Extending structure of ladder

The utility model relates to a ladder technical field discloses an extending structure of ladder, including outer tube and scalable interior sleeve pipe in the outer tube, the flexible restriction portion of interior sheathed tube is connected with the bush, the bush lies in between outer tube and the sleeve pipe, the tip setting of outer tube is used for restricting the fastening seat of bush, this extending structure utilizes and rubs between bush and the outer tube when using, and the flexible restriction portion of the internal sheathed tube of bush carries out the structure enhancement simultaneously, realizes double -deck reinforced structure, improved life greatly, and this kind of structure during fabrication, and the size cooperation degree of freedom between interior sleeve pipe and the outer tube is higher, has guaranteed the compact structure nature of ladder. 本实用新型涉及梯子技术领域，公开了种梯子的伸缩结构，包括外套管和可伸缩于外套管内的内套管，所述内套管的伸缩限制部连接有衬套，所述衬套位于外套管和内套管之间，所述外套管的端部设置用于限制衬套的紧固座；本伸缩结构在使用时，利用衬套与外套管之间进行摩擦，同时衬套对内套管的伸缩限制部进