Abstract: The present invention provides a device for latching and unlatching a removable cover referred to as a “removable element” on a box referred to as a “fixed element”, the device comprising a latch provided on one of the elements and slidable between a latched position in which one end of the latch is in contact with the other element and unlatched position in which said end is not in contact with the other element, said latch having a gripping surface enabling it to be caused to slide. According to the invention, it has means for locking the latch in the unlatched position, at least until the cover is moved.