1. Closing device for automatic door drum, of the type wherein said drum incorporates framing the mouth of access to the interior thereof, a seal which is deformable against the door, in the closed door movable by sliding between two profiles or side rails, and shiftable likewise against said board by means of a hydraulic ram or pneumatic, characterized in that in addition the said device pneumatic or hydraulic pressing the door against the seal incorporates a mechanical mechanism maintained in a stable position said door pressure against the seal associated with the drum, maintaining the seal for the same regardless of the operancia or failure of the pneumatic or hydraulic system.
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