Abstract: A clamping mechanism is provided for mixing apparatuses and other apparatuses that utilize clamping mechanisms. The clamping mechanism incorporates a clutch mechanism which prevents overtightening of the clamp mechanism in the closed or clamping direction. Also, the clamping mechanism incorporates a plurality of pins that serve as a stop to prevent the traveling arm of the clamp mechanism from being tightened against the stationary arm and further serve as a bias for the clutch mechanism to bias the male and female clutch components into a mating engagement thereby enabling the clamping mechanism to be easily rotated out of the fully open position and prevent a jamming of the clamping mechanism in the fully open position.