Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Reexamination Certificate
2002-09-27
2003-10-14
Enad, Elvin (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
C335S078000
Reexamination Certificate
active
06633214
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to an electromagnetic relay, and more particularly to a compact electromagnetic relay that is mounted on a circuit board.
BACKGROUND OF THE INVENTION
In the prior art, Japanese Patent Application Kokoku No. H4-42766 describes a conventional electromagnetic relay, which is shown in FIG.
7
.
The electromagnetic relay comprises an insulating base housing
110
, a contact part
120
, an operating electromagnet
130
and a case
140
.
The base housing
110
is formed with wall members
115
and
116
protruding on both ends of a substantially rectangular body that extends in a longitudinal direction, and includes insertion holes
111
and
112
formed in the front sides of the respective wall members
115
and
116
(toward the front in FIG.
5
). Insertion parts
131
a
(only one insertion part
131
a
is shown in
FIG. 5
) on a gate-form iron core
131
are each press-fitted into a respective one of the insertion holes
111
,
112
. A circular receiving hole
113
is formed in close proximity to a corner of the insertion hole
111
on the side of the wall member
115
and receives a leg
133
d
of an armature
133
. In addition, a receiving groove
114
is formed in close proximity to a corner of the insertion hole
112
on the side of the wall member
116
and receives a protrusion
133
f
of the armature
133
and regulates the pivoting range of the armature
133
. A pair of through-holes
117
are formed in the wall member
116
and allow the passage of coil terminals
135
.
The contact part
120
comprises a fixed contact
121
and a movable contact
123
. The fixed contact
121
and movable contact
123
have a fixed contact point
122
and a movable contact point
124
, respectively, on facing surfaces, and have board connecting portions (not shown) that are connected to a circuit board (not shown). The fixed contact
121
and movable contact
123
are formed by stamping and forming copper alloy plates consisting of phosphorus bronze, etc. The fixed contact
121
and movable contact
123
are fastened to the wall member
115
of the base housing
110
so that they are arranged beneath the excitation coil
134
and between the two legs
131
b
of the gate-form iron core
131
.
The operating electromagnet
130
comprises a gate-form iron core
131
, a winding frame
132
fastened to the gate-form iron core
131
by press-fitting, an armature
133
, and an excitation coil
134
.
The gate-form iron core
131
is formed in the shape of a gate-form flat plate with a body (not shown) extending in the horizontal direction and a pair of legs
131
b
(only one leg
131
b
is shown) extending downward from both ends of the body. The core
131
is formed by stamping an iron core. Insertion parts
131
a,
press-fitted in the insertion holes
111
and
112
, protrude from the lower ends of the legs
131
b
of the gate-form iron core
131
. A projection
131
c
is formed on an upper portion of one end of the gate-form iron core
131
.
The winding frame
132
comprises a winding body (not shown) with a U-shaped cross section which extends in the horizontal direction and which has a U-shaped groove open at the top, flanges
132
a
arranged on both ends of the winding body, and a terminal
132
b
which extends to one side as a continuation of one of the flanges
132
a
. The winding frame
132
is formed by molding an insulating synthetic resin. The body of the gate-form iron core
131
is press-fitted in the U-shaped groove of the winding body of the winding frame
132
, so that the gate-form iron core
131
and the winding frame
132
are formed into an integral unit. Two coil terminals
135
are fastened to the terminal
132
b
. The excitation coil
134
is wound around the circumference of the winding body of the winding frame
132
, and the ends of the excitation coil
134
are connected to a respective one of the coil terminals
135
.
The armature
133
is constructed with an inverted gate shape by stamping an iron plate, and comprises a horizontal portion
133
a
extending in the horizontal direction, and a pair of vertical portions
133
b
and
133
c
extending upward from both ends of the horizontal portion
133
a
. A leg
133
d
acts as a support for the armature
133
and protrudes from a lower end of the vertical portion
133
b
on one end of the armature
133
. A protrusion
133
f
, used to regulate the pivoting range of the armature
133
, protrude from the lower end of the vertical portion
133
c
on the other end of the armature
133
. A recess
133
e
, mated with the projection
131
c
of the gate-form core
131
, is formed in the upper end of the vertical portion
133
b
on one end of the armature
133
on the axial line of the leg
133
d
. An insulating operating part
133
g
is mounted on the horizontal portion
133
a
of the armature
133
.
The operating electromagnet
130
, constructed as described above, is installed on the base housing
110
by press-fitting both insertion parts
131
a
of the gate-form iron core
131
in the insertion holes
111
and
112
, inserting the leg
133
d
of the armature
133
into the receiving hole
113
of the base housing
110
, and inserting the protrusion
133
f
into the receiving groove
114
. At the same time, the coil terminals
135
are passed through the through-holes
117
in the base housing
110
. In this manner, the leg
133
d
is supported in the receiving hole
113
, and the recess
133
e
on the axial line of the leg
133
d
engages with the projection
131
c.
In view of this assembly, the armature
133
can pivot about the leg
133
d
and the recess
133
e
on the axial line of the leg
133
d.
The armature
133
receives a spring force via the operating part
133
g
from the movable contact
123
, which also acts as a return spring, so that in the non-excited state of the excitation coil
134
, the vertical portion
133
c
on the second end of the armature
133
is separated from the gate-form iron core
131
. On the other hand, when the excitation coil
134
is excited, the vertical portion
133
c
on the second end of the armature
133
pivots about the leg
133
d
and the recess
133
e
located on the axial line of the leg
133
d,
and is caused to adhere to the gate-form iron core
131
. As a result, the movable contact
123
is pressed so that it undergoes elastic deformation, thus causing the contact points
122
and
124
to close.
The case
140
is a substantially rectangular member with an accommodating space (not shown) formed inside that covers the base housing
110
and the operating electromagnet
130
installed on the base housing
110
. The case
140
covers the base housing
110
and operating electromagnet
130
, and is anchored to the base housing
110
. A projection (not shown) is arranged in the accommodating space of the case
140
to press against the upper end on the side of the projection
131
c
of the gate-form iron core
131
and another projection (not shown) is arranged in the accommodating space to prevent the upper end of the vertical portion
133
b
on the pivoting fulcrum side (first end) of the armature
133
from tilting when the base housing
110
and operating electromagnet
130
are covered.
The electromagnetic relay constructed as described above provides an ultra-compact magnetic relay inexpensively and with high productivity.
Another conventional electromagnetic relay is shown in FIG.
8
and is described more fully in Japanese Patent No. 3011334. The electromagnetic relay has an operating electromagnet comprising a gate-form iron core
231
which has a body
231
a
extending in a horizontal direction and first and second legs
231
b
and
231
c
each extending from a respective end of the body
231
a
, an insulating winding frame
232
which is attached to the body
231
a
and around the circumference of which an excitation coil
234
is wound, and an armature
233
. The armature
233
has a horizontal portion
233
a
which extends in the horizontal direction and on which an insulating operating part
235
is arran
Barley Snyder
Enad Elvin
Rojas Bernard
Tyco Electronics EC K.K.
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