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1. (WO2018106768) IMPACT SENSOR BODY HAVING FLEXURE MEMBER
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WHAT IS CLAIMED IS:

1. An impact sensor body comprising

a body of material having a striking edge with surfaces extending rearwardly from the striking edge defining upper and lower surfaces and side surfaces extending between the upper and lower surfaces, wherein a primary aperture extends through the body of material between the upper and lower surfaces, or between the side surfaces, the primary aperture being located on a centerline between the side surfaces and transverse to the striking edge, wherein a secondary aperture extends through the body of the material between the upper and lower surface, or between the side surfaces, the secondary aperture being on the centerline and spaced apart from the primary aperture to form a flexure member.

2. The impact sensor body of claim 1 wherein a surface of the flexure member forms part of an inner surface of the primary aperture.

3. The impact sensor body of claim 2 wherein the body of material is configured to create tensile stresses causing tensile strains on the surface of the flexure member that are parallel with the striking edge with impact on the striking edge.

4 The impact sensor body of claim 3 wherein each of the spaced apart surfaces are flat.

5. The impact sensor body of claim 3 wherein each of the spaced apart surfaces are curved.

6. The impact sensor body of any one of claims 1-5 wherein the body of material is configured to create compressive stresses causing compressive strains on spaced apart surfaces of an inner surface of the primary aperture that are orthogonal to the striking edge with impact on the striking edge.

7. The impact sensor body of claim 6 wherein each of the spaced apart surfaces are flat.

8. The impact sensor body of claim 6 wherein each of the spaced apart surfaces are curved.

9. The impact sensor body of any one of claims 2-8 and comprising strain sensors disposed on the inner surface of the primary aperture having tensile stresses causing tensile strains parallel with the striking edge and/or compressive stresses causing compressive strains orthogonal to the striking edge with impact on the striking edge.

10. The impact sensor body of claim 9 wherein the strain sensors comprise resistive strain gages.

11. The impact sensor body of claim 9 wherein the strain sensors comprise capacitive strain gages.

12. The impact sensor body of claim 9 and comprising a port of size opening to an inner surface of the primary aperture, the port of size for signal wires of the strain sensors.

13. The impact sensor body of any one of claims 9-12 wherein the strain sensors are electrically connected to form a Wheatstone bridge.

14. The impact sensor body of any of claims 1-13 wherein the body of material is configured such that the flexure member is orthogonal to a direction of motion to strike an object.

15. The impact sensor body of any one of claims 1-14 wherein at least one pair of the upper and lower surfaces, or the side surfaces are tapered extending rearwardly from the striking edge.

16. An impact sensor body includes a body of material having a striking edge with surfaces extending rearwardly from the striking edge defining upper and lower surfaces and side surfaces extending between the upper and lower surfaces, wherein a plurality of apertures are configured within the body of material to form a flexure member orthogonal to a direction of motion to strike an object.

17. The impact sensor body of claim 16 wherein at least one of the apertures of the plurality of apertures extends between the upper and lower surfaces.

18. The impact sensor body of claim 16 wherein at least one of the apertures of the plurality of apertures extends between the side surfaces.

19. The impact sensor body of any one of claims 16-18 wherein one of the pair of upper and lower surfaces, or the side surfaces are tapered.