Left side jaw removed for clarity.
When the jaws are moved together they turn the smaller pinion gears which ratchet spring holds larger gears locked in position.
When ratchet release in lower right is pressed the larger gears are released allowing the return spring under the right side jaw to extend.
The two larger gears turn the smaller gears opening the jaws.
Note: In the image - because I have removed cover the spring force has pushed the right side gear to the right a bit. There is support for the right side gear in the cover that keeps these two gears lined up in mesh when assembled.
Mr. Mather Thank you so much for the reply, visually seeing it open brings much more clarity. you sir are an angel
As as soon as I figure out how to give you rep or however the point system works in this board I will do so, thanks so much again!