U.S. patent number 3,703,063 [Application Number 05/030,832] was granted by the patent office on 1972-11-21 for profile member for windows, doors, facades, or the like.
This patent grant is currently assigned to Dynamit Nobel Aktiengesellschaft. Invention is credited to Walter Andree, Wolfgang Budich, Hans Schaefer, Hans Theissen.
United States Patent |
3,703,063 |
Budich , et al. |
November 21, 1972 |
PROFILE MEMBER FOR WINDOWS, DOORS, FACADES, OR THE LIKE
Abstract
A profile member for windows, doors or the like formed by a
hollow closed metal section having a shell of synthetic material
providing one or more projections including a glaze projection for
accomodating a glass pane, a connecting projection which
facilitates connection of the member to a structural building part,
and an abutment projection for effecting contact producing closure
with another profile member.
Inventors: |
Budich; Wolfgang (Sieglar,
DT), Theissen; Hans (Eschmar, DT),
Schaefer; Hans (Cologne-Nippes, DT), Andree;
Walter (Troisdorf, DT) |
Assignee: |
Dynamit Nobel
Aktiengesellschaft (Troisdorf, DT)
|
Family
ID: |
5731851 |
Appl.
No.: |
05/030,832 |
Filed: |
April 22, 1970 |
Foreign Application Priority Data
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Apr 22, 1969 [DT] |
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P 19 20 248.3 |
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Current U.S.
Class: |
52/213; 49/504;
52/204.1 |
Current CPC
Class: |
E06B
3/5821 (20130101); E06B 3/222 (20130101); E06B
3/60 (20130101); E06B 3/362 (20130101) |
Current International
Class: |
E06B
3/04 (20060101); E06B 3/58 (20060101); E06B
3/22 (20060101); E06B 3/60 (20060101); E06B
3/36 (20060101); E06B 3/32 (20060101); E04c
003/30 () |
Field of
Search: |
;52/727,728,309,400,515,204 ;49/DIG.1,DIG.2,504,489,488,484 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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1,259,491 |
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1961 |
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FR |
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1,279,752 |
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1961 |
|
FR |
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116,214 |
|
1969 |
|
NO |
|
Primary Examiner: Sutherland; Henry C.
Claims
We claim:
1. A casement member for supporting windows, doors, facades, or the
like on a fixed structure, comprising a hollow metal longitudinal
member of generally rectangular cross section, an uninterrupted
shell of synthetic plastic material covering said metal member,
anchoring means for securing said metal member to said fixed
structure in the form of a connecting projection having first and
second legs extending as part of said shell from said metal member
in parallel relation and having transverse end portions directed
toward each other, said connecting projection occupying only a
portion of one side of said longitudinal member, and an abutment
projection extending as part of said shell from a side of said
metal member opposite said connecting projection and having an
undercut groove formed therein on one side adjacent to the end
thereof and an additional groove in said shell adjacent to said
abutment projection, said abutment projection and said connecting
projection each having one surface in alignment with a side of said
metal member.
2. A structural member as defined in claim 1 wherein said
connecting projection further includes additional transverse
portions extending from said first and second legs toward each
other intermediate said end portions and said metal member.
3. A structural member as defined in claim 1 wherein said abutment
projection includes a transverse end portion directed toward said
additional groove.
4. A structural member as defined in claim 1 wherein at least two
spaced connecting projections are provided by said shell extending
in alignment on the same side of said member.
5. A structural member as defined in claim 1 wherein a web extends
between said first and second legs intermediate the end portions
and said metal member.
6. A sash assembly for use in forming a sash for movably supporting
windows, doors, facades or the like, comprising a hollow metal
longitudinal member of generally rectangular cross section, an
uninterrupted shell of synthetic plastic material covering said
metal member, a glaze projection extending as part of said shell
from said metal member and having a side surface portion which is
saw-tooth shaped, an abutment projection extending from said shell
and having an undercut groove formed therein on one side adjacent
the end thereof, said abutment projection and said glaze projection
each having one surface in alignment with a side of said metal
member, and a bipartite support arrangement including one
substantially U-shaped part removably secured to said metal member
at a desired spacing from said glaze projection and a second part
secured to said one part by snap connection by means of two
outwardly directed lugs, said second part including a support
member extending into contact with said shell.
7. A structural member as defined in claim 6 wherein said saw-tooth
shaped surface portion is provided by a plurality of
non-symmetrical teeth.
8. A structural member as defined in claim 6 wherein said abutment
projection includes a transverse end portion directed toward said
additional groove.
Description
This invention relates to a profile member for windows, doors,
facades, or the like, with a hollow metal section and a shell of a
synthetic material surrounding this metal section, which shell has
one or more fillet-shaped projections.
Such profile members wherein the hollow metal section forms a
supporting core and the plastic shell of, for example, soft PVC,
ensures that the profile members are resistant to corrosion and are
heat-insulated, are known in a great variety of designs (German
Utility Model No. 1,720,617, British Pat. No. 989,304). However,
all of these systems have the disadvantage in common that the
number of basic profiles required is relatively large, and that,
moreover, numerous auxiliary profiles are necessary for combining
these basic profiles into a flawless, tight connection to the
structural component; these auxiliary profiles do not only render
the manufacture and storage of the profile members difficult, but
also the assembly thereof correspondingly is complicated, and thus
uneconomical. Another factor which makes such designs expensive is
also that the conventional systems, due to their profile
configuration and the chamber size resulting therefrom, require
fittings which must be specially manufactured for this purpose.
Additionally, the elastic sealing lips of soft PVC attached by
extrusion, which are customary in these systems for internal and
external sealing, become brittle in the course of time, so that,
especially in the case of larger window sashes having larger
sagging effects, the flawless seal against wind and water is not
ensured any more, under unfavorable conditions. The only
alternative is to replace the sealing lips subsequently with those
of another elastic material, by means of expensive repair work.
The invention is based on the problem of eliminating the
above-mentioned disadvantages of the known profile members. In
accordance with the invention, this problem is solved by
providing
A. A GLAZE PROJECTION WITH A CONTOUR WHICH IS SAWTOOTH-SHAPED-- AS
SEEN IN CROSS SECTION-- ON THE SIDE FACING A POSSIBLE GLAZING;
AND/OR
B. A CONNECTING PROJECTION WITH LEGS PREFERABLY ORIENTED IN
PARALLEL WITH RESPECT TO EACH OTHER, WHICH LEGS EXHIBIT, ON THEIR
FREE ENDS, FILLET-SHAPED THICKENED PORTIONS WHICH ARE DIRECTED
TOWARD EACH OTHER; AND/OR
C. AN ABUTMENT PROJECTION WITH AN UNDERCUT GROOVE FORMED ON THE
SIDE FACING A POSSIBLE COUNTER PROFILE MEMBER AND EXTENDING IN THE
DIRECTION OF THE LONGITUDINAL AXIS OF THE PROFILE MEMBER, AS WELL
AS A GROOVE FORMED IN THE SAME OR IN A SIMILAR MANNER ON THE SIDE
OF THE PLASTIC SHALL FACING THE POSSIBLE COUNTER PROFILE MEMBER,
OPTIONALLY IN THE ZONE OF A FILLET-SHAPED REINFORCEMENT.
By the above features, the objective is attained that the profile
member, in order to reduce the number of basic and auxiliary
profile members, can be utilized in as versatile a fashion as
possible and that, on the other hand, a flawless seal is ensured
with certainty with respect to the structural component, the
glazing, and between the frame and sash of a window or of a door,
even under very unfavorable conditions.
Depending on the special purposes for which the profile members are
employed, it is possible to vary the number and type of the
projections formed at the profile member in a variety of ways,
i.e., it is possible, in addition to providing only one, or all
three, of the above-mentioned projections, to form the profile
member, for example, also with two glaze projections disposed on
different sides of the plastic shell, or also with three connecting
projections. Of course, the projections can be manufactured either
integrally with the plastic shell, or also independently thereof,
in which latter case they are joined to the shell subsequently, for
example, by cementing or welding. However, in view of the objective
to render the assembly as simple as possible and obtain as high a
strength as possible with small cross-sectional dimensions, an
integral manufacture is preferably contemplated, especially since
the manufacturing effort required for this purpose is relatively
small, in view of the low number of required basic profiles.
In a suitable embodiment of the invention, it is furthermore
suggested to fashion the glaze projection in a conventional manner
as a bipartite profile section, one part of which is mounted to the
profile member by screws, by cementing, or the like, and exhibits a
hollow cross section which is accessible from the outside and
widens toward the inside. The other part can be inserted into this
hollow section by means of two outwardly directed and
correspondingly dimensioned, fillet-shaped lugs, in the manner of a
snap connection. Furthermore, it is suggested to form this other
part so that it rests, on its side facing away from the glazing, on
the part directly mounted to the profile member and/or on the
profile member itself, optionally by means of an additional spacer
strip.
The advantage connected therewith resides in that the other part,
also called the glass molding, due to the fact that the spacing
between the snap connection and the supporting site is selected to
be as large as possible, is safely prevented from executing even
minor tilting motions directed away from the glass; consequently,
any detachment of the putty is reliably prevented. A further
advantage attained in case of an external glazing of a window,
i.e., wherein the glass strip is on the outside and thus can be
exposed to quite an intense heat radiation in certain cases,
resides in the fact that the snap connection proper is shielded
from heat radiation by the spacer strip disposed in front thereof.
As a consequence, any undue heating of the synthetic material in
the zone of the snap connection, which could in certain cases
entail a detachment of the snap connection due to the thermal
expansion connected therewith, is avoided with certainty.
In accordance with another suggestion of the invention, the
provision is made cementing provide the two legs of the connecting
projection, on each of their sides facing each other, with an
additional fillet-shaped thickened portion facing the other portion
on the other leg. This is for the purpose of making it possible to
hold auxiliary profile members inserted between the two additional
thickened portions, securely by cementing or by means of screws. In
accordance with the invention, it is also possible, instead, to
connect the two legs of the connecting projection by means of a
web, so that either the auxiliary profile members are securely
held, in the manner of a snap connection, between this web and the
fillet-shaped thickened portions formed on the free ends of the
legs, or a slot of an appropriate width is milled subsequently into
the web, which slot makes it possible to mount the auxiliary
profile members by cementing or by a threaded connection.
It is an object of the present invention to provide profile members
for windows, doors, facades and the like which avoids the
disadvantages inherent in known structures of the prior art.
It is another object of the present invention to provide profile
members of the type described having a generally more universally
adaptable configuration.
It is a further object of the present invention to provide profile
members which require a minimum number of auxiliary profiles,
thereby facilitating storage and assembly.
It is still another object of the present invention to provide
profile members which are of simple configuration and therefore
easily and economically manufactured.
It is a still further object of the present invention to provide
profile members having a configuration which is capable of use, for
the most with, standard fittings.
These and other objects features and advantages of the present
invention will become more apparent from the following detailed
description thereof, when taken with the accompanying drawings,
which illustrate several embodiments of the present invention, and
wherein:
FIG. 1 is a cross-sectional view of the frame in accordance with
the present invention;
FIG. 2 is a cross-sectional view of the sash in accordance with the
present invention;
FIG. 3 shows a sectional view of the frame attached to a wall, and
a sash with glazing in cooperation with the frame;
FIG. 4 is a sectional view of the frame with a window sill
connection and a sash in cooperation with the frame;
FIG. 5 is a sectional view of a combination of two basic profile
members;
FIG. 6 is a sectional view of a somewhat different combination of
two basic profile members;
FIG. 7 is a sectional view of a frame and a sash with an interposed
auxiliary profile member; and
FIG. 8 is a sectional view of a combination of two sash members
with an auxiliary profile member and glazing.
In the various views of the drawings like reference numerals have
been used to designate corresponding elements wherever
possible.
The blind frame profile member 1, shown in FIG. 1, has a
rectangular hollow core 2 of, for example, steel or aluminum,
surrounded by the shell 3 of a synthetic material, for example soft
PVC. Of course, depending on the requirements, it is also possible
to employ a hollow core 2 of a different cross section, i.e., for
example, a square, round, or also oval core. On one longitudinal
side of the plastic shell 3, the two connecting projections 4 are
formed, the legs 5 and 6 of which are, in this instance, parallel
to each other, but which can, basically, also be disposed so that
they are inclined with respect to each other. On their free ends,
the legs exhibit the fillet-shaped thickened portions 7 and 8,
facing each other, with a gap being left, so that the groove 10 is
formed in conjunction with the web 9 extending at a spacing from
these thickened portions and connecting the two legs 5 and 6 with
each other; this groove has a T-shaped cross section.
The leg 5 of the connecting projection 4 continues without
interruption into the surface 11 of the plastic shell 3, in order
to obtain a profile member having as smooth a surface as possible.
However, it is, of course, also possible to deviate from this
design; in other words, the projection could be arranged so that it
projects beyond this surface 11, or is recessed with respect
thereto, if this should be advantageous. The length of the legs 5
and 6 is dimensioned so that there is sufficient space for the
provision of commercially available fittings.
On the side of the plastic shell 3 opposite to the connecting
projections 4, the abutment projection 12 is arranged, which latter
likewise continues without interruption into the surface 11, like
the connecting projections 4; however, here again, it is possible
to deviate from this design. On the side facing away from the
surface 11, the abutment projection 12 has, at its free end, the
fillet-shaped extension 13 serving as the stop member for any
counter profile which may be provided. Furthermore, on the same
side, the groove 14 is formed, which is undercut and extends in the
longitudinal direction of the profile member. The cross section of
this groove can be, for example, T-shaped or dovetail-shaped, and
this groove serves for the insertion of a separately manufactured
elastic seal, which latter rests against the counter profile
member, together with the extension 13.
On the side of the plastic shell 3 facing the extension 13, the
fillet-shaped thickened portion 15 is formed, provided with the
undercut groove 16 extending in the longitudinal direction of the
profile member. The shape and dimensions of this groove 16 are
adapted to the separately manufactured, elastic central seal which
is held therein. The reinforcement or thickened portion 15 can be
omitted, if the plastic shell 3 is initially made with such a thick
wall that the groove 16 can be formed therein without any
difficulties. Finally, on the same side of the plastic shell 3, the
fillet-shaped projection 17 is provided serving as the contact
surface for the seal of the counter profile member.
The sash profile member 18, shown in FIG. 2, likewise exhibits a
supporting hollow metal core 2 and a shell 3 of a synthetic
material, which shell is provided, on one longitudinal side
thereof, with the abutment projection 12, the groove 16 formed in
the reinforced member 15, and the projection 17. Diagonally
opposite to the abutment projection 12, the glazing projection 19
is arranged, which latter continues, just as the other projections,
without interruption into the surface 11 of the plastic shell 3,
but which can just as well be provided offset with respect to this
surface. In the same manner, it is also possible to arrange the
glazing projection 19 on the other edge of the same side of the
plastic shell 3. On the side facing away from the surface 11, the
glazing projection 19 is provided with the sawtooth-shaped contour
20-- as seen in cross section-- advantageously ensuring a
satisfactory and secure form-fitting connection not only with the
putty of the glazing, but optionally also with the permanently
elastic sealing mass covering the same. In this connection, the
flanks of the individual teeth of the contour portion 20 have
differing inclinations, the flanks facing the free end of the
glazing projection 19 being more inclined than the flanks facing
away therefrom, so that on the basis of this barb effect a further
improvement of the form-fitting connection with the putty and the
sealing mass is obtained.
According to FIG. 3, the blind frame profile member 1 is attached
to the wall 21 of the structural component by means of the doubly
bent flat irons 22 disposed at an appropriate spacing from each
other. It is also possible, in place thereof, depending on the
requirements, to effect the mounting, for example, by means of
appropriately dimensioned screws penetrating the blind frame
profile member 1 from the side facing away from the wall 21 and
held in the wall 21 by dowels or plugs. In order to be able to make
a simple adaptation to varying distances between the wall 21 and
the window or door soffit 23, when using angled flat irons 22, the
provision can moreover be made that the web 24 of the flat irons 22
is adjustable in its length.
The flawless connection of the blind frame profile member 1 to the
plaster layer 25 applied to the inside of the wall 21 is achieved
by means of the L-shaped plaster connection profile member 26,
which latter is made of metal or also of a synthetic material. One
leg of this L-shaped connection profile member is dimensioned in
its length and width so that the profile member 26 can reliably be
mounted, with the aid of the lug-type projections formed on this
leg, in the groove 10 of the connecting projection 4 adjoining the
plaster layer 25, in the manner of a snap connection. The other leg
of the profile member 26 disposed in the plaster layer 25 and
extending beyond the connecting projection 4 makes it possible to
provide a clean, uninterrupted continuance into the plaster layer
25 by removing any excessively used plaster by moving the trowel
upwardly along the plaster connection profile member 26.
The gap present on the outside between the wall forming the window
or door soffit 23 and the blind frame profile member 1 is reliably
closed by the permanently elastic seal 27.
The sash profile member 18 rests against the blind frame profile
member 1 and is movable relatively thereto; this sash profile
member is, if possible, adapted in its dimensions to the blind
frame profile member 1 in such a manner that both abutment
projections 12 come in contact with the respective counter profile
member. The seal between the two profile members is effected by
means of the two central seals 28 manufactured separately from an
elastic, for example neoprene-type, synthetic material, which seals
are inserted in the grooves 16. The grooves 16 of the two profile
members are relatively positioned in such a manner that the central
seals 28 contact each other in a flawless sealing fashion, so that
a reliable seal is safely ensured even under unfavorable
conditions, such as in case of relatively major sagging of the sash
frame.
In order to still obtain a satisfactory seal even under especially
unfavorable conditions, as they can prevail, under certain
circumstances, in the upper floors of high-rise buildings in case
of large windows and high wind pressures, the provision can
moreover be made in an advantageous manner to combine the twin
central seals 28 with an additional elastic internal and/or
external seal made of the same or also of a different material as
the central seal 28; this is done by inserting an inner elastic
seal 29 in the groove 14 of the sash profile member 18 and/or an
outer elastic seal 30 in the groove 14 of the blind frame profile
member 1. The arrangement of these seals extending around the
window or the door is, of course, designed such that the seal is
not interrupted at any point by the fittings, which latter are not
shown.
On the side of the sash profile member 18 facing away from the
blind frame profile member 1, the twin glass pane 31, 32 is
disposed between the glaze projection 19 and the glass molding 34
with glass molding support profile member 33; instead of the twin
glass pane, it is also possible to choose, in case of lower
requirements with respect to heat insulation, freedom of fittings,
etc., a simple single glass pane. The glass molding support profile
member 33, made of metal or a synthetic material, is connected with
the sash profile member 18 in a conventional manner by cementing,
by screws, or the like, and serves, in a manner which is likewise
known per se, for holding the glass molding 34, which latter is
likewise made of metal or a synthetic material and is insertable in
the manner of a snap connection. For this purpose, the two legs of
the glass molding support profile member 33, which latter exhibits
a substantially U-shaped cross section, are angled at their free
ends with respect to each other in such a manner that the
correspondingly dimensioned glass molding 34, with the two
laterally disposed, outwardly pointing, fillet-shaped lugs, is
pressed into the glass molding support profile member 33 and can be
connected, in a form-fitting manner, with this member 33, under
elastic deformation of one member, or also both members. The glass
molding 34 extends, on the side facing away from the glass panes
31, 32, beyond the glass molding support profile member 33 and
rests, with the spacer strip 35 formed thereat, on the sash profile
member 18, whereby an additional fixation of the glass molding 35
is advantageously obtained, on the one hand, and a protection of
the snap connection against heat radiation is achieved, on the
other hand.
The glass panes 31, 32, held apart by means of the molding 36,
likewise made of a synthetic material or of metal, are mounted in
the sash frame at several places along their periphery by means of
the square- and/or wedge-shaped parts 37, 38, forming the so-called
padding members. The glazing 31, 32 is sealed by means of the putty
39 which is securely held in an advantageous manner by the
sawtooth-shaped contour 20 of the glaze projection 19, and by the
conventional scoring of the glass molding 34. On the side exposed
to atmospheric influences, the putty 39 is provided with the
durable cover 40, which latter is likewise securely held by the
sawtooth-shaped contour 20.
In the window sill connection of the blind frame profile member 1
shown in FIG. 4, the outer window sill 41, exhibiting a
substantially L-shaped cross section and being made, for example,
of aluminum sheet or zinc plate, or also of a synthetic material,
is held in the connecting projection 4 between the additional
fillet-shaped thickened portions or, if the connecting projection 4
was, instead, fashioned with a web 9, in the subsequently milled,
correspondingly wide slot of the web 9, by means of the screws 42.
The window sill 41 rests, with its other leg, on the structural
support or building part by way of the sealing intermediate layer
43. The blind frame profile 1 rests on the inner window sill 44
with the other connecting projection 4, which latter is, for the
purpose of obtaining a draft-free connection between the window and
the structural component, provided subsequently, in a simple
manner, with a cutout which allows it to extend around the inner
window sill 44 from two sides.
Of course, it is possible to effect numerous other flawless, clean,
and tight connections between the structural component and the
blind frame profile, by means of the connecting projection 4 of
this invention, so that an optimum adaptation to the requirements
of each individual case is provided. Likewise, it is, of course,
left up to discretion, in case there is no profile member available
with a connecting projection 4, to employ instead a profile member
having an abutment projection 12 or a glaze projection 19 for the
blind frame, and to connect the same to the structural component in
a conventional manner.
The combination of two blind frame profile members 1 shown in FIG.
5 serves, for example, as a stationary subdivision for a window, or
also for two adjacently disposed doors. The two blind frame profile
members 1 are connected with each other by means of screws, not
shown, with the interposition of a projection-less, rectangular
basic profile member 45 exhibiting a supporting metal core 2 and a
plastic shell 3. In this connection, it is advantageously possible
to connect the connecting projections 4 of the two blind frame
profile members 1 with each other by means of the insert strip 46,
the latter being dimensioned so that it is securely held by
frictional contact between the thickened portions 7 and 8 of the
connecting projections 4. If necessary, any manufacturing
tolerances which may be present can be compensated for, by
inserting the insert strips 46 to a greater or lesser extent into
the groove 10 of the connecting projections 4. The material as well
as the color or surface of the insert strips 46 can be selected in
dependence on the requirements of each individual case, for example
to produce special optical effects.
In FIG. 6, a somewhat different combination of two basic profile
members 47 is illustrated, which can be installed, for example, as
a fixed subdivision in a facade facing with an intermediate wall or
partition extending vertically therefrom. The two basic profile
members 47 exhibit on the side on which they face each other,
respectively, one connecting projection 4, and are connected with
each other by means of screws, not shown, by the interposition of
the rectangular basic profile member 45. Contrary to the embodiment
of FIG. 5, the basic profile member 45 is disposed so that it is
rotated by 90.degree., so that it projects beyond the basic profile
members 47 and can be connected to an intermediate wall, not shown.
In order to compensate for the fillet-shaped projection 17 formed
at the basic profile members 47, the separately manufactured spacer
strips 48 of metal or plastic are provided. The connecting
projections 4 of the two basic profile members 47 are connected
with each other by the insert strip 46, as in FIG. 5. On the sides
facing away from each other, the basic profile members 47 exhibit
the glaze projections 19.
In FIG. 7, the basic profile members 47 are not rigidly connected
with each other; rather, both are disposed so that they are movable
relatively to each other. The auxiliary profile member 49,
preferably made of hard PVC, is cemented or screwed to the one
basic profile member 47 and serves as a stop for the other basic
profile member 47. The sealing effect is attained by means of the
inner seal 29 and the outer seal 50. The outer seal 50 is formed
with a crescent-shaped cross section and sealingly contacts with
its rims the two connecting projections 4. The space formed between
the connecting projections 4, together with the grooves 10, act
advantageously as a turbulence chamber for wind and rain, so that
the outer seal 50 is thus stressed to a reduced extent. Such an
arrangement of the profile members can be employed, for example,
for a casement window or also a two-wing window without fixed
subdivision.
For the same purpose, the arrangement can be employed which is
shown in FIG. 8, wherein two basic profile members 52 are combined;
these members differ from the basic profile members 47 only in that
the legs 5 and 6 of the connecting projections 4 are shortened to
the length of the projection 17. In conjunction with the auxiliary
profile members 52 and 53, preferably made of soft PVC and attached
by cementing, which members differ only by the length of one of
their legs and serve as an abutment for the respective counter
profile member, it is possible in this manner to realize a very
small distance between the basic profile members 51, which latter
are movable relatively to each other. The sealing effect is
achieved by means of elastic seals, not shown, which are installed
in undercut grooves 54 of the auxiliary profile members 52 and
53.
The illustrated profile members and profile combinations are, of
course, only to be considered as examples. Thus, it is possible,
for example, by means of additional auxiliary profile members, or
also by means of either cutting off the profile projections of this
invention, or by providing cutouts in these projections, to realize
numerous other modifications, so that all requirements occurring in
practice can be satisfied in an optimum fashion.
Although the present invention has been described with reference to
but a single embodiment, it is to be understood that the scope of
the invention is not limited to the specific details thereof, but
is susceptible of numerous changes and modifications as would be
apparent to one with normal skill in the pertinent technology.
* * * * *