Readily releasable locking device for a desk

A desk comprising a non-angularly movable elongated shell, an angularly movable flat board disposed to make continuous angular displacement relative to said non-angularly movable elongated shell between a laid-flat position and a lifted-up position, and a readily releasable locking device for guarding against an angular movement of said angularly movable flat board relative to said non-angularly movable elongated shell, said readily releasable locking device comprising:

• a first link bar fixed on said angularly movable flat board and having a first pivot end distal from said angularly movable flat board;
• a second link bar fixed on said non-angularly movable elongated shell and having a second pivot end distal from said non-angularly movable elongated shell;
• a hollow block pivotally mounted to said second pivot end about a second pivot axis, and having a guiding slot which extends transverse to the second pivot axis;
• a guided rod having a connected end pivotally mounted to said first pivot end about a first pivot axis parallel to the second pivot axis, and a rod body extending from said connected end along a lengthwise line to terminate at a free end, said rod body being led to pass through said guiding slot and to extend outwardly of said hollow block, so as to permit said guided rod to be moved relative to said hollow block between a proximate position, where said hollow block is proximate to said first pivot end, and which corresponds to the laid-flat position of said angularly movable flat board, and a distal position, where said hollow block is distal from said first pivot end, and which corresponds to the lifted-up position of said angularly movable flat board;
• a latch member disposed in said hollow block and coupled with said guided rod such that said latch member is displaceable between a first orientation, where said guided rod is retained by said latch member, and a second orientation, where said guided rod is permitted to move relative to said latch member;
• a biasing member disposed in said hollow block to bias said latch member to the first orientation;
• and
• an actuating unit configured to actuate said latch member to move from the first orientation to the second orientation.