EP0282791B1 - Dispenser for viscous materials - Google Patents

Abstract

The dispenser has a housing (1), in which a piston (2), which can only be displaced in the emptying direction, is arranged and which has an outside handle for actuating a pump wall (6) which can be pressed in the direction of the piston for discharging the contents out of an exit opening (16) of a top cover (13) of the housing, which cover is connected via a small tube (9) to the pump wall. To achieve convenient and hygienic discharge, it is proposed that the actuating handle is designed as a key (T) which is displaceable transversely to the top of the cover and is arranged between the pump wall (6) and the cover (13), the displacement movement of which key, deflected by 90 DEG , is translated into a downward movement of the small tube (9) and thus of the pump wall (6). <IMAGE>

Description

The invention relates to a dispenser for pasty masses, with a housing in which a piston which can only be displaced in the direction of emptying is arranged and which has an external handle for actuating a pump wall which can be pressed in the direction of the piston for dispensing the contents from an outlet opening of a top cover of the housing, which ceiling is connected to the pump wall by a tube.

A donor of this type is known from DE-OS 34 16 999 of the applicant. There, the ceiling forms the actuation handle and at the same time the application area that spreads the pasty content, for which purpose the ceiling is dome-shaped. As a result of the application pressure, the piston is retightened over the level column. This tightening of the piston occurs primarily, i.e. before the remaining amount in the tube, which acts like a stopper, could compensate for the vacuum in the dispenser head. The pasty mass itself forms the valve.

In order for a plug connection that is favorable when the ceiling is formed as a wiping surface, with a simultaneous closure to specify the outlet opening, first proceeded according to the features of claim 1.

Furthermore, it is also provided according to the features of claim 2 that the operating hand no longer comes into contact with the output material when actuated in a technically simple, advantageous manner.

The further subclaims represent advantageous developments of the dispenser according to the invention.

As a result of such a configuration, a generic dispenser of increased utility value is created: the tube plug-connected to the ceiling with a stopper arranged on the opening side and connected to the tube, which tube is guided telescopically in a cylindrical tube part projecting downward from the ceiling, can be Put together well in terms of production technology and is also advantageous in terms of output technology. Furthermore, the unpleasant smearing of the actuating hand and thus also the actuating area of the dispenser is practically no longer given, in particular, by the features of claim 2. The acceptance is increased. The structural means are simple and functional. In this regard, the procedure is such that the actuating handle is now designed as a key which can be moved transversely to the top of the ceiling and is arranged between the pump wall and the ceiling, the displacement movement of which, diverted by 90 °, is translated into a downward movement of the tube and thus of the wall. The mechanics in this regard lie in a length section required anyway for the special valve function of the tube. This is therefore used to the best advantage. In a correspondingly space-saving manner, the further measure has the effect that the Sliding movement of the key is redirected by means of a fixed angle lever. Favorable leverage ratios with the shortest stroke distance can also be used here. A production-favorable training is achieved by a material uniformity between the button and the angle lever and by forming a film hinge between the two. Accordingly, sufficient tough or flexible plastic material is assumed. It also proves advantageous that the upper When actuated, the rim of the tube lifts off from the underside of the blanket and the outlet opening of the blanket is offset to the side of the tube, the upper end section of the tube being designed as a piston which sealingly runs in a cylinder formed by a collar on the underside of the blanket. In addition to stabilizing advantages - the collar has a stiffening effect with respect to the ceiling - it is also achieved with regard to the hydraulic system that a continuously increasing prechamber forms in front of the tube mouth when pressed out by means of the pump wall. The mass overlying the tube end is, on the one hand, squeezed out completely when the piston, which is designed as a tube, returns. On the other hand, the covering amount prevents the intake of false air. Using the above-mentioned features, a configuration in such a way that the tube protrudes into the outlet opening with an upper stopper creates a simple but effectively sealing closure device. With regard to the laterally offset media path, a second sealing point is also created in that the underside of the ceiling has a knob that closes and enters the mouth of the tube. It also proves to be favorable that the ceiling is formed by the bottom of a pot, the wall of which has an opening for the button and carries the pivot pin for the angle lever. With regard to the hinge pin, it can be a stub shaft which is formed in the same way on the angle lever and which can be assigned by means of a corresponding oblique cut of the end faces by means of the clip connection, or a separate axis. A cheap, captive assignment of the pot is achieved in that the wall of the same is clipped over an annular rib of the housing. An assignment of the button that avoids an exposed position and thus prevents accidental, unwanted dispensing of the filling material consists in the fact that it lies in a circular cutout of the pot wall. It is advantageous here that the outer surface of the button according to the Contour of the pot wall runs. The invention also proposes that one leg of the angle lever encompasses the tube in a fork shape and forms crowned pressure runners on the underside. As a result of the fork shape, the actuating handle can thus be slipped onto the side of the tube, that is to say the base forming the ceiling must be connected to the housing beforehand. The spherical shape of the pressure runners promotes smooth operation and takes account of the attachment that is displaced in the swivel plane. Furthermore, with regard to the smooth operation, there is also an advantageous solution in a rotation lock between the pot wall and the housing. Lateral loads can thus be effectively kept away from the operating handle. Specifically, such a rotation lock can be realized, for example, by means of ribs / groove engagement, which means would have to be aligned axially. A structurally simplified closure device also results from the fact that a plug projecting into the ceiling-side outlet opening is arranged in the ceiling-side mouth of the tube channel and is connected to the tube via radial gap-free radial webs. A stopper body so freely "suspended" in the dispensing path has a high sealing effect due to its arrangement which can be moved within limits; he can optimally adjust himself to tolerance deviations. It is washed around by the medium to be dispensed. In order to create good conditions in terms of flow technology and, on the other hand, to avoid any problems in terms of molding technology, the procedure is that the plug body has the shape of a double-cone frustum, from the base of which the radial webs originate. One truncated cone engages in the corresponding outlet opening in the closed position of the dispenser, while the other acts like a distribution cone, so that an equal supply of the medium to be dispensed takes place with respect to the annular gap sections. In this regard, it is advantageous that three radial webs arranged at equal angles are realized. To achieve a rotationally symmetrical structure of the dispenser body in To come in this area, the invention further suggests that the longitudinal axis of the plug body coincides with the longitudinal central axis of the dispenser. With regard to a precisely measured maximum output quantity, an advantageous embodiment is achieved by an end stop of the key. After exercising the full stroke, this strikes against corresponding end stop means on the housing. The latter are advantageously formed by the end faces of the dispenser facing the key side of two bearing tabs of the dispenser that support the key axis. The bearing rags therefore have an additional function.

Fig. 1

den erfindungsgemäß ausgebildeten Spender mit den Spenderkopf abdeckender Schutzkappe,

Fig. 2

den Schnitt gemäß Linie II-II in Fig. 1, die Grundstellung wiedergebend,

Fig. 3

einen der Fig. 2 entsprechenden Schnitt in der Betätigungsphase,

Fig. 4

den Schnitt gemäß Linie IV-IV in Fig. 2,

Fig. 5

die Draufsicht auf den Spender bei abgenommener Schutzkappe,

Fig. 6

die Ansicht gegen den Kopf des Spenders bei weggeschnittener Taste und freiem Einblick in das Innere des Spenderkopfes,

Fig. 7

den die Decke bildenden Topf in Einzeldarstellung,

Fig. 8

eine Unteransicht hierzu,

Fig. 9

einen der Fig. 2 entsprechenden Schnitt durch eine abgewandelte Ausführungsform des erfindungsgemäßen Spenders und

Fig. 10

eine weiter vergrößerte Draufsicht auf das Röhrchen.

The subject matter of the invention is explained in more detail below on the basis of an illustrative embodiment. It shows

Fig. 1

the dispenser designed according to the invention with the protective cap covering the dispenser head,

Fig. 2

the section along line II-II in Fig. 1, reflecting the basic position,

Fig. 3

2 corresponding section in the actuation phase,

Fig. 4

the section along line IV-IV in Fig. 2,

Fig. 5

the top view of the dispenser with the protective cap removed,

Fig. 6

the view against the head of the dispenser with the button cut away and a clear view of the inside of the dispenser head,

Fig. 7

the pot forming the ceiling in single representation,

Fig. 8

a bottom view of this,

Fig. 9

a section corresponding to FIG. 2 through a modified embodiment of the dispenser according to the invention and

Fig. 10

a further enlarged plan view of the tube.

The cylindrical housing 1 of the dispenser contains a piston 2. Its oppositely aligned edge lips 2ʹ lead to the cylindrical housing inner wall 1ʹ.

The housing 1 is closed at the bottom by a base part 3ʹ forming bottom part 3. The latter is formed on an inner collar 3 ', which extends with its end face so far into the housing 1 that it extends directly to the piston 2. Furthermore, the base part 3 has a central opening 4 for air compensation during the upward piston displacement.

The housing 1 is filled with the dispenser head pointing downwards. So that the air trapped between the piston 2 and the product can escape, the initial area of the inner wall of the housing 1ʹ is longitudinally grooved at 1ʺ.

The piston 2 can only be displaced in the direction of emptying (arrow x). For this purpose, it carries a so-called clamping module 5 in the form of a radially oriented prong 5ʹ having a star made of spring steel on its wide surface facing the end of the housing. Its diameter circumscribed by the spike ends is, brought into the plane, larger than the clear diameter of the housing 1, whereby the spike ends 5ʹ as inclined feet on the housing inner wall 1ʹ hook against the direction of the arrow x blocking.

At the end opposite the base part 3, the housing 1 carries a resiliently resetting bellows-like pump wall 6, which can be pressed in the direction of the piston 2, for dispensing the pasty mass. The pump wall is slightly curved upwards and merges peripherally into a clamping ring 7. This clamping ring, which is S-shaped in cross section, engages from below into an annular groove 8 in the housing 1. To achieve a rotation lock, the annular groove 8 has longitudinal ribs which dig into the elastic material of the clamped clamping ring leg.

The central area 6ʹ of the pump wall 6 is significantly thickened in relation to the concentrically adjoining highly flexible ring area, which then merges into the clamping ring 7, which is again thicker.

The central pump wall area 6ʹ forms an upwardly directed tube 9. The latter has a cylindrical jacket wall. The upper end section of the tube is designed as a piston 10. The latter runs axially displaceably in a cylinder 11. For the sealed guidance, the piston 10 carries ring ribs 12 formed on the jacket wall side. Two such ring ribs 12 are provided. For the self-centering assignment of the piston 10 during assembly, the inner edge of the cylinder is chamfered. A co-directional beveling of the ring ribs 12 also has a favorable association effect.

The cylinder 11 is formed on a ceiling 13 that overlaps the top opening O of the housing 1. It extends at an axial distance y above the pump wall 6. The space created in this way bears the reference symbol R. The axial distance y corresponds approximately to half the diameter of the housing 1. The ceiling 13 is a component, more precisely the bottom of a pot 14 clipped to the upper edge of the housing. Furthermore, the ceiling 13 is retracted slightly arched. It forms a stripping trough 15 in the center. In this stripping trough 15 there is an outlet opening 16 for the pasty mass. The diameter of the stripping trough 15 corresponds essentially to one of the Cover 13 formed on the underside of the collar, which holds the cylinder 11. The collar ends at the middle height of the space R between the ceiling 13 and the pump wall 6.

In the basic position (FIG. 2) of the dispenser, the front end of the piston 10 is supported by the restoring force of the pump wall 6 spring-loaded on the corresponding, horizontal inner surface of the cylinder 11, that is to say the ceiling 13. In this position, a stopper 17 molded onto the tube 9 projects into the eccentrically located outlet opening 16. The stopper is conical with a taper on the outlet opening side. The passage opening 16 also has a corresponding flank shape. In the basic position, the top of the stopper 17 is level with the base of the stripping trough 15. In addition to this seal, a second seal is also provided. This is formed by a likewise eccentrically located, hemispherical knob 18. The latter extends from the ceiling 13 and enters into the mouth 19ʹ of the tube 9, more precisely into an axially directed tube channel 19, the other mouth 19ʺ of which leads to the storage space of the pasty mass is open.

The dispensing path is released with the help of an operating handle provided in the dispenser head. Part of the same is a button T arranged in the space R between the pump wall 6 and the ceiling 13. This is displaced transversely to the longitudinal center axis zz of the dispenser, that is to say transversely to the top of the ceiling. Their horizontal displacement movement is diverted by 90 ° into a downward movement of the tube 9 and thus the pump wall 6 lying in the longitudinal central axis zz. The actuation position results from FIG. 3. As can be seen there, the key T continues into a horizontally mounted angle lever 20 . It is a right angle of different leg lengths. The storage is made in the apex of the angle leg. The axis bears the reference numeral 21. Here, molded-on stub axles can protrude beyond the angle leg width act that are clipped into openings in fixed bearing flaps. In the exemplary embodiment, however, the axis 21 is designed to be insulated (see FIG. 4). Your bearing tabs 22 start from the opening-side edge of the housing 1. The niche-like indentations 23 of the otherwise circular housing edge also result from FIG. 4. The bearing tabs 22 there adjoin rectangular sections that run back into the wall area. The niche bottom is closed. The receiving shaft between the two parallel bearing tabs 22 is designated 25. Its walls are relatively flexible so that they can rebound when the axis 21 is assigned. A centering or run-up slope 26 is arranged in front of the axle cavities.

Key T and angle leg 20 consist of a molded body, d. H. they are designed using the same material. A hinge point in the form of a film hinge 27 is implemented for converting the linear movement of the key T into the pivoting movement of the angle lever 20. In contrast, the central web 28 of the key T has a multiple wall thickness; Likewise, the legs 20ʹ and 20ʺ of the angle lever 20 are thicker than the point mentioned. Taking into account the freedom of movement of the angled leg 20 during the displacement, a wedge-shaped incision 29 extends from the underside of the key land.

For receiving the key T, the pot 14 has a window-shaped opening 30. This, like the actuating surface of the key body, has a circular design. It (30) lies in a wall-thickened area of the pot wall 14ʹ, so that there is an increased guide length for the displacement movement. In addition, the key T is in a circular niche 31 of the pot wall 14ʹ. However, the niche does not extend over the entire height of the pot wall; it ends at a distance from the lower edge of the pot. This creates a kind of window sill 32. The window sill surface affects the opening 30. Upward, the pot 14 merges into a clear transverse curve.

The outer surface of the T key is convex. Seen in the top view, the curvature contour corresponds essentially to that of the pot wall 14ʹ.

In order to keep the key T free of transverse loads, a rotation lock is implemented between the pot wall 14ʹ and the housing 1. The housing-side contribution consists of an axially directed rib 33. The latter engages in a form-fitting manner in an upwardly open longitudinal groove 34 or a shape-matched recess in the housing. As can be seen in FIG. 4, two such anti-rotation areas are taken into account in a diametrically opposed position. The same relief also results from the special design of the angle lever 20, more precisely its longer leg 20ʺ pointing in the direction of the tube. This leg 20ʺ comprises the cylindrical tube 9 fork-shaped. Tilting of the angle lever is also avoided from the corresponding fork wrap. The fork legs are designated 35. The latter form on their underside in the swivel plane rounded pressure runners 36. These slide under a shifting support point on the stiffened ring zone of the pump wall 6 (see FIG. 3).

The tipping point between the pot 14 or its pot wall 14ʹ and the neck-like tapered end section of the housing 1 results from FIGS. 2 and 3. There the neck has an outwardly directed annular rib 37, which is provided by a locking projection 38 on the inside of the pot wall 14 is undermined. Both functional parts form inclined flanks that facilitate clip assignment. The pot edge 14ʺ is supported on an annular shoulder 39 of the housing 1. These means can be identical to the anti-rotation lock 33/34.

The dispenser head carries a protective cap 40 which overlaps it. The latter is held in the clamping grip seat.

A peripheral viewing window 41 in the neck area of the housing 1 serves as an empty display. The piston that finally moves in front of this viewing window can be colored red, for example.

The function of the dispenser described is, briefly summarized, as follows: after the protective cap 40 has been removed, pressure is exerted on the button T in the direction of the arrow P. The inflowing force is translated into a linear stroke and deflected into a downward actuating pivot stroke, the fork legs 35 axially displacing the pump wall 6 in the direction of the piston 2. This happens against the restoring force of the pump wall. The piston 2 is supported by the clamping module 3 so that it cannot deflect downwards. The pasty mass thus pushes through the tube channel 19 of the tube, leaving the cylinder space through the outlet opening 16 to the outside into the stripping trough 15. As soon as the button T is relieved, negative pressure is generated inside the housing. The flexible pump wall 6, which returns to its basic position, consequently pulls the piston 2 in the direction of the arrow x over the filling material column. The corresponding provision has already been completed before the mass remaining in the tube or tube channel 19 could reach the inner mouth end 19 'as a "plug". The mass overlying the tube 9 and located in the cylinder space further favors this effect. On the other hand, the provision will also partially push it outwards.

The variant according to FIGS. 9 and 10 is fundamentally of the same structure, which is why the reference numbers, in part without repeated text, are used analogously. The difference to the previous embodiment is that in the ceiling-side mouth 19ʹ of the tube channel 19, the plug 17 is arranged centrally as the tube channel are. The stopper 17 projecting into the ceiling-side outlet opening 16 is connected to the inner wall of the tube via radial webs (17 (). The radial webs, viewed in the circumferential direction, leave between them annular gap sections 19ʺʺ (FIG. 10), passing through them, the medium to be dispensed flows around the plug body in order to collect above it in the prechamber of the cylinder 11. From there it leaves the outlet opening 16 of the pot 14 centrally.

As can be seen, the plug body has the shape of a double truncated cone. Its truncated cone protruding over the upper edge of the tube 9 forms the actual sealing plug 17. Its truncated cone pointing in the opposite direction and practically completely immersed in the interior of the tube, that is to say the tube channel 19, functions as a flow divider. The rotationally symmetrical structure leads to equal distribution relationships with respect to the individual annular gap sections 19ʺʺ between the radial webs 17ʹ. The latter start from the largest section of the stopper body, namely from the obtuse-angled edge of the back-to-back base of the double-cone frustum. The webs are essentially flush with the end face of the tube 9.

The radial webs 17ʹ are distributed at equal angles. A division into three is preferably used.

In the basic position, the bottom (ceiling 13) of the pot 14 extends in the cylinder area at a short distance from the corresponding end face of the tube 9. In this way, a certain restoring force of the plug body can be used, which thus engages the central inlet opening 16 with a preload, which is a forms the ring flank corresponding to the truncated cone angle. As can be seen, the longitudinal axis of the plug body and the longitudinal central axis zz of the dispenser coincide.

In order to achieve an actuation stroke H for the T button which guarantees the constant dosing quantity, both dispenser types have an end stop for the T button. The housing-side end stop is simply formed by the end faces 22ʹ of the two bearing flaps 22 facing the key, which form the receiving shaft 25 for the key T and the bearing receptacles for the key axis 21.

The design of the film hinge 27 differs from the film hinge 27 described above in that the cuts reducing the web width now originate not only from the underside, but from both sides of the leg 20ʹ of the T key. Otherwise, the plate forming the button is stiffened by molding on the top and bottom, the plate with the leg 20ʹ stiffening struts. These extend outside the area of the bearing flap end faces 22ʹ.

Claims (19)

1. Dispenser for pasty substances with a housing (1) in which is disposed a piston (2) displaceable only in the direction of emptying and which comprises an external handle for operating a pump wall (6) which can be pressed in the direction of the piston for discharging the contents from an outlet opening (16) in a top (13) of the housing, which top is connected by a tube (9) to the pump wall with a socket-type connection, wherein the tube (9) is constructed with an end sealing plug (17) which seals the outlet opening (16) from below, and wherein the tube (9) can be telescoped in cooperation with a tube portion (cylinder 11) starting from the top (13) and surrounding the outlet opening (16).
2. Dispenser according to claim 1, characterised in that the operating handle is designed as a push button (T) which is slidable transversely to the top and arranged between pump wall (6) and top (13) and of which the sliding movement, turned through 90°, is converted to a downward movement of the tube (9) and hence of the pump wall (6).
3. Dispenser according to claim 2, characterised in that the sliding movement of the push button (T) is turned by means of a stationarily mounted angle lever (20).
4. Dispenser according to one or more of the preceding claims, characterised by uniformity of material of push button (T) and angle lever (20) and formation of a film hinge (27) between the two.
5. Dispenser according to one or more of the preceding claims, characterised in that the upper mouth edge of the tube (9) lifts up when operated from the underside of the top (13) and the outlet opening (16) of the top (13) is laterally offset from the mouth (19) of the tube (9), wherein the upper end section of the tube (9) is designed as a piston (10) which extends sealingly in the cylinder (11), formed by the tube portion moulded integrally onto the underside of the top (13) after the fashion of a collar.
6. Dispenser according to one or more of the preceding claims, characterised in that the tube (9) extends by an upwardly projecting plug (17) into the outlet opening (16).
7. Dispenser according to one or more of the preceding claims, characterised in that the underside of the top (13) has a protuberance (18) which passes sealingly into the mouth (19') of the tube (9).
8. Dispenser according to one or more of the preceding claims, characterised in that the top (13) is formed by the bottom of a cup (14) of which the cup wall (14') comprises an opening (30) for the push button (T) and that the housing (1) carries the hinge pin (21) for the angle lever (20).
9. Dispenser according to one or more of the preceding claims, characterised in that the wall (14') of the cup (14) is snap fitted over an annular rib (37) of the housing (1).
10. Dispenser according to one or more of the preceding claims, characterised in that the push button (T) is located in a circle segment-shaped recess (31) in the cup wall (14').
11. Dispenser according to one or more of the preceding claims, characterised in that the outer surface of the push button (T) matches the contour of the cup wall (14').
12. Dispenser according to one or more of the preceding claims, characterised in that one arm (20'') of the angle lever (20) encompasses the tube (9) in a fork shape and forms convex pressure pads (36) on the lower side.
13. Dispenser according to one or more of the preceding claims, characterised by means (33/34) preventing rotation between cup wall (14') and housing (1).
14. Dispensed according to one or more of the preceding claims, characterised in that in the mouth (19') of the tube channel (19) in the top is disposed a plug (17) which extends into the outlet opening (16) in the top and which is connected to the tube (9) by radial webs (17') which leave annular gap sections (19'''') free.
15. Dispenser according to one or more of the preceding claims, characterised in that the plug body has the form of a double truncated cone, from the base of which the radial webs (17') start.
16. Dispenser according to one or more of the preceding claims, characterised by three equiangularly distributed radial webs (17'.
17. Dispenser according to one or more of the preceding claims, characterised in that the longitudinal axis of the plug body coincides with the longitudinal centre axis (z-z) of the dispenser.
18. Dispenser according to one or more of the preceding claims, characterised by an operating stroke end stop of the push button (T).
19. Dispenser according to one or more of the preceding claims, characterised in that the end stop on the housing side is formed by end faces (22') of two bearing lugs (22) which mount the push button shaft (21), which end faces (22') face towards the push button side.

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