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Poleas fijas, provistas de un dispositivo que permite retener simultáneamente la cuerda o elemento flexible de enlace cualquiera sobre la garganta de la polea y la polea en sí sobre su eje, imposibilitando así el descenso o caída libre de la carga, de forma que en toda variante del dispositivo que constituye el presente modelo de utilidad es esencial la combinación de una palanca con una leva excéntrica y un trinquete, actuando unidos o separados.