US Patent 11938491 Surface cleaning apparatus

A hand vacuum cleaner has a cyclone assembly positioned in the air flow path, the cyclone assembly comprising a cyclone chamber, the cyclone chamber having a front end, a rear end, a cyclone axis of rotation extending between the front and rear ends, a cyclone air inlet and a cyclone air outlet provided at the rear end of the cyclone chamber, wherein the rear end is rotationally moveable by a rotational mount between a closed position in which the cyclone is closed and an open position wherein a rear portion of the cyclone is open.