Abstract: A building maintenance unit includes a base, a first rigid arm, a second rigid arm, a rigid support element, a plurality of drives, and a control unit. If the control unit receives a movement command to move a cradle of the building maintenance unit from a present position to a new position, the control unit is adapted to send control signals such that the cradle at least substantially maintains a constant orientation during a movement to the new position until the new position is reached. Further, a building that has a building front and a building maintenance unit is disclosed.

Abstract: A crane comprising a laterally projecting crane jib on which a hoisting device is arranged and which is connected to at least one carrier body, which, together with the crane jib, can travel along an upper guide rail and a lower guide rail by way of traveling gears, wherein in each case the upper and the lower guide rails, and correspondingly, the traveling gears, are arranged spaced vertically from one another. In order to provide a crane comprising a laterally projecting crane jib, in particular a bracket crane or a traveling crane, the manufacture, transport and installation of which are optimized, according to the invention the at least one carrier body is designed as one component and connecting surfaces are arranged on said carrier body, to which a respective traveling gear and the crane jib can be detachably fastened.

Abstract: A crane comprising a laterally projecting crane jib on which a hoisting device is arranged and which is connected to at least one carrier body, which, together with the crane jib, can travel along an upper guide rail and a lower guide rail by way of traveling gears, wherein in each case the upper and the lower guide rails, and correspondingly, the traveling gears, are arranged spaced vertically from one another. In order to provide a crane comprising a laterally projecting crane jib, in particular a bracket crane or a traveling crane, the manufacture, transport and installation of which are optimized, according to the invention the at least one carrier body is designed as one component and connecting surfaces are arranged on said carrier body, to which a respective traveling gear and the crane jib can be detachably fastened.

Abstract: The present swimming shoe is intended for use in connection with breast stroke swimming as opposed to other types of swim strokes. For this purpose the body of the present swimming shoe has a cavity for receiving a swimmer's foot and a bottom or sole as well as a shoe upper. Two thrust or propulsion flaps or flippers are hinged to the shoe body in such a manner that a pulling movement of the swimmer's legs substantially reduces the surface area of the swimming shoe, whereas a thrust or propulsion movement of the swimmer's legs increases the "thrust surface area" in an optimal manner. To this end one propulsion flap is hinged to a longitudinal edge of the sole whereas another propulsion flap is hinged to the longitudinal side of the shoe upper, preferably diagonally opposite the first flap or flipper.

Abstract: The exhaust system of the engine is provided with a reactor, for example a catalytic reactor; the air-fuel mixture normally fed to the engine is set to be on the lean range. During starting, the mixture is enriched for a predetermined time; the degree of enrichment is then decreased, in dependence on engine, or exhaust system temperature. After the engine, or the reactor has reached operating temperature, the composition of the mixture is controlled by operating parameters of the engine, or sensed exhaust gas composition.