Power plants – Pressure fluid source and motor – Ram driven by fluid pumped from reservoir
Patent
1998-09-03
2000-03-14
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Ram driven by fluid pumped from reservoir
60 479, 91519, F16D 3102
Patent
active
060356359
ABSTRACT:
The invention relates to an improved hydraulic quick lifting unit used in a jack, especially to improvements made on the valves of the hydraulic system, a fastener assembly and an oil return tube of the lifting shaft. The hydraulic system can return hydraulic liquid to the outer oil reservoir in a slow rate when the lifting shaft according to the invention bears a load. Thus the lifting shaft moves down slowly. When the load on the lifting shaft is removed, the hydraulic liquid flows back to the outer oil reservoir in a larger quantity in a short time. Hence the lifting shaft can quickly return to the its original position. Further, the fastener assembly is located between the lifting shaft and the mandrel, which has the advantages of enhancing the accuracy of the clearance between the mandrel and the inner oil reservoir of the lifting shaft, and preventing the positional shift of the mandrel in the inner oil reservoir. The invention has the benefit of enhancing the stability of product performance.
REFERENCES:
patent: 2398558 (1946-04-01), Reimuller
patent: 2539739 (1951-01-01), Grime
patent: 3134232 (1964-05-01), Barosko
patent: 3581499 (1971-06-01), Barosko
patent: 3740952 (1973-06-01), Fujii
patent: 3782689 (1974-01-01), Barosko
patent: 3890684 (1975-06-01), Tallman
patent: 4339942 (1982-07-01), Svensson
patent: 4567911 (1986-02-01), Kedem
patent: 4641815 (1987-02-01), Yu
patent: 5755099 (1998-05-01), Hung
patent: 5937647 (1999-08-01), Hung
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