Patent ID: 8123063

Claim:
A cartridge tank for a lubrication agent, comprising: a container main body in which a lubrication agent is sealed; an installation mouth part which protrudes from the container main body and is provided with an opening into which an oil-supply mouth part of a lubrication pump is inserted; and a cover plug covering the opening of the installation mouth part, wherein the cover plug has a cut groove having a circular circumferential groove having a diameter greater than a diameter of the oil-supply mouth part and a plurality of vertical grooves formed from a center of the circular circumferential groove to the circular circumferential groove, the cut groove is to be cut by the oil-supply mouth part when the installation mouth part is installed in a concave part of the lubrication pump, an outer periphery part formed outside of the circumferential groove, a circular protrusion formed on a front surface of the outer periphery part which abuts a bottom surface of the concave part of the lubrication pump, and another circular protrusion opposing to the circular protrusion formed on a back surface of the outer periphery part which abuts an end of the installation mouth part.