It's a security latch. Used to keep the door from opening if installed correctly. The curved bit slides down and locks when flush with the door usually in conjunction with a door chain. Not terribly good which is why they fell out of favour. More of a 60-70s era thing. I haven't seen one in a long time.
It's a security latch. Used to keep the door from opening if installed correctly. The curved bit slides down and locks when flush with the door usually in conjunction with a door chain. Not terribly good which is why they fell out of favour. More of a 60-70s era thing. I haven't seen one in a long time.