Improvements introduced in the manufacture of automatic door closing hinges for doors (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in the manufacture of automatic closing hinges for doors in which both upper and lower sleeves of the hinged members, where they cooperate in abutting contact, are shaped according to a helical curve so that the door rises when it is opened and low when closed; characterized by the fact that the pivot of the hinge is in the form of a tube attached to the lower organ of engozne. (Machine-translation by Google Translate, not legally binding)