Hood-lifting actuator with disarmable return braking...

F - Mech Eng,Light,Heat,Weapons – 15 – B

Patent

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Details

F15B 15/19 (2006.01) F15B 15/26 (2006.01) B60R 21/34 (2006.01)

Patent

CA 2717346

The invention relates to an activated-stroke actuator comprising a body (12) that houses a mobile assembly consisting of a piston (13), a rod (16) that penetrates the end of the body (12) and a sliding element (17) that moves inside body (12). The actuator further comprises a means for propelling the piston (13) in response to an activation command, and a return braking arrangement. The return braking arrangement consists of at least one bearing ball (18) fitted into an annular cavity (19) defined by the inner surface of the body (12) and by the sliding element (17), a return spring (22) connecting the sliding element (17) to the piston (13) and a connecting element (23) connecting the bearing ball (18) to the piston (13). The bearing ball (18) is positioned by the connecting element (23) in a first segment (20) in the annular cavity (19) when the return spring (22) is extended, and in a second segment (21), of decreasing radial height, when the return spring (22) is compressed. Thus, the braking arrangement is disarmed when the force applied to the piston (13) returns to a value that is lower than a threshold value.

Le vérin à course déclenchée comporte un corps (12) abritant un ensemble mobile constitué d'un piston (13), d'une tige (16) faisant saillie à une extrémité du corps (12) et d'un élément coulissant (17) mobile dans le corps (12). Le vérin comporte, en outre, des moyens pour propulser le piston (13) en réponse à une commande de déclenchement, et un agencement de freinage en retour. L'agencement de freinage en retour est constitué d'au moins une bille (18) logée dans une cavité annulaire (19) délimitée par la surface interne du corps (12) et par l'élément coulissant (17), d'un ressort de rappel (22) reliant l'élément coulissant (17) au piston (13) et d'un élément de liaison (23) reliant la bille (18) au piston (13). La bille (18) est positionnée par l'élément de liaison (23) dans un premier tronçon (20) de la cavité annulaire (19) lorsque le ressort de rappel (22) est détendu, et dans un second tronçon (21), de hauteur radiale décroissante, lorsque le ressort de rappel (22) est comprimé. Ainsi, l'agencement de freinage est désamorcé lorsque l'effort appliqué sur le piston (13) redevient inférieur à une valeur seuil.

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