| 摘要 |
PURPOSE:To improve accuracy of positioning and realize compactness of the size of a hydraulic device, by concentrically combining an pneumatic cylinder mechanism and an oil hydraulic one, and connecting the forward and the rear chambers of said oil hydraulic cylinder mechanism to each other via a control valve member. CONSTITUTION:An inner cylinder 2, a hollow rod 5, a piston 3, and an outer cylinder 4 are assembled together closely fitting each other. A chamber between said inner cylinder 2 and said hollow rod 5 being made as a rear chamber 6 for hydraulic use, while one side chamber between said outer cylinder 4 and said piston 3 to be the forward chamber 7 for hydraulic use and the other side as a pneumatic chamber 8. Said forward chamber 7 and said rear chamber 6 are connected to each other by an oil passage 11 which is provided with a control valve part 9. Due to the above construction, this combined cylinder mechanism can be driven pneumatically, with its stoppage controlled by the oil hydraulic pressure. Thus accuracy of positioning can be improved, and also the size of the device can be made compact, as the pneumatic and hydraulic cylinders are concentrically assembled.
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