CAPSULE EVACUATING APPARATUS OF COMBINATION OF HYDRAULIC SLOW-DESCENDING MACHINE WITH SPRING AND RAIL

摘要

PROBLEM TO BE SOLVED: To facilitate fast returning to the original position as a load is gone by providing a fine groove inside a cylinder to enable adjusting of the descending speed according to the width of the groove while a piston is provided with a spring and a check valve to soften a shock to the load. ;SOLUTION: In a hydraulic slow-descending machine with a spring, a fine groove 10 and a piston are arranged inside a cylinder and an oil is fed into the cylinder to seal up. A load causes the oil to move from the fine groove 10 and with the movement of the oil, the piston lowers at a fixed speed. At this point, the groove 10 is made less in width both at the upper and lower parts thereof than that at the center thereof to reduce the speed at the points of starting and ending the descending thereby softening a shock to the load. As the load is gone, the piston is lifted by a force of a spring 11. At this point, the check valve 12 provided on the piston is opened and a large amount of oil moves to raise the piston faster than the descending speed and returns to the original position. This enables the adjusting of the descending speed according to the width of the groove.;COPYRIGHT: (C)1998,JPO