Electricity: circuit makers and breakers – Special application – Portable light
Reexamination Certificate
2002-04-19
2004-07-13
Enad, Elvin (Department: 2832)
Electricity: circuit makers and breakers
Special application
Portable light
C200S051090, C200S051010, C439S181000
Reexamination Certificate
active
06762376
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaking apparatus for electrically breaking an interval between a power source portion and a load portion.
In the case of, for example, an electric automobile, a capacity of a power source which is a battery, is larger than that of an ordinary gasoline engine vehicle or the like. Therefore, when an electric system or the like thereof is subjected to maintenance, a power source circuit is opened (turned off) by a circuit breaking apparatus to thereby ensure safety of operation. There is a related circuit breaking apparatus of this kind as shown by FIG.
26
.
As shown by
FIG. 26
, a circuit breaking apparatus
200
is provided with a main relay
202
and a sub relay
203
respectively controlled to open and close by a control unit
201
and both of the main relay
202
and the sub relay
203
are provided with power source side terminals
205
and
206
connected to a power source portion
204
and load side terminals
208
and
209
connected to a load portion
207
. The load side terminal
209
of the sub relay
203
is connected to the load portion
207
by way of a resistor
210
.
According to the above-described constitution, when the main relay
202
and the sub relay
203
are disposed at opened positions and a power source circuit is closed, there is carried out a control of closing firstly the sub relay
203
and closing the main relay
202
after elapse of a predetermined time period by the control unit
201
. The power source portion
204
and the load portion
207
are connected via the resistor
210
by firstly closing the sub relay
203
and therefore, a capacitor or the like of the load portion
207
is charged by small current and after charging has been finished, the main relay
202
is closed to thereby connect the power source portion
204
and the load portion
207
directly without interposing a resistor.
That is, in the case in which the load portion
207
is provided with a capacitor or the like, when the sub relay
203
is not provided and only the main relay
202
is provided and the power source portion
204
and the load portion
207
are abruptly connected directly without interposing a resistor, in bringing the power source side terminal
205
and the load side terminal
208
into contact with each other, large current flows to the capacitor or the like via the terminals and therefore, arc discharge is generated between the terminals
205
and
208
and there is brought about a situation of melting the terminals
205
and
208
. Hence, the sub relay
203
is provided other than the main relay
202
to thereby prevent the terminals from being melted by arc discharge.
However, according to the related circuit breaking apparatus
200
, there are needed two relays of the main relay
202
and the sub relay
203
and there is needed the control unit
201
for controlling the relays and therefore, there poses a problem that the cost is high and the apparatus is complicated and large-sized.
There is provided an another circuit breaking apparatus of this kind disclosed in Japanese Patent Laid-Open No. 306265/1996 shown in FIG.
27
.
As shown by
FIG. 27
, there is provided a switch mechanism containing chamber
302
at inside of an apparatus main body
301
of the circuit breaking apparatus
300
and the switch mechanism containing chamber
302
is provided with a pair of rod terminals
303
and
304
. The pair of rod terminals
303
and
304
are arranged on a straight line at positions separated from each other. Further, the switch mechanism containing chamber
302
is arranged with a connection cylinder portion
305
of a conductive member in a cylindrical shape and elastic contact portions
306
are provided at two locations on an inner peripheral side of the connection cylinder portion
305
.
Further, an operating lever member
307
is supported by the connection cylinder portion
305
via a support pin
307
a
and a lower end of the operating lever member
307
is provided at the apparatus main body
301
rotatably via a rotating shaft
308
. An upper end of the operating lever member
307
is exposed to outside from the apparatus main body
301
and a grub portion
309
is provided at the upper end of the exposed operating lever member
307
. By operating the operating lever member
307
, the connection cylinder portion
305
is moved to slide between a conducting position shown by bold lines in
FIG. 27 and a
breaking position shown by imaginary lines in FIG.
27
.
According to the above-described constitution, the pair of rod terminals
303
and
304
can electrically be connected by disposing the connection cylinder portion
305
at the conducting position by operating the operating lever member
307
and the pair of rod terminals
303
and
304
can electrically be broken by disposing the connection cylinder portion
305
at the breaking position by operating the operating lever member
307
. That is, in order to move to slide the connection cylinder portion
305
, the operating lever member
307
is connected to the connection cylinder portion
305
, a fulcrum of force is constituted by one end side (lower end side) of the operating lever member
307
, a force exerting point of the force is constituted by other end side (upper end) of the operating lever member
307
and the connection cylinder portion
305
can be moved by small operating force by utilizing the principle.
However, it is necessary to provide the operating lever member
307
rotatably supported by the connection cylinder portion
305
and move the upper end side of the operating lever
307
(grub portion
309
) in parallel with sliding movement of the connection cylinder portion
305
and therefore, there poses a problem that the apparatus is large-sized.
In this case, in order to resolve large-sized formation of the apparatus, there is conceivable a constitution in which a movable plug is provided to be simply able to insert and extract to and from an apparatus main body, a pair of terminals are connected via a conductive portion of the movable plug by inserting the movable plug into the apparatus main body and the pair of terminals are broken by drawing the movable plug from the apparatus main body. However, according to such an apparatus, it is necessary to prevent erroneous insertion by which the movable plug is inserted to the apparatus main body not at a regular rotational position. That is, because according to a constitution in which the movable plug is locked at a circuit closed position, there is a concern of causing inconvenience that the movable plug cannot be locked unless the movable plug is inserted at the regular rotational position, or according to a constitution in which the movable plug is brought into proper contact with the terminal at an inner portion only at a proper rotational position, there is a concern of bringing about various inconveniences of causing contact failure, terminal destruction and the like. Further, according to such an apparatus, when the movable plug is simply inserted into the apparatus main body, large operational force is needed and therefore, a guide groove is provided on the side of the apparatus main body and a projection capable of being inserted into the guide groove is provided at the movable plug, respectively, further, there is provided a guide portion for rotation inclined in a skewed depth direction relative to a direction orthogonal to an inserting direction at a section of the guide groove from a position before finishing to insert the movable plug to a position of finishing to insert the movable plug. Further, it is conceivable that after inserting the movable plug into the apparatus main body to some degree, the movable plug is inserted while rotating the movable plug by operating to rotate the movable plug (convert rotational force into inserting force), thereby, the movable plug is inserted thereinto by small operational force.
However, according to the constitution having the operation of inserting the movable plug and the operation of rotating t
Kobayashi Hiroshi
Nakamura Goro
Satoh Takahiro
Yokoyama Hidenori
Enad Elvin
Poker Jennifer A.
Yazaki -Corporation
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