Electromagnetic relay
First Claim
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1. An electromagnetic relay comprising:
- a case having an opening at one end thereof and covering said whole electromagnetic relay;
a spool with a coil as an electromagnet wound therearound, said spool including a first flange disposed inside said case and at an opened side of said case, and a second flange disposed at an inner part of said case;
a fixed contact disposed at a top end part of a fixed terminal extending to a position closer to the inner part of said case than said second flange of said spool; and
a movable contact disposed at a position closer to the inner part of said case than said fixed contact, the movable contact being brought into contact with or separated from said fixed contact by an attraction force of the electromagnet and a restoring force of a spring for supporting said movable contact, whereby a conduction state between a movable terminal conductively coupled to said movable contact and said fixed terminal is switched over, wherein said second flange has an end edge part facing the top end part of said fixed terminal, and a low strength part, which is low in rigidity and on which stress concentrates, disposed along a portion demarcating the end edge part of said second flange, and said fixed terminal is secured to said first flange.
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Abstract
A low strength part (groove) 62, which is low in rigidity and on which stress concentrates, is formed along a portion demarcating the end edge part 61 of a flange 32b located at the inner part of a case, which faces the top end part (plate-like part 41a) of a fixed terminal 41. The fixed terminal 41 is secured to a flange 32a which is located at the opened side of the case.
25 Citations
10 Claims
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1. An electromagnetic relay comprising:
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a case having an opening at one end thereof and covering said whole electromagnetic relay;
a spool with a coil as an electromagnet wound therearound, said spool including a first flange disposed inside said case and at an opened side of said case, and a second flange disposed at an inner part of said case;
a fixed contact disposed at a top end part of a fixed terminal extending to a position closer to the inner part of said case than said second flange of said spool; and
a movable contact disposed at a position closer to the inner part of said case than said fixed contact, the movable contact being brought into contact with or separated from said fixed contact by an attraction force of the electromagnet and a restoring force of a spring for supporting said movable contact, whereby a conduction state between a movable terminal conductively coupled to said movable contact and said fixed terminal is switched over, wherein said second flange has an end edge part facing the top end part of said fixed terminal, and a low strength part, which is low in rigidity and on which stress concentrates, disposed along a portion demarcating the end edge part of said second flange, and said fixed terminal is secured to said first flange. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10)
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8. An electromagnetic relay comprising:
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a case having an opening at one end thereof and covering said whole electromagnetic relay;
a spool with a coil as an electromagnet wound therearound, said spool including a first flange disposed inside said case and at an opened side of said case, and a second flange disposed at an inner part of said case;
a movable iron member, on which attraction force of the electromagnet acts, disposed at a position closer to the inner part of said case than said spool;
a fixed contact disposed at a top end part of a fixed terminal extending to a position closer to the inner part of said case than said second flange of said spool; and
a movable contact, which moves in associated with said movable iron member, disposed at a position closer to the inner part of said case than said fixed contact, the movable contact being brought into contact with or separated from said fixed contact by an attraction force of the electromagnet and a restoring force of a spring for supporting said movable contact, whereby a conduction state between a movable contact terminal conductively coupled to said movable contact and said fixed terminal is switched over, wherein said second flange has at least one protruded part disposed on an surface of said spool facing the inner part of said case, said protruded part coming in contact with said movable iron member to press said movable iron member to the inner side of said case when said spool is thermally expanded in a coil axial direction. - View Dependent Claims (9)
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Specification