| 摘要 |
An operatory-type chair having a seat to which a back rest is pivotably connected for movement between upright and rearwardly extending positions by an electric motor interconnected to said back rest by a rotatable screw driven by said motor. Movement of the back rest is controlled by limit switches which stop the motor when either limit of movement is reached, the invention comprising an adjustable program switch included in said control system which operates to stop the motor when the back rest reaches a desired position intermediately of the opposite limits of movement thereof, as controlled by said limit switches.
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