| 摘要 |
1. Pneumatic drill for driving in and pulling out of steel sheet piles from the ground, consisting of a ram, plate control valve, control block, and a body, characterised by the fact that the side supporting arms (17) are attached to the side walls of the body (1), and the pilot sleeve (2), equipped with the top exhaust ports (20) and bottom exhaust ports (22) that are covered by a rotating control ring (16), is mounted inside the body (1), where in the top part a shock absorber (19) is hinged that is made of two spherical progressive springs (21), and the control block (12) has a cylindrical valve inside (14) that is equipped with a double-armed lever (15) and with strands (16) on its end.<IMAGE>
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