| 摘要 |
<p>The apparatus comprises a carrier frame (1) supporting a pendular element (18) along which a mass (19) may slide and of which the displacements are effected by means of a cable (20). The pendular element (18) includes a tubular structure which is longitudinally divided into two parts (24, 25) each comprising at least two guiding surfaces of two opposite areas of the mass (19) so as to provide themselves for the longitudinal guiding of the mass, and linking means (33, 38) of said two parts with free longitudinal sliding of one of the parts with respect to the other. The invention may be particularly applied to the driving into the ground of studs with a central sleeve.</p> |
