Switch using solenoid

Details Switch using solenoid Switch using solenoid

2000-04-18

2002-01-08

Barrera, Ramon M. (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Radio frequency switch

C335S229000, C335S230000, C335S234000

Reexamination Certificate

active

06337612

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a switch using solenoid utilized in a radio frequency system. More particularly, it relates to a switch using solenoid capable of reducing the number of parts and total size of the switch.
DESCRIPTION OF THE PRIOR ART
Generally, there are a latching type switch, a fail-safe type switch and the like in switches using solenoid for a radio frequency system.
Hereinafter, conventional switches using solenoid will be schematically described, referring to
FIGS. 1 and 2
.
FIG. 1
shows a structure of the latching type switch using solenoid of the prior art.
As shown in
FIG. 1
, the conventional latching type switch has two solenoids
1
and
2
generating a magnetic field when electric current flows thereinto, a permanent magnet
3
located between the two solenoids
1
and
2
, and a rocker
4
disposed under the solenoids
1
and
2
. The rocker
4
is magnetized by the permanent magnet
3
to have N-S-N poles. Therefore, when electric current flows into the solenoid
1
or
2
, the magnetized rocker
4
seesaws with center in the middle portion thereof and performs switching operation. That is, when electric current flows into the right solenoid
2
so that N pole (North Pole) is generated in the lower portion thereof, repulsion occurs between the right solenoid
2
and the right portion of the rocker
4
adjacent to the right solenoid
2
. In this case, the right portion of the rocker
4
is descended and the left portion of the rocker
4
is ascended, so that the left portion of the rocker
4
is contacted to the bottom surface of the left solenoid
1
.
On the contrary, when electric current flows into the left solenoid
1
, the left portion of the rocker
4
is descended and the right portion of the rocker
4
is ascended, thereby contacting the right portion to the lower surface of the right solenoid
2
.
Further, the conventional latching type switch has a plate spring
5
fixed to the lower portion of the rocker
4
, two push pins
6
and
7
respectively located under both sides of the plate spring
5
, and a plurality of connectors
8
a,
8
b
and
8
c
located under the push pins
6
and
7
. The push pins
6
and
7
have compression coil springs
6
a
and
7
a
respectively surrounding the upper portion thereof, and reeds
6
b
and
7
b
fixed to lower end thereof.
The plate spring
5
is moved in upward and downward directions together with the rocker
4
. Therefore, when electric current flows into the right solenoid
2
, the right portion of the plate spring
5
is descended by seesaw of the rocker
4
and presses the push pin
7
. Simultaneously, the reed
7
b
fixed to lower end of the push pin
7
electrically connects the connectors
8
b
and
8
c.
In this state, when electric current flowing into the solenoid
2
is turned off and electric current flows into the left solenoid
1
, the push pin
6
is pressed by seesaw of the rocker
4
. Then, the compression coil spring
7
a
provides a restoring force for the push pin
7
, thereby ascending the moved push pin
7
and separating the reed
7
b
from the connectors
8
b
and
8
c.
Further, the reed
6
b
fixed to the lower end of the push pin
6
electrically connects the connectors
8
a
and
8
b.
However, since the conventional latching type switch using solenoid requires two solenoids to move a rocker, the total size of the switch is large and the manufacturing cost is expensive.
Meanwhile,
FIG. 2
shows a structure of the fail-safe type switch using solenoid of the prior art.
As shown in
FIG. 2
, the conventional fail-safe type switch comprises a solenoid
10
generating a magnetic field while electric current flows thereinto, a pushing rod
20
movably disposed at center portion of the solenoid
10
, a rocker
30
located under the pushing rod
20
, a compression spring
40
disposed on the rocker
30
, and a plurality of connectors
61
,
62
and
63
. Further, under both sides of the rocker
30
, two push pins
51
and
52
are movably disposed in upward and downward directions. Also, the push pins
51
and
52
have compression coil springs
51
a
and
52
a
respectively surrounding their peripheral surfaces, and reeds
51
b
and
52
b
fixed to their lower ends.
In this case, the pushing rod
20
is adjacent to the left portion of the rocker
30
and a lower end of the compression spring
40
is fixed to the right portion of the rocker
30
.
In the state, when electric current flows into the solenoid
10
to generate the magnetic field, the pushing rod
20
descends and presses the left portion of the rocker
30
. Then, the rocker
30
seesaws with center in the middle portion thereof, thereby pushing down the left push pin
51
so that the reed
51
b
fixed to the lower end of the push pin
51
electrically connects the connectors
61
and
62
and the compression spring
40
is compressed. The inclined state of the rocker
30
is continuously retained while electric current flows into the solenoid
10
.
On the contrary, when electric current flowing into the solenoid
10
is turned off, the right portion of the rocker
30
is descended by restoring force of the compression spring
40
and the left portion of the rocker
30
is ascended. In this case, the right push pin
52
pressed by the right portion of the rocker
30
is descended so that the reed
52
b
electrically connects the connectors
62
and
63
. Simultaneously, the left push pin
51
is ascended by restoring force of the compression coil spring
51
a
surrounding its peripheral portion.
However, since the conventional fail-safe type switch, for retaining the state descending the left push pin, must continuously flow electric current into the solenoid, the solenoid radiates high-temperature heat disturbing flow of electric current, thereby weakening the force moving the pushing rod. Therefore, since the size of the solenoid must be large in order to compensate the weakened force, total size of the fail-safe type switch is larger than the conventional latching type switch.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a switch using solenoid capable of reducing the number of parts and a manufacturing cost of the switch, and minimizing total size of the switch.
In accordance with an aspect of the present invention, the switch of the present invention comprises a base having a plurality of grooves formed thereon; a plurality of solenoids having an armature respectively, and being respectively disposed above the grooves, wherein the armature is moved in upward and downward directions while an electric current flows into the solenoid; a plurality of connectors respectively disposed in the grooves; and a plurality of contact means for electrically connecting the connectors disposed in each of the grooves, and being movably disposed in the grooves to be pressed by the armature moved in downward direction.
Also, in another aspect of the present invention, solenoid used in the switch comprises a bobbin core generating a magnetic field while an electric current flows thereinto, and having a through hole formed vertically therethrough; a conductive coil for guiding the electric current, and being wound round peripheral surface of the bobbin core; an armature being magnetized by the magnetic field generated on the bobbin core, and being movably disposed within the through hole; a plurality of magnetization means generating a definite magnetic field, and being disposed at both ends of the bobbin core; a plurality of first magnetic substances disposed between the bobbin core and each of the magnetization means, and being magnetized by the magnetization means adjacent thereto; and a plurality of second magnetic substances respectively disposed at outer sides of the magnetization means, and being magnetized by the magnetization means adjacent thereto.


REFERENCES:
patent: 2926318 (1960-02-01), Lanctot
patent: 4127835 (1978-11-01), Knutson

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