Patent ID: 8505877

Claim:
Rescue apparatus comprising prising arms having mutually facing external and internal surfaces and including prising tips on a distal end of the arms with a serrated surface on a cylindrical body mounted in at least one pivot bearing arrangement with a drive system which is being displaced in a pincer-type movement about a pivot axis extending perpendicular to a longitudinal mid-axis of a support housing, wherein at least surface regions on at least the mutually facing internal surfaces of the prising arms have a resistance to wear that is higher than the resistance to wear of adjacent regions of the prising arms, and the surface regions comprise hard substances introduced into the base material of the prising arms, wherein the surface regions with a higher wear resistance include rib-type raised areas, wherein the raised areas are provided in the form of ribs in the surface regions extending parallel with one another in the direction of a thickness of the prising arms, said ribs project beyond or protrude from at least the internal surfaces, wherein the prising arms comprise die-forged parts made from an aluminum alloy, and wherein a peripheral layer of the ribs is made from the aluminum alloy of the prising arms and hard substances are incorporated into an aluminum alloy matrix thereof having a base of oxide, carbide or nitride, wherein the hard substances are introduced to form the peripheral layer of the prising arm by means of a laser dispersing operation.