EP1659900B1 - Dispenser stick - Google Patents

Abstract

The invention relates to a dispenser stick (1) for storing and applying a pasty gradually removable stick compound from a cosmetic or otherwise product, such as for example a deodorant stick or glue stick. Said dispenser stick is provided with a cylindrical housing (1') comprising an upper dispensing opening, a closure cap (2) that hermetically seals the dispensing opening via a sealing lip (5), and a feeding plunger (7) that can be axially displaced inside the housing (1'). The dispenser stick (1) is characterized in that the feeding plunger (9) can only be displaced towards the dispensing opening and is blocked in the opposite direction and in that the closure cap (2) is configured as a double-walled structure that has an interior cap (3) that can be axially displaced relative to the closure cap (2). Advantageously, the housing (1') is double-walled with an exterior housing (9) that can be closed together with the closure cap (2) and with an interior housing (6) accommodating the stick compound, which can be displaced axially in the exterior housing (9).

Description

The invention relates to a dispensing pen for storing and applying a pasty abradable stick mass of a cosmetic or other product, such as a deodorant stick or glue stick, consisting of a pin-shaped housing with an upper discharge, a the airtight sealing opening via a sealing lip and a cap inside the housing axially displaceable tracking piston.

Dispensing pens for applying a pasty abradable product, such as deodorant sticks or glue sticks, are known in different designs. Dispensing pens are often in use, in which the pencil mass is displaced upwards out of the discharge opening by a supporting piston with the aid of a swivel foot with spindle or by a pusher device for use. For use, first remove the cap and then push the piston upwards. It is therefore here two separate manual operations required to bring the dispenser pen in application position.

In order to make a donor pen in its training and handling easier, GM 76 13 989 is proposed in German Utility Model seal the cap using a sealing lip against the housing so that when removing the cap by the negative pressure generated thereby, the pencil mass to a certain path length is pushed out of the housing. A rotary spindle or a pusher to raise the piston is no longer required. As a follower piston, the piston only has the task of completing the pin mass airtight downwards.

A disadvantage of this known dispensing pin is that when applying the pencil mass is pushed back into the housing. The only resistance against the back pressure is the static friction of the Nachführkolbens and depending on the pin mass on the Gehäuseinnenwandung. This static friction must therefore not be very high, since it must be possible, even when not in use of the pressed-out pin mass unscrew the cap back onto the housing, wherein the protruding pin mass is pushed back into the housing. When pushing back the pencil mass, it is unavoidable that the pencil mass is removed laterally at the upper edge of the housing.

Based on this known prior art, it is an object of the invention to further develop a dispensing pen of the type mentioned so that despite continued simple training and handling the adverse back pressure of the pencil mass is prevented.

This object is achieved with the characterizing features of claim 1, characterized in that the Nachführkolben is only displaced towards the discharge and displaceable in the opposite direction and the cap is double-walled with an opposite the cap axially displaceable inner cap. Advantageous embodiments of the invention are specified in the subclaims.

The inventive blocking of Nachführkolbens in the opposite direction to the discharge is advantageously prevented when applying the pencil mass, whereby an axial pressure on the pin mass is unavoidable, the pencil mass is pushed back into the housing. This blocking of Nachführkolbens is achieved for example by the fact that below the Nachführkolbens a locking spring is arranged, which digs against the inner wall of the housing and which is formed so that an axial displacement in the discharge remains possible.

Alternatively, according to an advantageous embodiment of the invention, the inner wall of the housing may be provided with a fine toothing or with fine locking grooves, in which the correspondingly shaped Nachführkolben digs and then also takes place by blocking the discharge direction.

Since the pin mass expelled from the housing for application can no longer be pressed back into the housing, the dispenser pin must also be closable with the unused pin mass ejected, the cap is designed to have a double-walled inner cap according to the invention. When screwing the cap onto the housing, the inner cap rests on the protruding pin mass and is then pushed axially into the cap when screwed on further. The inner cap is connected by a spring element with the cap so as to support, so that when renewed unscrewing due to the previously generated spring tension initially only the cap and then move the inner cap axially.

According to an advantageous embodiment of the invention, the housing of the dispenser pin is formed double-walled in addition to the cap. Within the outer housing, which is closable with the closure cap, an axially projecting from the outer housing axially displaceable inner housing for receiving the pin mass is arranged. The length of the protruding from the outer housing part of the inner housing corresponds to the length of the inner cap, so that when screwed cap of the bottom of the inner cap on the upper edge of the inner housing and the lower edge of the inner cap is seated on the upper edge of the outer housing.

A decisive advantage of this double-walled design of the housing is given when filling the inner housing with the - usually still liquid - pencil mass. That during the filling process only incomplete in the Inner housing inserted inner housing is completely inserted into the outer housing after completion of filling and curing of the pin mass, the pin mass and Nachführkolben, which rests on a protruding central cam of the housing bottom, remain unchanged in their position. The pin mass is thereby pressed inside the inner housing to the discharge opening, whereby the pin mass detaches from the inner wall of the inner housing. The usual by the filling process in known dispensing sticks pin mass on the inner wall of the housing is thus successfully prevented before the first use despite conventional filling and the pencil mass is then already easily vorschiebbar in the first application.

The advancement of the pin mass for application is done indirectly in the donor pen according to the invention by generating a negative pressure between the inner cap and the inner housing during the screwing of the cap. For this purpose, the inner housing is provided in its upper projecting region with an outwardly projecting annular sealing lip, which bears sealingly against the inner wall of the inner cap when the cap is screwed on. It seals a cavity formed between the inner housing and the inner cap downwards. When unscrewing the cap and axial displacement of the inner cap in the discharge direction upward, this cavity increases and the vacuum thus generated "pulls" the pen mass column a piece up out of the discharge. The possible path length of the axial displacement of the pin mass is adjustable in advance by appropriate design of the annular cavity between the inner cap and the inner housing.

The sealing lip according to the invention is arranged angled on the inner housing so that it acts as a check valve and is degraded by the closure of the outer housing through the cap, the resulting air pressure within the decreasing annular cavity by venting over the sealing lip to the outside.

Further advantages, features and characteristics of the invention, in particular the mode of operation of the dispensing pen according to the invention, are explained in more detail below on exemplary embodiments illustrated in schematic drawing figures.

Fig. 1

einen Spenderstift in einer Explosionsdarstellung,

Fig. 1a

Einzelheiten der Fig. 1,

Fig. 2

den Spenderstift der Fig. 1, in montiertem geöffneten Zustand,

Fig. 3a bis 3c

den Spenderstift der Fig. 1 in verschiedenen Gebrauchspositionen in einem Vertikalschnitt,

Fig. 4

den Spenderstift der Fig. 1, gefüllt in der Ausgangsstellung in einem Vertikalschnitt,

Fig. 4a und 4b

zwei verschiedene vergrößerte Teilausschnitte der Fig. 4,

Fig. 5 bis 9

den Spenderstift der Fig. 1 in verschiedenen Gebrauchspositionen in einem Vertikalschnitt,

Fig. 10

einen vertikalen Teilausschnitt eines Spenderstiftes mit Verzahnung zur Kolbensperrung,

Fig. 11 bis 13

das Gehäuse des Spenderstifts der Fig. 1 in verschiedenen Füllpositionen,

Fig. 14

einen vertikalen Teilausschnitt eines Spenderstiftes mit geöffnetem Gehäuseboden.

Show it:

Fig. 1

a donor pen in an exploded view,

Fig. 1a

Details of Fig. 1,

Fig. 2

the donor pen of Fig. 1, in the mounted open state,

Fig. 3a to 3c

1 in different use positions in a vertical section,

Fig. 4

1, filled in the starting position in a vertical section,

Fig. 4a and 4b

two different enlarged partial sections of Fig. 4,

Fig. 5 to 9

1 in different use positions in a vertical section,

Fig. 10

a vertical partial section of a dispensing pin with teeth for piston locking,

Fig. 11 to 13

the housing of the donor pen of FIG. 1 in different filling positions,

Fig. 14

a vertical section of a donor pen with open caseback.

In Figure 1, the individual parts of a dispenser pin 1 according to the invention are shown in their installation order in an exploded view, wherein from Fig. 1a details of Nachführkolbens 7 and the locking spring 8 in enlarged Representation are recognizable. Figure 2 shows the assembled housing 1 'with leaked pencil mass 10, on which the cap 2 is screwed.

The housing 1 'of the dispenser pin 1 consists of a closed bottom outer housing 9, in which the longer inner housing 6 is inserted from above. The inner housing 6 is tubular, so that the Nachführkolben 7 can be introduced with the locking spring 8 arranged underneath through the lower open end. In its upper, protruding from the outer housing 9 area the inner housing 6 is formed with two annular webs 15, between which the downwardly angled sealing lip 5 is attached. Below the annular webs 15 and at its lower end, the inner housing 6 is provided with further annular webs 16a, 16b, 16c, which support the inserted inner housing 6 to the outer housing 9 out. The upper part of the outer housing 9 is provided with an external thread 11, onto which the closure cap 2 with inserted spiral spring 4 and inner cap 3 is screwed for closing the dispensing pin 1.

In FIGS. 3 a, 3 b and 3 c, the donor pin 1 or the housing 1 'is shown in different use positions in a respective front view. Fig. 3a shows the dispenser pin 1 with screwed cap 2 in its initial position before use. In Fig. 3b, the closure cap 2 is screwed up by the path length x, whereby, according to FIG. 3c, the pin mass 10 has been expelled outward from the housing 1 'or the inner housing 6 by approximately the same path length x. The closure cap 2 is completely removed from the outer housing 9 and the pin mass 10 displaced outwards with the aid of the sealing lip 5 can be applied and removed.

In Figure 4, the dispensing pin 1 is shown with screwed cap 2 according to FIG. 3a in a vertical section. For a better overview, the important upper (Figure 4a) and lower (Figure 4b) are areas of Fig. 4 exposed in enlarged partial sections. In Figures 4, 4a and 4b, the donor pen 1 forming individual parts (see also Figs. 1 and 2) assembled ready for use. In the illustrated initial state, the Nachführkolben 7 is located below locking spring 8 just above a central cam 23 of the housing bottom 17 of the outer housing 9 with filled over Stiftmasse 10. The inner housing 6 sits with its lower annular ridge 16c on the housing bottom 17 and is connected via an annular bead 24 of the outer housing 9 with this through the web 16c in a snap connection. Toward the outer housing 9, the inner housing 6 is supported by this web 16c and by the two upper annular webs 16a and 16b. The cap 2 is completely screwed, wherein the inner cap 3, supported by the coil spring 4, seated with its lower edge 18 on the upper edge 19 of the outer housing 9 and with its upper bottom 20 on the upper edge 21 of the inner housing 6. The discharge opening 13 (see also Fig. 2) formed by the upper edge 21 is thus sealed airtight by the inner cap 3. The inner cap 3, whose inner diameter in its upper protruding part corresponds approximately to the outer diameter of the inner housing 6, widens in its lower part stepwise to the inner diameter of the closure cap 2. The step 22 formed by this extension serves as a support surface for the coil spring inserted into the closure cap 2 4. At the same time, a cavity 12, which is sealed downwards by the step 22, is formed by the step 22, which cavity is enlarged when the closure cap 2 is screwed on and generates the vacuum required for "sucking up" the pencil mass 10. In Figures 5, 6 and 7, this process of high suction of the pin mass 10 is shown separately in vertical sections.

In FIG. 5, relative to the starting position of FIG. 4, the closure cap 2 of the dispensing pin 1 is turned off upwards by the path length x. As a result, the cavity 12 is enlarged as shown and by the generated negative pressure the pencil mass 10 is pulled out of the inner housing 6 by the path length x. In the illustrated position, the sealing lip 5 has reached the lower end of the inner cap 3, so that by further twisting the cap 2 of the cavity 12 is vented and the pin mass 10 remains in the reached position.

In FIG. 6 (corresponds to FIG. 3c), the closure cap 2 is completely removed from the inner casing 6 and the pin mass 10 projecting beyond a length x above the upper edge 21 of the inner casing 6 can be removed.

As Figure 7 shows, after removal of the pin mass 10, the cap 2 is again partially screwed onto the outer housing 9 and the sealing lip 5 comes into sealing contact with the inner housing 6. Upon further screwing the cap 2 and reduction of the cavity 12 of the Cavity 12 resulting excess pressure degraded by the downward angled arranged sealing lip 5 to the outside.

With the figures 8 and 9, the function of the double-walled cap 2 can be illustrated. Shown is the case that the protruding from the inner housing 6 pin mass 10 has not been completely removed or consumed. When screwing the cap 2, the inner cap 3 is first guided downwards until it rests with its bottom 20 on the pin mass 10. This position is shown in FIG. 8. Upon further unscrewing the cap 2, the inner cap 3 can not follow their way down, because the locking spring 8 locks the Nachführkolben 7 and the pin mass 10 thus can not be pressed down. The inner cap 3 remains in its position and is axially displaced within the closure cap 2, counter to the spring force of the spiral spring 4, as shown in FIG. The annular cavity 12 remains unchanged, the sealing lip 5 remains at the lower edge 18 of the inner cap 3. With renewed unscrewing of the cap 2 causes the coil spring 4, that initially the inner cap 3 in their position remains. Due to the illustrated position of the sealing lip 5, no negative pressure is generated in the subsequent displacement of the inner cap 3 and a further pushing up of the pin mass 10 is omitted.

In the dispenser pin 1 of Figures 1 to 9, the blocking effect of the Nachführkolbens 7 was brought about by a arranged below the Nachführkolbens 7 locking spring 8. According to the invention, however, this blocking effect can also be brought about solely by a tracking piston 7 with a correspondingly functionally adapted inner housing 6 '. In Figure 10, which shows the lower part of the housing 1 'of a dispensing pin 1 with outer housing 9 and pin mass 10 in a vertical section in a vertical section, the inner wall of the inner housing 6' is formed with an annular fine toothing 14. In this toothing, the lateral edges of Nachführkolbens 7 dig so that here, too, an axial displacement of the Nachführkolbens 7 in the discharge possible, the opposite direction is locked.

According to the invention, the housing 1 'of the dispensing pin 1 may be double-walled. In the figures 11 to 13, the underlying this housing training principle of action for easy filling with pin mass 10 is explained in more detail below. Fig. 11 shows the empty before his filling with the pen mass donor pen 1 without cap 2 in a vertical section. The inner housing 6 is inserted into the outer housing 9 as far as the annular web 16b, so that the lower web 16c is arranged at a distance above the housing bottom 17 on an annular bead 24 of the outer housing 9 and the tracking piston 7 rests on the central cam 23 of the housing bottom 17 , In this position, the filling of the pin mass 10 takes place from above, wherein the filling at a distance below the upper edge 21 of the inner housing 6 of FIG. 12 ends. Subsequently, according to Fig. 13 after curing of the pin mass 10, the inner housing 6 is further inserted into the outer housing 9, wherein the upper annular ridge 16a is pressed into the outer housing 9 and now the lower annular Web 16c below the annular bead 24 is seated on the housing bottom 17, whereby the inner housing 6 is fixed to the outer housing 9 in a snap connection and an undesirable pushing up of the inner housing 6 is blocked in the cavity 12 at reduced pressure. Since the pin mass 10 due to the blocking of Nachführkolbens 7 - he sits on the central cam 23 of the housing bottom 17 on - this movement can not follow, moves the Stiftmasse10 within the inner housing 6 to the upper edge 21. The by the filling process on the inner wall the inner housing 6 possibly sticking pin mass 10 is thus released from the inner wall and is then easily easily displaced already in the first application.

Thus, with unchanged position of the Nachführkolbens 7 after completion of the filling, the inner housing 6 can be inserted to the housing bottom 17 in the outer housing 9, sitting in the embodiment of FIG. 11 to 13 of the Nachführkolben 7 in the filling position with distance to the housing bottom 17 on a central cam 23rd of the housing bottom 17. Alternatively, according to the invention, however, it is also possible, as shown in FIG. 14 in a vertical partial cutout, to omit the central cam 23 to form the housing bottom 17 'of the outer housing 9' with a central opening 25. The required for the filling distance of Nachführkolbens 7 to the housing bottom 17 'is ensured here by an annular web 27, which at the lower edge 26 of the central opening 25 flips up and serves as a support for the Nachführkolben 7. The advantage of this alternative embodiment of the outer housing 9 'with an open bottom housing bottom 17' is that through the central opening 25 of the Nachführkolben 7 is accessible from the outside. If, for example, the sealing lip 5 is damaged in the event of improper use, and as a result no negative pressure for dispensing the pencil mass 10 is more to be generated, then, alternatively, through the bottom open housing 9 'with the aid of a longer article the Nachführkolben 7 and thus the pencil mass 10 are pushed upwards.

The invention is not limited to the illustrated embodiments, but with regard to the design and the required individual components of the dispensing pin variably ausgestaltetbar, provided the features of the invention, the double-walled perform cap and train the Nachführkolben with a backstop is maintained.

LIST OF REFERENCE NUMBERS

1

dispenser stick

1'

Housing of 1

2

Cap of 1

3

inner cap

4

spiral spring

5

sealing lip

6.6 '

inner housing

7

tracking piston

8th

locking spring

9.9 '

outer casing

10

stick material

11

external thread

12

cavity

13

discharge

14

annular toothing

15

annular webs

16a-16c

annular webs

17, 17 '

caseback

18

lower edge of the inner cap 3

19

upper edge of the outer housing 9

20

upper bottom of the inner cap 3

21

upper edge of the inner housing 6

22

step

23

central cam

24

annular bead

25

central opening

26

inner edge of the central opening 25

27

annular bridge

x

Displacement (pin mass, inner cap)

Claims (14)

1. Dispenser stick (1) for storage and application of a pasty removable stick material (10) of a cosmetic or other product, for example a deodorant stick or glue stick, consisting of a stick-shaped housing (1') with an upper discharge opening (13), a closure cap (2) hermetically closing the discharge opening (13) by way of a sealing lip (5) and a tracking piston (7) axially displaceable within the housing (1'), characterised in that the tracking piston (7) is displaceable only towards the discharge opening (13) and is blocked in opposite direction and the closure cap (2) is of double-walled construction with an inner cap (3) axially displaceable relative to the closure cap (2).
2. Dispenser stick (1) according to claim 1, characterised in that the housing (1) is constructed to be double-walled with an outer housing (9) closable by the closure cap (2) and with an inner housing (6), which is axially displaceable in the outer housing (9), for reception of the stick material (10).
3. Dispenser stick (1) according to claim 1 or 2, characterised in that the inner cap (3) is connected, resiliently connected in axial direction, with the closure cap (2) by way of a spring element, for example a helical spring (4).
4. Dispenser stick (1) according to claim 1, 2 or 3, characterised in that the axial displacement of the tracking piston (7) opposite to the discharge direction is blocked by a blocking spring (8) clawing against the inner wall of the inner housing (6).
5. Dispenser stick (1) according to claim 1, 2 or 3, characterised in that the axial displacement of the tracking piston (7) opposite to the discharge direction is blocked by an annular fine toothing (4) arranged at the inner wall of the inner housing (6) or by fine blocking grooves in which the tracking piston (7) claws.
6. Dispenser stick (1) according to claim 1, 2, 3 or 4, characterised in that an outwardly projecting annular sealing lip (5) which is sealingly pressed against the inner wall of the inner cap (3) when the closure cap (2) is plugged or screwed onto the outer housing (9) is arranged in the upper region of the inner housing (6).
7. Dispenser stick (1) according to claim 6, characterised in that the sealing lip (5) so seals off an annular cavity (12) between the inner cap (3) and the inner housing (6) that on removal of the closure cap (2) and the thereby constrained enlargement of the cavity (12) an underpressure is produced therein which is of sufficient level to convey the stick material (10) by a predetermined travel length (x) out of the discharge opening (13) of the inner housing (6).
8. Dispenser stick (1) according to claim 7, characterised in that the travel length (x) of the axial displacement of the stick material (10) is settable beforehand by corresponding shaping of the annular cavity (12) between the inner cap (3) and the inner housing (6).
9. Dispenser stick (1) according to claim 6, 7 or 8, characterised in that the sealing lip (5) is arranged to be so angled over at the inner housing (6) that it acts like a non-return valve and on closure of the outer housing (9) by the closure cap (2) the arising air excess pressure within the reducing annular cavity (12) is relieved by ventilation outwardly via the sealing lip (5).
10. Dispenser stick (1) according to one or more of claims 2 to 9, characterised in that for filling with the stick mass (10) in the filling setting of the housing (1') the tracking piston (7) and the inner housing (6) are arranged at a spacing from the housing base (17), wherein a lower web (16c) of the inner housing (6) is seated on an annular bead (24) of the outer housing (9) and the inner housing (6) is supported on the outer housing (9) by the web (16c) and an upper annular web (16b).
11. Dispenser stick (1) according to claim 10, characterised in that in the filling setting of the housing (1') the tracking piston (7) is seated on a central dog (23) of the housing base (17).
12. Dispenser stick (1) according to claim 10, characterised in that the housing base (17') is constructed to be circularly annular with a central opening (25), the inner edge (26) of which is turned over in upward direction with an annular web (27) on which the tracking piston (7) is seated in the filling state.
13. Dispenser stick (1) according to claim 11 or 12, characterised in that at the conclusion of filling of the housing (1') with the stick material (10) the inner housing (6) with unchanged setting of the tracking piston is completely introduced into the outer housing (9) as far as the housing base (17), wherein the stick material (10) is detached from the inner wall of the inner housing (6).
14. Dispenser stick (1) according to claim 13, characterised in that the inner housing (6) is guided by its web (16c) over the bead (24) of the outer housing (9), whereby the inner housing (6) is fixed with the outer housing (9) in a snap connection and a later pushing up of the inner housing (6) is blocked in the case of underpressure in the cavity (12).

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