what’s the idea behind the French coup de poing?

Coup de poing is a small knife used to open oyster.
Typically the folks at the coast in france carry it with there keys to be ready for an oyster anytime 😃
The rather short bully shape of the blade gives it the needed strength to pry open a oyster
 
@kamagong :
Also known as cra-cra, Eustache etc.. it is a way older pattern than Okapi, a peasant's knife made everywhere in France, Nogent, Nontron, Coupe du rasoir-Lézard, Couvreux 23, Au Lion, St Joanis in Thiers, J. Charasse in Perpignan, Henseling in Toulon. This was one of the most produced pattern and 46000 were requisitioned to be issued to French soldiers in 1914 until 1915.
CorpsfrancDivisionnaire10mai1915.jpg
© l'Addiction Coupante



No need to dismantle. It is a Mongin, sole maker today. It exists in 6,8 and 10cm (closed length) and various materials. Quite dangerous if you do't have the knack to close it. Maybe the name comes in that it is safer to close it pushing the blade against something solid while opening the ratchet.
View attachment 1662476

Not too hard to close one-handed, actually. Use a finger through the ring and lift up while pressing down and folding the knife with thumb on the spine and fingers on the handle.
 
So, if I understand, the ring is to help to pull the back spring or just slightly bend the spring to remove the tension on the tang of the blade? Is there a hole in the spring where a notch on the tang of the blade slips into the hole when open?
On the Okapis, the front edge of the spring is bent down to engage a notch on the tang.
 
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