Class Definition for Class 303 - FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS

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CLASS 303,	FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS
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SECTION I - CLASS DEFINITION

This class relates to the distribution of fluid to brake motors, i.e., the utilization of fluid-pressure in the operation of brakes.

SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS

Systems for the distribution of pressure fluid to a plurality of motors other than brake motors are, for the most part in Class 60, Power Plants, subclasses 6, 97, 420, 484, and their respective indented subclasses, and Class 91, Motors: Expansible Chamber Type, subclasses 165+ and 508+.

SECTION III - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

60,	Power Plants, subclasses 325+ for a pressure fluid source supply motive fluid to an output motor of general utility, particularly subclasses 533+ a master-slave system. See the Search Class reference to Class 303 in subclass 533 of Class 60 for the line between these classes as to pulsators.
73,	Measuring and Testing, subclass 39 for devices for testing fluid brake systems and triple valves.
91,	Motors: Expansible Chamber Type, subclasses 508+ for a system of plural expansible chamber motors of general utility and appropriate subclass for an expansible chamber motor, per se.
96,	Gas Separation: Apparatus, for apparatus for gas separation, per se, which merely dry or separate foreign matter from gaseous brake fluids or which deaerate brake liquids.
116,	Signals and Indicators, subclass 55 for signal train-pipes supplied with fluid under pressure, the train brake-pipe, when used for signaling, being found in this subclass.
137,	Fluid Handling, appropriate subclasses for fluid handling systems of more general application, and in particular see subclasses 203+ for devices for collecting and discharging condensate from a low point in the system, subclass 381 for shields to protect exposed valves, subclasses 545+ for devices for separating foreign matter from the brake fluid, and subclass 598 for distribution systems including a flow passage between a master cylinder and a brake cylinder and means to control the fluid flow, e.g., "hill holders", and see the Note to the definition of this subclass (598).
188,	Brakes, subclasses 152+ and 154 for application of fluid-pressure operated brakes to motor-vehicles and to all road-vehicles.
246,	Railway Switches and Signals, subclasses 167+ for operations on the air-distribution system from points on the railway-track.
252,	Compositions, for fluids for hydraulic brakes or for other hydraulic devices.
293,	Vehicle Fenders, subclass 5 for the application of a fluid pressure operated brake to a motor vehicle combined with vehicle fender structure.
418,	Rotary Expansible Chamber Devices, for rotary expansible chamber, per se.
700,	Data Processing: Generic Control Systems or Specific Applications, subclasses 1 through 89for generic data processing control systems.

SUBCLASSES

1	MISCELLANEOUS
	Patents not elsewhere classified.

2	MULTIPLE SYSTEMS
	Patents showing systems of distribution to two or more motive devices associated in one system, one of which must be a fluid-pressure motive device.

[List of Patents for class 303 subclass 3]

Fluid pressure and electric

A motor operated by a fluid is associated with an electric motive device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

15,	for distribution of fluid controlled by fluid and electric means.
121+,	for a speed controlled braking system that controls fluid braking pressure.

[List of Patents for class 303 subclass 4]

Fluid pressure and vacuum

Fluid is used at two pressures, the one above atmospheric and the other at atmospheric pressure, in opposition to a partial vacuum.

(1) Note. See this class, subclasses 12 and 31 for cases in which a vacuum alone is used.

[List of Patents for class 303 subclass 5]

MULTIPLE FLUID-RECEIVING DEVICES

The fluid is distributed to a plurality of receivers, one of which must be a brake motor.

(1) Note. Devices which control brake fluid in response to a speed responsive actuating signal have been excluded from this subclass and its indented subclasses and are found in subclasses 121+ below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

30,	for patents in which an additional pipe is used to feed the auxiliary reservoir.
121+,	for speed controlled regulation of braking fluid and, therefore, braking action.

[List of Patents for class 303 subclass 6.01]

6.01

Multiple motors:

This subclass is indented under subclass 5. Subject matter wherein the fluid is distributed to a plurality of fluid pressure operated motors.

(1) Note. The multiple motors are usually differently related to the means for distributing the fluid.

[List of Patents for class 303 subclass 6.1]

6.1

Brake and door

Includes patents in which one of the motors operates a door.

SEE OR SEARCH CLASS:

49,	Movable or Removable Closures, subclass 334 for a motor driven closure and see the search notes thereto for the loci of other closures driven by a motor.
105,	Railway Rolling Stock, the subclasses indented under subclass 238.1 for door operation and door actuators.

[List of Patents for class 303 subclass 7]

Sectional train

The train is divided into a plurality of sections, the fluid being distributed to the sections in different manner.

SEE OR SEARCH THIS CLASS, SUBCLASS:

53,	for motorman"s valves adapted for this service.

[List of Patents for class 303 subclass 8]

Multiple brake valves

The distribution of fluid to the sections of the train is controlled by a plurality of brake-valves.

SEE OR SEARCH THIS CLASS, SUBCLASS:

25,	and 26, for other patents combining automatic and direct distribution.

9	Supplementary in emergency
	Upon a heavy reduction of control-pipe pressure a second motor is brought into operation.

[List of Patents for class 303 subclass 9.61]

9.61

Separate and simultaneous control:

This subclass is indented under subclass 6.01. Subject matter including means for regulating the fluid flow to the motors such that one to the motors may be operated (a) independent of another motor and (b) in unison with the other motor, when desired.

(1) Note. This subclass may also include the sequential control of fluid pressure operated motors.

SEE OR SEARCH THIS CLASS, SUBCLASS:

50+,	for manually controlled valves where details of the manual operation are significant.

SEE OR SEARCH CLASS:

188,	Brakes, subclass 16 and 354 for independently operated brakes.

[List of Patents for class 303 subclass 9.62]

9.62

Apportioning control:

This subclass is indented under subclass 6.01. Subject matter including means for varying the fluid flow to one motor relative to the flow to another motor, e.g., for varying the braking action of a form brake motor with respect to rear brake motor of a vehicle.

SEE OR SEARCH CLASS:

188,	Brakes, particularly subclass 349 for details of apportioning devices brake structure.

[List of Patents for class 303 subclass 9.63]

9.63

Failure responsive:

This subclass is indented under subclass 9.62. Subject matter including a feature which functions when the distribution of fluid ceases to occur properly.

SEE OR SEARCH THIS CLASS, SUBCLASS:

84.1+,

for flow retarders and isolation valves which interrupt the fluid flow, usually upon the failure of some part of the system.

[List of Patents for class 303 subclass 9.64]

9.64

Motorcycle:

This subclass is indented under subclass 9.62. Subject matter wherein the fluid is distributed to the fluid pressure operated motors of a motorized land vehicle having a single from wheel and at least one rear wheel, e.g., a motorized velocipede.

SEE OR SEARCH CLASS:

188,	Brake, subclass 344 for velocipede brake structure.

9.65	Manual:
	This subclass is indented under subclass 9.62. Subject matter wherein the means for varying the fluid flow may be actuated by a human operator.

[List of Patents for class 303 subclass 9.66]

9.66

For pneumatic system:

This subclass is indented under subclass 9.62. Subject matter wherein the fluid being distributed is pressurized air.

(1) Note. The air pressure may be in the form of a vacuum.

(2) Note. The system may also include hydraulic portions.

[List of Patents for class 303 subclass 9.67]

9.67

Inertia:

This subclass is indented under subclass 9.62. Subject matter wherein the means for varying the fluid flow includes means responsive to a resistance to acceleration, i.e., to inertia.

SEE OR SEARCH THIS CLASS, SUBCLASS:

24.1,

for means for controlling fluid distribution by inertia in systems no to the apportioning type.

9.68	Inertia weight:
	This subclass is indented under subclass 9.67. Subject matter wherein significance is attributed to a moveable mass responsive to inertia for varying the fluid flow.

[List of Patents for class 303 subclass 9.69]

9.69

Load:

This subclass is indented under subclass 9.62. Subject matter wherein the means for varying the fluid flow includes means responsive to a gravity induced load on a supporting machine, e.g., a land vehicle.

SEE OR SEARCH THIS CLASS, SUBCLASS:

22.1+,

for means for controlling fluid distribution affected by a load but not of the apportioning type.

[List of Patents for class 303 subclass 9.71]

9.71

Having significant pressure control by front brake:

This subclass is indented under subclass 9.62. Subject matter wherein the means for varying the fluid flow is substantially affected by the amount of fluid pressure present in a fluid line connected to a fluid pressure operated, forward motor used for stopping a vehicle.

(1) Note. While many front/rear apportioning valves in tandem brake systems have a front pressure line connected thereto, significance with relation to affected apportioning valve operation must be claimed for a patent to be considered as an original classification in this subclass.

9.72	Having multiple pistons affecting fluid flow:
	This subclass is indented under subclass 9.62. Subject matter where in the mean for varying the fluid flow includes plural fluid propelling shafts to the fluid pressure operated motors.

9.73	Having significant output feature:
	This subclass is indented under subclass 9.62. Subject matter wherein the means for varying the fluid flow includes mean for importantly affecting the flow to a fluid pressure operated motor.

9.74	Multiple outlets:
	This subclass is indented under subclass 9.73. Subject matter having plural means for importantly affecting the flow.

[List of Patents for class 303 subclass 9.75]

9.75

Detail:

This subclass is indented under subclass 9.62. Subject matter wherein significance is attributed to a specific component of a fluid distribution system.

(1) Note. Included herein are control valve and system features relating to linkages, seals, springs and other parts of special importance.

[List of Patents for class 303 subclass 9.76]

9.76

Spring operated motor:

This subclass is indented under subclass 6.01. Subject matter wherein one of the motors includes a resilient component working in opposition to the fluid pressure of the motor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

71,	for fluid pressure retracting systems often used with spring operated motors.

SEE OR SEARCH CLASS:

188,	Brakes, particularly subclass 170 for spring applied, fluid pressure released brakes, per se.

[List of Patents for class 303 subclass 10]

WITH PUMP

The fluid-distribution system is combined with a pump for accumulating a supply for use of the system.

SEE OR SEARCH THIS CLASS, SUBCLASS:

116.1+,

for anti-lock brake system pump with a solenoid valve.

SEE OR SEARCH CLASS:

417,	Pumps, for pumps, per se.

[List of Patents for class 303 subclass 11]

Pressure control

The action of the pump is controlled by the pressure of the fluid pumped up.

SEE OR SEARCH CLASS:

417,	Pumps, subclasses 1+ for condition responsive control of a pump drive motor and 279+ for condition responsive pumped fluid control.

[List of Patents for class 303 subclass 12]

Vacuum

The system includes devices for creating a partial vacuum.

SEE OR SEARCH CLASS:

417,	Pumps, subclasses 151+ for jet pumps.

13	MULTIPLE CONTROL
	The distribution of the fluid is controlled by a plurality of means.

14	Double heading
	Devices in which, while there is a plurality of means for controlling the distribution of the fluid, when the system is in operation the control is assumed by one, the others being suppressed.

[List of Patents for class 303 subclass 15]

Fluid and electric

The distribution of the fluid is controlled by change of pressure in the control-pipe and by electric operation of the distributing-valves.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3,	for a fluid and electric distribution system.
121+,	for a speed controlled braking system that controls fluid braking pressure.

[List of Patents for class 303 subclass 16]

Automatic electric

The electric valves are operated to reduce the pressure in the control-pipe, and thus give an automatic operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

28,	for the use of the word "automatic"..

17	Electric impulse
	Upon the initiation of distribution at the first unit, a circuit is closed to continue the action electrically on other units. A current-generator may be operated upon the initial action to furnish current for the subsequent actions on other units.

[List of Patents for class 303 subclass 18]

EXTERIOR CONTROL

Control of system of distribution by appliances outside of and not forming part of the system.

SEE OR SEARCH CLASS:

246,	Railway Switches and Signals, particularly subclasses 167+ .

[List of Patents for class 303 subclass 19]

Deadman type

Distribution of the fluid is initiated upon some failure of the operator.

SEE OR SEARCH CLASS:

180,	Motor Vehicles, subclasses 272+ for a motor vehicle provided with safety-promoting means which is responsive to the incapacity or absence of its operator.

[List of Patents for class 303 subclass 20]

ELECTRIC CONTROL

The distribution is controlled electrically.

SEE OR SEARCH THIS CLASS, SUBCLASS:

121+,

for and electric speed control brake system.

[List of Patents for class 303 subclass 22.1]

22.1

LOAD CONTROL:

This subclass is indented under the class definition. Subject matter wherein int distribution of fluid to the brake motors of a machine, e.g., a vehicle, is regulated by means which responds to the weight of a gravity loading on the machine.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9.69,

for a load responsive type apportioning control.

22.2	Empty and load type:
	This subclass is indented under subclass 22.1. Subject matter wherein the regulating means responds in one manner of the machine does not have a gravity loading on it and in a different manner in the presence of a such a loading.

22.3	Alterable for different classes of service:
	This subclass is indented under subclass 22.2. Subject matter wherein the regulating means is capable of being changed so that it may be used for another type of application e.g., used on a passenger a high speed express, or a freight type vehicle.

[List of Patents for class 303 subclass 22.4]

22.4

Failure responsive:

This subclass is indented under subclass 22.1. Subject matter including a feature which functions when the distribution of fluid ceases to occur properly.

SEE OR SEARCH THIS CLASS, SUBCLASS:

84.1+,

for flow retarders and isolation valves which interrupt the fluid flow usually upon the failure of some part of the system.

SEE OR SEARCH CLASS:

188,	Brakes, subclasses 151+ for fluid pressure operated brakes often having safety devices.
200,	Electricity: Circuit Makers and Breakers, subclasses 82+ for a fluid pressure piston which is used as an operator to open of close a circuit and often used in an automobile.
340,	Communication: Electrical, subclasses 52+ for means automatically responsive to a condition of a vehicle, e.g., a brake fluid pressure monitor.

22.5	Responsive to fluid pressure spring:
	This subclass is indented under subclass 22.1. Subject matter wherein the regulating means is affected by fluid pressure generated by the action of hydraulic or pneumatic suspension means used to help support the gravity loading.

[List of Patents for class 303 subclass 22.6]

22.6

Railway vehicle:

This subclass is indented under subclass 22.1. Subject matter wherein the regulating means is intended for use on a rail guided and supported conveyance.

(1) Note. While the term "railway" or similar terminology may not always be claimed, a patent is considered to be proper hereunder as an original classification of its disclosure limits it to use in a railway vehicle.

[List of Patents for class 303 subclass 22.7]

22.7

Detail:

This subclass is indented under subclass 22.6. Subject matter wherein significance is attributed to a specific component of a fluid distribution system.

(1) Note. Included herein are control valve and system features relating to linkages, seals, springs, valve structure, adjustments and other parts of special importance.

[List of Patents for class 303 subclass 22.8]

22.8

Detail:

This subclass is indented under subclass 22.1. Subject matter wherein significance is attributed to a specific component of a fluid distribution system.

(1) Note. Included herein are control valve and system features relating to linkage, seals, springs, valve structure, adjustments and other parts of special importance.

[List of Patents for class 303 subclass 24.1]

24.1

INERTIA CONTROL:

This subclass is indented under the class definition. Subject matter wherein the distribution of fluid is regulated by meas which is responsive to a resistance to acceleration, i.e., inertia.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9.67+,

for means for controlling fluid distribution by inertia in apportioning type systems.

[List of Patents for class 303 subclass 25]

AUTOMATIC AND DIRECT

The fluid is fed to the motor through both an automatic and a direct operation.

(1) Note. The word "direct" is used in the sense that the fluid is fed from the control-pipe into the motor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

28,	for the use of the word "automatic"..

26	Supplementary control pipe
	The fluid is fed to the motor through an automatic and a direct operation, an additional control-pipe being used.

27	Direct on control-pipe reduction
	There is both an automatic and a direct operation, the direct operation taking place upon a reduction in control-pipe pressure.

28	AUTOMATIC
	Fluid from a local source is supplied to a motor by means of a valve operated in response to a change in pressure of the fluid in the control-pipe.

29	Supplementary control pipe
	Systems with supplementary control-pipe, the action being automatic with each pipe.

[List of Patents for class 303 subclass 30]

Supplementary reservoir pipe

Automatic systems with an additional pipe connected to pressure-supply on the different units.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5,	for cases of general application in which a motor and other receptacle are supplied.

[List of Patents for class 303 subclass 31]

Vacuum

Systems in which through a change of pressure in the control-pipe the motor is operated by pressure of atmosphere in opposition to a partial vacuum.

(1) Note. For cases in which vacuum operation is used in systems with pressure above atmospheric see this class, subclass 4.

(2) Note. See also this class, subclass 12 for systems including devices for producing a vacuum.

32	Equilibrium
	The piston of the motor is held inactive between two equal pressures, the action of the motor occurring upon the expansion of compressed fluid on one side when the fluid on the other side is permitted to escape.

[List of Patents for class 303 subclass 33]

Equalizing valves

A valve which in one position connects the control-pipe to the auxiliary reservoir and the motor to atmosphere and which upon reduction of pressure in the control-pipe connects the auxiliary reservoir to the motor.

(1) Note. The devices included in this subclass are what are known as "plain triple valves". Equalizing-valves having functions in addition to those just enumerated will be found under various headings implying the nature of these functions.

[List of Patents for class 303 subclass 34]

Rotary type

A valve in which a diaphragm moving upon the rise and fall of pressure in the control-pipe operates a rotary valve to perform the equalizing-valve functions, as set forth in the preceding subclass.

(1) Note. These valve structures may have functions in addition to those of the plain triple type, in which case the patents will be cross-referenced into the appropriate subclass.

35	Synchronizing
	Devices to effect a simultaneous application of fluid to the motors of a series similarly related to the control-pipe.

36	Release
	Devices to effect the simultaneous release of fluid from the motors in a series similarly related to the control-pipe.

[List of Patents for class 303 subclass 37]

Quick action

Devices designed to produce a simultaneous application of fluid to the motors of a series, the method being to secure a momentary exhaust of fluid from the control-pipe to the atmosphere through each equalizing-valve as the control-pipe pressure is lowered for an emergency operation.

(1) Note. Consult this class, subclass 82 for other devices for momentary exhaust of control-pipe fluid upon sudden lowering of pressure.

38	Service
	Devices designed to produce a simultaneous application of fluid to the motors of a series, the method being to secure a momentary exhaust of fluid from the control-pipe through the equalizing-valve as the control-pipe pressure is lowered for a service operation.

[List of Patents for class 303 subclass 39]

Control pipe to chamber

Upon lowering the pressure in the control-pipe the fluid exhausts into a closed chamber.

(1) Note. The chamber may be and usually is the motor-chamber. This chamber is usually at atmospheric pressure at the beginning of the operation.

[List of Patents for class 303 subclass 40]

Application valve

A valve having a diaphragm to be moved by increasing fluid-pressure to connect a source of pressure to a motor.

(1) Note. The fluid-pressure to move the diaphragm is usually supplied by the operation of an equalizing-valve.

SEE OR SEARCH CLASS:

137,	Fluid Handling, subclass 627.5 for system including closing and opening alternately seating floe controllers.

41	Preliminary valve movement
	Devices for counteracting the effects of unauthorized valve movements due to slight variations in control-pipe pressure.

42	Emergency preventers
	Devices for preventing an undesired emergency operation of an equalizing-valve after a series of slight reductions in control-pipe pressure.

43	Slow-reduction emergency
	Devices to assure production of emergency operation regardless of the extent of previous service operations.

44	Secondary service operation
	Devices operating to obtain additional pressure in the motor after equalization for an ordinary series of service operations.

45	Positive-movement equalizing valve
	Devices for moving the equalizing-valve main piston by means other than the usual unbalancing of pressures in control-pipe and local supply. The purpose is usually to move the piston to release position when stuck.

[List of Patents for class 303 subclass 46]

Augmented feed to motor

Provisions for further supply of fluid to the motor through the equalizing-valve to reinforce or supplement the auxiliary reservoir.

(1) Note. See this class, subclass 85 for examples of supplementary reservoirs for various purposes.

47	Train rear end first
	The motors in a train are charged beginning with the rear end.

[List of Patents for class 303 subclass 48]

DIRECT

Systems in which the motor is fed from the supply of fluid in the control-pipe upon an increase of pressure in the control-pipe.

SEE OR SEARCH CLASS:

188,	Brakes, subclass 151 for fluid- pressure-operated brakes, and 152+ and 154 for fluid-pressure brakes adapted to use on a motor-vehicle.

49	Liquid link
	Direct systems in which a liquid column is interposed between the impelling power and the motor.

50	MOTORMAN'S VALVES
	Valves operated directly by a the motorman adapted to connect the source of fluid-supply to the motor.

51	Conductor type
	Valves placed in the control-pipe and adapted to be operated by some one other than the motorman.

52	Multiple motors
	Motorman"s valves adapted to connect the fluid-supply to a plurality of motors, usually differently related to the distributing agency.

[List of Patents for class 303 subclass 53]

Engine and train

Motorman"s valves for controlling motors differently situated with respect to a plurality of train-sections.

SEE OR SEARCH THIS CLASS, SUBCLASS:

7,	for systems of this type.

[List of Patents for class 303 subclass 54]

Equalizing

Motorman"s valves adapted to cut off the flow when the outlet-pressure reaches a certain value.

SEE OR SEARCH THIS CLASS, SUBCLASS:

59,

55	Preliminary discharge
	Motorman"s valves in which a diaphragm is balanced by opposing pressures, the valve containing means for modifying the relation of the opposing pressures to permit the control-pipe pressure to reduce to any desired point.

56	Details
	Elementary parts.

57	Plurality of pressures
	Devices for rendering available for use fluid at more than one pressure.

58	Reuse
	The fluid after being used in one portion of the apparatus is conveyed into another portion before being permitted to exhaust into the atmosphere.

[List of Patents for class 303 subclass 59]