Patent ID: 7382997

Claim:
A sealing member for sealing a toner discharge opening of a toner container, which is detachably mountable to an image forming apparatus including a rotational driving member, which includes a plurality of ribs between which coupling openings are formed, wherein angles, as seen from a center of rotation of the driving member, between positions of adjacent ones of the ribs are equal to each other, said sealing member comprising: a sealing portion for sealing the toner discharge opening; and a rotatable coupling portion including at least two hooks for disengageable hooking engagement with at least one of the coupling openings to receive an unsealing force for unsealing the toner discharge opening by a relative movement between said sealing portion and the toner container, wherein an angle, as seen from a center of rotation of said coupling portion, between positions of said hooks is different from the angles between the positions of the ribs.