Abstract: An actuator for exciting at least one component of a motor vehicle with vibrations. The actuator includes: a housing which is configured to be directly or indirectly connected to the component, an electrical coil which is connected to the housing and is configured to generate an electromagnetic field when an electric current flows through the coil, and a magnet which is entirely or partially arranged in the housing and the magnet is arranged so as to be movable to a limited extent relative to the housing. The housing has, all around, at least one electrically conductive ring which surrounds the magnet in respect of its undeflected state.

Abstract: An actuator for exciting a component of a motor vehicle with vibrations. The actuator has a housing, an electrical coil and a magnet that is movable to a limited extent in the housing.

Abstract: A multipartite rock bolt includes a plurality of individual discrete elems which are connected to each other at their respective end portions to constitute the rock bolt which is anchored, especially cemented, in a hole of the rock to be consolidated by the rock bolt. The end portions of the elements have complementary recesses therein at which the respective assembled elements overlap each other and the connecting arrangement for connecting the respective end portions includes a projection, particularly a pin which extends transversely of the elongation of the element into the recess and is received in a complementary aperture, particularly a hole, provided at the recess of the other element. The recess is partially bounded by a detaining surface extending substantially longitudinally of the element, and the detaining surface may be inclined relative to the elongation of the element.