Manual lifting-lowering computer table

A manual lifting-lowering computer table, comprising:

• a table board and a keyboard board, wherein the keyboard board is arranged under the table board, sliding seats are arranged on both sides of a bottom surface of the table board, a group of bases parallel to the sliding seats are arranged under the table board, and a first supporting foot and a second supporting foot are arranged on the bases, wherein a middle part of the first supporting foot and a middle part of the second supporting foot are hinged through a connecting shaft, and one ends of the first supporting foot and the second supporting foot away from the bases are arranged on the sliding seats respectively;
• the first supporting foot is provided with a supporting telescopic device, wherein an upper end of the supporting telescopic device is hinged on a connecting seat, and the connecting seat is arranged at one end of the sliding seat adjacent to the keyboard board;
• a lower end of the supporting telescopic device is arranged on an upper part of the first supporting foot;
• a hinge joint between the lower end of the supporting telescopic device and the first supporting foot is arranged on an outer side of the first supporting foot, the outer side of the first supporting foot faces the second supporting foot, and the hinge joint between the lower end of the supporting telescopic device and the first supporting foot is located between the first supporting foot and the second supporting foot;
• the hinge joint between the lower end of the supporting telescopic device and the first supporting foot is located above the connecting shaft;
• a side wall of the sliding seat is provided with a handle connecting plate extending downward, an outer side of the sliding seat is provided with a handle, and a top end of the handle is provided with a handle shaft extending laterally inward, wherein the handle shaft is penetrated in the handle connecting plate;
• one end of the handle shaft away from the handle is provided with a handle shaft support, wherein a top portion of the handle shaft support is provided with a driving strip, and the top portion of the handle shaft support is hinged with an end portion of the driving strip;
• a hinge axis of the handle shaft support and the driving strip is parallel to a connecting axis of the handle shaft and the handle shaft support;
• one end of the driving strip away from the handle shaft support is provided with a bent clamping piece, and the bent clamping piece is provided with an upper connecting hole and a lower connecting hole that are longitudinally arranged;
• the lower connecting hole of the bent clamping piece is hinged with the driving strip, the upper connecting hole of the bent clamping piece is hinged to an abutment seat, a bending part of the bent clamping piece is arranged in a positioning groove of a clamping block, and the clamping block is arranged in the sliding seat and is hinged with a top end of the second supporting foot.