Automatic locking device and window

An automatic locking device configured to lock a locking point, comprising:

• a locking base;
• a locking tongue slidably mounted on the locking base in an elastically resettable manner, the locking tongue provided with an inclined guiding surface and an engaging surface away from the guiding surface, the locking point pushing against the guiding surface to enable the locking tongue to slide relative to the locking base while moving along a locking path, and the locking tongue being elastically reset when the locking point crosses the guiding surface and locking the locking point through the engaging surface;
• and
• a force assisting lever rotatably mounted to the locking tongue, the force assisting lever being provided with a first force assisting surface and a second force assisting surface, wherein the first force assisting surface is located outside and below of the guiding surface to abut against the locking point in a locking process of a downward movement of locking point, when the locking point pushes against the first force assisting surface to enable the force assisting lever to rotate, the second force assisting surface abuts against a fulcrum fixed on the locking base and enable the locking tongue to slide downward until the locking point is in contact with the guiding surface, when the locking point crosses the guiding surface and the locking tongue is elastically reset, the second force assisting surface abuts against again the fulcrum and enable the force assisting lever to rotate reversely and reset;
• wherein the locking base is also provided with a blocking wall aligned with the engaging surface of the locking tongue, and the locking point is driven to move up along the engaging surface of the locking tongue and is locked by the blocking wall after the locking point is disengaged from the engaging surface;
• wherein the automatic locking device further comprises an unlocking lever rotatably mounted on the locking tongue in an elastically resettable manner, the unlocking lever comprises a first acting surface and a second acting surface, the first acting surface abuts with the locking point when the locking point pushes against the guiding surface to be locked between the engaging surface and the unlocking lever, so that the unlocking lever is pushed by the locking point to rotate to avoid the locking tongue, the second acting surface is located below the locking point when the unlocking lever rotates reversely and resets after the locking point is driven to move up and disengaged from the engaging surface, in a process that the locking point is driven to move down, the second acting surface abuts with the locking point, so as to enable the unlocking lever to drive the locking tongue to slide down until the locking point is disengaged from a blocking of the blocking wall.