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Патент USA US3053371

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Sept. 11, 1962
J. E. STANLEY
3,053,359
DEMOUNTABLE ACOUSTICAL CEILING
Filed March 21, 1960
2 Sheets-Sheet 1
Sept. 11, 1962
'
J. E. STANLEY
3,053,359
DEMOUNTABLE ACOUSTICAL CEILING
Filed March 21. 1960
2 Sheets-Sheet 2
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Patented Sept. 11, 1962
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the spacing of the primary support members ‘does not
3,053,359
DEMOUNTABLE ACOUSTICAL CEILING
John E. Stanley, Flintridge, Cali?, assignor to Duo-Flex
Corporation, Glendale, Cali?, a corporation
Filed Mar. 21, 1960, Ser. No. 16,299
8 Claims. (Cl. 189-85)
depend on the ski-ll of the workers who install a ceiling.
The transverse spacers are connected directly to hangers
that, in turn, are directly connected to the primary sup
port members to suspend the primary support members
from overhead building structure. In such an arrange
ment, the transverse members ‘are ‘only indirectly con
This invention relates to acoustical ceilings of the type
in which acoustical tiles are carried by a metal grid that
nected to the primary support members but nevertheless
includes primary support members of channel-shaped
connected.
An important feature of this last practice of the inven
tion is that the hangers are made in separable parts, each
cross section.
One problem to which the invention is directed is to
provide a ceiling surface that is composed entirely of
acoustical tiles with no exposed portions whatsoever of
serve their purpose as effectively as if they were directly
comprising a metal bar and two brackets that are re
movably mounted on the opposite ends of the bar. The
the metal support structure. Such a ceiling has a de 15 two brackets are adapted for ‘direct connection with
the ends of corresponding transverse spacers. As will be
sirably uniform appearance and, of course, such a ceiling
explained, this construction makes the installation pro
cedure ?exible since the hangers may be assembled in
Another problem is to provide such a ceiling that is of
advance or may be assembled in the course of the in
economical construction. The ceiling should be con
structed for accurate installation Without requiring highly 20 stallation procedure.
When the acoustical ceiling is installed in an o?ice
specialized skill.
building the primary support members are aligned with
A third problem which is important in some installa
the window mullions. To install a wall partition in line
tions is to achieve vertical compactness in such a ceiling
with any selected window mullion, it is merely necessary
by installing the ceiling tiles at a level close to the level
of the channel-shaped primary support members. This 25 to drill small holes through the acoustical tile and through
the sheet metal of the selected primary support member
problem is easily met by exposing the primary support
to receive metal screws for anchoring the structure of the
members as parts of the ceiling surface. The di?iculties
partitions. If at any time in the future it is decided to
arise in attempts to conceal the primary support members.
remove the wall partitions, it is a simple matter to do so.
A fourth problem is to provide an acoustical ceiling
provides maximum acoustical absorption.
which makes it possible to install or remove wall parti
tions without disturbing the acoustical ceiling. It is con
templated that in the construction of a large building the
30 The sheet metal screws are removed and the small holes
vacated by the sheet metal screws are not noticeable since
they appear to be part of the original pattern of recesses
in the acoustical ceiling.
The various features and advantages of the invention
port members aligned with all of the Window mullions
so that wall partitions may be installed quickly and in 35 will be apparent from the following description together
with the accompanying drawings.
expensively in line with any selected mullions. Thus the
In the drawings, which are to be regarded as merely
invention achieves economies in making it possible to
illustrative :
completely install a ceiling of large area before decisions
FIG. 1 is a vertical section through a ceiling embodying
are reached as to how the ?oor space is to be divided
into rooms. It is further ‘contemplated that a wall parti 40 a selected practice of the invention, the view including a
cross section of a primary support member;
tion may be removed quickly and inexpensively whenever
FIG. 2 is a perspective view looking down on the in
desired without the necessity of doing anything whatso—
stalled ceiling from above;
ever to restore the acoustical ceiling.
FIG. 3 is an exploded View showing how a hanger may
The invention meets these problems, in part, by using
acoustical ceiling will provide concealed primary sup
relatively wide channel-shaped primary support members 45 be assembled and engaged with a primary support mem
with rows of acoustical tiles mounted directly on the
undersides of the primary support members. Thus the
ceiling surface is provided by parallel rows of tiles mount
ed on the undersides of the parallel primary support
ber.
FIG. 4 is an enlarged fragmentary section taken as
indicated ‘by the line 4——4 of FIG. 2, the view showing
how a secondary support member in the form of an in
members and alternate parallel rows of tiles in the spaces
verted T-spline engages kcrfs in the adjacent edges of
between the primary support members.
ceiling tiles;
The alternate
rows of tiles are carried by secondary support members
which in turn are carried by the primary support mem
bers.
:In one practice of the invention, the tiles that are
mounted on the undersides of the channel-shaped primary
support members are simply adhesively bonded to the
support members. A feature of a second practice of the
FIG. 5 is a view similar to FIG. 1 showing a ceiling
embodying a second practice of the invention;
FIG. 6 is a fragmentary perspective view of a primary
support member and an associated pair of longitudinal
members that engage longitudinal shoulders of the pri
mary support members in this second embodiment, the
longitudinal support members being shown elevated from
their assembled positions;
invention, however, is the concept of constructing the
channel-shaped primary support members for sliding sup— 60
FIG. 7 is a fragmentary plan view of the same ceiling
porting engagement of the tiles. For this purpose, the
structure on a reduced scale; and
FIG. 8 is a fragmentary perspective view indicating
how the primary support member shown in FIGS. 5 and
6 may be fabricated by assembling separate pieces in
their edges and the primary support member is formed
stead of being in the form of an extruded member.
with ?anges to engage the kerfs.
The principal parts of the assembled ceiling structure
In one practice of the invention, the primary support
members are interconnected by elongated transverse mem
shown in FIGS. 1 and 2 include: spaced parallel rows
of acoustical tiles l0; alternate parallel rows of wider
bers. Since the transverse members interconnect the
tiles 11, each of which has a kerf 12 in each of its four
primary support members, they cooperate therewith to
form a uni?ed grid, and since they serve as spacers, they 70 edges in a well-known manner; a plurality of parallel
primary support member or panels 14 of the same width
may be accurately dimensioned to predetermine the spac
as the titles 10; a plurality of wires 15 for suspending
ing of the primary support members. Thus the accuracy of
tiles that are to be mounted in a row in the underside of
a primary support member are provided with kerfs in
3,053,359
3
4
the primary support members 14 from ?xed over-head
building ‘structure; a corresponding plurality of hangers
along its bottom edge, which ?anges extend into the kerfs
16 which are attached to the lower ends of the wires 15
in engagement with the primary support members 14;
a plurality of elongated members 18 in the form of angles
that span the spaces between the primary support mem
bers 14 and are connected at their opposite ends to the
hangers 16; a plurality of secondary support members in
the form of inverted T-splines 20 (FIG. 4) that are sup
12 of adjacent tiles 11.
As may be seen in FIG. 4, each of the inverted T
splines 20 may be made in two sections, namely a section
20a which forms the ?ange 64 and a section 20b which
forms the ?ange 65. The two sections 200 and 20b nest
together with a top ?ange 66 of the section 20b resting
on a top ?ange 68 of the section 20a._ It is apparent that
the section 20!) may be readily lifted away from the
ported at their opposite ends by the primary support 10 section 20a but normally ?ts tightly against the section
members 14 and, in turn, engage kerfs of the tiles 11 to
support the tiles; and a plurality of ?at splines 22 which
also extend into the kerfs of the tiles 11 along the edges
of the primary support members in the spaces between
the successive T-splines 20.
Each of the primary support members 14 may be of
the general con?guration of a U-shaped channel with a
pair of upwardly extending side webs 25 and with a
2% in a manner that precludes air ?ow between the two
sections. Thus the two sections nest together to form an
air seal at the juncture of the two adjacent tiles 11.
The manner in which this first embodiment of the in
vention serves its purpose may be readily understood from
the foregoing description. In a typical procedure for
installing the ceiling, the primary support members 14
bottom web 26. Each of the channel-shaped primary
support members 14 is also formed with laterally extend
ing longitudinal side ?anges 28 at its opposite lower lon~
are ?rst supported from the wires 15 by means of the
hangers 16 and the hangers are interconnected by the
transverse spacer members 18. The hangers 16 may be
preassembled and may be engaged with the primary sup
gitudinal edges which side ?anges form upwardly facing
port members 14 simply by sliding the hangers into the
longitudinal shoulders.
Thus each of the primary sup
open ends of the primary support members. It is to be
noted, however, that a hanger 16 may be assembled into
includes portions of the two side ?anges 28. Each of 25 engagement with a longitudinal support member instead
the channel-shaped primary support members 14 is fur
of being introduced into an open end of the primary sup
ther formed with inwardly and downwardly turned ?anges
port member. Thus it is a simple matter to engage the
port members has a bottom face 30 on its underside which
32 along the top edges of the side webs 25.
It is apparent that such a channel-shaped primary
two brackets 3., separately with the opposite inwardly
turned ?anges 42 of a primary support member and then
support member 14 may be formed in various ways, for 30 to interconnect the two brackets by the bar 36 to com
example by assembling and interconnecting longitudinal
plete the hanger. It is also apparent that, if desired, the
elements or sections, or by extrusion in one piece. In
the present embodiment of the invention, a channel
corresponding transverse spacers 18 may, if desired, be
connected to the brackets 18 before the hanger is com
shaped primary support member 14 is formed by bending
pleted by connecting the bar 36 with the two brackets.
With a uni?ed ceiling grid completed by interconnect
or folding a single piece of sheet metal.
In such a 35
construction, the two side ?anges 28 are of folded sheet
metal to provide double thickness for strength.
Each of the hangers 16 may be of the construction
shown in FIG. 3. Each hanger 16 comprises a horizontal
ing the suspended primary support members 14 by the
have upper ?anges 40 for overlapping relation with the
supported by only a section 2011 of a T-spline, the second
section 2% being absent. To install the next successive
transverse spacers 18, it is a simple matter to install the
rows of tiles 11 by means of the inverted T-splines 29.
In installing a series of tiles 11 in sequence, a newly in
metal bar or strap 36 and a pair of brackets 38 at the 40 stalled tile is supported at one end by a T-spline 20 that
opposite ends of the bar, each of the two brackets being
has both of its sections 20a and 20b assembled together.
a formed thin metal bar or strap. The two brackets 38
The other end of the newly installed tile, however, is
ends of the bar 36 and are offset to form V-shaped
grooves 42 to hook under the corresponding inwardly
turned ?anges 32 of a primary support member 14. Each
of the brackets 38 is further formed with an inwardly
turned bottom ?ange 44 to nest into the bottom of the
associated primary support member 14.
The central bar 36 of a hanger 16 has a central aper
ture 45 and two end apertures 46. The central aperture
45 receives a vertically adjustable eye-screw 48 that is
attached to the corresponding wire 15 and is equipped
with a pair of nuts 50 to clamp against the opposite faces
tile, the missing T-spline section 20b is engaged with the
kerf of the new tile and then the new tile is maneuvered
into position to assemble the missing T-spline section 20b
to the T~spline section 20a.
It is apparent that a row
of tiles 11 may be quickly and easily installed in this
manner.
The ?at splines 22 serve to seal the kerfs that extend
along the side edges of the primary support members 14.
These ?at splines 22 are simply inserted into the two
opposite kerfs of a tile 11 before the tile is maneuvered
into its assembled position. When the tile is in its as
sembled position, the two ?at splines 22 on its opposite
sides rest on the side ?anges 28 of the corresponding
of the bar.
The upper ?ange 40 ‘of each of the brackets 38 of the
hanger assembly has an aperture 52 to register with the
corresponding end aperture 46 of the central bar 36 to
primary support members 14. The installed ?at splines
receive a screw 54, the screw being equipped with a nut
22 are in the same plane as the ?anges 64 and 65 of the
55 for securing the end bracket to the bar. In addition, 60 T-splines and occupy the spaces between the successive
the upper ?ange 40 of each bracket 38 has a second aper
T-splines. Usually, but not necessarily, the narrower tiles
ture 56 for connecting the hanger to one end of a pre
10 are installed last by using suitable adhesive material
viously mentioned elongated member 18. As best shown
indicated at 78 in FIG. 1 to bond the tiles to the bottom
in FIG. 3, the end of the corresponding elongated mem
faces 39 of the primary support members 14.
I
ber 18 is provided with an aperture 58 to register with 65
In the second embodiment of the invention illustrated
the aperture 56 and a screw 60 provided with a nut 62
by FIGS. 5, 6 and 7, the primary support members 80
extends through the two apertures 56 and 58.
are extruded members but may be made of formed sheet
In the completed ceiling, the tiles 10 are bonded to
metal or may be made in sections. Each primary support
the undersides 30 of the primary support members 14 by
member 86 is of the usual channel-shaped con?guration
adhesive material, as indicated at 70 in FIG. 1, and the 70 with a bottom web 82 and two upright side webs 84. Each
tiles 11 of the alternate rows are supported by the in
of the side Webs 84 is formed along its upper edge with
verted T-splines 20. Each of the T-splines 20 rests on
an overhanging ?ange 85 having a downwardly extending
its opposite ends on a side ?ange 28 of a primary sup
lip ‘86. In addition, each of the primary support mem
port member 14. As shown in FIG. 4, each of the T
bers 80 is formed with an angular ?ange along each of
splines 20 has opposite longitudinal ?anges 64 and 65 75 its lower longitudinal edges. Each of the lower angular
..
3,053,359
6
5
primary support member in FIG. 6, corresponding ele
ments being designated by cor-responding reference nu
?anges has a laterally extending horizontal portion 88, a
vertical downward portion 90 and an inwardly turned
horizontal edge portion 92.
In the construction shown in the drawings, the primary
merals.
support members 80 are attached by wire clips 94- to
ments of the invention will suggest various changes, sub
stitutions and other departures from my disclosure within
transverse overhead runners 95.
The runners 95 are in
turn supported by wires 96 which are adjustably con
nected to the runners by suitable eye-bolts % and pairs
of nuts 11MB‘. The wire clips 94 are U-shaped members
My description in speci?c detail of the selected embodi
the spirit and scope of the appended claims.
I claim:
1. In an acoustical ceiling construction suspended from
that are formed with hooks 102 to engage the upper ?anges 10 overhead building structure, the combination of: a plu
rality of acoustical tiles arranged in spaced parallel rows
85 of the primary support members 80 in the manner
with their bottom faces in a common plane to form por
best shown in FIG. 6.
In this practice of the invention, rows of relatively
wide tiles "1% having kerfs 105 are mounted between the
tions of a ceiling surface, said tiles having kerfs in their
edges; a series of primary support members parallel to
successive primary support members 8!} by means of 15 said rows and extending into the spaces between the rows,
each of said primary support members having laterally
secondary support members 106 that extend longitudinally
extending longitudinal ?anges on its opposite sides and
of the primary support members. The secondary sup
having a bottom face spaced above said plane, each of
port members 1416 rest on the longitudinal shoulders that
said primary support members having two upwardly ex
are formed by the horizontal portions 818 of the angu
tending side webs formed with lateral edge ?anges; hanger
lar side ?anges of the primary support members.
means connected to the overhead building structure and
Each of the secondary support members 166 may be
each engaging said two edge ?anges for suspension of the
of the angular or Z-shaped cross-sectional con?guration
primary support members; a plurality of elongated mem
shown in FIG. 6. Thus each secondary support member
bers above the level of said acoustical tiles and above
has an upper laterally extending longitudinal ?ange 108
to rest on the longitudinal shoulder of the primary sup 25 the level of said side ?anges perpendicular to said pri
port member, a vertical web 1161 to lie against the ver
mary support members and spanning the spaces between
tical portion 90 of the side ?ange of the primary support
the primary support members, each of said elongated
members being connected at its opposite ends to two of
member and an opposite lower lateral ?ange ‘112 to en
gage the kerfs 165 of the tiles 194.
said hanger means that are associated, respectively, with
A feature of this particular embodiment of the in 30 two successive primary support members whereby the‘
elongated members serve as spacers between the primary
vention is that each of the longitudinal shoulders of a
support members and cooperate with the hanger means
primary support member 80‘ is formed with an upwardly
and the primary support members to form a ceiling grid;
directed projection in the form of a longitudinal rib 114
secondary support members in the form of inverted T
and each of the secondary support members 106 is formed
with a complementary recess in the form of a longitudinal 35 splines perpendicular to said primary support members
groove 1115 for engagement by the rib. By virtue of this
and resting on said side ?anges in engagement with said
arrangement, each of the installed secondary support mem~
kerfs to support said acoustical tiles; barrier means ex
bers is positively interlocked with the corresponding pri
tending along and overlapping the juncture between said
acoustical tiles and said primary support members-to pro
mary support member 80‘.
As indicated in FIG. 5, the joints between the succes 40 vide a barrier against air flow between the tiles and the
primary support members and offer support for the edges
sive tiles 104 in a row of the tiles may be sealed against
of the tiles, and additional acoustical tiles substantially
air leakage by inverted T-splines 20. As heretofore de
coextensive with the width of said primary support mem
scribed, each T-spline 20’ is made in two sections which
bers and mounted on said bottom faces of said primary
nest together. In this instance, the inverted T-splines 21)
do not actually serve as secondary support members in 4.5 support members with their undersides in said plane to
the same manner as members 20 in the FIGURE 1 em
complete the ceiling surface.
2. In an acoustical ceiling construction suspended from
bodiment because they are supported by the tiles 104- in
overhead building structure, the combination of: a plu
stead of serving to support the tiles. However the in
rality of acoustical tiles arranged in spaced parallel rows
verted T-splines 20 in FIGURE 5 do act as secondary
support members by reason of the support they inherently 50 with their bottom faces in a common plane to form por
tions of a ceiling surface, said tiles having kerfs in their
provide for the tiles along the joint between successive
edges; a series of primary support members parallel to
tiles 104.
>
said rows and extending into the spaces between the rows,
The ceiling is completed by rows of tiles 116 which
each of said primary support members having a bottom
are mounted directly on the primary support members
85. Each of the tiles 116 is formed with kerfs 118 in its 55 face spaced above said plane, each of said primary sup
port members having angular ?anges on its two opposite
opposite edges and these kerfs are engaged by the hori
lower longitudinal edges, each of said ?anges forming a
zontal edge portions 92 of the angular ?anges of a pri
longitudinal upwardly facing support shoulder along the
mary support member 85. The tiles 116 are assembled
primary support member, each of said longitudinal ?anges
to a primary support member 30 by introducing the tiles
having a portion that extends downward from said shoul-'
at the open end of the primary support members and slid
der below the bottom face of the primary support member
ing the tiles into their ?nal positions.
and that is formed with an inwardly turned edge portion;
It is apparent that in both embodiments of the inven
a plurality of longitudinal secondary support members
tion, the tiles may be readily demounted for access to
extending along said longitudinal shoulders, respectively,
the space above the installed ceiling. It is a simple matter
to push upward on an installed tile and thus lift the cor 65 and resting on the shoulders, each of said secondary sup
port members having a downwardly extending web to lie
responding section Zilb of a T-spline 20 from the com
plementary section Zita of the T-spline.
against the downwardly extending portion of the corre-'
FIG. 8 illustrates the fact that a primary support mem
ber, such as shown in FIGS. 5 and 6, may be fabricated
sponding side ?ange below said shoulder of the corre
sponding primary support member and being formed with
by joining together a plurality of longitudinal members. 70 an outwardly extending ?ange at the lower edge of said
web to engage the kerfs of said rows of tiles to support
In FIG. 8, for example, a simple channel member 120
the rows of tiles; and additional rows of tiles extending
has upwardly turned ?anges 122 to which extruded side
along the undersides of said primary support members,
members 124, respectively, are attached by suitable means,
said additional rows of tiles having kerfs engaged by said
such as spot welds 125. The ?nished primary support
member 88a in FIG. 8 provides the same elements as the 75 inwardly turned edge portions of the angular ?ange of
3,053,359
7
the primary support members for support of the additional
upwardly facing longitudinal shoulder formed along each
rows of tiles.
3. A combination as set forth in claim 2 in which each
of its sides and a vertical upwardly extending web at the
laterally inner edge of each of said longitudinal shoulders,
of said longitudinal shoulders is formed with an upwardly
each said web being formed at its upper end above the
plane of said longitudinal shoulders to be engaged in con
which each of said longitudinal members is formed with
nection of said primary support member to the overhead
a downwardly facing longitudinal groove to engage said
building structure; a row of acoustical tiles spanning the
rib.
space between the two primary support members, each
of said tiles having kerfs in its opposite edges; and a sec
4. In an acoustical ceiling construction suspended from
overhead building structure, the combination of: a series 10 ondary support member extending along one side of each
of said primary support members longitudinally thereof
of spaced parallel primary support members of formed
adjacent said row of tiles, each secondary support mem
sheet material having bottom faces in a ?rst horizontal
ber having a downwardly facing shoulder engaging the
plane; secondary support members spanning the spaces
adjacent upwardly facing longitudinal shoulder of the
between said primary support members with their opposite
corresponding primary support member, one of said en
ends resting on the primary support members; spacer
gaged shoulders being formed with a projection and the
members spanning said spaces and interconnecting said
other of said engaged shoulders being formed with are
primary support members above the level of said second
recess to receive the projection for interlocking the sec
ary support members; acoustical tiles arranged in rows
ondary support member with the primary support mem
parallel with said primary support members and occupy
ber, each of said secondary support members extending
ing the spaces between the primary support members, said
downward along the side of the corresponding primary
tiles having kerfs in supporting engagement with said sec
support member and having a lateral longitudinal ?ange
ondary support members with the bottom faces of the
at its lower edge engaging the kerfs of said tiles to sup
tiles in a second horizontal plane at a given distance below
port the tiles.
said ?rst horizontal plane; barrier means extending along
8. In an acoustical ceiling construction suspended from
and overlapping the juncture between said acoustical tiles
overhead building structure, the combination of: a series
and said primary support members to provide a barrier
of spaced parallel elongated primary support members of
against air flow between the tiles and the primary sup
formed material having bottom faces in a ?rst horizontal
port members and offer support for the edges of the tiles,
extending longitudinally rib‘ along its outer edge; and in
and additional acoustical tiles mounted on the bottom
plane; elongated secondary support members spanning
faces of said primary support members, said additional tiles
being substantially coextensive with the width of said
primary support members and being of a thickness sub
stantially equal to said given distance to place the bottom
the spaces between said primary support members with
faces of the additional tiles in said second horizontal
plane to cooperate with the ?rst mentioned tiles to pro
vides a substantially continuous ceiling surface at said
second plane with said primary support members and
secondary support members concealed above said ceiling
surface.
5. A combination as set forth in claim 4 in which said
additional tiles are adhesively bonded to the bottom faces
of the primary support members.
6. In an acoustical ceiling construction suspended from
overhead building structure, the‘ combination of: two
spaced parallel primary support members each having
upwardly facing longitudinal shoulders on its opposite
their opposite ends adjacent the longitudinal lateral edges
of the primary support members; spacer members span
ning said spaces and interconnecting said primary support
members above the level of said secondary support mem
bers; acoustical tiles arranged in rows parallel with said
primary support members and occupying the spaces be
tween the primary support members, said tiles having
kerfs in supporting engagement with said secondary sup
port members with the bottom faces of the tiles in a
second horizontal plane at a ‘given distance below said
?rst horizontal plane; barrier means extending along and
overlapping the junction between said acoustical tiles and
said primary support members to provide a barrier
against air ?ow between the tiles and the primary support
members and offer support for the edges of the tiles, and
additional acoustical tiles mounted on the bottom faces
of said primary support members, said additional tiles
being substantially coextensive with the width of said pri
ally inner edge of each of said longitudinal shoulders,
mary support members and being of a thickness to place
each said web having a con?guration at its upper end
above the plane of said longitudinal shoulders to be en 50 the bottom faces of the additional tiles in said second
horizontal plane to cooperate with the ?rst mentioned
gaged in connection of said primary support member to
tiles to provide a substantially continuous ceiling surface
the overhead building structure; a row of acoustical tiles
at said second plane with said primary support members
spanning the space between the two primary support
and
secondary support members concealed above said
members, each of said tiles having kerfs in its opposite
ceiling surface.
edges; two secondary support members for supporting said
tiles at said opposite edges, each of said secondary support
References Cited in the ?le of this patent
members having a ?rst lateral portion engaging a kerf
UNITED STATES PATENTS
at one of said opposite edges and a second lateral portion
spaced from said ?rst lateral portion, said lateral portions
714,948
Rader ________________ .._ Dec. 2, 1902
on each secondary support member extending longitudi 60 1,984,028
MacLeod ____________ __ Dec. 11, 1934
nally of the corresponding primary support member with
2,139,641
Neumeister ____ _, _____ __ Dec. 6, 1938
said second lateral portion resting on the adjacent long’
2,648,102
Jacobson ____________ __ Aug. 11, 1953
sides and a vertical upwardly extending web at the later
tudinal shoulder of such corresponding primary support
member.
7. In an acoustical ceiling construction suspended from 65
overhead building structure, the combination of: two
spaced parallel primary support members each having an
2,667,667
Jacobson _____________ __ Feb. 2, 1954
2,742,122
2,767,815
2,894,291
2,994,113
Stanley ______________ __ Apr. 17,
Brandstetter et al _______ __ Oct. 23,
Sorenson _____________ __ July 14,
Dail _________________ __ Aug. 1,
1956
1956
1959
1961
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