Patent ID: 6598713
Filing Date: 2003-07-29
Classification: B23B,B23Q,B25B,F15B

Abstract:
A hydraulic locking device, comprising:a rod; a sleeve body fitting outside said rod; said sleeve body having an elastically deformable thinned tube part; a case member supporting said sleeve body; an outer periphery hydraulic pressure chamber on an outer periphery of said thinned tube part of said sleeve body; a hydraulic intensifier inside said case member, having a discharge part continuous with said outer periphery hydraulic pressure chamber; an input port for supplying input hydraulic pressure from an: exterior of said hydraulic locking device to an input oil chamber of said hydraulic intensifier; oil being sealed in said outer periphery hydraulic pressure chamber and said discharge part; said hydraulic intensifier having an annular piston member fitted outside said sleeve body and an annular input hydraulic chamber; said discharge part of said hydraulic intensifier is on an outer periphery of said thinned tube part of said sleeve body; and said rod being locked by driving said hydraulic intensifier with said input hydraulic pressure, said annular piston having an annular large diameter part proximal said input port and an annular smaller diameter part proximal said outer periphery hydraulic pressure chamber, whereby a hydraulic pressure that is higher than said input hydraulic pressure is generated in said outer periphery hydraulic pressure chamber to elastically deform said thinned tube part of said sleeve body to a smaller diameter frictionally locking said rod.