Abstract: Actuator mechanism for a two-bucket grab device and having two grab arms arranged to move as pincers with respect to one another, has two hydraulic pivot motors with journals of the respective pivot shafts projecting from the motor housing and supporting the grab arms. Each of the pivot motors has a cylindrical tubular piece provided with an internal thread designed to engage an external thread on the respective pivot shaft. The tubular piece is a ring piston axially-displaceably, but non-rotatably held in a cylinder space formed in one of the respective bucket housings. Pitch of the threads is sufficiently large for the ring piston to transmit required torque to the respective pivot shaft by axial displacement of the ring piston. The displacement path of the ring piston between two annular cylinder chambers corresponding to high and low pressure chambers which can be loaded with hydraulic oil, corresponds to the desired pivot angle of the two arms of the grab bucket.

Abstract: A container is disclosed which makes the coupling a coupling device of lifting gear, such as a crane, with the container without requiring additional alignment operations as performed by special instrumentalities or by manual labor. The coupling device includes a first coupling member which consists of a bushing having an upper flange-like border, which is arranged centrally on the top side of the container. This bushing serves simultaneously as a guide member for a second coupling member which is in the form of a pull bar. The second coupling member, as well, is provided with an upper flange-like border. When handling the container one may use the coupling device with at least two hooks, which are fitted, respectively, under the flange-like borders of the coupling members in a circumferential distribution.