EP1902786B1 - Gravity cup for a paint spray gun - Google Patents

Abstract

Gravity flow reservoir cup for a paint spray gun has a cup-type container (1), a lid (2) and a connection part (3) for direct fitting of the cup to the spray gun. The cup has a connecting part that is directly formed on the lid with a screw block element for direct connection of the cup to the spray gun.

Description

The invention relates to a flow cup for a paint spray gun according to the preamble of claim 1.

Conventional gravity cups for paint spray guns usually have a cup-shaped container, on the underside of an opening with a connector for releasably securing the container is provided on the top of the paint spray gun. The connecting part usually consists of a connecting socket inserted into the container bottom, which has an external thread for screwing into a corresponding threaded opening on the upper side of the paint spray gun. The cup-shaped container is closed on its upper side usually by a suitable lid, which is intended to prevent unwanted escape of color. However, the production of such flow cups with the separately manufactured and then connected to the container connecting parts is relatively complex and associated with correspondingly high costs.

From the WO 01/12337 A1 Gravity cups are already known which comprise a cup-shaped container and a lid which can be placed thereon with a hollow-cylindrical connection part. In this case, the connection part comprises a connecting piece, which is formed directly on the cup cover, for quick connection of the flow cup to the spray gun. Another gravity cup of this kind is through the EP 1 366 823 A1 known. From the (post-published) older international Patent Application PCT / US2003 / 034034 (International Publication No. W02004 / 037433 A1 ) is known a flow cup for a paint spray gun with a cup-shaped container and a lid can be placed on the container, in which a connection part in the form of a directly formed on the cover connection piece is provided on the lid, wherein at the connecting piece a Schraubkeilelement for quick connection of the flow cup to the Paint spray gun is arranged. For fastening the lid to the container, a screw thread is provided, as shown in FIG WO2004 / 037433 A1 seen. Such a screw thread leads to tightness problems when the flow cup is placed on the paint spray gun intended use of the connecting piece.

The object of the invention is to provide a flow cup of the type mentioned, which is inexpensive to produce and in which the cup-shaped container is closed on its upper side by a suitable lid, which is intended to prevent unwanted escape of the paint.

This object is achieved by a flow cup having the features of claim 1. Advantageous embodiments and advantageous developments of the invention are the subject of the dependent claims.

Figur 1

einen erfindungsgemäßen Fließbecher im Schnitt;

Figur 2

eine Schnittansicht entlang der Linie A-A von Figur 1;

Figur 3

eine Detailansicht des Bereichs X von Figur 1;

Figur 4

eine Ansicht des becherförmigen Behälters und des Deckels eines Fließbechers mit einem Schnellverschlussgewinde zum Aufschrauben des Deckels auf den Behälter;

Figur 5

eine Detailansicht des Bereichs Y von Figur 4;

Figur 6

eine Detailansicht des Bereichs W von Figur 4 und

Figur 7

eine Schnittansicht entlang der Linie A-A von Figur 4.

Other features and advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawings. Show it:

FIG. 1

a flow cup according to the invention in section;

FIG. 2

a sectional view taken along the line AA of FIG. 1 ;

FIG. 3

a detailed view of the area X of FIG. 1 ;

FIG. 4

a view of the cup-shaped container and the lid of a flow cup with a quick-connect thread for screwing the lid on the container;

FIG. 5

a detail view of the area Y of FIG. 4 ;

FIG. 6

a detailed view of the area W of FIG. 4 and

FIG. 7

a sectional view taken along the line AA of FIG. 4 ,

The in FIG. 1 illustrated flow cup for a paint spray gun contains a cup-shaped container 1 and a lid 2 can be placed on this, on which a connection part 3 is formed for releasably securing the fluid cup to a paint spray gun. Both the container 1 and the lid 2 with the integrally formed connection part 3 are expediently produced as injection-molded parts made of plastic. The cup-shaped container 1 is filled in the position shown with the cover 2 removed. Subsequently, the cover 2 can be placed and used with its connection part 3 in the connection opening of an upside-down paint spray gun. For spraying, the paint spray gun can then be turned over so that the flow cup is located at the top of the paint spray gun. In order to allow venting of the flow cup, for example provided on the bottom 4 of the fluid cup - not shown - vent valve can be opened or an initially closed venting channel by means of a pin or the like. Be penetrated. By a reclosable after use bleed valve or a reclosable vent, there is the advantage that the flow cup can also be used to store not completely used up color.

The in the FIGS. 2 and 3 enlarged connection part 3 consists of a molded on the conical cover 2 or otherwise molded tubular connection piece 5, a front hollow cylindrical guide portion 6, an adjoining external thread 7 for screwing into a conventional internal thread and a subsequent to the external thread 7 Schraubkeilelement 8 for a Quick connection of the flow cup with the paint spray gun contains. In the embodiment shown, the Schraubkeilelement 8 is formed by a groove 9 with a circumferentially oblique screw surface 10 which comes into engagement with a corresponding mating surface on a lug or projection of the paint spray gun. The wedge-shaped groove 9 with the screw 10 and the corresponding counter surface on the paint spray gun are so designed so that the flow cup can be attached to a rotation of the connecting piece 5 of about a quarter to half turn close to the paint spray gun. The connecting piece 5 is tightened for this purpose with its front end face 11 to a corresponding sealing surface within the paint spray gun. About the additional external thread 7, the flow cup can also be used for spray guns that have no matching to the Schraubkeilelement 8 connection, but a conventional connection with internal thread. Between the external thread 7 and the screw wedge element 8, an end-face stop face 12 for limiting the screw-in depth of the connecting piece 5 when using the external thread 7 for fastening the flow cup is provided on the connecting piece 5.

How special FIG. 2 shows, the wedge-shaped groove 9 is arranged in a shoulder 13 which extends approximately over half of the circumference of the connecting piece 5. The other half is free, so that a provided on the spray gun approach can get into the groove 9. The groove 9 is open at its front end, while it is closed at the rear end by a web 14 with a stop surface 15. This can prevent over-rotation of the quick release.

Within the connecting piece 5 is an in FIG. 3 shown paragraph 16 provided with an annular support surface 17. In paragraph 16 a known per se and therefore not shown filter can be used. The inner diameter of the shoulder 16 is slightly larger than the outer diameter of the hollow cylindrical guide portion 6. As a result, the shoulder 16 can also be used for stacking the lid 2. If a plurality of lids 2 are stacked on top of each other, the connecting piece 5 of the respective lower lid 2 engages with its hollow-cylindrical guide region 6 in the shoulder 16 of the respective upper lid 2 and is guided there.

For tight connection of the container 1 and the lid 2 is an in FIG. 4 illustrated four-speed quick-release thread with molded on the upper outer circumference of the container 1 external threads 18 and corresponding internal threads 19 provided on the cover 2. The quick-release thread is designed as a coarse thread with a pitch of 20 mm. As a result, the lid 2 can be screwed tightly to the container 1 by about a quarter turn. The four external threads 18 on the container 1 are distributed evenly over the outer circumference and according to FIG. 6 arranged such that the beginning 20 of the one thread 18 is located directly above the end 21 of the next thread 18. The distance x between the beginning 20 of the one thread and the end 21 of the other thread is 5 mm. How out FIG. 7 As can be seen, the thread is further formed in the embodiment shown as a trapezoidal thread with a flank angle of 30 °. The quick-release thread can also be designed as a round thread, pointed thread or with another suitable profile. The outer diameter d of the external thread is between 100 and 110 mm, preferably 104.6 mm. The core diameter D of the external thread is between 90 and 105 mm, preferably 101.7 mm. The width b of the threads on the outside is between 1.1 and 1.3 mm, preferably 1.27 mm.

On the inside of the lid 2 is also an in FIG. 5 shown circumferential wedge-shaped sealing web 22 integrally formed, which defines a wedge-shaped annular groove 23 for receiving the upper container edge 24 between its outer side and the inside of the lid 2. By getting in FIG. 5 upwardly wedge-shaped narrowing annular groove 23, the upper container edge 24 is pressed during the screwing of the lid 2 to the outside to the inner wall of the lid 2, whereby a tight-fitting connection is formed. The sealing web 22 has a sufficiently high height to catch a color still present in the lid when the lid is removed and to prevent overflow into the internal thread.

The invention is not limited to the embodiment described above and shown in the drawing. Thus, e.g. in the container also a collapsible insert for receiving the color are inserted.

Claims (10)

1. Gravity cup for paint spray gun with a cup-shaped container (1), a lid (2) which can be fitted on to the container (1), and a connecting part (3) for fastening the gravity cup to the paint spray gun, the connecting part (3) consisting of a connecting stub (5) which is formed directly on the cover (2) and comprises a threaded wedge element (8) for rapid connection of the gravity cup to the paint spray gun, characterised in that formed on the inside of the lid (2) there is a wedge-shaped sealing ledge (22) which bounds a wedge-shaped annular groove (23) for receiving the upper edge (24) of the container between its outside and the inside of the lid (2).
2. Gravity cup according to claim 1, characterised in that the sealing ledge (22) exhibits a sufficient height to catch any paint which is in the lid (2) when the lid (2) is removed.
3. Gravity cup according to claim 1 or 2, characterised in that the threaded wedge element (8) is formed by a groove (9) with a screw face (10) running obliquely in the circumferential direction.
4. Gravity cup according to one of claims 1 to 3, characterised in that the connecting stub (5) comprises an additional thread (7).
5. Gravity cup according to one of claims 1 to 4, characterised in that the connecting stub (5) comprises a lateral stop face (15) for limiting the depth to which it is screwed in when the threaded wedge element (8) is used for fastening the gravity cup.
6. Gravity cup according to claim 4 or 5, characterised in that the connecting stub (5) comprises an end stop face (12) for limiting the depth to which it is screwed in when the thread (7) is used for fastening the gravity cup.
7. Gravity cup according to one of claims 1 to 6, characterised in that a shoulder (16) with a supporting face (17) is provided in the inside of the connecting stub (5).
8. Gravity cup according to one of claims 1 to 6, characterised in that the container (1) and the lid (2) can be connected sealingly to one another by means of a quick-closure thread (18, 19).
9. Gravity cup according to claim 8, characterised in that the quick-closure thread (18, 19) is a quadruple coarse thread with external thread turns (18) on the upper outside circumference of the container (1) and corresponding internal thread turns (19) on the inside of the lid (2).
10. Gravity cup according to one of claims 1 to 9, characterised in that an insert can be placed in the container (1).

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