| 摘要 |
A reel is rotatably mounted on a reel frame and has a length of belt attached thereto. A track is mounted on the vehicle body and has the reel frame mounted thereon for translation along the track from a retracted position to an extended position. A high effort spring acts between the reel frame and the track to provide high effort retraction of the reel frame and the reel to the retracted position. A low effort spring acts between the reel frame and the reel to provide low effort retraction of the belt toward a wound condition on the reel and permit extension of the belt therefrom. A latch acts between the reel frame and the track to latch the reel frame at the extended position in response to the full unwinding of the belt from the reel and full travel of the reel frame along the track to the extended position. Accordingly, when the latch latches the reel frame to the track, the belt is subjected to only the effort of the low effort spring. A release releases the latch in response to a subsequent full unwinding of the belt from the reel and consequent further movement of the reel frame toward the extended position to thereby permit the return of the belt to the fully retracted position by the retraction efforts of the low effort spring winding the reel and the high effort spring retracting the reel frame along the track.
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