Power source electrical switch

Details Power source electrical switch Power source electrical switch

2001-08-15

2003-02-25

Gandhi, Jayprakash N. (Department: 2841)

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

C337S059000, C337S112000, C337S334000, C200S553000

Reexamination Certificate

active

06525639

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to a power source switch, and more particularly to an electrical switch.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, an electrical switch
1
of the prior art comprises a case
2
, two power source terminals
3
a
and
3
b
which are disposed in the case
2
, a conductive piece
4
, a touch switch structure
5
, and a spring piece
6
. The conductive piece
4
is fastened at one end with the power source terminal
3
a
. The touch switch structure
5
has a push button
5
a
and an action rod
5
b
disposed under the push button
5
a
. The push button
5
a
is disposed over the case
2
. The action rod
5
b
is connected at the free end with other end of the conductive piece
4
. The spring piece
6
is connected with other end of the conductive piece
4
such that the spring piece
6
urges the action rod
5
b
. In operation, the push button
5
a
is first pressed to cause two ends of the conductive piece
4
to make contact with the two power source terminals
3
a
and
3
b
, thereby resulting in the current flow. When the conductive piece
4
is overloaded, the conductive piece
4
is caused to deform by heat. As a result, the spring piece
6
is forced to jump upwards, so as to push the action rod
5
b
to displace upwards. The conductive piece
4
and the spring piece
6
are actuated to move upwards to bring about the separation of the conductive piece
4
from the power source terminal
3
b
, thereby resulting in interruption of the flow of the electric current. In light of the spring piece
6
urging only one side of the action rod
5
b
, the action rod
5
b
is apt to move aside. In addition, the extent of deformation of the conductive piece
4
is often dependent on the climatic factors as well as the nature of the material of which the conductive piece
4
is made. In other words, the conductive piece
4
and the spring force
6
of the prior art electrical switch are not reliable at best. The prior art electrical switch is thus a potential fire hazard.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide an electrical switch which is capable of a precision interruption of the flow of an electrical current.
The electrical switch of the present invention comprises a housing in which at least two power source terminals are fixedly disposed such that one of the two terminals is connected with a conductive piece which is disposed in the housing for conducting or interrupting electrically the two terminals. A link structure comprises a push button which is pivoted in the housing, and a support rod fastened at one end with the push button. The support rod is connected at other end with the conductive piece such that an external force enables the support rod to cause the conductive piece to make contact with or to separate from other one of the two power source terminals. A spring piece is fastened with the housing and the support rod of the link structure. When the current of the conductive piece is excessive, the spring piece is so heated as to jump to cause the conductive piece to separate from other one of the two terminals. An adjustment device is exerted on by a predetermined force to change the condition of being heated by the conductive piece under the circumstance that the conductive piece is electrically connected with the two power source terminals.


REFERENCES:
patent: 4510479 (1985-04-01), Merchant
patent: 5451729 (1995-09-01), Onderka et al.
patent: 5541569 (1996-07-01), Jang
patent: 6121868 (2000-09-01), Chiang
patent: 6154116 (2000-11-01), Sorenson
patent: 6275134 (2001-08-01), Chen

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