I have created a solid ring using the sweep command. I would like to cut it into four pieces. I have created a surface with the right shape to use for this cutting. I placed one of the cutting surfaces in the ring and then reproduced it into the correct locations using a circular array command. However, I can't get these surfaces to cut the ring into four pieces. I just want four pieces with relatively square ends, but when I try to cut the ring it gets cut in very strange ways. I've tried the trim command and the boolean command but neither works. I guess I've done something strange in creating the ring, but I don't know what or how to create the ring correctly.

I'm attaching the drawing page with the ring. Can someone please help me.
Thanks,
Mark