To solve such a problem that a conventional hydraulic system for moving a chair vertically supplies oil to a hydraulic cylinder for vertical movement intermittently by stepping an operation rod with the foot stops the oil every time of the pressing, then, stops the chair every time of the stopping of the oil to the hydraulic cylinder and gives shock to a person to be treated and makes the person feel uncomfortable.
The hydraulic cylinder for moving the chair vertically is constituted of: a foot-operated pump 3 which sucks the oil by moving up of the operation rod 1, discharges the reserved oil by stepping of the operation rod and which discharges the reserved oil by stepping of the operation rod to a most lowered position; a check valve 5 which is opened with hydraulic pressure of the oil discharged from the foot-operated pump, which is opened when the foot-operated pump is lowered to the lowest position and which transmits the oil from a non-return side to return it to an oil tank through the foot-operated pump; the cylinder 7 for vertical movement for vertically moving the chair part connected to the non-return side of the check valve through a flow rate adjusting means such as an orifice; and an accumulator 6 connected in parallel with the flow rate adjusting means on the non-return side of the check valve.
MIYAZAKI MASAYA
HARUNA KAORI
Shinichi Fukuda
Takemichi Fukuda
Kyosuke Kato
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