Lighting device

Details Lighting device Lighting device

1999-08-11

2001-05-08

O'Shea, Sandra (Department: 2875)

Illumination

Self powered lamp

Cylindrical flashlight casing

C362S202000, C362S204000, C362S304000, C362S306000

Reexamination Certificate

active

06227678

ABSTRACT:

The present invention relates to a lighting device which incorporates a reliable contact for a battery cell contained therein.
SUMMARY OF THE INVENTION
According to the invention, there is provided a lighting device comprising comprising a body having a compartment for containing a battery cell, a light source supported by the body for energization by the battery cell, a switch provided on the body for controlling the energization of the light source, and at least one contact unit provided at one end of the compartment for making contact with the battery cell co-axially, said contact unit comprising a co-axial conductive coil spring having an end, a conductive end piece provided at the spring end for contacting the battery cell, and a stationary holder for maintaining the spring substantially straight.
Preferably, the end piece is in the form of an end cap covering the spring end.
In a preferred embodiment, the holder is arranged also to retain the end piece on the spring end.
More preferably, the holder has a hole through which the end piece extends, and the end piece is in the form of an end cap covering the spring end and having a peripheral flange engaged behind the hole for retaining by the holder.
It is preferred that the spring is a helical coil spring.
Advantageously, the compartment has two opposite ends, at each of which a said contact unit is provided.
More advantageously, the light source is provided at one end of the compartment for connection to the battery cell by means of the respective contact unit, said contact unit including a similar end piece provided at the opposite end of the associated spring for contact with the light source.
The lighting device preferably includes a conductive strip which is provided between the light source and the switch and is positioned by means of a bracket covering a free end of the strip.
More preferably, the other end of the strip is connected to the switch and its intermediate portion is exposed for connection to the light source.
The aforesaid lighting device may be in the form of a flashlight.


REFERENCES:
patent: 5457609 (1995-10-01), Bhanot et al.
patent: 5678921 (1997-10-01), Kish et al.

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