| 摘要 |
<p>634,980. Hydraulic intensifiers. BRITISH INDUSTRIAL PLASTICS, Ltd., and GROVES, W. R. March 25, 1948, No. 8869. [Class 69 (ii)] In a hydraulic intensifier of the continuousdelivery, double-acting differential-piston type in which the change of delivery is effected by a main valve 35 controlled by an auxiliary valve operated in synchronism with the piston strokes, passages 14 and 15 are provided to permit low-pressure liquid to act on highpressure pistons 8, 9 during their suction strokes so that the full, low-pressure piston area is effective, and valves 20 and 21 for closing these passages so that a smaller low-pressure piston area is effective. A piston 6 working in a lowpressure cylinder block 1 is integral with a rod 7 and the pistons 8 and 9, the latter working in high-pressure cylinder blocks 2 and 3, respectively, the differential piston thus formed having passages 10 and 11 fitted with non- return valves 12, 13. The passages 14, 15 and the valves 20, 21 respectively connect the blocks 2 and 3 with the block 1. The valve 35 alternately connects the spaces on either side of the piston 6 with an inlet port 38 and an exhaust port 32, since abutments 58 on the rod 7 alternately engage a cam 56 which determines the setting of a 4-way valve 50. Delivery is alternately effected from the passage 14 or 15 through a valve. The valves 20, 21 permit recharging of the cylinders 2, 3 from the inlet 38, but if the valves are locked, recharging is effected through the valves 12 or 13.</p> |
