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Патент USA US2123410

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Filed April 9, 1957
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» ¿Planes NFAwcfr-f;
f _ Patented‘Juiy
>¿123,410 `
charles w. Fawcett, si. una, mi.
K .Application Apro 9, 1937, sensi No. lasers
lclaim. (Cl. 20-92)
My invention relates to a new and useful im- . ter boards at their ends. `I preferably employ a
provement in air ducts, and has for its object material known as “gypsum-boards”, which are
' to vprovide a simple, inexpensive, and highly sat
universally sold in commercial practice. I have
isfactory medium for attaching' `together the designated these gypsum boards by the letter D
plaster board members of the air duct so that in the drawing. These gypsum boards are .of any
‘ a continuous duct is provided through which a
column of air may flow from one point to an
Such air ducts are usually rectangular
- ' in cross-section, and may consist of two, three,
10 or four walls of plaster board, the lother wall
or walls being formed by the partition wall or
the ceiling of the building in which the air duct
is located. My invention is equally applicable
where plaster board ‘1s employed in any or all
such walls.
>usual lengths such as are marketed commercially,
and they are adapted vto have plastering nor
mally applied thereto.
In Fig. 1 I show a length of ‘T iron i, in the
web member 2 of which I have placed saw cuts 3 10
which extend through said member to the ilange
member 4. "I'hese cutsv 3 are placed at the point
where the T iron I is to be bent.
, In Fig. 2 I have shown the T iron i in bent
VAposition to ‘illustrate how the web member 2 ap
Another ¿object is to provide a simple means
pears after the bending operation is completed.
-ior securing the air duct to the wail or ceiling
The web sections i serve as division members be
tween the ends of the gypsum boards D. In these
Where the Wall‘or ceiling, or both, comprise one
or more of 'the walls oí the duct. By my ar-_ web sections i I provide perforations 5 to re-`
rangement a lightweight air duct structurels ceive nails t, which have enlarged heads l. for a 20
formed, and one which can be easily and eco-. purpose to'be described.
nomicaily constructed.
Fig. l is a perspective view of a length of T
iron with saw cuts therein at the bending points,
25 fromV which I form my joining member.
l Fig. 2 is -a perspective view of a length of T
iron bent to form a joining member.
Fig. 3 _is a. side elevation of a length of air
` duct. partly in section, with my improved join
30 ing members in place.' ,
Fig. 4 is a cross-sectional view through an air
duct,‘ taken on line ll-l, Fig. 3, lookingdn the
directional’ the arrows.
. 5 is an enlarged fragmentary detailed
View, partly in section, taken on the line .fi-ü
oí-Fig. 3, looking in the direction of the arrows.
Fig. 6 is a rcrom-sectional view taken through»
an air duct where two of the walls thereof are
plaster board, one is a side or partition wall and
one is the ceiling Vof the building, two methods
oi ‘securing the air duct to the wall and ceiling
In the structure illustrated in Fig. 3 the gypsum
boards D have a surface adapted to receive plas- L
ter which adheres tenaciously thereto.
gypsum Aboards are of suitable lengths and are 25
cut straight across at their ends.
en the
gypsum boards are to be assembled to form an
air duct unit such as is illustrated in Fig. il,` the
top and bottom boards extend across the side
boards 'so that nails 8 may be driven through the 30
top and bottom boards into the edges oi the side
boards, and thereby »hold said structure ` thus
formed in a compact, rectangular form. The
ends of the4 gypsum boards D .are then passed
over- the Bange member »I and abut against the 35
web member 2.V The nails 6 are then inserted
through the perforations 5 in the >web members
2 and may be driven through said perforations
suiïlcientlif to cause the heads 1 of said nails 8
to gouge through the surface ofthe vgypsum 40
lboards D. By. this means a gripping action on
the boards D is obtained by the nails ß. This .
In the drawing. the air duct A is shown in con-` action is clearly shown in the enlarged detail`
venticnal form and may consist of a passagè
view of
way formed oi’ four sides of plaster board, as ' The nails 6 are shown in Fig.'3 with heads 'l
illustrated in Fig. 3,7or it may be formed of two alternating along the web member 2 with the,
' sides'ot plaster board withthe
B serv
_ points oïffsaid nails so as to force the wall niem-l
lng as one side 'of said
way and a .parti “bers D into close contact with the flange l and Y `
tion .wail C as another side. Also. there could web 2 of the joining member E.
be three sides of plaster board and one side ~
Any appropriate means for supporting the duct
f 'formed by either the ceiling or the" partition wall. shown in Fig. 3 may be employed, auch as rope '50
such arrangement being well understood in theV or chain hangers or brackets. IV have illustrated
_ lMy inventionV particularly relates to the man
li ner of joining togetheráand supporting the plas
two methods of‘support in Fig. 6.> In the upper.
or ceiIingstruotureïQB-I have employed an anchor
9 placed-in said
`ain-aanzet Il on the join# 55
wall members, comprising a' joining metal mem
ber of the shape having a web and a ñange mem
secure an upper corner of the duct A to said ceil
ing. At the lower right-hand side of said draw- . ber, said flange memberv supporting the lends of
ing member E,k and a bolt or’screw H adapted to
ing in Fig. 6 I haveillustrated a plug I2 adapted
to be placed in the partition wall C and appro
priately secured to the duct A by wire loops I3.
The T iron supporting member E is highly ef
said individual wall members and which ends
abut against the web members, said web mem
ber being perforated to receive nails each hav
ing 'a head and a point for holding said wall
` fective for the purpose for which I employ it, and
members in contact with said web and flange
reducesthe cost of constructing air ducts of this
type considerably, both in labor and material.
When plastered these air ducts present a pleasing
members, said nails being passed through said
perforations with heads and points alternating
appearance and are very emcient in operation.
I claim:
A joint for an air duct, formed of individual
about said joint, said web members being cut
transversely at intervals so said ñange mem
bers can be bent at said cut portions.
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