Patent ID: 8534814

Claim:
An ink cartridge configured to be installed in a cartridge installation portion of a recording apparatus in an installation direction, the ink cartridge comprising: a body having a front side at which an ink supply portion is located for supplying ink stored in an ink chamber to an exterior of the ink chamber, and a rear side opposite the front side; a particular interface positioned substantially adjacent to the ink supply portion at the front side, wherein the particular interface is configured to be biased by a biasing member in a specific direction; and an engagement portion protruding from a surface of the body and configured to protrude into and be engaged with a locking section of the cartridge installation portion for retaining the body in an installed state, wherein the surface of the body is formed with a recess in which the engagement portion is received during installation until the recess is aligned with the locking section, wherein the body includes an upper surface and a bottom surface opposite to the upper surface, the upper surface extending from a front surface positioned at the front side to a rear surface positioned at the rear side, and wherein the engagement portion protrudes from the bottom surface and the bottom surface is formed with the recess, and wherein the engagement portion is configured to engage the locking section for restraining the body in the installed state from moving in the specific direction against a biasing force of the biasing member, wherein the engagement portion comprises a first guide surface and a second guide surface, and wherein the first guide surface and the bottom surface define a first angle therebetween and the second guide surface and the bottom surface define a second angle therebetween greater than the first angle, and wherein the second guide surface is connected to the first guide surface and positioned closer to the rear surface than the first guide surface to the rear surface, the first guide surface having a leading end in the installation direction and a trailing end in the installation direction and connected to the second guide surface, and the second guide surface having a leading end in the installation direction and connected to the trailing end of the first guide surface and a trailing end in the installation direction, the first guide surface being slanted with respect to the installation direction such that the trailing end of the first guide surface is positioned farther from the bottom surface than the leading end of the first guide surface from the bottom surface, and the second guide surface being slanted with respect to the installation direction such that the leading end of the second guide surface is positioned farther from the bottom surface than the trailing end of the second guide surface from the bottom surface.