Aerosol-generating device comprising a cover element

An aerosol-generating device, comprising:

• a housing comprising an end wall;
• a cavity configured to removably receive an aerosol-generating article;
• an aperture at least partially defined by the housing, wherein the aperture extends through a first portion of the end wall and wherein the aperture is disposed at an end of the cavity and configured for insertion of the aerosol-generating article into the cavity through the aperture;
• a cover element configured for rotational movement with respect to the housing, and being rotatable between a closed position in which the cover element entirely covers the aperture and an open position in which the aperture is entirely uncovered and the cover element overlies a second portion of the end wall, wherein the cover element comprises a cover portion and a shaft portion extending orthogonally from the cover portion, wherein the cover portion is configured to entirely cover the aperture when the cover element is in the closed position, and wherein the shaft portion is received within the housing;
• a heater arranged to heat the aerosol-generating article when the aerosol-generating article is received within the cavity, wherein the heater comprises an electrical heater positioned within the cavity, and wherein the electrical heater is arranged to extend around an outer surface of the aerosol-generating article received within the cavity;
• and
• a biasing mechanism configured to bias the cover element away from the open position and towards the closed position,
• wherein the biasing mechanism comprises a torsion spring, a first gear connected to the shaft portion of the cover element, and a second gear connected to the torsion spring, and
• wherein the first gear is engaged with the second gear and is configured to translate torque from the torsion spring to the shaft portion.