Drilling rod, for mining operations, for example, has locking bar installed on second drill column's end and hinging between released position and locking position protruding over outer circumference of second drill column

摘要

On the second drill column's end for fitting in the sleeve(12) of the first drill column(10) a locking bar(18) is installed and hinges between a released position and locking position protruding over the outer circumference of the second drill column(13). In this way the locking bar, when a tensioning force is exerted upon the first drill column and sleeve, bears by a locking protrusion(19) against a support face(27) cut out on the inner side of the sleeve, and which by means of an unlocking shoe(24) is hinged inwards into its released position against the force of a spring(23) preloading it into the locked position.