Patent ID: 7144002
Filing Date: 2006-12-05
Classification: B25B

Abstract:
1. An electric locking device comprising: a body forming an outer shell of the device; a camshaft coupled to an electric motor through a speed reducing mechanism in the body; first and second cams fixed to the camshaft and conjugate with each other; first and second cam contacting members respectively in contact with cam faces of the first and second cams to convert rotational motions of the first and second cams into linear motions in the same direction; an arm driving rod including a supporting rod for supporting the first and second cam contacting members with a constant distance between them in their moving direction and driven in the moving direction by the first and second cam contacting members; and a clamping arm driven by the arm driving rod to carry out a clamping operation, wherein the first cam includes the cam face required for driving the arm driving rod in a clamping direction through the first cam contacting member, the second cam includes the cam face required for driving the arm driving rod in a returning direction through the second cam contacting member, the cam face of the first cam is such a cam face as to move the arm driving rod at a high speed until the clamping arm reaches a vicinity of an end and to move the rod at a lower speed after the arm has reached the vicinity of the end, and the cam faces of the first and second cams are conjugate with each other so that the first and second cam contacting members are always and substantially in contact with the cam faces.