Patent ID: 8136995

Claim:
A sealing device comprising: a current supplied portion; and an interval adjusting portion for adjusting an interval between a first portion and a second portion by making the current supplied portion conductive or nonconductive wherein an interval between the first portion and the second portion in making the current supplied portion conductive is larger than an interval between the first portion and the second portion in making the current supplied portion nonconductive, wherein the interval adjusting portion includes a bimetal member constituted by bonding a first expansion member in a plate-like shape having a first thermal expansion coefficient and a second expansion member in a plate-like shape having a second thermal expansion coefficient different from the first thermal expansion coefficient and constituting a portion of at least one of the first portion and the second portion, wherein the bimetal member is deformed to increase the interval between the first portion and the second portion when a temperature of the bimetal member is elevated, the sealing device further including: a temperature measuring portion of measuring the temperature of the bimetal member, and wherein a current supplied to the current supplied portion when the temperature measured by the temperature measuring portion is smaller than a predetermined temperature is larger than a current supplied to the current supplied portion when the temperature measured by the temperature measuring portion is equal to larger than the predetermined temperature.