Abstract: Variations of an improved weight bar clamp are disclosed herein. A weight bar clamp includes a collar with two opposing walls that extend from a common end. The collar may be a one-piece collar or a multi-piece collar. The opposing walls may also include an arced interior surface and a plurality of structural ribs. The structural ribs extend in an arc partially between the common end and a terminating end of each opposing wall. The weight bar clamp may further include a biasing member that biases cam halves coupled to the opposing walls away from one another. The clamp further includes handle coupled to the cam halves. The clamp includes a cam opening configured to allow the cam halves to separate in an open position and push the cam halves toward each other in a closed position.

Abstract: A quick release clamp having two crescent halves coupled at one end by a hinge and a spreader spring at the opposite end. A cam follower is coupled to the spring end of the crescent halves and configured to receive a handle. A handle, containing a cam configured to engage the cam follower, which when parallel to the hinge does not engage the cam and the clamp is open, and when rotated a quarter turn engages the cam and closes the clamp.