| 摘要 |
An intermediate element (10) with a disengageable connection (7A, 14, 16) of the expansion type is provided between the piston (6) and the rod (7); a tubular component (18) is capable of establishing said connection, is in frictional contact with the inner surface (5A) of the barrel (5) and is capable of being moved by the piston (6) when the latter is made to slide in the direction (f1) of suction and thus maintains the connection between the piston (6) and rod (7); the disengagement is caused by the injection stroke, when said tubular component (18) continues to be retained by friction on the inner surface (5A) of the barrel (5) and the rod (7) can thus be disengaged from the piston.
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