PIVOTED ARM FOR LOWERING UNDER A SLAB

摘要

An instrument (1) is guided by a pivoted arm (11) as it is lowered into a pit with a narrow opening (4). Said pivoted arm is pivoted on a dolly that moves on the periphery of the opening. The rotation of the arm that follows this movement and the pivoting of the lower section (13) about the joint (14) position the instrument (1) directly over the desired location with a simple command, said location being expressed in terms of polar coordinates. The invention is suitable for taking samples and for carrying out tests in pits containing dangerous waste.