PURPOSE: To fix a thermister without being destroyed and to easily execute the attaching and detaching of the thermistor to a base by providing the holding device of the thermister on a cover rear board to be fixed in the back of the base.
CONSTITUTION: In the back of a base 13, a cover rear board 20 is fixed to the base 13 by a screw 21. Further, the cover rear board 20 is fitted with a cover 22, which is in the upper part of the base 13, and there is no gap. Since the cover rear board 20 is fixed by a screw 22 in a condition that a lead wire 17 is passed through a holding device 24 of structure to provide a groove 23 in the cover rear board 20, a thermister 14 is regulated to move forward and backward. The thermister 14 covered with a heat-resistant tube 16 is inserted deep in a fitting hole 15 which is provided in the base 13. Thus, since the lead wire 17 is fixed by a holding device 23, the thermister 14 can be fixed without directly adding force to the thermister 14 and the temperature can be prevented from being dispersed by the intensity of the fixing. When such a fitting hole 15 is obtained, the thermister 14 can be easily exchanged only by unfastening the screw 21 of the cover rear board 20.
YAGI TOYOHIKO
KUMAMOTO RYOJI
