Patent ID: 8028521
Filing Date: 2011-10-04
Classification: A63G,F15B

Abstract:
1. A hydraulic catapult drive for accelerating an object comprising a driving element acting upon an object for acceleration and being movable along a motion track, the driving element being movable via a flexible drive and a hydraulic cylinder driving the latter in the direction of acceleration or in the resetting direction, wherein at least one pressure chamber of the hydraulic cylinder can be connected via a control system to a hydraulic medium source or a hydraulic medium sink (T), and wherein the flexible drive has two movable sets of pulleys wrapped in portions by at least one pull means, wherein, depending on the control of the hydraulic cylinder a pulling force can be transmitted to the driving element via one of the sets of pulleys and the pull means for accelerating, and via the other of the sets of pulleys and the pull means for resetting, wherein the hydraulic cylinder is a) an equal area cylinder or b) has two piston rods of different diameter, with respective ones of the sets of pulleys being disposed on corresponding ones of the piston rods.