To solve a problem in which conventionally when a flow rate changeable pump using a direct current motor with a low cost is used, and in the case when speed control is required, a proportional control valve with a high cost as a flow rate control valve must be used, and therefore, the result is that a product price becomes high and the apparatus becomes to be complicated.
A hydraulic controlling apparatus for chairs or the like is used for an lifting apparatus for medical instruments, operating tables, hairdressing devices or the like, and includes: a pump 2; at least one single operating cylinder 3 for lifting and lowering the lifting apparatus; a first electromagnetic valve 5 for supplying an oil from the pump to the single operating cylinder and elevating the lifting apparatus; a second electromagnetic valve 6 for returning the oil staying in the single operating cylinder to the oil tank and lowering the lifting apparatus; a throttle valve 10 restricting the oil volume of the oil discharged through the second electromagnetic valve; and a controlling part 13 for supplying an oil from the pump into a hydraulic circuit for returning the oil from the single operating cylinder into the oil tank, adjusting the amount of supply of the oil, and controlling the lowering speed of the lifting apparatus by restricting the amount of the oil by constriction of the throttle valve.
KOTO TOMOHIRO
MIZUTANI HAJIME
Shinichi Fukuda
Kyosuke Kato