12-01-1984 дата публикации
Номер: DE0003225973A1
Принадлежит:
The invention relates to a fail-safe pneumatic spring, in particular for engine bonnets and/or boot lids of motor vehicles, in which a retention device acting in the retracted position of the piston rod is provided which is operative after a predetermined retraction travel of the piston rod into the cylinder and prevents an automatic extension movement of the piston rod. Such a retention device is intended to prevent the pneumatic spring from representing an additional safety risk in the event of deformation of parts of the vehicle due to an accident. According to the invention, the intention is to further develop such a pneumatic spring by arranging in the piston head a hollow, the area of which, projected into the plane of the piston head, is at least as large as the cross-sectional area of the piston rod, and by a correspondingly shaped projection projecting from the cylinder head, which projection, when the predetermined retraction travel has been reached, covers this area in sealing ...
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