Patent ID: 7849719

Claim:
A locking device, comprising: a housing; an axle inside said housing having an axial channel for installing a knob, a lever, a driving rod and a pole, said lever and said pole extended orthogonally to each other from a circumference of said axle, said pole and said driving rod extended orthogonally to each other from a circumference of said axle; a torsion spring inside said housing having an end connected to said pole; a bolt inside said housing above said axle having a trough in a rear section of said bolt, an end of said lever distant from said axle being embedded in said trough; a positioning plate inside said housing having an elongated opening inside which said axle is embedded, and two protrusions on a side of said positioning plate, said positioning plate having a lower edge provided with two pushing rods between which is arranged said driving rod of said axle; a cylinder inside said housing adjacent to and above said rear section of said bolt having a key hole and an activation bar extended from a circumference of said cylinder; and a latch at a side to said cylinder for positioning said cylinder; wherein, when a key inside said key hole or said knob is turned, said axle will be rotated thereby causing said driving rod to push said pushing rods of said positioning plate, and said lever of said axle, through embedment in said trough of said bolt, pushes said bolt outside or inside of said housing so that said lever pushes or pulls said bolt in the same directions as said key or said knob is turned.