Input: yellow slider. Axial force F2 is applied to it.
Output: green slider. Axial force F1 represented by the pink spring is applied to it.
Red balls (circularly arranged, but here only two are shown) are in contact with inner cone of the yellow slider, outer cones of the green slider and the grey shaft.
F2 = F1.(2.tg(A).tg(B)) / (tg(A) + tg(B))
A: vertex angle of the outer cones.
B: vertex angle of the inner cone.
Because B is chosen small, F2 is considerably smaller than F1. For example:
A = 60 deg.; B = 5 deg. then F2 = F1/6
Advantage: It can be applied for rotary parts.