Telescopic ladder

A telescopic ladder, comprising a ladder body, wherein the ladder body comprises a plurality of layers of left ladder tubes and right ladder tubes sleeved with each other, the upper left ladder tube and the upper right ladder tube are sleeved in the lower left ladder tube and the lower right ladder tube, each layer of the left ladder tube and the right ladder tube is provided with a crossbar pedal, and both ends of the crossbar pedal on each layer are connected to the left ladder tube and the right ladder tube on each layer;

• a locking assembly is arranged in the crossbar pedal, and the locking assembly comprises an insertion rod movably arranged in the crossbar pedal and abutting against outer walls of the left ladder tube and the right ladder tube, an elastic member with one end connected to the insertion rod, and a hook member movably connected to the insertion rod, wherein the hook member is partially exposed on a lower surface of the crossbar pedal;
• a rotating groove is formed in the crossbar pedal, the hook member is provided with a rotating rod in a protruding manner, the hook member is arranged in the rotating groove through the rotating rod and rotates around the rotating rod, an upper end of the hook member is connected to the insertion rod and drives the insertion rod to move transversely outward or inward through rotation, and an insertion portion is arranged at a lower end of the hook member;
• a connecting part is arranged at an upper end of the crossbar pedal in a protruding manner, and an insertion slot is formed on the connecting part;
• when the upper left ladder tube and the upper right ladder tube move downward to be sleeved into the lower left ladder tube and the lower right ladder tube, the hook member rotates to drive the insertion portion to insert into the insertion slot, and in this case, the insertion rod in the lower crossbar pedal abuts against the outer walls of the upper left ladder tube and the upper right ladder tube, thereby preventing the insertion portion from disengaging from the insertion slot;
• an abutment portion is further arranged at a lower end of the hook member, after the upper left ladder tube and the upper right ladder tube move downward, the abutment portion on the upper hook member in the upper crossbar pedal abuts against the connecting part on the lower crossbar pedal, the upper crossbar pedal continues to move downward, and in this case, the connecting part on the lower crossbar pedal pushes the abutment portion of the upper hook member to rotate inward;
• in this case, the hook member in the upper crossbar pedal rotates around the rotating rod and drives the insertion portion to insert into the insertion slot in the connecting part of the lower crossbar pedal, and the insertion rod, driven by the rotation of the upper end of the hook member, moves transversely inward to mechanically compress the elastic member;
• and
• lower insertion holes are formed at lower ends of the left ladder tube and the right ladder tube, when the upper crossbar pedal is pulled upward, the upper left ladder tube and the upper right ladder tube move upward, when the lower insertion holes at lower ends of the upper left ladder tube and the upper right ladder tube are flush with the insertion rod in the lower crossbar pedal, the insertion rod in the lower crossbar pedal is released, moves outward, and is inserted into the lower insertion hole, the hook member rotates around the rotating rod and drives the insertion portion to disengage from the insertion slot, and in this case, the upper crossbar pedal is pulled away from the lower crossbar pedal.