| 摘要 |
A tension sensor (10) for a vehicle seatbelt (12) comprises a base (14) having a pair of guide pin blocks (16) and (18) depending therefrom, and a plurality of spaced upper and lower guide pins, 20 and 22 respectively, for guiding the seatbelt (12). A plunger housing (30) having an orifice (32) therein for acceptance of a movable plunger (40) is secured to the base (14). The plunger (40) has an upper portion (42) shaped to allow the seatbelt (12) to travel over the plunger (40) with minimal friction. A plurality of springs (46) are disposed between the base (14) and the plunger (40) to bias the plunger (40) against the lateral force of the seatbelt (12) when under tension. A permanent magnet (50) secured to the plunger moves into close proximity to a Hall effect sensor (52) when the plunger (40) is depressed by the seatbelt (12). The Hall effect sensor (52) has an output (54) responsive to the magnetic flux therein.
|
