Patent ID: 8820128

Claim:
An anti-picking device for a lock, comprising: a casing having a first end, a second end and a compartment, wherein the first and second ends serve as two opposite ends of the casing in an axial direction, the first end has a first opening while the second end has a second opening, and the first and second openings communicate with the compartment; a rotating body rotatably received in the compartment, wherein the rotating body has a first end face facing the first opening, a second end face facing the second opening, an actuated member adapted to rotate the rotating body about a central axis of the casing within a rotation range, and an insertion hole extending from the first end face to the second end face in the axial direction to form a third opening in the first end face and a fourth opening in the second end face; a key guiding seat received in the compartment and having an arc guiding groove and a receiving hole, wherein the arc guiding groove communicates with the receiving hole, and the receiving hole penetrates through the key guiding seat in the axial direction; and a linking member rotatably received in the receiving hole of the key guiding seat and having an engaging part at a first end while a second end of the linking member extends away from the rotating body and out of the receiving hole, wherein the third opening keeps in an opening range of the first opening when the rotating body rotates within the said rotation range for the insertion hole to communicate with or be apart from the receiving hole, wherein the rotating body is rotatable about the central axis of the casing, wherein the casing and the key guiding seat are non-rotatable about the central axis of the casing, and wherein the first end of the casing is flush with the first end face of the rotating body.