I had to replace the hinges on my table. I found somone who worked for a hardware Co in Georgia, who got them for me. I have since seen them in several websites. An example above.
I needed to remake the recess to fit the new hinge, as its dimensions were slightly off what the old ones fit. That was about 10 yrs ago and they have performed flawlessly. I think the originals were too flimsy for the task, hence the failure.