U.S. patent number 3,757,666 [Application Number 05/220,758] was granted by the patent office on 1973-09-11 for ceiling tile plenum boundary suspended ceiling construction.
This patent grant is currently assigned to Wehr Corporation. Invention is credited to Robert R. Lambert.
United States Patent |
3,757,666 |
Lambert |
September 11, 1973 |
CEILING TILE PLENUM BOUNDARY SUSPENDED CEILING CONSTRUCTION
Abstract
An air troffer has an imperforate flexible membrane sheet with
the outer marginal edge located between the edge of an inverted
channel section and the feet of the troffer. Upon the air troffer
being mounted on the gridwork of a suspended ceiling over an air
bar and over the ceiling tile, between the air bar and the
gridwork, the sheet drapes from the troffer over the gridwork, over
the ceiling tile and over a portion of the air bar to provide a
boundary for an air plenum which does not leak air.
Inventors: |
Lambert; Robert R. (Glendora,
CA) |
Assignee: |
Wehr Corporation (Milwaukee,
WI)
|
Family
ID: |
22824838 |
Appl.
No.: |
05/220,758 |
Filed: |
January 26, 1972 |
Current U.S.
Class: |
454/301;
55/502 |
Current CPC
Class: |
F24F
13/072 (20130101); E04B 2009/026 (20130101) |
Current International
Class: |
F24F
13/072 (20060101); F24F 13/06 (20060101); E04B
9/02 (20060101); F24f 013/06 () |
Field of
Search: |
;52/288 ;55/502,484,483
;98/4D,4DL |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wayner; William E.
Assistant Examiner: Tapolcai, Jr.; William E.
Claims
I claim:
1. In a suspended ceiling construction having a ceiling gridwork,
air distribution components integrated into the gridwork, and
ceiling tile closing the spaces between the gridwork and the air
distribution components, with at least some of said tiles forming a
boundary for an air plenum above said gridwork, the improvement
comprising the provision of
sealing membrane means overlaying all of said tiles for sealing the
boundary of the plenum formed by said tiles against the leakage of
air therethrough.
2. The improvement as in claim 1 wherein the sealing membrane means
comprises a sheet of flexible, imperforate material draped upon the
upper side of the tiles within the plenum.
3. In a suspended ceiling construction having a ceiling gridwork,
air distribution components integrated into the gridwork, wherein
the air distribution components include air control means mounted
to and between the gridwork and include an inverted channel member
mounted to and between the gridwork over the air control means, and
ceiling tile closing the spaces between the gridwork and the air
distribution components with the tile closing the space between the
channel member and the air control means with at least some of said
tiles forming a boundary for an air plenum above said gridwork, the
improvement comprising the provision of:
sealing membrane means overlaying at least some of said tiles for
sealing the boundary of the plenum formed by said tiles against the
leakage of air therethrough, said sealing membrane means comprising
a sheet of flexible, imperforate material draped upon the upper
side of the tiles within the plenum; and
means for sealingly holding the peripheral outer edge portion of
said sheet of material against the channel member.
4. The improvement as in claim 3 wherein the inverted channel
member includes as inverted channel section, and feet means for
mounting the channel section to the gridwork, and wherein the
holding means includes the provision of a wall on the feet means
and against the channel section, said sheet having its peripheral
outer edge received between the channel section and the wall of the
feet means to sealingly engage the channel section.
5. An improved air troffer for use with a suspended ceiling
gridwork of main and cross runners having air control means mounted
to and between a first pair of runners, and extending parallel to
but spaced from an adjacent second pair of runners, and having
ceiling tile extending between and supported by the runners and the
air control means, said air troffer comprising
an inverted channel section,
feet means for mounting the inverted channel section to the
adjacent pair of runners over the air control means, and
sealing membrane means sealingly attached to the section for
draping across the tile and against the air control means to
sealingly close the opening of the channel section around the air
control means.
6. The invention as in claim 5 wherein the sealing membrane means
includes a sheet of flexible imperforate material suitably sized to
drape across the ceiling tile and against the air control means,
and means for sealingly attaching the sheet to the inverted channel
section.
7. The invention as in claim 6 wherein the means for sealingly
attaching the sheet includes the provision of walls on the feet
means for receiving thereagainst the section and the outer edge
portion of the sheet, said walls pressing the outer edge portion of
the sheet into sealing engagement with the section.
Description
BACKGROUND OF THE INVENTION
This invention relates to air distribution systems and more
particularly to such air distribution systems integrated into a
suspended ceiling wherein the ceiling forms a boundary for an air
plenum above the ceiling.
The use of air troffers to form air plenums with the suspended
ceiling tiles was previously disclosed in my copending application
for United States Letters Patent, Ser. No. 133,284 filed Apr. 2,
1971, now U.S. Pat. No. 3,690,243 and entitled "Suspended Ceiling
Framework Supported Troffer Air Distribution System."
In that application, a system is disclosed which has effectively
continuous arrays or rows of resilient inverted channel members,
each having lower feet thereon for insertion on and between the
runners of a suspended ceiling framework over an air control means
extending between the runners. Ceiling tiles are inserted between
the runners and the air control means to close the inverted channel
members for conducting air therealong for delivery to the air
control means.
In using the air troffer, it was discovered that air losses
occurred due to the lack of an effective seal between the ceiling
tile and the supporting structure of the ceiling tile, i.e., the
runners and the air control means. For many uses, this air leakage
is not objectional and in fact adds to the ventilating of the
system. However, for other uses, any air leakage is objectionable.
For these other uses, the system of air troffers closed by ceiling
tile is not suitable.
It would seem a simple matter to seal the junctures of the ceiling
tile with the runners and with the air control means, but it is
not. The ceiling tiles, for example, could be caulked about their
peripheral edge but there is no simple way to apply pressure to the
caulking when the tile is positioned on its supporting structure.
Also the use of caulking would prevent the raising of the ceiling
tile to gain access to the air control means of the troffer. Other
conventional methods of sealing the ceiling tile to the runners and
the air control means also present these or similar disadvantages
which makes them unsuited for this purpose.
BRIEF DESCRIPTION OF THE INVENTION
Therefore it is the primary object of this invention to provide a
novel air distribution system wherein the suspended ceiling forms a
boundary for an air plenum above the ceiling without the loss of
air through the ceiling.
Other and additional objects of this invention are to provide such
a system wherein the junctures between the ceiling tiles, the
gridwork and the air distribution components are sealed against the
passage of air therethrough; to provide such a system wherein the
ceiling tiles can be raised and returned to their position on the
gridwork without destroying the seal; to provide such a system
wherein sealing occurs automatically upon pressurization of the air
plenum; to provide such a system wherein the sealing means drapes
across the ceiling tile, the ceiling gridwork and the ceiling air
distribution components; to provide such a system in which the
sealing means is secured to the walls defining the plenum chamber;
and to provide such a system which is inexpensive to manufacture,
to install, and to maintain to effectively prevent air leakage from
the air plenum through the ceiling tiles and their junctures with
the ceiling gridwork and the air distribution components.
Generally, stated, the suspended ceiling construction has a ceiling
gridwork, air distribution components integrated into the gridwork,
and ceiling tiles closing the spaces between the gridwork and the
air distribution components, with some of the tiles forming a
boundary for an air plenum above said gridwork, the improvement,
according to this invention, including the provision of sealing
membrane means overlaying at least some of the tiles for sealing
the boundary of the plenum formed by the tiles against leakage of
air therethrough. The sealing membrane means may be a sheet of
flexible imperforate material draped upon the upper side of the
ceiling. The air distribution components may include an air troffer
to which the outer edge of the sheet is sealingly attached between
the feet and the channel section thereof and may include air
control means against a portion of which the sheet drapes.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a suspended ceiling having the
improved ceiling tile plenum boundary construction, according to
this invention.
FIG. 2 is an enlarged, fragmentary, end cross-sectional view of the
suspended ceiling of FIG. 1 showing the sealing membrane sheet
carried by the air troffer and draped across the ceiling tile, to
the air diffuser assembly to prevent air leakage.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawing and particularly to FIG. 1, the
suspended ceiling construction is generally denoted by the number
10. The suspended ceiling 10 is shown mounted in a room 11 to
provide an attic space 12, above the suspended ceiling 10 and below
the real ceiling of the room, in which heating and air conditioning
ducts, utility ducts, etc., are mounted.
The illustrated suspended ceiling has a ceiling grid work 13
dividing the ceiling space into smaller generally rectangular
spaces. The gridwork 13 includes main runners 14a and cross runners
14b of inverted T-bar members. The inverted T-bar members each have
a horizontal flange 15, a vertical web 16 and a head ridge 17. The
gridwork 13 is hung from the real ceiling of soffet wires 18.
Ceiling tile 19 of suitable rectangular shape and size are inserted
into the rectangular spaces to rest upon and extend between the
horizontal flanges 15 of the runners 14.
The illustrated suspended ceiling 10 also has air distribution
components 20 located therein to be supported thereby. The air
distribution components 20 illustratively include air control means
such as an air diffuser assembly 21 as is taught in my copending
application for U.S. Letters Patent Ser. No. 815,838, filed Apr.
14, 1969, now U.S. Pat. No. 3,598,283 and entitled "Suspended
Ceiling Integrated Air Distribution System."
The air diffuser assembly 21 is constructed of spaced inverted
T-bar members 22; each having a horizontal flange 23; a vertical
web 24; an inside, upwardly extending rib 25 in the flange 23 and
spaced from the web 24; and a head ridge 26 with an upwardly
opening longitudinal groove 27. Weir-supporting inverted channels
28 have the lower edges thereof inserted into the space between the
ribs 25 and the vertical webs 24 to seat on the horizontal flanges
23 of the inverted T-bar members 22. The webs of the channels 28
space the members 22, and support a nested pair of weir members 29
as is taught by my U.S. Pat. No. 3,411,425. Plates 30 extend under
the head ridges 26 to abut the vertical webs 24 and space them
apart while retaining the nested weir members 29 on the channels
28. The air diffuser assembly 21 is completed by the provision of
an extractor channel 31 with the lower edges located in the grooves
27 of the head ridges 26 while the perforated web thereof, having
extractor vanes 32, is centrally located over and between the
spaced inverted T-bar members 22.
Illustratively, the air diffuser is shown extending between main
runners 14a and centrally located between cross runners 14b. The
spaces between the inverted T-bar members 22 of the air diffuser
assembly 21 and the adjacent inverted T-bar members of the runners
14 are closed by specially sized ceiling tile 19 extending between
the flanges 23 and 15 to rest thereon and close the space
therebetween ready for forming an air plenum 40.
The air plenum 40 is provided for carrying conditioned air to the
attic place 12 over the air diffuser assembly 21 to pass through
the air diffuser assembly 21 and be diffused throughout the room
11. The exemplary air plenum 40 includes an inverted channel member
or troffer 41 as is taught by my copending application for U.S.
Letters Patent, Ser. No. 132,284, filed Apr. 2, 1971, and entitled
"Suspended Ceiling Framework Supported Troffer Air Distribution
System." The troffer includes the provision of an originally
generally flat rectangular ductboard section 42. The ductboard
section has been longitudinally notched to be folded into an
inverted channel member 41. The individual sections, may be taped
at 43 to be joined together, ready to receive feet means 50 on the
lower edges 44 thereof.
Feet means 50 are provided for mounting the inverted channel
members to the adjacent runners 14. The feet means 50 include an
upwardly opening channel portion 51 sized to receive the lower
edges 44 of the sections 42 therein, with an interference fit. The
side walls of the channel portion 51 have downwardly pointing teeth
52 therein, which extend into the ductboard section 42 adjacent the
lower edges 44 to hold the lower edges 44 within the foot channels
50. The foot channels 50, each also have offset foot portion 53
with a lower edge 54 for resting on the flange 15b adjacent the web
16b of the cross runners 14b. An upper edge 55 is provided on the
foot portion 53 for extending under the head ridge 17b of the cross
runner 14b. The upper and lower edges 55 and 54 vertically hold the
feet means 50 to the cross runners 14b. The insertion of the
ceiling tile 19 holds the foot portions 53 against the vertical
webs 16b while closing the lower open side of the inverted channel
members or troffers 41 for carrying air.
As the air passes down the troffers 41, the junctures of the
ceiling tile 19 with the runners 14 and with the air diffuser
assembly 21 may present gaps through which the air can leak through
the suspended ceiling 10 and into the room 11 therebelow, without
being properly diffused by the air diffuser assembly 21. In order
to prevent such leakage of air, sealing membrane means 60,
according to this invention, are provided for sealing the boundary
of the plenum, formed by the tiles 19, against the leakage of
air.
In the preferred embodiment the sealing membrane means 60 includes
a sheet 61 of flexible imperforate material, preferably a thin
plastic sheet. The sheet 61 is generally rectangular in shape and,
as best seen in FIG. 2, has its peripheral outer edge inserted into
the channel portion 51 of the feet means 50 under the lower edge 44
of the ductboard section 42 to be sealingly held thereby to the air
troffer 41. The teeth 52 will extend through the sheets 61 to hold
the sheet 61 in the channel portion 51 of the feet means 40 while
the walls of the channel portion 51 press the sheet sealingly
against the section 42. The sheet 61 will drape or overlay from the
feet means 50 along the ceiling tile 19 and along one side of the
web 24 of the air diffuser assembly 21, to provide a boundary which
is unbroken and so can not leak air. Upon pressurization of the
plenum, the air therein will press the sheet 61 against the ceiling
tile 10 to conform the sheet 61 the upper surface of the runners
14, ceiling tile 19 and a portion of the air diffuser 21 to provide
a sealed upper surface which acts as the boundary of the air
troffer 41.
If for any reason, access is needed into air troffer 41 or into the
attic space 12 above the suspended ceiling 10, the ceiling tile 19
may be raised, raising the sheet 61 to provide such access. Upon
lowering of the ceiling tile 19 and repressurization of the troffer
41, the sheet 61 will reseal against the upper surface as before to
prevent any air leakage.
Thus the improvement, according to this invention, in a suspended
ceiling construction provides sealing membrane means to close the
junctures between the ceiling tile and the runners and the air
distribution components to provide a boundary for an air plenum
which is sealed against air leakage therethrough.
* * * * *