Patent ID: 8824133

Claim:
An electronic device, comprising: a housing formed with an opening and a through hole; an object removably disposed in said housing and covering said opening, said object being operable to be removed from said housing through said opening; and a fastening mechanism including a nosepiece disposed at one side of said object and located in said housing, said nosepiece including an outer end that faces said opening, and a side surface that extends from said outer end in a direction away from said opening, a rotating unit extending through said through hole and rotatably coupled to said housing, said rotating unit including a wheel body that is disposed in said housing, and a rotating disc that is coupled to said wheel body and that is disposed outside said housing, said wheel body including a peripheral wall and a stop block that protrudes from said peripheral wall and that is operable to abut against said outer end of said nosepiece, said peripheral wall having an outer peripheral friction surface that is disposed in frictional contact with said side surface of said nosepiece, said rotating disc being formed with a first positioning notch, said rotating unit being operable to rotate in a releasing direction relative to said housing to bring said stop block to move away from said outer end and to move said object away from said housing through said opening by virtue of the frictional contact between said outer peripheral friction surface and said side surface of said nosepiece, a torsion spring disposed in said housing and operable to bias said rotating unit in the releasing direction, and a locking unit mounted to said housing and releasably engaging said first positioning notch; wherein said rotating unit is disposed at a stopped position, where said stop block abuts against said outer end of said nosepiece and said object is positioned in said housing, when said locking unit is engaged with said first positioning notch.