Abstract: A suitcase and a manufacturing method thereof are disclosed. An upper case shell and a lower case shell are obtained, and a flexible material is fixedly connected to the upper case shell and the lower case shell. When the suitcase is assembled, elastic parts are compressed to install two ends of rods on installation parts of the upper case shell and the lower case shell, and a resilience force from the elastic parts is applied to the rods to drive the upper case shell and the lower case shell to be away from each other, and the flexible material connected to the upper case shell and the lower case shell is driven by the upper case shell and the lower case shell to be tensioned.

Abstract: A lifting positioning structure for a ladder tool platform comprises a ladder. The ladder comprises front supporting legs, rear supporting legs, connectors fixedly connected to the front supporting legs, plug pins, and elastic parts, wherein each front supporting leg includes a big tube and a small tube which are able to relatively move in an extension direction. The connectors are formed with vertically-through installation cavities which allow the big tubes to be inserted therein. The big tubes are arranged in the installation cavities and are fixedly connected to the connectors which extend to form connection parts rotationally connected to the rear supporting legs. The small tubes are connected to a tool platform. The plug pins are movably arranged on the connectors or the big tubes.

Abstract: A telescopic positioning structure used for a ladder is disclosed. The ladder includes a front supporting leg and a rear supporting leg. The front supporting leg includes a first tube and a second tube, and the first tube and the second tube are able to move relative to each other in an extension direction. The rear supporting leg is rotatably connected with the first tube. The ladder further includes a pin connected with the first tube. When the rear supporting leg is unfolded, an upper end of the rear supporting leg abuts against the pin and drives to the pin to move towards the second tube, and when the pin abuts against the second tube, the second tube is positioned.