FR OUR SERVICES EYE-T: MANAGE YOUR CYBER RISKS OUR REFERENCES CONTACT US home > detail > detail Deformation of a referee's chair causes bodily injury INVESTIGATION Investigations - A tennis umpire's chair becomes deformed and causes an accident. Our laboratory is called upon to identify the cause. The context A tennis umpire's chair deforms under the weight of the umpire, who falls to the ground and injures himself. The INQUEST laboratory is called upon to identify the cause of the deformation (design, assembly or use). For this purpose, the laboratory has a new chair for carrying out a simulation, made available by the manufacturer at the request of his insurer. INQUEST's expertise First, the laboratory studies the design and the assembly method. A potential point of weakness is then identified, but it remains to calculate the efforts to check whether the product is well sized or not. Le laboratoire simule les diverses positions de l’assemblage en libérant virtuellement le degré de liberté nécessaire à sa déformation. Les trajectoires de certains points spécifiques sont tracées et les efforts appliqués au dispositif de verrouillage du degré de liberté peuvent alors être calculés par un tableur pour toutes les positions et masses d’un individu situé en divers points de la chaise. Il est ainsi identifié le point particulier de la chaise où ces efforts sont maximaux et la masse de l’individu (en régime dynamique, c’est-à-dire en mouvement) critique au-delà de laquelle la rupture est inévitable. La masse calculée correspondant à des individus de corpulence usuelle, il n’y a aucune marge de sécurité. Le produit est donc dangereux. Real stress and fatigue tests are then carried out with a pneumatic cylinder which applies the calculated force to the calculated point and which confirms the failure mode and the value of the necessary force. It is then attested to a conceptual weakness on the part supposed to restrict the degree of freedom. Return our references 20.08.2020 Childcare: Analysis in our laboratories before product recall INVESTIGATION Investigation / Laboratories - INQUEST conducts technical investigations on childcare equipment in its internal analysis and testing laboratory in order to support the decision-making of a manufacturer following complaints about the safety of one of its products . Click here to contact us OUR SERVICES aeronautics cybersécurité risques financiers investigations RÉFÉRENCES Un accident corporel grave avec un escalier escamotable d’accès aux combles Un déchiqueteur de documents provoque une brûlure corporelle La déformation d’une chaise d’arbitre cause un accident corporel Reconstitution d’un bris sur une optique de télécinéma 16mm UN INCIDENT CYBER ? CLIQUEZ ICI Policy for managing your data. Legal Notice. Sitemap. 2021 © Stelliant