PCT No. PCT/SE81/00210 Sec. 371 Date Feb. 25, 1982 Sec. 102(e) Date Feb. 25, 1982 PCT Filed Jul. 8, 1981 PCT Pub. No. WO82/00284 PCT Pub. Date Feb. 4, 1982.Device in a container for bulk material including a main part with mainly vertical walls and a converging feed-out part. In the feed-out part (3) an upwards vault mantle (7) is placed, and the mantle having a large number of openings (9) distributed over its surface, the openings permitting bulk material to pass through. The vault mantle is arranged in such a way that it can carry out oscillating movements in the container, whereby tendencies of bridge building in the container may be avoided and at the same time it is secured that the bulk material will reach the feed-out opening (4) adjacent to the feed-out zone in loose form. The vault mantle may have different configurations, e.g. the form of a lying cylinder, half-cylinder, an upwards vault dome or the form of an upwards pointing cone. The vault bottom and specially when it has the form of a cone may also be provided with projecting parts, e.g. in form of a separate rotatable tube with feed-in openings for bulk material. The oscillating movements can consist of rotative movements around an axis or of axial movements or of combinations of both forms of movement.
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