PURPOSE: To prevent the subject working machine from running unexpectedly and increase the safety by providing a non-contact type operator existence sensor for detecting whether a standing operator is existing near a steering handle, and automatically stopping a machine body upon detecting the non existence of the operator.
CONSTITUTION: A crawler walking type mower has an engine start key switch 9, a cutter clutch lever 10 for turning on and off drive power, and a travel clutch lever 11 for turning on and off power transmission to a rear wheel respectively on a frame 8 extended between a pair of right and left steering handles 7 and 7. ln this case, a supersonic sensor is so fitted to the intermediate part of the frame 8 as to be directed aft as an operator existence sensor 12. In addition, when a transmitted signal wave from the supersonic sensor 12 does not return with the travel clutch lever 11 turned on, or a reflected wave is detected in or after the predetermined time, a control device judges that there is no operator M near the steering handles 7, and interrupts fuel supply to an engine for stopping the operation thereof.
| JPS5861687 | 【考案の名称】管理機のハンドル取付構造 |
OSHIMA HIROSHI
OKURA HIDEO
SADAKANE HIROBUMI
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