Patent ID: 8761634

Claim:
A cartridge assembly detachably mountable on a main casing of an image forming device, the cartridge assembly comprising: a first cartridge including a photosensitive drum on which a latent image is to be formed, a first handle, and an engaged portion; and an elongated second cartridge detachably mountable on the first cartridge and including a developing casing, wherein the developing casing includes a developing roller for forming an image on the photosensitive drum, a second handle, and a lock member, the first handle and the second handle being configured in a relative position capable of single-handed simultaneous access to the first and second handles when the first and second cartridges are in an assembled state, wherein the developing casing of the second cartridge continues to support the developing roller and the lock member when the second cartridge has been separated from the first cartridge, wherein the lock member of the second cartridge includes a lock section configured to be engageable with the engaged portion, and an operation section, the lock section being movable between a lock position to prohibit separation of the second cartridge from the first cartridge and an unlock position to permit separation of the second cartridge from the first cartridge, the operation section being configured to move the lock section between the lock position and the unlock position, and the second handle and the operation section being configured in a relative position, capable of single-handed simultaneous access to the second handle and the operation section, wherein the lock member of the second cartridge further includes an opposing section, the opposing section configured to move between the lock position and the unlock position, the second handle of the second cartridge being oriented substantially parallel to the opposing section when the lock member is in the unlock position, and wherein the second cartridge including the developing roller is configured to be pivotable, relative to the first cartridge, about a point arranged on a developing roller side of the second cartridge, and the operation section of the lock member is disposed on a handle side opposite to and distanced from, in an elongated direction of the second cartridge, the developing roller side and disposed below the second handle of the second cartridge such that, when the second cartridge is mounted on the first cartridge, the operation section of the lock member is disposed between the first and second handles, and such that, when the second handle and the operation section are simultaneously operated to be moved upward, the second cartridge pivots, relative to the first cartridge, about the point arranged on the developing roller side.