EP0403804B1 - Device for coating the inner surface of hollow spaces - Google Patents

Device for coating the inner surface of hollow spaces Download PDF

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Publication number
EP0403804B1
EP0403804B1 EP90109488A EP90109488A EP0403804B1 EP 0403804 B1 EP0403804 B1 EP 0403804B1 EP 90109488 A EP90109488 A EP 90109488A EP 90109488 A EP90109488 A EP 90109488A EP 0403804 B1 EP0403804 B1 EP 0403804B1
Authority
EP
European Patent Office
Prior art keywords
positioning stop
nozzle
spray
spray gun
contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90109488A
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German (de)
French (fr)
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EP0403804A1 (en
Inventor
Willy Dipl. Ing. Klingen
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J Wagner GmbH
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J Wagner GmbH
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B05B12/122—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to presence or shape of target

Definitions

  • the invention relates to a device for the interior coating of cavities, in particular an automobile body according to the preamble of claim 1.
  • a device for the interior coating of cavities in particular an automobile body according to the preamble of claim 1.
  • Such a device is known from EP 140 017.
  • spray probes are detachably attached to a spray gun.
  • the spray probes are stored in a holder with several receptacles and are removed by the worker as required and attached to the spray gun.
  • Each holder in the spray probe holder is assigned a holder and an indicator lamp which lights up when the corresponding spray probe has been removed from the holder.
  • there is a symbol display panel with associated lights which is connected by lines to the spray probe holder and a control unit and on which the respective spray position of the corresponding spray probe is displayed, the lights illuminating when the corresponding lamp on the spray probe holder lights up when the spray probe is removed.
  • a spray shot is only triggered when the spray probe is correctly inserted into the cavity to be coated with respect to the direction of insertion.
  • it is also checked whether the spray probe is correctly and liquid-tightly attached to the spray gun before the trigger mechanism is released for the spray shot.
  • 10 denotes a spray gun and 11 a spray probe detachably attached to it.
  • the spray gun 10 has a handle 12, a protective bracket 13, a liquid channel 14 with valve 14a and a compressed air duct 15.
  • the spray gun 10 is provided with a liquid-tight mechanical plug-in coupling 16 for receiving the spray probe 11.
  • a proximity switch 17 Immediately next to the plug-in coupling 16 is a proximity switch 17.
  • the nozzle probe 11 has a nozzle tube 18, the rear end of which is designed as a plug-in insert 19 for insertion into the opening of the coupling 16, and the front end of which is provided with nozzle openings 20.
  • a positioning stop 21 is fastened to the nozzle tube 18, the shape of the surface shape of the wall 22 delimiting the cavity H to be coated (indicated by dash-dotted lines in the drawing) in the region around the insertion opening 23 for the nozzle tube 18 .
  • a double-arm lever 24 is pivotably articulated, one end of which, as a contact sensor, engages through an opening in the positioning stop 21, and the other end of which is connected to a Bowden cable 25.
  • the other end of the Bowden cable 25 is operatively connected to a sleeve 26 which coaxially surrounds the nozzle tube 18 and can be pushed back and forth to a limited extent in the axial direction, the sleeve 26 being loaded by a helical spring 27 in the direction of displacement towards the end of the nozzle tube 18 on the nozzle opening side.
  • the arrangement is such that in the rest position shown in Figures 1 and 2, the spring 27 has shifted the sleeve 26 into its right end position, in which the contact sensor end 24a of the lever 24 protrudes slightly beyond the front of the positioning stop 21 and in which the rear end edge 26a of the sleeve 26 is removed from the proximity switch 17 of the spray gun 10.
  • the spray gun 10 with attached nozzle probe 11 approximates the cavity to be coated and the front end of the nozzle tube 18 is inserted into the cavity through the opening 23 of the wall 22, then the positioning stop 21 finally lies against the outer surface 22a of the wall 22, which then places the nozzle openings 20 at the desired location on the wall Cavity H are located and also take the desired direction position.
  • the contact sensor end 24a of the lever 24 When pressing the positioning stop 21 against the outer surface 22a, the contact sensor end 24a of the lever 24 is pressed in, ie the lever 24 is pivoted counterclockwise by a predetermined angle, with the result that the sleeve 26 against the force of the spring is above the Bowden cable 25 27 is shifted to the left, the end edge 26a of the sleeve 26 then damping the proximity switch 17 at the end of the displacement path.
  • the proximity switch 17 thus emits a switching signal, which is used to release the spray shot triggering. This can take place, for example, in such a way that the valve 14a of the liquid line 14 is a solenoid valve which is controlled indirectly or directly by the proximity switch 17, that is to say it opens by the switching signal mentioned and releases the spray shot.
  • the valve is closed again after a preselected time by means of a conventional timer circuit.
  • the spray shot is triggered automatically without the worker actuating a trigger guard.
  • the spray gun with a trigger bracket that can be actuated by the worker and, for example, an electromagnetic trigger lock, which only allows the trigger bracket to be pulled through when the proximity switch 17 has emitted its switching signal.
  • it can also be carried out in such a way that although pulling the trigger guard is necessary to open the valve 14a, the valve only opens when it is controlled by the switching signal of the proximity switch 17.
  • the proximity switches 17 directly represent the contact sensors.
  • proximity switches 17 are accommodated at the free mouth end of tubes 31, which lead to the insertion end of the nozzle tube 18 and at the same time as receptacles for the proximity switches 17 and as stabilizers for the positioning stop 21 serve.
  • the proximity switches 17 penetrate openings in the positioning stop 21 in such a way that their contact surface is flush with the front surface of the positioning stop 21.
  • the electrical lines of the proximity switches 17 lead in the stabilizer tubes 31 into the area of the nozzle tube 18 and are in conductive connection there with contact rings 32, which are located on the surface of a contact cylinder coaxially surrounding the nozzle tube 18.
  • contact rings 32 which are located on the surface of a contact cylinder coaxially surrounding the nozzle tube 18.
  • the contact rings 32 a finger-like contactor 34 located next to the plug-in coupling 16 of the spray gun 10, so that when the spray probe 11 is plugged in there is a conductive connection between the proximity switches 17 and the spray gun 10.
  • the mode of operation can be understood from the description of the first exemplary embodiment. If the front surface of the positioning stop 21 lies on the outer surface of the cavity wall, then the proximity switches 17 transmit a switching signal to the spray gun, which releases the triggering of the firing shot. It is essential that the two proximity switches 17 are connected together in an AND circuit, that is, a switching signal is only passed on when both proximity switches 17 respond simultaneously, similar to the use of two proximity switches 17 in the first embodiment.
  • Fig. 5 shows a modification in which the proximity switch 17 is preceded by a small, spring-loaded contact pin 40 which extends through the opening of the positioning stop 21 and is loaded by its spring 41 so that its sensor end protrudes slightly beyond the front surface of the positioning stop 21.
  • the pin 40 is pushed back against the force of the spring 41 and then dampens the proximity switch 17 located behind it of the positioning stop on the outer wall of the cavity.
  • the mechanical (first exemplary embodiment) or electrical (second exemplary embodiment) “signal bridge” between the nozzle probe and spray gun is only closed when the nozzle probe is properly coupled to the spray gun; the device according to claim 8 thus also ensures that a spray shot can only be fired when the worker has properly coupled the spray probe.

Landscapes

  • Nozzles (AREA)
  • Spray Control Apparatus (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)

Description

Die Erfindung betrifft eine Einrichtung zum Innenbeschichten von Hohlräumen, insbesondere einer Automobilkarosse gemäß dem Oberbegriff des Patentanspruchs 1. Eine derartige Einrichtung ist aus der EP 140 017 bekannt.The invention relates to a device for the interior coating of cavities, in particular an automobile body according to the preamble of claim 1. Such a device is known from EP 140 017.

Bei der bekannten Einrichtung werden Sprühsonden an einer Sprühpistole lösbar befestigt. Die Sprühsonden sind in einem Halterungsteil mit mehreren Aufnahmen aufbewahrt und werden vom Werker nach Bedarf entnommen und auf der Sprühpistole befestigt. Jeder Aufnahme in der Sprühsondenhalterung ist ein Halter sowie eine Anzeigelampe zugeordnet, die jeweils dann aufleuchtet, wenn die entsprechende Sprühsonde aus der Halterung entnommen worden ist. Darüber hinaus ist eine Symbol-Anzeigetafel mit ebenfalls zugeordneten Lämpchen vorhanden, die mittels Leitungen mit der Sprühsondenhalterung und einem Steuergerät verbunden ist und auf der die jeweilige Sprühposition der entsprechenden Sprühsonde angezeigt wird, wobei die Lämpchen jeweils dann aufleuchten, wenn die entsprechende Lampe an der Sprühsondenhalterung bei Entnahme der Sprühsonde aufleuchtet. Mit diesem bekannten System wird also auf der Grundlage der Aufmerksamkeit des Werkers sichergestellt, daß die richtige Düsensonde in den richtigen Hohlraum eingeführt wird. Maßnahmen zum Sicherstellen, daß die Düsensonde bezüglich Richtung und Tiefe korrekt in den Hohlraum eingeführt wird (exakte Anlage des Positionieranschlags an der die Einführöffnung umgebenden Hohlraumwandung) sind jedoch bei der bekannten Einrichtung nicht getroffen. Dasselbe gilt auch für den Vorgang der korrekten Befestigung der Düsensonde an der Sprühpistole.In the known device, spray probes are detachably attached to a spray gun. The spray probes are stored in a holder with several receptacles and are removed by the worker as required and attached to the spray gun. Each holder in the spray probe holder is assigned a holder and an indicator lamp which lights up when the corresponding spray probe has been removed from the holder. In addition, there is a symbol display panel with associated lights, which is connected by lines to the spray probe holder and a control unit and on which the respective spray position of the corresponding spray probe is displayed, the lights illuminating when the corresponding lamp on the spray probe holder lights up when the spray probe is removed. With this known system it is thus ensured, based on the attention of the operator, that the correct nozzle probe is inserted into the correct cavity. Measures to ensure that the nozzle probe is correctly inserted into the cavity in terms of direction and depth (exact abutment of the positioning stop on the cavity wall surrounding the insertion opening) have not been taken with the known device. The same applies to the process of correctly attaching the nozzle probe to the spray gun.

Aufgabe der vorliegenden Erfindung ist es deshalb, sicherzustellen, daß ungeachtet der Aufmerksamkeit des Werkers ein Sprühschuß nur dann ausgelöst wird bzw. ausgelöst werden kann, wenn die an der Sprühpistole befestigte Sprühsonde bezüglich der Einführtiefe korrekt in den zu beschichtenden Hohlraum eingeführt ist. Die Lösung dieser Aufgabe ergibt sich aus den Merkmalen des Patentanspruchs 1.It is therefore an object of the present invention to ensure that, regardless of the operator's attention, a spray shot is only triggered or can be triggered if the spray probe attached to the spray gun is correctly inserted into the cavity to be coated with respect to the insertion depth. The solution to this problem results from the features of patent claim 1.

Gemäß der vorteilhaften Ausgestaltung der Erfindung nach Anspruch 2 wird ein Sprühschuß nur dann ausgelöst, wenn die Sprühsonde auch bezüglich der Einführrichtung korrekt in den zu beschichtenden Hohlraum eingeführt ist. Bei der weiteren vorteilhaften Ausgestaltung der Erfindung nach Anspruch 8 wird ferner überprüft, ob die Sprühsonde richtig und flüssigkeitsdicht an der Sprühpistole befestigt ist, bevor der Auslösemechanismus für den Sprühschuß freigegeben wird. Weitere zweckmäßige Ausgestaltungen der Erfindung sind in den weiteren Unteransprüchen gekennzeichnet.According to the advantageous embodiment of the invention according to claim 2, a spray shot is only triggered when the spray probe is correctly inserted into the cavity to be coated with respect to the direction of insertion. In the further advantageous embodiment of the invention according to claim 8, it is also checked whether the spray probe is correctly and liquid-tightly attached to the spray gun before the trigger mechanism is released for the spray shot. Further expedient embodiments of the invention are characterized in the further subclaims.

Die Erfindung wird nachfolgend anhand der Zeichnungen näher erläutert. Es zeigen

Fig. 1
eine erste Ausführungsform der Einrichtung in Seitenansicht, teilweise geschnitten,
Fig. 2
einen Teilausschnitt aus Fig. 1 im vergrößerten Maßstab,
Fig. 3
eine zweite Ausführungsform der Einrichtung in Seitenansicht, teilweise geschnitten,
Fig. 4
einen Teilausschnitt aus Fig. 3 im vergrößerten Maßstab, und
Fig. 5
einen Teilschnitt zur Erläuterung einer Abwandlungsform der Einrichtung von Fig. 3.
The invention is explained in more detail below with reference to the drawings. Show it
Fig. 1
a first embodiment of the device in side view, partially in section,
Fig. 2
2 shows a partial section from FIG. 1 on an enlarged scale,
Fig. 3
a second embodiment of the device in side view, partially in section,
Fig. 4
a partial section of Fig. 3 on an enlarged scale, and
Fig. 5
4 shows a partial section to explain a modification of the device from FIG. 3.

Bei den Ausführungsbeispiel nach den Figuren 1 und 2 ist mit 10 eine Sprühpistole und mit 11 eine daran lösbar befestigte Sprühsonde bezeichnet. Die Sprühpistole 10 weist einen Handgriff 12, einen Schutzbügel 13, einen Flüssigkeitskanal 14 mit Ventil 14a und einen Druckluftkanal 15 auf. An ihrem vorderen Ende ist die Sprühpistole 10 mit einer flüssigkeitsdichten mechanischen Steckkupplung 16 zur Aufnahme der Sprühsonde 11 versehen. Unmittelbar neben der Steckkupplung 16 befindet sich ein Näherungsschalter 17. Die Düsensonde 11 weist ein Düsenrohr 18 auf, dessen hinteres Ende als Steckeinsatz 19 zum Einführen in die Öffnung der Kupplung 16 ausgebildet ist, und dessen vorderes Ende mit Düsenöffnungen 20 versehen ist. Im vorgegebenen Abstand hinter den Düsenöffnungen 20 ist am Düsenrohr 18 ein Positionieranschlag 21 befestigt, dessen Form der Oberflächenform der den zu beschichtenden Hohlraum H begrenzenden Wandung 22 (auf der Zeichnung in strichpunktierten Linien angedeutet) im Bereich um die Einführöffnung 23 für das Düsenrohr 18 angepasst ist. An einer ausgewählten Stelle der Rückseite des Positionieranschlags 21 ist ein Doppelarmhebel 24 schwenkbar angelenkt, dessen eines Ende als Kontaktfühler durch eine Öffnung im Positionieranschlag 21 hindurchgreift, und dessen anderes Ende mit einem Bowdenzug 25 verbunden ist. Das andere Ende des Bowdenzugs 25 steht in Wirkverbindung mit einer das Düserrohr 18 koaxial umgebenden und in Achsrichtung begrenzt hin- und herverschiebbaren Hülse 26, wobei die Hülse 26 durch eine Schraubenfeder 27 in Verschieberichtung zum düsenöffnungsseitigen Ende des Düsenrohrs 18 hin belastet ist. Die Anordnung ist dabei so getroffen, daß in der in den Figuren 1 und 2 dargestellten Ruhestellung die Feder 27 die Hülse 26 in ihre rechte Endlage verschoben hat, in welcher das Kontaktfühlerende 24a des Hebels 24 über die Vorderseite des Positionieranschlags 21 geringfügig hinausragt und in welcher der hintere Stirnrand 26a der Hülse 26 vom Näherungsschalter 17 der Sprühpistole 10 entfernt ist.In the exemplary embodiment according to FIGS. 1 and 2, 10 denotes a spray gun and 11 a spray probe detachably attached to it. The spray gun 10 has a handle 12, a protective bracket 13, a liquid channel 14 with valve 14a and a compressed air duct 15. At its front end, the spray gun 10 is provided with a liquid-tight mechanical plug-in coupling 16 for receiving the spray probe 11. Immediately next to the plug-in coupling 16 is a proximity switch 17. The nozzle probe 11 has a nozzle tube 18, the rear end of which is designed as a plug-in insert 19 for insertion into the opening of the coupling 16, and the front end of which is provided with nozzle openings 20. At the predetermined distance behind the nozzle openings 20, a positioning stop 21 is fastened to the nozzle tube 18, the shape of the surface shape of the wall 22 delimiting the cavity H to be coated (indicated by dash-dotted lines in the drawing) in the region around the insertion opening 23 for the nozzle tube 18 . At a selected point on the rear side of the positioning stop 21, a double-arm lever 24 is pivotably articulated, one end of which, as a contact sensor, engages through an opening in the positioning stop 21, and the other end of which is connected to a Bowden cable 25. The other end of the Bowden cable 25 is operatively connected to a sleeve 26 which coaxially surrounds the nozzle tube 18 and can be pushed back and forth to a limited extent in the axial direction, the sleeve 26 being loaded by a helical spring 27 in the direction of displacement towards the end of the nozzle tube 18 on the nozzle opening side. The arrangement is such that in the rest position shown in Figures 1 and 2, the spring 27 has shifted the sleeve 26 into its right end position, in which the contact sensor end 24a of the lever 24 protrudes slightly beyond the front of the positioning stop 21 and in which the rear end edge 26a of the sleeve 26 is removed from the proximity switch 17 of the spray gun 10.

Wird nun die Sprühpistole 10 mit aufgesetzter Düsensonde 11 dem zu beschichtenden Hohlraum angenähert und das Vorderende des Düsenrohrs 18 durch die Öffnung 23 der Wandung 22 hindurch in den Hohlraum eingeführt, dann legt sich schließlich der Positionieranschlag 21 gegen die Außenfläche 22a der Wandung 22, womit sich dann die Düsenöffnungen 20 an der gewünschten Stelle des Hohlraums H befinden und auch die gewünschte Richtungsposition einnehmen. Beim Anlegen unter Druck des Positionieranschlags 21 an die Außenfläche 22a wird das Kontaktfühlerende 24a des Hebels 24 eingedrückt, d.h. der Hebel 24 um einen vorgegebenen Winkel gegen den Uhrzeigersinn verschwenkt, mit der Folge, daß über dem Bowdenzug 25 die Hülse 26 gegen die Kraft der Feder 27 nach links verschoben wird, wobei dann am Ende des Verschiebungswegs der Stirnrand 26a der Hülse 26 den Näherungsschalter 17 bedämpft. Der Näherungsschalter 17 gibt damit ein Schaltsignal ab, welches dazu herangezogen wird, die Sprühschuß-Auslösung freizugeben. Dies kann beispielsweise so erfolgen, daß das Ventil 14a der Flüssigkeitsleitung 14 ein Magnetventil ist, das vom Näherungsschalter 17 mittelbar oder unmittelbar gesteuert wird,durch das erwähnte Schaltsignal also öffnet und den Sprühschuß freigibt. Mittels einer üblichen Timer-Schaltung wird das Ventil nach vorgewählter Zeit wieder geschlossen. Im eben beschriebenen Fall erfolgt also die Sprühschuß-Auslösung selbsttätig, ohne daß der Werker einen Abzugsbügel betätigt. Es ist jedoch auch möglich, die Sprühpistole mit einem durch den Werker betätigbaren Abzugsbügel und einer beispielsweise elektromagnetischen Abzugssperre zu versehen, die ein Durchziehen des Abzugsbügels erst dann erlaubt, wenn der Näherungsschalter 17 sein Schaltsignal abgegeben hat. Schließlich kann auch so vorgegangen werden, daß zwar zum Öffnen des Ventils 14a ein vorheriges Durchziehen des Abzugsbügels erforderlich ist, das Ventil aber erst dann öffnet, wenn es vom Schaltsignal des Näherungsschalters 17 angesteuert wird.Now the spray gun 10 with attached nozzle probe 11 approximates the cavity to be coated and the front end of the nozzle tube 18 is inserted into the cavity through the opening 23 of the wall 22, then the positioning stop 21 finally lies against the outer surface 22a of the wall 22, which then places the nozzle openings 20 at the desired location on the wall Cavity H are located and also take the desired direction position. When pressing the positioning stop 21 against the outer surface 22a, the contact sensor end 24a of the lever 24 is pressed in, ie the lever 24 is pivoted counterclockwise by a predetermined angle, with the result that the sleeve 26 against the force of the spring is above the Bowden cable 25 27 is shifted to the left, the end edge 26a of the sleeve 26 then damping the proximity switch 17 at the end of the displacement path. The proximity switch 17 thus emits a switching signal, which is used to release the spray shot triggering. This can take place, for example, in such a way that the valve 14a of the liquid line 14 is a solenoid valve which is controlled indirectly or directly by the proximity switch 17, that is to say it opens by the switching signal mentioned and releases the spray shot. The valve is closed again after a preselected time by means of a conventional timer circuit. In the case just described, the spray shot is triggered automatically without the worker actuating a trigger guard. However, it is also possible to provide the spray gun with a trigger bracket that can be actuated by the worker and, for example, an electromagnetic trigger lock, which only allows the trigger bracket to be pulled through when the proximity switch 17 has emitted its switching signal. Finally, it can also be carried out in such a way that although pulling the trigger guard is necessary to open the valve 14a, the valve only opens when it is controlled by the switching signal of the proximity switch 17.

Bei dem gezeichneten Ausführungsbeispiel nach den Figuren 1 und 2 ist zwar nur ein einziger Hebel 24 mit Kontaktfühlerende 24a dargestellt, bevorzugt ist es jedoch, zwei Hebel 24 mit zur Hülse 26 führendem Bowdenzug 25 vorzusehen, wobei sich die beiden Kontaktfühlerstellen möglichst weit voneinander entfernt befinden, beispielsweise in etwa diametral zum Düsenrohr 18. Damit wird die Sicherheit bezüglich einer völligen Anlage des Positionieranschlags 21 an der Fläche 22a erhöht und eine gleichmäßigere Kraftübertragung auf die Hülse 26 gewährleistet. Bei formmäßig sehr komplexen Oberflächen 22a kann es sogar zweckmäßig sein, einen 3-Punkt-Kontakt vorzusehen, also den Positionieranschlag 21 mit drei Hebeln 24, jeweils mit einem Bowdenzug 25 auszurüsten.In the embodiment shown in FIGS. 1 and 2, only a single lever 24 with contact sensor end 24a is shown, but it is preferred to provide two levers 24 with a Bowden cable 25 leading to the sleeve 26, the two contact sensor locations being as far apart as possible, for example, approximately diametrically to the nozzle tube 18. This increases the safety with regard to the complete abutment of the positioning stop 21 on the surface 22a and ensures a more uniform power transmission to the sleeve 26. In the case of surfaces 22a which are very complex in shape, it may even be expedient to provide a 3-point contact, that is to say to equip the positioning stop 21 with three levers 24, each with a Bowden cable 25.

Anhand der Figuren 3 und 4 soll nun eine zweite Ausführungsform der Erfindung erläutert werden. Dabei sind Teile, die mit denjenigen der Ausführungsform von Fig. 1 gleich sind, mit den gleichen Bezugszeichen bezeichnet. Im Gegensatz zum ersten Ausführungsbeispiel stellen hier die Näherungsschalter 17 unmittelbar die Kontaktfühler dar. Zu diesem Zweck sind Näherungsschalter 17 am freien Mündungsende von Rohren 31 untergebracht, die zum Einsteckende des Düsenrohrs 18 führen und zugleich als Aufnahmen für die Näherungsschalter 17 und als Stabilisatoren für den Positionierungsanschlag 21 dienen. Die Näherungsschalter 17 durchsetzen Durchbrechungen des Positionierungsanschlags 21, derart, daß ihre Kontaktfläche mit der Vorderfläche des Positionierungsanschlags 21 fluchtet. Die elektrischen Leitungen der Näherungsschalter 17 führen in den Stabilisatorrohren 31 bis in den Bereich des Düsenrohrs 18 und stehen dort mit Kontaktringen 32 in leitender Verbindung, die sich auf der Oberfläche eines das Düsenrohr 18 koaxial umgebenden Kontaktzylinders befinden. Bei auf die Sprühpistole 10 aufgesteckter Düsensonde 11 kontaktieren die Kontaktringe 32 einen neben der Steckkupplung 16 der Sprühpistole 10 befindlichen, fingerartigen Kontaktgeber 34, so daß bei aufgesteckter Sprühsonde 11 eine Leitverbindung zwischen den Näherungsschaltern 17 und der Sprühpistole 10 besteht. Die Funktionsweise ist aus der Beschreibung des ersten Ausführungsbeispiels verständlich. Liegt die Vorderfläche des Positionieranschlags 21 auf der Außenfläche der Hohlraumwandung an, dann geben die Näherungsschalter 17 ein Schaltsignal an die Sprühpistole weiter, welches die Sprühschuß-Auslösung freigibt. Wesentlich dabei ist, daß die beiden Näherungsschalter 17 in UND-Schaltung zusammengeschaltet sind, d.h. nur dann ein Schaltsignal weitergegeben wird, wenn beide Näherungsschalter 17 gleichzeitig ansprechen, ähnlich wie bei Verwendung von zwei Näherungsschaltern 17 beim ersten Ausführungsbeispiel.A second embodiment of the invention will now be explained with reference to FIGS. 3 and 4. Parts that are the same as those in the embodiment of FIG. 1 are identified by the same reference numerals. In contrast to the first embodiment, the proximity switches 17 directly represent the contact sensors. For this purpose, proximity switches 17 are accommodated at the free mouth end of tubes 31, which lead to the insertion end of the nozzle tube 18 and at the same time as receptacles for the proximity switches 17 and as stabilizers for the positioning stop 21 serve. The proximity switches 17 penetrate openings in the positioning stop 21 in such a way that their contact surface is flush with the front surface of the positioning stop 21. The electrical lines of the proximity switches 17 lead in the stabilizer tubes 31 into the area of the nozzle tube 18 and are in conductive connection there with contact rings 32, which are located on the surface of a contact cylinder coaxially surrounding the nozzle tube 18. Contact with the nozzle probe 11 attached to the spray gun 10 the contact rings 32 a finger-like contactor 34 located next to the plug-in coupling 16 of the spray gun 10, so that when the spray probe 11 is plugged in there is a conductive connection between the proximity switches 17 and the spray gun 10. The mode of operation can be understood from the description of the first exemplary embodiment. If the front surface of the positioning stop 21 lies on the outer surface of the cavity wall, then the proximity switches 17 transmit a switching signal to the spray gun, which releases the triggering of the firing shot. It is essential that the two proximity switches 17 are connected together in an AND circuit, that is, a switching signal is only passed on when both proximity switches 17 respond simultaneously, similar to the use of two proximity switches 17 in the first embodiment.

Fig. 5 zeigt eine Abwandlungsform, bei welcher dem Näherungsschalter 17 ein kleiner, federbelasteter Kontaktstift 40 vorgeschaltet ist, der durch die Durchbrechung des Positionieranschlags 21 hindurchgreift und durch seine Feder 41 so belastet ist, daß sein Fühlerende geringfügig über die Vorderfläche des Positionieranschlags 21 vorsteht. Bei Anlage des Anschlags 21 an der Hohlraumwandung wird der Stift 40 gegen die Kraft der Feder 41 zurückgeschoben und bedämpft dann den hinter ihm befindlichen Näherungsschalter 17. Die Zwischenschaltung des federbelasteten Kontaktstifts 40 dient dazu, es dem Werker fühlbar zu machen, daß er die exakte Auflage des Positionieranschlags an der Hohlraumaußenwand erreicht hat.Fig. 5 shows a modification in which the proximity switch 17 is preceded by a small, spring-loaded contact pin 40 which extends through the opening of the positioning stop 21 and is loaded by its spring 41 so that its sensor end protrudes slightly beyond the front surface of the positioning stop 21. When the stop 21 bears against the cavity wall, the pin 40 is pushed back against the force of the spring 41 and then dampens the proximity switch 17 located behind it of the positioning stop on the outer wall of the cavity.

Selbstverständlich kann die Erfindung zahlreiche Abwandlungen erfahren. Dies betrifft insbesondere die Art und den Aufbau der Schalter, die mechanische oder elektrische Weiterführung des Schaltsignals von der Sprühsonde 11 zur Sprühpistole 10, die Zahl der Kontaktfühler und die Auswertung der von diesen erzeugten Schaltsignale.Of course, the invention can undergo numerous modifications. This applies in particular to the type and structure of the switches, the mechanical or electrical continuation of the switching signal from the spray probe 11 to the spray gun 10, the number of contact sensors and the evaluation of these generated switching signals.

Schließlich ist noch darauf hinzuweisen, daß die mechanische (erstes Ausführungsbeispiel) bzw. elektrische (zweites Ausführungsbeispiel) "Signalbrücke" zwischen Düsensonde und Sprühpistole nur dann geschlossen ist, wenn die Düsensonde einwandfrei an die Sprühpistole angekoppelt ist; die Einrichtung gemäß Anspruch 8 stellt somit auch sicher, daß nur dann ein Sprühschuß abgegeben werden kann, wenn der Werker die Sprühsonde ordnungsgemäß angekoppelt hat.Finally, it should be pointed out that the mechanical (first exemplary embodiment) or electrical (second exemplary embodiment) “signal bridge” between the nozzle probe and spray gun is only closed when the nozzle probe is properly coupled to the spray gun; the device according to claim 8 thus also ensures that a spray shot can only be fired when the worker has properly coupled the spray probe.

Claims (8)

  1. Device for coating the inside of hollow chambers, especially an automobile body, with a spray gun (10) having a nozzle-probe plug coupling (16) with a spray-blast triggering device and having nozzle-probes (11) which can be put on to the spray gun, each of which is assigned to a specific hollow chamber and which comprises a nozzle tube (18) with a plug end, nozzle end and positioning stop (21), characterised in that the positioning stop (21) is provided with at least one contact sensor (24; 17; 40) which is in operative connection with the spray-blast triggering device of the spray gun (10).
  2. Device according to claim 1, characterised in that at least two contact sensors (24; 17; 40) are provided and are disposed at points on the positioning stop (21) which are remote from each other.
  3. Device according to claim 1 or 2, characterised in that the contact sensor is a double arm lever (24) pivotably mounted on the positioning stop (21), wherein a free end (24a) of the lever (24) passes through an aperture in the positioning stop (21) and protrudes towards the front surface of the workpiece to be coated, and the other free end of the lever (24) is connected to the spray-blast triggering device of the spray gun (10) by means of a signal line.
  4. Device according to claim 3, characterised in that the pivoted lever (24) is connected by means of a Bowden cable (25) to a sleeve (26) which is located coaxially on the nozzle tube (18) against spring pressure and which is axially displaceable thereon, and in that in the orifice region of the spray gun (10) a proximity switch (17) is arranged at such a point that it can be damped by the displaceable sleeve (26).
  5. Device according to claim 1 or 2, characterised in that the contact sensor is a proximity switch (17) which engages through an aperture in the positioning stop (21) and is in alignment with its front surface facing the workpiece to be coated.
  6. Device according to claim 1 or 2, characterised in that the contact sensor is a spring-loaded contact pin (40) which engages through an aperture in the positioning stop (21) and projects beyond the front surface of the positioning stop (21) facing the workpiece to be coated, a proximity switch (17) being subsequently associated with the contact pin (40).
  7. Device according to claim 5 or 6, characterised in that the proximity switch (17) is mounted in a strut-like tube (31) which leads to and is secured to the plug end of the nozzle tube (18), electrical supply lines being provided in the strut-like tube (31).
  8. Device according to claim 7, characterised in that a contact cylinder (33) with contact rings is disposed at the plug end of the nozzle-probe (11), and a contact maker (34) co-operating therewith is disposed at the plug end of the spray gun (10).
EP90109488A 1989-06-19 1990-05-18 Device for coating the inner surface of hollow spaces Expired - Lifetime EP0403804B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3919959A DE3919959C1 (en) 1989-06-19 1989-06-19
DE3919959 1989-06-19

Publications (2)

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EP0403804A1 EP0403804A1 (en) 1990-12-27
EP0403804B1 true EP0403804B1 (en) 1994-01-05

Family

ID=6383036

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90109488A Expired - Lifetime EP0403804B1 (en) 1989-06-19 1990-05-18 Device for coating the inner surface of hollow spaces

Country Status (5)

Country Link
US (1) US5046450A (en)
EP (1) EP0403804B1 (en)
JP (1) JPH0389967A (en)
DE (1) DE3919959C1 (en)
ES (1) ES2048357T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11950677B2 (en) 2019-02-28 2024-04-09 L'oreal Devices and methods for electrostatic application of cosmetics

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2337709A (en) * 1942-08-01 1943-12-28 Int Harvester Co Coating apparatus
US2604872A (en) * 1948-04-26 1952-07-29 Pacific Clay Products Apparatus for spraying fluid into tubular members
US2814083A (en) * 1955-01-27 1957-11-26 United States Pipe Foundry Mold coating apparatus
BE755695A (en) * 1969-09-03 1971-03-03 Carrier Engineering Co Ltd APPARATUS AND METHOD FOR COATING SURFACES USING A SPRAY GUN
DE2526702A1 (en) * 1975-06-14 1976-12-23 Volkswagenwerk Ag Spray nozzle for protectively coating inner walls of hollow spaces - has slots lying in various planes w.r.t. axis of nozzle tube
SE422282B (en) * 1975-12-18 1982-03-01 Atlas Copco Ab SPRAY GUN
DE3004495A1 (en) * 1980-02-07 1981-08-13 Daimler-Benz Ag, 7000 Stuttgart Spraying system for coating vehicle body cavities internally - has control unit coupled to quantity measurer and spray-nozzle reader
JPS5992054A (en) * 1982-11-19 1984-05-28 Tokico Ltd Sensor unit
DE3331784A1 (en) * 1983-09-02 1985-03-21 J. Wagner Gmbh, 7990 Friedrichshafen DEVICE FOR TREATING CAVES

Also Published As

Publication number Publication date
JPH0389967A (en) 1991-04-15
DE3919959C1 (en) 1990-11-15
US5046450A (en) 1991-09-10
ES2048357T3 (en) 1994-03-16
EP0403804A1 (en) 1990-12-27

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