Locking device

A locking device, comprising:

• a first shell having a first flange and a second shell having a second flange, the first flange being adapted to be in surface contact with a casing and the second flange being adapted to be in surface contact with a cover, the first shell being provided with a locking housing in which a catch hole is formed, the second shell being provided with a vertical-movement support block to guide a vertical movement of a locking hook by rotation of a handle;
• a housing secured to the second shell to guide an operation of a tilting guide;
• the tilting guide resiliently provided inside the housing via a wire spring to guide a movement of the locking hook;
• the locking hook configured to be caught by the catch hole to set a locking state or removed from the catch hole to release the set locking state, while the locking hook moves along the tilting guide by a forward or backward rotation of the handle;
• the handle rotatably provided on the tilting guide to move the locking hook forwards or rearwards;
• a vertical moving block protruding from a lower surface of the locking hook, the vertical moving block being guided along the vertical-movement support block to be in line contact therewith, thus moving up the locking hook that is moved forwards when the handle rotates forwards;
• and
• a restoring part connected to the tilting guide and the housing to move down the locking hook and the tilting guide that are moved up while the vertical moving block is in line contact with the vertical-movement support block, thus restoring the locking hook and the tilting guide to original positions thereof.