B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
138/88.1
B66B 11/04 (2006.01) B66B 1/04 (2006.01)
Patent
CA 1158961
17 49,063 ABSTRACT OF THE DISCLOSURE A hydraulic system having a single acting, multi-stage, synchronous hydraulic jack having a trapped oil space which provides the required synchronism. The hydraulic system additionally includes a first external pump in fluid flow communication with an oil space dis- posed between the outer cylinder and an intermediate section, and a second external pump disposed in fluid flow communication with the trapped oil space between the intermediate section and an inner plunger section. Oil leakage from the trapped oil space is detected when the sections are retracted. The next time the sections are to be extended following such detection, both pumps are auto- matically started, with the second pump being deactivated when the trapped oil space has been replenished.
391899
Oldham And Company
Westinghouse Electric Corporation
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