DE1181121B - Plastic container with attachable lid - Google Patents

Description

Plastic container with attachable lid The invention relates to a plastic container made by injection molding or pressing with attachable Lid, which has approximately the same cross-sectional profile as the edge of the vessel Surface contact sealing against the inner and outer edge surface of the reinforced Rests on the edge of the vessel; the lid is provided with at least one cam that the Reinforced, outwardly protruding container edge engages in a latching manner.

The invention is based on the object of such a container to make it airtight and watertight and one of the physical Properties of the plastic largely independent of these properties to create at least easy-to-adapt, form-fitting locking, which can be opened without difficulty. The design of the closure means should be such that the pressing tools, namely the die and male mold, during the pressing process cannot be damaged. For this it is necessary that the against each other to be moved tool parts of the male mold and die during the pressing process as possible no direct surface contact received.

To plastic containers of the type mentioned are depending on the Good to be packaged different requirements. So should containers for Certain foods, especially branded items, such as fats, have their original packaging represent, which have a kind of lead seal, so that they can be recognized at any time is whether the container has already been opened for the first time. Place these containers so so-called lost packs are, which after opening no longer have an original closure obtain.

A plastic container suitable for packing fats and the like should generally have maximum stability with low wall thickness, so that it can withstand great pressure and shock loads that it is exposed to during transport and exposed during storage. The closure elements should depend on the shape of the container and designed according to the type of plastic and automatically be tension-equalizing. The lid should also be designed so that he can be pressed onto the container with mechanical devices.

In terms of production engineering, it is required that the container Can be produced with simple injection and pressing tools and with low material requirements is cheap to manufacture as a mass-produced item.

There are already containers of various shapes and sizes Materials known.

In a known container of the type mentioned at the outset, is used as a cam a projecting edge running around the container is provided to reinforce it Reaches under the edge of the container. Opening the container is made more difficult because the lid cannot be removed without deforming the entire edge of the container.

In various known embodiments of containers with lids Arched lid edges are provided, which form the bead-shaped edge of the container grip from above or below. In these embodiments, the contact pressure the edge of the lid caused exclusively by the curved shape of the edge. A seal between the lid and the container wall can therefore only be achieved if when the lid is completely made to measure. Apart from that -difficulties in making the container and the lid will also occur a full seal is not achieved for a long period of time because the sealing Contact surface is relatively small.

With the construction of the plastic container according to the invention Attachable cover these disadvantages are avoided, and it can all initially mentioned requirements that are usually placed on such containers, to be met.

In the case of a plastic container made by injection molding or pressing with an attachable lid of the type mentioned at the outset, according to the invention, has the edge of the container facing surface of the peripherally extending cam has the same profile as the boundary surface of the container edge tapering towards the thinner cross-section of the container wall and lies behind it with surface contact, and the cross-section the edge of the lid is less above the cam than in the area of the container edge engaging cam.

The inventive design of the container and the lid is a tight fit of the lid edge on the container edge regardless of the Shape of the container reached, and the opening and closing of the container is due of elasticity the edge of the lid, especially in the area of the cams, much simplified. Since the cams reach under the edge of the container, they can be designed in cross-section so that the entire cover with simple pressing tools can be produced.

It is expedient to have an outwardly directed cam per se on a cam known handle applied.

This handle allows in connection with the elasticity of the At the edge of the cover in the area of the cam, the cover can be pulled off slightly. The dimensioning the handle and the cover cross-section above the cam can be such, that broken off at a predetermined bending moment of the cam with the handle will. In this version, the lid can be used to close original packaging can be used that clearly show a change after opening should be recognizable.

A particularly favorable elasticity and easy production under Protection of the tools is achieved if, according to a further feature of the invention the material cross-section of the overlapping lid edge up to the approach of the cam is returned uniformly, preferably down to the cross section zero.

To ensure a completely airtight and watertight seal from both outside in the direction of the inside of the container and vice versa, from the inside of the container outside to get, according to a further feature of the invention, the lid has a against the upper inner surface of the container on the sealing edge, which is in the The inside of the container is drawn in and by a rounding with a subsequent web part is pressed against the upper part of the inner surface of the container under pretension.

According to one embodiment of the invention, in the area of Clamping cams reinforcements of the wall thickness of the cover part can be provided up to are led to the top edge of the lid and thus a reinforced seating area form for attacking the stamp of a locking machine. A weakening of the Edge cross-section in the area of the cam takes place in that on both sides of the Handle or the cam are provided in the edge notch cuts. When bending up the handle can thereby be torn open in the desired manner of the clamping cam.

The subject matter of the invention requires closing the container no centering by putting on the cover. The container is simple manufacture by injection or compression molding.

A particular advantage is that they are relatively hard, inelastic Plastics can be used.

The invention is illustrated in more detail with reference to the drawings illustrated embodiments explained. It shows F i g. 1 is a plan view of a container closed with a lid with an approximately triangular plan, F i g. 2 shows a side view of the container according to FIG. 1, FIG. 3 shows a longitudinal section the line III-III in Fig. 1, F i g. 3 a shows a section along the line IIIa-IIIa in Fig. 1, Fig. 3b a section along the line III b-III b in Fig. 1, F i g. 4th an enlarged illustration of a partial view according to FIG. 2 on the cam with Spring bar, FIG. 5 is a plan view of a round one closed with a lid Container, F i g. 6 shows a side view of the container according to FIG. 5, FIG. 7 shows a section along the line VII-VII in Fig. 5, F i g. 8 shows a section along the line VIII-VIII in Fig. 5, Fig. 9 a section along the line IX-IX in Fig. 5, F i g. 10 is a plan view onto a round container with a differently constructed lid, FIG. 11 is a side view of the container according to FIG. 10, F i g. 12 shows a section along the line XII-XII in Fig. 10, Fig. 13 shows a section along the line XIII-XIII in FIG. 10, FIG. 14th a section along the line XIV-XIV in FIG. 10.

The container 4 for receiving the goods to be packaged carries at the top a reinforcing edge 3, the outer surface 3 a and inner surface 3 b of correspondingly guided wall parts of the cover 2 are tightly enclosed. The im approximately right angle to the obliquely outwardly extending surface 3 a lying lower Boundary surface 3 c of the reinforcing edge 3 of the container 4 is used as a contact surface for the intended clamping cams 5 ", 6", 7 "or

5, 6, 7 (Fig. 5 to 9) of the cover 2 is formed. This lid 2 initially has an edge that extends over the outside of the reinforcing edge 3 of the container 1, the lower end of which is reinforced by a rib 16. To the inner side of the container 3b closes a sealing edge 9 of the guided towards the interior of the container Cover 2, which forms an extended sealing line in the area of the section A '.

The sealing edge 9 of the lid 2 is closed in a rounding 10 by the a web 11 guided lid with bias against the upper part of the container 2 pressed and thereby receives a full contact on the reinforcement edge 3 of the container. To increase the pressure on the edge 9, a web 20 can be placed between the parts 9 and 11 may be provided.

The actual closing and opening mechanism of the container is formed by the clamping cams 5, 6, 7. They reach behind the reinforcement edge 3 of the container 4, which has a projection 15, the cross section of which is approximately right triangle is. The largest side of this approach 15 is through the preferably perpendicular connecting line formed between the points S, S ', wherein S in the F i g shown in cross section. 3 to 3b and 7 to 9 the upper outer end point of the container 4 and S 'is the point of intersection of the point of intersection of the point emanating from this extreme end point Plumb line with the lower limit line 3c. The intersection point S 'coincides approximately with the outermost end point of the clamping cam 5 or 6 or 7 together.

In the case of the FIGS. The embodiment illustrated in FIGS. 1 to 4 is any Cams 5 ", 6", 7 "arranged on a resilient web 21, which by weakening the Edge cross-section in the area 22 above the cam 5 ", 6", 7 "and weakening the rib 16 is formed on the side of the cam.

To ensure that the pressing tools work extremely gently, which form these positive locking means to achieve, is according to a further feature of the Material cross-section of the overlapping lid edge 1 up to the approach 23 (Fig. 3b) of the cam 5 ″ evenly, preferably returned to the zero cross section. This is achieved in a simple manner in that the outer surface 3 a of the vessel rim 3 with respect to the outer surface la of the overlapping lid edge 1 runs at an angle in such a way that that both surfaces 3 a, la are one above the other at an acute angle, the vertex of which 23 (Fig. 3 b) preferably on the approach of the cam 5 "or

6 ", 7" lies.

Since the outer edge 3 a of the edge 3 of the vessel 4, despite the weakening, albeit with a decreasing cross-section, completely covered with the material of the lid there may be direct contact between the male and female molds that make up this fastener of the lid do not take place. In the embodiment shown in FIGS a triangular box are the form-locking means 5 "to 7" in the form of cams arranged on the resilient web 21, which above these cams 5 ", 6", 7 "through the weakening 22 of the cross section of the lid edge 1 except for a narrowest cross section is formed in the area of the approach of the cam 5 ", 6", 7 ".

Depending on the type of material, the design of the container and the shape of the Edge itself can be designed individually, the spring bar 21, such that a desired, predetermined elasticity is achieved, so that the cam to a desired Piece from its locking position (F i g. 3 b) can be resiliently bent.

According to a further feature, this is associated with a cam Tongue 24 reached, which in the embodiment of FIGS. 1 to 4 is symmetrical between the two cams 5 ", 6" at the pointed end of the approximately triangular in cross section designed box is assigned. By bending the tongue 24, the resilient Web 21 and thus the cams 5 "or 6" arranged on them bent laterally, so that the shutter can be opened without difficulty.

In the embodiment of FIGS. 5 to 9, this is the reinforcing edge 3 of the container 4 overlapping edge 1 of the lid 2 within the perpendicular projection each clamping cam 5, 6, 7 recessed in such a way that a window 12, 13, 14 is formed is.

The right-angled triangular extension 15 of the reinforcement edge protrudes into this window 3 into it, which engages under in the area of this window by the clamping cams 5 or 6, 7 will. A clamping cam in FIG. 7, the clamping cam 5, is with a handle serving tongue 8 equipped. The other two clamping cams 6, 7 are on the The outside is provided with a corresponding reinforcing strip 6 a or 7 a. By Pushing up the handle 8 is on this associated clamping cam 5 and the Approach 15 exerted a compressive force, which is the bending moment from the length of the tongue 8 corresponds. The load size of the cam 5 is designed so that when a predetermined bending moment of the cam is broken off with the tongue and thereby the internal tension of the clamped in at three points by means of the cams 5, 6, 7 Cover is resolved. The lid can then be easily removed from the container rim 3.

In the embodiment shown in FIGS. 10 to 14 is below Retention of the features of the invention of the lid edge 1 executed continuously and in the area of the clamping cams 5 ', 6', 7 ', the wall thickness of the ceiling edge 1' is preferred increased to the thickness of the reinforcement edge 16 '. At the same time this is reinforcement out to the Ranldoberseite of the lid to there a seating surface 17 for the Attack the stamp to form the locking machine. This creates a reinforcement the upper edge of the lid 2 created, which causes damage to the the material saving prevents very thin cover when attacking the stamp.

On both sides of the handle, which is also provided as a snap-off tongue 8 'are notch cuts 18, 19 which welcbe when the handle is moved upwards 8 'ensure that the clamping cam 5' is torn open. The notch cuts 18, 19 to both The sides of the handle 8 'can do more in accordance with the precalculated opening force or be formed less deep. After breaking open the notch cuts is here as well the ring tension of the lid lifted so that it can cushion and thereby the Cams 6 ', 7' are released.

Claims (12)

Claims: 1. Plastic containers produced by injection molding or pressing with a cover that can be placed on, which has almost the same cross-sectional profile as the edge of the vessel with surface contact sealing against the inner and outer edge surface of the reinforced vessel edge applies and provided with at least one cam which engages under the reinforced, outwardly protruding container edge in a latching manner, d a d u r c h g e -k e n n n z e i c h n, e t that the container edge facing The surface of the peripherally extending cam (5, 6, 7) has the same profile as the boundary surface (3c) of the container edge tapering towards the thinner cross section of the container wall (4) has and rests behind it with surface contact on this and that the cross-section of the lid edge above the cam is less than in the area of the container edge engaging cam. 2. Container according to claim 1, characterized in that one Cams (5, 6, 7) an outwardly directed, known handle (24) attached is. 3. Container according to claim 1 or 2, characterized in that the Cams (5 ", 6", 7 ") are arranged on a resilient web (21) of the lid edge (1) is caused by the weakening of the edge cross-section in the area (22) above the cam and weakening of an edge reinforcement (16) is formed in the region of the cam. 4. Container according to one of claims 1 to 3, characterized in that that the material cross-section of the overlapping lid edge (1) to the approach (23) of the cam (5 ") evenly, preferably returned to zero cross-section is. 5. Container according to one of the preceding claims, characterized in that that the Outer surface (3a) of the vessel rim (3) with the outer surface (la) the overlapping lid edge (1) forms an acute angle, the apex of which (23) is in the immediate vicinity of the approach of the cam. 6. Container according to one of the preceding claims, characterized in that that three cams are arranged evenly distributed on the circumference of the lid edge. 7. Container according to one of the preceding claims, characterized in that that the cover (2) is in a known manner against the upper inner surface of the container (4) has a sealing edge (9) which is drawn into the interior of the container is and by a rounding (10) and a subsequent web (11) against the upper Part of the inner wall of the container is pressed. 8. Container according to one of the preceding claims, characterized in that that the overlapping edge (1) within the perpendicular projection of each clamping cam (5, 6, 7) is each provided with a window (12, 13, 14). 9. Container according to one of the preceding claims, characterized in that that the container edge (3) is provided with a projection (15), the cross section of which is an approximately right triangle with its longest side on a straight line which is the upper outer corner point (s) of the container with the inner outer Corner point (S ') of the clamping cam (6) connects. 10. Container according to claim 8 and one or more of the remaining Claims, characterized in that the reinforcing rib (16) of the edge (1) in the area of the window (12, 13, 14) with the respective clamping nccken (5, 6, 7) and an additional reinforcement (6a, 7a) and in the area of a clamping cam (5) a handle (8) is provided. 11. Container according to one or more of the preceding claims, characterized in that the wall thickness in the area of the clamping cams (5 ', 6', 7 ') preferably enlarged to the thickness of the reinforcement edge (16 ') and on the upper side of the edge Reinforced to support surfaces (17) for attacking the ram of a closing machine is and that notch cuts (18, 19) are provided on both sides of the handle (8 ') are. 12. Container according to claim 7 and one or more of the remaining Claims, characterized in that to reinforce the pressing of the sealing edge (9) on the inner surface (3 b) of the vessel edge (3) a sealing edge (9) and the web (11) connecting transverse web (20) is provided. ~~~~~~~~ Publications considered: German utility models No. 1 737 774, 1 757 080, 1 793 642; German patent specification No. 829 248; U.S. Patent No. 2,614,727.