US PATENT SUBCLASS 60 / 533
.~ Pulsator

Current as of: June, 1999
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60 /   HD   POWER PLANTS

325  DF  PRESSURE FLUID SOURCE AND MOTOR {47}
533.~ Pulsator {25}
534  DF  .~.~> Having signal, indicator or recorder of apparatus condition {1}
536  DF  .~.~> Plural correlated pulsators transmitting unlimited rotary input to unlimited rotary output
537  DF  .~.~> Programmed, self-cycled or self-pulsed {7}
545  DF  .~.~> Having electricity or magnetically operated structure
546  DF  .~.~> Pulsator synchronizes movement of plural outputs
547.1  DF  .~.~> With control of or by a separate power fluid, etc. {9}
561  DF  .~.~> Pressure balancing free piston or diaphragm between parallel pulsators
562  DF  .~.~> Master piston of one pulsator circuit drives master piston of a parallel circuit through a resilient, fluid or lost motion connection
563  DF  .~.~> Expansible chamber of output pressurized directly by motive fluid and indirectly by a master driven by the motive fluid {1}
565  DF  .~.~> Master and diverse non-pulsator drive of output member or members {1}
567  DF  .~.~> Including plural separately operable master actuators or master units driving a common slave
568  DF  .~.~> Having distinct means for holding a pulsator element in set position {2}
571  DF  .~.~> Double-acting slave unit or opposed slaves having a single output {1}
574  DF  .~.~> Automatic control of plural stage pressure generation or utilization {3}
579  DF  .~.~> Slave of first master drives master of another slave {1}
581  DF  .~.~> Plural structurally related master pistons, cylinders or pulsator circuits
582  DF  .~.~> Having safety standby structure becoming operative upon apparatus malfunction
583  DF  .~.~> Pulse fluid vessel embracing output piston and fluid displacing element
584  DF  .~.~> Having separately and manually operated structure for charging, discharging bleeding, or adjusting pulsator volume
585  DF  .~.~> Holder for reserve liquid feeds master {3}
590  DF  .~.~> Condition responsive device limits return flow from biased slave
591  DF  .~.~> Having valve, director, or restrictor in pulse fluid flow path
592  DF  .~.~> Having, surge chamber, fluid supply means, or means compensating for fluid expansion, contraction or leakage
593  DF  .~.~> Having fluid motor driving piston of master unit
594  DF  .~.~> Having cam, or lever system driving master

DEFINITION

Classification: 60/533

(under subclass 325) Apparatus comprising (1) a system including structure to trap a definite volume of motive fluid between two expansible chamber devices for movement back and forth, one expansible chamber device functioning as a transmitter or master to pressurize the fluid and the other

as a receiver or slave actuatable in response to the pressurization of such fluid, wherein any movement of a working member of one device results in movement of the working member of the second device and the systems provides (a) at least two different cross-sectional areas through which the pressurized fluid must pass or (b) the volumetric displacement of the master and slave are unequal; or (2) subcombinations specialized to such system not specifically classified elsewhere.

(1) Note. The output of the pulsator must be the final output of the organization claimed and not merely an intermediate link, or ancillary to a larger organization.

(2) Note. The following are examples of specialized subcombinations of pulsators classified in Class 60: (a) An expansible chamber type motor device for which the claimed nominal load is an expansible chamber solely disclosed as the master of a pulsator; (b) An expansible chamber device having an associated holder for a reserve supply of liquid and solely disclosed as the master of a pulsator, i.e., master cylinder; (c) A piston or diaphragm device disclosed in a pulsator line acting to limit the travel of fluid between the master and slave to a back and forth movement equal to the displacement of the diaphragm or piston;(d) A pressure responsive unit disclosed in a flow line between a master and slave that first passes fluid from the master toward the slave and then, responsive to pressure, acts as a master driven by the first master to drive fluid toward the slave.

(3) Note. A glossary of terms related to this and indented subclasses is at the end of this subclass.

SEE OR SEARCH CLASS

74, Machine Element or Mechanism, 583, for a residual machine element for transmitting motion by push and pull movement including a trapped body of fluid.

91, Motors: Expansible Chamber Type,

280, for a motor having a pulsator cyclically distributing motive fluid to the motor; subclass 384 for a pulsator feeding back a working member's position to a motive fluid controller; subclass 460 for a motor having a pulsator controlled valve; and appropriate subclass for a valved expansible chamber motor per se, or driving a merely nominal load. However if a claimed nominal load is solely disclosed as the master of a pulsator the combination is classifiable in Class 60 subclasses 533+.

92, Expansible Chamber Devices,

61+, for a system of plural expansible chamber devices of the Class 92 type not in a master-slave relationship. (See Paragraph A of (4) Note of the Class 92 definition for a

statement of the line); and appropriate subclass for a master or slave device, per se. See (3) Note, above for exceptions to this line between Classes 60 and 92 (e.g., relating to a master cylinder etc.)

188, Brakes,

151+, for a specific motion stopping or retarding means operated by a fluid pressure system and subclasses 266+ for an internal resistance motion retarder (e.g., hydraulic shock absorber, dash pot etc.).

251, Valves and Valve Actuation,

57, for a valve actuated by a fluid link or column (e.g., pulsator, etc.).

267, Spring Devices,

118+, for a fluid type spring device. Class 267 takes a device comprising a chamber provided with a movable wall (e.g., piston and cylinder) and adapted to contain a fluid designed to contact and exert a force against said movable wall, or an element of such device (e.g., piston) when there is a disclosure that such device is used as a spring device. 303, Fluid-Pressure and Analogous Brake Systems, appropriate subclass for a system specialized to the distribution of fluid in a brake system. The line between Class 303 and

533+, of Class 60 as to pulsator structure in a brake system is as follows:

(1)

A pulsator with structure specializing it for use in braking; or in which the output of the pulsator includes more than nominal brake structure is in Class 303. The following are examples of features in a pulsator device specializing the pulsator for use as a brake system for Class 303. (a) A valve controlled by the inertia of an element braked. (b) A structure responsive to the load on the vehicle to modify the brake action. (c) A distributor not itself a master, that apportions fluid between differently loaded brake cylinders. (d) A device responsive to the disconnection of a trailer from a tractor for actuating the trailer brakes.

(2)

A complete pulsator comprising a master and slave not specialized as in 1 above; or in which the slave drives merely a nominal brake is in Class 60 subclasses 533+. The following terms are examples of brake recitations which are considered to be nominal and will not preclude classification in subclasses 533+. (a) Wheel cylinder; (b) Brake means; (c) Brake cylinders; (d) Hydraulic vehicle brakes; (e) Vehicle brakes (f) Disc brakes; (g) Brakes (h) front and/or rear

wheel brakes; (i) Dual brakes.

(3)

Class 60 subclasses 533+ will take a master subcombination of a pulsator that is of the type specified in above and in the search class references to Classes 92 and 417 even though disclosed as a part of a brake system.

(4)

Class 303 takes fluid brake systems or subcombinations thereof not classifiable elsewhere; e.g., an air brake system or a specialized distributing valve, per se, etc. See the reference to Class 137 in the class definition of Class 303 for the line between classes 137 and 303.

417, Pumps, 321+, for a residual motor driven pump not solely disclosed as a master and subclasses 383+ for a pump that is more than a mere nominal load driven by a pulsator.

MASTER

An expansible chamber device which provides a contracting volume to expel fluid from the chamber or to place the fluid therein under pressure. All valve means or chamber means associated with the expansible chamber device are included under this definition.

MASTER CYLINDER

An art term applied to a unitary assembly of a master and its associated holder of a reserve supply of make-up fluid.

MOTIVE FLUID

Fluid that acts to drive a motor. The term is generic to "pulse" fluid and "power" fluid.

OUTPUT MEMBER

An element of the system by which driving or loading force is delivered for utilization by means other than the system itself.

POWER FLUID

An externally energized fluid that powers a pulsator system. Pulsator circuit: The combination of elements in which the pulse fluid is trapped.

PULSATOR SYSTEM An organization of which a pulsator circuit is merely a part.

PULSE FLUID

The definite volume of fluid trapped in the pulsator.

SLAVE

An expansible chamber device which provides an expanding volume to receive pressurized fluid or a pressure transmitted through a passage connecting the slave to the master transmitter. The slave includes all valve means or chamber means associated therewith.