Abstract: The present invention relates to a lifting jack support system for supporting an object to be lifted by a lifting jack with a movable top side, the lifting jack support system comprising: a base unit, mounted on the top side of the lifting jack, having a support arm extending away with a front end, with one or several positioning plates fastened on the top side of the base unit, a gap lying within or between the positioning plates; and a top unit, having a link arm, which is hingedly connected to the front end of the support arm, and one or several positioning elements, the top unit either resting on the base unit, with the positioning elements fitting into the gap, or being folded away therefrom, such that starting positions at two different heights for lifting the object are provided.

Abstract: The present invention relates to a lifting jack with safety and release system for lifting an object, comprising: a main body; a driving system; a support system, hingedly mounted on the main body and undergoing a raising and a lowering movement, as driven and released by the driving system; a safety system, further comprising a ratchet, mounted on the main body, a pawl, which during the raising movement engages with the ratchet for blocking any unintended lowering of the support system, and a lever with a rear end and with a front end below the pawl, for disengaging the pawl from the ratchet by lowering its rear end; and a release system, further comprising a catch, hingedly mounted on the main body, having a nose for engaging with the rear end of the lever, and a spring, pulling the catch towards the rear end of the lever; wherein, for lowering the support system, the rear end of the lever is pressed down manually and then held by the nose of the catch, such that the pawl stays disengaged from the ratchet a