| 摘要 |
The invention proposes an arrangement (10) of the type in which the unit comprises a controlled member (70) for locking the immobilizing lever (34), characterized in that the immobilizing member is a member which is controlled manually by a first "on" push-button (70) mounted to slide between a pushed-in "on" position in which the immobilizing lever (34) is locked in the immobilizing position, and an "out" position of rest, and in that there is a retaining mechanism (104, 120, 118) for automatically keeping the first push-button (70) in the "on" position, the release of which is controlled by a second "off" push-button (94) which is mounted to slide between an "out" position of rest and a pushed-in "off" position in which the first "on" push-button (70) is free to slide.
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