EP4257506A1 - Closure device with sealing function for gastroshells - Google Patents

Abstract

The invention provides a closure device that can be reversibly connected to a shell covered by a lid and can be secured with a seal. The closure device includes a first closure element and a second closure element, each of which extends along a longitudinal axis from a first end to an opposite second end and has a hook at a respective first end adapted to close an edge of the lid and the tray overlap, the closure elements having locking devices at their second ends, to which they can be reversibly locked together when their longitudinal axes are aligned along a common longitudinal axis, and have a seal which can be connected and set up in the locked state of the locking elements with the second ends of both closure elements is to indicate the subsequent release of the locked state

Description

The present invention relates to a closure device with a sealing function, which is adapted to close catering trays whose opening is covered by a lid. The closure device has the advantage that it can be attached to catering bowls with lids with little effort, has a seal that indicates when the lid is lifted from the bowl, and can be reused with a new seal.

Due to its shape, the closure device cannot be removed without opening the seal after it has been attached to a catering tray covered by a lid. A further advantage is that in a closure device whose seal has a passive RFID transponder, the RFID transponder can be addressed and read if several such catering trays are stacked close to one another, for example held close to one another in rails in a frame. The catering bowls are made of stainless steel and the lids covering their openings are made of stainless steel, optionally with a circumferential seal made of plastic, for example silicone.

Accordingly, the invention also relates to the use of a closure device on at least two, at least three, preferably at least four bowls made of stainless steel covered with lids, which are arranged in a stack one above the other, for example with a vertical distance of 5 to 30 mm, preferably a vertical distance of up to 20 mm or up to 10 mm, as well as for reading seals that have a passive RFID transponder.

In general, passive RFID transponders are preferred as seals.

Optionally, each bowl provided with a lid is arranged separately in a plastic box, optionally closed with a plastic lid, from which a stack is formed, which stands on a Euro pallet, for example. The plastic boxes in a stack, each containing a tray with a lid, are preferably Euro boxes according to VDA, e.g. size E1, E2 or E3.

The invention has the object of providing a closure device for catering bowls covered with a lid, which can be provided with a seal and cannot be removed non-destructively without breaking the seal. The closure device should be reusable with a new seal and can be attached to a catering tray in a simple manner. Preferably, the closure device should be suitable for being able to read out a passive transponder used as a seal when it is attached to a stainless steel catering tray with a stainless steel lid, which is hidden in a narrow stack of catering trays.

The invention solves the problem with the features of the claims and provides a closure device that can be reversibly connected to a shell covered by a lid and can be secured with a seal.

The closure device has a first closure element and a second closure element, each of which extends along a longitudinal axis from a first end to an opposite second end and has a hook at the respective first end which is adapted to an edge of the lid and an edge of the To reach over the shell, the closure elements having latching devices at their second ends, on which they align their longitudinal axes along a common one Longitudinal axis can be reversibly locked together, and have a seal which, in the locked state of the closure elements, can be connected to the second ends of both closure elements and is set up to indicate the subsequent release of the locked state, or the closure device consists of it. Each closure element has at its first end a handle section with a contact side, which in the locked state extends into a common plane, the contact sides of the handle sections preferably resting on the lid after being attached to a catering tray, and an upper side opposite the contact side, on which the seal can be attached, or on which the seal is attached in the locked state after being attached to a catering tray.

The seal extends over two handle sections that are latched together, so that releasing the latching when removing the closure device from a catering bowl with a lid leads to the seal breaking.

The seal can be attached directly to the adjacent top sides of the handle sections of two latched closure elements, for example by gluing or by arranging a section of the seal through holes in the closure elements, corresponding to a wired seal. Optionally, the area in which the closure elements are locked together and a part of the seal that lies in this area is covered by a clamp element. The clamping element, which covers the locked ends of two closure elements, secures the locked ends against unintentional loosening of their locking. Optionally, the seal can be attached to one or both of the handle sections that are locked together and to a clamp element that covers the ends of the handle sections that are locked to each other. Optionally, the handle sections have recesses adjacent to the second ends, which can be locked together, into which a clamp element engages. The recesses preferably have dimensions that accommodate a clamp element until its free surfaces are flush with the top of the handle sections.

In one embodiment, for example with handle sections made of metal, the seal can preferably only be read optically and, for example, only has a printed code.

Optionally, the seal has an RFID transponder that is connected to a first conductor track, the severance of which triggers a signal in the transponder that when queried of the transponder can be read. The seal is attached, for example glued, to the adjacent top sides of the handle sections of two latched closure elements, and covered by a clamp element which has an extension piece on the surface facing the handle sections and the seal attached thereon, which serves as a means for cutting through when arranging the clamp element the first conductor track is cut through the handles. The signal triggered by the cutting of the first conductor track in the transponder can be read out as information that the transponder was attached to the handles as part of the seal and covered with the clamp element.

The transponder is preferably connected to a second conductor track which runs over both handle sections and/or along one of the handle sections and the clamp element, and the transponder is set up so that cutting the second conductor track triggers a second signal which can be read out when the transponder is interrogated . The second signal can be read as information that the seal has been broken and indicates that the locking of the handle sections has been opened. The second conductor track can, for example, run at a distance from the first conductor track and at a distance from the area towards which the extension piece of the clamp element is directed in order to act on the first conductor track of the seal.

The seal preferably has a transponder which is connected to a first conductor track and a second conductor track, the transponder being set up to emit a first readable signal when querying when the first conductor track is severed and to emit a second readable signal when the second conductor track is severed to submit queries. The second conductor track can be a region of a receiving antenna connected to the transponder or a conductor track that connects a receiving antenna to the transponder, so that the second signal is a reduced range or reduced signal strength or the absence of a response signal when querying the transponder.

Attaching the seal to the top of the handle sections has the advantage that a visual identification of the seal is easily recognizable. The seal preferably has an optical identification, in particular in combination with a passive RFID transponder, which preferably has a readable identification. The labeling can contain information about the contents of the catering tray, information about the origin of the contents and/or the catering tray. The labeling can contain the information directly or be linked to the information, for example in a database are stored and are assigned to the identification when the seal is read, in particular a transponder contained in the seal.

The seal can be connectable to at least one or both of the second ends of the closure elements and a clip element or to the second ends of both closure elements in that it can be glued to the second ends, and optionally can also be glued to a clip element that covers the second ends . Alternatively, the clamp element can be irreversibly connectable to the latched ends of the closure elements, and the seal can only be connected to the clamp element.

The locking devices are preferably set up so that they can be reversibly locked only by moving the first ends perpendicular to their longitudinal axis or only along their longitudinal axis. As a result, the closure elements are set up so that their locking cannot be released by moving the closure elements along their longitudinal axis without breaking the seal.

The closure elements have the hook at the first end of the handle section opposite their second end, which is designed to grip around the edge of a catering bowl and the edge of a lid resting on the catering bowl.

Optionally, one or both of the closure elements can have a hook and a handle section, which are composed of metal or consist in one piece or in one piece of metal, in particular steel, preferably spring steel. For a seal that has a transponder, a handle section made of plastic is preferred. Optionally, at least one or both of the closure elements, each of which has or consists of a hook and a handle section, is made of plastic, assembled or in one piece, preferably in one piece. A closure element whose hook is made of plastic or metal can be latched, for example, by hooking the end bow of the hook under the edge of a catering tray and then pivoting around the end bow until the handle section is arranged in a common plane with the handle section of a further closure element, optionally up to to rest the handle section on the lid that covers the catering tray, can be arranged on the catering tray.

Each closure element preferably consists of a handle section, for example made of metal, preferably made of plastic, and a hook formed in one piece with it or connected to it, which extend along a common longitudinal axis. In the case of a closure element whose handle section is made of plastic, one end of a pull section of the hook is further preferably fixed in a form-fitting manner in the handle section, for example by enclosing, in particular by encapsulating, one end of the pull section of the hook with plastic, which forms a one-piece handle section. Each closure element preferably consists of a handle section made of plastic at its second end, in which the locking device is arranged, and a hook attached to the opposite first end of the handle section, which forms the first end of the closure element, the handle section preferably being irreversibly connected to the hook , or the handle section cannot be separated from the hook without being destroyed.

Gastro trays, which are closed by a closure device when the lid is in place, preferably have an edge which lies in one plane and forms a support surface for a lid, with handle recesses formed along the edge, at least on two opposite edge sections, opposite the support surface. Such handle recesses are open at the bottom when the bottom of the catering bowl is aligned horizontally and below the edge, and serve as a grip for, for example, the fingertips of a hand.

Gastro bowls and/or their lids in accordance with EN 631, in particular DIN 66075, are generally preferred. Therefore, for the purposes of the invention, a gastro bowl can also be referred to as a gastronorm bowl.

The hook of each closure element is adapted to engage with a handle recess of the tray which is open to the plane of the lid, so that each hook is adapted to engage over an edge of the lid and the tray and to engage in the handle recess.

The hooks of the closure elements have on a pull section, which is connected to the handle section along a common longitudinal axis, a distance section adjacent to the handle section with a first bend, and a support section adjacent to it with a second bend, which is offset by the distance section runs parallel to the plane of the tension section, an outer section adjacent to the support section with a third bend, a counter section covered by the support section with a fourth bend, and an engagement section directed towards the support section with a fifth bend, which ends in a final arch.

The pull section extends with the handle section along a common longitudinal axis. The distance section brings the support section at a distance from the plane of the tension section, with the support section preferably running parallel to the plane of the distance section. Through the first and second bends, through which it is connected to the tension section at one end and to the support section at the other end, the spacer section forms a resilient section which is engaged when the engagement section engages in the handle recess and/or when the outer section rests a peripheral edge of the catering bowl and its lid allows a short, resilient movement of the handle sections when they lock together.

The first bend preferably has an angle of, for example, 85° to 95°, in particular 90°, and the second bend has an angle of, for example, 85° to 95°, in particular 90°. Generally preferably, the third bend has an angle of, for example, 75° to 85°, in particular 90° or less than 90°, and the fourth bend has an angle of, for example, 75° to 85°, in particular 90° or less than 90°. The fifth bend preferably has an angle of, for example, 75° to 85°, in particular 90° or less than 90°. In general, the support section, the third bend, the outer section, the fourth bend, the counter section, the fifth bend and the engagement section with the end arch form a hook that is closed circumferentially up to the distance of the end arch from the support section and which extends opposite the distance section from the support section. The distance of the end sheet from the support section forms an opening in the hook relative to the distance section to the support section, which is open to the handle section.

In addition, each closure element is set up by the spacer section so that it is suitable for use on catering trays whose lids are made of stainless steel sheet, as well as for use on catering trays whose lids are made of stainless steel sheet and have a circumferential plastic seal, for example made of silicone. This can be around the lid circumferential plastic seal protrude above the plane of the lid in which the central part of the lid extends.

Each hook preferably consists of a one-piece sheet metal, in particular made of spring steel, which is only bent in the bends and the end bend and runs straight in the sections adjacent to and between the bends.

In one embodiment, each of the closure elements is made in one piece, preferably in one piece, made of metal, in particular spring steel, with a first and a second closure element having or consisting of a hook at their first end and a locking device at their second end, which can be locked together. The latching device of a first closure element can be an elongated hole and the latching device of a second closure element can be a wider end section formed on an undercut area, which can be pushed into the elongated hole and engage therein in a displaceable manner. A seal can be stuck over the second ends that are locked together and determines the locking position of the locking devices that are locked together. In each of the closure elements, the handle section including the locking device can lie in a plane with the pull section.

In a preferred embodiment, the counter section lies in the plane in which the contact side of the handle section extends, with the upper side of the handle section opposite the contact side preferably extending at a smaller distance from the pull section than from the counter section. Because the counter section lies in a common plane with the contact side of the handle section, the closure element is suitable for resting with its contact surface on the lid when closing a catering tray covered with a lid, so that at least one of the closure elements rests when the closure elements lock together rests on the lid and is supported by it and the contact sides of two locking elements that are locked together also rest on the lid, while the hook of each closure element engages with a handle recess in the catering tray. The resting of the contact sides of the handle sections makes it easier to attach the closure device to a catering tray covered with a lid. Generally preferably, the counter section lies with a deviation of a maximum of ± 3 mm, more preferably a maximum of ± 2 mm or a maximum of ± 1 mm in the plane in which the contact side of the handle section extends.

Due to the arrangement of the counter section of the hook, which lies with a deviation of a maximum of ± 3 mm, more preferably a maximum of ± 2 mm or a maximum of ± 1 mm in the plane in which the contact side of the handle section extends, the closure device has a shape made up of two closure elements on, which prevents the closure device from being able to be moved along the lid over its edge or over an edge of the catering tray that is bent away from the lid, without visibly changing or damaging a closure element.

The handle section, which has a contact side that extends in a common plane with the countersection of the hook, has the advantage that the closure device cannot be separated from the lid by sliding along it without deforming the closure device. This is because the edge of the lid prevents the closure device from moving over this edge.

• Fig. 1 eine Seitenansicht einer Verschlussvorrichtung,
• Fig. 2 eine um 90° gedrehte Ansicht der Verschlussvorrichtung von Fig. 1,
• Fig. 3 abschnittsweise eine Verschlussvorrichtung in Eingriff mit einer Gastroschale mit Deckel mit umlaufender Kunststoffdichtung,
• Fig. 4 abschnittsweise eine Verschlussvorrichtung in Eingriff mit einer Gastroschale mit Deckel aus Edelstahl ohne Kunststoffdichtung,
• Fig. 5 den Haken im Detail,
• Fig. 6 ein Klammerelement im Detail,
• Fig. 7 Verschlußelemente,
• Fig. 8 eine Explosionsansicht verrasteter Verschlußelemente mit Siegel mit Transponder,
• Fig. 9 eine Aufsicht zweier jeweils einteiliger Verschlußelemente und
• Fig. 10 die Verschlußelemente von Fig. 9 in Aufsicht an einer Gastroschale bevorzugter Ausführungen zeigen.

The invention will now be described in more detail with reference to the figures in

• Fig. 1 a side view of a closure device,
• Fig. 2 a view of the closure device rotated by 90° Fig. 1 ,
• Fig. 3 in sections a closure device engages with a catering tray with a lid with a circumferential plastic seal,
• Fig. 4 in sections a closure device engages with a catering bowl with a lid made of stainless steel without a plastic seal,
• Fig. 5 the catch in detail,
• Fig. 6 a bracket element in detail,
• Fig. 7 closure elements,
• Fig. 8 an exploded view of locked closure elements with seal with transponder,
• Fig. 9 a top view of two one-piece closure elements and
• Fig. 10 the closure elements of Fig. 9 show a top view of a catering bowl of preferred versions.

In the figures, the same reference numbers designate functionally identical elements. In general, the closure elements have the same structure and preferably only differ in the length of the handle section and/or in the length of the pull section.

The Fig. 1 shows a closure device 1 consisting of a first closure element 2 and a second closure element 3, which each have a terminal hook 10 at their first ends 4 and are locked together at their second ends 5 opposite the first end. The second ends 5 of the closure elements 2, 3, which are locked together, are covered by an optional clamp element 40. The second ends 5 of the closure elements 2, 3 have recesses 6 into which, for example, side walls 41 of the clamp element 40 engage.

Each of the closure elements 2, 3 consists of a handle section 7, which has the second end of each closure element 2, 3, and a hook 10 fixed therein. Each handle section 7 has a top side 7o and an opposite contact side 7u, the contact side 7u and a Countersection 14 of the hook 10 lies in a common plane.

The Fig. 2 shows that side walls 41 of the clamping element 40 engage in recesses 6 at the second ends 5 of the closure elements 2, 3, so that, for example, the side walls 41 of the clamping element 40 can lie flush in a plane with the side surfaces 7s of the handle sections.

The Fig. 3 shows a vertical section through a gastro bowl 30 and a lid 31 resting on it with a circumferential silicone seal 32, which rests on the edge of the gastro bowl 30.

A closure element 2, 3, shown in sections, rests with the contact side 7u on the lid 31, while the hook 10 runs along the seal 32 of the lid 31.

The Fig. 4 shows a vertical section through a gastro bowl 30 and a lid 31 resting on it, which consists of a stainless steel sheet and rests with its edge on the edge of the gastro bowl 30. The hook 10 rests here with its contact section 13 on the edge of the lid 31, the handle section 7 rests with its contact side 7u on the lid 31.

The Fig. 5 shows in detail hook 10, which is also in Fig 3 and Fig. 4 is shown. The pull section 11 spans the distance between the handle section 7 and the Spacer section 12, which extends after the first bend 17 in the direction of the plane in which the contact side 7u of the handle section 7 lies. In the second bend 18, the spacer section 12 is connected to the support section 13, which extends away from the pull section 11 in a plane approximately parallel to the plane of the pull section 11. The support section 13 can rest on the edge of a lid 31. The outer section 14 is arranged by the third bend 19 (N°) from the support section 13 in a direction opposite the distance section 12 and includes the outer edges of the lid 31 and the catering tray 30. The fourth bend 20 (Q°), which adjoins the outer section 14 , arranges the counter section 15 attached to it opposite the contact section 13, so that these, together with the outer section 14, encompass the superimposed edges of the lid 31 and the catering tray 30. The engagement section 16, which is arranged through the fifth bend 21 (P°) in the direction of the support section 13, preferably parallel to the outer section 14, can engage in a handle recess 33 which is formed on the catering tray 30. As is generally preferred, the third bend 19, the fourth bend 20 and the fifth bend 21 are designed in such a way that the opening, which is formed by the distance of the end arch 22, which forms the end of the engagement section 16, from the support section 13, forms a spring can be pushed against the spring tension over the adjacent edges of the lid 31 and catering tray 30.

The Fig. 6 shows a clamp element 40 with side walls 41 which form a U-shape with a common wall 42. On the inside of the side walls 41 there are latching lugs 43 attached, which can engage in suitable recesses 7b of the handle sections 7. According to the preferred embodiment, the clamp element 40 has an extension piece 44 on the surface of the wall 42 facing the latching devices.

The Fig. 7 shows latching devices 50, 51 arranged at second ends 5 of handle sections 7, which can engage one another by moving perpendicular to their longitudinal axis 52 and are arranged along the common longitudinal axis 52 and form a tensile connection. In one, optionally in both, of the handle sections 7, a counter recess 7a is formed, into which an extension piece 44 of a clamp element 40 can be arranged as a means for cutting through a second conductor track 62, which is connected to a transponder.

The Fig. 8 shows a preferred embodiment of two handle sections 7 latched on their latching devices 50, 51, which are covered by a seal 63 which has an RFID transponder 60 which is connected to a first conductor track 61 and a second conductor track 62. In the embodiment shown here, the first conductor track 61 is connected at both ends to the transponder 60 and runs in sections along the outer edges of the seal 63 and crosses an area between the outer edges of the seal and, as shown, can cross a central area of the seal. Two areas of a flat dipole antenna 64 are connected to the transponder 60, opposite one another.

The second conductor track 62, which is connected to the transponder at both ends, runs back and forth in a U-shape along the outer edges of the seal 63. The seal 63 is covered by a clamp element 40 in the area in which it covers the latching devices 50, 51 and is preferably glued to them. The clamp element 40 has an extension piece 44 that cuts through the first conductor track 61. When arranging the clamp element 40, which includes the locking devices 50, 51 with its wall 42 and its side walls 41, a first signal is triggered in the transponder by cutting the first conductor track 61, which can be read out when the transponder is interrogated. Since the cutting of the first conductor track 61 is irreversible, the generation of the first signal is also irreversible, so that after the locking devices 50, 51 have been locked on a catering tray with a lid, the transponder 60 is irreversibly changed by the clamp element 40 to generate a readable first signal .

Each handle section preferably has a counter recess 7a for receiving the extension piece 44 in the area in which the extension piece 44 of a clamp element can be arranged.

The second conductor track 62 runs at a distance from the area in which the first conductor track 61 can be severed by the extension piece 44, so that the second conductor track 62 is intact when the seal 63 with the transponder 60 on it has the latching devices 50, 51 of the latched ones Closure elements 2, 3 are covered and the clamp element 40 at least partially covers the seal 63, the extension piece 44 having severed the first conductor track 61.

Since the second conductor track 62 of the seal 63 is attached, in particular glued, to both closure elements 2, 3, the second conductor track 62 is interrupted when the locking mechanism of the closure elements 2, 3 is opened and triggers a second readable signal in the transponder 60.

The Fig. 9 shows a closure device 1 with a first and a second closure element 2, 3, each of which is in one piece, preferably each consisting of a piece of spring steel. The first ends 4 each have a hook 10, the second ends 5 each have a locking device 50, 51, which can be locked together, here in the form of an elongated hole in the second closure element 3 and in the form of an engagement section of the first closure element 2. According to the Locking the latching devices 50, 51 and aligning the closure elements 2, 3 along a common longitudinal axis 52, a seal 63 is glued over the latched latching devices 50, 51.

The Fig. 10 shows the closure device 1 of Fig. 9 in the locked state of the closure elements 2, 3, the hooks 10 of which grip opposite edges of the catering tray 30 and the lid 31. A seal 63, for example made of paper and/or plastic film, is glued over the interlocked second ends 5 of the closure elements 2, 3, as indicated by the hollow arrow. The embodiment in which both of the closure elements 2, 3 are made in one piece of metal, in particular in one piece of spring steel, is suitable both for use as a closure device on catering trays 30, which are covered by a lid 31 with a protruding circumferential seal 32, as well as in Lids 31 without protruding seal 32. List of reference symbols : 44 attachment piece 1 locking device 50 rest facility 2 first closure element 51 rest facility 3 second closure element 52 longitudinal axis 4 first ending 60 transponders 5 second ending 61 first conductor track 6 recess 62 second conductor track 7 handle section 63 seals 7a counter recess 64 dipole antenna 7b recess 7o top 7s side surface 7u investment page 10 hooks 11 train section 12 distance section 13 edition section 14 outdoor section 15 Countersection 16 intervention section 17 first bend 18 second bend 19 third bend 20 fourth bend 21 fifth bend 22 final sheets 30 gastro bowl 31 lids 32 seal 33 handle recess 40 clamp element 41 side wall 42 wall 43 locking nose

Claims (16)

Closure device (1), which can be reversibly connected to a gastro tray (30) covered by a lid (31), with a first closure element (2) and a second closure element (3), each of which extends along a longitudinal axis (52). first end (4) extends to an opposite second end (5) and has a hook (10) at the respective first end (4), which is designed to grip over an edge of the lid (31) and an edge of the catering tray (30). , wherein the closure elements (2, 3) have locking devices (50, 51) at their second ends (5), on which they can be reversibly locked together when their longitudinal axes (52) are aligned along a common longitudinal axis (52), with a seal ( 63), which in the locked state can be connected to the second ends (5) of both closure elements (2, 3) and is designed to indicate the subsequent release of the locked state. Closure device (1) according to claim 1, characterized in that the second ends (5) of the closure elements (2, 3) are covered by a clamp element (40) in the locked state. Closure device (1) according to one of the preceding claims, characterized in that the locking devices (50, 51) can be reversibly locked only perpendicular to the longitudinal axis (52) by moving the first ends (4). Closure device (1) according to one of the preceding claims, characterized in that each hook (10) is set up to engage with a handle recess (33) in the catering tray (30), which handle recess (33) is open relative to the plane of the lid (31). is to reach over one edge of the lid (31) and one edge of the catering tray (30) and engage in the handle recess (33). Closure device (1) according to one of the preceding claims, characterized in that each hook (10) consists of bent spring steel. Closure device (1) according to one of the preceding claims, characterized in that each closure element (2, 3) consists in one piece of metal. Closure device (1) according to one of claims 1 to 6, characterized in that each closure element (2, 3) has at its second end (5) a handle section (7) made of plastic, in which the latching device (50, 51) is arranged , and with which the hook (10), which forms the first end (4), is irreversibly connected opposite the locking device (50, 51). Closure device (1) according to one of the preceding claims, characterized in that the seal (63) contains an RFID transponder (60). Closure device (1) according to claim 8, characterized in that the RFID transponder (60) is connected to a first conductor track (61) which runs in an area in which it is separated by a means for cutting through which is connected to the closure device (1 ) is connected, can be severed, wherein the RFID transponder (60) is set up to generate a readable first signal when the first conductor track (61) is severed, and that the RFID transponder (60) is connected to a second conductor track (61). , which runs at a distance from the area in which the first conductor track (61) can be severed by the means for cutting, and the RFID transponder (60) is set up to produce a readable second signal when the second conductor track (62) is interrupted generate. Closure device (1) according to claim 9, characterized in that the means for cutting is an extension piece (44) of a clamp element (40) and one or both of the handle sections (7) has a counter recess (7a) for receiving the extension piece (44). Closure device (1) according to one of the preceding claims, characterized in that the seal (63) can be connected to the second ends (5) of both closure elements (2, 3) in that it is glued to the second ends (5) and optionally is additionally glued with a clamp element (40) which covers the second ends (5). Closure device (1) according to one of the preceding claims, characterized in that the hooks (10) of the closure elements (2, 3) on a pull section (11) have a spacer section (12) adjacent to a first bend (17), followed by a second Bend (18) adjacent to a support section (13), which runs offset around the distance section (12) parallel to the plane of the tension section (11), an outer section (14) adjacent to the support section (13) with a third bend (19), and one of the support section with a fourth bend (20) adjacent thereto (13) covered counter section (15), and adjacent to it with a fifth bend (21) have an engagement section (16) directed towards the support section (13), which ends in a final arch (22). Closure device (1) according to one of the preceding claims, characterized in that the counter section (15) lies with an offset of a maximum of ± 3 mm in the plane in which a contact side (7u) of the handle section (7) extends, the Contact side (7u) opposite top (7o) of the handle section (7) extends at a smaller distance from the pull section (11) than from the counter section (15). Closure device (1) according to one of the preceding claims, characterized in that it is attached to a catering tray (30) covered by a lid (31), the hooks (10) comprising opposite handle recesses 33 in the catering tray (30), the locking devices ( 1) the closure elements (2, 3) are locked together, the handle sections (7) rest with their contact side (7u) on the lid (31) and the seal (63) with the locking devices (1) of both closure elements (2, 3) connected is. Use of a closure device (1) according to one of claims 1 to 13 for closing a catering tray (30) covered by a lid (31). Use according to claim 15, characterized in that at least one gastro bowl (30) closed with a closure device (1) and covered by a lid (31) is arranged below a gastro bowl (30) in a stack of gastro bowls (30).

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