TELESCOPING BOOM WITH ROTARY EXTENSION AND LOCKING SYSTEM

A telescoping boom (20) includes a boom actuator (28) having a fixed part and a movable part, the movable part configured to move along a length the fixed part, a rotary actuator ((40) operably connected to the movable part and configured to rotate relative to the movable part, a coupling pin (46) connected to and configured to rotate with the rotary actuator, and a telescoping boom having a plurality of boom sections including a base section and one or more telescoping sections configured for telescoping movement along a longitudinal boom axis relative to the base section. A rotary extension and locking system (200) is mounted on at least one telescoping section and is configured for selective coupling to the boom actuator and selective locking with a nearest outwardly adjacent boom section. The rotary extension and locking system comprises: a coupling ring (202) rotatably mounted on the telescoping section; a section pin (204) operably connected to the coupling ring; and a latch (206) configured to selectively engage the section pin. T he coupling pin engages the coupling ring in response to rotation of the rotary actuator in a first direction.