Like pocket screws, traditional pinch dogs are a great way to join odd assemblies or to use them in conjunction with clamps. A typical use is to drive them into the ends of a panel while the woodworker uses a bar clamp to secure the middle. (The middle is typically sprung, but that’s another entry.)
Pinch dogs come in a lot of shapes and sizes, but they are essentially a pair of conjoined steel wedges. You hammer the tips of the wedges into the two adjacent surfaces you want to join. The two wedges pull the joint tight.
They work great. Or rather, they used to work great. No, the laws, of simple mechanics haven’t been suspended. But I’ll get back to this point in a bit.
Today I used pinch dogs to pull together the two pieces of an arm for a stick chair. As these arm pieces are curved and covered in compound angles, a simple clamp wouldn’t do the job without some additional fussing.