| 摘要 |
PCT No. PCT/SE84/00289 Sec. 371 Date May 13, 1985 Sec. 102(e) Date May 13, 1985 PCT Filed Sep. 5, 1984 PCT Pub. No. WO85/01217 PCT Pub. Date Mar. 28, 1985.A safety belt arrangement for protecting passengers in motor driven vehicles comprises a strap roller having a spindle mounted for rotation in a housing, a belt strap wound on the spindle, biasing means for urging the belt strap to wind on the spindle, a locking mechanism to lock the spindle against unwinding rotation, a detector for sensing a reference surface or surfaces on the spindle or on the belt strap and a memory device to register the time interval between signals received from the detector to determine the unwinding velocity of the belt strap and to activate the locking mechanism when a preselected value of the unwinding velocity of the belt strap is exceeded.
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