Thermal pellet incorporated thermal fuse and method of producing thermal pellet
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United States of America Patent
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Jan 29, 2008
Grant Date -
Apr 28, 2005
app pub date -
Oct 22, 2004
filing date -
Oct 28, 2003
priority date (Note) -
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Abstract
A thermal fuse incorporating a thermal pellet has its operating temperature, or heat distortion temperature, adjusted and the thermosensitive material of the pellet avoids deformation, modification or similar deficiency if it is exposed to a severe external environment. The inexpensive thermal fuse provides a wider range from which an operating temperature can be selected, improved insulation resistance after operation, faster response speed in operation, and enhanced strength of the thermal pellet. The thermosensitive material is formed of a thermoplastic resin corresponding to a high molecular weight substance. The thermal pellet's heat distortion temperature is adjusted by a temperature setting method. An enclosure of the fuse has a metal casing with a spring member's strong and weak compression springs both accommodated therein and hermetically sealed.
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