ANTIBODY DEVICE FOR AVOIDING THE MULTIPLE SHOCK OF A MOBILE MASS AFTER A FIRST SHOCK AGAINST ANOTHER ELEMENT

摘要

P Anti-rebound device to prevent multiple shocks of a moving mass after a first impact against another element. / P P Magnetic means are associated with the element in order to exert on the mass a force of sufficient attraction to prevent a possible rebound. These means include, for example, electromagnets 5 and circuits 6 for connecting them to a current source 7 via a switch. They can also be combined with permanent magnets 4. The direction of the electric current is then chosen so that the electro-magnetic forces developed add to the attraction forces of the permanent magnets or to cancel them, which allows a clearance of mass. / P P Application to seismic prospecting using percussion sources. / P