| 摘要 |
<p>Saw-tooth drive head comprises an outer cylinder (10) with an upper head section (11), an inner cylinder (20) arranged inside the outer cylinder and having an upper head section (21) and a closure cap (40) arranged on the base of the outer cylinder and having a passage (41) which fits the recess (12) of the outer cylinder. A drive rod (50) is inserted into the outer cylinder recess, the passage of the inner cylinder and the passage of the closure cap. Preferred Features: The closure cap has an inner protruding annular protrusion (42) with a positioning unit (43) on its periphery.</p> |
