| 摘要 |
Safety apparatus for use in a moldboard assembly having a plurality of horizontally aligned trip blade units pivotally supported in the bottom of the moldboard frame so that the units move independently between a downwardly extended operative position and a rearwardly extended, fully tripped position. A biasing mechanism urges each unit into the operative position with a predetermined amount of force. A control mechanism further regulates the biasing force exerted on each unit so that the biasing force first increases as the unit moves out of the operative position and then decreases as the unit continues to move into the fully tripped position. The force exerted on each unit when in the fully tripped position is considerably less than that used to hold the unit in the operative position thereby preventing the assembly from lifting as it moves over an obstacle.
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