Fahnestock
http://www.mouser.com/catalog/621/952.pdf
The ubiquitous "no tool" speaker connectors (and the no-tool terminal
blocks) are more impressive, but they had to wait for plastic
injection molding to be invented.
I like the way RCA did the speaker terminals on my boom box. They
look like the 2nd set of spkr terms on that Mouser page, but no
solder terminals.
The PCB slides into a notched out or cut out looking version of the
terminal so it's up against the spring clamp, which IIRC is a metal
contact, but it could just as well be an insulator.
The wire goes thru the hole and lays on a PCB pad. When you release
the lever, it clamps the wire down to the PCB.
Smart and cheap, but a slight PITA to slide it all together.
Sometimes the ME that goes into an electronic product/part is as
impressive as the circuit/part itself.