US Patent 9146500 Developer accommodating unit

A developer accommodating unit for accommodating a developer includes a flexible container, provided with an opening for permitting discharge of the developer, for accommodating the developer, and a frame. The flexible container is provided with a fastening hole for fastening said flexible container in said frame. The frame includes a fixing shaft portion fixed in the fastening hole by being inserted into the fastening hole, and includes a retaining portion for preventing the fixing shaft portion from being disengaged from the fastening hole. The fastening hole is locked by fitting the fastening hole around the fixing shaft portion while an edge of the fastening hole rides over the retaining portion by elastic deformation thereof.