Electricity: circuit makers and breakers – Solid contact – Push button operated
Reexamination Certificate
2001-10-30
2003-10-28
Luebke, Renee (Department: 2833)
Electricity: circuit makers and breakers
Solid contact
Push button operated
Reexamination Certificate
active
06639164
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a switch, and more particularly, to a switch having a movable member, which is depressed for the start or stop of the flow of electricity.
Referring to
FIGS. 1
, and
2
, a conventional switch includes a depressible member
15
, a fixing hook
13
, a propping plate
12
, and a base
11
. The base
11
has a bottom part
111
, an annular wall
112
, a holding room
113
defined by the annular wall
112
, and a positioning trench
114
formed on an inner side of the wall
112
to communicate with the holding room
113
. The holding room
113
has an upper opening. At least two conductive rods
14
are firmly passed through the bottom part
111
, each having an upper portion received in the holding room
113
and a lower portion sticking out from the bottom part
111
for connection to a socket.
The propping plate
12
includes a frame
121
, and a propping protrusion
122
having a sloping surface. The frame
121
is firmly fitted into the positioning trench
114
with the propping protrusion
122
facing the holding room
113
. The fixing hook
13
has an elongated portion (not numbered) connected to the plate
12
, and an engaging part
131
positioned on the sloping propping protrusion
122
to the plate
12
; thus, the engaging part
131
sticks out into the holding room
113
.
The depressible member
15
includes a main body
151
, a spring
152
connected to a lower part of the main body
151
, conductive elements
153
connected to the main body
151
, and a button
154
connected to the top of the main body
151
. An engaging board
16
is secured to one side of the main body
151
. The main body
151
is up and down movably passed into the holding room
113
with the engaging board
16
facing the fixing hook
13
, and with the spring
152
being located on the upper side of the bottom part
111
to bias the same upwards. The engaging board
16
has an engaging surface
161
, which is formed with a lower stopped block
162
, an upper guiding block
163
above the lower block
162
, and a guiding trench
164
surrounding both the lower and upper blocks
162
,
163
. The guiding trench
164
includes a power-off area
166
, which is below the lower stopped block
162
, and a power-on sport
165
, which is right above the upper part of the stopped block
162
.
The spring
152
normally biases the main body
151
up to a power-off position where the conductive elements
153
are kept away from the upper portions of the conductive rods
14
, and the engaging part
131
of the fixing hook
13
is received in the power-off area
166
of the guiding trench
164
. When the user depresses the depressible member
15
from the button
154
so as to cause the conductive elements
153
to come into contact with the upper portions of the conductive rods
14
, the engaging board
16
is moved relative to the fixing hook
13
so as to cause the engaging part
131
to move between the lower stopped block
162
and the upper guiding block
163
due to the guiding trench
164
. Thus, the engaging part
131
of the hook
13
will be located on the power-on spot
165
, and will engage the lower stopped block
162
to stop the main body
151
of the depressible member
15
from moving upwards when the user stops depressing the button
154
. Therefore, the conductive elements
153
of the depressible member
15
are kept in contact with the conductive rods
14
for allowing the flow of electricity.
Similarly, to cut off the electricity, the button
154
is depressed for the engaging board
16
to move relative to the fixing hook
16
so as to cause the engaging part
131
to move out of the power-on spot
165
of the guiding trench
164
. Thus, the engaging part
131
will be received in the power-off area
166
when the user stops depressing the button
154
, allowing the spring
152
to bias the depressible member
15
upwards to the power-off position.
However, the switch is found to have a drawback that in order for the engaging part
131
of the fixing hook
13
to abut the trench
164
of the engaging board
16
, the switch needs an additional component, i.e. the propping plate
12
for connection to the fixing hook. Consequently, the assembly would cost more labor and time.
SUMMARY OF THE INVENTION
Therefore, it is a main object of the present invention to provide a switch having a member depressible for starting the flow of electricity, which has less complicated structure and can be assembled with less labor.
The switch of the present invention includes a base, several conductive rods, a fixed hook, and a depressible member.
The base has a first bottom part, and an annular wall defining a holding room having an upper opening. The bottom part has insertion holes formed therein.
The conductive rods are each passed through one of the insertion holes with a first contact being positioned in the holding room and with a lower part sticking out for connection to a socket.
The fixing hook is positioned in the holding room, and has a lower secured portion positioned adjacent to the first bottom part. The fixing hook further has an upper engaging portion and an interposed portion connected to both the engaging portion and the secured portion; the interposed portion is arranged close to the annular wall, and leans forward, so as to position the engaging portion in the holding room.
The depressible member is up-and-down movably received in the holding room, and has second contacts each facing a respective one of the first contacts. The depressible member is biased up to a power-off position by a spring positioned between the secured portion and a lower part thereof. In the power-off position, the second contacts are kept away from the first contacts. The depressible member has an engaging surface facing the engaging portion of the hook for disengagably engaging the engaging portion so. Thus, the depressible member can be fixed in a power-on position when it is depressed from the power-off position, causing the second contacts to get into contact with the first contacts.
In addition, the base has a protruding portion projecting down from the first bottom part. The protruding portion has a slot on a bottom, and upper and lower securing blocks projecting out into the slot. The hook secured portion is positioned in the slot, and held in position by the upper and the lower securing blocks so as to be able to bend when the depressible member is depressed and cause the spring to press the secured portion. Therefore, the leaning interposed portion of the hook can lean further forward, and the engaging portion can move further into the holding room to abut the engaging surface.
Thus, the fixing hook doesn't need an additional propping element like that of the conventional switch.
REFERENCES:
patent: 4877931 (1989-10-01), Kawase et al.
patent: 5369237 (1994-11-01), Mejerl et al.
patent: 5841085 (1998-11-01), Rittinghaus et al.
patent: 3719636 (1988-12-01), None
Luebke Renee
Rosenberg , Klein & Lee
Shin Chin Industrial Co., Ltd.
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