PURPOSE: To improve the working efficiency of a lawn mower by interlocking the motion of 2nd and 3rd hydraulic cylinders with the motion of a 1st hydraulic cylinder and automatically changing the 2nd and 3rd hydraulic cylinders from floating state to a neutral locked state.
CONSTITUTION: Each hydraulic cylinder 11, 43, 44 is set in a floating state in the mowing operation to allow each mower 9a, 9b, 9c to vertically move while contacting with the ground to enable the mowing operation at a sufficiently large mowing width in high efficiency. The hydraulic pressure control of the 2nd and the 3rd hydraulic cylinders 43, 44 is carried out by an electromagnetic valve mechanism V1 to enable the lifting of each mower with separately controllable operation tools SW1, SW2. Mowing work at a narrow mowing width can be performed by lifting and housing a part of the mower. The valve mechanism V1 is automatically switched to a neutral locked state with an automatic switching means A interlocked with the switching of the 1st hydraulic cylinder 11 from the floating state to a lift driven state. All mowers are collectively lifted to enable the lifting of each mower by a single operation.
OSHIMA YASUHIRO
MIYATA JUNJI
FUJIWARA KOJI
