Patent ID: 8127471

Claim:
A plow comprising: a straight blade; a wing blade, with the wing blade coupled to an end of the straight blade, wherein a vertical axis is defined at such coupling; an actuator assembly coupled to the wing blade and the straight blade, with the actuator assembly configured to reciprocally move the attached wing blade from a first position longitudinally aligned with the straight blade to a second position in front of the straight blade that is angularly displaced more than 90 degrees from the first position; and a second wing blade coupled to another end of the straight blade and defining a vertical axis at such coupling and including a second actuator assembly coupled to the second wing blade and the straight blade with the actuator assembly configured to reciprocally move the attached second wing blade from a first position longitudinally aligned with the straight blade to a second position in front of the straight blade that is angularly displaced more than 90 degrees from the first position, wherein each actuator assembly comprises a wing actuator cylinder and a coil spring, with one end of each of the cylinder and the spring being coupled to a wing actuator rod, and the wing actuator rod being coupled to the wing blade and the straight blade.