PURPOSE: To prevent a driving means in a nozzle main body from becoming an excessive temperature rise state, even if suction force of a suction chamber becomes small in the course of cleaning.
CONSTITUTION: Since a shape is stored so that suction/exhaust holes 12a, 12b become small at an ordinary temperature and they become large at a high temperature, when a temperature rise caused by heat generation of a motor 1 is ordinary, size of the suction/exhaust holes 12a, 12b can be made small so that influence is not exerted on the suction performance of the floor nozzle, and when the temperature rise caused by heat generation of the motor 1 becomes excessively high due to a certain reason, the suction/exhaust holes 12a, 12b become large, so that the air capacity of cooling air passing through these ventilation holes increases. Therefore, the motor 1 can be cleaned free from care at all times since a temperature does not rise excessively.
Go Tokuda
Yoshitaka Murata
