stresses of tightening a rotating arm

karen_lorr

What are the forces involved in seccuring the clip.
(Sorry about the graphics - I’m not very good at them)
The object is to close the clip (as in D) by rotating an arm attached to the clip.

See attchement (sorry I don't know how to add it to this question)

In A the 2 sections of the clip are open
In B the clip is past over the hook
In C the arm is forced back to tighten the clip
In D the clip is locked.

But, I would think the at C - due to the arm rotating about is center, the clip is at it’s tightest, and it is loosened in D - when it's really ment to be at it tightest ?
If this is true what are the physics/mechanics involved in this (seemingly) simple process.

Thank you

Attached Thumbnails