LATERAL JIB LOCKING DEVICE

摘要

A locking assembly for the telescopic jib of a crane, or mobile crane, includes a plurality of telescopic sections wherein locking pins are supported in an inner telescopic section and are biased outwardly by means of a spring for engagement within receiving apertures in an outer telescopic section surrounding the inner telescopic section. A release device is provided for engaging the inner end of a locking pin in order to release the locked position thereof against the spring biased. Preferably two locking pin are provided for each locking unit and are disposed on the inner telescopic section so that they will engage two oppositely located receiving apertures in the vertical side webs of the outer telescopic section. The engagement of the locking pins is located in the middle portion of the side webs where bending stresses are minimal, so that any weakening of the telescopic sections caused by the provision of the locking pin mounting structure and pin receiving portions will have negligible effect on the bending strength of the jib.