| 摘要 |
PROBLEM TO BE SOLVED: To provide a safety belt retractor which is capable of mitigating the impact on the occupant and belt by immediately letting out a little section of belt even if the occupant suddenly bends down forward without having a time lag from the moment at which the belt is tightened by a belt tensionner to the moment at which the belt reel is unlocked. SOLUTION: When a belt (14) is to be tightened by a belt tensionner, rotation is transmitted from a traction cable (18) through a first connection mechanism (22 and 24), a cylindrical ring (32a) and a torsion bar (30) to a belt reel (12) to take up the slack of the belt. In this case, with the aid of the reaction of the belt, the reel, the torsion bar froming the shaft of the reel and an inner ring (32) of a second connection mechanism elastically attached to the end of the torsion bar are pulled up the let the teeth of the inner ring engage with the teeth of an outer ring (40). Since the first connection mechanism and the second connection mechanism are being engaged with each other, when a force is applied to the belt in the letting-out direction, the torsion bar (30) is twisted in result so that impact is absorbed. |
