Locking mechanism

1. A locking mechanism for a shaft comprising:

a first cylinder having at least a portion of an inside diameter approximately equal to an outside diameter of the shaft allowing for the cylinder to slide freely on the shaft, the first cylinder having at least one hole;

at least one ball retained in the at least one hole of the first cylinder, the hole allowing a projection of the at least one ball into an interior of the first cylinder and small enough to retain the ball in the hole;

a tensioning ring in the form of a second cylinder at least partially overlapping the first cylinder and having an inside diameter approximately equal to an outside diameter of the first cylinder at one end of the second cylinder and at least a portion of the inside diameter increasing in diameter toward an opposite end of the second cylinder, the second cylinder serving to retain the at least one ball within the at least one hole of the first cylinder;

a biasing mechanism acting against the second cylinder in a first direction to urge the at least one ball into the interior of the first cylinder in order to frictionally engage the cylindrical shaft; and

a release mechanism movable with the biasing mechanism and manually actuated against the bias to move the second cylinder in a second direction opposite the first direction to allow the at least one ball to freely move within the at least on hole and allow the locking mechanism to be slid onto and removed from the shaft, the release mechanism having

at least one pair of handles of which one or both handles are rotatable toward or away from another of the handles to manually actuate the release mechanism,

a first body fixed relative to the tensioning ring having peripheral cam surfaces,

a second body fixed relative to the first cylinder having mating cam surfaces such that when the first body is rotated relative to the second body the peripheral and mating cam surface ride up one another to move the locking mechanism from a locked condition to an unlocked condition.

2. The locking mechanism of claim 1 , wherein the peripheral cam surfaces and mating cam surfaces are configured to direct the release mechanism to a locked position when the at least one pair of handles are not being manually rotated toward or away from one another.

3. The locking mechanism of claim 1 , wherein one or more of the peripheral cam surfaces and mating cam surfaces are comprised of plurality of separated projecting members.

4. The locking mechanism of claim 1 , wherein the at least one ball includes at least six balls and wherein the first cylinder has at least six holes, each hole of the at least six holes retaining a ball of the at least six balls.

5. The locking mechanism of claim 1 , further comprising at least one indicium allowing determination of a user by a minimum of visual inspection whether the locking mechanism is in a locked position or an unlocked position, a visibility or appearance of the at least one indicium changing between the locked position and the unlocked position.

6. The locking mechanism of claim 5 , wherein the at least one indicium is on the at least one pair of handles.

7. The locking mechanism of claim 1 , further comprising a second release mechanism movable with the biasing mechanism and manually actuated against the bias to move the second cylinder in the second direction opposite the first direction to allow the at least one ball to freely move within the at least one hole and allow the locking mechanism to be slid onto and removed from the shaft, the second release mechanism being actuated by a pushing force.

8. A weight and locking mechanism combination for attaching the weight to a shaft comprising:

a weight; and

a locking mechanism integrated with or attachable to and detachable from said weight, said locking mechanism positionable between said weight and shaft for securing said weight to said shaft, said locking mechanism having an opening extending from a top side to a bottom side for receiving said shaft; wherein the locking mechanism comprises a first cylinder having at least a portion of an inside diameter approximately equal to an outside diameter of the shaft allowing for the cylinder to slide freely on the shaft, the first cylinder having at least one hole; at least one ball retained in the at least one hole of the first cylinder, the hole allowing a projection of the at least one ball into an interior of the first cylinder and small enough to retain the ball in the hole; a tensioning ring in the form of a second cylinder at least partially overlapping the first cylinder and having an inside diameter approximately equal to an outside diameter of the first cylinder at one end of the second cylinder and at least a portion of the inside diameter increasing in diameter toward an opposite end of the second cylinder, the second cylinder serving to retain the at least one ball within the at least one hole of the first cylinder; a biasing mechanism acting against the second cylinder in a first direction to urge the at least one ball into the interior of the first cylinder in order to frictionally engage the cylindrical shaft; and a release mechanism movable with the biasing mechanism and manually actuated against the bias to move the second cylinder in a second direction opposite the first direction to allow the at least one ball to freely move within the at least on hole and allow the locking mechanism to be slid onto and removed from the shaft, the release mechanism having at least one pair of handles of which one or both handles are rotatable toward or away from another of the handles to manually actuate the release mechanism, a first body fixed relative to the tensioning ring having peripheral cam surfaces, a second body fixed relative to the first cylinder having mating cam surfaces such that when the first body is rotated relative to the second body the peripheral and mating cam surface ride up one another to move the locking mechanism from a locked condition to an unlocked condition.