Claims
- 1. In a thermal cutout fuse comprising:
- a movable contact member composed of a first lead wire thrust into a housing, a shank portion opposed to the thrust end of said first lead wire within the housing, and a movable contact surface formed at the lead end thereof,
- a stationary contact surface formed inside said housing round said movable contact surface and electrically connected to a second lead wire extended outwardly from said housing,
- a coil spring disposed astride round said shank portion of said movable contact member and said thrust end of said first lead wire and adapted to support mechanically said movable contact member in position and assume resilient force of bending elasticity tending to separate said movable contact member from said stationary contact surface toward a second posture when said movable contact member is brought into a first posture having the movable contact surface kept in contiguity with said stationary contact surface,
- a thermally sensitive pellet formulated to have a melting point conforming to the preset unsafe temperature and disposed inside said housing opposite said movable contact member, and
- a solid member interposed between said thermally sensitive pellet and said movable contact member and adapted to keep said movable contact member in said first posture against the bending elasticity of said coil spring, the improvement which comprises an insulator layer interposed between said coil spring and said movable contact member and said coil spring adapted to assume compressive elasticity in the longitudinal direction thereof in said first posture having contiguity between said movable contact surface and said stationary contact surface and between said shank portion of said movable contact member and said thrust end of said first lead wire, whereby said shank portion and said thrust end are separated from each other during the beginning of the motion toward said second posture.
- 2. A thermal cutout fuse as set forth in claim 1 in which an insulator layer is interposed between the coil spring and the thrust end of said first lead wire.
Priority Claims (1)
Number |
Date |
Country |
Kind |
56-158144 |
Oct 1981 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 425,677, filed Sept. 29, 1982, now U.S. Pat. No. 4,480,247.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4480247 |
Hara |
Oct 1984 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
425677 |
Sep 1982 |
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