Fluid handling – Systems – Plural noncommunicating flow paths
Patent
1977-01-13
1978-10-10
Rosenthal, Arnold
Fluid handling
Systems
Plural noncommunicating flow paths
251 57, 251 77, 403 31, 212 39MS, 192129A, F16K 3144
Patent
active
041191188
ABSTRACT:
Fluid links are interposed between manual levers which control the motions of a machine such as a construction crane and associated spool valves which regulate the machine motions. In normal operation within predetermined safe limits of machine motions, pressurized fluid delivery valve means connected with the fluid links is conditioned by a normal signal from a safe machine motion sensing means and delivers pressurized fluid to the fluid links rendering the links "hard" so that the manual levers are enabled to effect safe machine motions. When an unsafe machine motion is sensed by the sensing means, the valve means responds to the interruption of the normal signal from the sensing means and is conditioned to interrupt delivery of pressurized fluid to the fluid links thus rendering the links "soft" and thus disabling the manual levers from causing machine motions beyond safe limits.
REFERENCES:
patent: 2491279 (1949-12-01), Rogers et al.
patent: 3062587 (1962-11-01), Miller
patent: 3286465 (1966-11-01), Cerles et al.
patent: 3298658 (1967-01-01), Alyea
Rosenthal Arnold
Walter Kidde & Company, Inc.
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