EP0149797A2 - Plastic reaction container for small liquid samples - Google Patents

Abstract

A reaction vessel made of plastic for small amounts of liquid with a lid arranged by means of a flexible flat web provided in one piece with the opening has, opposite the flat web (5), a section (25) that can be gripped under on an edge flange (4) of the vessel opening (2) and on the lid (6) a hook-like extension (23) directed downwards in the closed position. When the lid is closed, this engages under section (25) and the flat web (5) is provided as a joint in its central region (12). The cover is provided with a cylindrical wall part which can be inserted into the opening and at whose end to be inserted into the opening a sealing lip (8) is arranged on the outside. The hinge provides a parallel guidance of the cover (6) through an edge web on the outwardly projecting edge (16) of the cover, the cover (6) being aligned by the sealing lip (8) arranged on the cylindrical wall.

Description

The invention relates to a reaction vessel made of plastic for small amounts of liquid with a lid arranged by means of a flexible flat web provided in one piece with the opening and an outwardly projecting edge which comes into contact with the opening edge of the vessel over a substantial circumferential section, and with a into the opening insertable cylindrical wall part, from which the outwardly projecting edge extends flange-like, and at the end to be inserted into the opening a sealing lip is arranged on the outside.

Also included is a reaction vessel in which the outwardly projecting edge has an edge web which runs downward at the edge edge, ie in the direction of the cylindrical wall part, and which comes into contact with the opening edge of the vessel. Reaction vessels with a lid are known from DE OS 17 73 331. Such closures have considerable advantages due to the captive cover.

From the aforementioned DE OS it is also known that the cover has a cylindrical wall part which can be inserted into the opening and from which the outwardly projecting edge extends in a flange-like manner. The outwardly protruding edge of the lid has a grip projection opposite the flat web.

It is also known on such vessels that the vessel opening is funnel-shaped at its edge on the inside upwards so that the cylindrical wall part can be smoothly inserted, which may come into contact with an essentially sealing lip on the essentially cylindrical seat surface outside the outer opening edge of the vessel .

An edge web as described above serves as a spacer and guide for the lid at the opening edge of the reaction vessel and contributes to the dimensional stability. Z

There is a problem with such reaction vessels, particularly with regard to the fact that these vessels are shipped with content, that the lid is not only held in the closed position by the engagement of a sealing edge, but that the lid is held securely in its closed position, ie also arbitrary lateral or other effects on the cover do not lead to such a load on the sealing area that leaks occur.

The invention is therefore based on the object of improving a reaction vessel of the type specified at the outset in such a way that, with the possibility of easy closing and also a correspondingly easy opening by hand, it should be difficult to open by internal pressure and bring about an additional securing of the closed lid becomes.

This object is achieved in that an edge flange at the vessel opening opposite the flat web has a graspable section and on the lid a hook-like extension is arranged in the closed position downwards, which engages under the section when the lid is closed, and that the flat web in its central region is provided as a joint.

Such hakenarti he ^g shutter is automatically when the lid due to an external slope of the hook-like projection engages. The hook-like approach is designed so that it is the graspable Section around the edge flange at the vessel opening tightly and at the same time a side guide for the lid is created.

The special design of the flat web as a joint results in the possibility of lateral mobility under the guidance of the sealing lip in the cylindrical wall part.

The additional securing by the hook-like approach leads to a relief in the sealing area, i.e. on the sealing lip of the closed lid, that lateral movements can be absorbed to a certain extent. In this regard, the guidance through the flat web on the one hand and the engagement of the hook-like attachment on the other hand have a stabilizing effect, but the joint permits adjustment.

In the particularly preferred embodiment, a parallel guidance of the cover through the edge web is provided in free transverse mobility by the joint designed as a double joint and the height of the parallel guide is matched to the length of the hook-like extension, and the alignment of the cover is carried out while maintaining the seal by the cylindrical wall part arranged sealing lip.

This is further improved in that the flat web has in its central region a projection which projects inwards in the bent state and which forms a spacing and parallel guidance of the joints of the double joint formed by the adjacent sections of the flat web.

This parallel guidance precludes the fact that the bending of the flat web results, on the one hand, in lateral forces on the cover, and on the other hand also influences the inclination of the cover, the bending area being particularly defined.

In an expedient embodiment in the sense of parallel guidance, the flat web has a lower thickness in its central region than at the adjoining sections towards the lid and towards the vessel, a projecting step toward the vessel opening being provided at the section towards the vessel. The edge of this step can form a guide for the ledge.

This results in an articulated area that can be easily bent together and defines the bending point of the flat web, so that the lid is also relieved.

Particularly advantageously, the edge web parts on the flat web have a bulge located at the end of these edge web parts, which bulge against the opening edge flange of the vessel when the lid is in place. This creates a system for the flat web bent together when the lid is closed and directly for the lid insert on the one hand, which not only contributes to the parallel guidance of the closed lid, but also keeps the engagement of the hook-like extension on the graspable section. Here, the bulge can be dimensioned such that in connection with the spacer in the central region of the flat web, a certain pretension with respect to the engagement of the hook-like approach is achieved, wherein an axial alignment of the lid is ensured in the closed state.

The projection on the flat web advantageously has a central recess, so that the system is only provided in the edge areas. This simplifies the adaptation by reducing the contact areas.

In a further embodiment, in which the lid edge has a grip projection opposite the flat web, it is preferred that the hook-like projection is provided on the edge of this grip projection and is directed downward and that the edge web passes through on the edge of the projection on which the hook-like projection is arranged . In this way, while maintaining a certain elasticity of the grip projection, its guide stability for the hook-like approach is improved and stabilized.

The resilience of the grip projection with a side-stable design is advantageously further improved by an opening in the grip projection, so that the end with the hook-like attachment is held by at least two web pieces forming the projection.

The hook-like extension is expediently stiffened by at least one rib toward the grip projection. When arranged internally, this rib also forms a guide to the graspable section at the opening edge of the vessel due to the stiffening of the hook arrangement.

With the inclusion of a further second rib, an advantageous, side-stable design of the hook-like extension lies in an essentially U-shaped stiffening with two ribs. This practically creates a box profile.

In another advantageous embodiment, a middle rib is arranged on the outside. The hook-like approach has a substantially parallel to the lid axis supporting part that runs with the lid closed directly on the outer edge of the graspable section and tightly surrounds the adjacent portion of the edge flange.

However, it is also included in an expedient embodiment that three ribs are provided.

Particularly in the case of a side stable design of the hook-like projection, by a box-like in a cut design of the stiffener, is a useful embodiment is that the hooklike extension and the under tangible _'section come to the engaging side into engagement with the undercut. This improves the fit, in particular of the hook-like attachment which is designed to be stable on the side.

An expedient embodiment lies in the fact that the hook-like attachment and the portion that can be gripped under are concavely curved and form a mutually hook-shaped connection. This still allows certain evasive movements.

In another advantageous embodiment, the engagement surfaces on the hook-shaped attachment and the portion that can be gripped under consist of surfaces that are at an angle to one another in the open state. This also improves the engagement, in particular in a direction radial to the vessel axis.

A reaction vessel with a crenellated formation of spaced-apart projections p on the underside of the edge web, which is included in the preferred embodiment, has the feature that the hook-like extension is guided in a gap between two battlements in the closed state of the vessel and that the gap the width of the hook-like approach is adapted. This ensures firm engagement.

In an advantageous further embodiment, the engagement part of the hook-like extension (with the lid closed) and the outer edge of the portion that can be gripped under have concentrically curved edges concentric to the central axis of the vessel, which contribute to stabilizing the lid seat.

An advantageous embodiment lies in the fact that the edge of the graspable section on the edge flange and the hook part are each curved concentrically to the axis of the vessel when the lid is closed. The guiding effect is particularly effective in an embodiment in which the hook-like extension and the graspable section on the engagement side are each concavely curved and there is a mutual hook-shaped connection.

The middle cover wall can be perforated in a manner known per se, for example also in the form of a film. However, it is preferred that this cover wall is arranged within the cylindrical wall part, but in the vicinity of the upper edge of this cylindrical wall part when the cover is closed.

An advantageous embodiment provides that a substantially cylindrical seat surface is provided for the sealing lip on the cylindrical wall part of the cover and in its area the vessel wall is made thinner up to the opening than at the adjoining section. An adaptation to the sealing lip is also possible using the parallel guidance mentioned between the parts that come into engagement.

It is useful to include that the vessel is designed in the region of the opening with an inner edge that widens conically upwards, which facilitates the introduction with a tight fit.

• Fig. 1 eine Vorderansicht eines Reaktionsgefäßes mit geöffnetem Deckel im Schnitt längs der Linie I-I in Fig. 2 in vergrößertem Maßstab;
• Fig. 2 eine Draufsicht auf Fig. 1;
• Fig. 3 eine Schnittansicht entsprechend Fig. 1 des oberen Gefäßteiles bei geschlossenem Deckel;
• Fig. 4 einen Schnitt längs der Linie IV-IV durch Fig. 1;
• Fig. 5 eine der Fig. 3 entsprechende Ansicht einer anderen Ausführungsform;
• - Fig. 6 eine Ansicht im Schnitt längs der Linie VI-VI in Fig. 5;
• Fig. 7 eine Teildarstellung einer anderen Ausführung aus Fig. 2, den rechten ausgebrochenen Ausschnitt von Fig. 2 zeigend.

The invention is described below with reference to exemplary embodiments which are illustrated in the drawing. The drawing shows:

• Figure 1 is a front view of a reaction vessel with the lid open in section along the line II in Figure 2 on an enlarged scale.
• Fig. 2 is a plan view of Fig. 1;
• Fig. 3 is a sectional view corresponding to Figure 1 of the upper part of the vessel with the lid closed.
• 4 shows a section along the line IV-IV through Fig. 1.
• 5 shows a view corresponding to FIG. 3 of another embodiment;
• 6 is a view in section along the line VI-VI in FIG. 5;
• FIG. 7 shows a partial illustration of another embodiment from FIG. 2, showing the cut-out section from FIG. 2 on the right.

The reaction vessel 1, which is closed at the bottom, has an upper opening 2. Its inner edge 3 widens conically upwards. The opening edge is provided with an edge flange 4. A flat web 5 extends from this edge flange and is formed in one piece with a cover 6. The lid has a cylindrical wall part 7 which, according to FIG. 3, can be attached in the vessel opening 2 and, at its lower edge, with an outwardly projecting sealing lip 8, provides the seal on an essentially cylindrical seat surface 9 of the vessel. In the area of the seat 9, the vessel wall is made thinner than in the adjoining section, so that tolerances can be compensated for by adaptation.

The middle cover wall 10 is sunk into the cylindrical wall part. However, it is closer to the upper edge 11 of the cylindrical wall part than to the sealing lip 8. The distance to the upper edge 11 is approximately one third of the distance to the sealing lip 8.

The flat web 5 forms a joint in its central region 12, in which it is bent together. It has an inwardly projecting projection 13 during the bending process, which separates the joint parts 31, 32 (FIG. 3) from one another, which together form a double joint. The central region 12 of the flat web 5 is made weaker than the adjoining sections 14, 15 towards the cover. This defines the bending. In addition, the lid around the cylindrical wall part 7 has a flange-like outwardly directed edge 16, from which, when the cover is closed, an edge web 17 extends downwards, which in the parts in which it runs makes contact with the edge flange of the vessel opening. In an. the parts of which have a stabilizing effect on the edge bridge. The support on the edge flange of the vessel opening takes place in an area 18 in which the edge web runs essentially concentrically to the lid axis. This area is adjoined by edge web parts 19, 21 which run at the edges of the flat web 5, but which end at a distance from the projection 13 or at the border of the central area 12.

This edge web also extends along the edge of a grip projection 22, on which a hook-like extension 23 directed downwards when the lid is closed is arranged. With its hook part 24, this engages under a section 25 that can be gripped under. On the edge flange 4 at the vessel opening 2 in the embodiment described in FIGS. 1-4, the hook-like extension 23 has on its inside a central rib 26 for stiffening or, as shown in FIG. 7 emerges, two ribs 52, 53, which practically form a type of box profile for stiffening the hook-like extension 23 with the hook part 24. In this connection, reference is also made in advance to the ribs 43-45 in FIG. 6, which also bring about special stabilization in the design of the engagement parts.

The lateral guidance is further improved in an advantageous embodiment of the vessel in that, as shown in FIGS. 2, 4 and 6, underneath the edge flange 4 there are provided protrusions in the form of crenellations arranged with a mutual space between them two of which are denoted by 46, 47, namely the two crenellations which are adjacent to the hook part 24 which engages between these two crenellations of the crenellated crown. 4 shows, for example, parts of the two crenellations 48, 49 which are visible in the sectional view on both sides of the flat web 5 if such crenellations are arranged, as is shown more clearly in FIG. 2. The battlement 46 can be seen in FIG. This also improves the guidance of the cover 6, which is centered in the sealing area on the lip 8. The radial mobility between the crenellations 46 and 47 is advantageous. In one embodiment, a certain lateral mobility is also allowed between them.

1 and 3, the handle projection 22 has a central opening 27 which improves the elasticity of the handle projection and divides it toward the hook-like extension 23 into two web pieces 28, 29 which converge towards one another.

The edge web 17 can be interrupted on both sides of the handle projection. However, the edge web expediently goes through because, given the small dimensions, it leaves sufficient elasticity in the grip projection. The part of the edge web 32 which remains on the outer edge of the grip projection solidifies this in the outer part, so that there is particular stability, in particular at the root of the hook-like extension 23.

The reinforced section 14 of the flat web 5 on the vessel 1 has a step 33 projecting towards the edge. From FIG. 3 it can be seen that with the lid closed, on the one hand the edge of this step 33 and on the other hand the adjacent ends of the web parts 19, 21 above and below can form a guide on the projection 13 'if an additional load occurs. These parts also serve to determine the individual joints of the double joint.

In the advantageous embodiment, the web according to FIG. 4 has a central recess 34, which, except for the facing side of the web, is designed in the form of a rounded portion, so that the described guidance by the projection takes place, for example, only at its edge sections 35, 36 in the area of which the edge web parts 19, 21 are also arranged. The edge web parts 19, 21 on the flat web have on their At the end towards the cover there is a bulge 37, 38, which can also be formed by the transition to the edge web parts 17 enclosing the cylindrical wall part 6 of the cover. This increase or bulge comes in accordance with FIG. 3 with the lid closed directly with the edge flange 4, so that an additional guidance of the lid is achieved directly at the edge of the opening 2, apart from the parallel guidance by the projection 13 or its end parts in the area the turn.

5 and 6, the same parts are designated by the same reference numerals. Differences are in the area of the grip projection 22. In this embodiment, the hook-like extension 23 has a support part 39 which runs essentially parallel to the cover axis and which closely encloses the section 40 of the edge flange with the section 25 which can be gripped under. Since the latter section is provided on the underside of the edge flange 4, the edge of the graspable section, which is denoted by 41 in FIG. 5, runs concentrically to the axis of the vessel. Accordingly, the support part 39 is curved when the lid is closed, and also the hook part 42. The engagement surface of this hook part and also the portion 41 that can be gripped under are concavely curved on their respective engagement sides, so that a reciprocal hook-shaped connection is present, which is also the case with a concentrically curved design of the engagement parts contributes to a special lateral guidance, in cooperation with the battlements 46, 47, which adjoin and form a stabilizing element in connection with the double joint, but with the proviso that no overdetermination with the Cover in the closed state centering sealing lip 8 is carried out. However, there is protection, in particular guidance in the event of lateral impacts from the outside in order to maintain the seal.

Because the supporting part 39 is provided directly on the edge flange 4, in this embodiment there are ribs on the outside of the hook-like extension 23. This embodiment is a design with three ribs 43-45, which is a box-like or honeycomb-like structure for the hook-like structure Form approach 23 on the handle. The hook-like approach is particularly stable on the side of the hook projection, but can be deflected in the plane of the cover wall. The advantage here is that the outer ribs 44, 45 in conjunction with the battlements 46, 47 can form a system.

If the concave curvatures on the hook part 24 and the graspable section 41 are shown in FIG. 5, it is noted that also in the embodiments according to FIGS. 1-3 the hook part 24 and the graspable section with surfaces which are angled to one another in the open state of the cover 50, 51 are executed so that cohesion is improved. This also creates an undercut.

Claims (12)

1. reaction vessel made of plastic for small amounts of liquid with a lid (6) arranged by means of a flexible flat web (5) provided in one piece with the opening and an outwardly projecting edge (16), which in the closed state has a substantial circumferential section with the opening edge of the vessel (1) comes into contact, and with a cylindrical wall part (7) which can be inserted into the opening (2) and from which the outwardly projecting edge (16) extends flange-like, and at the end to be inserted into the opening (2) a sealing lip on the outside (8) is arranged, characterized in that an edge flange (4) at the vessel opening (2) opposite the flat web (5) has a graspable section (25, 41) and on the cover (6) has a hook-like extension directed downwards in the closed position (23) is arranged, which engages under section (25, 41) when the lid is closed, and that the flat web (5) is provided as a joint in its central region (12). A reaction vessel according to claim 1, wherein the outwardly projecting rim is downward at the edge, i.e. Has edge web running in the direction of the cylindrical wall part, which comes into contact with the opening edge of the vessel, characterized in that a parallel guidance of the cover (6) through the edge web (17) in free transverse movement through the joint designed as a double joint (31, 32) and the height of the parallel guide is matched to the length of the hook-like extension (23), and the alignment of the cover (6) is provided by the sealing lip arranged on the cylindrical wall part. 3. Reaction vessel according to claim 2, characterized in that the flat web (5) in its central region (12) has a projection (13) which projects inwards in the bent state and which has a spacing and parallel guidance of the adjacent sections of the flat web ( 5) formed joint of the double joint (31, 32). 4. Reaction vessel according to one of claims 1-3, characterized in that the flat web (5) in its central region (12) is less thick than at the adjoining sections (14, 15) to the lid (6) and to the vessel (1 ) has, whereby a projecting step (33) in the direction of the vessel opening is provided on the section (14) towards the vessel. .5. Reaction vessel according to one of claims 1-4, characterized in that the on the flat web (5) Continuing edge web parts (19, 21) have a bulge (37, 38) at their end, which lie against the opening edge flange (4) of the vessel when the lid is in place. 6. Reaction vessel according to one of claims 1 to 5, on which the lid edge has a handle projection opposite the flat web, characterized in that the hook-like projection (23) is provided on the edge of this handle projection (22) and is directed downward and that the edge web ( 17) goes through at the edge of the attachment, on which the hook-like attachment (23) is arranged. 7. Reaction vessel according to one of claims 1 to 6, characterized in that the hook-like extension (23) by at least two ribs (43 - 47) has a substantially U-shaped stiffening of the hook-like extension to the handle projection (22). 8. Reaction vessel according to one of claims 1 to 7, characterized in that the hook-like extension (23, 42) and the graspable section (25, 41) come into engagement with an undercut. 9. Reaction vessel according to claim 8, characterized in that the hook-like projection (42) and the graspable section (41) are each concave and form a mutually hook-shaped combination. 10. reaction vessel according to one of claims 1 to 9, with a crenellated formation of spaced projections on the underside of the edge web, characterized in that the hook-like extension (23) is guided in the closed state of the vessel in an intermediate space between two crenellations (46, 47) and in that the intermediate space is adapted to the width of the hook-like extension (23). 11. Reaction vessel according to one of claims 1 to 10, with a perforated central lid wall, characterized in that a substantially cylindrical seat surface (9) is provided for the sealing lip (8) on the cylindrical wall part (7) of the lid and in its area the vessel wall to the opening (2) thinner than on the adjoining section and that the vessel in the region of the opening (2) is designed with an upwardly conically widening inner edge (3). 12. Reaction vessel according to one of claims 1, 2, 6, 8 and 10, characterized in that the edge of the graspable portion (25, 41) on the edge flange (4) and the hook part (24, 42) each with the lid closed concentrically Axis of the vessel are curved.

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