US 5,337,029 AGranted

Polarized relay

AssigneeMatsushita Electric Works, Ltd.

InventorsKazuhiro Nobutoki, Kyoji Ueda, Hiroyuki Kita

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Abstract

A polarized relay includes a coil block having an elongated coil bobbin, a core inserted therein, and an excitation coil wound about the coil bobbin. The core has opposed pole ends projecting upwardly from longitudinal ends of the coil bobbin. A permanent magnet is interposed between the pole ends on the coil bobbin. Disposed on the coil block is an armature block which comprises an elongated generally flat armature and a set of movable springs carrying movable contacts. The movable springs are held together with the armature by means of an electrically insulating harness molded on the armature. The armature is pivotally supported on the coil block to be movable between two contact operating positions and constituting a magnetic circuit with the core and the permanent magnet for polarized operation of the armature. A terminal assembly is provided to include coil terminals leading to the excitation coil and fixed contact terminals provided respectively with fixed contacts at contact ends of the contact terminals. The polarized relay is characterized in that the coil block and the terminal assembly are molded together from an electrically insulating material into a single integral base unit on which the armature block is assembled with the movable contacts held in an engageable relation with the fixed contacts.

Claims16

Dependent claims

A polarized relay comprising:

a coil block having an elongated coil bobbin, a core inserted therein, and excitation coil means wound about said coil bobbin, said core having opposed pole ends projecting upwardly from longitudinal ends of said coil bobbin, said coil block including a permanent magnet interposed between said pole ends;
an armature block having an elongated generally flat armature and a set of movable springs carrying movable contacts and held together with said armature by means of an electrically insulating harness molded on said armature, said armature pivotally supported on said coil block to be movable between two contact operating positions and constituting a magnetic circuit with said core and said permanent magnet for polarized operation of said armature;
and
a terminal assembly including coil terminals leading to said coil means and fixed contact terminals provided respectively with fixed contacts at contact ends of said contact terminals;
said polarized relay characterized in that said coil block and said terminal assembly are molded together from an electrically insulating material into a single integral base unit on which said armature block is assembled with said movable contacts held in an engageable relation with said fixed contacts;
wherein said coil bobbin is formed integrally on its upper end with supports upon which said contact ends of said fixed contact terminals rest, respectively, said supports adapted to hold said contact ends against an upper molding die when molding said coil block into said base unit between said upper molding die and a lower molding die in order to retain said fixed contacts in place.

3 more elements

A polarized relay comprising:

a coil block having an elongated coil bobbin, a core inserted therein, and excitation coil means wound about said coil bobbin, said core having opposed pole ends projecting upwardly from longitudinal ends of said coil bobbin, said coil block including a permanent magnet interposed between said pole ends;
an armature block having an elongated generally flat armature and a set of movable springs carrying movable contacts and held together with said armature by means of an electrically insulating harness molded on said armature, said armature pivotally supported on said coil block by hinge springs to be movable between two contact operating positions and constituting a magnetic circuit with said core and said permanent magnet for polarized operation of said armature, said hinge springs being disposed on lateral sides of said armature at a longitudinal center of said armature, each of said hinge springs integrally formed with a beam projecting from said harness and with an anchor tab extending integrally from said beam and secured to a corresponding projection of said coil block, said harness formed integrally with a side post which projects on the lateral side of said armature and from which said beam extends over a limited length along the lateral side of said armature;
and
a terminal assembly including coil terminals leading to said coil means and fixed contact terminals provided respectively with fixed contacts at contact ends of said contact terminals;
said polarized relay characterized in that said coil block and said terminal assembly are molded together from an electrically insulating material into a single integral base unit on which said armature block is assembled with said movable contacts held in an engageable relation with said fixed contacts;
wherein said side post from which said beam extends is offset toward one longitudinal end of said armature from a longitudinal center thereof at which said armature is pivotally supported.

3 more elements

A polarized relay comprising:

a coil block having an elongated coil bobbin, a core inserted therein, and excitation coil means wound about said coil bobbin, said core having opposed pole ends projecting upwardly from longitudinal ends of said coil bobbin, said coil block including a permanent magnet interposed between said pole ends;
an armature block having an elongated generally flat armature and a set of movable springs carrying movable contacts and held together with said armature by means of an electrically insulating harness molded on said armature, said armature pivotally supported on said coil block by hinge springs to be movable between two contact operating positions and constituting a magnetic circuit with said core and said permanent magnet for polarized operation of said armature, said hinge springs being disposed on lateral sides of said armature at a longitudinal center of said armature, each of said hinge springs integrally formed with a beam projecting from said harness and with an anchor tab extending integrally from said beam and secured to a corresponding projection of said coil block, said harness formed integrally with a side post which projects on the lateral side of said armature and from which said beam extends over a limited length along the lateral side of said armature;
and
a terminal assembly including coil terminals leading to said coil means and fixed contact terminals provided respectively with fixed contacts at contact ends of said contact terminals;
said polarized relay characterized in that said coil block and said terminal assembly are molded together from an electrically insulating material into a single integral base unit on which said armature block is assembled with said movable contacts held in an engageable relation with said fixed contacts;
wherein said beam and said anchor tab lie substantially in the same plane and are integrally connected by means of a U-shaped segment which is bent in a direction perpendicular to said plane.

3 more elements

A method of making a polarized relay, comprising:

providing a coil block having an elongated coil bobbin, a core inserted therein, and excitation coil means wound about said coil bobbin, said bobbin being formed integrally on its upper end with supports, said core having opposed pole ends projecting upwardly from longitudinal ends of said coil bobbin, said coil block including a permanent magnet interposed between said pole ends;
providing an armature block having an elongated generally flat armature and a set of movable springs carrying movable contacts and held together with said armature by means of an electrically insulating harness molded on said armature, said armature pivotally supported on said coil block to be movable between two contact operating positions and constituting a magnetic circuit with said core and said permanent magnet for polarized operation of said armature;
providing a terminal assembly including coil terminals for attachment to said coil means and fixed contact terminals provided respectively with fixed contacts at contact ends of said contact terminals;
disposing said coil block and said terminal assembly in a mold having an upper molding die and a lower molding die so that said coil terminals lead to said coil means and so that said supports hold said contact ends against said upper molding die;
molding said coil block and said terminal assembly together by introducing an electrically insulating material into said mold to mold said coil block and said terminal assembly together into a single integral base unit;
and
assembling said armature block onto said integral base unit with said movable contacts held in an engageable relation with said fixed contacts.

4 more elements

Dependencies are inferred from the claim text.