Patent EA-004197-B1 (EA)
Title: Tensile testing sensor for measuring mechanical jamming deformations on first installation and automatic calibrating based on said jamming
Inventor: MAUBAN PHILLIPPE
IPC: G01L1/04
Filed: 1999-02-16
Abstract: 1. A tensile testing sensor mountable on a mechanical member in which forces to be measured develop, comprising a bendable flat metal blade provided with measuring gauges implemented and positioned on the blade and equipped with mechanically locking flange placed during calibration between the bearing parts of the sensor blade. 2. A tensile testing sensor according to claim 1, wherein the locking flange emits an electrical value signal in relation with characteristics of installation of the flange. 3. A tensile testing sensor according to claim 1, 2 wherein the flange is mounted between the bearing parts of the sensor blade. 4. A tensile testing sensor according to any of claims 1-3, wherein the flange is subject to a rupture after the sensor is mounted on the member and wherein there is a relationship between the value of the pre-constrained force to which the blade is submitted and the value of the electrical signal delivered by the sensor before the rupture of the flange. 5. A tensile testing sensor according to claim 1, wherein the flange is a rigid element, which is cuttable when the tensile testing sensor is coupled to the mechanical member. 6. A tensile testing sensor according to claim 1, wherein the mechanical locking flange is on the shape of a rigid hood and the bearing parts of the sensor blade are fastenable jointly to the hood during the setting. 7. A tensile testing sensor according to claim 7 wherein the hood comprises means to allow the bearing parts in the shape of abutments to slide in the hood on a longitudinal axis in the direction of the blade and means are provided to fasten the bearing parts to constrain the movement of these pieces relatively to the hood. 8. A tensile testing sensor according to claim 1, wherein the bearing parts are abutments and the blade is elastically in isostatic support at its ends, on the abutments, maintained in flexion by buckling. 9. A tensile testing sensor according to claim 8 wherein the blade was subjected to a permanent deformation destined to give it an initial curvature. 10. A tensile testing sensor according to any of claims 7, 8, 9, wherein the abutments are released to assure the freedom of operation once the sensor is mounted on the mechanical member. 11. A tensile testing sensor according to claim 10 wherein the hood comprises at least two parallel flanks with inclined faces inside the hood which give support corresponding to each abutment, and the interior faces of the flanks have longitudinal grooves to allow movement of the abutments on a longitudinal axis. 12. A tensile testing sensor according any of claims 7-11, wherein the abutments are interconnected due to a device forming a spring antagonistic to the blade. 13. A tensile testing sensor according to claim 12 wherein the spring is made from a flat member to which one has added elasticity using notches. 14. A tensile testing sensor according to claim 1 wherein said flat blade is generally rectangular and has a central portion and two ends and wherein the width of the central portion is less than the width of the two ends. 15. A tensile testing sensor according to claim 14, wherein the abutments are interconnected due to a device forming a spring antagonistic to the blade. 16. A tensile testing sensor according to claim 14 wherein the flat blade is I-shaped. 17. A tensile testing sensor comprising a flat blade being in the buckling state, two end supports of the elastic blade and means for measuring of deformation of the part to be controlled, elastic blade being joined integrally with said supports, interconnected by means of elastic element, balancing the elastic blade. 18. A tensile testing sensor according to claim 17 wherein said flat blade is generally rectangular and has a central portion and two ends and wherein the width of the central portion is less than the width of the two ends. 19. A tensile testing sensor according to claim 18 wherein the flat blade is I-shaped.