Motors: expansible chamber type – Working member position responsive motive fluid control – Bypassing between expanding chamber and closed or throttled...
Patent
1996-03-01
1998-07-14
Lopez, F. Daniel
Motors: expansible chamber type
Working member position responsive motive fluid control
Bypassing between expanding chamber and closed or throttled...
91401, 91437, F15B 1522
Patent
active
057787557
ABSTRACT:
A novel adjustment assembly for use with a hydraulic control apparatus. The hydraulic control apparatus is attached to a hydraulically operated tool to provide a desired hydraulically powered function. The present invention allows the hydraulic control apparatus to be used with either a constant volume (open-center) hydraulic system or constant pressure (closed-center) hydraulic power system. The novel adjustment assembly of the present invention provides a structure which can be configured to force open shuttle spool valves in the control apparatus in a neutral condition for use with a constant volume power supply. The adjustment assembly can also be configured to be disengaged from the shuttle spool valves in a neutral condition for use with a constant pressure hydraulic power system. Operation of the adjustment assembly is made using standard tools and without disassembly of the control apparatus.
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Greenlee Textron Inc.
Lopez F. Daniel
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