| 摘要 |
Improvements according to which, between the two respective annular assemblies 1 and 2, which, in an intermediate manner, include the dies for threading 3, means 10 are incorporated, said means being provided with a movable element 14 whereby it is capable of establishing a rotary blocking or unblocking between the aforesaid annular assemblies 1 and 2, with possibility of a positional variation of the corresponding stop in the blocking situation, between two possible positions, in order to permit a certain relative rotation between both assemblies 1 and 2, by virtue of which an aperture displacement of the dies 3 is achieved so that they cease to act on the threaded element. <IMAGE>
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