Patent ID: 6418872
Filing Date: 2002-07-16
Classification: B63B,B65H

Abstract:
A device for providing yo-yo seismic shooting, the device comprising a cable for connecting a surface vessel advancing at substantially constant speed and a sea bed sled, the cable being wound on a winch mounted on the deck of the vessel, a block-and-tackle unit including a frame being located on the deck between the winch and the sled, wherein the block-and-tackle unit is fixed to the frame for letting out and taking in the length of cable necessary to enable the sled to be moved in jumps, the block-and-tackle unit being constituted by two sets of sheaves over which the cable passes, a first set of sheaves being fixed on the block-and-tackle unit while the second set of sheaves is capable of being moved away from or towards the first set of sheaves by an actuator fixed to the frame, wherein the device is operable for letting out and taking in a length of the cable repetitively so as to move a payload in jumps for yo-yo seismic shooting.