Patent ID: 8776313

Claim:
A stationery tool comprising: a body having a holding end; a stationery functional end opposite to the holding end; and a holding recess defined in the holding end of the body; a rubber holding device mounted in the holding recess of the body for holding a rubber to adjust an extension length of the rubber relative to the body and comprising an opening defined in the rubber holding device at a position relative to the holding end of the body; and a clamping segment slidably mounted in the holding recess of the body, being slidable between the holding recess and the opening of the rubber holding device to adjust the extension length of the rubber relative to the body and comprising multiple clamping protrusions for pressing against the rubber; and a rotating knob mounted rotatably on the rubber holding device, wherein the holding recess has an inner surface and a positioning segment formed on the inner surface of the holding recess; and the rotating knob has an engaging segment formed on an outer surface of the rotating knob and rotatably engaging the positioning segment in the holding recess.