Locking system for a collapsible container

Description

Technical Field of the Invention

[0001] The present invention relates to a foldable container according to the preamble of claim 1.

Background Art

[0002] Containers are known in the art which have an essentially rectangular bottom and four collapsible side walls, one on each side of the bottom, which are folded inwards towards the bottom when the container is in a collapsed state. Locking mechanisms for attaching the adjacent side walls to each other when the container is in an erected state are also known. One example of such a locking mechanism is shown in DE 10137328, wherein a lock setting unit is arranged next to a grip hole in the short end side walls and the ends of which are arranged in slits in stiffening elements on the side wall. By pressing the lock setting unit upwards from below, the locking is released and the user of the container can fold the side walls towards the bottom of the container. However, this known locking mechanism has a number of drawbacks. For instance, it is quite likely that a user would release the locking by accident when gripping the container and by mistake gripping the actuating element instead of the grip hole.

[0003] US 2003/000950 A1 discloses a foldable transportation container comprising a container body formed into a box having a rectangular bottom, and a pair of first side walls and a pair of second side walls provided along the periphery of the bottom wall, rotating means provided on the lower ends of the side walls so that the side walls can be folded inward of the container body, an engagement member provided on the outside face of the first side wall. Engagement portions are provided on both ends of each second side wall. The first side walls are folded onto the upper face of the bottom wall and then the second side walls are folded onto the first side walls. An operation portion is provided at the substantial center of each engagement member. Engagement projections are provided at the ends of each engagement member. The engagement portions are engaged with the engagement projections to limit inward rotation of the first side walls. The operation portions of the engagement members are moved up or down to release engagement between the engagement projections and the engagement portions.

Summary of the Invention

[0004] It is an object of the present invention to alleviate the above mentioned drawbacks and provide a locking device for a container with foldable side walls which provides a reliable locking function, which is easy to release and which ensures that the locking is not released by accident.

[0005] This object is achieved by a locking device having the characterising features of independent claim 1, with preferred embodiments indicated in the dependent claims 2-8.

[0006] In the locking device according to the invention, the foldable container has

• an essentially rectangular bottom wall;
• four side walls movably attached to the bottom wall for movement between a folded position adjacent the bottom wall and an erected position;
• locking devices in two opposite first sidewalls for releasably locking these sidewalls to adjacent opposite second sidewalls;
• each of said locking devices comprising
  • a locking lever movably mounted in its associated first sidewall for movement between a rest position and an unlocking position and having at least one locking element projecting from its free end,
  • a locking surface on an adjacent second sidewall for engagement with an engagement surface on the locking element when said first and second sidewalls are in their erected position and when the locking lever is in its rest position, and
  • a spring element for biasing the locking lever towards its rest position,
    wherein the locking lever is swingably attached to its associated first side wall for swinging around an axis essentially perpendicular to said first side wall and movement between the rest and unlocked positions.

[0007] When a user presses on the lever in a location eccentrically positioned from the axis, the lever turns on the axis and locking elements on the lever are released from engagement with the locking surfaces on the adjacent side walls. This gives a simple and secure locking device, which is advantageous since it can very easily be released by a user so that the side walls can be folded towards the bottom and also since it during normal use is very unlikely to be released by mistake by the user.

[0008] The locking lever is a double-armed locking lever being rotatably connected between its ends on a pivot pin defining said axis and having locking elements on each end. The use of the pivot pin is a simple and efficient manner of providing a swingable lever, and the double-armed lever has the advantage of being able to release the locking elements on both ends of the locking lever when a user presses down on one portion of the lever at a distance from the pivot pin.

[0009] The locking lever is connected to the pivot pin substantially halfway from its ends. This gives the advantage of an efficient lifting and lowering, respectively, of the two ends of the lever so that the locking elements are released.

[0010] Preferably, one of the ends of the double-armed locking lever is situated closer to said bottom wall than its other end when the locking lever is in its unlocking position. This gives the advantage of making it possible to release both ends of the lever at the same time.

[0011] The locking surface or each locking surface is formed on one side of a lock lug projecting from its associated second side wall. This is a simple and efficient manner of providing the locking surface.

[0012] The side surface of the lock lug opposite to the locking surface can form a chamfered guiding surface for moving the locking element from its rest position to its unlocking position when moving said first side wall from its folded to its erected position for guiding the locking element past the locking lug and into engagement with the locking surface. This has the advantage that the user does not have to actively manipulate the locking device when moving the side walls from their folded position to their erected position and into a locking engagement with the adjacent side wall, but instead only press the side walls up towards their erected position. The locking element/s simply slide on the projection/s and end up in their locking position when the user has erected the side walls.

[0013] Further, the locking element can be tapered in the direction away from the engagement surface for presenting a narrow engagement line engaging said guiding surface. This gives the advantage of further facilitating the moving of the locking elements on the guiding surfaces when erecting the side walls and making it easier for the user to erect the side walls and lock them in the erected position.

[0014] The second sidewalls preferably have stop surfaces for engagement with the first sidewalls in the erected position of the sidewalls when the locking elements engage with the locking surfaces. This ensures that the first side walls are securely positioned in their erected position and that they cannot be folded outwards from the bottom.

[0015] These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.

Brief Description of the Drawings

[0016] 

Fig 1 is a perspective side view of a lever according to the invention.

Fig 2 is a perspective view from the inside of a container towards a corner of the container, where the locking elements and the projections are in a non-locking position.

Fig 3 is a perspective view showing part of the outside and part of the inside of the container with the locking elements and projections in locking engagement.

Fig 4 is a side view of part of the side wall with the locking elements and the projections in a locking position.

Fig 5 is a perspective view of the foldable container according to the invention.

Fig 6 is a perspective, sectional view of the lever mounted on the side wall.

Detailed Description of Preferred Embodiments of the Invention

[0017] In Fig. 5 a foldable container 4 is shown. The container has four side walls 5, 6 and a bottom wall 11. Two first side walls 5 are arranged opposite each other, and between the first side walls 5, two opposite second side walls 6 are arranged. The side walls 5 and 6 are hingedly attached to the bottom 11 of the container so that they can be folded down towards the bottom 11.

[0018] The container 4 is provided with a locking device which consists of a locking lever 1 mounted on each of the first side walls 5 and lock lugs 7 arranged on each of the adjacent second side walls 6.

[0019] The lever 1 is a double-armed lever and is rotatably mounted on a pivot pin 12 which defines an axis A, which is perpendicular to the first side wall 5, as shown in Fig. 6.

[0020] In Fig. 1 the lever 1 is shown in more detail and separate from the rest of the container 4. The lever has spring elements 3 and locking elements 2 which have engagement surfaces 2a.

[0021] On the second side wall 6 lock lugs 7 are provided. The lock lugs 7 each have a bevelled or chamfered guiding surface 7a and a locking surface 7b.

[0022] At the corners of the container 4 stop surfaces 10 are provided on the second side walls 6, which extend around the corners of the container 4 to provide a stop for the first side walls 5 when in erected position.

[0023] The lever 1 has a flattened portion 8 and the side wall 5 is provided with a cut out 9 on the edge remote from the connection with the bottom, which makes it easy for the user to reach the flattened portion 8 with for instance his or her thumb. The lever 1 can have two flattened portions 8, one on each side of the crossing point of the axis A with the lever 1.

[0024] To release the locking elements 2 from the locked position as shown in Fig. 3 or 4, the user presses down the lever 1 at a location at a distance from the pivot pin 12, through which the axis A extends. Preferably the user presses down the lever at the flattened portion 8. Then the end of the lever closest to the pressed down flattened portion 8 and the locking elements 2 thereon are moved downwards. Then the locking elements 2 no longer are locked behind the lock lugs 7, since the engagement surfaces 2a slide down below the locking surfaces 7b and are no longer engaged with these.

[0025] At the other end of the lever 1, due to the fact that the lever 1 is swingably attached to the side wall 5 on a pivot pin 12, that other end at the same time moves upwards with the locking elements 2 thereon as the lever 1 swings on the pivot pin 12 around the axis A. Thus, the engagement surfaces 2a slide on the locking surfaces 7a upwards to a location above the lock lugs 7 and the engagement surfaces 2a are no longer engaged with the locking surfaces 7b.

[0026] Thus, both ends of the side wall 5 are free and the side wall is free to move inwards and be folded towards the bottom 11 of the container 4. The user then folds the side walls 5 towards the bottom 11 of the container, and thereafter folds the side walls 6 towards the bottom of the container 4 on top of the side walls 5.

[0027] When the user wishes to erect the side walls 5 and 6 of the foldable container 4, he or she folds up the side walls 6 and the side walls 5 in the same manner as with known foldable containers and erect them, and due to the guiding surfaces 7a on the lock lugs 7, the locking elements 2 slide into locking position behind the lock lugs 7 as in Fig. 2 so that the locking surfaces 7b lie against the engagement surfaces 2a.

[0028] The locking element 2 is tapered in the direction away from the engagement surface 2a which further facilitates the moving of the locking elements 2 since this provides a narrow engagement line engaging the guiding surface 7a.

[0029] In Fig. 3 the container 4 is shown with the locking elements 2 in a locking position behind the lock lugs 7.

[0030] The spring elements 3 ensure that the locking elements 2 are biased towards their rest position, in which the locking surfaces 7b are engaged with the engagement surfaces 2a when the side walls are erected, so that the user does not have to make any manipulations of the lever 1 to bring the locking elements 2 into locking position.

[0031] The lever and the container are preferably made of a plastic material. Further, the spring elements are preferably made of a slightly flexible plastic material.

[0032] In the figures a lever with two locking elements, in a fork shaped configuration, at each end of the lever, is shown. It is also possible to use only one locking element in each end.

[0033] Hence, a foldable container has an essentially rectangular bottom wall 11 to which four side walls 5, 6 are moveably attached for movement between a folded position adjacent the bottom wall and an erected position. Locking devices are used for locking adjacent side walls to each other. The locking devices comprise a movably mounted locking lever 1 on one side wall with a locking element 2 for cooperation with a locking surface 7b on the adjacent sidewall 6. The locking lever 1 is movable between a rest position and an unlocking position and biased towards the rest position by means of a spring element 3. According to the invention the locking lever 1 is swingably attached to its associated side wall 5 for swinging around an axis A essentially perpendicular to this side wall during the movement between the rest and unlocked positions.

Claims

1. A foldable container having

- an essentially rectangular bottom wall (11);

- four side walls (5, 6) movably attached to the bottom wall for movement between a folded position adjacent the bottom wall and an erected position;

- locking devices in two opposite first sidewalls (5) for releasably locking these sidewalls to adjacent opposite second sidewalls (6);

- each of said locking devices comprising

• a locking lever (1) movably mounted in its associated first sidewall for movement between a rest position and an unlocking position and having at least one locking element (2) projecting from its free end,

• a locking surface (7b) on an adjacent second sidewall (6) for engagement with an engagement surface (2a) on the locking element (2) when said first and second sidewalls are in their erected position and when the locking lever is in its rest position, and

• a spring element (3) for biasing the locking lever (1) towards its rest position,

wherein the locking lever (1) is swingably attached to its associated first side wall (5) for swinging around an axis (A) essentially perpendicular to said first side wall and movement between the rest and unlocked positions
characterised in
that said locking lever (1) is a double-armed locking lever being rotatably connected between its ends on a pivot pin (12) defining said axis (A) and having locking elements (2) on each end, and
said locking lever (1) is rotatably connected to the pivot pin (12) substantially halfway from its ends,
wherein the locking elements (2) on both ends of the locking lever (1) are released when one portion of the lever at a distance from the pivot pin (12) is pressed down.

2. Container according to claim 1, wherein one of the ends of the double-armed locking lever (1) is situated closer to said bottom wall (11) than its other end when the locking lever is in its unlocking position.

3. Container according to claim 1 or 2, wherein the locking surface (7b) or each locking surface (7b) is formed on one side of a lock lug (7) projecting from its associated second side wall (6).

4. Container according to claim 3, wherein the side surface of the lock lug (7) opposite to the locking surface (7b) forms a chamfered guiding surface (7a) for moving the locking element (2) from its rest position to its unlocking position when moving said first side wall (5) from its folded to its erected position for guiding the locking element (2) past the lock lug (5) and into engagement with the locking surface (7b).

5. Container according to claim 3 or 4, wherein the locking element (2) is tapered in the direction away from the engagement surface (2a) for presenting a narrow engagement line engaging said guiding surface (7a).

6. Container according to any of the preceding claims, wherein the second sidewalls (6) have stop surfaces (10) for engagement with the first sidewalls (5) in the erected position of the sidewalls (5, 6) when the locking elements (2) engage with the locking surfaces (7b).

Ansprüche

1. Zusammenlegbarer Behälter, der Folgendes umfasst:

- eine im Wesentlichen rechteckige Bodenwand (11);

- vier Seitenwände (5, 6), die beweglich an der Bodenwand angebracht sind, um zwischen einer zusammengelegten Position neben der Bodenwand und einer aufgerichteten Position bewegt werden zu können;

- Verriegelungsvorrichtungen in zwei gegenüberliegenden ersten Seitenwänden (5) zum lösbaren Verriegeln dieser Seitenwände mit benachbarten gegenüberliegenden zweiten Seitenwänden (6);

- wobei jede der Verriegelungsvorrichtungen Folgendes umfasst:

• einen Verriegelungshebel (1), der beweglich in seiner zugehörigen ersten Seitenwand montiert ist, um zwischen einer Ruheposition und einer Entriegelungsposition bewegt zu werden, und der mindestens ein Verriegelungselement (2) aufweist, das von seinem freien Ende hervorsteht,

• eine Verriegelungsfläche (7b) an einer benachbarten zweiten Seitenwand (6) zur Eingriffnahme einer Eingriffnahmefläche (2a) an dem Verriegelungselement (2), wenn sich die erste und die zweite Seitenwand in ihrer aufgerichteten Position befinden und wenn der Verriegelungshebel sich in seiner Ruheposition befindet, und

• ein Federelement (3) zum Vorspannen des Verriegelungshebels (1) in Richtung seiner Ruheposition,

wobei der Verriegelungshebel (1) schwenkbar an seiner zugehörigen ersten Seitenwand (5) angebracht ist, um um eine Achse (A) herum geschwenkt zu werden, die im Wesentlichen senkrecht zu der ersten Seitenwand verläuft, und um zwischen der Ruheposition und der unverriegelten Position bewegt zu werden,
dadurch gekennzeichnet,
dass der Verriegelungshebel (1) ein zweiarmiger Verriegelungshebel ist, der zwischen seinen Enden drehbar mit einem Drehzapfen (12) verbunden ist, der die Achse (A) definiert, und an jedem Ende Verriegelungselemente (2) aufweist, und
dass der Verriegelungshebel (1) im Wesentlichen in der Mitte zwischen seinen Enden drehbar mit dem Drehzapfen (12) verbunden ist, wobei die Verriegelungselemente (2) an beiden Enden des Verriegelungshebels (1) entriegelt werden, wenn ein Abschnitt des Hebels in einer Entfernung von dem Drehzapfen (12) niedergedrückt wird.

2. Behälter nach Anspruch 1, wobei eines der Enden des zweiarmigen Verriegelungshebels (1) näher an der Bodenwand (11) angeordnet ist als sein anderes Ende, wenn sich der Verriegelungshebel in seiner Entriegelungsposition befindet.

3. Behälter nach Anspruch 1 oder 2, wobei die Verriegelungsfläche (7b) oder jede Verriegelungsfläche (7b) auf einer Seite einer Verriegelungslasche (7) ausgebildet ist, die von ihrer zugehörigen zweiten Seitenwand (6) hervorsteht.

4. Behälter nach Anspruch 3, wobei die Seitenfläche der Verriegelungslasche (7) gegenüber der Verriegelungsfläche (7b) eine abgeschrägte Führungsfläche (7a) bildet, um das Verriegelungselement (2) aus seiner Ruheposition in seine Entriegelungsposition zu bewegen, wenn die erste Seitenwand (5) aus ihrer zusammengelegten Position in ihre aufgerichtete Position bewegt wird, um das Verriegelungselement (2) an der Verriegelungslasche (5) vorbei und in Eingriffnahme mit der Verriegelungsfläche (7b) zu führen.

5. Behälter nach Anspruch 3 oder 4, wobei das Verriegelungselement (2) in der Richtung verjüngt ist, die von der Eingriffnahmefläche (2a) fort weist, um eine schmale Eingriffnahmelinie zu bilden, welche die Führungsfläche (7a) in Eingriff nimmt.

6. Behälter nach einem der vorangehenden Ansprüche, wobei die zweiten Seitenwände (6) Endanschlagflächen (10) aufweisen, welche die ersten Seitenwände (5) in der aufgerichteten Position der Seitenwände (5, 6) in Eingriff nehmen, wenn die Verriegelungselemente (2) die Verriegelungsflächen (7b) in Eingriff nehmen.

Revendications

1. Récipient repliable comportant:

- une paroi de fond (11) essentiellement rectangulaire ;

- quatre parois latérales (5,6) fixées de manière mobile à la paroi de fond en vue d'un mouvement entre une position pliée adjacente à la paroi de fond et une position dressée ;

- des dispositifs de verrouillage dans deux premières parois latérales opposées (5) afin de verrouiller de manière libérable ces parois latérales à des secondes parois latérales opposées (6) ; chacun desdits dispositifs de verrouillage comprenant

• Un levier de verrouillage (1) monté de manière mobile dans sa première paroi latérale associée en vue d'un mouvement entre une position de repos et une position de déverrouillage et ayant au moins un élément de verrouillage (2) dépassant de son extrémité libre,

• Une surface de verrouillage (7b) sur une second paroi latérale adjacente (6) en vue d'une mise en prise avec une surface de mise en prise (2a) sur l'élément de verrouillage (2) quand lesdites premières et secondes parois latérales sont dans leur position dressée et quand le levier de verrouillage est dans sa position de repos, et

• Un élément de ressort (3) pour polariser le levier de verrouillage (1) dans le sens de sa position de repos,

dans lequel le levier de verrouillage (1) est fixé de manière pivotante à sa première paroi latérale associée (5) afin de pivoter autour d'un axe (A) essentiellement perpendiculaire à ladite première paroi latérale et se déplacer entre les positions de repos et déverrouillée,
caractérisé en ce que
ledit levier de verrouillage (1) est un levier de verrouillage à double bras étant raccordé de manière rotative entre ses extrémités sur une goupille de pivot (12) définissant ledit axe (A) et possédant des éléments de verrouillage (2) à chaque extrémité, et
ledit levier de verrouillage (1) est raccordé de manière rotative à la goupille de pivot (12) substantiellement à mi-chemin de ses extrémités, dans lequel les éléments de verrouillage (2) sur les deux extrémités du levier de verrouillage (1) sont libérées quand une portion du levier à une distance de la goupille de pivot (12) est pressée vers le bas.

2. Récipient selon la revendication 1, dans lequel une des extrémités du levier de verrouillage (1) à double bras est située plus près de ladite paroi de fond (11) que son autre extrémité quand le levier de verrouillage est dans sa position de déverrouillage.

3. Récipient selon la revendication 1 ou 2, dans lequel la surface de verrouillage (7b) ou chaque surface de verrouillage (7b) est formée sur un côté d'un tenon de verrouillage (7) dépassant de sa seconde parois latérale (6) associée.

4. Récipient selon la revendication 3, dans lequel la surface latérale du tenon de verrouillage (7) opposée à la surface de verrouillage (7b) forme une surface de guidage chanfreinée (7a) pour déplacer l'élément de verrouillage (2) de sa position de repos à sa position de déverrouillage quand ladite première paroi latérale (5) est déplacée de sa position pliée à sa position dressée pour guider l'élément de verrouillage (2) au-delà du tenon de verrouillage (5) et en venant en prise avec la surface de verrouillage (7b).

5. Récipient selon la revendication 3 ou 4, dans lequel l'élément de verrouillage (2) est effilée dans la direction qui se détourne de la surface de mise en prise (2a) afin de présenter une ligne de mise en prise étroite venant en prise avec ladite surface de guidage (7a).

6. Récipient selon une quelconque des revendications précédentes, dans lequel les secondes parois latérales (6) ont des surfaces d'arrêt (10) pour la mise en prise avec les premières parois latérales (5) dans la position dressée des parois latérales (5,6) quand les éléments de verrouillage (2) viennent en prise avec les surfaces de verrouillage (7b).

Drawing