Patent EP-2762265-A1 (EP)
IPC: B23K37/00
Filed: 2014-01-30
Abstract: The cabin (100) comprises a turntable (1) for carrying parts, which are to be subjected to radiation and retrieved through an opening in the cabin, a shield (3) fixedly mounted on the turntable such that the shield is rotated with the turntable around its axis of rotation when the shield is actuated; upper flaps (4) extending along an upper part of the shield over a width of the opening, and a unit for changing the upper flaps, with respect to the shield between a low position and a high position and vice versa in the direction defined by the axis of rotation of the turntable. The cabin (100) comprises a turntable (1) for carrying parts, which are to be subjected to radiation and retrieved through an opening in the cabin, a shield (3) fixedly mounted on the turntable such that the shield is rotated with the turntable around its axis of rotation when the shield is actuated; upper flaps (4) extending along an upper part of the shield over a width of the opening, and a unit for changing the upper flaps, with respect to the shield between a low position and a high position and vice versa in the direction defined by the axis of rotation of the turntable, so that each upper flaps translate from its lower position to its upper position in which a seal between the shield and the contour of an upper frame defined at the opening is ensured when the turntable is actuated from an open position to a closed position of the cabin, and each upper flaps translate from its high position to its low position for rotating the shield about the axis of rotation of the turntable when the turntable is operated from the closed position to the open position. The changing unit includes: a roller fixedly mounted on the upper frame defined in the opening; a shaft movably mounted in translation with respect to both the shield and each of the flaps, where the shaft comprises an end which can be brought into contact with the roller when moving from the open position to the closed position of the cabin so as to cause translation of the shaft relative to the shield; and a unit placed between the shaft and each of the flaps for changing the flaps relative to the shaft in a direction opposite to the direction of translation of the shaft relative to the shield, where the flaps changing unit comprises a first rack fastened on the shaft, a second rack fixed on one of the flaps, and an engaging device for connecting the two racks. The engaging device comprises a first gear mounted on one of the racks, a second gear mounted on the other rack, where the diameter of the second gear is different from the diameter of the first gear, and a shaft for connecting the two gears, so that movement of the shaft relative to the shield is multiplied in comparison to the movement of the flaps relative to the shield. The flaps changing unit further comprises a housing fixedly mounted on the shaft, and a guide pin fixedly mounted on each of the flaps, where the guide pin is mounted in sliding connection relative to the housing. One of the flaps extends along the upper portion of a first surface of the shield, and the other flap is extending along the upper part of the second surface of the shield opposite to the first surface. The cabin further comprises a unit for lower flaps (41, 42) relative to the shield between a high position and a low position and vice versa, where the unit comprises: a guide pin fixedly mounted on each of the lower flaps; a guide unit fixedly mounted on one of the lower flaps and movable in translation along a guide axis; a U-shaped connecting piece mounted on each of the lower flaps; and a rod that comprises a first end mounted on an end of the drive shaft of one of the upper flaps and another end mounted on the connecting piece. One of the lower flaps extends along the lower portion of a first surface of the shield and mounted on the guide shaft through the guide unit. The other lower flap extends along the lower part of a second surface of the shield by the connecting piece. A unit changes the two lower flaps relative to the shield between a high position and a low position, and vice versa.