| 摘要 |
PURPOSE: A three-step toilet cover is provided, which enables a user to easily select a toilet cover by integrally manufacturing toilet covers with three different sizes. CONSTITUTION: A three-step toilet cover is manufactured by the steps of: a step of manufacturing a toilet cover; a step of overlapping a model member which is formed into a cross-sectional shape between toilet covers; and a step of uniting the toilet cover overlapped with the model member by vibration welding. The three-step toilet cover is manufactured so that toilet covers with three different sizes can be overlapped to each other. |
