Abstract: A boom assembly has an upright stand with a vertical hollow post and on top of which is mounted an elongated hollow boom adjustable in orientation in both vertical and horizontal directions. A linear extention member for the boom is also in the form of a hollow tube. The stand includes a plurality of legs each in the form of a hollow tube and there are a plurality of foot elements such as casters. The different parts of the assembly are secured together by couplings that preferably are the same in each case. Such couplings include a hollow body with an exterior surface of a size and shape to be inserted within an adjacent hollow tube. A pair of laterally-opposite slots continue longitudinally inward from one end of the body. A lateral spreader is of a size and shape to be located within that one end of the body. A lever has one end portion inserted within the spreader to effect spreading thereof upon lateral deflection of the other end of the lever.