Patent Grant
7374457
This invention relates to lighting systems and more particularly to such systems where the light source employs a ballast. Such systems include, for example, fluorescent lighting.
The fluorescent lighting used in many office buildings and similar structures usually comprises long (for example, four to eight feet in length, fixtures that mount one or more fluorescent tubes. Because the lamps operate from a gaseous discharge, a ballast is required. The ballast provides circuitry that controls the electrical current through the lamp during its startup and subsequent operation. For many years it has been the practice to “hardwire” the ballast into the system. Thus, while it is possible to replace a lamp or lamps without shutting off the main power supply, because the ballasts were hardwired into the system replacement necessitated deactivating the complete power supply, usually at the mains, which causes a good deal of unnecessary disruption.
It is, therefore, an object of the invention, to obviate the disadvantages of the prior art.
It is another object of the invention to enhance ballast replacement.
These objects are accomplished, in one aspect of the invention, in a lighting system that includes a fixture with an axis of orientation; a light source mounted within the fixture, at least a portion of the light source extending along the axis of orientation; a ballast associated with the light source, the ballast having a first end attached to the light source and a second end attached to an electrical power source: the improvement comprising: the second end attachment comprising a connector composed of inline, electrical connector halves having proximal mating ends, an axis of attachment and distal ends provided with strain relief mounting. This system allows an individual ballast to be removed safely, without disrupting the remainder of the system.
For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following disclosure and appended claims taken in conjunction with the above-described drawings.
Referring now to the drawings with greater particularity, there is shown in
The light source in this instance is shown as being a linear fluorescent tube. While U-shaped lamps are known, at least a portion 18 of the light source 16 extends along the axis of orientation. A ballast 20, usually positioned on the side of the fixture away from the light source, is associated with the light source 16, the ballast 20 having a first end 22 attached to the light source 16 via appropriate wires and a second end 24 attached to an electrical power source 26, also by appropriate wires.
At least some of the objects of the invention are achieved by interposing a connector 28 between the second end 24 of the ballast 20 and the power source 26.
The connector 28 is composed of inline electrical connector halves 30, 32 having proximal mating ends 34, 36, an axis of attachment 38 and distal ends 40, 42 provided with strain relief mounting means 44.
One of the electrical connector halves, for example, 30, has a locking tongue 46 extending along the axis of attachment 38 and the other half, 32 in this instance, has a locking tongue receptor 48 for receiving the locking tongue 46, the tongue and receptor functioning to maintain the connector halves in a joined and locked position. Of course, the positions of the locking tongue and receptor can be reversed, if desired.
The strain relief mounting means 44 formed on the distal ends comprises a projection 50 extending along the axis of attachment 38 and a plurality of spaced apart, transverse nubs 52 positioned on the projection 50.
Each of the electrical connector halves 30, 32 contains first and second electrical contacts 30a, 30b and 32a, 32b respectively, having mating ends 30c, 30d and 32c, 32d respectively and wire fixing ends 54a, 54b, and 56a, 56b. The contacts comprise the usual male-female portions and it is not material to this invention which connector half contains which contact. First and second pairs of wires 60, 62 and 64, 66 are connected, respectively, to the wire fixing ends 54a, 54b and 56a, 56b, the first and second pairs of wires 60, 62 and 64, 66 being wound about the transverse nubs 52 to provide strain relief.
In a preferred embodiment of the invention, the wires criss-cross in an X pattern as shown in
Other configurations are of course possible, so long as the strain relief provided is sufficient to prevent the pulling force applied to the wires from propagating to the wire terminals inserted in the connector body and, as a result, degrading or breaking the electrical and/or mechanical connections between the wires and the terminals and thus exposing the operator to line voltage.
While there have been shown and described what are at present considered to be the preferred embodiment of the invention, it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the scope of the invention as defined by the appended claims.
| Number | Name | Date | Kind |
|---|---|---|---|
| 6659622 | Katogi et al. | Dec 2003 | B2 |
| 6969179 | Sloan et al. | Nov 2005 | B2 |
| 6984055 | McCarthy et al. | Jan 2006 | B2 |
| 7055982 | Yaphe et al. | Jun 2006 | B2 |
| 7144129 | Mackin | Dec 2006 | B2 |
| 7293895 | Grossman et al. | Nov 2007 | B2 |
