Folding desk

A folding desk, comprising a desk body and a desk board, wherein the desk body comprises four support mechanisms, two first linkage mechanisms and two second linkage mechanisms, the support mechanisms comprise upright rods and cross beam rods with ends hinged together, four upright rods are distributed in a rectangle, and first connection pieces slidable along the upright rods are disposed on the upright rods respectively;

• the two upright rods at short sides of the rectangle are connected by the first linkage mechanism, each of the first linkage mechanisms comprises two first linkage rods intersected and hinged to each other at a first intersection point, upper ends of the two first linkage rods are hinged respectively to upper ends of the two upright rods while lower ends of the two first linkage rods are respectively hinged to two first connection pieces;
• two upright rods on long sides of the rectangle are connected by the second linkage mechanism, and each of the second linkage mechanisms comprises a second connection piece and four second linkage rods;
• wherein,
• upper ends of two second linkage rods are hinged to the second connection piece and lower ends of the two second linkage rods are hinged to corresponding first connection pieces;
• lower ends of the other two second linkage rods are hinged to each other and upper ends of the other two second linkage rods are respectively hinged to upper ends of the corresponding two upright rods;
• two second linkage rods between the upright rod and the second connection piece are intersected and hinged to each other at a second intersection point;
• two cross beam rods on a same long side of the rectangle are placed on the second connection piece and located in a same straight line;
• and
• the desk board is placed on the four cross beam rods;
• wherein a placement groove for placing the cross beam rod is disposed on the second connection pieces respectively, a first positioning hole is disposed on a sidewall of the placement grooves, a V-shaped spring sheet is mounted inside the cross beam rods, and the V-shaped spring sheet comprises a positioning protrusion and a press column both penetrating through the cross beam rod.