Inductor devices – With supporting and/or spacing means between coil and core – Preformed insulation between coil and core
Reexamination Certificate
2002-07-18
2004-02-24
Nguyen, Tuyen T. (Department: 2832)
Inductor devices
With supporting and/or spacing means between coil and core
Preformed insulation between coil and core
C336S107000, C336S192000
Reexamination Certificate
active
06696908
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a coil bobbin for a transformer used, for example, in a large AV amplifier which is recently more used with the spread of DVD, more particularly, to a coil bobbin provided with a separate terminal board.
2. Description of the Related Art
A coil bobbin of this type is known as disclosed in Japanese Utility Model Application No. 56-118376 wherein a coil bobbin and a terminal board are separately formed, and the terminal board is mounted on a flange of the coil bobbin during assembly.
FIG. 13
is a perspective view of a flange portion of a coil bobbin
30
and a terminal board
31
to be mounted on the flange portion of the above described conventional example.
In this conventional example, through holes
33
for mounting the terminal board are formed at both ends of a terminal board mounting portion which is formed at an end of an upper flange
32
of the coil bobbin
30
. Long arms
35
for mounting are formed at both ends of a lower surface of the terminal board
31
in which terminals
34
are implanted, and hooks
36
are formed on outsides of tips of the arms
35
.
When the terminal board
31
is mounted on the terminal board mounting portion of the upper flange
32
of the coil bobbin
30
, the arms
35
formed with the hooks
36
at their tips are inserted in the through holes
33
in the upper flange
32
so that the hooks
36
reach a lower side of the upper flange
32
. The hooks
36
prevent the terminal board
31
from coming off and fix the terminal board
31
to the terminal board mounting portion of the upper flange
32
.
The coil bobbin
30
of the conventional example has a problem that spaces where the through holes
33
for mounting the terminal board
31
are formed must be secured at both sides of the upper flange
32
, thus leading to an increase in an outer dimension.
Further, there is a problem that the long arms
35
formed from molding on the terminal board
31
are apt to splinter.
BRIEF SUMMARY OF THE INVENTION
The present invention is achieved in view of the above and has its object to provide a coil bobbin for a transformer wherein no through hole is formed in both sides of an upper flange to thereby prevent upsizing, no long arm apt to splinter is formed on a terminal board, the terminal board can be readily mounted to the flange, and even when the terminal board formed from the molding warps, the warp can be corrected by the mounting.
The present invention attains the above described object according to a configuration of a coil bobbin in which an end of an upper flange
3
,
3
A,
3
B formed on an upper end of a drum
2
,
2
A,
2
B is formed with a terminal board mounting portion
5
,
5
A,
5
B, and in which a separately formed terminal board
8
,
8
A,
8
B is mountable on the terminal board mounting portion
5
,
5
A,
5
B, wherein an inside of the terminal board mounting portion
5
,
5
A,
5
B is formed with a rib
7
, whose upper portion is formed with a plurality of plate-like walls, and an inner end of the terminal board
8
,
8
A,
8
B is formed with a plurality of through holes
17
in which the walls are inserted.
Another feature of the present invention is that an inner surface of the terminal board
8
,
8
A,
8
B is formed with a projection
14
for engagement, and that the above described wall is formed with a through hole
9
a
or recess
9
b
to be engaged with the projection
14
.
Still another feature of the present invention is that an inner end of the terminal board
8
,
8
A,
8
B is formed with outer clipping tabs
16
placed on an outside of the rib
7
and a concavity
13
placed on an inside of the rib
7
, such that the rib
7
is clipped between the outer clipping tabs
16
and the concavity
13
.
Yet another feature of the present invention is that the inner end of the terminal board
8
,
8
A,
8
B is formed with the outer clipping tabs
16
placed on the outside of the rib
7
, the concavity
13
placed on the inside of the rib
7
, and also formed with inner clipping tabs
15
, and that the rib
7
is clipped therebetween.
Further feature of the present invention is that at least two reinforcing ribs
18
,
18
A are formed on an upper surface of the terminal board mounting portion
5
.
REFERENCES:
patent: 5200731 (1993-04-01), Tochio et al.
patent: 3446040 (1986-06-01), None
patent: S58-25012 (1983-02-01), None
patent: S60-172327 (1985-11-01), None
patent: S61-81111 (1986-05-01), None
patent: 61-172318 (1986-08-01), None
Aikawa Atsushi
Haga Yuji
Okano Kohei
LaPointe Dennis G.
Mason Law, P.A.
Nguyen Tuyen T.
Tamura Corporation
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