U.S. patent number 3,906,696 [Application Number 05/435,646] was granted by the patent office on 1975-09-23 for profiled panel for the cladding of walls, ceilings, roofs and the like.
This patent grant is currently assigned to Armco GmbH. Invention is credited to Hans Poter, Christian Schroder.
United States Patent |
3,906,696 |
Poter , et al. |
September 23, 1975 |
**Please see images for:
( Certificate of Correction ) ** |
Profiled panel for the cladding of walls, ceilings, roofs and the
like
Abstract
This disclosure is directed to a panel of sheet material for the
cladding of walls, ceilings, roofs or the like in which a generally
planar main panel portion includes along transversely spaced
longitudinally extending side portions first and second
longitudinally extending ribs each of an inverted generally
U-shaped configuration as viewed in transverse cross section and
being defined by a pair of legs and a bight therebetween, each pair
of legs has at least lower leg portions which diverge away from
each other in a direction away from the main panel portion toward
their respective bight with the height of the first longitudinally
extending rib being greater than that of the height of the second
longitudinally extending rib, and the divergent relationship of
each rib being effected by at least one lower leg portion of each
pair of legs being disposed at an angle other than normal to the
main panel portion with preferably the last-mentioned lower leg
portion of each pair of legs being transversely outermost and
innermost leg portions of the respective first and second
longitudinally extending ribs. Insulating means are provided
between the first-mentioned and a second main panel portion with
the second main panel portion including a longitudinally extending
transversely projecting rib adjacent the first longitudinally
extending rib with a longitudinally extending transversely undercut
surface matching the contour of at least one surface of the
projecting rib being disposed at an opposite edge of the second
main panel portion.
Inventors: |
Poter; Hans (Voerde;
Niederrhein, DT), Schroder; Christian (Mehrhoog,
DT) |
Assignee: |
Armco GmbH (Unternehmemshereich
Armco-Eurotec, DT)
|
Family
ID: |
5895800 |
Appl.
No.: |
05/435,646 |
Filed: |
January 23, 1974 |
Foreign Application Priority Data
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|
|
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Oct 18, 1973 [DT] |
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2352309 |
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Current U.S.
Class: |
52/536;
52/592.4 |
Current CPC
Class: |
E04F
13/0876 (20130101); E04F 13/12 (20130101); E04D
3/352 (20130101); E04D 3/351 (20130101); E04D
3/358 (20130101); E04F 13/0837 (20130101) |
Current International
Class: |
E04F
13/12 (20060101); E04D 3/35 (20060101); E04D
003/35 (); E04D 003/363 () |
Field of
Search: |
;52/536,537,588,595,61B,629 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Faw, Jr. Price C.
Attorney, Agent or Firm: Diller, Brown, Ramik &
Wight
Claims
What is claimed is:
1. A panelling combination for the cladding of walls, ceilings,
roofs or the like comprising at least a pair of generally identical
panels, each panel having a generally planar main panel portion
having a pair of transversely spaced longitudinally extending side
portions, first and second longitudinally extending ribs one along
first and second ones of said longitudinally extending side
portions of each panel, each of said first and second ribs as
viewed in transverse cross section being of a generally inverted
U-shaped configuration each defined by a pair of legs and a bight
therebetween, each pair of legs having at least lower leg portions
which diverge away from each other in a direction away from their
associated main panel portion and toward their respective bight,
each of said first and second longitudinally extending ribs of each
panel being of a predetermined height as measured between their
associated bight and their associated main panel portion, the
height of each first longitudinally extending rib being greater
than the height of each second longitudinally extending rib of each
panel the divergent relationship of each rib of each panel is
effected by at least one lower leg portion of each pair of legs
being disposed at an angle other than normal to said main panel
portion, the first longitudinally extending rib of a first of said
pair of panels being in overlying snap engagement with the second
longitudinally extending rib of the second of said pair of panels,
the bights of said snap engaged ribs being substantially spaced
from each other to define a gap therebetween, at least a single
fastener having a head and a shank, said shank being passed through
an aperture of said second panel second rib bight, and said head
being housed in said gap.
2. The panelling combination as defined in claim 1 wherein in eacn
panel the bight of the rib of lower height is generally flat.
3. The panelling combination as defined in claim 1 wherein said at
least one lower leg portion of each pair of legs is a transversely
outermost lower leg portion of said first longitudinally extending
rib of each panel and a transversely innermost lower leg portion of
said second longitudinally extending rib of each panel.
4. The panelling combination as defined in claim 3 wherein upper
leg portions of said first longitudinally extending rib of each
panel are in converging relationship to each other in a direction
away from their associated main panel portion and toward the bight
of their associated first longitudinally extending rib.
5. The panelling combination as defined in claim 3 wherein upper
leg portions of said second longitudinally extending rib of each
panel are in converging relationship to each other in a direction
away from their associated main panel portion and toward the bight
of their associated second longitudinally extending rib.
6. The panelling combination as defined in claim 3 wherein upper
leg portions of said first longitudinally extending rib of each
panel are in converging relationship to each other in a direction
away from their associated main panel portion and toward the bight
of their associated first longitudinally extending rib and the
upper leg portions of said second longitudinally extending rib of
each panel are in converging relationship to each other in a
direction away from their associated main panel portion and toward
the bight of their associated second longitudinally extending
rib.
7. The panelling combination as defined in claim 3 wherein said at
least one lower leg portion of each pair of legs is a transversely
outermost free terminal lower leg portion of said first
longitudinally extending rib of each panel and a transversely
innermost nonterminal lower leg portion of said second
longitudinally extending rib of each panel.
8. The panelling combination as defined in claim 1 wherein said at
least one lower leg portion of each pair of legs is a transversely
outermost lower leg portion of said first longitudinally extending
rib of each panel and a transversely innermost lower leg portion of
said second longitudinally extending rib of each panel, and the
remaining lower leg portion of each pair of legs is generally
normal to said planar main panel portion.
9. The panelling combination as defined in claim 1 wherein said at
least one lower leg portion of each pair of legs is a transversely
outermost free terminal lower leg portion of said first
longitudinally extending rib of each panel, and a transversely
innermost nonterminal lower leg portion of said second
longitudinally extending rib of each panel.
10. The panelling combination as defined in claim 1 wherein said at
least one lower leg portion of each pair of legs is a transversely
outermost lower leg portion of said first longitudinally extending
rib of each panel and a transversely innermost lower leg portion of
said second longitudinally extending rib of each panel, and said
second rib bight of each panel is immediately joined to a
transversely outermost leg of said second longitudinally extending
rib of each panel.
11. The panelling combination as defined in claim 1 including
another generally planar main panel portion forming each panel, and
insulating means between said two main panel portions of each
panel.
12. The panelling combination as defined in claim 11 wherein said
at least one lower leg portion of each pair of legs is a
transversely outermost free terminal lower leg portion of said
first longitudinally extending rib of each panel and a transversely
innermost nonterminal lower leg portion of said second
longitudinally extending rib of each panel.
13. The panelling combination as defined in claim 1 including
another generally planar main panel portion forming each panel, and
said another planar main panel portion of each panel includes a
longitudinally extending transversely projecting rib adjacent said
first longitudinally extending rib of each panel.
14. The panelling combination as defined in claim 13 wherein said
at least one lower leg portion of each pair of legs is a
transversely outermost free terminal lower leg portion of said
first longitudinally extending rib of each panel and a transversely
innermost nonterminal lower leg portion of said second
longitudinally extending rib of each panel.
15. The panelling combination as defined in claim 1 including
another generally planar main panel portion forming each panel,
said another planar main panel portion of each panel includes a
longitudinally extending transversely projecting rib adjacent said
first longitudinally extending rib of each panel, and said another
planar main panel portion of each panel includes a longitudinally
extending transversely undercut surface matching the contour of at
least one surface of said projecting rib of each panel.
16. The panelling combination as defined in claim 1 wherein said
main panel portion of each panel includes insulating means upon an
underside thereof including within said second rib of each panel
but excluding said first rib of each panel.
17. The panelling combination as defined in claim 1 wherein said
main panel portion of each panel includes insulating means upon an
underside thereof including within said second rib of each panel
but excluding said first rib of each panel, a portion of said
insulating means transversely exteriorly of said second rib of each
panel defines a step facing toward said main panel portion of each
associated panel, and a portion of said insulating means adjacent
said first rib defines a step facing away from said main panel
portion of each associated panel.
18. The panelling combination as defined in claim 1 wherein the
bight of the rib of lower height of each panel is generally flat,
said at least one lower leg portion of each pair of legs is a
transversely outermost lower leg portion of said first
longitudinally extending rib of each panel and a transversely
innermost lower leg portion of said second longitudinally extending
rib of each panel, the remaining lower leg portion of each pair of
legs is normal to or slightly inclined relative to their associated
planar main panel portion, said at least one lower leg portion of
said first longitudinally extending rib of each panel being a free
terminal edge, said transversely innermost lower leg portion of
said longitudinally extending rib of each panel being a nonterminal
portion, said second rib bight is immediately joined to a
transversely outermost leg of said second longitudinally extending
rib of each panel, another generally planar main panel portions of
each panel, said another planar main panel portion of each panel
includes a longitudinally extending rransversely projecting rib
adjacent said first longitudinally extending rib of its associated
panel, said another planar main panel portion of each panel
includes a longitudinally extending transversely undercut surface
matching the contour of at least one surface of said projecting
rib, said insulating means being excluded from within said first
rib of each panel, a portion of said insulating means transversely
exteriorly of said second rib of each panel defines a step facing
toward its associated main panel portion, and a portion of said
insulating means adjacent said first rib of each panel defines a
step facing away from its associated main panel portion.
19. The panelling combination as defined in claim 1 wherein each
pair of legs have upper leg portions which converge away from each
other in a direction away from their associated main panel portion
and toward their respective bight, a radius portion joining each
lower leg portion to each upper leg portion, the radius portions of
said first longitudinally extending rib being in overlying snap
engagement with the radius portions of said second longitudinally
extending rib, and the height of said gap being defined by the
length of said upper leg portions of said first longitudinally
extending rib projecting beyond and away from the bight of said
second longitudinally extending rib.
Description
The present invention is directed to a panel of sheet material,
preferably constructed of metal, for the cladding of walls,
ceilings, roofs or the like which when collectively utilized are
interlocked into relationship with each other in transverse and/or
longitudinal directions.
Panels of the type to which the invention is directed are known
wherein longitudinal sides or edges are bounded by longitudinally
extending ribs of a profiled configuration as viewed in transverse
cross section. Such ribs generally include legs or flanks which are
undercut at their bases or adjacent to the main panel and more
often than not between such "profile" ribs are disposed stiffening
or reinforcing ribs which run transversely and/or longitudinally of
the main panel. The transverse profile of the longitudinally
extending ribs at the edge or sides of the panel are so constructed
that they snap together one over another. In one particular type of
such panels the panels are fixed to girders, beams, rafters or the
like through the intermediary of a rail from which are integrally
formed or into which are inserted caps with legs which spring
biasly engage within the profile ribs such that the legs in effect
biasingly engage the flanks or the legs of the profiled panel ribs.
The caps in turn may be directly secured to the rails or can be
connected directly to the understructure involved, i. e. the beam,
rafter or the like, by screws, bolts or similar fasteners.
Unfortunately, this mode of affixing a profiled panel to a
supporting structure involves a considerable outlay in terms of
material, labor, and of course expenditures of money. As an
example, the caps need first to be affixed to their associated rail
and thereafter the rails and caps are affixed to the understructure
of the building to which the profiled paneling is to be attached.
Moreover, such structure does not provide an area within which a
continuous insulating layer may be provided at an underside between
the paneling and the understructure.
In a further known conventional panel the edge ribs of two adjacent
panels are fitted directly one over another with the transverse
profile thereof being unsymmetrical as viewed in transverse cross
section. Generally a single undercut maintains two interlock ribs
in assembled condition and therefore conventional clips contoured
to the profile of the ribs are found necessary to securely fix the
panels to the understructure. At one edge of the panel which
excludes the use of clips screws are generally employed to directly
secure the panel at one of the profiled ribs to the particular
understructure involved. However, since the wall thickness of the
panel is relatively thin the head of the screw has only a weak
holding force relative to the rib and therefore does not constitute
a reliable connection.
Another common feature of known panels of this type is that the
longitudinally extending ribs which are profiled in various manners
and transverse cross-section are made of the same height as
measured between the main planar body portion of the panel and the
uppermost surfaces of the ribs resulting in difficulties not only
as in regard to the overlapping of such ribs during interconnecting
of the same, but also in securing the panels to the understructure
requiring additional affixing, holding and like securing elements
(clips).
In keeping with the foregoing, it is a primary object of this
invention to avoid disadvantages of known profiled panels of the
type heretofore described by providing a panel of sheet material
for the cladding of walls, ceilings, roofs or the like which avoids
the latter-noted disadvantages particularly by being affixed to any
supporting structure in a simple and reliable manner in the absence
of special clips or the like structure, yet provides for a
continuous layer of insulating material between the padding and the
understructure involved.
The latter-noted disadvantages of prior art structures are also
overcome by providing one rib of a height greater than another rib
such that interferences precluded, particularly when a fastening
element is used to secure the rib of lesser height to an
understructure.
A further object of this invention is to provide a novel panel of
the type heretofore described wherein the interlocking of adjacent
panels is achieved by providing at least the longitudinally
extending profiled or edge ribs with one leg portion or wall which
diverges relative to a main panel portion of the panel such that
interlocking of the ribs of adjacent panels is efficiently assured,
and the foregoing also permits the unification of adjoining or
neighboring panels by a simple turning or rotary motion which makes
assembly extremely simple and rapid.
A further object of this invention is to provide a novel panel of
the type heretofore described wherein the rib of lesser height has
a top wall or bight which is flat making it possible to use screws
having heads which are relatively large and thick which therefore
lie flat upon the flat top surface of the rib making manipulation
required for tightening and fixing the screws much easier and
utilizing but a single fastener for overall installations. Due to
such structure there is no need for auxiliary element such as
holding caps, clips or the like. However, such flattened top walls
of the ribs provide greater stability and greater elastic
properties such that the risk of the profile being crushed if
walked upon by accident during assembly is avoided. Also, from a
manufacturing standpoint such profile provides greater tolerances
and the roll-forming of such profiled panels is thus
facilitated.
Still another object of this invention is to provide a novel panel
of the type heretofore described wherein the construction permits a
layer of insulating material consisting for example of foam
plastics or the like to be integrally united with the panel by
being directly bonded thereto with the snap-engagement between the
ribs of adjacent panels constructed as aforementioned avoiding the
necessity of additional affixing means (clips) whereupon at least
one of the ribs may be totally filled with the insulating
material.
Preferably, though not necessarily, the panel included an addition
to the first-mentioned main panel portion a second panel portion
having the insulating material sandwiched therebetween with the
panel being affixed through the use of fastening means (screws)
passed through the longitudinally extending profiled rib of the
lesser height.
Yet another object of this invention is to provide a novel
sandwiched or composite panel of the type immediately aforesaid
wherein the last-mentioned or second panel portion includes a
transversely rejecting longitudinally extending rib along one of
the profiled ribs whereas an opposite end edge of the same panel
includes an angular surface contoured to the profile of at least
one surface of the transversely projecting rib whereupon the
latter-mentioned surface and ribs interengage during the assembly
of adjoining or neighboring panels.
The foregoing objectives achieve a profiled and insulated panel
which is relatively rigid thereby providing insulation which need
not be separately applied thus saving considerable time, work and
money. Additionally, such panels as heretofore described are
advantageously maintained at a readily manually, manipulatable size
not to exceed a width of approximately eighteen inches to two feet
and a length commensurate with the particular installation desired.
A profiled panel of such size not only makes handling easier but it
also makes possible the affixation of the panels with as few as
possible points of securement of the panel to a supporting or
understructure.
With the above and other objects in view that will hereinafter
appear, the nature of the invention will be more clearly understood
by reference to the following detailed description, the appended
claims and the several views illustrated in the accompanying
drawing.
IN THE DRAWINGS
FIG. 1 is a cross sectional view of a novel panel or profiled panel
constructed in accordance with this invention, and illustrates two
adjoining panels having ribs snap-engaging the same to each
other.
FIG. 2 is a diagrammatic cross sectional view similar to FIG. 1,
and illustrates a plurality of the panels each having applied
thereto a layer of insulating material with the plurality of panels
being interlockingly engaged to each other by the snap-engagement
of adjoining ribs.
FIG. 3 is a fragmentary enlarged sectional view, and illustrates
the manner in which two ribs of adjoining panels are snap-engaged
to each other.
FIG. 4 is a sectional view of another pair of panels constructed in
accordance with this invention, and illustrates the adjacent panels
being interlockingly engaged to each other by the snap-engagement
of adjoining ribs.
FIG. 5 is a transverse sectional view taken through another panel
constructed in accordance with this invention, and illustrates the
manner in which first and second main panel portions have
sandwiched therebetween insulating material with the second panel
portion having at opposite edges thereof a transversely projecting
longitudinally extending ribs and a matching undercut,
respectively.
FIG. 6 is an enlarged sectional view of a joint formed between
adjoining panels of the type illustrated in FIG. 5, and
specifically illustrates the manner in which snap-engagement is
achieved between adjoining panel ribs.
A novel panel or profiled panel constructed in accordance with this
invention is best illustrated in FIG. 1 of the drawing, and is
generally designated by the reference numeral 1. The panel 1 is
adapted for the cladding of walls, roofs, ceilings and the like and
is preferably constructed from sheet metal to define a generally
planar main panel portion 1a having a pair of transversely spaced
longitudinally extending side portions 1b, 1c. First and second
longitudinally extending ribs 2, 3, respectively, are disposed one
along the first and second ones of the longitudinally extending
side portions 1b, 1c, respectively.
Each of the first and second ribs 2, 3, respectively, as viewed in
transverse cross section is of a generally inverted U-shaped
configuration with each rib 2, 3, being defined by a pair of legs
1a, 3a, respectively, and a bight or bight portion 2b, 3b,
respectively, therebetween. The pair of legs 2a include lower leg
portions 2c, 2d which diverge away from the main panel portion 1a,
and toward the bight 2b and upper leg portions 2e, 2f which
converge toward each other in a direction away from the main panel
portion 1a, and toward the bight 2b. Between the leg portions 2f,
2d is an undercut or shoulder 2g whereas the leg portion 2c
terminates at a free terminal end or edge 2h forming a
longitudinally extending hook.
The leg 3a of the rib 3 likewise includes a pair of lower leg
portions 3c, 3d, the former of which immediately merges with a flat
planar bight portion 3b and the latter of which is joined to an
upper leg portion 3e by a shoulder 3f. The lower leg portion 3d has
a terminal edge (unnumbered) which also serves to function as an
interlock with respect to the rib 2 of an adjoining panel, as will
be described more fully hereinafter.
The bight 3b of the rib 3 has a plurality of apertures (unnumbered)
disposed along the length thereof and between the ribs 2, 3 may be
formed one or more reinforcing ribs, such as the singular
reinforcing rib 4 which is likewise of a generally inverted
U-shaped configuration as viewed in transverse cross section. The
apertures (unnumbered) of the bight 3b of the rib 3 is designed to
receive fasteners 5, such as metal or wood screws, having
relatively thick and large heads 5a.
Referring specifically to FIGS. 2 and 3 of the drawings, a
plurality of the panels 1 are shown fixed by the screws 5 to an
understructure 6 which may be, for example, one of a plurality of
beams having webs 8. The screws 5 pass only through the apertures
(unnumbered) of the ribs 3 which are, of course, of a shorter
height than the ribs 2 as measured vertically from the main panel
portion 1a of each panel 1. Thus as the ribs 2 are interlocked with
the ribs 3 by a rotary motion, as indicated by the right-handmost
rib 1 of FIG. 2 in the direction of the unnumbered headed arrow
associated therewith, an interlock is achieved between the ribs 2,
3 with a gap being provided for receipt of the relatively large
heads of the screws 5, as is best illustrated in FIG. 3 of the
drawings.
Preferably though not necessarily the panels 1 are also provided
with an insulating layer 7 of foam plastic or like material which
with each panel 1 forms an integral composite panel thereby
eliminating the separate application of insulation material in the
assembly of the panels 1 with the support structure 6. Preferably
the insulating material 7 has a planar bottom surface 7a to rest
flush upon the upper surface (unnumbered) of the webs 7 of the
beams, rafters or the like understructure 6.
Reference is specifically made to FIG. 3 which shows the rigid
interlock achieved between the ribs 2, 3 upon the rotation of the
adjoining panels to the finally snap-engaged position of the ribs.
Due to the configuration of the portions 2c, 2d, 2f, 2g and 2h of
the rib 2 and the complementary contoured portions 3c, 3d, 3e and
3f of the rib 3 an exceptionally rigid interlock engagement is
obtained between the ribs 2, 3 assuring the absence of inadvertent
and/or accidental disassembly therebetween. However, intentional
disassembly is achieved with ease simply by reversing the direction
of assembly heretofore described relative to the right-handmost
panel 1 of FIG. 2.
Again referring to FIG. 3 of the drawing, the insulating material 7
of the panels 1 is preferably also provided with longitudinally
extending steps 9, 10 adjacent the respective ribs 2, 3. The step 9
adjacent the rib 2 faces downwardly and away from the main panel
portion 1a whereas the step 10 adjacent the rib 3 faces upwardly
and toward the main panel portion 1a. The steps 9, 10
interlockingly engage each other due to the complementary contour
thereof in the manner readily apparent in FIG. 3 upon, of course,
the relative rotational interlocking action being imparted to one
of the panels during the assembly thereof in the manner heretofore
described relative to the right-handmost panel 1 of FIG. 2.
Preferably, though not necessarily, the underside of the insulation
7 as well as the faces and adjoining portion of the steps 9, 10 are
provided with a covering of relatively impermeable material to
assure that the insulation will not be adversely affected by the
moisture, dirt and the like. Additionally, the panels of FIG. 2 may
also be advantageously laid in offset relationship to one another
in their longitudinal direction so that in each case there is a
minimum of material overlap thickness at each of the overlap
regions, namely, a maximum of three thicknesses of sheet material
at adjoining longitudinal joints.
Another panel constructed in accordance with this invention is
illustrated in FIGS. 4 through 6 of the drawings and once again is
designed particularly for the cladding of walls, ceilings, roofs
and the like. As in the case of the panel 1 the panel 11 is
constructed from sheet material and includes longitudinally
extending ribs 12, 13 having respective legs 12a, 12b and 13a, 13b.
The legs 12a, 13a correspond identically in structure to the leg
portions 2e, 2c and 2h of the panel 1 whereas the leg 13a
corresponds identically to the leg portion 3c of the leg 3a of the
panel 1.
The legs 12 and 13 also include bight portions 12c, 13c which
receive fasteners 21. What was, one or more reinforcing ribs 13 may
be disposed between the ribs 12, 13, as in the case of the
reinforcing rib 4 of the panel 1. However, as opposed to the panel
1 the legs 12b, 13b of the ribs 12, 13 do not include a shoulder
corresponding to the shoulder 3f of the ribs 3 but instead include
generally normal or vertical leg portions 12d, 13b, the latter of
which merges directly with the bight 13c whereas the former is
joined by an upper leg portion 12e to the bight 12c. Thus the
portions 12d, 13b are devoid of undercutting and are simply
straight or very slightly curved. It should be particularly noted
that the lower leg portion 12d is transversely innermost relative
to the rib 12 whereas the leg or flank 13b is transversely
outermost of the rib 13. Due to this construction inner engagement
between the ribs 12, 13 of adjacent panels is readily effected by a
turning or rotary movement about a centerpoint 15 (FIG. 4) of the
portion 13a of the rib 13, as is most readily apparent by
visualizing the right-handmost panel 11 of FIG. 4b in the position
of the right-handmost panel 1 of FIG. 2 and then being rotated
clockwise to the fully seated position illustrated in FIG. 4.
Preferably, though not necessarily, the panel 11 may also be
provided as a composite structure to the underside of which may be
secured a layer of insulating material 16. The lower surface of the
insulating layer 16 may also be provided with another panel or
panel portion of sheet metal 17 and in any event the insulating
material 16 and/or the additional panel 17 is provided with a
transversely directed longitudinally extending projection 18
adjacent the rib 12 having surfaces 18a, 18b converging in a
direction transversely outboard of the overall panel 11. At an
opposite longitudinal edge of the panel 11 adjacent the rib 13 the
panel 17 has an longitudinally extending surface 20 contoured to
the general configuration of the surface 18a of the transversely
projecting longitudinally extending rib 18. Thus upon assembly of
two of the components of panels 11 of FIG. 5 one to the other, in
the manner illustrated in FIG. 6, smooth engagement is achieved
between the surface 18a of the projection 18 and the undersurface
20 adjacent the rib 13. In order to achieve a vapor seal (where
found necessary or desirable) between the panels sealing strips 22,
23 (FIG. 6) may be disposed along the longitudinal lengths of these
innerconnections, although such is not a prerequisite for the
operation of the invention.
While preferred forms and arrangements of parts have been shown in
illustrating the invention, it is to be clearly understood that
various changes in details and arrangement of parts may be made
without departing from the spirit and scope of this invention.
* * * * *