Power-Assist Chair Using Pneumatic Actuator
Kazushi Sanada* and Yuki Akiyama**
*Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama City, Kanagawa 240-8501, Japan
**Mechanical Engineering Research Laboratory, Hitachi, Ltd., 832-2 Horiguchi, Hitachinaka-City, Ibaragi 312-0034, Japan
The power-assist chair we propose helps the user stand from a sitting position in the chair and sit down. The pneumatic cylinder pushes the seat up. The seat angle is detected by a rotary potentiometer and force acting on the user’s foot is measured by a force sensor. These signals are input to a computer and cylinder pressure is controlled so the seat simulates a spring. We also propose the concept of motion-sensing control based on real-time modification of a nominal seatangle pattern that, in turn, is based on the difference between a nominal pattern and the actual pattern of the foot force. A pneumatic simulation model was built to ensure power-assist chair use motion-sensing control. Experiment and simulation confirmed that the power-assist chair’s motion-sensing control operated as intended.
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