Class Definition for Class 474 - ENDLESS BELT POWER TRANSMISSION SYSTEMS OR COMPONENTS

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CLASS 474,	ENDLESS BELT POWER TRANSMISSION SYSTEMS OR COMPONENTS
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SECTION I - CLASS DEFINITION

GENERAL STATEMENT OF CLASS SUBJECT MATTER

A. This is the generic class for a power transmission system wherein a power input pulley* is in driving engagement with a belt* for advancing the belt along an endless path of travel and wherein a power output pulley is engaged with the belt at a position along such endless path to be driven by the belt and supply power for driving a load; or for a component part or auxiliary device intended for use in such system and not provided for elsewhere.

B. This is also the generic class for structure, per se, in the form of a pulley*, guide roll* or other belt*-contacting structure for driving, guiding, tensioning, or shifting the belt, or for such structure in combination with a nominally claimed belt.

(1) Note. A nominal recitation of a load device in combination with and driven by the power transmission system defined in the Class Definition, paragraph A of the General Statement of Class Subject Matter, above, will not exclude a patent from being placed in this class.

SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS

A method or apparatus for manufacturing a device of this class is not found herein, but is found in an appropriate manufacturing class. See References to Other Classes, below.

A belt*, per se, is found in numerous classes as will be exemplified in the search and line notes below. Unless a line note is specifically provided in the SEARCH CLASS notes below, a patent claiming a belt, per se, is properly classified in this or another class providing for such belt if the sole disclosure is for subject matter provided for in such class, or in Class 428 depending on the line established between such class and Class 428. If there is disclosure for multiple intended uses for the belt, one of which is for a power transmission system as defined in the above paragraph A of the General Statement of Class Subject Matter, then the patent is properly classified in this class (474) unless there is at least one claim specific to the intended use in another class, in which instance classification is in the other class.

Class 198, Class 226, and Class 254 provide specifically for a device, per se, in the nature of a pulley*, guide roll*, or other device for advancing, guiding, or directing a cable or web of flexible or articulated material, which may be endless, along an intended path of travel. In Class 198, the intended use of such device is in connection with an endless conveyor. In Class 226, the intended use of such device is in connection with feeding of material of indefinite length to a station where an operation is to be performed on the material. In Class 254, the intended use of such device is in connection with a cable for applying a pushing or pulling force to an object to be moved. In each of these classes, line notes should be inspected as to the line between themselves or between other classes. However, the line between these other classes (198, 226, and 254) and this class (474) is as follows: (a) if the sole disclosure of the device, per se, mentioned above is for intended use in a system provided for in the Class Definition, paragraph A of the General Statement of Class Subject Matter of this class (474) or if the disclosure is unclear as to intended use but it is apparent that the device may be used in said system, classification is in this class (474); (b) if the sole disclosure of the device, per se, mentioned above is for intended use in connection with the kind of device identified above with regard to one of the other classes (198, 226, or 254), then classification is in such other classes; (c) if there is disclosure of multiple intended uses for the device, one of which is appropriate for the system provided for in the Class Definition, paragraph A of the General Statement of Class Subject Matter of this class (474), then classification is in this class unless there is at least one claim specific to the intended use in one of the other classes (198, 226, or 254), in which instance classification is in the other class.

This class was formed from patents in Class 74, subclasses 216.5-258 (inclusive), and in Class 74, subclasses 611 and 722. Regarding class superiority as between this class (474) and Class 74, all subclasses appearing in the Class 74 schedule above subclass 640 are superior to the class. Furthermore, a combination of a device of this subclass with a Class 74 device as may be found in Class 74, subclasses 650, 655, 661, 664, 670, 718, 720, 721, 745+, or 190-216.3 (inclusive) is considered superior to this class. This class is superior to all other subclasses in Class 74 indented under subclass 640 and to all other subclasses coordinate with Class 74, subclass 640, but lower in the Class 74 schedule than subclass 640.

Caveat. Other than the patents involved in the formation of this class as identified in above, no other subclasses in Class 74 or any other class were screened; and so, when appropriate other search areas in Class 74 and in the classes indentified in the Search Notes below should be given consideration.

SECTION III - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

15,	Brushing, Scrubbing, and General Cleaning, particularly subclasses 256.5+ for a cleaning device mounted to act on a moving surface, and see (1) Note following the definition of subclass 92 of this class (474) for a statement of the line.
16,	Miscellaneous Hardware (e.g., Bushing, Carpet Fastener, Caster, Door Closer, Panel Hanger, Attachable or Adjunct Handle, Hinge, Window Sash Balance, etc.), particularly subclasses 210+ for sash cord guide.
19,	Textiles: Fiber Preparation, particularly subclasses 244+ for a fiber drafting apron in the form of an endless band; and subclasses 240+ for a variable speed device operating in connection with a fiber drafting roll.
24,	Buckles, Buttons, Clasps, etc., particularly subclasses 31+ for a device for connecting opposite ends of a band to form a belt*. A connector, per se, is in Class 24, but a connector claimed in combination with belt structure is in this class (474).
29,	Metal Working, particularly subclasses 892+ for a method of making a pulley* or guide roll* (See Lines With Other Classes and Within This Class, above.).
30,	Cutlery, particularly subclasses 380 and 381+ for a hand-manipulable cutting implement in the form of an endless band or chain.
57,	Textiles: Spinning, Twisting, and Twining, particularly subclass 21 for an aparatus for forming an endless band by a twisting or twining operation; subclasses 104+ for a belt* power transmission for driving a spinning, twisting, or twining mechanism; and subclass 201 for an endless band formed by a spinning, twisting, or twining operation.
59,	Chain, Staple, and Horseshoe Making, for a method or apparatus for manufacturing a device found in Class 474. (See Lines With Other Classes and Within This Class, above.)
59,	Chain, Staple, and Horseshoe Making, particularly subclasses 1+ for a method or apparatus for making a chain; and subclasses 78+ for a general purpose or ornamental chain.
72,	Metal Deforming, subclass 409.15 for apparatus to apply a deformable metal belt clip.
74,	Machine Element or Mechanism, appropriate subclasses for other power transmission systems and components, and see Lines With Other Classes, and Within This Class, above.
83,	Cutting, particularly subclasses 788+ for cutting device in the form of an endless band or chain. Regarding Class 83 or any other cutting class, a patent claiming a belt*, per se, for carrying a cutting element is classified in this class (474) unless there is a claim reciting a cutting element, such as a cutting tip or blade which is to perform a cutting function.
104,	Railways, subclasses 172.1+ and 173.1+ for chain or cable car propelling means.
105,	Railway Rolling Stock, particularly subclasses 101+ for a rolling stock wheel or axle drive system in the form of a belt* and pulley* drive; and subclasses 105+ for a belt tightener for such a drive system.
106,	Compositions: Coating or Plastic, particularly subclass 36 for a coating or plastic composition used to enhance friction grip such as on a pulley*.
156,	Adhesive Bonding and Miscellaneous Chemical Manufacture, particularly subclasses 137+ for a method of making a belt*, and see Lines With Other Classes and Within This Class, above.
162,	Paper Making and Fiber Liberation, particularly subclasses 348+ for an endless band forming mold used in producing liquid laid fibrous products; subclass 257 for automatic control of transverse movement of such a forming mold; and subclass 273 for means to maintain a desired degree of tension in an endless forming surface.
180,	Motor Vehicles, particularly subclasses 230 , 231, 239, 241, 251, 350+, 357, 366, and 373 for a motor vehicle including an endless band for transmitting drive to the wheels.
184,	Lubrication, appropriate subclasses for lubrication systems in general, and particularly subclasses 15.1+ for a chain or cable lubricator. If the structure of a belt, pulley or guide roll* is modified for the purpose of facilitating admission of lubricant, classification is in Class 474, but lubrication devices and systems are in Class 184.
185,	Motors: Spring, Weight, or Animal Powered, particularly subclass 16 for a belt* intended to be driven by an animal treading on the belt.
187,	Elevator, Industrial Lift Truck, or Stationary Lift for Vehicle, subclasses 251+ for means for raising or lowering an elevator car which includes a car supporting cable.
191,	Electricity: Transmission to Vehicles, particularly subclasses 63+ for a trolley head mounted for rolling contact with an electric conductor.
198,	Conveyors: Power-Driven, particularly subclasses 804+ for an endless conveyor, and see the line notes in Lines With Other Classes and Within This Class, above. See also a listing of the other classes having structure pertinent to an endless conveyor following the definition of subclass 804 in Class 198, and a listing of classes pertinent to belt* tighteners following the definition of subclass 813 in Class 198.
211,	Supports: Racks, particularly subclasses 119.02+ for an endless cable clothesline with supporting and tightening structure.
226,	Advancing Material of Indeterminate Length, appropriate subclasses for structure for driving or guiding material of indeterminate length, and see the line note in Lines With Other Classes and Within This Class, above.
242,	Winding and Reeling, appropriate subclasses for a reel, spool, guide, or tensioning device used in connection with winding of flexible material.
248,	Supports, particularly subclasses 646+ for a support for a movable machine wherein adjustability may provide a belt*-tensioning feature.
254,	Implements or Apparatus for Applying Pushing or Pulling Force, appropriate subclasses for a drum or guide intended to be used in connection with a cable for applying a pulling or pushing force to an object to be moved, and see the lines notes in Lines With Other Classes and Within This Class, above.
280,	Land Vehicles, particularly subclass 250 and 261 for a land vehicle having a belt or chain power transmission.
305,	Wheel Substitutes for Land Vehicles, appropriate subclasses for an endless track intended for use as a wheel substitute on a land vehicle.
318,	Electricity: Motive Power Systems, for electric motor control, and particularly subclasses 6+ for control of tension in material being driven; subclass 10 for control of forward or reverse of a device being driven; subclass 11 for control for variable speed of a device being driven; and subclass 15 for electric motor driven gearing including belt and pulley drive systems.
322,	Electricity: Single Generator Systems, subclass 42 for control for a belt drive in such a system; and subclass 43 for control of belt slip.
384,	Bearings, appropriate subclasses for bearings, per se, which may be used with a pully* or guide roll*.
399,	Electrophotography, subclasses 162+ for photoconductive belt members and subclasses 297+ for transfer, particularly subclass 313 for roller or belt electrostatic transfer.
403,	Joints and Connections, appropriate subclasses for connections, per se, and particularly subclasses 230+ for a connection between the side of a member and a rod extending transverse thereto.
428,	Stock Material or Miscellaneous Articles, appropriate subclasses for stock material, and see the reference to Class 474 in the Class Definition of Class 428.
433,	Dentistry, subclasses 105 and 110+ for dental apparatus including an endless belt transmission.
451,	Abrading, subclasses 296+ for an abrading tool comprising an endless band; and subclass 311 for a tightener for an abrading band.
464,	Rotary Shafts, Gudgeons, Housings, and Flexible Couplings for Rotary Shafts, particularly subclasses 51+ for a flexible connection between a shaft and a driven member.
475,	Planetary Gear Transmission Systems or Components, for planetary gear transmissions combined with a device of Class 474.
477,	Interrelated Power Delivery Controls, Including Engine Control, especially subclasses 44+ for interrelated engine and belt-type transmission control.
492,	Roll or Roller, for a roll, per se, not elsewhere provided for, and see the search notes thereunder.

SECTION IV - GLOSSARY

The following Glossary will define certain terms used in the class and subclass definitions of this class so as to facilitate understanding and simplify such definitions.

BELT

A power transferring member forming an endless loop and constructed of flexible material or of articulated rigid links to permit the member to conform to a radius of curvature of a pulley* drive face and intended, in use, to be driven in an endless path; and, by contact with the pulley drive face, to transmit power to or extract power from the pulley.

PULLEY

A device rotatable about an axis and having a drive face radially spaced from the axis of rotation for intended power transferring engagement with a belt* to drive the belt on its endless path or to extract power from the belt to drive an output load device.

GUIDE ROLL

A device rotatable about an axis and having a belt*-contacting face radially spaced from the axis of rotation for intended engagement with the belt to aid in directing the belt along an intended path of travel. A guide roll, as distinguished from a pulley*, is not intended to provide driving power to, or extract power from, a belt.

SUBCLASSES

[List of Patents for class 474 subclass 1]

CONTROL FOR FORWARD AND REVERSE:

This subclass is indented under the class definition. Subject matter wherein mechanism is provided for changing the direction of rotation of an output load driving member from clockwise to counterclockwise or vice versa.

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SEE OR SEARCH CLASS:

74,	Machine Element or Mechanism, subclasses 37 and 89.2+ for mechanical movements for motion conversion using belt and pulley drive means, and appropriate subclass under 640+ for other gearing and gearing combination having reversing means.
318,	Electricity: Motive Power Systems, subclass 10 for control of forward and reverse in a device being driven.
475,	Planetary Gear Transmission Systems or Components, appropriate subclasses, for planetary gearing systems having reversing means.

[List of Patents for class 474 subclass 2]

Cyclical or sequential (e.g., machine controlled, etc.):

This subclass is indented under subclass 1. Subject matter wherein the mechanism functions to periodically change the direction of rotation of the load driving member according to a predetermined program without operator intervention.

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71,	for cyclical or sequential operation in a variable speed arrangement.

[List of Patents for class 474 subclass 3]

Including device for shifting belt laterally of its direction of run:

This subclass is indented under subclass 2. Subject matter wherein the mechanism includes a member for moving a belt* in either of opposite directions parallel to the longitudinal extent of the rotational axis of a pulley*.

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6,	80+, 83, 102+, and 122+, for other structure involving lateral shift of a belt such as for reversing the direction of rotation of a load driving member, for causing a change in speed ratio, for removing a belt from a pulley, or for correcting belt training deviation.

[List of Patents for class 474 subclass 4]

Including separate belts for forward and reverse:

This subclass is indented under subclass 1. Subject matter wherein separate belts* are selectively engageable in power transmitting relationship between a power input member and the power output load driving member, one of the belts being engaged when it is desired to drive the load driving member clockwise, and the other of the belts being engaged when it is desired to drive the load driving member counterclockwise.

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73+,	for a variable speed drive arrangement using plural belts.
84+,	for a belt and pulley drive including a plurality of separate belts.

[List of Patents for class 474 subclass 5]

Belt selection by shifting or tightening belt:

This subclass is indented under subclass 4. Subject matter wherein selective engagement or disengagement of a belt* is accomplished by moving the belt into or from power transmitting engagement with a pulley*.

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75,	for a device for tightening a belt on a pulley associated with a variable speed drive.
101+,	for a device for adjusting belt tension.

[List of Patents for class 474 subclass 6]

Including device for shifting belt laterally of its direction of run:

This subclass is indented under subclass 5. Subject matter wherein the mechanism includes a member for moving a belt* in either of opposite directions parallel to the longitudinal extent of the rotational axis of a pulley*.

Image 1 for class 474 subclass 6

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3,	80+, 83, 102+, and 122+, for other structure involving lateral shift of a belt such as for reversing the direction of rotation of a load driving member, for causing change in speed ratio, for removing a belt from a pulley, or for correcting belt training deviation.

7	Including coaxial pulleys rotated in opposite directions by single endless belt simultaneously engaging both pulleys:
	This subclass is indented under subclass 1. Subject matter including two pulleys* mounted for rotation about a common axis and wherein a single endless belt* is in driving engagement with both pulleys, the belt being so arranged relative to the pulleys that movement of the belt along its path of travel concurrently drives one pulley in a clockwise direction and the other pulley in a counterclockwise direction.

8	PULLEY WITH BELT-RECEIVING GROOVE FORMED BY DRIVE FACES ON RELATIVELY AXIALLY MOVABLE COAXIAL CONFRONTING MEMBERS (E.G., EXPANSIBLE CONE PULLEY, ETC.):
	This subclass is indented under the class definition. Subject matter wherein a pulley* includes a pair of separate components having belt*-engaging surfaces facing each other for receiving a belt in the space between such surfaces, the components being mounted for relative adjustment toward and away from each other in directions generally parallel to the longitudinal extent of the axis of rotation of the pulley to increase or decrease the extent of gripping force exerted by the surfaces on the belt or to increase or decrease the effective diameter of the pulley.

9	Members are gripping jaws actuated during each rotation of pulley:
	This subclass is indented under subclass 8. Subject matter wherein during each full revolution of the pulley* there is a first period of time when opposed belt*-engaging surfaces are in driving engagement with the belt, and a second period of time when opposed belt-engaging surfaces are out of driving engagement with the belt, and wherein the components are mounted for relative cyclical movement accomplished by interaction with the belt or by an auxiliary device, whereby during the second period of time the belt-engaging surfaces are separated to facilitate exit and entrance of the belt from and to the space between the surfaces, and whereby the belt engaging surfaces have relative movement to a position toward each other during the first period of time to increase the engagement force of the surfaces with the belt.

10	Via relatively rotating cam and follower:
	This subclass is indented under subclass 9. zSubject matter including relatively rotating elements having actuating surfaces in rolling or sliding engagement with each other, said actuating surfaces being so contoured with respect to each other, and so associated with respect to one of said belt*-engaging components that relative rotation between such actuating surfaces is converted into said relative cyclical movement of said one of said belt-engaging components.

[List of Patents for class 474 subclass 11]

Speed responsive:

This subclass is indented under subclass 8. Subject matter including means for sensing velocity or change of velocity of a load device or of a member operating in a drive train to drive the load device; and, responsive to such sensed velocity or change of velocity, said means acts to alter the relative axial position of said components.

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50,	and 70, for other arrangements using a speed responsive actuator in a belt and pulley drive system.

[List of Patents for class 474 subclass 12]

And load responsive:

This subclass is indented under subclass 11. Subject matter further including means for sensing resistance to movement or change in resistance to movement of a load device or of a member in a drive train to drive the load device; and, in response to such sensed resistance or change of resistance to movement, said means acts to alter the relative axial position of said components.

Image 1 for class 474 subclass 12

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17+,	50, 70, and 109, for other arrangements using a load responsive actuator in a belt and pulley drive system.

13	To centrifugal force:
	This subclass is indented under subclass 11. Subject matter wherein the means for sensing the velocity or change of velocity is mounted for rotation with a rotatable member and includes a material or part movable outwardly by inertial force from the axis of rotation of the rotatable member.

14	Via pivoted weight:
	This subclass is indented under subclass 13. Subject matter wherein the part movable outwardly by inertial force comprises a device pivotal about a fixed axis.

15	Via ball:
	This subclass is indented under subclass 13. Subject matter wherein the part movable outwardly by inertial force comprises one or more spherically shaped devices.

16	Via liquid:
	This subclass is indented under subclass 13. Subject matter wherein the material movable outwardly by inertial force is a liquid.

[List of Patents for class 474 subclass 17]

Load responsive:

This subclass is indented under subclass 8. Subject matter including means for sensing resistance to movement or change in resistance to movement of a load device or of a member in a drive train to drive the load device; and, in response to such sensed resistance or change of resistance to movement, said means acts to alter the relative axial position of said components.

Image 1 for class 474 subclass 17

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12,	for a combined speed and load responsive device for altering the relative axial position of coaxial confronting drive faces.
50,	70, and 109, for other arrangements using a load responsive actuator in a belt and pulley drive system.

[List of Patents for class 474 subclass 18]

With actuator driven by electrical or fluid motor:

This subclass is indented under subclass 17. Subject matter wherein the means for altering the relative axial position of the components is accomplished with the help of force derived from or transmitted via electrical energy or the exertion of force upon a fluid.

Image 1 for class 474 subclass 18

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28,	51, 103+, and 110, for other arrangements using an electrical or fluid motor as a drive for an actuator in a belt and pulley drive system.

19	Via relatively rotating cam and follower:
	This subclass is indented under subclass 17. Subject matter wherein the means responsive to the sensed resistance or change of resistance to movement includes relatively rotating elements having actuating surfaces in rolling or sliding engagement with each other, said actuating surfaces being so contoured with respect to each other, and so associated with respect to one of said belt*-engaging components that relative rotation between such actuating surfaces is converted into axial movement of one of said belt-engaging components.

20	Including interengaged threads:
	This subclass is indented under subclass 19. Subject matter wherein each of the relatively rotating elements is generally cylindrical in cross sectional configuration, a cylindrical wall of one of the elements having an external helical ridge forming an actuating surface, and a cylindrical wall of the other of the elements having an internal helical ridge forming a cooperating actuating surface; the two cylindrical elements being coaxially mounted with the external ridge of one interengaged with the internal ridge of the other so that relative rotation of the elements also causes relative axial movement of the elements and axial movement of a component associated with the axially moved element.

21	Including plural separate cam and follower pairs for adjusting plural members:
	This subclass is indented under subclass 19. Subject matter including an additional pair of relatively rotating elements having actuating surfaces in rolling or sliding engagement with each other, the additional pair of actuating surfaces being so contoured with respect to each other, and so associated with respect to an additional belt*-engaging component that relative rotation between such additional pair of actuating surfaces is converted into axial movement of the additional belt-engaging component.

22	Temperature responsive:
	This subclass is indented under subclass 8. Subject matter including means to sense a condition or change of condition as regards heat or coldness of a member operating in a pulley* drive train or in the environment surrounding the drive train; and, in response to such sensed condition, or change of condition, said means acts to alter the relative axial position of said components.

[List of Patents for class 474 subclass 23]

Adjusted by power from pulley drive train:

This subclass is indented under subclass 8. Subject matter wherein an auxiliary device is constantly rotated during rotation of the pulley* by the same source which causes rotation of the pulley, and such device supplies the force for relative adjustment of the pulley components.

(1) Note. The auxiliary device may be separated from the pulley or may be a component integrally connected to, or forming a part of, the pulley.

(2) Note. For a patent to be placed herein a human operator may selectively initiate the adjustment such as by selective clutch engagment, but the auxiliary device provides the sole actuating force. If a human operator provides the actuating force, even though such force may be multiplied as through levers, screws, etc., the patent is placed in subclasses below such as 29+ or 37+.

Image 1 for class 474 subclass 23

24	And member has plural, relatively axially movable drive faces:
	This subclass is indented under subclass 8. Subject matter wherein at least one of the components is formed of a plurality of elements each having a belt-engaging surface, the elements of each component being adjustable with respect to each other in directions generally parallel to the longitudinal extent of the pulley* axis.

25	And pulley shiftable laterally of its axis of rotation:
	This subclass is indented under subclass 8. Subject matter wherein a pulley* is mounted for movement in a direction perpendicular to the longitudinal extent of the pulley axis of rotation, the pulley which is so mounted either being the pulley having adjustable components or another pulley in the drive train.

[List of Patents for class 474 subclass 26]

Mounted on laterally shiftable motor:

This subclass is indented under subclass 25. Subject matter wherein the pulley* is mounted on the shaft of a device which supplies the primary source of power for driving the pulley, said device with its shaft and pulley being movable in a direction perpendicular to the longitudinal extent of this shaft axis.

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114+,

for an adjustable mounted motor which is movable such as for affecting the extent of drive traction between the belt and pulley.

[List of Patents for class 474 subclass 27]

Mounted on laterally shiftable countershaft:

This subclass is indented under subclass 25. Subject matter wherein first and second belts* in a drive train are arranged in series driving relationship via an intermediate shaft carrying first and second pulleys*, and wherein said intermediate shaft is mounted for movement in a direction perpendicular to the longitudinal extent of the axis of the intermediate shaft.

Image 1 for class 474 subclass 27

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89,	for a device having plural belts in series driving relationship interconnected via a laterally shiftable countershaft.

[List of Patents for class 474 subclass 28]

Fluid pressure actuator for adjustment of member:

This subclass is indented under subclass 8. Subject matter wherein the relative adjustment of said belt*-engaging components is accomplished by energy derived from or transmitted via the exertion of force upon a fluid.

Image 1 for class 474 subclass 28

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18,	51, 103+, and 110, for other arrangements using an electrical or fluid motor as a drive for an actuator in a belt and pulley drive system.

[List of Patents for class 474 subclass 29]

Including actuator interconnecting plural pulleys on spaced shafts for simultaneous adjustment:

This subclass is indented under subclass 8. Subject matter wherein each of a pair of spaced shafts carries a pulley* having adjustable belt*-engaging components and wherein a common motion-inducing member is interlinked with each pulley to provide concurrent axial adjustment of at least one of the adjustable components on each of the pulleys.

Image 1 for class 474 subclass 29

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52+,	for mechanism for simultaneously adjusting plural pulleys of the kind provided for in subclasses 47+.

30	For axial adjustment of each member on each pulley:
	This subclass is indented under subclass 29. Subject matter wherein the motion-inducing member is interlinked with the pulleys* to provide concurrent axial adjustment of each of the pair of belt*-engaging components on each of the pulleys.

31	By dual lever mechanism:
	This subclass is indented under subclass 30. Subject matter wherein the motion-inducing member includes a pair of arms each mounted for pivotal movement about its own axis; and wherein one of the arms is connected to one of the movable belt-engaging components on each of the spaced pulleys, and the other arm is connected to the other of the belt-engaging components on each of the spaced pulleys, so that simultaneous pivoting of the arms causes concurrent adjustment of each pair of belt-engaging components on each pulley.

32	Plural members forming plural belt-receiving grooves on common axis:
	This subclass is indented under subclass 8. Subject matter including at least three coaxial components having belt*engaging surfaces arranged at intervals to define at least two circumferentially extending belt-receiving spaces between such surfaces along the axis of rotation of the components.

33	With member common to plural grooves:
	This subclass is indented under subclass 32. Subject matter wherein at least one of the components has belt*-engaging surfaces on each of opposite sides thereof so as to form a wall for two adjacent belt-receiving spaces.

34	Plural members common to plural grooves:
	This subclass is indented under subclass 33. Subject matter wherein at least two of the components each have belt*-engaging surfaces on each of opposite sides thereof.

35	Axially spaced members simultaneously adjustable:
	This subclass is indented under subclass 32. Subject matter wherein at least two of the components are mounted for concurrent movement in a direction parallel to the longitudinal extent of the axis of rotation.

36	On bolt radially spaced from pulley axis:
	This subclass is indented under subclass 35. Subject matter wherein means interconnecting said components includes one or more rodlike members extending in a direction generally parallel to the longitudinal extent of the axis of rotation and spaced radially from a shaft upon which the components are mounted.

37	By manual actuator for one or both confronting members:
	This subclass is indented under subclass 8. Subject matter having manually operated motion-inducing means for causing relative adjustment of said components toward and away from each other.

38	With neutral condition of drive:
	This subclass is indented under subclass 37. Subject matter wherein said components are adjustable to a position where neither of the facing belt*-engaging surfaces are engaged with the belt, and wherein structure is provided separate from said components to facilitate supporting the belt to allow relative motion between the belt and the components.

39	Screw actuated:
	This subclass is indented under subclass 37. Subject matter wherein the motion-inducing means comprises two relatively rotatable members having interengaged helical threads, one of such members being fixed and the other rectilinearly movable in a direction parallel to the axis of rotation so that relative rotation between the members causes such rectilinear movement, and one of said members forming a part of or being interconnected to one of said adjustable components so that said rectilineal movement causes said relative adjustment of said components.

40	With additional linkage in actuator drive train:
	This subclass is indented under subclass 39. Subject matter wherein rectilineal motion is transmitted from said rectilinearly movable member to said axially adjustable component via a pivotally mounted lever.

41	By opposite-handed screw threads engaging adjacent members:
	This subclass is indented under subclass 39. Subject matter wherein each of the relatively axially adjustable components includes helical threads cooperating with helical threads of the relatively rotatable member, the helical threads being so arranged that relative rotation between the threaded members causes both components to move simultaneously axially toward each other or both to move simultaneously axially away from each other depending on the direction of rotation.

42	With means to positively lock members in adjusted position:
	This subclass is indented under subclass 39. Subject matter including an auxiliary device actuatable between hold and release positions for preventing relative rotation between said relatively movable motion-inducing members when said device is actuated to a hold position and for permitting relative rotation between said relatively movable motion-inducing members when said device is in a release position.

[List of Patents for class 474 subclass 43]

Including lubrication or particular guide or bearing for movable member:

This subclass is indented under subclass 8. Subject matter wherein (1) structure is provided to facilitate lubrication of a surface of the movable component, or (23) wherein a separate device is mounted between the movable component and its support, (a) said separate device serving to guide movement of the movable component along a predetermined axial path relative to its support, or (b) said device comprises bearing structure facilitating relative movement between the movable component and its support.

Image 1 for class 474 subclass 43

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184,	Lubrication, appropriate subclasses for lubrication in general; and see the reference to Class 184 under "SEARCH CLASS" in the class definition of Class 474 for a statement of the line between classes.
384,	Bearings, appropriate subclasses for bearings, per se.

44	Self-lubricated bearing:
	This subclass is indented under subclass 43. Subject matter wherein said device comprises a self-sustaining sleeve which inherently has a low coefficient of friction, or which has been impregnated with a lubricant.

[List of Patents for class 474 subclass 45]

With lubrication of support for movable member:

This subclass is indented under subclass 43. Subject matter wherein the structure is to facilitate injection of lubricant from an auxiliary source to a surface of the movable component.

Image 1 for class 474 subclass 45

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