Abstract:
The invention relates to a closure element ( 1 ) in the form of a window or a door. The invention also relates to a joint axis mechanism ( 9 ) for such a closure element. The closure element ( 1 ) has a liquid crystal film ( 5 ) which is connected to cables ( 26 ) that are connected to other cables ( 22 ) via sliding contacts of an electrical connecting unit ( 16 ).

Description:
BACKGROUND OF THE INVENTION 
     The invention relates to a closure element in the form of a window or a door, in particular a refrigerator door or a door to a building (for example a store). The invention further relates to an articulation axis mechanism for a closure element of this kind. 
     An LCD screen (liquid-crystal screen), which is used as a computer screen or television screen for example, is known from the prior art. The technology of the LCD screen is based on the principle that liquid crystals influence the direction of polarization of light when a voltage is applied. An LCD screen is divided up into numerous picture elements (pixels), which can be electrically activated. As a result, it is possible to reproduce graphical displays using the LCD screen. In order to display colors, 3 subpixels are used for the primary colors red, green and blue per picture element (pixel). 
     The use of liquid crystals has in the meantime also found its way into glass element technology. For example, a glass element which is provided with a liquid-crystal film is known from the prior art. The liquid-crystal film is, for example, arranged between a first glass pane and a second glass pane. By applying a voltage to the liquid-crystal film and by switching the voltage on or off, poles of liquid crystals are oriented, so that the liquid-crystal film becomes opaque or transparent. As a result, it is possible to make a glass element (for example a glass window or glass door) transparent or opaque. 
     When the glass element is moved from a first position (for example a closed position) to a second position (for example an open position), the glass element is pivoted, for example, about a first axis. This may result in lines which are used for activating and/or supplying power to the liquid-crystal film, being distorted (for example being twisted) and possibly tearing. 
     SUMMARY OF THE INVENTION 
     The invention is based on the object of specifying a closure element (in particular a door or a window) which can be easily opened and closed on the one hand and, on the other hand, allows sufficiently effective activation of a liquid-crystal film which is contained in the closure element. 
     According to the invention, this object is achieved by a closure element comprising the features of claim  1 . An articulation axis mechanism according to the invention is given by the features of claim  14 . A further closure element according to the invention is given by the features of claim  17 . Further features of the invention can be gathered from the following description, the appended claims and/or the appended drawings. 
     The closure element according to the invention has at least one first transparent pane element and at least one second transparent pane element. At least one liquid-crystal film, which can be activated, is arranged between the first transparent pane element and the second transparent pane element. The liquid-crystal film, which can be activated, is laminated onto the first transparent pane element and/or the second transparent pane element for example. However, the invention is not restricted to this manner of fastening. Rather, any manner of fastening with which the liquid-crystal film can be fastened to the first transparent pane element and/or the second transparent pane element is suitable for the invention. The first transparent pane element and/or the second transparent pane element are/is in the form of a glass element/glass elements for example. However, it is explicitly pointed out that the invention is not restricted to the use of glass elements. Rather, any element in which a liquid-crystal film can be used, for example a plastic element, in particular a Plexiglas element, is suitable for the invention. 
     The closure element according to the invention has at least one articulation axis mechanism. The articulation axis mechanism serves to arrange the closure element in an articulated manner on a component, for example a floor of a room or of a device or, for example, a floor panel of a room or of a device. The articulation axis mechanism has at least one articulation axis element and at least one retaining element, wherein the closure element can be rotated about a first axis of the articulation axis mechanism. The closure element can be moved from a first position (for example an open position) to a second position (for example a closed position) by rotation about the first axis for example. The articulation axis element is arranged on the retaining element. The articulation axis element is, for example, screwed to the retaining element. However, any other manner of arrangement which is suitable for arranging the articulation axis element on the retaining element can also be provided. 
     The retaining element is arranged between the first transparent pane element and the second transparent pane element. The retaining element is, for example, adhesively bonded or laminated to the first transparent pane element and/or to the second transparent pane element. In addition to or as an alternative to this, provision is made for the retaining element to be held in a clamping manner between the first transparent pane element and the second transparent pane element. 
     In the closure element according to the invention, provision is further made for the articulation axis element to have at least one opening for at least one first electrical line to pass through. Furthermore, the articulation axis element has at least one receiving unit and at least one electrical connecting element for electrically connecting the first electrical line to a second electrical line, wherein the electrical connecting element is arranged in the receiving unit. The electrical connecting element has at least one first connecting unit and at least one second connecting unit, wherein the second connecting unit is designed such that it can be rotated relative to the first connecting unit about a second axis. The second connecting unit is fixedly arranged on the receiving unit in order to prevent relative movement of the second connecting unit in relation to the receiving unit. 
     In the closure element according to the invention, provision is also made for the first connecting unit to have at least one first contact element which is connected to at least one first sliding contact and on which the first electrical line is arranged. Furthermore, the second connecting unit has at least one second contact element which is connected to at least one second sliding contact and on which the second electrical line is arranged. The first sliding contact is arranged on the second sliding contact, and the second electrical line is connected to the liquid-crystal film. 
     The invention is based on the surprising finding that the described design of the closure element according to the invention (in particular a door or a window) ensures that the closure element can be easily opened and closed on the one hand and, on the other hand, allows sufficiently effective activation of the liquid-crystal film which is received in the closure element. Distortion and tearing-off of lines, as in the case of the prior art, cannot occur. The articulation axis element is incorporated, for example, into the floor of a device or the floor of a room and then forms the articulation axis about which the closure element is designed such that it can be rotated. 
     The closure element is in the form of, for example, a cabinet door, in particular in the form of a refrigerator door. However, the closure element according to the invention is not restricted to this. Rather, the closure element according to the invention can be used anywhere that it is suitable for serving as a closure element, for example for separating off a room. By applying a voltage to the liquid-crystal film and by switching the voltage on or off, poles of liquid crystals are oriented, so that the liquid-crystal film becomes opaque or transparent. As a result, it is possible to make the closure element transparent or opaque. However, it is also possible to display other displays (for example pictures or films) by means of the liquid-crystal film by way of suitable activation. 
     In an exemplary embodiment of the closure element according to the invention, provision is made, in addition or as an alternative, for the retaining element to have at least one first retaining element part and at least one second retaining element part. The second retaining element part is arranged between the first transparent pane element and the second transparent pane element. In contrast, the first retaining element part is arranged on the articulation axis element. The first retaining element part and the second retaining element part are arranged at an angle, which is different from 0° and 180°, in relation to one another. Therefore, the first retaining element part and the second retaining element part are not arranged parallel in relation to one another. It has been found that this embodiment requires a particularly small amount of installation space and can therefore be easily integrated into a closure element. In a further embodiment, provision is made, in addition or as an alternative, for the angle between the first retaining element part and the second retaining element part to be 90°. 
     In a further exemplary embodiment of the closure element according to the invention, provision is made, in addition or as an alternative, for the first axis and the second axis to be identical. Therefore, the axis about which the closure element is designed such that it can be rotated and the axis about which the first connecting unit can be rotated relative to the second connecting unit are identical. In an exemplary embodiment, provision is made for the first axis and the second axis to be oriented vertically. However, the closure element according to the invention is not restricted to this orientation. Rather, in the closure element according to the invention, any suitable orientation of the first axis and/or the second axis can be selected. 
     In a yet further exemplary embodiment of the closure element according to the invention, provision is made, in addition or as an alternative, for the closure element to have at least one third transparent pane element. The third transparent pane element is in the form of, for example, a glass element. However, it is explicitly pointed out that the invention is not restricted to the use of a glass element. Rather, any element, for example a plastic element, in particular a Plexiglas element, is suitable for the third transparent pane element. In the exemplary embodiment, at least one intermediate space for receiving an insulating medium is further arranged between the second transparent pane element and the third transparent pane element. The insulating medium used is, for example, air or another insulating gas. The above-described embodiment is suitable, in particular, for closing a refrigerator or a climate-controlled room. 
     In an exemplary embodiment of the closure element according to the invention, provision is made, in addition or as an alternative, for the second transparent pane element and the third transparent pane element to have at least one cutout in which the articulation axis mechanism is arranged. 
     In a once again further exemplary embodiment of the closure element according to the invention, provision is made, in addition or as an alternative, for the second transparent pane element to have a first edge, and for the third transparent pane element to have a second edge. At least one spacer is arranged between the second transparent pane element and the third transparent pane element, said spacer not adjoining the first edge and not adjoining the second edge. It is possible to form the abovementioned intermediate space by using a plurality of spacers. The region between the spacer and the first edge or the second edge can then be filled, for example, with silicone in such a way that a particularly good esthetic impression is created. The abovementioned embodiment is suitable, for example, particularly for use in a further embodiment of the closure element according to the invention. In this embodiment, provision is made for the second transparent pane element to be designed without a frame, and/or for the third transparent pane element to be designed without a frame. In a further embodiment, provision is made, in addition or as an alternative, for the first transparent pane element to be designed without a frame. In the above text and also in the text which follows, a frameless transparent pane element is intended to be understood to mean a transparent pane element of which the edges are not arranged in a frame. The edges or at least some of the edges of the transparent pane element are therefore freely accessible at least in one position of the closure element (or in all positions of the closure element). 
     In a once again further exemplary embodiment of the closure element according to the invention, provision is made, in addition or as an alternative, for the retaining element to be fixedly adhesively bonded to the first transparent pane element and/or to the second transparent pane element. In a further exemplary embodiment of the closure element according to the invention, provision is made, in addition or as an alternative, for the retaining element to be laminated to the first transparent pane element and/or to the second transparent pane element. 
     The invention also relates to an articulation axis mechanism for a closure element in the form of a window or a door, in particular a refrigerator door. The articulation axis mechanism has, for example, at least one or a combination of at least two of the features already mentioned above. In particular, the articulation axis mechanism has at least one articulation axis element and at least one retaining element for arranging the closure element. The articulation axis element is arranged on the retaining element, and the articulation axis element has at least one opening for at least one first electrical line to pass through. The articulation axis element further has at least one receiving unit. At least one electrical connecting element for electrically connecting the first electrical line to a second electrical line is arranged in the receiving unit. The electrical connecting element has at least one first connecting unit and at least one second connecting unit, wherein the second connecting unit is designed such that it can be rotated relative to the first connecting unit about one axis. The second connecting unit is fixedly arranged on the receiving unit in order to prevent relative movement of the second connecting unit in relation to the receiving unit. The first connecting unit has at least one first contact element which is connected to at least one first sliding contact and on which the first electrical line is arranged. The second connecting unit further has at least one second contact element which is connected to at least one second sliding contact and on which the second electrical line is arranged, and wherein the first sliding contact is arranged on the second sliding contact. 
     In an embodiment of the articulation axis mechanism according to the invention, provision is made, in addition or as an alternative, for the retaining element to have at least one first retaining element part and at least one second retaining element part. The second retaining element part is intended to be arranged on the closure element. The first retaining element part is arranged on the articulation axis element. The first retaining element part and the second retaining element part are arranged at an angle, which is different from 0° and 180°, in relation to one another. The angle is, for example, 90°. 
     The invention also relates to a further closure element in the form of a door or a window. This further closure element can have at least one of the above features or a combination of at least two of the above features. Provision is made, in particular, for said further closure element according to the invention to have at least one first transparent pane element and at least one second transparent pane element. At least one liquid-crystal film, which can be activated, is arranged between the first transparent pane element and the second transparent pane element. The liquid-crystal film, which can be activated, is, for example, laminated onto the first transparent pane element and/or the second transparent pane element. However, the invention is not restricted to this manner of fastening. Rather, any manner of fastening with which the liquid-crystal film can be fastened to the first transparent pane element and/or the second transparent pane element is suitable for the invention. The first transparent pane element and/or the second transparent pane element are/is in the form of, for example, a glass element/glass elements. However, it is explicitly pointed out that the invention is not restricted to the use of glass elements. Rather, any element in which a liquid-crystal film can be used, for example a plastic element, in particular a Plexiglas element, is suitable for the invention. 
     The further closure element according to the invention has at least one articulation axis mechanism. The articulation axis mechanism serves to arrange the closure element in an articulated manner on a component, for example a floor of a room or of a device or, for example, a floor panel of a room or of a device. The closure element can be moved from a first position (for example an open position) to a second position (for example a closed position) by rotation about one axis for example. 
     The articulation axis mechanism of the further closure element has at least one opening for at least one electrical line to pass through. The electrical line is, for example, connected to the liquid-crystal film, which can be activated, for activating the liquid-crystal film, which can be activated. The articulation axis mechanism further has at least one first articulation axis unit and at least one second articulation axis unit. Furthermore, the closure element has at least one third transparent pane element which is arranged at a distance from the second transparent pane element in such a way that an intermediate space is arranged between the second transparent pane element and the third transparent pane element. The first transparent pane element is arranged on the first articulation axis unit and/or on the second articulation axis unit. Provision is further made for the second transparent pane element and the third transparent pane element to be arranged between the first articulation axis unit and the second articulation axis unit. 
     The invention is based on the surprising finding that the described design of the further closure element according to the invention (in particular a door or a window) ensures that the further closure element can be easily opened and closed on the one hand and, on the other hand, allows sufficiently effective activation of the liquid-crystal film which is received in the closure element. Furthermore, effective insulation is provided, so that the further closure element can be used, in particular, as a cabinet door or refrigerator door. However, the further closure element according to the invention is not restricted to this. Rather, the further closure element according to the invention can be used anywhere that it is suitable for serving as a closure element, for example for separating off a room. By applying a voltage to the liquid-crystal film and by switching the voltage on or off, poles of liquid crystals are oriented, so that the liquid-crystal film becomes opaque or transparent. As a result, it is possible to make the further closure element transparent or opaque. However, it is also possible to display other displays (for example pictures or films) by means of the liquid-crystal film by way of suitable activation. 
     In one embodiment of the further closure element according to the invention, provision is made, in addition or as an alternative, for a gas or a gas mixture to be arranged in the intermediate space between the second transparent pane element and the third transparent pane element. The gas or the gas mixture is in the form of, for example, an insulating medium. Air or an inert gas is arranged in the intermediate space for example. 
     In a further embodiment of the further closure element according to the invention, provision is made, in addition or as an alternative, for the liquid-crystal film, which can be activated, to be arranged between a first PVB film and a second PVB film, wherein the abbreviation PVB stands for polyvinyl butyral. The liquid-crystal film, which can be activated, is particularly effectively protected in this way. 
     In a once again further embodiment of the further closure element according to the invention, provision is made, in addition or as an alternative, for at least one first sealing unit to be arranged between the first articulation axis unit on the one hand and the second transparent pane element and/or the third transparent pane element on the other hand. To this end, provision is made, in addition or as an alternative, for at least one second sealing unit to be arranged between the second articulation axis unit on the one hand and the second transparent pane element and/or the third transparent pane element on the other hand. The first sealing unit and the second sealing unit serve, in particular, to seal off the intermediate space between the second transparent pane element and the third transparent pane element. 
     In an embodiment of the further closure element according to the invention, provision is made, in addition or as an alternative, for the electrical line to be in the form of a first electrical line. The articulation axis mechanism further has at least one receiving unit. Furthermore, at least one electrical connecting element for electrically connecting the first electrical line to a second electrical line is provided, wherein the electrical connecting element is arranged in the receiving unit. The electrical connecting element has at least one first connecting unit and at least one second connecting unit, wherein the second connecting unit is designed such that it can be rotated relative to the first connecting unit about one axis. The second connecting unit is fixedly arranged on the receiving unit in order to prevent relative movement of the second connecting unit in relation to the receiving unit. The first connecting unit has at least one first contact element which is connected to at least one first sliding contact and on which the first electrical line is arranged. The second connecting unit further has at least one second contact element which is connected to at least one second sliding contact and on which the second electrical line is arranged. The first sliding contact is arranged on the second sliding contact, and the second electrical line is connected to the liquid-crystal film. This embodiment has the advantages which have already been explained further above. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described in greater detail below with reference to exemplary embodiments, in which 
         FIG. 1  shows a schematic illustration of a lower region of a closure element in the form of a refrigerator door; 
         FIG. 2  shows a side view of the closure element according to  FIG. 1 ; 
         FIG. 3  shows a further side view of the closure element which is rotated through 90° with respect to the side view according to  FIG. 2 ; 
         FIG. 4  shows the lower region of the closure element and an upper region of the closure element in a view which is sectioned along line A-A according to  FIG. 2 ; 
         FIG. 5  shows a partially sectioned schematic illustration of an electrical connecting element; 
         FIG. 6  shows a view of a top face of the electrical connecting element, said view being tilted through 90° in relation to  FIG. 5 ; 
         FIG. 7  shows a view of a bottom face of the electrical connecting element, said view being tilted through 90° in relation to  FIG. 5 ; 
         FIG. 8  shows a sectional view through the electrical connecting element along line A-A according to  FIG. 5 ; 
         FIG. 9  shows a sectional view through the electrical connecting element along line B-B according to  FIG. 8 ; 
         FIG. 10  shows a detail view of the region Z according to  FIG. 8 ; 
         FIG. 11A  shows a schematic view of a further closure element; 
         FIG. 11B  shows sectional views through parts of the closure element according to  FIG. 11A ; and 
         FIG. 11C  shows a schematic view for illustrating the arrangement of a liquid-crystal film, which can be activated. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In the text which follows, reference will first be made to  FIGS. 1 to 4 .  FIG. 1  is a schematic illustration of a lower region  12  of a closure element  1  in the form of a refrigerator door.  FIG. 2  is a side view of the closure element  1  according to  FIG. 1 .  FIG. 3  is a further side view which is rotated through 90° with respect to the side view according to  FIG. 2 .  FIG. 4  shows the lower region  12  of the closure element  1  and an upper region  8  of the closure element  1  in a view which is sectioned along line A-A according to  FIG. 2 . For reasons of clarity, the upper region  8  and the lower region  12  of the closure element  1  are illustrated in a manner in which they are not connected to one another in  FIG. 4 . However, it is pointed out that the upper region  8  and the lower region  12  of the closure element  1  are connected to one another and therefore form one unit. 
     The closure element  1  has a first transparent pane element  2 , a second transparent pane element  3  and a third transparent pane element  4 . All three abovementioned transparent pane elements  2  to  4  are formed from glass. As an alternative to this, at least one of the three abovementioned transparent pane elements  2  to  4  can be formed from another transparent material, for example from Plexiglas. The first transparent pane element  2  is directed toward the outside. The third transparent pane element  4  is directed toward an interior of a refrigerator (not illustrated). 
     A liquid-crystal film  5 , which can be activated, is arranged between the first transparent pane element  2  and the second transparent pane element  3 . By applying a voltage to the liquid-crystal film  5  and by switching the voltage on or off, poles of liquid crystals are oriented, so that the liquid-crystal film  5  becomes opaque or transparent. As a result, it is possible to look into the interior of the refrigerator (not illustrated) without opening the closure element  1 . The activation of the liquid-crystal film  5  will be discussed in even greater detail further below. 
     Spacers are arranged between the second transparent pane element  3  and the third transparent pane element  4  in such a way that there is a sealed-off intermediate space  29  between the second transparent pane element  3  and the third transparent pane element  4 . The intermediate space  29  is bounded on all sides by spacers. A first spacer  6  in the lower region  12  of the closure element  1  and a second spacer  7  in the upper region  8  of the closure element  1  are illustrated by way of example in  FIGS. 1, 3 and 4 . All of the spacers, that is to say including the first spacer  6  and including the second spacer  7 , are arranged at a distance from a first edge  11 A of the second transparent pane element  3  and from a second edge  11 B of the third transparent pane element  4 . Therefore, the spacers do not adjoin the first edge  11 A of the second transparent pane element  3  and do not adjoin the second edge  11 B of the third transparent pane element  4 . The intermediate region  11 C between the spacer (the second spacer  7  in  FIG. 4 , for example) and the first edge  11 A or the second edge  11 B can be filled, for example, with silicone in such a way that a particularly good esthetic impression is achieved. 
     The first transparent pane element  2 , the second transparent pane element  3  and the third transparent pane element  4  are designed without a frame in the exemplary embodiment illustrated here. Reference is made to the text further above in respect of the meaning of the term “without a frame”. 
     The intermediate space  29  serves to receive an insulating medium between the second transparent pane element  3  and the third transparent pane element  4 . The insulating medium provided is, for example, air or another insulating gas. 
     An articulation axis mechanism  9  is arranged in a cutout  10  in the second transparent pane element  3  and the third transparent pane element  4 . The articulation axis mechanism  9  has a retaining element  13  which is formed from a first retaining element part  13 A and a second retaining element part  13 B. The first retaining element part  13 A and the second retaining element part  13 B are arranged at an angle of 90° in relation to one another. The second retaining element part  13 B is fixedly arranged between the first transparent pane element  2  and the second transparent pane element  3 . The second retaining element part  13 B is, for example, fixedly adhesively bonded to the first transparent pane element  2  and laminated to the second transparent pane element  3 . However, it should be pointed out that the invention is not restricted to this manner of fastening the second retaining element part  13 B. Rather, any suitable manner of fastening can be used. 
     The first retaining element part  13 A has an opening at which an articulation axis element  14  is arranged. The articulation axis element  14  is formed from a first articulation axis element part  14 A and a second articulation axis element part  14 B. The first articulation axis element part  14 A and the second articulation axis element part  14 B are screwed to one another, wherein the first articulation axis element part  14 A is arranged on that side of the first retaining element part  13 A which is directed away from the cutout  10 , and wherein the second articulation axis element part  14 B is arranged on that side of the first retaining element part  13 A which is directed toward the cutout  10 . 
     The second articulation axis element part  14 B has a receiving unit  15  in the form of a recess in which an electrical connecting element  16  is arranged. The electrical connecting element  16  is illustrated in greater detail in  FIGS. 5 to 10 .  FIG. 5  shows a partially sectioned schematic illustration of the electrical connecting element  16 .  FIG. 6  shows a view of the top face of the electrical connecting element  16 , which view is tilted through 90° in relation to  FIG. 5 . In contrast,  FIG. 7  shows a view of the bottom face of the electrical connecting element  16 , which view is tilted through 90° in relation to  FIG. 5 .  FIG. 8  shows a sectional view through the electrical connecting element  16  along line A-A according to  FIG. 5 .  FIG. 9  shows a sectional view of the electrical connecting element  16  along line B-B according to  FIG. 8 .  FIG. 10  further shows a detail view of the region Z according to  FIG. 8 . 
     The electrical connecting element  16  has a first connecting unit  17  and a second connecting unit  18 . The second connecting unit  18  is fixedly arranged on the receiving unit  15  (cf.  FIG. 4 ). The second connecting unit  18  is, for example, fixedly adhesively bonded in the receiving unit  15 . However, the invention is not restricted to this. Rather, any suitable manner of fastening can be selected in order to fixedly fasten the second connecting unit  18  to the receiving unit  15 . The objective is to prevent relative movement of the second connecting unit  18  in relation to the receiving unit  15 . 
     However, the second connecting unit  18  is designed such that it can be rotated relative to the first connecting unit  17 . To this end, a first ball bearing  19  is arranged at a first end of the first connecting unit  17  and a first end of the second connecting unit  18 . A second ball bearing  20  is further arranged at a second end of the first connecting unit  17  and a second end of the second connecting unit  18 . 
     The first connecting unit  17  has numerous first contact elements  21  on which ends of first electrical lines  22  are respectively arranged. The first electrical lines are routed from the bottom face of the first articulation axis element part  14 A, through a hole, into an interior  23  of the first connecting unit  17 . In each case one first electrical line  22  is arranged on a first contact element  21 . Furthermore, the first connecting unit  17  has numerous first sliding contacts  24  on a side which is directed toward the second connecting unit  18 . In each case one first sliding contact  24  is connected to a first contact element  21 . 
     The second connecting unit  18  can be of two-part design. A first part of the second connecting unit  18  and a second part of the second connecting unit  18  encapsulate the first connecting unit  17  in this exemplary embodiment. As an alternative to this, the second connecting unit  18  can be of integral design. The second connecting unit  18  has numerous second contact elements  25  on which ends of second electrical lines  26  are respectively arranged. The second electrical lines  26  are routed from a top face of the second connecting unit  18  to the liquid-crystal film  5 . The second electrical lines  26  are connected to the liquid-crystal film  5 . The manner in which the second electrical lines  26  are routed can be freely selected in this case. By way of example, the second electrical lines  26  can be routed through a hole in the second transparent pane element  3 . As an alternative or in addition to this, provision is made for the second electrical lines  26  to be routed in grooves which are arranged at the edge of the second transparent pane element  3 . 
     In each case one second electrical line  26  is arranged on a second contact element  25 . Furthermore, the second connecting unit  18  has numerous second sliding contacts  27  on a side which is directed toward the first connecting unit  17 . In each case one second sliding contact  27  is connected to a second contact element  25 . In each case one of the first sliding contacts  24  is in sliding contact with in each case one of the second sliding contacts  27 . 
     The first articulation axis element part  14 A is incorporated into the floor of a housing (for example a refrigerator housing) such that it can rotate. When the closure element  1  is moved from a first position to a second position by rotation about one axis  28  (cf.  FIG. 2 ), the second connecting unit  18  rotates together with the closure element  1 . However, the first connecting unit  17  performs a relative movement in relation to the second connecting unit  18 . An adequate electrical connection to the liquid-crystal film  5  is always ensured on account of the first sliding contacts and the second sliding contacts  27 . The exemplary embodiment illustrated here further has all of the advantages which have already been mentioned further above. 
       FIG. 11A  shows a schematic view of a further closure element  100  in the form of a refrigerator door. The closure element  100  has a door handle  101 .  FIG. 11B  shows sectional views of parts of the closure element  100 , specifically of regions A to C which are identified in  FIG. 11A . The region A is the upper region of the closure element  100 . The region B is the middle region of the closure element  100 . The region C is further the lower region of the closure element  100 .  FIG. 11C  shows a schematic view from above for explaining the arrangement of a liquid-crystal film, which can be activated, which arrangement will be discussed in greater detail further below. 
     The door handle  101  is arranged on a first transparent pane element  103  by means of a clamping connection  102 . The first transparent pane element  103  is, in principle, the front pane of the closure element  100  and is formed, for example, from a single-pane safety glass (SPSG). 
     The closure element  100  further has a second transparent pane element  107 . A liquid-crystal film  104 , which can be activated, is arranged between the first transparent pane element  103  and the second transparent pane element  107 . A first PVB film  105  is arranged between the first transparent pane element  103  and the liquid-crystal film  104 , which can be activated, in order to protect the liquid-crystal film  104 , which can be activated. A second PVB film  106  is further arranged between the second transparent pane element  107  and the liquid-crystal film  104 , which can be activated. 
     Furthermore, the closure element  100  has a third transparent pane element  110  which is arranged at a distance from the second transparent pane element  107  in such a way that an intermediate space  111  is arranged between the second transparent pane element  107  and the third transparent pane element  110 . In order to ensure a secure arrangement, a first spacer  108  and a second spacer  109  are arranged between the second transparent pane element  107  and the third transparent pane element  110 . A gas or a gas mixture is arranged in the intermediate space  111 . The gas or the gas mixture is in the form of, for example, an insulating medium. Air or an inert gas is arranged in the intermediate space  111  for example. 
     The further closure element  100  according to the invention has at least one articulation axis mechanism. The articulation axis mechanism serves to arrange the closure element  100  in an articulated manner on a component, for example a floor of a room or of a device, or for example a floor panel of a room or of a device. The closure element  100  can be moved from a first position (for example an open position) to a second position (for example a closed position) by rotation about one axis for example. 
     The articulation axis mechanism is provided with a first articulation axis unit  112  and a second articulation axis unit  113 . The first articulation axis unit  112  is arranged in the upper region A of the closure element  100 . In contrast, the second articulation axis unit  113  is arranged in the lower region C of the closure element  100 . The first articulation axis unit  112  and/or the second articulation axis unit  113  are/is in the form of bearings which are composed of VA material for example. 
     In the exemplary embodiment of the closure element  100  illustrated in  FIGS. 11A to 11C , a passage  114  is formed in the second articulation axis unit  113 . A first electrical line  115  and a second electrical line  116  are routed through this passage. Said electrical lines are connected to the liquid-crystal film  104 , which can be activated, in order to activate the liquid-crystal film  104 , which can be activated. 
     As is particularly clear from  FIG. 11B , the first transparent pane element  103  is arranged both on the first articulation axis unit  112  and on the second articulation axis unit  113 . Provision is made, for example, for the first transparent pane element  103  to directly adjoin both the first articulation axis unit  112  and the second articulation axis unit  113 . The second transparent pane element  107  and the third transparent pane element  110  are further arranged between the first articulation axis unit  112  and the second articulation axis unit  113 . 
     A first sealing unit  117  is arranged between the first articulation axis unit  112  on the one hand and the second transparent pane element  107  and the third transparent pane element  110  on the other hand. In addition, a second sealing unit  118  is arranged between the second articulation axis unit  113  on the one hand and the second transparent pane element  107  and the third transparent pane element  110  on the other hand. The first sealing unit  117  and the second sealing unit  118  serve, in particular, to seal off the intermediate space  111  between the second transparent pane element  107  and the third transparent pane element  110 . 
     The features disclosed in the present description, in the drawings and in the claims may be essential for implementing the invention in its various embodiments both on their own and in any desired combinations. 
     LIST OF REFERENCE SYMBOLS 
     
         
           1  Closure element 
           2  First transparent pane element 
           3  Second transparent pane element 
           4  Third transparent pane element 
           5  Liquid-crystal film 
           6  First spacer 
           7  Second spacer 
           8  Upper region 
           9  Articulation axis mechanism 
           10  Cutout 
           11 A First edge 
           11 B Second edge 
           11 C Intermediate region 
           12  Lower region 
           13  Retaining element 
           13 A First retaining element part 
           13 B Second retaining element part 
           14  Articulation axis element 
           14 A First articulation axis element part 
           14 B Second articulation axis element part 
           15  Receiving unit 
           16  Electrical connecting element 
           17  First connecting unit 
           18  Second connecting unit 
           19  First ball bearing 
           20  Second ball bearing 
           21  First contact elements 
           22  First electrical lines 
           23  Interior 
           24  First sliding contacts 
           25  Second contact elements 
           26  Second electrical lines 
           27  Second sliding contacts 
           28  Axis 
           29  Intermediate space 
           100  Closure element 
           101  Door handle 
           102  Clamping connection of the door handle 
           103  First transparent pane element 
           104  Liquid-crystal film, which can be activated 
           105  First PVB film 
           106  Second PVB film 
           107  Second transparent pane element 
           108  First spacer 
           109  Second spacer 
           110  Third transparent pane element 
           111  Intermediate space 
           112  First articulation axis unit 
           113  Second articulation axis unit 
           114  Passage 
           115  First electrical line 
           116  Second electrical line 
           117  First sealing unit 
           118  Second sealing unit 
         A Region 
         B Region 
         C Region 
         Z Region