Lampholder

Details Lampholder Lampholder

2001-05-30

2003-04-15

Luebke, Renee (Department: 2833)

Electrical connectors

With coupling movement-actuating means or retaining means in...

Including movement of coupling part about axis

C439S086000, C439S226000

Reexamination Certificate

active

06547582

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lampholder.
2. Description of the Related Art
As shown in
FIG. 9
, a conventional lampholder includes a body
47
, a female screw shell
48
, a central contact spring
49
, a cover
50
, power terminal boards
52
a,
52
b,
and lead wires
53
a,
53
b.
The body
47
is made of insulating resin or ceramic and is in the form of a cylinder with the bottom. The female screw shell
48
is made of metal and connected electrically to a shell (not shown), e.g., of an E-type cap (not shown) for a lamp (not shown). Similarly, the central contact spring
49
is made of metal and connected electrically to an eyelet (not shown) of the cap. The cover
50
is made of insulating resin or ceramic and provided at the end of the body
47
. The power terminal boards
52
a,
52
b
are fastened on the inner surface of the cover
50
with a pair of screws
51
(one of them is not shown). The lead wires
53
a,
53
b
are connected electrically to the power terminal boards
52
a,
52
b.
The body
47
and the cover
50
are connected mechanically with two screws
54
a,
54
b.
One screw
54
a
mechanically connects the body
47
and the female screw shell
48
, and also electrically connects the female screw shell
48
and the power terminal board
52
a.
The other screw
54
b
mechanically connects the body
47
and the central contact spring
49
, and also electrically connects the central contact spring
49
and the power terminal board
52
b.
A screw
55
is used to adjust the amount of movement of the central contact spring
49
when the cap is inserted. The screw
55
prevents the contact failure between the central contact spring
49
and the eyelet resulting from unnecessary movement of the central contact spring
49
toward the cover
50
.
However, in the conventional lampholder, many screws or the like are necessary to fasten each part together, particularly, to fasten the component of resin or ceramic, such as the body
47
, and that of metal, such as the female screw shell
48
. This requires the steps of tightening those screws as well. In other words, the parts are increased and the process is complicated, which in turn increases the cost and reduces the productivity.
SUMMARY OF THE INVENTION
Therefore, with the foregoing in mind, it is an object of the present invention to provide a lampholder that can achieve the reduction of cost and the improvement of productivity by reducing the parts and simplifying the process.
A lampholder of the present invention for receiving a lamp cap includes a body, a receiving portion provided in the body and to be connected to the cap, and a lead wire connected to the receiving portion. The receiving portion is made of conductive resin.
Unlike a conventional lampholder, this configuration eliminates the need to fasten the component of resin or ceramic, such as a body, and that of metal, such as a female screw shell, together. Therefore, many screws or the like are not necessary. As a result, the parts can be reduced and the steps of tightening the screws or the like can be omitted. Thus, the reduction of cost as well as the improvement of productivity can be achieved.
These and other advantages of the present invention will become apparent to those skilled in the art upon reading and understanding the following detailed description with reference to the accompanying figures.


REFERENCES:
patent: 4934951 (1990-06-01), Schonath
patent: 5124897 (1992-06-01), Kraus
patent: 5228766 (1993-07-01), Makita et al.
patent: 5569044 (1996-10-01), Huang

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