| 摘要 |
PROBLEM TO BE SOLVED: To provide a height-adjustable low-lying frost-preventing fan unit for tea garden allowed to its own pole to shallowly be underground, capable of reducing e.g. the time or labor required for the boring for the pole, simplifying the digging work for and the installation of the pole and saving the place for the installation. SOLUTION: This frost-preventing fan unit designed to form a pole 1 of the low piers numbered from 1 to N, set the 1-numbered pole underground and mount a frost-preventing fan 5, which is so adjustable in angle of depression as to send air, onto the N-numbered pole so that the fan 5 is received into tea drills, comprises: a wire 33 disposed between a winding barrel 32 of a motor 31 mounted on to the 1-numbered pier and the 2-numbered pier; another wire 35 interlocked with the wire 33; and a pulley 34.
|
