Patent ID: 7488912

Claim:
A sensing mechanism disposed in a receptacle housing for sensing whether the receptacle housing is covered by a lid body or not, the receptacle housing being connected to a circuit board having a sensing switch, the sensing mechanism being characterized in that: the receptacle housing comprises an opening disposed at one side thereof, corresponding in position to the sensing switch, the opening comprising a top portion and a bottom portion, the top portion being connected with the top of the receptacle housing, the bottom portion being connected with the bottom of the receptacle housing, the top portion having a stopping end portion and an inner diameter larger than that of the bottom portion; an action member is disposed in the opening and has a length longer than a depth of the opening and an outer diameter matching an inner diameter of the bottom portion of the opening, the action member having a stopping flange abutting against the stopping end portion; and an elastic member is disposed between the stopping flange of the action member and the top of the bottom portion of the opening so as to make the top of the action member protrude to a region outside of the top of the receptacle housing, wherein when the lid body covers the receptacle housing, the action member is pressed by the lid body so as to move downward, thereby starting the sensing switch.