The hinge for doors (10), covers, etc..., comprises two releasable axes (5, 7). In order to prevent an inadvertent disengagement, a safety device (19-26) prevents the unintentional detachment or separation of the cover or of the door (10) during at least part of the rotary motion for the opening by means of a cam (24) which is engaged by a curved guide (19-23, 25). When the door (10) or the cover is closed, the guide and the cam are at least partially disengaged.
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