A lifting device (30) for a patient support apparatus (10) is provided. The patient support apparatus (10) includes a frame (14) and a lifting device (30) coupled to the frame (14). The lifting device (30) is configured to move the frame (14) between a raised position and a lowered position. The lifting device (30) includes a motor (202) and at least two canisters (206, 208, 210, 212). The motor (202) is operably coupled to at least one of the canisters (206, 208, 210, 212) to rotate the canister (206, 208, 210, 212).