@ rozzzzz & metalhead
The seat belt lock become functional when its pull hard and that is the case of accident my friends.
""" In 1946 Dr. C. Hunter Shelden had opened a neurological practice at Huntington Memorial Hospital in Pasadena, California. In the early 1950s Dr. Shelden had made a major contribution to the automotive industry with his idea of retractable seat belts. This came about greatly in part from the high number of head injuries coming through the emergency rooms. He investigated the early seat belts whose primitive designs were implicated in these injuries and deaths. His findings were published in the November 5, 1955 Journal of the American Medical Association (JAMA) in which he proposed not only the retractable seat belt, but also recessed steering wheels, reinforced roofs, roll bars, door locks and passive restraints such as the now-and-ever-popular air bag.
Subsequently in 1959 Congress passed legislation requiring all automobiles to comply with certain safety standards. """