| 摘要 |
The invention relates to an expandable cylindrical mandrel for a winding machine, having at least one contracted state and one expanded state, having a longitudinal axis (1) and including a mandrel body (3) having a nose (5) and a rear (7) including a tubular sleeve (9), segments (11), rack means (13) capable of a longitudinal displacement producing a transverse displacement of the segments (11) with respect to the longitudinal axis (1), a control shaft (15) controlling the longitudinal displacement of the segments (11), closure bars (17) placed parallel to the longitudinal axis (1), between the segments (11) and in contact with them, a pinching bar (23) and a drive shaft (2). The nose (5) and the rear (7) of the body of the mandrel (3) each include an annular surface (39, 41) ensuring leaktight contact between the body of the mandrel (3) and the segments (11) on the one hand, and the closure bars (17) and the pinching bar (23) on the other hand. <IMAGE>
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