US PATENT SUBCLASS 91 / 509
.~ Having (1) stand-by or (2) redundant means enabling load to be driven upon failure of primary load moving means

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

508  DF  PLURAL RELATIVELY MOVABLE OR RIGIDLY INTERCONNECTED WORKING MEMBERS {11}
509.~ Having (1) stand-by or (2) redundant means enabling load to be driven upon failure of primary load moving means {1}
510  DF  .~.~> Stand-by means utilizes an auxiliary motive fluid source for another working member to drive same load

DEFINITION

Classification: 91/509

Having (1) stand-by or (2) redundant means enabling load to be driven upon failure of primarily load moving means:

(under subclass 508) Apparatus including a (1) stand-by means becoming operative, or (2) one member of a redundant means remaining operative upon the inability of at least one working member to drive the load, (1) the stand-by means enabling the one working member to once again drive its load, or (2) the stand-by means comprising an auxiliary working member for taking over the function of the one working member.

(1) Note. A working member may become unable to drive the load as the result of a malfunction of its control valve or other associated parts or adjuncts which are necessary to the operation of the said working member.

SEE OR SEARCH THIS CLASS, SUBCLASS:

517, for means controlling the operation of one motor, in response to the pressure in another motor.

519, for apparatus including a controllable first working member and a second working member connected to move with the first working member, and manual means or working member position responsive means for controlling motive fluid to the second working member so that it will aid in the movement of the load of the first working member in the same direction of movement thereof.

SEE OR SEARCH CLASS

60, Power Plants, 420+, for a system having distinct or separately operable outputs and condition responsive means controlling the systems such as selecting from plural pressure sources. See in the definition of Class 60, subclass 325 under "Motive Fluid Source" for a definition of a motive fluid source in terms of Class 60.