A 'Horseman's Knife' would be correct - but not the currently available one made from stainless, with the plastic handles.
It was the 'Multiplier' of its day - though not that many carried them, as they're too large for a pocket.
They're more of a saddlebag item, and always have been.
For the loose screw problem - clean the surfaces and apply Blue Loc-Tite or even Clear Nail Polish.
For jams - if you're bound and determined to use a screwdriver, then find a cheap pocket knife with a long-enough blade, snap off the tip, and flatten the edge.
Scouts Out!