Patent ID: 7625151

Claim:
A coupler system comprising: a first head component comprising a first drive and a cam comprising a cam engagement surface; a second head component comprising a second drive and a wall defining a recess, wherein the second head component is positioned relative to the first head component such that the first drive and second drive are maintained in a substantially coaxial relationship about a rotation axis and the wall and the cam are adjacent to one another, wherein the first head component is rotatable relative to the second head component within the recess about the rotation axis; and a first fastener comprising a first end and a second end, wherein the first fastener protrudes through and is held relative to the wall, wherein the second end is adjustable such that adjusting the second end causes a change in a length of the first end protruding from the wall into the recess, wherein the first end contacts and applies a force against the cam engagement surface rotating the cam in the recess such that the angle of the first head component changes relative to the angle of the second head component about the rotation axis based on the change in length of the first end protruding from the wall toward the cam; and a first tube coaxial with and non-rotatably engaged with the first drive and a second tube coaxial with and non-rotatably engaged with the second drive, wherein the change in angle of the first head component relative to the angle of the second head component causes the angle of the first tube to change relative to the angle of the second tube about the rotation axis, wherein rotation of the first head component relative to the second head component causes rotation of the first tube relative to the second tube.