Patent ID: 7748744

Claim:
A seat belt through anchor comprising: a hanging shaft on which a seat belt withdrawn from a retractor is hung; an anchor base supporting the both ends of the hanging shaft, wherein the hanging shaft includes a shaft non-rotatably supported by the anchor base at both ends, and a tube body rotatably attached outside the shaft; a stopping mechanism for preventing rotation of the hanging shaft when a pressing force of a predetermined magnitude or more is applied to the tube body from the seat belt, wherein the stopping mechanism includes a projected portion formed on either of the outer periphery of the shaft or the inner periphery of the tube body, wherein a recessed portion is formed on the other of the outer periphery of the shaft or the inner periphery of the tube body, wherein the projected portion is engageable with the recessed portion, and a spring disposed between the tube body and the shaft, wherein the spring applies a force to the tube body such that the recessed portion and the projected portion are separated from each other, when the pressing force applied to the tube body from the seat belt is smaller than the predetermined value; and wherein, in the case when a pressing force of the predetermined value or more is applied to the tube body from the seat belt, the tube body approaches the shaft, and the projected portion and the recessed portion are mutually engaged, and thereby the rotation of the tube body is prevented.