Patent ID: 8459610

Claim:
An assistance mechanism, comprising: a base having a post extending from a top thereof and multiple wheels connected to the base; a rotatable link having a first end pivotably connected to the post and a seat fixedly connected to the rotatable link; a handle unit directly pivotably connected to a second end of the rotatable link; a lifting unit connected to the rotatable link and the base, the lifting unit driving the rotatable link, and a power unit connected to the lifting unit and providing power to the lifting unit, wherein the lifting unit comprises a gear unit and a link unit, the gear unit is connected with the power unit, and the link unit is connected to the gear unit and the rotatable link, and wherein the gear unit comprises a frame, a first gear, a second gear and a fan-shaped gear, the frame is fixed to the base and the first gear is connected to the power unit, the first gear is pivotably connected to the frame, the second gear is co-rotatable with the first gear, the fan-shaped gear is engaged with the second gear, the fan-shaped gear is pivotably connected to the frame, a number of teeth of the second gear is less than that of the first gear, a number of teeth of the fan-shaped gear is larger than that of the second gear.