Automatically positionable chair

Details Automatically positionable chair Automatically positionable chair

1989-03-31

1990-09-11

Ro, Bentsu

Electricity: motive power systems

Positional servo systems

318286, 318468, 318484, G05B 1101, A47C 102

Patent

active

049565923

ABSTRACT:
A programmable automatic positioning chair for medical application. The chair has moveable support surfaces which are driven by electric motors to preprogrammed positions. Motor speed is determined by measuring the motor current, and the motor speed is integrated by a microprocessor to produce a computed value of surface position. The chair operates "open loop" without any feedback from position sensors.

REFERENCES:
patent: 4258301 (1981-03-01), Kawa
patent: 4423365 (1983-12-01), Turner
patent: 4486797 (1984-12-01), Workman
patent: 4490659 (1984-12-01), Hansen
patent: 4503374 (1985-03-01), Sakano
patent: 4516805 (1985-05-01), Leeper et al.
patent: 4706194 (1987-11-01), Webb et al.
patent: 4845415 (1989-07-01), Steely
patent: 4874995 (1989-10-01), Kawai et al.

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