Fluid sprinkling – spraying – and diffusing – Including supply holder for material – Fluid pressure discharge means
Patent
1997-05-13
1999-03-02
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including supply holder for material
Fluid pressure discharge means
239302, 239346, 239377, 239DIG14, B05B 730
Patent
active
058759719
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a spray gun having a handle part and a housing having a connecting part for a pressure can, said connecting part being provided with a check valve, said housing receiving a nozzle pipe bearing a nozzle at the free end, into which pipe a spring-loaded nozzle needle acting upon the opening of the nozzle extends, said needle being operable via a pivoted lever mounted on the housing. Such a spray gun is suitable in particular for discharging plastic sealing foams, for example polyurethane foams.
DE 37 10 395 A1 discloses such a spray gun. The connecting part is connected integrally and firmly with the housing, thereby fixing the position of the pressure can invariably relative to the handle part on the housing. Depending on the type of medium in the pressure can, it may be necessary for the pressure can to assume an angular alignment to the horizontal. The space conditions at the place of use of the spray gun also sometimes make it necessary for the pressure can to assume a different position relative to the handle part since firm alignment prevents optimal handling of the spray gun. Via the handle part the slanted pressure can furthermore causes a tilting moment on the wrist which causes a strain thereon and sometimes also necessitates support by the second hand.
The invention is based on the problem of providing a spray gun of the abovementioned type which permits the position of the pressure can to be adjusted relative to the handle part while the spray gun still has a simple structure.
This problem is solved according to the invention in that the housing part bearing the connecting part for the pressure can is adapted to be rotated around the axis of the nozzle needle relative to the housing part bearing the handle part.
This measure permits the position of the pressure can to be adapted quickly to the necessary conditions, thereby guaranteeing quick work with minimal strain on the user.
Obviously the rotatability of the housing part bearing the connecting part relative to the housing part bearing the handle part is limited in so far as a certain expenditure of force is required to change the position. This is obtained for example by frictionally engaged bracing of the housing part bearing the connecting part on the housing part bearing the handle part, or by the formation of snap-in positions.
According to an advantageous embodiment of the invention, the housing part bearing the connecting part has a projection having a snap ring and inserted into a bore of the housing part bearing the handle part, the snap ring disposed in a groove in the projection jumping up behind a shoulder of the housing part bearing the handle part, thereby fixing the housing parts axially. This assembly ensures that the housing parts are joined in a precisely fitting and simple way, with only the necessary degrees of freedom of the housing parts relative to each other being present.
If the nozzle pipe is clogged the performance of the spray gun must be restored. For this purpose the nozzle pipe must be easily dismantled and then cleaned or replaced in a simple manner. This is obtained according to an advantageous development of the invention if the housing part bearing the connecting part is penetrated by the nozzle needle, has on its side opposite the projection a receiving apparatus for the nozzle pipe and bears a union nut for bracing the nozzle pipe on the housing part.
According to an advantageous embodiment of the invention, a snap-in element is disposed between the housing part bearing the connecting part and the housing part bearing the handle part. This measure ensures that the pressure can for the medium remains in the adjusted locked position. The number of snap-in positions can be produced as desired, thereby permitting the right adjusting angle for every situation.
The snap ring already fixes the two housing parts axially relative to each other. The housing parts thus have an exactly defined position relative to each other, thereby permitting a plurality of well-marked snap-in points to be re
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patent: 2754152 (1956-07-01), Gilmour
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patent: 5069389 (1991-12-01), Bitsakos
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Richter, sections entitled "Rastwerke" and Verriegelungen from Bauelemente der Feinmechanik (Construction Elements of Fine Mechanics), Berlin: VDI-Verlag GmbH, pp. 484-501, 1929.
Evans Robin O.
Kashnikow Andres
Kunststofftechnik Bruno Jesswein
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