Patent ID: 6947687

Claim:
A cartridge detachably mountable to a main assembly of an electrophotografic image forming apparatus, said cartridge comprising: a frame; a developing member configured and positioned to develop an electrostatic latent image formed on an electrophotographic photosensitive member; a developer accommodating portion configured to accommodate a developer to be used for developing the electrostatic latent image by said developing member; a cartridge locking portion configured and positioned to lock said cartridge with a main assembly locking portion provided in the main assembly of the apparatus to prevent said cartrige from disengaging from the main assembly of the apparatus when said cartridge is mounted to the main assembly of the apparatus, wherein said cartridge locking portion projects out of or is retracted into each one of and the other end portions of said frame in the longitudinal direction of said developing member; and a releasing member configured and positioned to release said cartridge locking portion to release said cartridge from the main assembly locking portion when said cartridge is to be removed from the main assembly of the apparatus.