| 摘要 |
<p>A vehicle safety belt pre-tensioning system (1) includes a slider (9) to which a cable (13) is attached. The slider (9) is affixed to a safety belt buckle (10) and to a cable (13) for pulling the buckle (10) forcibly downward to secure a seat occupant upon occurrence of an emergency condition. The cable (13) is arranged parallel to a guide groove (8) of a guide plate (7) and is guided into a sensor mechanism (2) via a roller (12). The other end of the cable (13) is affixed to a piston (52). A portion of the cable (13) is fixed in a tube (54) which is arranged in the sensor mechanism (2). The sensor mechanism (2) activates a trigger upon detecting an emergency condition. Between the sensor mechanism (2) and the piston (52), a coil spring (51) is held in a compressed state. Within the sensor mechanism (2), the tube (54) is retained by a pawl (33) which also contacts a link (35) which is positioned proximate a pin (39), or trigger, associated with a sensor mass (37). When vehicle motion indicatives an emergency condition, the sensor mass (37) moves so as to cause the pin (39) to break the link. Thus, the pawl (33) moves so as to release the tube (54). When the tube (54) is released the piston (52) is moved away from the sensor mechanism (2) by the sudden expansion of the compressed coil spring (51). This pulls the cable (13), causing the slider (9) and buckle (10) to be pulled rapidly downward, tightening a safety belt attached to the buckle (10) for securing the seat occupant. The assembly is attached to a side of an upper rail of a seat mounting. <IMAGE></p> |
