Patent ID: 7943869

Claim:
A lightning resistive bush for protecting electronic equipments comprising a cylindrical bush body; the bush body is composed of an inner insulative layer, a center electric-magnetic absorbing metal layer and an outer insulative layer, said body being fit over a downlead of a device for protection of lighting electromagnetic pulse, each of said device and said center eclectic magnetic absorbing metal layer is connected to ground with an individually ground lead wire, the induced electric current is further discharge along the center electric magnetic absorbing metal layer to the ground so that minimizing the risks and damages led to said electronic equipments; wherein the inner insulative layer, the center electric-magnetic absorbing metal layer and the outer insulative layer is integrated, and the center electric-magnetic absorbing metal layer is provided between the inner insulative layer and the outer insulative layer; the center electric-magnetic absorbing metal layer is cylindrical with a curvature greater than a half circle circumference and two axial edges thereof form an opening; characterized in that: the outer insulative layer of the bush body is bulged inward and forming inner threads at a proximal end of the bush body; the inner insulative layer of the bush body is also bulged outward and forming outer threads at a distal end of the bush body; said inner and outer threads can be mutually screwed to each other.