Patent ID: 8376115

Claim:
A bidirectional self-locking device, characterized in that, the device comprises a housing, a gear shaft and a central shaft; a first locking device consisting of a first locking cam, a first locking element and a second locking element and a second locking device consisting of a second locking cam, a third locking element and a fourth locking element are disposed in the housing; the central shaft has one end connected with the gear shaft and the other end sequentially passing through the first locking cam and second locking cam; the first locking element and the second locking element are disposed at an outer side of the first locking cam so as to be connected end to end, when an external force is present to act on the central shaft through the gear shaft so that the first locking cam tends to rotate in a first direction, the first locking element and the second locking element tend to move radially outward and thus tightly press against an inner wall of the housing so as to form a locking engagement; the third locking element and the fourth locking element are disposed at an outer side of the second locking cam so as to be connected end to end, when an external force is present to act on the central shaft through the gear shaft so that the second locking cam tends to rotate in a direction opposite to the first direction, the second locking cam is rotated, such that the third locking element and the fourth locking element tend to move radially outward and thus tightly press against the inner wall of the housing so as to form a locking engagement; a first spring is connected to the first locking element and the fourth locking element, and a second spring is connected to the second locking element and a third locking element, such that as any one of the first locking device and the second locking device is rotated, the other one is rotated synchronically.