Fluid sprinkling – spraying – and diffusing – Including supplemental gas shaping or shielding jet – Plural sets of gas jet orifices
Reexamination Certificate
1999-08-31
2001-01-09
Morris, Lesley D. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including supplemental gas shaping or shielding jet
Plural sets of gas jet orifices
C239S300000, C239S412000, C239S417300, C239S424000
Reexamination Certificate
active
06170759
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a method for applying an adhesive to a product surface wherein, by means of a spray head provided with a nozzle body, the adhesive is applied to the product surface to be sprayed as a thin stream of spray in the approximate shape of a spiral, on which at least one air jet acts at the outlet. The invention also relates to a device for executing this method.
BACKGROUND OF THE INVENTION
An arrangement for applying an adhesive to a product surface is known from U.S. Pat. No. 5,065,943, which essentially comprises a spray apparatus and a preparation device for the adhesive functionally connected therewith, as well as an air injection device, which is connected via at least one conduit with a spray head, wherein either a nozzle body, which is embodied in the shape of a disk and fastened by a screw-on cap on the latter, or a cap embodied as a nozzle body, are arranged on the spray head. The nozzle body, which is penetrated by an outlet opening, is provided with several bores, which are distributed in the circumferential direction and are oriented parallel in respect to a frustoconical tip and obliquely in the direction of the exiting thin stream of spray, from each of which an air jet is directed against the exiting thin stream of adhesive spray and the latter is applied in the approximate shape of a spiral to the product surface to be sprayed.
Further, similar arrangements with appropriately embodied spray devices for the spiral-shaped application of a thin stream of adhesive spray to a product surface are known from U.S. Pat. No. 4,969,602, U.S. Re-issued Pat. No. 33,481 and International Patent Publication WO 94/04282, in which the spray head is respectively provided with a nozzle body, which is embodied in the shape of a disk and held by a screw-on cap or the like.
The individual elements of the spray device of the known arrangements, in particular those of the spray head, have a relatively complicated structural design, wherein the nozzle body respectively arranged on and fastened to the spray head and the bores arranged therein has respective production tolerances, which cause an uneven spiral application, and in addition require a fresh time- and cost-consuming readjustment after the nozzle body has been changed.
OBJECT AND SUMMARY OF THE INVENTION
The invention is based on the object of creating a method, as well as a device with a spray head and nozzle body arranged thereon, by means of which a guidance of the adhesive jet can be achieved, which is even and laterally exactly limited in relation to the respective application surface to be sprayed.
Regarding the method, this object is attained in that, for the spiral-shaped delivery and application on the product surface, the thin stream of adhesive spray exiting the spray head is acted upon by at least one air jet, which is accelerated by means of convergent-divergent means of the nozzle body.
The device for executing the method is distinguished in that for obtaining an air jet which exits in an accelerated manner and is directed onto the thin stream of adhesive spray, an air nozzle with an interior chamber which is designed to be convergent-divergent in the flow-through direction, can be respectively inserted into bores of the nozzle body, which bores are charged with air via an associated air conduit, or that the interior chamber of the single bore, which is oriented in the flow-through direction, is designed to be convergent-divergent.
Further characteristics of the invention ensue from the following description in connection with the individual claims and the drawings.
The invention will be described in what follows in connection with the exemplary embodiments represented in the drawings.
REFERENCES:
patent: Re. 33481 (1990-12-01), Ziecker et al.
patent: 4969602 (1990-11-01), Scholl
patent: 5065943 (1991-11-01), Boger et al.
patent: 5431343 (1995-07-01), Kubiak et al.
patent: 9404282 (1994-03-01), None
Browdy & Neimark
Morris Lesley D.
Robatech AG
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