passageway so as to withdraw said reduced diameter portion of said gas valve from said reduced diameter passage to permit gas flow therethrough, and with said gun assembly further including a trigger operatively connected to both said liquid valve and said gas valve, and with said liquid and gas valves being arranged such that either liquid or gas flow may be initiated at any time relative to each other.
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12. In a mixing and dispensing gun of the type having a gun body with at least two liquid inlet passages and two liquid outlet passages, a trigger, at least one trigger-operated valve for controlling liquid flow through said passages, a mixing and dispensing nozzle wherein said two liquids are mixed, said nozzle having two inlet passages and surfaces creating a liquid-tight seal with cooperating portions of said liquid outlet passages in said gun body to prevent leakage between said gun body liquid outlet passages and said nozzle liquid inlet passages, the improvement comprising additionally providing a gas inlet and a gas outlet in said body, and a separate gas valve actuated by said trigger that actuates said valve for controlling liquid flow, said valves being constructed and arranged such that either said gas valve or said liquid valve may open in any sequence in relation to each other, and said nozzle having a gas inlet registrable with said gas outlet in said body, and said nozzle being arranged relative to said body so that cooperating surfaces on said body gas outlet and said nozzle gas inlet are registered with one another in a single position.
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13. In a mixing and dispensing gun of the type having a valve body and a pair of liquid inlets, a pair of liquid outlets, and a trigger operated valve for controlling flow of liquid through said inlets and outlets, the improvement comprising additionally providing a gas inlet and a gas outlet, and a gas valve for controlling gas flow through said gas inlet and gas outlet, and a mixing and dispensing nozzle having an enlarged diameter interior mixing space, separate liquid inlets leading to said mixing space, a baffle disposed in said mixing space and a nozzle outlet portion of reduced diameter relative to said mixing space, a gas passage tube extending through said mixing space and terminating in the region of an annular space lying between said reduced diameter nozzle outlet portion and the exterior of said gas passage tube.
Specification