FORCE MEASURING DEVICE

• US 20080078254A1
• Filed: 09/20/2007
• Published: 04/03/2008
• Est. Priority Date: 04/05/2005
• Status: Active Grant

• Current Assignee: Bag Bizerba Automotive GmbH (Bizerba SE & Co. KG)
• Original Assignee: Bag Bizerba Automotive GmbH (Bizerba SE & Co. KG)
• Inventors: Sautter, Sven, Hampe, Andreas
• Granted Patent: US 7,444,881 B2
• Time in Patent Office: Days
• US Class Current: 73/862.69
• CPC Class Codes: G01G 19/4142 for controlling activation of safety devices, e.g. airbag systems electrical circuits for triggering safety arrangements in case of vehicle accidents B60R21/015
• CPC Class Codes: G01L 1/122 by using permanent magnets

Abstract

The invention relates to a load gauge comprising a generator-sensor assembly. Said assembly comprises a generator unit that generates a magnetic field and a sensor unit that is sensitive to magnetic fields, said generator unit and sensor unit being displaceable by a force in relation to one another. According to the invention, the generator unit comprises at least one permanent magnet and a second permanent magnet, each with a geometric cross-section that remains essentially constant in a longitudinal direction. The first permanent magnet and the second permanent magnet are situated at an angle to one another.

Claims

1. A force measuring device, comprising a transducer-sensor assembly with a transducer device that generates a magnetic field and a sensor device that is sensitive to magnetic fields, wherein the transducer device and the sensor device are movable relative to one another by force acting on the force measuring device, characterised in that the transducer device comprising at least a first permanent magnet and a second permanent magnet, which each have a substantially constant geometric cross-section in a longitudinal direction the first permanent magnet and the second permanent magnet being arranged at an angle to one another.

2. The force measuring device according to claim 1, wherein the first permanent magnet and the second permanent magnet Ware dipole magnets.

3. The force measuring device according to claim 1, of wherein the first permanent magnet includes a north magnetic pole and a south magnetic pole, and the north magnetic pole and south magnetic pole follow one another in the longitudinal direction of the first permanent magneto.

4. The force measuring device according to claim 1, wherein the second permanent magnet includes a north magnetic pole and a south magnetic pole, and the north magnetic pole and south magnetic pole follow one another in the longitudinal direction of the second permanent magnets.

5. The force measuring device according to claim 1, wherein the first permanent magnet and the second permanent magnet are configured substantially identically.

6. The force measuring device according to claim 1, wherein characterised in that the first permanent magnet is formed between a first boundary plane and a parallel second boundary plane.

7. The force measuring device according to claim 1, wherein the second permanent magnet is formed between a first boundary plane and a parallel second boundary plane.

8. The force measuring device according to claim 7, wherein the first boundary plane of the first permanent magnet and the first boundary plane of the second permanent magnet lie at an acute angle to one another.

9. The force measuring device according to claim 1, wherein the first permanent magnet is cuboidal.

10. The force measuring device according to claim 1, wherein the second permanent magnet is cuboidal.

11. The force measuring device according to claim 1, wherein the first permanent magnet is a cylindrical bar magnet.

12. The force measuring device according to claim 1, wherein the second permanent magnet is a cylindrical bar magnet.

13. The force measuring device according to claim 1, wherein the longitudinal directions of the first permanent magnet and of the second permanent magnet lie at an acute angle to one another.

14. The force measuring device according to claim 13, wherein the acute angle lies between 5°

and 45°

.

15. The force measuring device claim 1, wherein a respective pole of the first permanent magnet and of the second permanent magnet are directed towards the sensor devices.

16. The force measuring device according to claim 15, wherein a north magnetic pole of one permanent magnet and a south magnetic pole of the other permanent magnet are directed towards the sensor device.

17. The force measuring device claim 1, wherein the first permanent magnet is arranged in a first receiver of the transducer device and the second permanent magnet is arranged in a second receiver of the transducer device.

18. The force measuring device according to claim 17, wherein the first receiver Land the second receiver are arranged at an angle to one another.

19. The force measuring device according to claim 1, wherein a wedge element is seated between the first permanent magnet Land the second permanent magnet.

20. The force measuring device according to claim 1, wherein the longitudinal direction of the first permanent magnet Land the longitudinal direction of the second permanent magnet intersect in a region in front of the transducer device, in which the sensor device is arranged.

21. The force measuring device according to claim 1, wherein the sensor devices comprises at least one Hall effect sensor.

22. The force measuring device according to claim 1, wherein an elastic force transducer his provided, to which the transducer device or the sensor device is coupled.

23. The force measuring device according to claim 22, wherein the force transducer his configured as a hollow bar, which has a first weakening zone and a spaced second weakening zone.

24-25. -25. (canceled)