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 [Search a list of Patent Appplications for class 301]   CLASS 301,LAND VEHICLES: WHEELS AND AXLES
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SECTION I - CLASS DEFINITION

This class includes the elementary structure of a running-gear for a land vehicle, that is, commonly known as a "wheel" or an "axle", per se. The combination of a "significant" wheel or axle with "nominal" other structure, i.e., wherein the wheel or axle comprises the dominant feature or essential part, is also found in this class.

SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS

(1) This class is subordinate to Class 280, Land Vehicles, and distinguishes therefrom by the above definition.

(2) This class is subordinate to Class 180, Motor Vehicles. The broader or more comprehensive combinations of cooperating structure of a wheel and axle with other elements of a motor-vehicle are classified in Class 180. Such cooperating structure on the wheel and axle is found in this class (301) only where its modification is for wheel and axle structure purposes alone.

(3) The combination of a detailed wheel with a detailed brake is found in Class 301. A brake with only enough wheel structure to support the brake is found in Class 188, Brakes.

(4) A wheel or the combination of a wheel with a resilient tire or with a resilient wheel component is normally found in Class 301. A resilient tire, a resilient wheel, or a resilient wheel component is found in Class 152. For example, a resilient tire with a rim including details of the rim allowing the tire to be seated thereon is found in Class 152, but it is found in Class 301 if further including mounting structure for supporting that structure on a bearing hub. A traction-increasing device supported by a wheel, even though combined with a resilient tire, is found in Class 301, but another traction-increasing device operative to engage the tread of the tire and permit resilient operation thereof is found in Class 152.

(5) A device which functions as a transportation means for a vehicle, but which is not a true wheel, is found in Class 180, Motor Vehicles, subclasses 7.1+; and Class 305, Wheel Substitutes for Land Vehicles.

SECTION III - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

29Metal Working,   subclasses 894.3+ for a process of making (including assembling) a wheel or wheel part.
74Machine Element or Mechanism,   for a casing for an axle; or for an axle (especially a motor vehicle axle) which involves improvement in the gear casing or in the gearing. An axle housing, per se (which may be recited as an "axle") is found in Class 301.
152Resilient Tires and Wheels (see Lines With Other Classes,   4, above).
180Motor Vehicles (see Note 2 and Lines With Other Classes and With This Class,   above).
280Land Vehicles, for a vehicle riding on a runner(s) or for a runner, per se. (see Lines With Other Classes,   (1) above.)
305Wheel Substitutes for Land Vehicles,   subclass 7 for a rigid circular track provided with a wheel or roller within the track the axis of which is eccentrically positioned with relation to the axis of the track, said wheel or roller being adapted to roll on a lower portion of the track, and subclasses 124+ for wheels especially modified to be used in flexible track apparatus for land vehicles. For a patent claiming a wheel, per se, to be placed in Class 305 the wheel as disclosed must include structure which coacts with a track part, such as a flanged rim, or a grooved rim which structure is adapted to interengage with a portion of a flexible track. A wheel which does not incorporate such structure, even though disclosed as being a flexible track-supporting wheel, is classified in this class (301).
384Bearings,   for a vehicle wheel bearing.
474Endless Belt Power Transmission Systems or Components,   particularly subclasses 166+ for a friction drive pulley or guide roll.

SUBCLASSES

[List of Patents for class 301 subclass 1]    1COMBINED WHEEL AND AXLE MODIFICATION
 This subclass is indented under the class definition.  Combination involving combined modification of both wheel and axle or modification of one which affects the operation of the other.
  
[List of Patents for class 301 subclass 2]    2Cushion lateral thrust
 This subclass is indented under subclass 1.  Combination having spring element to cushion relative lateral movement of the wheel.
  
[List of Patents for class 301 subclass 2.5]    2.5With pedal crank
 This subclass is indented under subclass 1.  Combination of wheel, axle and driving pedal crank, used chiefly in bicycle propulsion.

SEE OR SEARCH CLASS:

74Machine Element or Mechanism,   subclasses 594.1+ for a journal bearing with a crank and pedal.
384Bearings,   subclass 431 for a plain bearing and subclass 458 for an antifriction bearing for a pedal type crank.
  
[List of Patents for class 301 subclass 5.1]    5.1WHEEL:
 This subclass is indented under the class definition.  Structure comprising that part of a running-gear commonly known as a wheel, i.e., a member having a round periphery, adapted to turn about its center and to supportingly carry a vehicle over the land (1) by rolling engagement of the periphery with the land or (2) by rolling engagement of a tire on the periphery with the land.

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16Miscellaneous Hardware (e.g., Bushing, Carpet Fastener, Caster, Door Closer, Panel Hanger, Attachable or Adjunct Handle, Hinge, Window Sash Balance, etc.),   subclasses 18+ for a caster including a wheel.
249Static Molds,   subclass 56 for mold for forming a vehicle wheel.
428Stock Material or Miscellaneous Articles,   subclass 579 for a metallic blank or circular shape and of width greater than its thickness.
  
[List of Patents for class 301 subclass 5.21]    5.21Balancing device:
 This subclass is indented under subclass 5.1.  Wheel comprising (1) a wheel having provision to equalize the weight of one portion thereof with respect to another, or (2) a member particularly adapted to be used on a wheel to equalize the weight of one portion of the wheel with respect to another.

SEE OR SEARCH THIS CLASS, SUBCLASS:

53.5,for a weight added to a wheel to increase the traction thereof.

SEE OR SEARCH CLASS:

152Resilient Tires and Wheels,   subclass 154.1 for a resilient tire having provision to balance the tire (compared to means to balance the wheel or wheel and tire assembly found in this subclass.)
  
[List of Patents for class 301 subclass 5.22]    5.22Self-operating:
 This subclass is indented under subclass 5.21.  Wheel wherein the balancing device includes provision to allow a portion thereof to relocate to effect weight equalization without outside impetus.
  
[List of Patents for class 301 subclass 5.23]    5.23With peripheral roller:
 This subclass is indented under subclass 5.1.  Wheel combined with at least one additional member which is also adapted to function as a wheel, which additional member turns about a second axis, which second axis orbits about the first axis, i.e., the axis of the "primary" wheel.
  
[List of Patents for class 301 subclass 5.24]    5.24Having housing for tire inflation means:
 This subclass is indented under subclass 5.1.  Wheel including structure for protecting a member intended to transmit a filling fluid to a hollow tire thereon.

SEE OR SEARCH CLASS:

152Resilient Tires and Wheels,   subclasses 450+ for an inflatable pneumatic tire or tire combined with a wheel, including a tire inflation means; and subclasses 427+ for an inflating means combined with a wheel.
  
[List of Patents for class 301 subclass 5.301]    5.301Skate wheels:
 This subclass is indented under subclass 5.1.  Subject matter wherein the wheel is particularly adapted to use on a roller skate.
(1) Note. A roller skate wheel combined with a bearing is included in this subclass.
(2) Note. Wheels under this subclass include a wheel structure and any tire joined thereto.

SEE OR SEARCH CLASS:

16Miscellaneous Hardware (e.g., Bushing, Carpet Fastener, Caster, Door Closer, Panel Hanger, Attachable or Adjunct Handle, Hinge, Window Sash Balance, etc.),   subclass 45 for a wheel particularly adapted to use on a caster.
152Resilient Tires and Wheels,   for a tire or wheel under that class definition which might be used on a roller skate.
280Land Vehicles,   subclass 11.19 for wheeled skates.
362Illumination,   subclass 500 for an illuminated wheel structure.
384Bearings,   for a skate bearing, per se.
  
[List of Patents for class 301 subclass 5.302]    5.302Traction increasing:
 This subclass is indented under subclass 5.301.  Subject matter including provision for increasing the tractive effort thereof or for preventing slipping (or sluing) of the wheel from its intended direction of travel.
  
[List of Patents for class 301 subclass 5.303]    5.303Shape:
 This subclass is indented under subclass 5.302.  Subject matter wherein the significance is attributed to the configuration of a traction surface of the wheel.
  
[List of Patents for class 301 subclass 5.304]    5.304Cushion:
 This subclass is indented under subclass 5.301.  Subject matter wherein a part of the wheel is formed of an elastic or softer material to effectively prevent transmission of vibrations to a skate user.
  
[List of Patents for class 301 subclass 5.305]    5.305Mounting on axle or skate:
 This subclass is indented under subclass 5.301.  Subject matter includes a specific structure for rotatably securing the wheel to an axle or skate.
  
[List of Patents for class 301 subclass 5.306]    5.306Hub having tire retention means:
 This subclass is indented under subclass 5.301.  Subject matter wherein a central portion of the wheel includes a formation or a member which is adapted to engage and retain the tire.

SEE OR SEARCH CLASS:

152Resilient Tires and Wheels,   subclass 323 for specific tire structure and subclasses 393 for tire reinforcing structure.
  
[List of Patents for class 301 subclass 5.307]    5.307Tire molded to hub:
 This subclass is indented under subclass 5.306.  Subject matter wherein the tire is permanently joined as an integral part of the central portion of the wheel.
  
[List of Patents for class 301 subclass 5.308]    5.308Plural diverse materials:
 This subclass is indented under subclass 5.301.  Subject matter wherein the wheel is made of more than one material.

SEE OR SEARCH CLASS:

152Resilient Tires and Wheels,   subclass 323 for tire cushion structure and subclasses 393 for tire reinforcing structure.
  
[List of Patents for class 301 subclass 5.309]    5.309Hub construction:
 This subclass is indented under subclass 5.301.  Subject matter includes a structural arrangement of parts of the central portion of the wheel.
  
[List of Patents for class 301 subclass 5.7]    5.7With antifriction bearing
 This subclass is indented under subclass 5.3.  Wheel having an antifriction bearing.
  
[List of Patents for class 301 subclass 6.1]    6.1With drive or brake attachment:
 This subclass is indented under subclass 5.1.  Wheel combined with an element (1) which transmits force to the wheel to effect movement thereof or (2) which receives force from the wheel to prevent movement thereof.

SEE OR SEARCH CLASS:

152Resilient Tires and Wheels,   subclass 153 for a cooling device for a resilient tire.
188Brakes,   for a brake for a wheel without "significant" recitation of a wheel. The combination of a "significant" brake with a "significant" wheel is included in this and the indented subclasses (301/6.1+).
  
[List of Patents for class 301 subclass 6.2]    6.2Aircraft wheel:
 This subclass is indented under subclass 6.1.  Wheel particularly adapted to use on an aircraft to support that aircraft while on the ground.
  
[List of Patents for class 301 subclass 6.3]    6.3And with brake-cooling means:
 This subclass is indented under subclass 6.1.  Wheel including provision to reduce the thermal level of the brake structure.
  
[List of Patents for class 301 subclass 6.4]    6.4Comprising means to utilize a fluid:
 This subclass is indented under subclass 6.3.  Wheel wherein the provision to reduce the thermal level uses a contained flowable medium such as a gas or liquid to carry heat away from the brake.
(1) Note. A cooling fin intended to transfer heat to passing air does not "contain" a flowable medium and, therefore, is not included herein.
  
[List of Patents for class 301 subclass 6.5]    6.5Drive means on wheel:
 This subclass is indented under subclass 6.1.  Wheel combined with an element which transmits force to the wheel to effect movement thereof.
  
[List of Patents for class 301 subclass 6.6]    6.6Wheel supported on brake drum clear of hub:
 This subclass is indented under subclass 6.1.  Wheel combined with a brake member intended to turn about the wheel axis, said member having a cylindrical friction surface thereon, which wheel is supported by the brake member without any other load-bearing attachment to the vehicle.
  
[List of Patents for class 301 subclass 6.7]    6.7Brake drum supported on wheel clear of hub:
 This subclass is indented under subclass 6.1.  Wheel combined with a brake member intended to turn about the wheel axis, said member having a cylindrical friction surface thereon, which brake member is supported by the wheel member without any other load-bearing attachment to the vehicle.
  
[List of Patents for class 301 subclass 6.8]    6.8Disc brake:
 This subclass is indented under subclass 6.1.  Wheel including a brake member intended to turn about the wheel axis, said member having an axially facing friction surface thereon.
  
[List of Patents for class 301 subclass 6.9]    6.9For cycle-type vehicle:
 This subclass is indented under subclass 6.1.  Wheel particularly adapted to use on a two or three wheel bicycle or motorcycle.
  
[List of Patents for class 301 subclass 6.91]    6.91Having vibration damper or heat insulator:
 This subclass is indented under subclass 6.1.  Wheel including (1) provision to eliminate regular, repetitive oscillations or (2) provision to prevent the transfer of heat.
  
[List of Patents for class 301 subclass 7]    7Wheelbarrow type
 This subclass is indented under subclass 5.1.  Wheel of the type usable on an ordinary wheelbarrow.
  
[List of Patents for class 301 subclass 8]    8Having auxiliary bracing
 This subclass is indented under subclass 5.1.  Wheel having structure in addition to that of a conventional wheel for reinforcing any component part at any point.
  
[List of Patents for class 301 subclass 9.1]    9.1Detachable wheel section:
 This subclass is indented under subclass 5.1.  Wheel having means whereby a substantial part of the wheel, e.g., not less than a demountable rim and tire, is removably secured to an inner part without removing the inner part from an attached position on the axle.
  
[List of Patents for class 301 subclass 9.2]    9.2With provision to permit positioning of rim laterally of hub:
 This subclass is indented under subclass 9.1.  Wheel with means to allow the rim to be held on the supporting structure (hub) in a first axial position or alternatively in a second axial position.
  
[List of Patents for class 301 subclass 10.1]    10.1Demountable rim:
 This subclass is indented under subclass 9.1.  Wheel wherein the detachable, substantial part comprises an annular member intended (1) to rollingly engage the ground or (2) to support a tire intended to rollingly engage the ground.
  
[List of Patents for class 301 subclass 11.1]    11.1Rim-securing means:
 This subclass is indented under subclass 10.1.  Wheel having means to attach the rim to the periphery of a wheel body.
  
[List of Patents for class 301 subclass 11.2]    11.2With lock between rim and wheel body:
 This subclass is indented under subclass 11.1.  Wheel combined with means distinct from the securing means to prevent separation of the rim and the wheel web.
  
[List of Patents for class 301 subclass 11.3]    11.3With spacer between rim and wheel body:
 This subclass is indented under subclass 11.1.  Wheel combined with means distinct from the securing means to fill clearance between the radially inner surface of the rim and the radially outer surface of the wheel web.
  
[List of Patents for class 301 subclass 12.1]    12.1Spoke secured:
 This subclass is indented under subclass 11.1.  Wheel wherein the rim is secured directly (i.e., without a separate felly) to the spokes of the wheel.
  
[List of Patents for class 301 subclass 12.2]    12.2Radially movable spoke:
 This subclass is indented under subclass 12.1.  Wheel wherein the securing means comprises a spoke with at least a portion thereof repositionable outwardly from the axis.
  
[List of Patents for class 301 subclass 13.1]    13.1Plural rims:
 This subclass is indented under subclass 11.1.  Wheel including more than one rim mounted on the wheel.

SEE OR SEARCH CLASS:

152Resilient Tires and Wheels,   subclass 376 for nondemountable plural rims each of which is particularly adapted for use with a resilient tire.
  
[List of Patents for class 301 subclass 13.2]    13.2Dual rims:
 This subclass is indented under subclass 13.1.  Wheel including more than one rim of substantially equal radial extent positioned near each other along the wheel axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

36.1,for dual wheels.
  
[List of Patents for class 301 subclass 14]    14Securing and removing means
 This subclass is indented under subclass 11.1.  Wheel wherein the means for securing the rim to the wheel can be operated to assist in removing the rim.
  
[List of Patents for class 301 subclass 15]    15Contractible rim
 This subclass is indented under subclass 11.1.  Wheel including a transplit rim, i.e., a rim of adjustable length so that the rim is secured to the wheel by contracting the rim about the periphery of the wheel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

30+,for a demountable, transversely divided rim without securing means, generally.
  
[List of Patents for class 301 subclass 16]    16Expandable wheel body
 This subclass is indented under subclass 11.1.  Wheel wherein the portion located radially inside the rim includes a component that is movable radially outwardly to engage and secure the rim thereon.
  
[List of Patents for class 301 subclass 17]    17Bayonet joint
 This subclass is indented under subclass 11.1.  Wheel wherein there is a bayonet-joint connection between the outer periphery of the wheel and the inner periphery of the rim.
  
[List of Patents for class 301 subclass 18]    18Radially acting wedge
 This subclass is indented under subclass 11.1.  Wheel wherein the rim is secured by a wedge operable to exert a radial pressure on the rim.
  
[List of Patents for class 301 subclass 19]    19Transversely extending wedge
 This subclass is indented under subclass 18.  Wheel wherein the wedging-surfaces extend along the axis of the wheel.
  
[List of Patents for class 301 subclass 20]    20Independently movable
 This subclass is indented under subclass 19.  Wheel wherein the wedge has movement discrete of that of both the rim and the wheel web.
  
[List of Patents for class 301 subclass 21]    21Bolt wedge
 This subclass is indented under subclass 20.  Wheel wherein the wedge comprises a tapered, helical member that is rotated about its axis to effect movement thereof along its axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

28,for a wheel having a demountable rim secured by a radially extending latch bolt.
  
[List of Patents for class 301 subclass 22]    22Annular wedge
 This subclass is indented under subclass 20.  Wheel wherein the wedge is in the form of a ring extending around the periphery of the wheel.
  
[List of Patents for class 301 subclass 23]    23Removable side ring
 This subclass is indented under subclass 11.1.  Wheel wherein the securing means comprises a removable side ring.

SEE OR SEARCH THIS CLASS, SUBCLASS:

22,for a ring shaped wheel rim securing means comprising a wedge.
  
[List of Patents for class 301 subclass 24]    24Removable side lug
 This subclass is indented under subclass 11.1.  Wheel wherein the securing means comprises a removable side lug.

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18+,for a wheel wherein the rim is secured by a wedge operable to exert radial pressure on the rim.
  
[List of Patents for class 301 subclass 25]    25Latch
 This subclass is indented under subclass 11.1.  Wheel wherein either the rim or the wheel-body carries a member capable of movement to lock the rim to the wheel-body.
  
[List of Patents for class 301 subclass 26]    26Annular latch
 This subclass is indented under subclass 25.  Wheel wherein the securing means comprises a ring secured to a wheel element by means such that the ring can be moved to two positions, one locking the rim in place and the other in a position to release it.
  
[List of Patents for class 301 subclass 27]    27Expandable ring
 This subclass is indented under subclass 26.  Wheel wherein the securing ring includes a portion that is movable radially outwardly to engage and secure the rim to the wheel body.
  
[List of Patents for class 301 subclass 28]    28Radially moving bolt
 This subclass is indented under subclass 25.  Wheel wherein the latch comprises a helically ribbed member positioned with its axis extending away from the wheel axis, such that upon rotation about its axis the member is caused to move away from the wheel axis and secure the rim to the wheel body.

SEE OR SEARCH THIS CLASS, SUBCLASS:

21,for wheel having a removable rim secured to the wheel body by a radially acting bolt wedge.
  
[List of Patents for class 301 subclass 29]    29Pivoted
 This subclass is indented under subclass 25.  Wheel wherein the latch is a pivoted element.
  
[List of Patents for class 301 subclass 29.2]    29.2Circumferentially divided rim:
 This subclass is indented under subclass 11.1.  Wheel having a demountable rim which is divided into plural axial sections, which rim is secured to the wheel body by bringing together the rim"s sections.
(1) Note. The structure of the rim is such that the sections can be separated only when there is no tire on the wheel.

SEE OR SEARCH CLASS:

152Resilient Tires and Wheels,   subclasses 396+ for rim parts which are particularly adapted for use with a resilient tire, which rim parts are separable to facilitate removal of the tire.
  
[List of Patents for class 301 subclass 30]    30Transversely divided
 This subclass is indented under subclass 9.1.  Wheel wherein the demountable rim or a section thereof is divided by a cut generally parallel to the wheel axis.
  
[List of Patents for class 301 subclass 30.2]    30.2One section both transversely and circumferentially divided:
 This subclass is indented under subclass 30.  Wheel having a demountable rim which is divided into plural axial sections, which rim is secured to the wheel body by bringing together the rim"s sections, wherein one axial section thereof is cut parallel to the wheel axis.
  
[List of Patents for class 301 subclass 31]    31Plural sections
 This subclass is indented under subclass 30.  Wheel wherein the rim is divided by a plurality of transverse cuts.
  
[List of Patents for class 301 subclass 32]    32Hinged
 This subclass is indented under subclass 31.  Wheel wherein two sections of the rim are pivotally attached to each other.

SEE OR SEARCH CLASS:

152Resilient Tires and Wheels,   subclass 377 for a rim particularly adapted to receive a resilient tire, which rim includes a retracting wheel section.
  
[List of Patents for class 301 subclass 33]    33With end-aligning means
 This subclass is indented under subclass 30.  Wheel wherein adjacent ends of the divided rim are provided with means for moving such ends into or out of aligned relation.

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157Wheelwright Machines,   subclasses 1.35+ for a rim-breaking device which is not part of the rim and is intended to be removed therefrom during normal use of the rim.
  
[List of Patents for class 301 subclass 34]    34Tool connection
 This subclass is indented under subclass 33.  Wheel wherein the adjacent ends of the rim are provided with tool-receiving means to be used to align the ends of the rim.
  
[List of Patents for class 301 subclass 35.1]    35.1Circumferentially divided rim:
 This subclass is indented under subclass 9.1.  Wheel having a demountable rim which is divided into plural axial sections, which rim is secured to the wheel body by bringing together the rim"s sections.
(1) Note. The structure of the rim is such that the sections can be separated only when there is no tire on the wheel.

SEE OR SEARCH CLASS:

152Resilient Tires and Wheels,   subclasses 396+ for rim parts which are particularly adapted for use with a resilient tire, which rim parts are separable to facilitate removal of the tire.
  
[List of Patents for class 301 subclass 35.2]    35.2Rim sections held together by bayonet joint:
 This subclass is indented under subclass 35.1.  Wheel wherein the axial sections are configured such that one is moved toward the other along the wheel axis, i.e., their axes, then rotated so that the sections interfit and cannot be separated without reversal of the movement.
  
[List of Patents for class 301 subclass 35.3]    35.3Rim sections held together by transversely divided locking ring:
 This subclass is indented under subclass 35.1.  Wheel wherein the axial sections are configured to interfit with an annular member so that they cannot be separated without removal of the annular member, wherein the annular member is divided by a cut generally parallel to the wheel axis.
  
[List of Patents for class 301 subclass 35.51]    35.51Including means to prevent relative rotation between rim and wheel body:
 This subclass is indented under subclass 10.1.  Wheel including structure adapted to interfit with the rim and the wheel web to secure the two members such that one will not turn about the wheel axis with respect to the other.
  
[List of Patents for class 301 subclass 35.52]    35.52Geared mounting mechanism:
 This subclass is indented under subclass 9.1.  Wheel wherein the detachable section comprises a toothed rotary member which is intended to be used to effect securement of the wheel on supporting structure, e.g., on an axle.
  
[List of Patents for class 301 subclass 35.53]    35.53Artillery wheel with single-acting retaining means:
 This subclass is indented under subclass 9.1.  Wheel which is particularly adapted to use in transporting ordnance and which includes a member for securing that wheel to supporting structure, such as an axle, by a single movement.
  
[List of Patents for class 301 subclass 35.54]    35.54Artillery wheel bolted to hub:
 This subclass is indented under subclass 9.1.  Wheel which is particularly adapted to use in transporting ordnance and which is configured to be secured to supporting structure, such as an axle, by a helically ribbed member interfitting with the supporting structure.
  
[List of Patents for class 301 subclass 35.55]    35.55By central nut:
 This subclass is indented under subclass 35.54.  Wheel wherein the helically ribbed member is concentric with the wheel axis.
  
[List of Patents for class 301 subclass 35.56]    35.56Wire-spoke wheel with single-acting mounting means:
 This subclass is indented under subclass 9.1.  Wheel having the hub joined to the rim by a plurality of generally radially extending slender rods and including a member for securing that wheel to supporting structure, such as an axle, by a single movement.
  
[List of Patents for class 301 subclass 35.57]    35.57Wire-spoke wheel bolted to hub:
 This subclass is indented under subclass 9.1.  Wheel having the hub joined to the rim by a plurality of generally radially extending rods and configured to be secured to supporting structure, such as an axle, by a helically ribbed member interfitting with the supporting structure.
  
[List of Patents for class 301 subclass 35.58]    35.58By central nut:
 This subclass is indented under subclass 35.57.  Wheel wherein the helically ribbed member is concentric with the wheel axis.
  
[List of Patents for class 301 subclass 35.59]    35.59Spoke formations bolted to hub:
 This subclass is indented under subclass 9.1.  Wheel having the hub joined to the rim by a member configured to appear to be a plurality of generally radially extending rods.
  
[List of Patents for class 301 subclass 35.61]    35.61Disc wheel with single-acting retaining means:
 This subclass is indented under subclass 9.1.  Wheel having the hub joined to the rim by a generally flat, radially extending platelike member and including a member for securing that wheel to supporting structure, such as an axle, by a single movement.
  
[List of Patents for class 301 subclass 35.621]    35.621Disc wheel bolted to hub:
 This subclass is indented under subclass 9.1.  Subject matter wherein the wheel having the hub joined to the rim by a generally flat, radially extending platelike member and configured to be secured to a supporting structure, such as an axle, by a threaded fastener interfitting with the supporting structure (i.e., a bolt).

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411Expanded, Threaded, Driven, Headed, Tool-deformed, or Locked-threaded Fastener,   appropriate subclasses for specific nut or bolt structure.
  
[List of Patents for class 301 subclass 35.622]    35.622Multi-part nut:
 This subclass is indented under subclass 35.621.  Subject matter includes a plurality of members having threaded holes designed to fit around and secure the bolt.