Morgoth's Curse: Self-sustaining or inescapeable?

I am confused as to the exact nature of the Curse. Of course we know that through the Ring, a device, Sauron used to corrupt the peoples of Middle-earth. When Gwindor tells Turin that the doom or curse lies within himself and not his name, I assume that would mean his spirit, correct? What exactly is the Curse which Morgoth sets about Turin and his kin? I do not see how Morgoth had the capacity to pass a spiritual Curse upon that house without the means of some physical device like Sauron's Ring. That physical device must come into contact with the physical Being(s). How is Morgoth able to marr a family even further than what he is normally able to through the corruption of ME? Did the seat which bound Hurin actually possess a mode or a device through which Morgoth could transport his Curse (only through the presence of Hurin?).

The seat high on the peaks of Thangorodrim seem more like a Judgment Seat reserved for Hurin, whereby Morgoth would inherit the right or power to judge Hurin and his house, thereby placing a curse upon Hurin because he had been mocked. Morgoth's judgment of right and wrong is perversed and crooked, so it would seem natural for Morgoth to place a Curse on that house.

I am confused on this subject. Any further thoughts?

Best regards