US 11,879,516 B2
Variable stiffness magnetic spring
Jonathan Bird, Portland, OR (US)
Assigned to Portland State University, Portland, OR (US)
Filed by Portland State University, Portland, OR (US)
Filed on Aug. 18, 2020, as Appl. No. 16/996,790.
Claims priority of provisional application 62/888,992, filed on Aug. 19, 2019.
Prior Publication US 2021/0054897 A1, Feb. 25, 2021
Int. Cl. F16F 6/00 (2006.01)
CPC F16F 6/005 (2013.01) [F16F 2222/06 (2013.01); F16F 2228/066 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A variable stiffness magnetic spring comprising:
a first plurality of magnets arranged in a first ring;
a second plurality of magnets arranged in a second ring; and
a third plurality of magnets arranged in a third ring, wherein:
the first ring is rotatable relative to the second ring,
the first ring is positioned between the second ring and the third ring along an axis of rotation of the first ring, and
the first ring is translatable relative to the second ring or the second ring is translatable relative to the first ring.