Vehicle light bulb

Details Vehicle light bulb Vehicle light bulb

2001-08-28

2002-12-24

Bradley, P. Austin (Department: 2833)

Electrical connectors

With vitreous-type envelope

Having only two duplicate contacts arranged bilaterally...

C439S699200, C313S318070

Reexamination Certificate

active

06497590

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to a vehicle light bulb applied to automobiles and other types of vehicles.
2. Related Art
With reference to
FIG. 5
, a conventional automobile light bulb comprises a glass bulb (
40
) and a base (
41
) that securely receives the glass bulb (
40
) therein. Two filaments (
42
,
42
′) each connected between two respective conducting legs (
43
a
,
43
b
,
43
c
,
43
d
) are provided in the glass bulb (
40
), wherein each conducting leg (
43
a
,
43
b
,
43
c
,
43
d
) has a wire (not shown) that extends into the base (
41
). Usually, the wires extending from the conducting legs (
43
a
,
43
c
) are connected together to form a common wire. When the glass bulb (
40
) is adhered to the base, the common wire is disposed to electrically connect with the inner wall of the base (
41
), wherein the base (
41
) is made of conductive material and is used as one electrode, such as a cathode. Other wires, which extend from the conducting legs (
43
b
,
43
d
), are electrically connected to a conductive point (
44
) formed on the bottom of the base (
41
), wherein the conductive point (
44
) is used as the other electrode, such as an anode.
When the conventional automobile light bulb is being installed in a socket of a signal light, such as a brake light or a turn signal, the base (
41
) and the conductive point (
44
) are respectively and electrically connected to the cathode and anode of the socket. Thus the automobile light bulb is activated when the socket is provided with power.
However, such a structure of the conventional light bulb has some defects that need to be overcome. When the glass bulb (
40
) is adhered with the base (
41
) by using viscose, one essential point is that the common wire must be electrically connected with the base (
41
) well, if not, the light bulb will not light up.
Another defect appears at the time when the conventional light bulb is being installed in the socket. With reference to
FIG. 5
, two stubs (
45
) are further symmetrically formed on an outer periphery of the base (
41
). The installation of the light bulb into the socket is as follows. The glass bulb (
40
) is gripped by a user and the base (
41
) is pushed into the socket, whereafter the glass bulb (
40
) is rotated so as to find a proper position whereby the two stubs (
45
) are able to engage with the corresponding mechanism in the socket.
Since the connection between the glass bulb (
40
) and the base (
45
) is only achieved by the viscose, once the light bulb has been installed and detached from the socket several times, the glass bulb (
40
) and the base (
45
) may separate due to the torque between the bulb and the base. An even worse situation is that once the light bulb is damaged and needs to be replaced with a new one, the separated base (
44
) may possibly still remain in the socket and be very hard to take out, thus the replacement of the light bulb becomes very difficult.
Therefore, the present invention provides a vehicle light bulb to mitigate and/or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
The main objective of the invention is to provide a vehicle light bulb that is convenient to install in or detach from a socket of a signal light in a vehicle.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 4603278 (1986-07-01), Devir et al.
patent: 5531613 (1996-07-01), Takano et al.
patent: 6083050 (2000-07-01), Hsu

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