Thermal overload relay
AssigneeFuji Electric Co., Ltd.
InventorsYukinari Furuhata, Toshikatsu Ohgami, Fumihiro Morishita, Naoki Fukaya, Teruhisa Okutsu
Life of this patent
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Abstract
A thermal overload relay includes an inversion operation mechanism that is driven by a releasing lever to open or close a contact. The inversion operation mechanism includes a movable plate supported at one end so as to be inverted, and a tension spring for driving the movable plate for inversion. The releasing lever presses a middle of a wire of the tension spring to drive the movable plate for inversion. A projection is formed in the middle of the wire of the tension spring to contact with the releasing lever. Thus, a stable inversion operation can be made regardless of the positioning of an adjustment dial.
Claims5
A thermal overload relay for an output contact comprising:
- a main bimetal to be bent by overcurrent for opening and closing a contact,
- a releasing lever situated near the main bimetal to be displaced by an operation of the main bimetal,
- an inversion operation mechanism driven by the releasing lever to open or close the contact, said inversion operation mechanism including a movable plate having a support point to be inverted at the support point, and a tension spring for inverting the movable plate supported and pressed by a middle of the releasing lever to be actuated by the releasing lever for inversion, said tension spring having a projection in a middle of thereof and contacting the releasing lever,
- an adjustment link coupled to one end of the releasing lever to move the releasing lever, and
- an adjustment dial for adjusting a setting current coupled to the adjustment link to move the releasing lever through the adjustment link.
Dependencies are inferred from the claim text.