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Патент USA US3089036

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May 7, 1.963
3,089,026 '
Filed Oct. 50,‘ 1961
2 Sheets-Sheet 1
Edward M. Caferra
May 7, 1963
Filed Oct. 30, 1961
.2 Sheets-Sheet 2
Edward M. Caferra
m FM
A ttys.
United States Patent 0
Patented May 7, 1963
is illustrated in FIGURE 11. It utilizes a basic rectangular
shape which may be repeated across a ceiling as desired.
Edward M. Caferro, Spokane, Wash, assignor to Colum
bia Electric & Manufacturing Company, Spokane,
The ?xture includes a pair of parallel spaced channels 10
formed of sheet metal and including opposed vertical
sides 11. The channels are provided with typical mount
Wash, a corporation of Washington
Filed Oct. 30, 1961, Ser. No. 148,475
3 Claims. (Cl. 240-5111)
ing ?anges 12 adapted to facilitate the positioning of the
channels on the supporting ceiling structure. The ?anges
12 may be replaced by any suitable type of mounting
The present invention relates to a novel lighting ?xture
bracket. Each channel 10 has mounted thereon a plural
designed to be pre-wired at the manufacturing factory. 10 ity of pairs of conventional lamp sockets 13. Each pair
of sockets 13 is designed to mount a ?uorescent lamp
The evolution of ?uorescent lighting ?xtures has created
a demand for a system of components which may be
adapted to custom installations. Normally such installa
between them. These sockets 13 are of conventional
design and may include the necessary starters or other
circuitry required for proper functioning of the ?xture.
tions, whether in new or remodeled buildings, include a
ceiling lighting assembly which is covered by one of many 15 A ?uorescent lighting ?xture also requires a conventional
ballast assembly designated as 14. The position of this
various forms of false ceilings designed to allow the effec
ballast is illustrated in the top view shown in FIGURE
tive transmission of light to the room below. This system
4. The ballast is located within the side channels 10
therefore allows the use of modular lighting units which
need not be decorative in themselves. The main criteria
rather than at a central position as is conventional in most
for such a ?xture is case in fabrication and ease in instal
The basic concept of this invention is to provide a
The present invention concerns itself with each of these
last two problems. It contemplates a lighting ?xture as
sembled from a minimum of common components. The
completely pre-Wired ?xture which is capable of being
shipped in a knocked-down condition and which may be
easily prepared for installation at its ?nal site. In order
most important feature is the utilization of factory wiring. 25 to accomplish this end, the vertical sides 11 are provided
with circular apertures which receive a ?tting having a
By this provision, the electrical components of the lighting
cylindrical sleeve 16 extending outwardly from the sides
?xture are entirely wired at the factory, making full
11. The sleeve 16 terminates inwardly at an exterior
radial shoulder 17 which abuts the outer surface of the
elfect savings in time and insuring more uniform quality
in the ?nal product. The invention also concerns itself 30 side 11 on the channel 10 on which it is mounted. The
interior end of the ?tting is provided with a threaded sec
with savings in transportation by providing a completely
tion ‘18 on which is threadably engaged a lock nut 20
pre~wired unit which is capable of being shipped in a
adapted to abut the inner surface of the respective side
knocked-down form so as to save on freight bulk. It
11. Thus the compressive engagement of lock nut 20
facilitates installation by the fact that it is pre-wired and
by the fact that each modular unit may be readily assem 35 and shoulder 17 serves to effectively ?x the ?tting relative
to the channel 10.
bled at the site on which it is to be mounted without the
The factory assembly of the lighting ?xture includes the
necessity of special tools or skills.
utilization of modern methods of mass production to
It is a ?rst object of this invention to provide a modular
installation of the ?ttings plus the ballast 14 and the nec
lighting ?xture which can be completely pre-wired and 40 essary lamp sockets 13. It also includes the installation
of a complete wiring harness including interconnecting
which may be shipped in a knocked-down form which is
wiring 15 which is extended through the ?tting sleeves 16
relatively small in relation to the size of the installed unit.
of aligned apertures on the two opposed sides 11. The
It is another object of this invention to provide such a
wiring 15 completes the necessary circuits between the
unit in as simple a form as possible. No special tools or
skills are required in order to set up the ?xture for proper 45 electrical components mounted on each of the channels
10. The length of the wires is suf?cient to insure the
proper spacing of the two channels 10. The ?xture is then
of the accompanying drawings and the following descrip
shipped in a knocked-down form with the two channels
10 not rigidly interconnected. The remaining portions of
tion which describe a preferred form of the invention.
This form is exemplary and is not intended to limit the 50 the ?xture may be shipped independently so as to enable
one to provide a shipping package which is extremely
scope of this invention which obviously may extend to
compact compared with the product to be installed at the
many various types of ?xtures.
In the drawings:
FIGURE 1 is a perspective view of a lighting ?xture
The ?xture is completed at the site by the installation
These and other objects will be evident from a study
illustrating both the installation and fabrication of the 55 of conduit spacers 21 which structurally connect the two
channels '10. Each spacer comprises a pair of identical
?nal unit;
FIGURE 2 is a vertical sectional view taken through a
?xture channel adjacent one of the supporting conduit
FIGURE 3 is a fragmentary vertical section view taken 60
through one of the conduit spacers mounted on a ?xture
FIGURE 4 is a top view of a lighting ?xture con
elements 22. The elements 22 have a substantially semi
cylindrical cross section and are positioned about the
outer periphery of aligned ?tting sleeves 16 with one
element 22 being inverted relative to the other. The
elements 22 are each provided with longitudinal edges 23
and 24. The edges 23 and 24 are complementary to one
another and are designed to allow the two elements 22
to be rigidly interconnected along the edges 23, 24 by a
structed according to the present invention, showing the
conduit spacers and lamps in place; and
65 simple compressive force being exerted against the two
FIGURE 5 is a sectional view taken through line 5-5
in FIGURE 2 at an enlarged scale.
opposed elements 2.2. The particular cross sectional con
?guration utilized in the preferred embodiment of this
invention is illustrated in FIGURE 5. This con?guration
provides an extremely e?ective seal and cannot be readily
The lighting ?xture constructed according to this in
vention is a modular unit designed particularly for custom
ceiling installations. The ?xture itself has a purely utili 70 pried apart, once assembled. The elements 22 can be
easily manufactured by an extrusion process.
tarian function in the proper mounting of the lamps which
Each element 22 is provided with an aperture 25 adja
are to be erected above a false ceiling. A typical ?xture
cent each of its ends. These apertures 25 are adapted to
receive projecting pins 26 formed on the exterior surfaces
a ballast mounted within one of said channels;
‘ 26 and apertures 25 prevents the conduit spacers 21 from
a pre-assembled wiring harness including said pairs of
lamp sockets and said ballast and interconnecting
wiring extending across the separation between each
moving longitudinally or rotationally relative to the ?t
pair of channels, said interconnecting wiring being
tings on which it is mounted. Thus the ?xture, when as
sembled, attains a relatively rigid stature and is com
pletely ready for installation with but a few minutes of
located across aligned pairs of apertures on said chan
of the respective sleeves 16. The interaction of the pins
nels and through the ?ttings mounted therein;
individual conduit spacers mounted on the ?ttings in
each aligned pair of apertures in coaxial relation
The conduit spacers 21 serve a double pur
pose in enclosing the wiring 15 and also as structural 10
spacers to locate the respective positions of the channels
10. The simple interconnection provided between the ?t
ting sleeves 16 and the conduit spacers 21 provides an
accurate method of assembling the ?nal ?xture structure.
After the conduit spacers .21. are locked between the 15
channels 10 the ?xture may be completed by the installa
tion of conventional re?ectors 27 between the channels
10 and the installation of the necessary lamps 28 between
the sockets 13. It is not necessary to disturb the factory
wiring in any manner. This provision insures the proper
wiring connections between the many components in the
thereto, said spacers being longitudinally split
throughout their length, said interconnecting wiring
being surrounded by the assembled conduit spacers,
the split edges of said conduit spacers being provided
with interlocking means adapted to lock the edges
to one another when assembled;
and positioning means operatively connecting each of
said conduit spacers and the ?ttings on which it is
mounted adapted to prevent longitudinal or rota
tional motion of said conduit spacer relative to the
respective ?ttings.
2. A ?xture as de?ned in claim 1 wherein each of said
?ttings comprises:
two channels 10 and eliminates the chance of error at the
job site. The combination of increased wiring e?iciency
and decreased shipping costs makes this form of‘ lighting
an open tubular sleeve having an exterior shoulder
at a relatively low cost and the use of factory mass pro
abutting the outer surface of the vertical channel
side on which the ?tting is mounted;
an exteriorly threaded section on the ?tting adjacent the
shoulder and extending within the channel;
duction in assembling the electrical parts of the ?xture
and a lock nut threada-bly engaged on said threaded
reduces its ?nal installation cost.
section abutting the inner surface of the vertical
channel side on which the ?tting is mounted;
said positioning means comprising a radially projecting
pin ?xed to the exterior of said sleeve and received
within a complementary opening on the conduit
spacer mounted thereon, the split edges of said con
?xture exceptionally attractive from a manufacturer’s
viewpoint. The ?xture components may be manufactured
The form of the ?xture illustrated in the drawings is 3O
merely one example of a ?xture including the concepts
of this invention. The relative size and shape of the
channels 110 and spacers 21 may obviously be changed
without deviating from these basic concepts. Other forms
of'interlocking edges may be utilized on the spacers 21 35
so long as a longitudinally split conduit spacer is utilized
so as to allow the enclosure of wire 15 after being factory
duit spacers being locked to one another.
3. A ?xture as de?ned in claim 1 wherein each conduit
spacer comprises:
pre-wired and shipped in a knocked-down condition. The
channels 10 may obviously be changed to accommodate
the type and number of lamps desired. For these reasons
the description of this embodiment is not intended to re
strict the extent of my invention which is de?ned in the
claims which follow.
Having thus described my invention, I claim:
a pair of identical longitudinal elements having a gen
erally semi-cylindrical cross section, the longitudinal
edges of each element being complementary when
said sections are positioned opposite to one another
with one of said elements being inverted, the edges
of the elements being securely fastened to one an
other throughout their lengths, thereby presenting a
1. A ceiling ?uorescent lighting ?xture comprising:
fully enclosed receptacle for said interconnecting
a pair of parallel ?xture channels adapted to be sup
ported on a ceiling structure, each pair of channels
including opposed vertical sides spaced from one
another and provided with aligned pairs of open
tubular ?ttings ?xed to said channels and extending out—
Wardly therefrom through said apertures;
aligned pairs of lamp sockets for ?uorescent lamps ?xed
to the channels, each pair of sockets being adapted to
receive a lamp therebetween;
References Cited in the ?le of this patent
Hodkinson ___________ __ June 27, 1916
Kachale et al __________ __ Mar. 17, 1953
Kruger _____. __________ .. Apr. 3, 1956
Cline _______________ __ Mar. 11, 1958
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