Controlled-friction sliding device, such as a damper, which...

F - Mech Eng,Light,Heat,Weapons – 16 – F

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F16F 7/08 (2006.01)

Patent

CA 2757307

The invention relates to a controlled-friction device including first and second elements (1, 2) mounted such that they can move in relation to one another along a sliding axis. The invention is characterised in that the device includes first and second friction members (5, 5) disposed symmetrically between the aforementioned two elements in order selectively to rub against the second element, each of said friction members being returned to a wedging position by a press member (6). The first friction member is disposed such that, in a first direction of relative movement of the two elements along the movement axis, it prevents the relative movement of the two elements and, in a second direction, it exerts a resistive frictional force on the two elements, said force being dependent on a stress applied on the first wedge member by the press member. The second friction member is disposed such that, in the second direction, it prevents the relative movement of the two elements and, in the first direction, it exerts a resistive frictional force on the two elements, said force being dependent on a stress applied on the second wedge member by the press member. The device also includes neutralising means (10, 13, 14) for neutralising the friction member that can block the relative movement of the elements in one direction of the other, while allowing the other friction member to exert the resistive frictional force.

L' invention est relative à un dispositif à friction contrôlée comportant un premier et un deuxième élément (1, 2) montés mobiles l'un part rapport à l'autre selon une direction de glissement, caractérisé en ce que le dispositif de l'invention comporte des premier et deuxième organes frotteurs (5, 5) disposés de façon symétrique entre les deux éléments pour frotter sélectivement sur le deuxième élément, les organes frotteurs étant rappelés chacun vers une position de coincement par un organe presseur (6), le premier organe frotteur étant disposé pour, dans un premier sens de déplacement relatif des deux éléments le long de la direction de déplacement, tendre à empêcher le déplacement relatif des deux éléments, et dans un deuxième sens, exercer sur les deux éléments un effort de friction résistant dépendant d'une contrainte installée sur le premier organe de coin par l'organe presseur; tandis que le deuxième organe frotteur est disposé pour dans le deuxième sens, tendre à empêcher le déplacement relatif des deux éléments, et dans le premier sens, exercer sur les deux éléments un effort de friction résistant dépendant d'une contrainte installée sur le deuxième organe de coin par l'organe presseur; le dispositif comprenant en outre des moyens de neutralisation (10, 13, 14) pour neutraliser celui des organes frotteurs susceptible de bloquer le déplacement relatif des éléments dans un sens ou dans l'autre, en laissant l'autre organe frotteur exercer l'effort de friction résistant.

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