Patent ID: 7386251

Claim:
A toner supply container detachably mountable to an image forming apparatus, comprising: a rotatable toner containing portion for containing toner; a toner discharging portion projected from one end, of said toner containing portion, with respect to a direction of a rotational axis, of said toner containing portion, said toner discharging portion having a cross-sectional area which is smaller than a cross-sectional area of said toner containing portion, and having an opening, which is formed in a peripheral portion thereof, for permitting discharging of the toner; and a coupling member provided on the end of said toner discharging portion, including a coupling engagement portion engageable with a hole formed in a peripheral portion of a cylindrical member provided with the image forming apparatus to receive a rotational driving force for discharging the toner from the cylindrical member, wherein said coupling engagement portion includes a rotational force receiving projection having a side for receiving the rotational driving force from a rib disposed at a circumferential end of the hole formed in the cylindrical member, and is elastically deformable in a radial direction so that said rotational force receiving projection is engaged with the hole of the cylindrical member.