The present invention relates to recessed lighting fixtures for installation within a ceiling or other surface in a structure.
Recessed lighting fixtures are widely used in residential construction as well as commercial, industrial and other building structures. A recessed lighting fixture may hold a variety of light emitters such as an incandescent, compact fluorescent or, in a more recent trend, light emitting diode (“LED”) lighting element. A typical recessed lighting fixture comprises a housing or “can” (these terms are used interchangeably herein) which when installed is recessed within a surface such as drywall, panelling or other external sheathing. The housing encloses electrical elements and a light source such as a light bulb. In most cases, a decorative ring-shaped cover is secured to the housing to cover the gap between the wallboard or other surface and the edge of the housing, so as to provide an attractive finished appearance. Optionally, the light emitter may be covered with a clear or translucent lens so as to diffuse the light. In most cases, the housing portion of the fixture is wholly recessed within the surface and is not visible after installation.
Electrical fixtures normally include electrical leads that connect the electrical components of the fixture to the household wiring. For safety reasons, the fixture leads are normally connected to the household wiring outside the fixture housing, within an electrical junction box that is separately mounted to the structure. The junction box normally consists of an enclosure that receives a multi-phase household power cable consisting of bundled individual wires. The individual wires of the household cable are separated within the junction box and are individually connected within the junction box to corresponding electrical leads from the fixture. The junction box normally provides a measure of insulation from heat generated by the fixture. A junction box of this type is routinely installed for use with most electrical connections in a structure such as light fixtures, outlets, fans, etc.
Several types of conventional recessed lighting fixtures exist to meet various requirements. For example, for new construction the can normally comprises a relatively large housing, typically cylindrical, which houses an insert for a bulb or other light source. The housing fixture is typically sized to dissipate heat generated by the light source, which in the case of a conventional incandescent bulb can be considerable. A new construction can is typically installed by bracing the housing to one or more ceiling beams or other structural elements. Electrical wires enter the housing from the junction box, which is separately installed to the structure adjacent to the housing.
The can may be uninsulated or insulated, depending on location of the fixture installation, building code requirements and other factors.
Another type of prior art fixture is intended for installation in pre-existing structures, for example for installation in a renovation. This type of fixture may be smaller and may be mounted directly to drywall or other sheathing, rather than to underlying structural elements. Normally, such fixtures still require the use of a separate junction box.
The separate installations of a junction box and a conventional recessed lighting housing is typically time consuming and can add significantly to the overall cost of a new construction. Both of these steps usually must be performed by a licensed electrician, which can be costly and can result in construction delays, scheduling issues and other drawbacks. Furthermore, the existence of multiple types of cans for different applications is a drawback in that this increases inventory costs for suppliers and installers and also makes it more difficult for homeowners and other non-professional electricians to install a lighting fixture.
Low wattage LEDs can be used as a light source without generating significant amounts of heat that requires dissipation. This has opened up the possibility of redesigning lighting fixtures to take advantage of the relatively low heat discharge of modern light emitters of this type. There is a need for improved recessed lighting fixtures that take advantage of the reduced heat loads generated by LED and other low-energy light emitters and which provide simplified lighting solutions.
The present invention is based in part on the unexpected discovery by the inventors that a lighting fixture having the elements described herein may integrate the functions of a junction box and a lighting fixture housing. Furthermore, when the assembly is adapted for use with a low-energy emitter such as an LED light source, the housing may be mounted directly to wallboard or other sheathing material, thereby dispensing with the need for mounting the assembly to an underlying beam or stud. Such an assembly may be quickly and easily installed, in some cases without requiring the skills of a licensed electrician.
According to one aspect, the invention relates to a recessed lighting assembly for mounting to a structure, such as a wall or ceiling of a house, building, etc. In this aspect, the assembly includes an integrated junction box and housing having a fastener to secure the housing to the structure and an inlet to admit a multi-phase electrical cable into the housing. The electrical cable typically comprises “source” wiring that is directly connected to an electrical panel or other major distribution point. Electrical connections between the source wiring and the fixture leads may occur within the integrated junction box/housing of the lighting assembly. According to this aspect, the assembly comprises:
The insert may include a heat sink configured to absorb and dissipate heat generated by the electric circuit and/or the light emitter. The heat sink may form an exterior portion of the insert which is outside the junction/housing.
The connector may consist of one or more quick connect members which are configured to connect the electrical wires to the insert. According to one aspect, the quick connect member has a first component for electrical connection to an exposed end of the wire and a second component electrically connected to the electrical components of the insert wherein the first and second components form an electrical and a mechanical connection therebetween to transmit current from the electrical wires to the electrical components of the insert. The second component of the quick connect member may be mounted to the insert. According to a further aspect, the quick connect member may comprise an integral member wherein the first component comprises a socket within the quick connect member for receiving and engaging an exposed wire core of the household wires. The second component may comprise an additional socket within the member for receiving electrical leads from the insert. Alternatively, the first and second components may be separable from each other, such that the quick connect member comprises a receptacle for receiving a first of the wires and the first and second components comprises engagement members for fastening the components together for forming an electrical and mechanical connection therebetween. A support member may be mounted to the insert wherein at least the first of the components of the quick connect members are mounted to the support member.
The assembly may further include one or more fasteners for mounting the junction box/housing to the structure, for example to wallboard or other sheathing member of the structure. The fastener may comprise at least one set of opposing clamp members configured to clamp the sheathing member between the clamp members. A first of the clamp members may comprise a spring clip extending from the housing biased to move outwardly from the housing and a second of the clamp members may comprise a non-moveable protrusion of the housing, wherein the spring clip is configured to bear against an inside surface of the sheathing and the protrusion is configured to bear against an opposed outer surface of the sheathing.
According to a further aspect, the insert and the junction box/housing comprise interlocking members to fasten the insert to the junction box/housing. The interlocking members may comprise at least one protrusion extending from the junction box/housing or the insert and a slot within the other of the junction box/housing or insert wherein the slot is configured to receive the protrusion and is further configured as a cam to tighten the insert into the junction box/housing when the insert is rotated relative to the junction box/housing.
The junction box/housing may be configured for installation either during construction of the structure or retrofit into an existing structure.
According to a further aspect, the junction box/housing may comprise an uninsulated can that is configured for mounting directly to wallboard or other sheathing without being separately mounted to underlying structural members of the structure. A housing of this type is conventionally referred to as a “mini-can” due to its small size relative to a can intended to be directly secured to structural members of a structure.
According to another aspect, the invention relates to a method of installing a light fixture to a structure, wherein the fixture comprises an integrated junction box/housing and an insert comprising a light emitter or mount for a light emitter, electrical components for supplying current to the light emitter, a connection for connecting the electrical components to electrical wires within the junction box/housing and an exterior portion which is exposed when the assembly is mounted to the surface. The method comprises the steps of:
The physical components associated with the present method may comprise the assembly described herein.
Directional references used in this description are purely for convenience of description and generally refer to the assembly in a conventional ceiling mount. However, it will be understood that the invention may be oriented in any direction. Furthermore, any specific dimensions, construction materials and the like are provided herein merely by way of example and are not intended to limit the scope of the invention.
Housing 12, which may also be referred to as a “can”, is seen in particular detail in
Housing 12 comprises a cylindrical sidewall 20 which defines an interior space and a downwardly-facing open end 22. The opposed end of housing 12 is closed with cover plate 24 and faces upwardly when installed in a ceiling mount. Housing 12 may be fabricated from metal or other rigid material that is suitable for use as a permanently-installed electrical fixture. Housing 12 further comprises an annular flange 26 that protrudes outwardly from sidewall 20 adjacent to first end 22. Cover plate 24 comprises an opening 28, partially covered with a flexible insert 30 which secures a conventional three phase household electrical cable 100 (seen in
Housing 12 may be installed in a structure in a new construction or a retrofit/renovation of an existing structure. Housing 12 may also be installed in applications that may conventionally require either one of an insulated or uninsulated can, in particular when used with a lower power LED light emitter as described herein which generates substantially less heat during use than a conventional incandescent light bulb. It will be further seen that housing 12 may be installed in any suitable surface such as a ceiling, wall, or other surface suitable for installation of a recessed lighting fixture.
As described below, housing 12 can be securely fastened to sheathing no of a wall, ceiling or other surface of a structure by a suitable fastening means. In the present embodiment, housing 12 is not required to be installed to an underlying structural element such as a stud or beam, but can be sufficiently secured by engagement with the wallboard or other sheathing material that forms an exposed surface of the structure, using grippers 32 that are resiliently biased to secure the housing within an opening in wall board or other sheathing. Grippers 32 serve to grip the sheathing by clamping the sheathing between flange 26 and a pair of opposed spring-biased sheathing grips 32 that protrude outwardly from wall 20 of housing 12.
Sheathing grippers 32, seen in detail in
Electric current is delivered to fixture 10 via a conventional three phase electrical cable 100 which delivers household current to assembly 10 (see
After cable 100 has been inserted into housing 12, housing 12 may be installed within a surface of the structure, as seen in
If it is necessary to remove fixture 10, this may accomplished by drawing together arms 38 from within the interior of housing 20 to release housing 12 and allow it to be removed for maintenance, replacement, etc.
Housing 12 is configured and fabricated to comply with normal regulatory requirements for an electrical junction box, whereby housing 12 may itself provide the function of a junction box as well as serving as the housing for a light emitter. As such, a free end of multiphase electrical cable 100 may be directly fed into the interior of housing 12 without the need for a separate junction box interposed between main cable 100 and leads from the electrical elements of assembly 10.
FIGS. 3 and 9-13 illustrate LED insert 18. Insert 18 comprises an essentially cylindrical body 19 configured to fit within the interior of housing 12 and interlock therewith. Body 19 comprises a rigid structure which may be fabricated from cast aluminum, moulded plastic or other suitable material. Body 19 releasably locks into housing 12 by means of cooperating members on the housing and body respectively that interlock with each other. The cooperating members include at least one and preferably two protrusions 41 located on opposing sides of housing 12 which protrude into the interior thereof from the inside surface of sidewall 20, as seen in
It will be seen that the relative positions of protrusions 40 of housing 12 and grooves 44 within insert 18 may be reversed.
When installed within housing 12, body 19 fills a top portion of the interior space of housing 12. An unfilled space between body 19 and cover plate 24 accommodates elements such as cable 100, wires 31a-c and quick connect members 52a-c and 53a-c, as described below.
The interior of body 19 comprises electronic elements, not shown, for supplying current to LED light emitters. The electronic components may comprise any such components known to the art for supplying current to a selected light emitter, including associated mechanical components, and may comprise an electrical/electronic circuit and other elements.
Body 19 comprises a substantially flat upper surface 54 which faces into the interior of housing 12 when installed thereto. As seen in
Alternatively, as seen in
In order to ensure that the respective quick connects are installed properly, they are all color coded to match the standard wire color coding of a three phase wire, for example white, green and black.
Connection of insert 18 to household wiring thus comprises the initial step of feeding cable 100 through opening 28 of housing 12. Normally, this step is performed prior to installation of housing 12 within the sheathing. The exposed end of cable 100 is then separated into wires 31a-c and these individual wires are then connected to corresponding quick connect members 53a-c or 70a-c. This step normally requires inserting exposed cores of wires 31a-c into corresponding sockets within the respective quick connects 53a-c or 70a-c, which electrically and mechanically connects the wires with corresponding quick connect members. In the case of quick connects 52/53, this step is followed by connecting quick connects 53a-c with corresponding quick connect members 52a-c on insert 18. For this purpose, the quick connect members are appropriately labelled and wires 31a-c are colour-coded for connection with the corresponding household wires. After the above electrical connections have been formed, insert 18 may be secured within housing 12. Alternatively, in case of quick connects 70a-c, no further connection steps are required after inserting wires 31 into corresponding sockets 72.
As seen in
Cover plate 14 is mounted to or is integral with body 19 and comprises, in this embodiment, a generally disc-shaped plate having a finished outer surface that is exposed when fixture 12 is installed. A rim 56 of plate 14 contacts sheathing 110 when assembly 10 is installed. The opposing outer face 58 of plate 14 is exposed when installed and is provided with a finished, decorative appearance. For example, outer face 58 may comprise a radially sloping surface which is configured to generally merge with a wall or ceiling panel when installed. As seen in
It will be seen that the invention is not limited to use with an LED light element but may comprise any suitable light element known to the art which can be adapted for use with the present invention.
Insert 18 is covered by a decorative translucent or transparent lens 16, as seen in
Turning to
Insert 118, shown in
Can 102 may be installed within a structure by cutting a circular opening in the wallboard or sheathing of a wall, ceiling or other surface. Household wires located within the interior of the wall are fed through one of openings 128a and/or 128b, depending on the location of the wires. In some cases, a ground wire may be fed separately through one of the openings 128, and the current wires are fed through the other of openings 128. The household wires are separated into individual ground, positive and negative wires and the sheathings are stripped to reveal the wire cores. The wire cores are then inserted into respective ones of sockets 153a-c of quick connects 152a-c to form electrical connections with the electrical components of insert 118.
After insert 118 has been electrically connected to the household wire, it may be fastened to can 102, in the same fashion as the embodiment of
The scope of the invention should not be limited by the preferred embodiments set forth in the examples, but should be given the broadest interpretation consistent with the description as a whole. The claims are not to be limited to the preferred or exemplified embodiments of the invention.
This application claims priority from U.S. Patent Application No. 61/881,162, filed on Sep. 23, 2013, the contents of which are incorporated herein by reference in their entirety.
Number | Date | Country | |
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61881162 | Sep 2013 | US |