Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
1222~6~ 23724-115
The invention relates to a composite heat-insulating
section, more particularly for window-frames or door-frames,
consisting of two profiled metal bars or frame members united by
an insulating element, the said profiled metal bars comprising,
on both longitudinal sides of the insulating element, continuous
strips engaging in recesses in the said insulating element; an
intermediate web, engaging in a groove in the said insulating
element, being provided on each profiled bar between the said
continuous strips, the said webs running at an angle to the said
continuous strips on one longitudinal side of the said insulating
element, and the width of the said grooves being greater than the
thickness of the said intermediate webs and the continuous strips
towards which the intermediate webs are directed, the strips being
deformed by pressure from the outside whereby to press the
insulating element onto the profiled metal frame members in the
area between the intermediate webs and the continuous strips and
provide the insulating element on a side facing away from the
intermediate webs with edge strips.
A composite heat-insulating section of this kind is
known (German OS 29.11 832), in which the lower part of the
insulating element is held by appropriate positive guides to the
relevant profiled metal sections. It has been found, however,
in practice that where production-tolerances or production-
inaccuracies arise, especially in the case of the grooves let
into the insulating element for the accommodation of corresponding
webs in the profiled metal bars, the lower parts of the said bars,
i.e. the parts acted upon by the positive guides, are not
lZZ2~6S
23724-115
adequately held by the said insulating element. This leads to
composite sections which lack dimensional stability and in which
the profiled metal bars are not parallel with each other.
It is the purpose of the invention to provide a
composite heat-insulating section, of the type mentioned at the
beginning hereof, in such a manner as to ensure positional
stability of the profiled metal bars and insulating element, in
spite of production-tolerances and production-inaccuracies in
the components constituting the section.
According to the invention, this purpose is achieved
in that each edge strip engages in a pick-up groove of each
profiled metal frame member equipped with a pivotable and cold-
formable inner web, that an inner web forms an inner wall of the
pick-up groove and is pivotable about an axis running parallel
to the longitudinal direction of the associated profiled metal
frame member, that there is a gap between the bottom of the pick-
up groove and an end strip and that the end strip is clamped
between the inner web and the inner wall of the profiled metal
frame member.
According to one advantageous example of embodiment of
the invention, edge-strips, provided in the corner-areas of the
insulating element, bear with their lateral boundary surfaces,
frictionally against the inner walls of the profiled metal frame
members (or bars).
: This produces, in the four corner-areas of the insulating
element, reliable bracing between the said elements and the said
bars, thus compensating for production-tolerances and production-
-- 2 --
!- i,'
"` ~LZ'~ 65
23724-115
inaccuracies in the components constituting the section.
Vertical bracing between the profiled metal frame members
and the insulating element is effected by means of non-deformable
intermediate webs, engaging in grooves in the insulating element,
and continuous deformable strips on the profiled metal frame
members. Since only the continuous strips running along the
insides of the profiled metal frame members are deformed, the
visual surfaces of the profiled metal frame members are held
parallel with each other. Vertical displacement is also prevented.
For the purpose of increasing the insulating effect,
while still retaining a highly stable insulating element, two or
four cavities, serving as air-chambers, are preferably provided
within the said insulating element.
The invention also covers a method for producing a
heat-insulating composite section consisting of two-spaced-apart
profiled metal frame members united by a spacing insulating
element, the said profiled frame members comprising on both
longitudinal sides of the insulating element, continuous inwardly
directed strips engaging in recesses at the top and bottom of the
insulating element; an inwardly directed intermediate web, engag-
ing in a groove in the said insulating element, being provided
on each profiled frame member between the said continuous strips,
the said intermediate webs running at an angle to the continuous
strips and the width of the grooves being greater than the
thickness of the intermediate webs and the continuous strips
towards which the intermediate webs are directed, the strips
being deformed by pressure from the outside whereby to press the
- 3 -
,~ .
.iZ2Z~65 23724-115
insulating element onto the profiled metal frame members in the
area between the intermediate webs and the continuous strips and
providing the insulating element on a side facing away from the
intermediate webs with edge strips, characterized in that each edge
strip engages in a pick-up groove of each profiled metal frame
member equipped with a pivotable and cold-formable inner web,
that an inner web forms an inner wall of the pick-up groove and
is pivotable about an axis running parallel to the longitudinal
direction of the associated profiled metal frame member, that
there is a gap between the bottom of the pick-up groove and an
end strip and that the end strip i5 clamped between the inner
web and the inner wall of the profiled metal frame member, which
method is characterized in that the insulating element is pushed
into the continuous strips and pick-up grooves of the profiled
metal frame members, and onto the lateralintermediate webs on the
said frame members and in that, subsequentially,pressure is
applied, from the outside, by means of pressure applying means
to the top continuous strips whereby the said top continuous
strips are pressed obliquely and downwardly into the insulating
element, while the bottom continuous strips are pressed upwardly
into a correspnding horizontal position into the said insulating
element and the edge-strips are pressed against the said profile
metal frame members in such a manner that the said insulating
element is caused to bear frictionally against the said frame
members in all areas of contact.
This produces a strongconnection between the insulating
element and the profiled metal bars and maintains an accurate
,:
~ - 3a -
"`-`'
23724-115
1~;22~65
overall sectional depth. The components constituting the
composite section are clamped together both vertically and
horizontally, even major production tolerances being compensated
for by the play existing initially between the said components.
Examples of embodiment of the composite section
according to the invention are illustrated in the drawings
attached hereto and are explained hereinafter. In the said
drawings:
Figure 1 is a cross-section through a composite section
in the not completely assembled condition;
Figure 2 shows the composite section according to
Figure 1 in the completely assembled condition;
Figure 3 is a modification of the design according to
Figures 1and 2;
Figure 4 shows cross-sections of a casement-frame and
window-frame made from the composite section according to the
inventlon .
The composite sectionconsists of profiled metal bars
1, 2; 1a, 2a and a profiled, dimensionally stable insulating
element 3 made of synthetic material. The insulating element
in the example according to Figures 1 and 2
- 3b -
~,, ~,"
" lZ2216S
contains four cavities 4 designed as air-chambers, the webs between the said
cavities being designed as diagonals S of the said insulating element.
In the example of embodiment according to Figure 4, the insulating
element is equipped with two cavities 4.
The profiled metal bars (or frame members) comprise, near their
upper ends and externally of the insulating element uniting them, continuous
strips 6, 7 which initially extend horizontally, the under surface of each strip
carrying a cam-like surface 8 associated with a corresponding recess 9 in the
said insulating element. In addition to this, the sides of the insulating
element facing the profiled metal bars are provided with grooves 10, 11 directed
obliquely upwardly into the interior of the element, into each of which an
intermediate web 12, 13, projecting from the said metal bars, projects. The
width of oblique grooves 10, 11 is substantially greater than the thickness of
intermediate webs 12, 13. Each of the said webs carries, at the transition
between it and the profiled metal bar, a continuous groove 14 into which the
tip of edge-strip 15 of the insulating element projects. The said insulating
element also comprises a nose 16 projecting centrally from its under-surface,
the said nose serving as a stop for the window-frame when the composite section
is used as a casement frame.
In the example of the embodiment according to Figures l and 2, a
lower hooked strip 17, 18 is fitted to each profiled metal bar 1, 2 facing upper
strip 6, 7. Even in the unbraced condition shown in Figure l, each strip 17,
18 engages in a corresponding groove l9 in insulating element 3. Web 20 of
strip 17, 18 is inclined downwardly, at an angle of about 10, in relation to
transverse plane 21 of the said bars, whereas the angle between the inside of
hook 22 on strip 17, 18 and plane 23 running parallel with the bars is about
20 The angle between the lateral walls of groove 19 and parallel plane 23
-- 4 -
122Z165
is accordingly also about 20. The transition from the inside of hook 22 andthe inside of web 20 of strip 17, 18, and the transition from the lateral wall
of groove 19 nearest to the relevant profiled metal bar to the under-surface
of insulating element 3, are both rounded, as are the transitions from the
bottom of the groove to the lateral walls thereof. The transition from the
upper surface of hook 22 on strip 17, 18 to its rear surface is also rounded,
as is the transition from the outside of web 20 to the relevant profiled bar.
The thickness of hook 22 corresponds to the thickness of web 20 of the said
strip. A continuous groove 24, serving as a predetermined bending location, is
let into the inside of web 20 at the junction with the relevant profiled metal
bar. The end of hook 22 on strip 17, 18, which engages in the lateral wall
of groove l9, is pointed.
In producing the composite section according to Figures 1 and 2,
upper strips 6, 7 are pressed down, preferably by rollers, pressure-slides, or
the like, simultaneously or consecutively, from the horizontal position shown
in Figure 1, so that, on the one hand, cam-like surfaces 8 engage with recesses
9 in insulating element 3 which has been pushed into place and, on the other
hand, lower hooked strips 17, 18 are pressed upwardly, again preferably by
rollers or the like, from their downwardly inclined position, into an approxi-
mately horizontal position, whereby hooks 22 on the said strips press the said
insulating element firmly against the relevant inner walls 26 of profiled metal
bars 1, 2~
As strips 6, 7 are bent from the position shown in Figure 1 into the
position shown in Figure 2, the said strips pivot about axes A, whereas hooked
strips 17, 18 pivot about axes B. Lateral boundary surfaces 15a, 25a of
edge-strips 15, 25 on insulating element 3 are caused to bear frictionally, in
the terminal position shown in Figure 2, against inner walls 26 of the profiled
_ 5 -
` ~A"
i2;~2~6S
metal bars.
As a result of the bending of strips 6, 7, insulating element 3 is
also pressed firmly onto intermediate webs 12, 13~ thus producing a positive
engagement in addition to the frictional engagement, resulting in a permanent,
immutable joint between the components of the composite section.
In place of hooked strips 17, 18, the example of embodiment accord-
ing to Figure 3 comprises webs 30 which are cold-formable, are adapted to pivot
about an axis B, and define an internal pick-up groove 28. An edge-strip 25
on insulating element 3 is inserted in the said groove. The initial position
of web 30 is shown in Figure 3 in full lines, while the terminal position is
shown in dotted lines.
The free end of web 30 comprises, on the side facing edge-strip 25,
a projecting cam-like surface 27.
The bottom 29 of pick-up groove 28 extends at right angles to inner
wall 26 of profiled metal bar 2. Even after web 30 has been bent, a gap remains
between edge-strip 25 and the bottom of the said groove.
The forces whereby edge-strips 25 and 15 are pressed against inner
walls 26 of the profiled metal bars are indicated by arrows F.
