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US 2003/0226903 A1Published application
Thermostat
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsIchiro Onishi, Yoshihide Nakajima, Naotake Kokubu
Life of this patent
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Abstract
A thermostat includes a wall plate unitarily molded of thermoplastic resin, a first metal plate holding a temperature sensing section, and a second metal plate holding a cam shaft. A fulcrum of a lever and a fulcrum of adjusting plate are protected by the wall plate and they are not exposed to the outside. Since both the fulcrums are not exposed to the outside, the fulcrums are free from being touched with foreign matters. This thermostat thus prevents a temperature set therein from changing.
Claims6
A thermostat comprising:
- (a) a housing;
- (b) a contact;
- (c) a switch mechanism accommodated in the housing;
- (d) a temperature sensing section for converting a volume change of gas, which is expanded or compressed in response to an ambient temperature, into force that operates the switch mechanism;
- (e) a lever receiving the force from the temperature sensing section for rotating on a first fulcrum to turn on or off the contact;
- (f) an adjusting plate engaging with the lever for rotating on a second fulcrum to increase or decrease the force necessary for rotating the lever;
- and
- (g) a cam shaft including a cam that rotates the adjusting plate,
- wherein the housing is placed outside a supporting wall that supports the first and the second fulcrums, and includes a wall that covers the first and the second fulcrums.
6 more elements
Dependencies are inferred from the claim text.