The invention relates to a device comprising: a chassis (1) supporting the assembly； a telescopic column (2) including a lower fixed segment (5) that rotates about a vertical axis and at least one upper mobile segment (6)； and a telescopic arm (3) that moves along the length of the vertical column, the end of said arm supporting an X-ray generator head (4). According to the invention, the telescopic arm/head assembly can move from the lower position of the mobile column in the retracted position to the upper position of the mobile column in the extended position, and all of the movements of the column are manual, with the inclusion of a mechanical balancing mechanism comprising: a first mechanism formed by a spring, a pulley block and a variable-radius pulley, all housed in the fixed segment of the column； and a second balancing mechanism formed by a return pulley and a two-radii pulley that balances the weight between the cable inlet and the telescopic arm/head assembly.
