Leaf spring
AssigneeRessorts Du Nord S. A.
InventorMichel Duchemin
Life of this patent
Estimating the term…
Abstract
A very light and high efficiency leaf spring made from a curved hollow tube with flattened opposite ends, cross section of said tube having a form which varies progressively from the center part of the tube towards each opposite ends but wall of the tube having the same area in any cross section throughout the length of the leaf.
Claims3
A leaf spring comprising at least one curved tubular shaped leaf consisting in a hollow tube having a wall, an inner cavity, two opposite ends which are flattened in section and cross-section, said cross-section having a shape which varies substantially throughout the length of the leaf, the wall having a perimeter which is constant and a thickness which is substantially constant in each cross-section throughout the length of the leaf, wherein at least one portion of the tubular leaf adjacent one of said flattened ends is notched laterally on two opposite sides and defines two superimposed tab portions which are curved in opposite directions so as to constitute each one half of a fastening eye, and means are provided to connect together the ends of said two tab portions, a cylindrical tube inserted between the two curved tab portions at each end of the tubular leaf, said means being welding, and lateral reinforcing ribs on each tab portion.
Dependencies are inferred from the claim text.