| ReturnTo Theme-Group-Choice | Onelevelup |
| 3B091 | Chairs characterized by structure | |
| A47C3/00 -3/40 | ||
| A47C3/02-3/03 | AA | AA00 FRAME SHAPES |
AA01 | AA02 | AA03 | AA04 | AA05 | AA06 | AA07 | |||
| . Flexible frames | . . Frames made of tubular materials | . Fixed frames | . . Types with center posts | . . Curved rocking members between seats and frames | . . Variants with a seat suspended on a frame | . Curved rocking members that make direct contact with the floor | ||||||
| AB | AB00 ROCKING FORMS |
AB01 | AB02 | AB03 | AB04 | AB05 | ||||||
| . Seats only | . Backrests only | . Seats and backrests that are locked together | . . Variants that use linking mechanisms | . Leg parts | ||||||||
| AC | AC00 ROCKING DEVICES |
AC01 | AC02 | AC03 | AC04 | AC05 | AC06 | AC07 | AC08 | AC09 | ||
| . Electrically powered types | . . Variants that use cranks | . Magnetic types | . Spring types | . . Coil springs | . . Flat springs | . . Torsion springs (i.e., torsion bars) | . . Rubber | . Other devices | ||||
| AD | AD00 DEVICES TO ADJUST ROCKING |
AD01 | AD02 | AD03 | ||||||||
| . Adjustable angle of tilt | . Rocking range that can be restricted | . . Devices to stop rocking | ||||||||||
| A47C3/04 | BA | BA00 STACKING CHAIRS |
BA01 | BA02 | BA03 | BA04 | ||||||
| . Vertical axis types | . Oblique axis types | . Rotary axis types | . Horizontal axis types | |||||||||
| A47C3/16 | CA | CA00 CHAIRS WITHOUT LEGS |
CA01 | CA02 | CA03 | CA04 | CA05 | CA06 | CA07 | CA08 | CA09 | CA10 |
| . Characteristic seat parts | . . Rotatable seat parts | . . Seat parts that can move forward and backward | . Characteristic backrest parts | . . Backrest parts with members that touch the hips | . Characteristic armrests or headrests | . Variants that allow reclining | . . Reclining mechanisms | . . Rocking mechanisms | . Convertible to other items | |||
| CA11 | CA12 | CA13 | CA14 | CA15 | CA16 | CA17 | CA18 | CA19 | ||||
| . . Upright chairs | . . Couches | . . Detachable legs | . Accessories | . . Heating devices | . . . Built-in types | . . Massagers | . . Compartments for small articles, or tables | . . Devices to prevent sliding or seat movement | ||||
| A47C3/18@A | DA | DA00 ROTATING CHAIRS THAT HAVE AUTO-RETURN MECHANISMS |
DA01 | DA02 | DA03 | DA04 | DA05 | |||||
| . Springs | . . Helical springs | . . Rubber | . Eccentric cams | . Cams that have inclined guide surfaces | ||||||||
| A47C3/18@B;3/18@Z | EA | EA00 GUIDE STRUCTURES |
EA01 | EA02 | EA03 | EA04 | ||||||
| . Rotary supports | . . Seats are supported on projecting parts on the top ends of supports | . Variants that use rotary pieces that absorb axial load | . Variants that use ring-shaped or arcuate rails | |||||||||
| EB | EB00 COMBINATIONS WITH OTHER FUNCTIONS |
EB01 | EB02 | EB03 | EB04 | EB05 | ||||||
| . Height adjustment | . Seat parts move forward and backward | . Cushioning mechanisms | . Mechanisms to prevent the chair's coming apart | . Other functions | ||||||||
| EC | EC00 ROTARY LOCKING MECHANISMS |
EC01 | EC02 | EC03 | EC04 | |||||||
| . Locking that is not in steps | . Axis of the locking pawls that moves vertically | . Axis of the locking pawl that moves horizontally | . Locking pawls that turn | |||||||||
| A47C3/20 | GA | GA00 CHAIRS WHOSE HEIGHT IS ADJUSTABLE |
GA01 | GA02 | GA03 | GA04 | GA05 | |||||
| . Linking | . . Adjustable height of the front or back of the seat part | . Fastening sections as characteristics | . . Variants that use friction | . . Variants that use hooks | ||||||||
| A47C3/22 | HA | HA00 VARIANTS THAT HAVE BALANCING DEVICES |
HA01 | HA02 | ||||||||
| . Characteristic use of springs | . Variants whose purpose is cushioning action | |||||||||||
| A47C3/24 | JA | JA00 VARIANTS THAT HAVE VERTICAL THREADED SHAFTS |
JA01 | JA02 | JA03 | JA04 | ||||||
| . Variants that are adjusted by rotating the seat | . . Variants whose height is not changed by rotating when the seat is occupied | . Variants that are adjustable without rotating the seat | . Electrically powered types | |||||||||
| A47C3/28 | KA | KA00 VARIANTS THAT HAVE CLAMPS THAT ACT ON VERTICAL SHAFTS |
KA01 | KA02 | KA03 | KA04 | KA05 | |||||
| . Nut types | . Insertion types | . Pressing of an inner tube by a threaded shaft's entry | . Cam levers | . Variants that use rollers or balls | ||||||||
| A47C3/30 | LA | LA00 VARIANTS THAT HAVE FLUID CYLINDERS WITH VERTICAL ACTION |
LA01 | LA02 | LA03 | LA04 | LA05 | |||||
| . Fluid cylinder structures | . Mounting on chairs | . Variants associated with other functions | . Operating handles | . Operating pedals | ||||||||
| A47C3/34 | MA | MA00 BEING PINS THAT ACT TOGETHER WITH HOLES |
MA01 | MA02 | MA03 | MA04 | MA05 | |||||
| . Through-holes | . . Pins subjected to force | . . Pins that are are threaded shafts | . Depression-like holes | . Comb-like holes | ||||||||
| A47C3/36 | NA | NA00 VARIANTS WHOSE LEG PARTS TILT |
NA01 | NA02 | NA03 | NA04 | ||||||
| . Cross-linking | . . Threaded shafts | . . Notches and pins | . Parallel linking |