Abstract: 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.

Abstract: A wing plow for use with a main plow has a scraper blade and a fixed moldboard mounted on the top edge of said scraper blade for the inner portion of the wing plow and a flexible moldboard sheet member joined to said rigid moldboard section and extending to the discharge end of said wing plow. An adjusting arm and hydraulic cylinder are connected to the top corner of the outer end of the flexible sheet to independently position and contour the discharge end of said sheet to control the discharge of material from the wing plow.

Abstract: A moldboard assembly having a flexible moldboard sheet joined along its bottom edge to a scraper blade unit so that material passing over the blade is directed into contact with the sheet. One top corner of the sheet is fixed to a side plate and an adjusting arm is secured to the other top corner of the sheet and is independently positioned to contour the sheet to any desired shape whereby the flow of material through the assembly can be accurately controlled.

Abstract: A moldboard assembly having a flexible moldboard sheet joined along its bottom edge to a scraper blade unit so that material passing over the blade is directed into contact with the sheet. Adjusting arms are secured to the top corners of the sheet and are independently positioned to contour the sheet to any desired shape whereby the flow of material through the assembly can be accurately controlled.

Abstract: A locking mechanism for a fluid actuated snowplow which automatically locks the moldboard unit of the plow in a desired position and simultaneously therewith relieves the pressure on the fluid drive unit whereby the locking mechanism and not the drive unit accept the plowing stresses.