| 摘要 |
PURPOSE: To allow a worker to keep a stable working state by controlling electrically a connecting device with a lever operated in relation to a motion of lock shaft so as to set a hand rest state in a state of usual work and to set a hand hold state on a rough land form. CONSTITUTION: When a worker on an operating cab of an agriculture tractor turns a lever 66 backward, a lock shaft control wheel 42 is turned clockwise till the lever engages with a tab 18. After that, even when the lever 66 is detached, the tab 18 keeps the wheel 42. When the wheel 42 is at this position, a signal from a potentiometer as a command to lift up a connecting device is given to a connection control system. When the Jeer 66 is moved forward, the lever 66 is connected between wheel 42, 88 with friction, the wheel 42 is turned counter clockwise and the potentiometer provides an output of a command to lower the connecting device. The regulation limit when the lever 66 and the wheel 42 are moved forward depends on a stopper 96 projected from the wheel 82 and locked to the lever 66. |
