Clutch for preventing backdrive

A clutch for preventing backdrive, the clutch comprising:

• a housing;
• a cover portion located at one end portion of the housing;
• an external shaft, a first end portion of which is located in the housing, and a second end portion of which externally passes through the housing;
• a plurality of lockers located inside the housing and surrounding the first end portion of the external shaft;
• an input shaft, a first end portion of which is inserted into openings of the plurality of lockers and a second end portion of which externally pass through the cover portion;
• and
• a brake unit configured to be selectively engaged to the lockers to restrict rotations of the lockers,
• wherein the external shaft is restricted by the lockers so that the external shaft and the lockers are rotated in a rotation direction of the input shaft, and movements of the lockers are restricted by the brake unit when the external shaft is rotated,
• wherein neighboring lockers among the plurality of lockers are configured to be fastened with each other when the input shaft is rotated,
• wherein each of the lockers further includes a pressing protrusion which is located at an end portion adjacent to an internal circumferential surface of the housing, and
• wherein each of the lockers further includes an insertion groove which is located to correspond to the pressing protrusion.