Hitachi, Ltd.

Morio Kobayashi

Toshio Shimada

Takemi Tada

Kenichi Iizuka

Shigeya Kawaminami

Ryoichi Fujimoto

Minoru Kobayashi

Hirokazu Yokonaga

A thermal protector comprises a case having a space surrounded by a bottom surface and a wall surface; a pair of fixed electrodes secured to the bottom surface of the case and located so as to be separated from each other in the space; a disk-shaped bimetal disposed in the space so as to be opposite to the fixed electrodes; a pair of contacts disposed on extremity portions of a surface of the bimetal opposite to the fixed electrodes, the bimetal being either in a conductive state, where the contacts are in contact with the pair of fixed electrodes, or in a non-conductive state, where, the bimetal being deformed, depending on temperature, they are not in contact with the pair of fixed electrodes; and inclined portions disposed on the wall surface with a predetermined interval from the extremity portions of the bimetal when the bimetal is deformed.

Thermal protector

An overload protective device to the disposed in an electric circuit serving to supply current to a load has a pair of fixed contacts provided inside of a case and an inversible disk-like bimetal of a curved shape having a pair of movable contacts capable of coming in contact with the fixed contacts, respectively. A shaft is fixed to the case at one end thereof and formed with a head portion at the free end portion. The shaft extends though a hole formed in the central portion of the bimetal. When the bimetal breaks, a circuit breaker breaks the electric circuit permanently to thereby prevent the load and the overload protective device from being burnt out.

Overload protective device

A refrigerator temperature control system is disclosed in which the compressor for compressing a refrigerant is driven selectively at either a normal lower rotation speed or a higher rotational speed and the higher rotational speed is applied only when any of the freezer compartment temperature and the fresh food compartment temperature is not reduced below a predetermined temperature level for at least a predetermined time interval.

Refrigerator temperature control system

Growing community of inventors

Oyama, Japan

Morio Kobayashi