ANIMAL TRAP
Two sets of jaws, each with its own trigger.
The trap carries two differently sized pairs of spring-loaded jaws on a crossed base, offset so the smaller pair nests inside the larger pair when both are open. An animal that depresses the treadle releases a latch, and the larger jaws snap closed through a ninety-degree arc. The smaller jaws are held open by a U-shaped retaining piece attached to the anchoring chain; when the chain is put under tension, the retainer disengages and the second pair of jaws closes independently.
“Compound traps of this general type have been produced, but so far as I am aware they have always been made with the two sets of jaws arranged concentrically. In this latter arrangement, there are certain inherent disadvantages adversely affecting the efficiency of the trap, and to avoid these disadvantages is the principal object of the present invention.”— Walter A. Gibbs, from the specification
And the world did not beat a path to his door.