Auxiliary light device for a key

1. An auxiliary light device for a key comprising a base, a lighting element, two batteries and a casing assembly; wherein:

the base is a block whose base is to be fixed permanently on a gripping portion of a key, in a center-left and a center-right portions of the base is formed a battery chamber, respectively, in a front portion of the base is defined a notch facing a shaft of the key, the notch is connected to the battery chambers via a groove, in a rear portion of the base is formed a threaded hole;

the lighting element has a bulb inserted in the notch of the base, two conductive terminals of the lighting element are engaged in the groove of the base and extended into the chambers;

the two batteries are disposed in the chambers of the base and connected to the two conductive terminals, respectively, in such a manner that a positive electrode of one battery faces downward and a negative electrode of another battery faces downward; and

the casing assembly serves to cover the abovementioned components and includes a cover, a button and a partition, the cover is detachably mounted on the base and is formed at a front sidewall thereof with a gap to be aligned with the notch of the base, in a rear sidewall of the cover is formed a through hole be aligned with the threaded hole of the base, so as to allow a screw to be screwed in the threaded hole via the through hole, in the top surface of the cover is formed an aperture located between the two batteries, the button is a metal member to be installed in the cover in a bottom-up fashion, the button is big enough to straddle the two batteries, the partition is made of flexible isolation material, and a top surface of the partition is attached to an inner top surface of the cover, and in the partition is formed a hole being located correspondingly to the batteries and the button.

2. The auxiliary light device for a key as claimed in claim 1 , wherein the lighting element is a mini light emitting diode, and a flange at a rear end of the bulb abuts against an inner wall of the notch, thus preventing disengagement of the lighting element out of the notch.

3. The auxiliary light device for a key as claimed in claim 1 , wherein a central protrusion of the button partially protrudes out of the aperture of the cover.

4. The auxiliary light device for a key as claimed in claim 1 , wherein the partition serves to separate the button from the batteries.

5. The auxiliary light device for a key as claimed in claim 1 , wherein the hole of the partition is an elongated rectangular hole, a length of the rectangular hole is larger than a diameter of the button, so that the button is pressed can contact the two batteries when it is pressed, and a width of the rectangular hole is less than the diameter of the button, so that, when the button is not pressed, the button will be kept staying above the partition without touching the batteries.