Abstract: A lifting device for transporting loads includes a vertical support structure and a horizontally extending cantilevered support arm which is attached to the support structure by a hooked portion engaging in a slot with simultaneous engagement of a bolt within an aperture. The hooked portion and slot and the bolt and aperture may each be defined, respectively, on opposite ones of the contact plate and the support structure in order that they may be engaged to removably mount the cantilevered support arm on the support structure.

Abstract: A hydraulic lifting jack including a ratchet and pawl stop mechanism which is blocked by an actuating lever pivotally mounted with a generally vertically extending rail adapted to be moved transversely to its longitudinal extension to pivot the actuating lever into and out of locking engagement with the pawl. A hydraulic device may be utilized to actuate the vertical rail.