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US 5,683,544 AGranted
Adhesive foam gun
OwnerVolker Koppinventor
Life of this patent
Estimating the term…
Abstract
There are adhesive foams that are formulated for gun uses and adhesive foams that are formulated for adapter use. This means a double track in production, storage and use of adapter foams. The invention is a gun version that permits use of adhesive foams such as used in the adapter version. For this purpose, the needle and the nozzle tube in the gun have a shape such that the nozzle tube has at least one mixing path, and the amount of foam can be sensitively metered by means of narrowings and widenings between the inner wall of the nozzle tube and the outer wall of the needle.
Claims19
A gun for the production of adhesive foams, comprising:
- a discharge lever,
- a nozzle tube having an end region,
- a nozzle needle in and coaxial with said nozzle tube and having an end region with a cone,
- urging means for urging said nozzle needle into a closing position in said nozzle tube,
- coupling means for coupling said discharge lever and said nozzle needle, by means of which coupling a given position of said discharge lever corresponds to a given position of said nozzle needle,
- means for providing an at least liquid-tight, conical seat between said end region of said nozzle needle and said end region of said nozzle tube when said discharge lever is not actuated,
- a cavity between said nozzle needle and said nozzle tube,
- said nozzle tube having three coaxial, circular cylindrical bores including said cavity, the diameters of said three coaxial, circular cylindrical bores successively decreasing in size in a down-stream direction towards said end region of said nozzle tube,
- said nozzle tube having a narrowing tapered cone between a first bore and a second bore of said three coaxial, circular cylindrical bores, and a narrowing tapered cone between said second bore and a third bore of said three coaxial, circular cylindrical bores,
- said nozzle needle having a first circular, cylindrical region adjacent said end region of said nozzle needle, said first circular, cylindrical region being seated in said third bore of said three coaxial circular, cylindrical bores in said closing position with very small play when said discharge lever is not actuated,
- said nozzle needle having a cone and a second circular, cylindrical region up-stream of said first circular, cylindrical region, at least part of said second circular, cylindrical region being seated in said closing position in said second coaxial, circular, cylindrical bore when said discharge lever is not actuated,
- said nozzle needle forming a mixing and reaction path with said nozzle tube with a cross-section that decreases successively in said down-stream direction for generating adhesive foams upon actuation of said discharge lever.
9 more elements
Dependencies are inferred from the claim text.