08-17-2010, 03:23 AM
The spring action comes from the pin part itself, on the opposite side of the pivot. If you look, what happens is that little projection above the crossbar presses into the base of the arch, and prevents the pin from rotating further. If the fibula is cast correctly, the point of the pin will not quite reach the clasp. It will have to be bent slightly to fit into the folded part.
The fibula is cast in two parts, the arch and the pin. The crossbar (on the arch piece) has a notch in the middle slightly wider than the pin's thickness. The crossbar has a hole cast into it that goes through the whole thing, and lines up with the hole in the pin. Then a rod is pushed through the holes, and peened on the two ends. If you look at the photo carefully, you can see that the "end" of the crossbar is actually a different metal, perhaps softer.
Does that make sense?
The fibula is cast in two parts, the arch and the pin. The crossbar (on the arch piece) has a notch in the middle slightly wider than the pin's thickness. The crossbar has a hole cast into it that goes through the whole thing, and lines up with the hole in the pin. Then a rod is pushed through the holes, and peened on the two ends. If you look at the photo carefully, you can see that the "end" of the crossbar is actually a different metal, perhaps softer.
Does that make sense?
M. Demetrius Abicio
(David Wills)
Saepe veritas est dura.
(David Wills)
Saepe veritas est dura.
