Bimetal and method for manufacturing the same
AssigneeTokyo Shibaura Electric Co., Ltd.
InventorsTatsuyoshi Aisaka, Mitsuo Kawai, Fumio Mori, Shinzo Sugai
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Abstract
A bimetal is disclosed having a high, rapid deflection over a specified temperature range, including a high expansion metal alloy component having a high thermal expansion coefficient that changes rapidly at 50.times.10.sup.-6 /.degree. C. or greater at a temperature of between about 100.degree. C. and 250.degree. C. and containing from 15-30% by weight of manganese, the balance of iron. The second component has a substantially constant thermal expansion coefficient regardless of the temperature change, and is preferably a stainless steel. These bimetals are used in circuit breakers, thermal protectors and the like.
Claims7
A bimetal comprising:
- (1) a high expansion component of a metal alloy whose thermal expansion coefficient rapidly changes from 21.5.times.10.sup.-6 /.degree.C. less to 50.times.10.sup.-6 /.degree.C. or more starting at a temperature of between 100.degree. C. and 250.degree. C., which consists of 15 to 30% by weight of manganese and substantially iron as the remainder, and which is substantially free from work strains and
- (2) a low expansion component of a metal alloy whose thermal expansion coefficient is substantially constant regardless of temperature change,
- said bimetal exhibiting a hysteresis.
A bimetal exhibiting a rapid deflection over a specified temperature range and having a high thermal expression coefficient, including:
- (1) a high expansion metal alloy component having a thermal expansion coefficient that changes rapidly in the range of about 21.5.times.19.sup.-6 /.degree.C. to about 50.times.10.sup.-6 /.degree.C. at a temperature of between about 100.degree. C. and 250.degree. C., said alloy consisting essentially of from 15 to 30% by weight of manganeses, and a member selected from the group consisting of 2 to 15% by weight of chromium, 2 to 15% by weight of cobalt and 2 to 20% by weight of a mixture of chromium and cobalt, the balance being iron, the high expansion component being substantially devoid of machine strain;
- and
- (2) a low expansion metal alloy component having a thermal expansion coefficient substantially constant notwithstanding temperature change,
- said bimetal exhibiting a hysteresis.
Dependencies are inferred from the claim text.