Patent ID: 7401969

Claim:
A mixing vehicle, comprising: a frame; a discharge chute pivotally mounted relative to the frame to direct material discharged from the mixing vehicle; a pressure plate secured to move relative to a pivoting movement of the discharge chute; and a locking apparatus to secure the discharge chute at a desired position relative to the frame of the mixing vehicle, comprising: a base configured to be mounted to the frame; a first arm having a first clamping portion and a first air bag receiving portion, the first arm pivotally secured to the base between the first clamping portion and the first airbag receiving portion, the first clamping portion configured to contact the a first side of the pressure plate; a second arm having a second clamping portion and a second airbag receiving portion, the second arm pivotally secured to the base between the first clamping portion and the second clamping portion, the second clamping portion configured to contact a second side of a pressure plate; and an airbag secured at a first end of the airbag to the first airbag receiving portion of the first arm and secured at a second end of the airbag to the second airbag receiving portion of the second arm, the airbag configured to bias the first airbag receiving portion of the first arm and the second airbag receiving portion of the second arm apart upon inflation.