Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Reexamination Certificate
2000-08-03
2001-07-24
Barrera, Ramon M. (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
C335S078000, C335S128000, C335S270000, C335S275000
Reexamination Certificate
active
06265958
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electromagnetic relay, a joining structure for a hinge spring and a yoke in the electromagnetic relay, and a flux penetration preventing structure, and more particularly, to a joining structure for joining a hinge spring to a yoke in the electromagnetic relay, and a terminal side sealing structure for an anti-flux type electromagnetic relay mounted on a printed circuit board.
2. Description of the Related Art
In the construction of an electromagnetic relay, for example, a coil is wound around an iron core to construct an electromagnet, and a yoke as a component to complete a magnetic circuit with it is fastened rigidly to the iron core and an armature is rotatably mounted in such a manner as to bridge between the yoke and the head of the iron core of the electromagnet to construct an electromagnet structure. Then, one end of this electromagnet structure is fixed to the yoke and the other end thereof is made to engage with the armature, the rotatable movement of the armature being supported by a plate-like hinge spring formed from a resilient member.
Incidentally, assembling the hinge spring to the yoke in the electromagnetic relay requires assembling equipment (such as a crimping tool or a welder). This has presented the problem in that the assembling requires many assembling steps and takes a lot of time.
Further, in the prior art, when mounting the electromagnetic relay on a printed circuit board, the printed circuit board is passed through a high-temperature solder bath, for example, and the electromagnetic relay with solder applied to the terminal leads thereof is mounted rigidly on the printed circuit board. At this time, there is a possibility that flux may rise from the solder bath and penetrate into the interior of the electromagnetic relay; to prevent this, the bottom of the electromagnetic relay (base block) is sealed.
In constructing an electromagnetic relay having such a flux penetration preventing structure, a liquid sealant is filled into the base of the base block and the liquid sealant is then heated to form the sealing structure. This, however, has entailed the problem that, when the liquid sealant cures after heating, bubbles are trapped in the sealing structure, forming pinholes and defeating the purpose of the sealing.
The prior art electromagnetic relay and problems associated with the prior art will be described in detail later with reference to drawings.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a simple part-to-part joining structure that allows the hinge spring to be assembled to the yoke in an electromagnetic relay without requiring specific assembling equipment, and thereby simplify the assembly process and drastically reduce the number of assembling steps required. It is another object of the present invention to enhance work efficiency by smoothly performing sealing work and providing pinhole-free sealing to the bottom sealing portion of the base block of the electromagnetic relay.
According to the present invention, there is provided a joining structure for joining a hinge spring to a yoke in an electromagnetic relay, wherein the hinge spring includes a tongue and a dish-shaped portion; the yoke includes an engaging hole and a fitting portion for engaging with the tongue and the dish-shaped portion, and the hinge spring is joined to the yoke by inserting and fitting the hinge spring into the yoke.
Further, according to the present invention, there is provided an electromagnetic relay comprising an iron core; an armature; a coil wound around the iron core; a yoke, fastened rigidly to the iron core, having an engaging hole and a fitting portion; a hinge spring for supporting the armature rotatably on the yoke; and a joining structure for joining the hinge spring to the yoke in the electromagnetic relay, wherein the hinge spring includes a tongue and a dish-shaped portion; the yoke includes an engaging hole and a fitting portion for engaging with the tongue and the dish-shaped portion, and the hinge spring is joined to the yoke by inserting and fitting the hinge spring into the yoke.
The dish-shaped portion of the hinge spring may include a center hole, and the fitting portion of the yoke may include a recessed part and a raised part corresponding to the center hole of the dish-shaped portion. The recessed part and the raised part of the fitting portion engaged with the hinge spring on the yoke may be formed within a plate thickness of the yoke. The dish-shaped portion may be formed as a circular shape. The tongue of the hinge spring may be formed as a U-shape.
According to the present invention, there is also provided a flux penetration preventing structure for an electromagnetic relay, wherein a coil bobbin is formed, integral with or separate from a base block, and a venting portion for allowing air trapped in a center hole in the coil bobbin to be vented therethrough, is formed in an upper flange of the coil bobbin.
Further, according to the present invention, there is provided an electromagnetic relay comprising an iron core having an iron core head; a coil bobbin for winding a coil around the iron core, formed integral with or separate from, a base block; and a venting portion, for allowing air trapped in a center hole in the coil bobbin to be vented therethrough, formed in an upper flange of the coil bobbin.
The venting portion may comprise at least one groove formed in the upper flange of the coil bobbin in a position where the upper flange contacts the underside of an iron core head. The venting portion may comprise four grooves.
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Nakabayashi Takahiro
Takano Satoshi
Yoshino Kosei
Arent Fox Kintner & Plotkin & Kahn, PLLC
Barrera Ramon M.
Takamisawa Electric Co., Ltd.
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