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TECHNICAL FIELD OF THE INVENTION 
       [0001]    The present invention relates to a façade glazing element having stepped glazing with at least a first (outer) and a second (inner) window pane, the dimensions of the first window pane exceeding the second window pane by a certain amount, hereinafter also referred to as “overlap”, and relates to façade glazing using the façade glazing element. 
       PRIOR ART 
       [0002]    A metal/glass façade is known from GB-A-2 167 784. It is formed from a bearing frame and a few support frames for a double glazing. The bearing frame is formed by horizontal and vertical metal hollow profiles. The support frames are formed by metal profiles in which insulating glazing has been glued. These metal profiles for the support frames for the glazing are stepped, the outer glass of the insulating glazing being glued to a first step and having outer dimensions that are at least equal to the outer dimensions of the support frame. The inner glass of the insulating glazing is glued to the second step of the metal profile. The metal profile possesses an arm that projects inward from the inner glass and that can be placed from outside over the hollow profile of the bearing frame and screwed thereto. Inserted between the bearing frame for the façade and the support frame for its glazing are nylon profiles that are called screw anchors. The support frame can be clicked over these nylon profiles from outside and is held by them until fixation by means of screws. The fixation screws are screwed into the hollow profile of the bearing frame parallel to the glazing plane on the inside of the insulating glazing through the arm of the metal profile of the support frame, which arm extends inward, and through the screw anchor. 
         [0003]    There is a need, particularly in housing construction, to be able to produce such whole glass facades as wood structures, as well. 
         [0004]    Known from DE-U-203 09 960 is a façade glazing with wood frame windows. This façade glazing includes fixed glazing and window wings. The outer glass pane of the insulating glazing used is larger than the inner glass pane. This stepped glass is glued into the wood frame, for the window wing it is glued into the wing frame, and for the fixed glazing it is glued into the window frame. The outer glass pane in the fixed glazing and also in the closed position for the wing glazing is placed on a rubber seal that is anchored in a metal profile. This metal profile is screwed to the side of the window frame. The window frame is joined to the building. It follows from the aforesaid that the fixed glazing can only be mounted in the window frame from the outside and, in order to exchange glazing, the adhesive join between the fixed glazing and the window frame has to be removed and therefore it is highly probable that the window frame will be damaged. 
       OBJECT OF THE INVENTION 
       [0005]    Proceeding from this prior art is the object of providing an improved façade glazing as a wood structure that can be mounted with little complexity. Another goal is to improve the fastening of the glazing such that fixed glazing elements can be exchanged without having to damage the bearing structure. It is also desirable to be able to do without outer scaffolding. 
       DESCRIPTION OF THE INVENTION 
       [0006]    In accordance with the invention, the object is attained using a façade glazing element in accordance with the preamble to claim  1  and using a façade glazing in accordance with claim  7 . In an inventive façade glazing element, the wood frame into which the stepped glazing is glued is a mounting frame that can be removed from the bearing structure. The first window pane and the second window pane are each securely glued on the edge to the mounting frame by means of a first and a second adhesive agent layer, and on the room side there is a fastening option or fastening device on the mounting frame for fastening the façade glazing to a façade. The inventive façade glazing element has the advantage that it can be fastened to a bearing structure and can also be released from it from inside. This means that no scaffolding is necessary for mounting or replacing the element. Another advantage of the façade glazing element is that its stepped glazing is securely joined to the mounting frame by adhesive agent at two annular perimeter locations that are disposed in two planes spaced apart from one another. Thus the risk that the glazing could loosen is greatly reduced compared to the known façade glazing glued to wood frames. 
         [0007]    Although the mounting frame can comprise solid wood with its grown structure over the entire cross-section of the frame profile, it is still advantageously made of plywood. Plywood has the advantage that it is a more cost-effective material that has only low heat conductivity but compared to solid wood has greater loading capacity and lower warpage. In accordance with one preferred embodiment, in its cross-section the mounting frame has an L-profile having two legs, this defining a rabbet for receiving the stepped glass. The first window pane is usefully securely glued to the end face of the one leg and the second window pane is securely glued to the inside or flank of the second leg oriented toward the first leg. A particularly stable and stiff bond can be created by the two adhesive bonds in two planes that are separated from one another and that are between the double glazing and the mounting frame. 
         [0008]    Usefully, the mounting frame and the stepped glazing have practically the same dimensions. Therefore the mounting frame is approximately aligned with the edges of the first window pane around the perimeter. This permits a plurality of façade glazing elements to be arranged adjacent to and/or above one another. The fastening option or fastening device is advantageously provided on the mounting frame jamb. This makes it possible to secure the façade glazing element to a bearing structure on the room side of the window pane. For fastening the façade glazing element, a plurality of holes for receiving fastening means can be provided on the mounting frame jamb. These extend parallel to the glazing through the mounting frame. Alternatively bolts, pins, or screws can be inserted perpendicular to the glazing and can then engage in the bearing structure and can be mounted, screwed, or bolted on the room side. 
         [0009]    The subject-matter of the present invention is also a façade glazing having a bearing structure in which a façade opening is formed for receiving a façade glazing element, into which façade opening the façade glazing element is placed as fixed glazing. 
         [0010]    For fastening the façade element, the mounting frame has a recess, opposite the jamb, embodied on two opposing sides or even around the perimeter, so that there is for instance an S profile in the area with the recess. In addition, the bearing structure has a projection that projects at a right angle to the window opening, maximally the size of the recess, so that the façade glazing element with the recess abuts the projection. Thanks to the overlapping of the mounting frame and the projection, it is possible to screw or bolt the mounting frame to the projection. The bearing structure is advantageously embodied at least on two opposing sides of the façade glazing element. For smaller façade glazing elements, a bearing structure that is present on only two opposing sides is adequate for sufficient fastening. Preferably the façade glazing element is screwed, bolted, pinned, or anchored to the bearing structure through the mounting frame jamb. However, it is also conceivable for screws, bolts, or the like to be used, at a right angle to the window glazing, that can engage the bearing structure in corresponding holes. The screws or bolts can then be fastened on the room side using a tightening element that is similar to a tightening element used for furniture. 
         [0011]    The subject-matter of the present invention is also a method for producing a fixed façade glazing that includes the following method steps: 
         [0012]    Producing a façade glazing (bond) element by producing a mounting frame made of wood or wood material having certain dimensions; producing a stepped glazing matched to the dimensions of the mounting frame and, by joining stepped glazing and mounting frame and gluing the edge of the stepped glazing to the mounting frame, providing a bearing structure, that has a façade opening that corresponds to the size of the façade glazing element; 
         [0013]    From the outside, placing the façade glazing element into the façade opening and screwing, bolting, or mounting it on the room side to the bearing structure. The inventive method has the advantage that these façade glazing elements that form a fixed glazing can be produced independent from the bearing structure and can be joined thereto at the construction site without screwing or gluing from the outside. Thus no scaffolding is necessary to place the façade glazing element into the façade opening. Furthermore, the façade glazing elements can be replaced at any time without it being necessary to impact adjacent glazing elements or even the bearing structure. 
     
    
     
         [0014]    The invention is described in greater detail in the following, with reference to the figures, using an exemplary application. The same numbers are used to identify identical parts in the figures. 
           [0015]      FIG. 1  is a schematic depiction and horizontal section of a detail view of an inventive façade glazing element fastened to a bearing structure; 
           [0016]      FIG. 2  is a detail view of an inventive façade glazing having two façade glazing elements abutting one another; 
           [0017]      FIG. 3  is another variant of an inventive fixed façade glazing having triple glazing; 
           [0018]      FIG. 4  is the same variant as in  FIG. 3 , but with double glazing. 
       
    
    
       [0019]    The fixed façade glazing depicted in  FIGS. 1 and 2  has a façade glazing element  33  with a stepped insulating glazing (hereinafter also referred to simply as “stepped glass”) having an outer window pane  13  and an inner window pane  15 . Outer and inner window panes  13 ,  15  are securely glued to one another by means of a spacer element  17 . The façade glazing element  33  is securely joined to a mounting frame  35  by means of a first and a second adhesive agent layer  37 ,  39 . The mounting frame  35  has an L profile, the first adhesive agent layer  37  being disposed between the end face  41  of the first leg  43  and the outer window pane  13  and the second adhesive agent layer  39  being disposed on the inside  45  of the second leg  47 . 
         [0020]    Adhesive agents that can be used for joining the glass and wood can be double-sided adhesive tapes or reactive adhesives, for instance. In particular the inner adhesive bond can be formed by a double-sided adhesive tape. The outer adhesive bond can be formed by a heat-reactive polyurethane adhesive or by a silicone or ac late-based two-component adhesive (also reactive adhesives). When hardened the adhesive usefully ensures tensile shear strength that is greater than 1 MPa. However, the maximum tensile shear strength is preferably 12 MPa. Experiments have demonstrated that the adhesive should have a maximum Shore hardness of A 90 or D 50 to attain the best possible noise damping for the façade elements. 
         [0021]    A bore hole  49  that receives a fastening screw  61  runs through the end face  51  of the second leg  47 . 
         [0022]    The façade glazing element  33 , with the mounting frame  35 , is mounted on a bearing structure  53 . The bearing structure  53  can be a post, a wall, or for instance a frame. The bearing structure  53  has a projection  55  against which the mounting frame  35  can be positioned. In accordance with the depicted exemplary embodiment, the mounting frame  35  has a recess  57  that corresponds approximately to the dimensions of the projection  53  [sic] so that the assembly frame  35  can be positioned in a form fit against the projection  55 . Screws, bolts, or other fastening elements are screwed into the projection  55  through the end face  51  and the bore hole  49  for fastening the façade glazing element  33  to the bearing structure  53 . This type of fastening has the advantage that it can be performed from the interior of the room. The end face  51  of the second leg can be covered with a cover strip  56 . 
         [0023]    Preferably the mounting frame comprises plywood. Plywood has the advantage that it has poor heat conductivity but good stability. In addition, there are commercially available adhesives that permit a reliable bond, that is stable for the long term, between mounting frame and window pane. Since the projection  55  must be able to deflect the entire wind load, an additional reinforcing element  59  can be provided for glazings that have a poor surface-to-perimeter ratio. The reinforcing element can be for instance a metal plate, a strip of sheet metal, an angle bar, or other means that have the same effect. 
         [0024]    As can be seen from  FIG. 2 , a plurality of façade glazing elements can be arranged adjacent to one another. However, it is also conceivable to alternate fixed façade glazing elements with windows that can be opened. 
         [0025]      FIG. 3  depicts a variant of a fixed façade glazing that is used in a wall opening  63  of a façade wall  65 . In contrast to the first exemplary embodiment, the mounting frame  35  is held by an angle bar  66 . The angle bar  66  is screwed to the bearing structure  53  by means of screws  67 . The window glazing element is itself securely screwed to the angle bar  66  by the screws  61 . It is also clear from the described example that the window glazing can also include more than two window panes. An insulating material  69  is present between the façade glazing element and the façade wall  65 . A sealing strip  71  is inserted both inside and outside in the gap between the façade wall  65  and the façade glazing element, which prevents water from penetrating.  FIG. 4  depicts the same embodiment, but with only double glazing. 
         [0026]    The present invention relates to a façade glazing element having a stepped glazing with a first and a second window pane, the dimensions of the first window pane exceeding the second window pane by a certain amount. The first and the second window panes are each securely glued on the edge to a mounting frame by means of a first and a second adhesive agent layer. A room-side fastening option or fastening device is provided on the mounting frame for fastening the façade glazing to a façade. Thanks to the room-side fastening option for the façade glazing element, disassembly is possible without damaging the surrounding components or connections to the building, so that for instance simple repair glazings are possible 
       LEGEND 
       [0000]    
       
           11  Façade glazing 
           13  Outer window pane 
           15  Inner window pane 
           17  Adhesive layer 
           19  Metal profile 
           21  Claw 
           23  Pocket 
           25  Screw 
           27  Post 
           29  Sealing tape 
           31  Silicone joint 
           33  Inventive façade glazing element 
           35  Mounting frame 
           37  First adhesive agent layer 
           39  Second adhesive agent layer 
           41  End face of the first leg 
           43  First leg of the L profile 
           45  Inside of the second leg 
           47  Second leg 
           49  Bore hole 
           51  End face of the second leg 
           53  Bearing structure 
           55  Projection 
           57  Recess 
           59  Reinforcing element 
           61  Fastening screw 
           63  Wall opening 
           65  Façade wall 
           67  Screws 
           69  insulating material 
           71  Sealing strip

Summary:
The present invention relates to a facade glazing element having a stepped glazing with a first and a second windowpane ( 13, 15 ), wherein the dimensions of the first windowpane ( 13 ) exceed those of the second windowpane ( 15 ) by a specified amount. The first and second windowpanes ( 13, 15 ) are each firmly bonded at their edge to a mounting frame ( 35 ) made of wood or wood-based material by means of a first and a second adhesive layer ( 37, 39 ). On the mounting frame ( 35 ) is provided a room-side fastening possibility or fastening means for fastening the facade glazing to a facade. By virtue of the room-side fastening possibility for the facade glazing element, disassembly is possible without damaging the surrounding components or connections to the building, thereby making repair glazing, for example, easily possible.