Facade system of metal sections

A facade system of metal sections which receive plate-shaped elements between them such as fixed glazing, sashes, panels or the like which are each provided with an encircling auxiliary frame located exclusively on the room side and connected by releasable connecting means to main frames having means for attachment to a structure, in which: PA1 (a) the facade system consists of several separately formed and individually manipulable main frames into each of which at least one auxiliary frame is inserted; PA1 (b) on the room side, the main and auxiliary frames form a flat reveal extending perpendicularly to the facade plane; PA1 (c) inside this flat reveal, the main and auxiliary frames are spaced a clearance distance from one another which is closed air-tight by an encircling first seal, which simultaneously covers the releasable connecting means between the main and auxiliary frames; PA1 (d) the main frames are air-tightly connected on the room side to the respectively adjacent main frames by a second seal; and PA1 (e) the weather seams between all plate-shaped elements are each closed air-tight by a third seal.

BACKGROUND OF THE INVENTION 
The invention relates to a facade system of metal sections which 
accommodate between them plate-shaped elements such as fixed glazing, 
sashes, panels or the like which are provided in each case with an 
encircling auxiliary frame which is located exclusively on the room side 
and which is connected by releasable connecting means to main frames 
having means for attachment to a building. 
A device of this type is disclosed in published European Patent Application 
Nd. EP-Al No. 0 153 574. Here, the auxiliary frame consists of U-sections 
which, with one of their U-legs, are bonded on the room side via a 
silicone bond, in conjunction with a further adhesive strip, to insulating 
glazing, the U-web being in alignment with the edge area of the insulating 
glazing. The main frame, in both the horizontal and the vertical areas, is 
formed in each case by a section which is common to two adjacent 
plate-shaped elements and which in the horizontal area, with a supporting 
leg, forms the rabbet for accommodating the glazing and also the 
supporting surface for the blocking piece. The intermediate space between 
the edge areas of adjacent insulating glazing parts is filled with a 
polyurethane sealing contact mass which is covered on the weather side by 
a silicone joint seal. In both the horizontal and vertical areas, the main 
frame, with one frame leg in each case, overlaps the associated auxiliary 
frame section, the encircling seal which is provided in this engagement 
area forming a sealing plane lying parallel to the facade plane. In this 
arrangement, the main frame, with said frame leg, in each case 
simultaneously engages the auxiliary frame sections of two adjacent 
insulating glazing parts. Each of the U-shaped auxiliary frame sections is 
engaged by one end of a coupling section which is supported with its other 
end in grooves of the main frame and is braced relative to the latter by 
pressure screws. By tightening the pressure screws, the coupling between 
auxiliary and main frames is secured, and at the same time the seal 
provided between the two frame parts is compressed. The auxiliary frame is 
completely covered on the room side by the main frame and is completely 
covered in the inner area of each plate-shaped element by the coupling 
sections. The function of the auxiliary frame is merely to accommodate the 
coupling sections. In order to cover the area of the coupling screws and 
also the engagement area of the coupling sections in the main frames, 
cover sections are provided which can be clipped in separately and which 
cover the frame system toward the inside and are aligned with the coupling 
sections. 
This previously known facade system is an upright/crosspiece system in 
which the auxiliary frames on the building are inserted into the 
respective bays of this facade. If glass is replaced later, the upright 
and crosspiece casing must first be dismantled, which can involve 
difficulties since movable walls, for example, are mounted on upright 
joints on the room side. 
SUMMARY OF THE INVENTION 
The object of the present invention is to further develop the facade system 
described above in such a way that it permits a large number of design 
possibilities and enables assembly to be carried out largely at the 
manufacturer's works. 
This object is achieved according to the invention by the following 
features: 
(a) the facade system consists of several main frames, each separately 
formed and individually manipulable, into each of which at least one 
auxiliary frame is inserted; 
(b) on the room side, the main and auxiliary frames form a flat reveal 
lying perpendicularly to the facade plane; 
(c) inside this flat reveal, the main and auxiliary frames are at a 
clearance distance from one another which is closed air-tight by a first 
encircling seal which simultaneously covers the releasable connecting 
means between the main and auxiliary frames; 
(d) on the room side, the main frames are connected air-tight to the 
respectively adjacent main frames by a second seal; 
(e) between all plate-shaped elements, the weather seams are each closed 
air-tight by a third seal. 
Thus, in general, the invention comprises a facade system of metal sections 
which receive plate-shaped elements between them which are each provided 
with an encircling auxiliary frame located on the room side of the facade 
and connected by releasable connecting means to main frames having means 
for attachment to a structure, wherein: 
(a) the facade system comprises a plurality of separately formed and 
individually manipulable main frames in each of which at least one 
auxiliary frame is inserted; 
(b) the main and auxiliary frames form a flat reveal extending on the room 
side of the facade perpendicular to the facade plane; 
(c) inside said reveal the main and auxiliary frames have a clearance 
spacing between them which is air-tightly closed by a first encircling 
seal which simultaneously covers said releasable connecting means between 
the main and auxiliary frames; 
(d) the main frames are each air-tightly connected by a second seal on the 
room side to an adjacent main frame; and 
(e) weather seams between adjacent plate-shaped elements are each 
air-tightly closed by a third seal. 
In this arrangement, it is advantageous if a frame leg of the main frame 
overlaps with a bearing surface of the auxiliary frame, which bearing 
surface extends perpendicularly to the facade plane, and if a blocking 
piece is provided between this bearing surface and the frame leg of the 
main frame in order to position the auxiliary frame in the main frame. 
According to the invention it is possible that a main frame is subdivided 
by at least one horizontal cross member which, with a lower and an upper 
auxiliary frame, forms a lower and upper flat reveal on the room side. 
A main frame can therefore accommodate a single plate-shaped element with 
its auxiliary frame, but also several plate-shaped elements with their 
auxiliary frames when one or more cross members are arranged therein. 
The system according to the invention enables the individual elements of 
the facade to be assembled at the manufacturer's premises, the main and 
auxiliary frames likewise being connected to one another at the 
manufacturer's. The separate design of the main and auxiliary frames on 
the one hand facilitates the manufacture of the individual facade elements 
and on the other hand enables an element to be replaced in a previously 
completed facade system, for example as a result of glass breakage. 
The auxiliary frame can be fitted with various segments. In this case, it 
can take on other functions, for example as a bearer for additionally 
suspended auxiliary sections, or auxiliary sections attached in some other 
way. The auxiliary frame can have a bonding leg which extends parallel to 
the facade plane and, together with a seal and the lateral edge of a 
plate-shaped element, forms a groove which is open toward the adjacent 
auxiliary frame and is filled with a silicone adhesive which firmly bonds 
the plate-shaped element to the bonding leg of the auxiliary frame. The 
individual plate-shaped element therefore requires no auxiliary frame on 
the weather side, so that the facade system as a whole does not reveal any 
sections on the weather side. A glass-only facade is therefore possible. 
However, since a construction of this type is not yet permitted 
everywhere, it can be arranged that adjacent frame legs of adjacent or 
superposed main or auxiliary frames form between them an undercut groove 
for accommodating a tensioning bolt which protrudes outward on the weather 
side between two plate-shaped elements and serves to attach cover strips 
or the like which overlap these elements on the weather side. 
So that auxiliary and main frames can be simply and reliably connected to 
one another, but also so that they can be released again from one another, 
it is advantageous if the releasable connecting means consists of a 
U-shaped clamp which can be moved within the facade plane, and if in the 
coupling position the U-legs of the clamp, extending parallel to the 
facade plane, overlappingly engage a retaining leg on each of the 
auxiliary and main frames. So that even high forces can be reliably 
transmitted, it is at the same time advantageous if at least one retaining 
leg has an undercut, behind which, in the coupling position, a lug 
disposed on a U-leg of the clamp engages. In this respect, the U-web of 
the clamp may have a continuous internal thread which extends parallel to 
the U-legs and into which a freely rotatable coupling screw mounted in a 
frame leg is screwed. 
So that assembly and disassembly can be carried out from different sides, 
it is advantageous if the coupling screw has a recess in each of its two 
ends for a rotary turning tool, preferably a hexagonal socket. 
Accessibility of the coupling screws is facilitated when one end of each 
screw is aligned with the clearance space between the auxiliary and main 
frames. In this way, an additional advantage is simultaneously achieved 
that the seal covers the screws and protects them from soiling, and at the 
same time ensures a visually attractive overall appearance.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
FIG. 1 shows a vertical section through a joint between two facade elements 
which are arranged one above the other and are in each case fitted with 
insulating glazing. Each facade element consists of a main frame 2 into 
which an encircling auxiliary frame 1 is inserted which is fitted with a 
plate-shaped element in the form of fixed glazing 40 and is connected to 
the associated main frame 2 by a releasable coupling. 
The detachable coupling comprises a U-shaped clamp 3 which can be displaced 
inside the facade plane and the U-leg 3a of which, lying parallel to the 
facade plane, in the coupling position, engages each of the auxiliary and 
main frames 2 and 1 through a retaining leg 6, 7. The U-web 3b of the 
clamp 3 has a continuous internal thread 5 which extends parallel to the 
U-legs 3a and into which a coupling screw 4 is screwed which is mounted in 
a frame leg 8 so as to be freely rotatable therein, and which with its 
other end, is in alignment with a clearance space a between the auxiliary 
and main frames 1 and 2. The coupling screw 4 has a hexagonal socket 9 in 
each of its two ends for a rotary turning tool, is supported by a head 4a 
on the side of the frame leg 8 remote from the clamp 3, and is secured on 
the opposite side of the frame-leg by a Seeger ring 10. 
The frame leg 8 is disposed on the main frame 2 and overlaps with a bearing 
surface 11 of the auxiliary frame 1, whereby in this overlap area in the 
upper horizontal region, a seal 12, but otherwise a blocking piece 13, is 
provided. At least one retaining leg 6 of the auxiliary frame 1 has an 
undercut 6a, behind which, in the coupling position, a lug 3c disposed on 
a U-leg 3a of the clamp 3 engages. 
On the room side, the main and auxiliary frames form a flat reveal 1b and 
2b extending perpendicular to the facade plane, inside which reveal 1b and 
2b the two frames are at the above-mentioned clearance distance a from one 
another which is closed air-tight by a first encircling seal 14 which at 
the same time covers the coupling screws 4. As a result of the seal 14, 
each auxiliary frame 1 and 1', respectively, is inserted largely air-tight 
into the associated main frame 2 and 2', respectively. As a result of the 
seal 12 additionally provided in the upper horizontal area, it is 
simultaneously ensured that moisture possibly penetrating on the weather 
side cannot penetrate into the engagement area between the auxiliary and 
main frames and therefore into the coupling area. Rainwater therefore 
remains in front of the seal 12 on the auxiliary section or runs downward 
in this area between the plate-shaped elements in the facade and can be 
drained off at this location. 
The clearance space b between each two main frames 2, 2' arranged laterally 
or vertically adjacent one another is closed air-tight on the room side by 
a second seal 16, which according to the illustrative embodiment is an 
encircling collapsible seal pressed into a groove 15, 15' in each of the 
two main frames. In addition, a strip-shaped cover 17 is provided on the 
room side between the two main frames 2, 2', which cover 17 is pushed into 
opposing grooves 18, 18' of the two main frames and can be covered by a 
clipped-on cover strip 52. 
The main frame 2 comprises a box section 19 into which a stiffening piece, 
a vertical connection to the overlying or underlying main frame 2', or a 
corner angle is pushed. Each two main frames 2, 2' arranged next to one 
another enclose a cavity 23 which is approximately rectangular or square 
in cross section and into which is pushed a steel tube 24 which is fitted 
to this cross section (FIG. 4). 
FIG. 2 shows a vertical section through a horizontal cross member 25 which 
subdivides a main frame. The lower and upper auxiliary frames 1, 1' 
respectively are each fitted with fixed glazing 40. The auxiliary frame 1 
or 1' respectively comprises a box section 28 into which a corner angle 
(not shown) can be pushed. The heads 4a of the coupling screws 4 are 
guided in an undercut groove in the frame leg 8 so that the Seeger ring 10 
for securing the coupling screw 4 can be omitted. So that the hexagonal 
socket 9 provided on the screw head side can be used, slotted holes (not 
shown) can be provided in the frame leg 8 between the screw heads 4a which 
are vertically offset opposite one another, the slot width of which 
slotted holes is smaller than the diameter of the screw head. 
According to FIGS. 1 and 2, the auxiliary frame 1 has a bonding leg 31 
which extends parallel to the facade plane and, together with a seal 32 
and the lateral edge of the fixed glazing 40, forms a groove 34 which is 
open toward the adjacent auxiliary frame 1' and is filled with a silicone 
adhesive 35 which firmly bonds the fixed glazing 40 to the bonding leg 31. 
In the embodiment according to FIG. 1, the clearance space between the two 
auxiliary frames 1, 1' arranged one above the other is closed on the 
weather side by an encircling collapsible seal 46 pressed into a groove 44 
of each clipped-in auxiliary section 45. This auxiliary section 45 has a 
supporting leg 38, the supporting surface 38a of which, extending 
perpendicularly to the facade plane, accommodates a blocking piece 39 and 
also a sealing contact mass 36 with a silicone joint seal 37 for the fixed 
glazing 40. 
In the embodiment according to FIG. 2, an auxiliary section 45 is merely 
clipped into the auxiliary frame 1' shown in the left-hand half of the 
drawing. In this embodiment, the intermediate space between the adjacent 
glazing parts 40 is filled in each case with a sealing contact mass 36, 
which is covered on the weather side by a silicone joint seal 37. 
FIG. 3 shows a schematic representation of a horizontal section through a 
90.degree. facade corner, the two facade elements each being fitted with a 
fixed glazing 40. An upright 30 formed as a hollow section is built into 
the auxiliary frame running around the facade corner area. The actual 
corner area is formed by a correspondingly formed cover section 47 which 
can be connected to the upright 30 via screws 48. The gaps between the 
cover profile 47 and fixed glazing 40 are in turn filled with a sealing 
contact mass 36 and a silicone joint seal 37 on the weather side. 
In FIG. 4, the left-hand half of the drawing shows that the supporting leg 
38 can also be formed integrally with the auxiliary frame 1 or 1'. Here, 
the supporting leg 38 accommodates a window frame 41 for a sash 42. 
FIG. 8 shows the main frame 2, 2' subdivided by at least one horizontal 
cross member 25. 
In the embodiment according to FIG. 5, a plate element 33, for example a 
laminated safety glass, is bonded to the auxiliary frame 1' by a silicone 
bond 35. The intermediate space toward the supporting leg 38 is again 
filled with a sealing contact mass 36 together with a silicone joint seal 
37 on the weather side. Otherwise, in this construction, the supporting 
leg 38 forms a connection to an empty space which can be filled on the 
building side with a separate element 43 (not shown in greater detail). 
The vertical section of the auxiliary frame 1' is suspended, by means of a 
pin 26 lying horizontally within the facade plane, in an undercut groove 
27 in the main frame 2'. 
In all embodiments, it is possible in principle, in addition to the 
silicone bond 35, and if necessary also instead of this silicone bond, to 
provide cover strips 51 which, on the weather side, overlap the edge area 
of the plate-shaped elements 33; 40; 41, 42; 43 and, on the room side, are 
fastened onto or between adjacent main frames. An exemplary arrangement 
for this purpose is shown in broken lines in FIG. 2. The two adjacent 
frame legs 8 form between them an undercut groove 49 for receiving a 
tensioning bolt 50 which protrudes outwardly on the weather side between 
two facade elements and serves to attach cover strips 51 or the like which 
overlap the plate-shaped elements on the weather side. 
FIG. 4 shows a facade system with a conventional window frame 41 for a sash 
42. The metal sections located on the weather side in this construction 
are disadvantageous because the fixed glazing 40 provided next to the sash 
in the illustrated embodiment has no metal sections at all which overlap 
the glazing on the weather side. FIG. 6 shows a vertical section through a 
horizontal cross member 25 with lower fixed glazing 40 and an upper sash 
42. A second auxiliary frame 53, which receives the sash 42, is attached 
in the vicinity of the sealing contact mass 36 and the silicone joint seal 
37 which close the head joint between two adjacent plate-shaped elements. 
In this case the seal 14 between main and auxiliary frames serves at the 
same time as a stop seal for the sash 42. Here, therefore, all metal 
sections are omitted in the visible area of the facade. In the area of the 
"window frame", although a silicone joint seal is obtained which is twice 
as wide, it is hardly noticeable in the overall appearance of an "all 
glass" facade. 
In all embodiments according to the invention, the auxiliary frame lies in 
the visible area and is designed so that it is suitable for accommodating 
various elements. Its depth is adequate for accommodating, for example, 
spandrel or facing elements or the like; the coupling also remains 
accessible in the case of correspondingly deep insulation or 
correspondingly deep spandrel or facing elements. 
FIG. 7 shows a horizontal section through the adjacent edge area of two 
main frames 2, 2' which are attached to a structure 62 by auxiliary means 
22. These means 22 each comprise a horizontal pin 55, one end of which is 
pushed through a bore provided in the main frame 2 or 2' until it abuts 
against a projecting portion 57 of this main frame. The pin 55 is secured 
in this position by a Seeger ring 56. The bore is closed air-tight by 
means of an O-ring 58. Pin 55 is suspended with its other end in an 
L-shaped stamped-out portion 59 of a retaining part 54 previously attached 
to structure 62. The retaining part 54 is formed as a U-section, in the 
U-legs of which the stamped-out portions 59 are arranged, as can be seen 
from the reduced scale partial perspective illustration. 
In the main frame 2' shown on the left-hand side in FIG. 7, the connection 
to the associated auxiliary frame 1' is effected via screws 61 instead of 
the clamp 3, which screws 61 connect a web 60 of the auxiliary frame 1' to 
the frame leg 8 of the associated main frame 2'. 
The second seal 16 between the main frames as well as the third seal 36, 37 
or 46 serve to absorb building tolerances, building vibrations or the 
like; the collapsible seal 46 being provided as a rule only in the case of 
a horizontal joint between vertically adjacent main frames, where larger 
tolerances are to be absorbed. In a vertical joint between two laterally 
adjacent main frames, only material (thermal) expansion differences occur 
as a rule, and these can be readily absorbed by a silicone joint seal 37. 
Since the cross member 25 subdividing the main frame need not absorb any 
building movements, an elastic connection is not required between the 
plate-shaped elements or auxiliary frames inserted into a main frame, so 
that the cross member 25 on the room side can be made box-shaped and in 
one piece. 
In the construction according to the invention, each individual 
plate-shaped element can be replaced individually after the weather seam 
is cut open. All main frames are air-tightly connected by the second seal 
16 to one another on the room side, while all auxiliary frames are 
air-tightly installed by the first seal 14 in each case in the associated 
main frame. The second seal 16 and also the strip-shaped guides 17 or the 
cover strips 52 move with any building movements. 
It can be seen from FIG. 5 in particular that the main frame 2, 2' has an 
undercut groove 63 into which, when the main frames are arranged one above 
the other, a flat steel bar 64 is pushed which bridges the horizontal 
joint and which is shown in broken lines in FIG. 5. This vertical guide in 
the area of the horizontal joint is of particular advantage when the 
thusly interconnected main frames form the end piece of a facade. 
In the various embodiments, the fixed glazing 40 is shown bonded to the 
bonding leg 31 (see, e.g., FIG. 1). The seal 32 provided here fulfills 
several functions: besides its function as a bearing seal, it serves to 
form a clean joint between, for example, the fixed glazing 40 and the 
bonding leg 31; in addition, however, it is used to limit the silicone 
bond 35 which fills the groove 34. The seal 32 forming the base of the 
groove, on its side facing toward the bond, is firmly secured to this bond 
which in turn is firmly bonded to the plate-shaped element on the one side 
and to the bonding leg 31 on the other side. Suction acting on the 
plate-shaped element leads to deformation of this element and thus also to 
deformation of the bond in such a way that the latter contracts in the 
area facing toward the seal 32, therefore moving away from this seal. But 
since there is a fixed bond in this area with the seal, the latter has to 
be made so that it can follow this deformation without the adhesive 
connection between the bond and the seal tearing. For example, the sealing 
section 32a bonded to the silicone adhesive 35 can be formed as a hollow 
body which allows a corresponding deformation. However, the section 32a 
can also be connected to the remaining body of the seal 32 by a center web 
of relatively thin dimensions. 
The foregoing description has been set forth merely to illustrate the 
invention and is not intended to be limiting. Since modifications of the 
described embodiments incorporating the spirit and substance of the 
invention may occur to persons skilled in the are, the scope of the 
invention should be limited solely with respect to the appended claims and 
equivalents.