| 摘要 |
1. A rotary extension arm of a self-propelled heading machine, composed of a stationary part, connected tiltably in the horizontal and vertical planes with the chassis, and of a rotary part located within the stationary part, whereas the rotary part can rotate around its longitudinal axis and is fitted with a tool grip, characterised in that the housing (24) of the gear train (25) of the rotary element (5) with the drive engine (30) is mounted disjoinably on protrusions (26) of the stationary element (1), whereas the output component (27) of the gear train (25) is directly seated on the rear segment of the rotary part (5).<IMAGE>
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