Disclosed is a radiation protection screen for protecting an operator from ionizing radiation, which screen includes a front partition structure that is made of one or more radiation protection materials and a side partition structure that is made of one or more radiation protection materials, the partitions being joined together at a vertical or substantially vertical corner border, and which screen includes feet that are equipped with wheels that rest on the ground. Furthermore, according to the invention, this screen is arranged such that the front partition structure includes a lower portion and an upper portion that may be moved with respect to each other, the upper portion of the front partition structure being mounted so as to be able to pivot in the region of the corner border, about a vertical or substantially vertical pivoting axis.

A hopper door opening and closing apparatus operates a door on a hopper discharge opening. A pair of motorized linear actuators, each having an extendable rod, are mounted to support rails on opposite sides of the door. A bracket connects the rods to the door. A controller selectively activates the linear actuators to extend the rods and thereby move the door to an open position that permits material to flow through the lower opening and selectively activates the linear actuators to retract rods and thereby move the door to a closed position covering the lower opening.

A hopper door opening and closing apparatus operates a door on a hopper discharge opening. A pair of motorized linear actuators, each having an extendable rod, are mounted to support rails on opposite sides of the door. A bracket connects the rods to the door. A controller selectively activates the linear actuators to extend the rods and thereby move the door to an open position that permits material to flow through the lower opening and selectively activates the linear actuators to retract rods and thereby move the door to a closed position covering the lower opening.

A hopper door opening and closing apparatus operates a door on a hopper discharge opening. A pair of motorized linear actuators, each having an extendable rod, are mounted to support rails on opposite sides of the door. A bracket connects the rods to the door. A controller selectively activates the linear actuators to extend the rods and thereby move the door to an open position that permits material to flow through the lower opening and selectively activates the linear actuators to retract rods and thereby move the door to a closed position covering the lower opening.

A hopper door opening and closing apparatus operates a door on a hopper discharge opening. A pair of motorized linear actuators, each having an extendable rod, are mounted to support rails on opposite sides of the door. A bracket connects the rods to the door. A controller selectively activates the linear actuators to extend the rods and thereby move the door to an open position that permits material to flow through the lower opening and selectively activates the linear actuators to retract rods and thereby move the door to a closed position covering the lower opening.

The device comprises a main body, fixing means affording the fixing of the leaf to the body, drive means able to drive a body under the effect of motor means, locking means able to move between an active locking position in which they lock the drive means with respect to the body, in the closed position of the leaf, and an inactive unlocking position in which they allow a displacement of the drive means with respect to this body, and partial opening means able to allow a small movement of the fixing means with respect to the drive means, in the displacement direction, from the closed position of the leaf. The device further comprises means for inhibiting the partial opening means, able to immobilize the fixing means with respect to the drive means, at least in translation in said displacement direction, when the locking means are in their inactive position.

A motor drive device for moving a vehicle sliding door is provided. The device includes an electric motor, a force transmission mechanism operationally connectable to the vehicle sliding door and the electric motor to transmit a drive force provided by the motor to the sliding door, sensors at least for determining an instantaneous position of the vehicle sliding door, an electronic control unit for activating at least the motor, and a shift clutch coupled to the force transmission mechanism and couplable to the motor for load-independent coupling of the motor to the force transmission mechanism. The control unit, in the event of application of a sufficient force to the sliding door during a power-driven movement, either elevates a speed of the vehicle sliding door by elevating the transmitted drive force or decouples the force transmission mechanism and the motor with the shift clutch.

A motor drive device for moving a vehicle sliding door is provided. The device includes an electric motor, a force transmission mechanism operationally connectable to the vehicle sliding door and the electric motor to transmit a drive force provided by the motor to the sliding door, sensors at least for determining an instantaneous position of the vehicle sliding door, an electronic control unit for activating at least the motor, and a shift clutch coupled to the force transmission mechanism and couplable to the motor for load-independent coupling of the motor to the force transmission mechanism. The control unit, in the event of application of a sufficient force to the sliding door during a power-driven movement, either elevates a speed of the vehicle sliding door by elevating the transmitted drive force or decouples the force transmission mechanism and the motor with the shift clutch.

A cross-sectional shape of an open-side cable 22a is formed into a round shape, and a cross-sectional shape of respective connecting units 52 between a pulley groove 50 of a pulley 46 and flange portions 51 is formed into a circular arc shape. Thus, it is possible to surely suppress damage of the open-side cable 22a caused by being strongly pressed to a corner as a conventional manner. Therefore, it is possible to improve durability of the open-side cable 22a, whereby it is possible to extend a maintenance cycle of a driving unit and obtain high reliability thereof.

A method for opening and closing a door of a vehicle may include receiving a signal indicative of either opening or closing the vehicle door, determining whether the opening or closing will be performed by an operator or via a powered actuator based on the signal, and generating, if the opening or closing will be performed by the powered actuator, a first control signal indicative of a first position to which the door is to be moved. The method may further include controlling the powered actuator to cause the door to move from an original position to the first position.