Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Reexamination Certificate
2002-03-25
2004-07-13
Donovan, Lincoln (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
C335S121000
Reexamination Certificate
active
06762663
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application is based on Japanese Patent Applications No. 2001-109102 filed on Apr. 6, 2001, and No. 2001-220299 filed on Jul. 19, 2001, the disclosure of which is incorporated herein by reference.
FIELD OF THE INVENTION
The present invention relates to an electromagnetic switch used in a starter for starting an internal combustion engine.
BACKGROUND OF THE INVENTION
According to an electromagnetic switch in JP-U-63-50432, a sealing member
120
is compressively fitted in a recess
110
formed on the inner wall of a molded cover
100
, as shown in
FIG. 10. A
lead wire
140
of a coil is pulled out of the molded cover
100
through a through hole
130
of the molded cover
100
and a through hole in the sealing member
120
. An end of the lead wire
140
pulled out of the molded cover
100
is soldered with a terminal
150
fixed on the molded cover
100
. The through hole
130
of the molded cover
100
is sealed with solder
160
in order to secure air-tightness of the molded cover
100
. In this electromagnetic switch, the lead wire
140
has to be manually pulled out of the molded cover
100
because the lead wire
140
does not have rigidity. Further, the air-tightness is influenced by a soldering quality.
Incidentally, in this kind of electromagnetic switch, a return spring is slidablly mounted on the outer periphery of a rod supporting a movable contact. However, the return spring is likely to be interfered around the rod when it is mounted onto the rod and when it slides on the rod.
SUMMARY OF THE INVENTION
The present invention is made in view of the above problems, and it is an object to provide an electromagnetic switch for a starter, which is capable of being automatically assembled.
It is another object to provide an electromagnetic switch for a starter, which is capable of being automatically assembled and providing air-tightness.
It is further another object to provide an electromagnetic switch for a starter in which a return spring is properly mounted without being interfered.
It is still another object to improve mountability and slidability of the return spring.
According to an aspect of the present invention, in an electromagnetic switch for a starter, a plate-like terminal having rigidity is press-fitted in a bobbin in an axial direction, and an end of an excitation coil wound around the bobbin is connected to the terminal. A cover is mounted such that the terminal passes through the cover.
In this structure, the terminal connected to the excitation coil extends out the molded cover, instead of pulling the excitation coil without having rigidity out of the molded cover. Therefore, steps up to fixing the molded cover can be automatically operated in an assembly process.
According to another aspect of the present invention, a rod supporting a movable contact at an end is movable with a plunger through a return spring in an axial direction. The rod has an annular groove on its outer circumferential surface and a rod cover is fitted on the rod. The rod cover has a flange, a cylindrical part and a distal end opposite to the flange. The cylindrical part has a plurality of projections which project inwardly from the inner circumferential surface of the cylindrical part to be fitted in the annular groove. The plurality of projections is arranged in the circumferential direction. The cylindrical part defines a plurality of slits that extend in the axial direction between the adjacent projections and is closed before the distal end.
In this structure, the cylindrical part other than the distal end of the rod cover can expands radially outward while the plurality of projections is passing on the outer periphery of the rod and before it is fitted in the annular groove when the rod cover is mounted onto the rod. Therefore, the rod cover is properly mounted onto the rod. In addition, since plurality of slits is closed before the distal end and the distal end has an annular shape, the distal end of the cylindrical part is restricted from expanding radially outward so that the cylindrical part remains its original shape after the rod cover is fitted on the rod. The return spring is mounted onto the rod cover by being guided by the outer circumferential surface of the cylindrical part from its distal end side, as a guide surface. Therefore, it is restricted that the return spring is caught in the plurality of slits of the rod cover. Accordingly, the return spring is properly mounted onto and slidable on the rod cover.
REFERENCES:
patent: 6229416 (2001-05-01), Ebihara et al.
patent: U 63-50432 (1988-04-01), None
patent: U 2-58304 (1990-04-01), None
patent: Y2 6-43977 (1994-11-01), None
Andoh Kazuhiro
Usami Shinji
Denso Corporation
Donovan Lincoln
Oliff & Berridg,e PLC
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