Abstract: A method and a basin serve the purpose of sedimenting sludge in waste water, which in a flow is supplied to the basin via an inlet and in clarified condition is removed via an outlet placed opposite to the inlet. In the inlet there has been built in resistances of flow which create a heavy turbulence in the water flowing and transform a substantial part of the energy of flow from the water into energy in the whirls which create the turbulence. Thereby there are created flow conditions which increase the creation of sludge flocs and the succeeding sedimentation of these.

Abstract: Apparatus for restraining movement of a parked vehicle away from a loading dock comprises an upwardly extending block which is movable from a lower position to an upper position which captures a portion of the parked vehicle to restrain movement of the parked vehicle away from the loading dock. This apparatus provides a safety lock system to ensure that during loading and unloading of a parked vehicle the vehicle cannot accidentally pull away from the loading dock which would result in injury to the forklift truck operator. A linkage mechanism is provided which provides for the raising and lowering of the block. A drive mechanism raises and lowers the linkage in determining the lower an upper positions of the block. The linkage comprises two spaced-apart linked arms which may be in the form of a parallelogram linkage arrangement.