Patent ID: 8333367
Filing Date: 2012-12-18
Classification: F16F

Abstract:
1. A pneumatic spring comprising: a pneumatic chamber comprising a cylindrical wall which is expansible and contractible along an axial direction and which has opposite axial ends each closed by a respective closure, one of the closures comprising an outer circular plate and an inner reinforcement bar, the outer circular plate having a flat interior surface, the inner reinforcement bar having a length and a width and being disposed within the pneumatic chamber against the flat interior surface of the outer circular plate such that at a middle of the inner reinforcement bar's width the inner reinforcement bar's length lies on a diameter of the outer circular plate, the inner reinforcement bar being joined to the outer circular plate to endow the one closure with a moment of inertia along the diameter of the outer circular plate which is greater than that of the outer circular plate alone, the inner reinforcement bar's length stopping short of a perimeter of the outer circular plate, the inner reinforcement bar comprising a corrugated wall having a surface which is disposed flat against the flat interior surface of the outer circular plate and which comprises separate, parallel zones which are interrupted by depressions in the corrugated wall and which run lengthwise of the inner reinforcement bar to either side of the middle of the inner reinforcement bar's width.