Tension sensing assembly

• US 6,679,524 B2
• Filed: 05/29/2002
• Issued: 01/20/2004
• Est. Priority Date: 11/14/2001
• Status: Expired due to Term

• Current Assignee: Autoliv AB (Autoliv Incorporated)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Greib, Gary R., Miller, Thomas W.
• Primary Examiner(s): Dickson, Paul N.
• Assistant Examiner(s): ILAN, RUTH
• Application Number:
  US10/156,850
• Publication Number:
  US 20030089544A1
• Time in Patent Office: 601 Days
• Field of Search: 180/268, 280/801.1, 280/735, 324/200, 324/207.21, 324/207.2, 737/79, 738/623.91, 738/626.9
• US Class Current: 280/801.1
• CPC Class Codes: B60R 2022/4841 for sensing belt tension
• CPC Class Codes: B60R 21/0155 sensing belt tension
• CPC Class Codes: B60R 22/48 Control systems, alarms, or interlock systems, for the correct application of the belt or harness
• CPC Class Codes: G01L 5/103 using sensors fixed at one end of the flexible member

Abstract

A tension sensing assembly for a seat restraint system in a vehicle includes a housing and a movable mechanism disposed in the housing. The tension sensing assembly also includes at least one spring disposed in the housing and cooperable with the movable mechanism. The tension sensing assembly includes at least one magnet disposed in the housing and a Hall effect sensor disposed in the housing and cooperable with the at least one magnet. The tension sensing assembly further includes a cable extending through the housing and cooperable with the movable mechanism to move the movable mechanism to deflect the at least one spring. The movable mechanism moves the at least one magnet relative to the Hall effect sensor to change an output of the Hall effect sensor to indicate a tension level in the seat restraint system when the at least one spring is deflected.

Claims

1. A tension sensing assembly for a seat restraint system in a vehicle comprising:

a housing;

a movable mechanism disposed in said housing;

at least one spring disposed in said housing and cooperable with said movable mechanism;

at least one magnet disposed in said housing;

a Hall effect sensor disposed in said housing and cooperable with said at least one magnet; and

a cable extending through said housing and cooperable with said movable mechanism to move said movable mechanism to deflect said at least one spring, said movable mechanism moving said at least one magnet and said Hall effect sensor toward each other to change an output of said Hall effect sensor to indicate a tension level in the seat restraint system when said at least one spring is deflected.

2. A tension sensing assembly as set forth in claim 1 wherein said movable mechanism includes at least one spring pocket extending therein to receive one end of said at least one spring.

3. A tension sensing assembly as set forth in claim 2 wherein said movable mechanism includes at least one aperture extending longitudinally therethrough and communicating with said at least one spring pocket, said cable extending through said at least one spring and said at least one aperture.

4. A tension sensing assembly as set forth in claim 1 including an anchor plate connected to said housing.

7. A tension sensing assembly as set forth in claim 1 wherein said movable mechanism comprises a slider disposed in said housing.

11. A tension sensing assembly as set forth in claim 1 wherein said at least one spring is a coil spring tuned to a predetermined force.

5. A tension sensing assembly for a seat restraint system comprising:

a housing;

a movable mechanism disposed in said housing;

at least one spring disposed in said housing and cooperable with said movable mechanism;

at least one magnet disposed in said housing;

a Hall effect sensor disposed in said housing and cooperable with said at least one magnet;

a cable extending through said housing and cooperable with said movable mechanism to move said movable mechanism to deflect said at least one spring, said movable mechanism moving said at least one magnet relative to said Hall effect sensor to change an output of said Hall effect sensor to indicate a tension level in the seat restraint system when said at least one spring is deflected; and

an anchor plate connected to said housing, wherein said anchor plate includes at least one aperture extending therethrough, said cable extending through said at least one aperture.

6. A tension sensing assembly as set forth in claim 5 wherein said anchor plate is adapted to be connected to one of a buckle assembly of the seat restraint system, seat belt webbing of the seat restraint system, and the vehicle structure.

8. A tension sensing assembly for a seat restraint system comprising:

a housing;

a movable mechanism disposed in said housing;

at least one spring disposed in said housing and cooperable with said movable mechanism;

at least one magnet disposed in said housing;

a Hall effect sensor disposed in said housing and cooperable with said at least one magnet;

a cable extending through said housing and cooperable with said movable mechanism to move said movable mechanism to deflect said at least one spring, said movable mechanism moving said at least one magnet relative to said Hall effect sensor to change an output of said Hall effect sensor to indicate a tension level in the seat restraint system when said at least one spring is deflected; and

said movable mechanism comprising a slider disposed in said housing, wherein said slider has a protrusion extending longitudinally with an arcuate shaped longitudinal end, said cable extending around said longitudinal end.

9. A tension sensing assembly as set forth in claim 8 wherein said protrusion has at least one rib extending laterally therefrom for contacting said cable.

10. A tension sensing assembly as set forth in claim 8 wherein said at least one magnet is fixed to said slider and said Hall effect sensor is fixed to said housing.

12. A tension sensing assembly for a seat restraint system in a vehicle comprising:

an anchor plate adapted to be connected to one of a buckle assembly of the seat restraint system, seat belt webbing of the seat restraint system, and vehicle structure;

a housing connected to said anchor plate;

at least one spring disposed in said housing;

at least one magnet disposed in said housing;

a Hall effect sensor disposed in said housing and cooperable with said at least one magnet;

a slider disposed in said housing; and

a cable extending through said housing and said at least one spring and being cooperable with said slider to move said slider to deflect said at least one spring, said slider moving said at least one magnet and said Hall effect sensor toward each other to change an output of said Hall effect sensor to indicate a tension level in the seat restraint system when said at least one spring is deflected.

13. A tension sensing assembly as set forth in claim 12 wherein said slider includes at least one spring pocket extending therein to receive one end of said at least one spring.

14. A tension sensing assembly as set forth in claim 13 wherein said slider includes at least one aperture extending longitudinally therethrough and communicating with said at least one spring pocket, said cable extending through said at least one spring and said at least one aperture.

18. A tension sensing assembly as set forth in claim 12 wherein said at least one magnet is fixed to said slider and said Hall effect sensor is fixed to said housing.

19. A tension sensing assembly as set forth in claim 12 wherein said at least one spring is a coil spring tuned to a predetermined force.

20. A tension sensing assembly as set forth in claim 12 including a seal disposed between said anchor plate and said housing.

15. A tension sensing assembly for a seat restraint system comprising:

an anchor plate adapted to be connected to one of a buckle assembly of the seat restraint system, seat belt webbing of the seat restraint system, and vehicle structure;

a housing connected to said anchor plate;

at least one spring disposed in said housing;

at least one magnet disposed in said housing;

a Hall effect sensor disposed in said housing and cooperable with said at least one magnet;

a slider disposed in said housing;

a cable extending through said housing and cooperable with said slider to move said slider to deflect said at least one spring, said slider moving said at least one magnet relative to said Hall effect sensor to change an output of said Hall effect sensor to indicate a tension level in the seat restraint system when said at least one spring is deflected; and

wherein said anchor plate includes at least one aperture extending therethrough, said cable extending through said at least one aperture.

16. A tension sensing assembly for a seat restraint system comprising:

an anchor plate adapted to be connected to one of a buckle assembly of the seat restraint system, seat belt webbing of the seat restraint system. and vehicle structure;

a housing connected to said anchor plate;

at least one spring disposed in said housing;

at least one magnet disposed in said housing;

a Hall effect sensor disposed in said housing and cooperable with said at least one magnet;

a slider disposed in said housing;

a cable extending through said housing and cooperable with said slider to move said slider to deflect said at least one spring, said slider moving said at least one magnet relative to said Hall effect sensor to change an output of said Hall effect sensor to indicate a tension level in the seat restraint system when said at least one spring is deflected; and

wherein said slider has a protrusion extending longitudinally with an arcuate shaped longitudinal end, said cable extending around said longitudinal end.

17. A tension sensing assembly as set forth in claim 16 wherein said protrusion has at least one rib extending laterally therefrom for contacting said cable.

21. A seat restraint system for a vehicle comprising:

a seat belt buckle;

an anchor plate connected to said seat belt buckle;

a housing connected to said anchor plate;

a plurality of springs disposed in said housing;

a pair of magnets disposed in said housing and spaced longitudinally;

a Hall effect sensor disposed in said housing and spaced longitudinally between said magnets; and

a slider disposed in said housing; and

a cable extending through said housing and having ends adapted to be operatively connected to vehicle structure, said cable being cooperable with said slider to move said slider to deflect said springs, said slider moving said magnets relative to said Hall effect sensor to change an output of said Hall effect sensor to indicate a tension level in the seat restraint system when said springs are deflected.

22. A seat restraint system for a vehicle comprising:

a seat belt webbing;

an anchor plate connected to said seat belt webbing;

a housing connected to said anchor plate;

a plurality of springs disposed in said housing;

a pair of magnets disposed in said housing and spaced longitudinally;

a Hall effect sensor disposed in said housing and spaced longitudinally between said magnets; and

a slider disposed in said housing; and

a cable extending through said housing and having ends adapted to be operatively connected to vehicle structure, said cable being cooperable with said slider to move said slider to deflect said springs, said slider moving said magnets relative to said Hall effect sensor to change an output of said Hall effect sensor to indicate a tension level in the seat restraint system when said springs are deflected.

23. A seat restraint system for a vehicle comprising:

a seat belt buckle;

an anchor plate adapted to be connected to vehicle structure;

a housing connected to said anchor plate;

a plurality of springs disposed in said housing;

a pair of magnets disposed in said housing and spaced longitudinally;

a Hall effect sensor disposed in said housing and spaced longitudinally between said magnets; and

a slider disposed in said housing; and

a cable extending through said housing and having ends connected to said seat belt buckle, said cable being cooperable with said slider to move said slider to deflect said springs, said slider moving said magnets relative to said Hall effect sensor to change an output of said Hall effect sensor to indicate a tension level in the seat restraint system when said springs are deflected.