US Patent 9560778 Cover operation mechanism

A cover operation mechanism includes a case, a cover rotatably coupled to the case, a positioning portion located on the case, and a driver engaged with the positioning portion. The case includes a receiving portion. The cover covers the receiving portion and includes a shaft slidable and mounted in the slot. The driver includes an elastic element. When the cover is covered on the receiving portion, the driver drives the shaft to make the elastic element generate an elastic force. When the cover is disengaged from the receiving portion by an external force, the elastic force drives the shaft to be moved from one end to an opposite end of the slot to open the cover.