Emergency brake device for occurrence of acceleration of elevator door

An emergency brake device fixedly mounted on both ends of an elevator door and elevating along a guide rail, the emergency brake device comprising:

• a fixing bracket (110) coupled to and installed in the elevator door;
• an acceleration prevention device (100) installed inside a front side of the fixing bracket (110) and configured to generate a braking force when a door lowering speed of the elevator door increases to a specified speed or more;
• a braking blade movable tool (150) configured to receive the braking force of the acceleration prevention device (100) to bring a braking blade (151) into contact with the guide rail (300) so as to stop the lowering of the elevator door;
• and
• a braking force transmission tool configured to transmit the braking force between the acceleration prevention device (100) and the braking blade movable tool (150),
• wherein the acceleration prevention device (100) includes:
• a rotating body (20) which has a shape of a disc and in which an accommodation groove recessed toward an inside of the disc is formed in an outer circumferential surface of the disc and a center shaft (21) is installed at a center of the disc;
• an outer body (40) which is installed in a fixed state to surround an outer circumferential surface of the rotating body (20) and in which an empty space accommodating the rotating body (20) in a rotatable state is formed and a stop groove (41) recessed toward an outside is formed in an inner circumferential surface forming the empty space;
• and
• a moving body (30) accommodated inside the accommodation groove to move in a lengthwise direction of the accommodation groove.