US PATENT SUBCLASS 91 / 508
PLURAL RELATIVELY MOVABLE OR RIGIDLY INTERCONNECTED WORKING MEMBERS

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

508PLURAL RELATIVELY MOVABLE OR RIGIDLY INTERCONNECTED WORKING MEMBERS {11}
509  DF  .~> Having (1) stand-by or (2) redundant means enabling load to be driven upon failure of primary load moving means {1}
511  DF  .~> Condition responsive means for modifying working member operation {5}
519  DF  .~> With means for selectively changing the speed or force exerted on load by the selective application of motive fluid in a single direction to one or more working members
520  DF  .~> Motors connected in series
521  DF  .~> Separate valve means actuatable by a common nonmanual actuator or separately actuatable means with common manual actuator {3}
525  DF  .~> With means to control the working fluid to one working member for movement relative to another without controlling the working fluid to the other working member by said means {4}
532  DF  .~> With means for proportioning motive fluid supply to plural motors
533  DF  .~> Single valve for plural rigidly connected working members
534  DF  .~> Single valve for relatively movable working members driving common load
535  DF  .~> Relatively movable working members of unequal cross-sectional areas
536  DF  .~> Single valve for relatively movable working members

DEFINITION

Classification: 91/508

PLURAL RELATIVELY MOVABLE OR RIGIDLY INTERCONNECTED WORKING MEMBERS:

(under the class definition) Apparatus having plural working members which are either (a) relatively movable, or (b) connected to move together as a unit under all conditions of operation and which have different faces forming moving walls of different working chambers which regardless of the positions of the different faces are not in fluid communication during at least some part of the operation of said apparatus, said faces being urged in the same direction either simultaneously or sequentially by working fluid in said chambers.

(1) Note. Under this definition, a means o actuate a valve may be part of the motive fluid control means for the plural

working members, but a means to merely prevent or permit actuation of the valve by some other agency has not been considered motive fluid control.

(2) Note. Under this definition, plural expansible chamber type motors disclosed as being of the rotary type are specifically excluded unless otherwise not meeting the valving requirements of Class 418 (see (5) Note on page 91 - 4 of class definitions for relationship to Class 418).

(3) Note. Under this definition, patents disclosing a working member having different single-acting working faces forming moving walls of different working chambers for the sole purpose of causing reciprocation of the working member in opposite directions are not considered to be drawn to plural working members.

SEE OR SEARCH THIS CLASS, SUBCLASS:

6+, for an expansible chamber motor having different faces forming moving walls of different working chambers which are not in fluid communication during at least some part of the operation of said apparatus, communication between the working chambers being responsive to the position of the different faces.

170+, for expansible chamber motors having a plurality of relatively movable working members in which one is controlled by, movably interconnected with, or moved by another. 206+, for expansible chamber motors wherein the cylinder forms a working member and has two separate integral fluid actuated surfaces, one being formed exteriorly of the other.

SEE OR SEARCH CLASS

92, Expansible Chamber Devices,

61+, for expansible chamber devices having relatively movable working members; and subclasses 146+ for plural unitarily mounted cylinders or a frame therefor.