Stable pivotal tilt adjustment for a projectile expelling apparatus with a launch tube

A tilting projectile expelling apparatus supported for operation by a supporting stand, the tilting projectile expelling apparatus comprising:

• a launch tube having a longitudinal axis, an ingress end, an exit end and a drive wheel opening;
• a motor connected to a drive wheel, at least a portion of the drive wheel extending through the drive wheel opening, the motor for rotating the drive wheel;
• a feeder elbow disposed to abut the ingress end of the launch tube, the feeder elbow comprising an entry end, an egress end, and a pivot axis, the pivot axis being transverse to the longitudinal axis of the launch tube;
• and
• a pivot adjustment assembly disposed at the pivot axis connecting the feeder elbow to the supporting stand in rotational tilting engagement, pivot adjustment assembly comprising an anchoring transverse column connected to the feeder elbow and having a longitudinal axis coincident to the pivot axis, a pivot axis bolt that is anchored to the anchoring transverse column along the pivot axis, a receiving disk through which the pivot axis bolt passes, and a rotatable handle that receives the pivot axis bolt in tightening/loosening engagement, pivot adjustment assembly having a tiltable mode wherein the pivot adjustment assembly facilitates the tilting of the feeder elbow about the pivot axis and a non-tiltable mode preventing tilting of the feeder elbow about the pivot axis, pivot adjustment assembly is in the non-tiltable mode when tightened and is in the tiltable mode when loosened.