Hall effect seat belt tension sensor

B - Operations – Transporting – 60 – R

Patent

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Details

B60R 21/00 (2006.01) B60R 21/01 (2006.01) B60R 22/00 (2006.01) G01D 5/14 (2006.01) G01D 18/00 (2006.01) G08B 21/00 (2006.01)

Patent

CA 2311299

A tension sensor (10) for a vehicle seat belt (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 seat belt (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 seat belt (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 seat belt (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 seat belt (12). The Hall effect sensor (52) has an output (54) responsive to the magnetic flux therein.

Ce détecteur de tension (10) destiné à une ceinture de sécurité (12) d'automobile comprend une base (14) d'où partent deux blocs à goujons de guidage (16, 18), lesquels blocs portent une pluralité de goujons de guidage supérieurs (20) et inférieurs (22) assurant le guidage de la ceinture de sécurité (12). Un carter de piston (30) présentant un orifice (32) destiné à recevoir un piston mobile (40) est fixé sur la base (14). La forme de la partie supérieure (42) du piston (40) est conçue de sorte à permettre à la ceinture de sécurité (12) de passer avec un minimum de frottement sur le piston (40). Une pluralité de ressorts (46) est disposée entre la base (14) et le piston (40) de façon à amener le piston (40) à contrecarrer la force latérale de la ceinture de sécurité lorsqu'elle est tendue. Un aimant permanent (50) fixé sur le piston se place très près d'un capteur à effet Hall (52) dès que le piston (40) est enfoncé par la ceinture de sécurité (12). Le capteur à effet Hall (52) fournit une sortie (54) en réaction au flux magnétique qui s'y produit.

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