Patent ID: 7644454

Claim:
A mechanical lifting system for lifting a person from a sitting position to an upright position, comprising: a seat; a standing frame including a pair of lifting sets working in parallel and activated by a control system, wherein each of the pair of lifting sets includes: a vertical side support unit, a plurality of connectors, a knee support, a hand handle, a working element formed of a gas spring, an electric spring or a hydraulic actuator, and a control system for controlling the working element, wherein the vertical side support includes a bottom segment and a top segment, the bottom segment includes a vertical element, the top segment includes two parallel elements connected at a lower portion by a first swivel joint with an upper portion of the bottom segment, an upper portion of the top segment is connected by a second swivel joint with a connector of the plurality of connectors, one end of the working element is fixed to the top segment in a position below the connector, and another end of the working element is fixed to the bottom segment at a position below a fixing place of the knee support.