U.S. patent number 3,560,729 [Application Number 04/800,111] was granted by the patent office on 1971-02-02 for lighting fixture.
Invention is credited to Milton Liberman.
United States Patent |
3,560,729 |
Liberman |
February 2, 1971 |
LIGHTING FIXTURE
Abstract
A lighting fixture for mounting within a ceiling recess
including a pair of spaced elongated elements having recesses
containing light sources disposed therein and shielded from direct
view and light-reflecting means bridging said elements to reflect
the light from the lighting means downwardly, the elements and
reflectors being adapted to be placed in end-to-end relationship to
form a lighting fixture of any desired length and the elements
further include means for supporting adjacent ceiling elements when
used in connection with hung ceilings and the reflectors may be
integrated with air-conditioning means and auxiliary incandescent
illumination.
Inventors: |
Liberman; Milton (East
Rockaway, NY) |
Family
ID: |
25177513 |
Appl.
No.: |
04/800,111 |
Filed: |
February 18, 1969 |
Current U.S.
Class: |
362/294; 362/241;
362/347; 362/264; 362/364 |
Current CPC
Class: |
F21V
33/0088 (20130101) |
Current International
Class: |
F21V
33/00 (20060101); F21s () |
Field of
Search: |
;240/13B,51.11,9,9A,41.1 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Horan; John M.
Assistant Examiner: Clement; D. J.
Claims
I claim:
1. A lighting fixture for use with hung ceilings comprising a pair
of spaced parallel, relatively rigid elements each having a
substantially flat bottom plate, a baffle plate along the inner
edge of each bottom plate, and an upwardly extending plate
extending along each bottom plate with at least one upwardly
extending plate on one element being spaced inwardly from the outer
edge of said bottom plate to form an outwardly extending flange,
lighting means supported between said baffle and said upwardly
extending plate, concave light-reflecting means bridging said
elements and directing light emitted by said lighting means in a
downward direction and means for supporting said elements with said
bottom plates substantially coplanar with said hung ceiling.
2. A lighting fixture according to claim 1 wherein said concave
light-reflecting means comprises two elongated concave sections
joined to form a central longitudinal V-shaped portion.
3. A lighting fixture according to claim 1 wherein each upwardly
extending plate includes an inwardly extending flange spaced from
the upper edge thereof and an L-shaped member below and in spaced
relationship to said flange and said reflector includes spaced
offset tabs engaging said L-shaped members and flanges.
4. A lighting fixture according to claim 1 wherein said upwardly
extending plate on each of said elements is spaced inwardly from
the outer edge of said bottom plate.
5. A lighting fixture according to claim 4 wherein each of said
upwardly extending plates includes longitudinally spaced openings
for engagement with T-bars of a hung ceiling. 6A lighting fixture
according to claim 1 including a ballast housing disposed above one
of said elements and means including a wire-receiving channel
securing said ballast housing to said
element. 7. A lighting fixture according to claim 1 wherein said
reflector includes a longitudinally disposed louver assembly and
said fixture further includes a longitudinally disposed
air-conditioning duct having an
opening communicating with said louver. 8. A lighting fixture
according to claim 7 wherein said louver assembly includes dampers
for controlling the
flow of air through said louvers. 9. A lighting fixture according
to claim 1 wherein said reflector includes at least one opening
therein, a housing overlying said opening and secured to said
reflector and incandescent lighting means disposed within said
housing and directing light downwardly
through said opening. 10. A lighting fixture according to claim 9
wherein said reflector includes a longitudinally disposed louver
assembly, and said fixture further includes a longitudinally
disposed air-conditioning
duct having an opening communicating with said louver. 11. A
lighting fixture according to claim 1 wherein the other of said
elements has its upwardly extending plate disposed centrally of
said bottom plate and the outer edge of the last said plate
includes a second baffle extending along the length thereof, the
last said plate supporting one edge of a second reflector in
side-by-side relationship to the first said reflector.
Description
This invention relates to lighting fixtures and more specifically
to a novel and improved lighting fixture construction which
simplifies fabrication and installation of the fixture and which
may be readily coordinated with air-conditioning equipment and
incandescent light sources.
Ceiling lighting fixtures and particularly lighting fixtures
adapted to be coordinated with hung ceilings generally involve
housings recessed within the ceiling and lenses closing the
openings in the housing to distribute the light emitted from the
light sources. Other types of ceiling fixtures are frequently
secured to the surface of the ceiling and include means for
directing a portion of the light upwardly toward the ceiling and
the remainder of the light downwardly for general illumination.
Substantial efforts have been made to provide good general
illumination while at the same time baffling the lamps and
particularly fluorescent lamps from direct view. This invention
overcomes the problems heretofore encountered in known lighting
fixtures and particularly fluorescent fixtures by providing a novel
and improved organization and arrangement of elements whereby the
fluorescent lighting sources are disposed within elongated recesses
and reflecting means bridge the elements to reflect light emitted
from the lamps downwardly for general lighting. With this
arrangement the lamps are readily accessible for replacement, are
completely hidden from view and multiple fixtures can be arranged
in integrated side-by-side relationship and end-to-end relationship
so that any desired lighting configuration can be obtained.
Another object of the invention resides in the provision of a novel
and improved fixture wherein spaced elongated elements are utilized
having recesses therein for receiving the lamps and which elements
are so arranged and constructed to facilitate formation by
extrusion processes which greatly reduces the cost of the fixture.
A reflector is supported by and between the elements and the
elongated elements are also provided with means for supporting
adjoining ceiling portions when the fixture is utilized in
combination with a conventional hung ceiling.
Still another object of the invention resides in the provision of a
novel and improved fixture integrally coordinated with
air-conditioning means in a manner that will have a minimum effect
on the fluorescent tubes utilized as the light sources and may be
tinted to blend with room decors.
Still another object of the invention resides in the provision of a
novel and improved fluorescent light fixture which may also embody
incandescent illumination in order to more nearly approach natural
lighting conditions.
Still another object of the invention resides in the provision of a
novel and improved lighting fixture characterized by its
simplicity, versatility, ease of installation and relatively low
manufacturing costs.
The above and other objects and advantages of the invention will
become more apparent from the following description and
accompanying drawings forming part of this application.
In the drawings:
FIG. 1 is a fragmentary view of a ceiling having a lighting fixture
mounted therein in accordance with the invention;
FIG. 2 is a cross-sectional view in perspective of FIG. 1 taken
along the line 2-2 thereof;
FIG. 3 is a cross-sectional view of FIG. 2 taken along the line 3-3
thereof;
FIG. 4 is a cross-sectional view of a modified embodiment of the
lighting fixture shown in FIG. 2 wherein two lighting fixtures are
mounted in side-by-side relationship;
FIG. 5 is a diagrammatic plan view of two lighting fixtures as
shown in FIG. 2 placed in end-to-end relationship and embodying
auxiliary incandescent lighting sources and together with
air-conditioning means;
FIG. 6 is a cross-sectional view of FIG. 5 taken along the line 6-6
thereof;
FIG. 7 is a cross-sectional view of FIG. 5 taken along the line 7-7
thereof;
FIG. 8 is a cross-sectional view of FIG. 6 taken along the line 8-8
thereof;
FIG. 9 is a bottom view of the fixture shown in FIG. 5 with parts
broken away;
FIG. 10 is an enlarged fragmentary section of the air-conditioning
outlet of the fixture shown in FIG. 6;
FIG. 11 is an exploded perspective view of a fragmentary section of
the air-conditioning outlet; and
FIG. 12 is an exploded perspective view of a fragmentary section of
an elongated element of the lighting fixture in accordance with the
invention to illustrate its cooperation with T-bars used to support
a hung ceiling.
The lighting fixture in accordance with the invention embodies an
improved arrangement of elements which simplifies the fabrication
of the lighting fixture and enables it to be adapted for use in a
variety of applications. As will be shown, the lighting fixture
essentially embodies a pair of spaced elongated elements which may
be interconnected with the T-bar construction of a hung ceiling. A
generally concave reflector is supported by the longitudinal
elements and reflects light emitted from fluorescent tubes
downwardly for general lighting. If desired, incandescent lamps may
be integrally coordinated with the reflector to provide a
combination of incandescent and fluorescent lighting. When air
conditioning is to be employed the fixture may be provided with a
longitudinal duct to discharge air through louvers disposed
centrally of and throughout the extent of the reflector for
discharging air downwardly. With this improved fixture the
longitudinal elements carrying the fluorescent tubes may be
extruded of a suitable metal such as aluminum and may be formed in
any desired length. The reflectors as will be shown may also be
formed in any desired length to meet particular lighting
requirements. Should it be desired to place fixtures in adjoining
side-by-side relationship a single longitudinal element may be
utilized between the fixtures which element is arranged to support
two sets of fluorescent tubes separated by a central baffle so that
one set of tubes forms part of one lighting fixture while the other
set of tubes forms part of the adjoining lighting fixture.
Referring now to the drawings and more specifically to FIGS. 1 to
3, the numeral 10 denotes one embodiment of a lighting fixture in
accordance with the invention having a pair of spaced longitudinal
elements generally denoted by the numeral 11, a reflector 12
spanning the elements 11 and ballast-containing means 13 for
operating the fluorescent tubes 14.
Each longitudinal element 11 has a flat bottom plate 15, an
upwardly and outwardly inclined baffle 16 along the inner edge of
the plate 15 and an upwardly extending plate 17 spaced from the
outer edge 18 of the plate 15 to provide a ledge or flange 19 for
supporting adjoining ceiling elements 20. Each vertically disposed
plate 17 includes an inwardly extending flange 21 and an inwardly
extending L-shaped member 22 spaced below the flange 21. The
reflector 12 may have any desired configuration though it is
preferably formed of two generally concave sections 12a and 12b
which are joined at the center to form in effect a downwardly
extending V-shaped portion 23. The substantially vertically
disposed outer edges of the reflector 12 are provided with offset
tabs 24 spaced along the length thereof to engage the upwardly
extending legs 25 of the L-shaped members 22 and flanges 21 to
support the reflector in position on the elements 11 and provide an
enclosed wireway.
The fluorescent lamps 14 are supported within the recesses or coves
formed by the baffles 16 and vertically disposed plates 17 so that
they are completely shielded from direct view. The lamps are held
in position by sockets 26 of conventional configuration and are
interconnected by leads 27 of which one is illustrated in FIG. 3 to
a conventional ballast contained within the housing 13. The ballast
housing 13 includes a hollow rectangular column 28 which may be
secured in any suitable manner to one of the vertically disposed
plates 17 of an element 11 and carries a rectangular enclosure 29
housing the ballast.
The fixture as described is particularly useful with hung ceilings
and may be supported by a plurality of guy wires 30 or other
suitable supports. Furthermore, by reason of the particular
configuration of the lighting fixture in accordance with the
invention the reflector 12 may be arranged with any desired
curvature to provide for either concentrated lighting or general
illumination as may be desired. For general illumination the
reflector would preferably take the configuration as illustrated in
FIG. 2 so that substantially all of the light emanating from the
lamps 14 is reflected downwardly and at the same time distributed
uniformly through a relatively wide angle. If desired, the inner
surfaces of the recesses containing the fluorescent lamps 14 may be
provided with reflective coatings in order to improve the
efficiency of the fixture. Inasmuch as the fixture thus far
described does not include a lens, the lamps 14 can be easily
replaced and the entire fixture may be easily and quickly cleaned
by conventional vacuuming and other cleaning processes.
Furthermore, the elements 11 can be readily extruded of aluminum or
other suitable material and may therefore be formed in any desired
lengths. Since the reflector 12 may be easily formed by suitable
metal-forming machines it can be made of any desired length. In
normal practice, however, the fixtures would be made in 2, 4, 8,
and 16-foot lengths to accommodate standard fluorescent lamps
14.
Referring now to FIG. 4, it will be observed that two or more
fixtures in accordance with the invention may be mounted in
side-by-side relationship in which case the central element 11a
would be utilized between adjoining fixtures. The element 11a is
substantially the equivalent of two elements 11 placed in
back-to-back relationship and comprises a single bottom plate 15a
outwardly extending baffles 16a, a single vertical plate 17a
carrying outwardly extending flanges 21 and L-shaped members 22 as
previously described.
A modified embodiment of the invention is illustrated in FIGS. 5
through 11 and like numerals are used to denote corresponding
elements of the embodiment of the invention shown in these FIGS.
and that illustrated in FIGS. 1 to 3 inclusive. FIG. 5 is a plan
view of two lighting fixtures in accordance with the invention
placed in end-to-end relationship and embodying incandescent lamps
and air-conditioning means. The fixtures are generally denoted by
the numerals 10a and include longitudinal elements 11, incandescent
lighting sources 31, and an air-conditioning duct 32. The ballasts
13 are interconnected with the fluorescent lamps 14 with each
ballast being arranged to operate two fluorescent lamps. The
structural details of each fixture 10a as shown in FIG. 5 is
illustrated more clearly in FIGS. 6 through 11. Referring to these
FIGS., it will be observed that the elements 11 are identical to
the elements 11 illustrated and described in connection with FIGS.
1 to 3. The reflector denoted herein by the numeral 33 has a
configuration similar to that of the reflector 12 except that the
central V-shaped portion generally denoted by the numeral 34 is
provided with louvers for the discharge of air from the insulated
longitudinal conduit or air duct 32. The incandescent light sources
which in the instant embodiment of the invention are in the form of
tubular quartz lamps 35 are positioned within housings generally
denoted by the numeral 36 and one or more of such lamps may be
disposed along the length of each lighting fixture section 10a.
More specifically, each housing 36 is of generally rectangular
configuration having a top wall 37, and sidewalls 38 and 39. The
sidewall 38 extends downwardly and is secured to the side of the
reflector 33. The upper end of the sidewall 38 has an inwardly
extending flange 38' which is riveted to the top wall 37. The
sidewall 39 is integrally formed with the top wall 37 and has a
bottom flange 39' which is riveted to the reflector 33. A louver
assembly generally denoted by the numeral 40 generally conforms
with the shape of the reflector and is secured to a rectangular
opening in the reflector by rivets 41 and 42. Reflectors 43 and 44
are disposed within the housing 36 with the reflector 43 being
riveted to the sidewall 38 and the reflector 44 being secured at
the lower end to the sidewall 39 and upper end to the top wall 37.
The reflectors are spaced one from the other to form a gap 45 and
the sidewall 38 has an opening 46 to provide for the flow of air
through the housing 36. It is evident that any number of
incandescent lamp assemblies 31 may be included on one or both
sides of the lighting fixture to provide the desired amount of
incandescent light.
When the fixture in accordance with the invention is utilized with
air-conditioning means, the reflector 33 is provided with a louver
assembly 34 which is more clearly illustrated in FIGS. 10 and
11.
When the louver assembly 34 is utilized, the reflector 33 may be
formed in two sections 33a and 33b, and the inner ends of the
reflector are bent upwardly to form upwardly extending legs 47 and
48. The air-conditioning duct 32 having insulation 32' about the
outer side thereof has a bottom opening with the edges of the
opening bent downwardly to form legs 49 and 50. The duct 32 is
coupled to the reflector portions 33a and 33b by members 51 and 52.
Each of the members 51 and 52 has a vertical portion 53 riveted to
the adjoining legs 49 and 50, respectively. The lower end of the
vertical portion 53 has a horizontal portion 54, a vertical portion
55 and a second horizontal portion 56. The outer edge of the
horizontal portion 56 carries a first louver 57. The bottom of the
louver assembly comprises an essentially diamond-shaped element 58
which may be formed by extrusion or other suitable means and
louvers 59 and 60 and 61 are spaced between the diamond-shaped
element 58 and the first louver 57. The opposite side of the louver
assembly is formed in the same manner and corresponding elements
are denoted by like numerals. The louvers 59, 60, and 61 and the
diamond-shaped tubular member are secured in position one relative
to the others by end brackets 62.
The flow of air from the duct 32 through the louver assembly 34 is
controlled by slidably disposed dampers generally denoted by the
numerals 63 and 64. Each damper 63 and 64 has a horizontal portion
65 which rests on the horizontal portion 54 of the associated
member 51. The outer edge of the portion 65 has an upwardly formed
flange 66 and each end of the damper carries a downwardly extending
lever 67 secured to a downwardly formed tab 68. The dampers 63 and
64 are held in position by horizontal members 69 which are secured
to the vertical portion 53 of the member 51 and extend inwardly and
terminate in a downwardly formed flange 70. With this arrangement
the dampers can be controlled by the levers 67. FIG. 6 shows one of
the dampers moved inwardly to partially close the opening in the
duct 32 while the other damper is in the open position. It is
evident that the dampers can be adjusted in any desired manner to
affect complete control of the supply of air. A second louver
assembly 71 is disposed between the vertical portions 55 of the
members 51 and rests on the horizontal sections 56. The louver
assembly 71 includes side portions 72 and 73 and spaced transverse
baffles 74. With this arrangement excellent air distribution and
control is obtained and the major elements forming the louver
structure can be extruded to reduce cost of manufacture and
assembly.
As pointed out previously, the fixture in accordance with the
invention is particularly useful in connection with hung ceilings
which are usually supported in spaced relationship from the basic
ceiling structure. A hung ceiling is customarily provided with a
plurality of T-bars which are spaced to support individual ceiling
tiles. FIG. 12 illustrates the coordination of the lighting fixture
in accordance with the invention with conventional T-bar
construction. In this FIG. a longitudinal element 11 is illustrated
and is provided with slots 75 at spaced intervals to accommodate
and interlock with T-bars 76. Each T-bar is provided with an
outwardly extending tab 77 which is inserted in a cooperating slot
75 and then bent at right angles to hold the T-bar in position with
the longitudinal fixture element 11. In this way fixtures in
accordance with the invention can be supported from the basic
ceiling C, as shown in FIG. 6, and then the T-bars 76 can be
installed and supported from the ceiling C. Thereupon the ceiling
tiles 20, as viewed in FIG. 2, can merely be placed in position to
complete the ceiling.
While only certain embodiments of the invention have been
illustrated and described, it is apparent that alterations,
modifications, and changes may be made without departing from the
basic concepts of this invention.
* * * * *