Auto locking, manual unlocking door stay

A door stay device for automatically locking a door in an open position comprising:

• a first component adapted to be attached to a stationary support, said first component including a plate having a curved cam edge with a radius substantially matched to a swinging movement of the door between closed and open positions, said plate having a first slot open at said curved cam edge at a location corresponding to the open position of the door;
• a second component adapted to be secured at a lower or upper edge of the door, said second component comprising an elongated channel in which a lock bar is spring-biased for sliding linear movement into said first slot when said lock bar is aligned with said first slot and the door is in the open position, and wherein said lock bar is provided with a handle permitting a user to manually withdraw said lock bar from said first slot in order to enable movement of the door from the open to the closed position.

A door panel and door stay assembly comprising:

• a door panel attached to a stationary support for swinging movement between closed and open positions;
• a first door stay component attached to the stationary support, said first door stay component including a cam plate having a curved cam edge with a radius substantially matched to the swinging movement of the door panel between the closed and open positions, said cam plate having a first slot open at said curved cam edge at a location corresponding to the open position of the door panel;
• a second door stay component secured at a lower or upper edge of the door panel, said second door stay component supporting a lock bar arranged to move automatically and linearly into said slot when said lock bar is aligned with said first slot and said door panel is in said open position.