| 摘要 |
A crane (10) has a boom (20) with a rotatable boom section connection system. The crane (10) has an upper works (12) rotatably mounted on a lower works (11), the upper works (12) including a load hoist winch. The boom (20) comprises at least a first and second boom section each with a longitudinal axis and a first and second end, the second end of the first section being coupled to the first end of the second section. At least one male connector (37) on the second end of the first section is coupled to a female connector (36) on the first end of the second section. The male connector (37) comprises a base (52) and a protrusion (54), the base and protrusion each have an extension in a direction generally perpendicular to the longitudinal axis of the first boom section. The extensions and protrusion define a socket. The female connector (36) comprises two protrusions (74,76) spaced apart at a distance such that the protrusion (54) of the male connector (37) fits between the two protrusions (74,76). The female connector (36) further comprises a coupler (78) connected to at least one of the protrusions that extends toward the other protrusion. The coupler (78) fits within the socket of the male connector (37). A retainer connected between the extensions of the male connector (37) prevents the male and female connectors (36,37) from uncoupling. <IMAGE> |
