Lamp holder for low-wattage-lighting systems

Details Lamp holder for low-wattage-lighting systems Lamp holder for low-wattage-lighting systems

1998-11-20

2001-06-05

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

With envelope

Having base and connector

C313S318090, C313S318100

Reexamination Certificate

active

06242853

ABSTRACT:

The present invention relates to the field of—mainly low-voltage—lighting systems, and in particular to the manner in which a lamp is attached to a luminaire.
The means with which a lamp is conductively fitted in a luminaire is ordinarily termed a lamp holder. The construction of such a lamp holder depends on the fitting means that are provided on a lamp for that purpose. In any case, there must be two electric conductors which are separately fixed in the lamp holder.
Usually, the body of the lamp holder is formed by the insulator. In addition, the lamp holder must contain fitting means to permit the lamp to be fitted in the lamp holder, so that the electric conductors of the lamp contact the electric conductors of the lamp holder. Examples of means by which lamps are fixed are an edison screw, a bayonet cap and a pinandsocket connection, locked with a spring or a screw, such as the generally available ceramic lamp holders with so-called GX 5.3 bases.
The problem with these commercially available lamp holders is that they, in their turn, must be fitted in the luminaire, and that for the power supply from the luminaire they offer no alternative but copper wire or an other conductor of similar diameter. With specially produced lamp holders this problem is solved by integrating the lamp holder with the luminaire as an external part thereof.
Advantages of such special lamp holders are that they permit the power supply to the lamp not to run in the same direction (for instance, perpendicular to the path of the current in the lamp), and that they can be made of the same material as the luminaire, which facilitates finishing treatments, such as surface treatments, as for instance coloration. However, a problem with such lamp holders is the separation of the two live parts of the lamp holders. In fact, this should be done in such a manner that a number of international standards are complied with (see for instance IEC 598). It is the required heat resistance, in particular, which presents problems, because the insulator that is usually placed between the conducting parts mostly also serves for fixing the two parts together, in which case the insulator and the conducting parts must have identical coefficients of expansion to prevent them falling apart. This aspect is also of importance when the luminaire is coloured by means of powder coating (in which heating is involved), which neutralizes the above-mentioned advantage (the same material).
The present invention solves these problems by providing one conductor of the lamp holder enclosed in the other, so that all the above-mentioned advantages are retained.
Advantages of the invention are the following:
Fixing the two conducting parts together can be done without making use of fixing and/or locking materials;
The lamp holder does not present problems connected with the coefficient of expansion of the insulator being different from that of the other material of the lamp holder;
The lamp holder can be made of the same material as the luminaire;
The lamp holder itself can form an external part of the luminaire;
The lamp holder permits the lamp to be fitted perpendicular to the luminaire; instead of in line with it;
Production of the lamp holder is simple, as it has only three main parts, and these are also the conductors;
The lamp holder can be used for luminaires of which the body itself is one of the conductors, and can be rotatably fixed on such luminaires;
The lamp holder permits all the conductors to be firmly connected, which is very important for low-voltage systems;
The lamp holder complies with the international legal requirements in this area (SELV), inter alia with those governing the distance between conductors, whilst the insulator can still be thinner than that distance, because the two parts of the lamp holder have bevelled edges and need not be insulated from each other but through the insulator and the distance provided by the bevelled edge.


REFERENCES:
patent: 2101277 (1937-12-01), Wappler
patent: 5676454 (1997-10-01), De'Armond Jr.
patent: 8710787 (1988-01-01), None
patent: 4310440 (1994-02-01), None

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